+++ /dev/null
-/*
- * Copyright 2012 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/sched.h>
-#include <linux/kernel.h> /* printk() */
-#include <linux/slab.h> /* kmalloc() */
-#include <linux/errno.h> /* error codes */
-#include <linux/types.h> /* size_t */
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/irq.h>
-#include <linux/netdevice.h> /* struct device, and other headers */
-#include <linux/etherdevice.h> /* eth_type_trans */
-#include <linux/skbuff.h>
-#include <linux/ioctl.h>
-#include <linux/cdev.h>
-#include <linux/hugetlb.h>
-#include <linux/in6.h>
-#include <linux/timer.h>
-#include <linux/hrtimer.h>
-#include <linux/ktime.h>
-#include <linux/io.h>
-#include <linux/ctype.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/tcp.h>
-#include <linux/net_tstamp.h>
-#include <linux/ptp_clock_kernel.h>
-#include <linux/sched/isolation.h>
-
-#include <asm/checksum.h>
-#include <asm/homecache.h>
-#include <gxio/mpipe.h>
-#include <arch/sim.h>
-
-/* Default transmit lockup timeout period, in jiffies. */
-#define TILE_NET_TIMEOUT (5 * HZ)
-
-/* The maximum number of distinct channels (idesc.channel is 5 bits). */
-#define TILE_NET_CHANNELS 32
-
-/* Maximum number of idescs to handle per "poll". */
-#define TILE_NET_BATCH 128
-
-/* Maximum number of packets to handle per "poll". */
-#define TILE_NET_WEIGHT 64
-
-/* Maximum Jumbo Packet MTU */
-#define TILE_JUMBO_MAX_MTU 9000
-
-/* Number of entries in each iqueue. */
-#define IQUEUE_ENTRIES 512
-
-/* Number of entries in each equeue. */
-#define EQUEUE_ENTRIES 2048
-
-/* Total header bytes per equeue slot. Must be big enough for 2 bytes
- * of NET_IP_ALIGN alignment, plus 14 bytes (?) of L2 header, plus up to
- * 60 bytes of actual TCP header. We round up to align to cache lines.
- */
-#define HEADER_BYTES 128
-
-/* Maximum completions per cpu per device (must be a power of two).
- * ISSUE: What is the right number here? If this is too small, then
- * egress might block waiting for free space in a completions array.
- * ISSUE: At the least, allocate these only for initialized echannels.
- */
-#define TILE_NET_MAX_COMPS 64
-
-#define MAX_FRAGS (MAX_SKB_FRAGS + 1)
-
-/* The "kinds" of buffer stacks (small/large/jumbo). */
-#define MAX_KINDS 3
-
-/* Size of completions data to allocate.
- * ISSUE: Probably more than needed since we don't use all the channels.
- */
-#define COMPS_SIZE (TILE_NET_CHANNELS * sizeof(struct tile_net_comps))
-
-/* Size of NotifRing data to allocate. */
-#define NOTIF_RING_SIZE (IQUEUE_ENTRIES * sizeof(gxio_mpipe_idesc_t))
-
-/* Timeout to wake the per-device TX timer after we stop the queue.
- * We don't want the timeout too short (adds overhead, and might end
- * up causing stop/wake/stop/wake cycles) or too long (affects performance).
- * For the 10 Gb NIC, 30 usec means roughly 30+ 1500-byte packets.
- */
-#define TX_TIMER_DELAY_USEC 30
-
-/* Timeout to wake the per-cpu egress timer to free completions. */
-#define EGRESS_TIMER_DELAY_USEC 1000
-
-MODULE_AUTHOR("Tilera Corporation");
-MODULE_LICENSE("GPL");
-
-/* A "packet fragment" (a chunk of memory). */
-struct frag {
- void *buf;
- size_t length;
-};
-
-/* A single completion. */
-struct tile_net_comp {
- /* The "complete_count" when the completion will be complete. */
- s64 when;
- /* The buffer to be freed when the completion is complete. */
- struct sk_buff *skb;
-};
-
-/* The completions for a given cpu and echannel. */
-struct tile_net_comps {
- /* The completions. */
- struct tile_net_comp comp_queue[TILE_NET_MAX_COMPS];
- /* The number of completions used. */
- unsigned long comp_next;
- /* The number of completions freed. */
- unsigned long comp_last;
-};
-
-/* The transmit wake timer for a given cpu and echannel. */
-struct tile_net_tx_wake {
- int tx_queue_idx;
- struct hrtimer timer;
- struct net_device *dev;
-};
-
-/* Info for a specific cpu. */
-struct tile_net_info {
- /* Our cpu. */
- int my_cpu;
- /* A timer for handling egress completions. */
- struct hrtimer egress_timer;
- /* True if "egress_timer" is scheduled. */
- bool egress_timer_scheduled;
- struct info_mpipe {
- /* Packet queue. */
- gxio_mpipe_iqueue_t iqueue;
- /* The NAPI struct. */
- struct napi_struct napi;
- /* Number of buffers (by kind) which must still be provided. */
- unsigned int num_needed_buffers[MAX_KINDS];
- /* instance id. */
- int instance;
- /* True if iqueue is valid. */
- bool has_iqueue;
- /* NAPI flags. */
- bool napi_added;
- bool napi_enabled;
- /* Comps for each egress channel. */
- struct tile_net_comps *comps_for_echannel[TILE_NET_CHANNELS];
- /* Transmit wake timer for each egress channel. */
- struct tile_net_tx_wake tx_wake[TILE_NET_CHANNELS];
- } mpipe[NR_MPIPE_MAX];
-};
-
-/* Info for egress on a particular egress channel. */
-struct tile_net_egress {
- /* The "equeue". */
- gxio_mpipe_equeue_t *equeue;
- /* The headers for TSO. */
- unsigned char *headers;
-};
-
-/* Info for a specific device. */
-struct tile_net_priv {
- /* Our network device. */
- struct net_device *dev;
- /* The primary link. */
- gxio_mpipe_link_t link;
- /* The primary channel, if open, else -1. */
- int channel;
- /* The "loopify" egress link, if needed. */
- gxio_mpipe_link_t loopify_link;
- /* The "loopify" egress channel, if open, else -1. */
- int loopify_channel;
- /* The egress channel (channel or loopify_channel). */
- int echannel;
- /* mPIPE instance, 0 or 1. */
- int instance;
- /* The timestamp config. */
- struct hwtstamp_config stamp_cfg;
-};
-
-static struct mpipe_data {
- /* The ingress irq. */
- int ingress_irq;
-
- /* The "context" for all devices. */
- gxio_mpipe_context_t context;
-
- /* Egress info, indexed by "priv->echannel"
- * (lazily created as needed).
- */
- struct tile_net_egress
- egress_for_echannel[TILE_NET_CHANNELS];
-
- /* Devices currently associated with each channel.
- * NOTE: The array entry can become NULL after ifconfig down, but
- * we do not free the underlying net_device structures, so it is
- * safe to use a pointer after reading it from this array.
- */
- struct net_device
- *tile_net_devs_for_channel[TILE_NET_CHANNELS];
-
- /* The actual memory allocated for the buffer stacks. */
- void *buffer_stack_vas[MAX_KINDS];
-
- /* The amount of memory allocated for each buffer stack. */
- size_t buffer_stack_bytes[MAX_KINDS];
-
- /* The first buffer stack index
- * (small = +0, large = +1, jumbo = +2).
- */
- int first_buffer_stack;
-
- /* The buckets. */
- int first_bucket;
- int num_buckets;
-
- /* PTP-specific data. */
- struct ptp_clock *ptp_clock;
- struct ptp_clock_info caps;
-
- /* Lock for ptp accessors. */
- struct mutex ptp_lock;
-
-} mpipe_data[NR_MPIPE_MAX] = {
- [0 ... (NR_MPIPE_MAX - 1)] {
- .ingress_irq = -1,
- .first_buffer_stack = -1,
- .first_bucket = -1,
- .num_buckets = 1
- }
-};
-
-/* A mutex for "tile_net_devs_for_channel". */
-static DEFINE_MUTEX(tile_net_devs_for_channel_mutex);
-
-/* The per-cpu info. */
-static DEFINE_PER_CPU(struct tile_net_info, per_cpu_info);
-
-
-/* The buffer size enums for each buffer stack.
- * See arch/tile/include/gxio/mpipe.h for the set of possible values.
- * We avoid the "10384" size because it can induce "false chaining"
- * on "cut-through" jumbo packets.
- */
-static gxio_mpipe_buffer_size_enum_t buffer_size_enums[MAX_KINDS] = {
- GXIO_MPIPE_BUFFER_SIZE_128,
- GXIO_MPIPE_BUFFER_SIZE_1664,
- GXIO_MPIPE_BUFFER_SIZE_16384
-};
-
-/* Text value of tile_net.cpus if passed as a module parameter. */
-static char *network_cpus_string;
-
-/* The actual cpus in "network_cpus". */
-static struct cpumask network_cpus_map;
-
-/* If "tile_net.loopify=LINK" was specified, this is "LINK". */
-static char *loopify_link_name;
-
-/* If "tile_net.custom" was specified, this is true. */
-static bool custom_flag;
-
-/* If "tile_net.jumbo=NUM" was specified, this is "NUM". */
-static uint jumbo_num;
-
-/* Obtain mpipe instance from struct tile_net_priv given struct net_device. */
-static inline int mpipe_instance(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- return priv->instance;
-}
-
-/* The "tile_net.cpus" argument specifies the cpus that are dedicated
- * to handle ingress packets.
- *
- * The parameter should be in the form "tile_net.cpus=m-n[,x-y]", where
- * m, n, x, y are integer numbers that represent the cpus that can be
- * neither a dedicated cpu nor a dataplane cpu.
- */
-static bool network_cpus_init(void)
-{
- int rc;
-
- if (network_cpus_string == NULL)
- return false;
-
- rc = cpulist_parse_crop(network_cpus_string, &network_cpus_map);
- if (rc != 0) {
- pr_warn("tile_net.cpus=%s: malformed cpu list\n",
- network_cpus_string);
- return false;
- }
-
- /* Remove dedicated cpus. */
- cpumask_and(&network_cpus_map, &network_cpus_map, cpu_possible_mask);
-
- if (cpumask_empty(&network_cpus_map)) {
- pr_warn("Ignoring empty tile_net.cpus='%s'.\n",
- network_cpus_string);
- return false;
- }
-
- pr_info("Linux network CPUs: %*pbl\n",
- cpumask_pr_args(&network_cpus_map));
- return true;
-}
-
-module_param_named(cpus, network_cpus_string, charp, 0444);
-MODULE_PARM_DESC(cpus, "cpulist of cores that handle network interrupts");
-
-/* The "tile_net.loopify=LINK" argument causes the named device to
- * actually use "loop0" for ingress, and "loop1" for egress. This
- * allows an app to sit between the actual link and linux, passing
- * (some) packets along to linux, and forwarding (some) packets sent
- * out by linux.
- */
-module_param_named(loopify, loopify_link_name, charp, 0444);
-MODULE_PARM_DESC(loopify, "name the device to use loop0/1 for ingress/egress");
-
-/* The "tile_net.custom" argument causes us to ignore the "conventional"
- * classifier metadata, in particular, the "l2_offset".
- */
-module_param_named(custom, custom_flag, bool, 0444);
-MODULE_PARM_DESC(custom, "indicates a (heavily) customized classifier");
-
-/* The "tile_net.jumbo" argument causes us to support "jumbo" packets,
- * and to allocate the given number of "jumbo" buffers.
- */
-module_param_named(jumbo, jumbo_num, uint, 0444);
-MODULE_PARM_DESC(jumbo, "the number of buffers to support jumbo packets");
-
-/* Atomically update a statistics field.
- * Note that on TILE-Gx, this operation is fire-and-forget on the
- * issuing core (single-cycle dispatch) and takes only a few cycles
- * longer than a regular store when the request reaches the home cache.
- * No expensive bus management overhead is required.
- */
-static void tile_net_stats_add(unsigned long value, unsigned long *field)
-{
- BUILD_BUG_ON(sizeof(atomic_long_t) != sizeof(unsigned long));
- atomic_long_add(value, (atomic_long_t *)field);
-}
-
-/* Allocate and push a buffer. */
-static bool tile_net_provide_buffer(int instance, int kind)
-{
- struct mpipe_data *md = &mpipe_data[instance];
- gxio_mpipe_buffer_size_enum_t bse = buffer_size_enums[kind];
- size_t bs = gxio_mpipe_buffer_size_enum_to_buffer_size(bse);
- const unsigned long buffer_alignment = 128;
- struct sk_buff *skb;
- int len;
-
- len = sizeof(struct sk_buff **) + buffer_alignment + bs;
- skb = dev_alloc_skb(len);
- if (skb == NULL)
- return false;
-
- /* Make room for a back-pointer to 'skb' and guarantee alignment. */
- skb_reserve(skb, sizeof(struct sk_buff **));
- skb_reserve(skb, -(long)skb->data & (buffer_alignment - 1));
-
- /* Save a back-pointer to 'skb'. */
- *(struct sk_buff **)(skb->data - sizeof(struct sk_buff **)) = skb;
-
- /* Make sure "skb" and the back-pointer have been flushed. */
- wmb();
-
- gxio_mpipe_push_buffer(&md->context, md->first_buffer_stack + kind,
- (void *)va_to_tile_io_addr(skb->data));
-
- return true;
-}
-
-/* Convert a raw mpipe buffer to its matching skb pointer. */
-static struct sk_buff *mpipe_buf_to_skb(void *va)
-{
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- /* Paranoia. */
- if (skb->data != va) {
- /* Panic here since there's a reasonable chance
- * that corrupt buffers means generic memory
- * corruption, with unpredictable system effects.
- */
- panic("Corrupt linux buffer! va=%p, skb=%p, skb->data=%p",
- va, skb, skb->data);
- }
-
- return skb;
-}
-
-static void tile_net_pop_all_buffers(int instance, int stack)
-{
- struct mpipe_data *md = &mpipe_data[instance];
-
- for (;;) {
- tile_io_addr_t addr =
- (tile_io_addr_t)gxio_mpipe_pop_buffer(&md->context,
- stack);
- if (addr == 0)
- break;
- dev_kfree_skb_irq(mpipe_buf_to_skb(tile_io_addr_to_va(addr)));
- }
-}
-
-/* Provide linux buffers to mPIPE. */
-static void tile_net_provide_needed_buffers(void)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- int instance, kind;
- for (instance = 0; instance < NR_MPIPE_MAX &&
- info->mpipe[instance].has_iqueue; instance++) {
- for (kind = 0; kind < MAX_KINDS; kind++) {
- while (info->mpipe[instance].num_needed_buffers[kind]
- != 0) {
- if (!tile_net_provide_buffer(instance, kind)) {
- pr_notice("Tile %d still needs"
- " some buffers\n",
- info->my_cpu);
- return;
- }
- info->mpipe[instance].
- num_needed_buffers[kind]--;
- }
- }
- }
-}
-
-/* Get RX timestamp, and store it in the skb. */
-static void tile_rx_timestamp(struct tile_net_priv *priv, struct sk_buff *skb,
- gxio_mpipe_idesc_t *idesc)
-{
- if (unlikely(priv->stamp_cfg.rx_filter != HWTSTAMP_FILTER_NONE)) {
- struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
- memset(shhwtstamps, 0, sizeof(*shhwtstamps));
- shhwtstamps->hwtstamp = ktime_set(idesc->time_stamp_sec,
- idesc->time_stamp_ns);
- }
-}
-
-/* Get TX timestamp, and store it in the skb. */
-static void tile_tx_timestamp(struct sk_buff *skb, int instance)
-{
- struct skb_shared_info *shtx = skb_shinfo(skb);
- if (unlikely((shtx->tx_flags & SKBTX_HW_TSTAMP) != 0)) {
- struct mpipe_data *md = &mpipe_data[instance];
- struct skb_shared_hwtstamps shhwtstamps;
- struct timespec64 ts;
-
- shtx->tx_flags |= SKBTX_IN_PROGRESS;
- gxio_mpipe_get_timestamp(&md->context, &ts);
- memset(&shhwtstamps, 0, sizeof(shhwtstamps));
- shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
- skb_tstamp_tx(skb, &shhwtstamps);
- }
-}
-
-/* Use ioctl() to enable or disable TX or RX timestamping. */
-static int tile_hwtstamp_set(struct net_device *dev, struct ifreq *rq)
-{
- struct hwtstamp_config config;
- struct tile_net_priv *priv = netdev_priv(dev);
-
- if (copy_from_user(&config, rq->ifr_data, sizeof(config)))
- return -EFAULT;
-
- if (config.flags) /* reserved for future extensions */
- return -EINVAL;
-
- switch (config.tx_type) {
- case HWTSTAMP_TX_OFF:
- case HWTSTAMP_TX_ON:
- break;
- default:
- return -ERANGE;
- }
-
- switch (config.rx_filter) {
- case HWTSTAMP_FILTER_NONE:
- break;
- case HWTSTAMP_FILTER_ALL:
- case HWTSTAMP_FILTER_SOME:
- case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
- case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
- case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
- case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
- case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
- case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
- case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
- case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
- case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
- case HWTSTAMP_FILTER_PTP_V2_EVENT:
- case HWTSTAMP_FILTER_PTP_V2_SYNC:
- case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
- case HWTSTAMP_FILTER_NTP_ALL:
- config.rx_filter = HWTSTAMP_FILTER_ALL;
- break;
- default:
- return -ERANGE;
- }
-
- if (copy_to_user(rq->ifr_data, &config, sizeof(config)))
- return -EFAULT;
-
- priv->stamp_cfg = config;
- return 0;
-}
-
-static int tile_hwtstamp_get(struct net_device *dev, struct ifreq *rq)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- if (copy_to_user(rq->ifr_data, &priv->stamp_cfg,
- sizeof(priv->stamp_cfg)))
- return -EFAULT;
-
- return 0;
-}
-
-static inline bool filter_packet(struct net_device *dev, void *buf)
-{
- /* Filter packets received before we're up. */
- if (dev == NULL || !(dev->flags & IFF_UP))
- return true;
-
- /* Filter out packets that aren't for us. */
- if (!(dev->flags & IFF_PROMISC) &&
- !is_multicast_ether_addr(buf) &&
- !ether_addr_equal(dev->dev_addr, buf))
- return true;
-
- return false;
-}
-
-static void tile_net_receive_skb(struct net_device *dev, struct sk_buff *skb,
- gxio_mpipe_idesc_t *idesc, unsigned long len)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- struct tile_net_priv *priv = netdev_priv(dev);
- int instance = priv->instance;
-
- /* Encode the actual packet length. */
- skb_put(skb, len);
-
- skb->protocol = eth_type_trans(skb, dev);
-
- /* Acknowledge "good" hardware checksums. */
- if (idesc->cs && idesc->csum_seed_val == 0xFFFF)
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- /* Get RX timestamp from idesc. */
- tile_rx_timestamp(priv, skb, idesc);
-
- napi_gro_receive(&info->mpipe[instance].napi, skb);
-
- /* Update stats. */
- tile_net_stats_add(1, &dev->stats.rx_packets);
- tile_net_stats_add(len, &dev->stats.rx_bytes);
-
- /* Need a new buffer. */
- if (idesc->size == buffer_size_enums[0])
- info->mpipe[instance].num_needed_buffers[0]++;
- else if (idesc->size == buffer_size_enums[1])
- info->mpipe[instance].num_needed_buffers[1]++;
- else
- info->mpipe[instance].num_needed_buffers[2]++;
-}
-
-/* Handle a packet. Return true if "processed", false if "filtered". */
-static bool tile_net_handle_packet(int instance, gxio_mpipe_idesc_t *idesc)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- struct mpipe_data *md = &mpipe_data[instance];
- struct net_device *dev = md->tile_net_devs_for_channel[idesc->channel];
- uint8_t l2_offset;
- void *va;
- void *buf;
- unsigned long len;
- bool filter;
-
- /* Drop packets for which no buffer was available (which can
- * happen under heavy load), or for which the me/tr/ce flags
- * are set (which can happen for jumbo cut-through packets,
- * or with a customized classifier).
- */
- if (idesc->be || idesc->me || idesc->tr || idesc->ce) {
- if (dev)
- tile_net_stats_add(1, &dev->stats.rx_errors);
- goto drop;
- }
-
- /* Get the "l2_offset", if allowed. */
- l2_offset = custom_flag ? 0 : gxio_mpipe_idesc_get_l2_offset(idesc);
-
- /* Get the VA (including NET_IP_ALIGN bytes of "headroom"). */
- va = tile_io_addr_to_va((unsigned long)idesc->va);
-
- /* Get the actual packet start/length. */
- buf = va + l2_offset;
- len = idesc->l2_size - l2_offset;
-
- /* Point "va" at the raw buffer. */
- va -= NET_IP_ALIGN;
-
- filter = filter_packet(dev, buf);
- if (filter) {
- if (dev)
- tile_net_stats_add(1, &dev->stats.rx_dropped);
-drop:
- gxio_mpipe_iqueue_drop(&info->mpipe[instance].iqueue, idesc);
- } else {
- struct sk_buff *skb = mpipe_buf_to_skb(va);
-
- /* Skip headroom, and any custom header. */
- skb_reserve(skb, NET_IP_ALIGN + l2_offset);
-
- tile_net_receive_skb(dev, skb, idesc, len);
- }
-
- gxio_mpipe_iqueue_consume(&info->mpipe[instance].iqueue, idesc);
- return !filter;
-}
-
-/* Handle some packets for the current CPU.
- *
- * This function handles up to TILE_NET_BATCH idescs per call.
- *
- * ISSUE: Since we do not provide new buffers until this function is
- * complete, we must initially provide enough buffers for each network
- * cpu to fill its iqueue and also its batched idescs.
- *
- * ISSUE: The "rotting packet" race condition occurs if a packet
- * arrives after the queue appears to be empty, and before the
- * hypervisor interrupt is re-enabled.
- */
-static int tile_net_poll(struct napi_struct *napi, int budget)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- unsigned int work = 0;
- gxio_mpipe_idesc_t *idesc;
- int instance, i, n;
- struct mpipe_data *md;
- struct info_mpipe *info_mpipe =
- container_of(napi, struct info_mpipe, napi);
-
- if (budget <= 0)
- goto done;
-
- instance = info_mpipe->instance;
- while ((n = gxio_mpipe_iqueue_try_peek(
- &info_mpipe->iqueue,
- &idesc)) > 0) {
- for (i = 0; i < n; i++) {
- if (i == TILE_NET_BATCH)
- goto done;
- if (tile_net_handle_packet(instance,
- idesc + i)) {
- if (++work >= budget)
- goto done;
- }
- }
- }
-
- /* There are no packets left. */
- napi_complete_done(&info_mpipe->napi, work);
-
- md = &mpipe_data[instance];
- /* Re-enable hypervisor interrupts. */
- gxio_mpipe_enable_notif_ring_interrupt(
- &md->context, info->mpipe[instance].iqueue.ring);
-
- /* HACK: Avoid the "rotting packet" problem. */
- if (gxio_mpipe_iqueue_try_peek(&info_mpipe->iqueue, &idesc) > 0)
- napi_schedule(&info_mpipe->napi);
-
- /* ISSUE: Handle completions? */
-
-done:
- tile_net_provide_needed_buffers();
-
- return work;
-}
-
-/* Handle an ingress interrupt from an instance on the current cpu. */
-static irqreturn_t tile_net_handle_ingress_irq(int irq, void *id)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- napi_schedule(&info->mpipe[(uint64_t)id].napi);
- return IRQ_HANDLED;
-}
-
-/* Free some completions. This must be called with interrupts blocked. */
-static int tile_net_free_comps(gxio_mpipe_equeue_t *equeue,
- struct tile_net_comps *comps,
- int limit, bool force_update)
-{
- int n = 0;
- while (comps->comp_last < comps->comp_next) {
- unsigned int cid = comps->comp_last % TILE_NET_MAX_COMPS;
- struct tile_net_comp *comp = &comps->comp_queue[cid];
- if (!gxio_mpipe_equeue_is_complete(equeue, comp->when,
- force_update || n == 0))
- break;
- dev_kfree_skb_irq(comp->skb);
- comps->comp_last++;
- if (++n == limit)
- break;
- }
- return n;
-}
-
-/* Add a completion. This must be called with interrupts blocked.
- * tile_net_equeue_try_reserve() will have ensured a free completion entry.
- */
-static void add_comp(gxio_mpipe_equeue_t *equeue,
- struct tile_net_comps *comps,
- uint64_t when, struct sk_buff *skb)
-{
- int cid = comps->comp_next % TILE_NET_MAX_COMPS;
- comps->comp_queue[cid].when = when;
- comps->comp_queue[cid].skb = skb;
- comps->comp_next++;
-}
-
-static void tile_net_schedule_tx_wake_timer(struct net_device *dev,
- int tx_queue_idx)
-{
- struct tile_net_info *info = &per_cpu(per_cpu_info, tx_queue_idx);
- struct tile_net_priv *priv = netdev_priv(dev);
- int instance = priv->instance;
- struct tile_net_tx_wake *tx_wake =
- &info->mpipe[instance].tx_wake[priv->echannel];
-
- hrtimer_start(&tx_wake->timer,
- TX_TIMER_DELAY_USEC * 1000UL,
- HRTIMER_MODE_REL_PINNED);
-}
-
-static enum hrtimer_restart tile_net_handle_tx_wake_timer(struct hrtimer *t)
-{
- struct tile_net_tx_wake *tx_wake =
- container_of(t, struct tile_net_tx_wake, timer);
- netif_wake_subqueue(tx_wake->dev, tx_wake->tx_queue_idx);
- return HRTIMER_NORESTART;
-}
-
-/* Make sure the egress timer is scheduled. */
-static void tile_net_schedule_egress_timer(void)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
-
- if (!info->egress_timer_scheduled) {
- hrtimer_start(&info->egress_timer,
- EGRESS_TIMER_DELAY_USEC * 1000UL,
- HRTIMER_MODE_REL_PINNED);
- info->egress_timer_scheduled = true;
- }
-}
-
-/* The "function" for "info->egress_timer".
- *
- * This timer will reschedule itself as long as there are any pending
- * completions expected for this tile.
- */
-static enum hrtimer_restart tile_net_handle_egress_timer(struct hrtimer *t)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- unsigned long irqflags;
- bool pending = false;
- int i, instance;
-
- local_irq_save(irqflags);
-
- /* The timer is no longer scheduled. */
- info->egress_timer_scheduled = false;
-
- /* Free all possible comps for this tile. */
- for (instance = 0; instance < NR_MPIPE_MAX &&
- info->mpipe[instance].has_iqueue; instance++) {
- for (i = 0; i < TILE_NET_CHANNELS; i++) {
- struct tile_net_egress *egress =
- &mpipe_data[instance].egress_for_echannel[i];
- struct tile_net_comps *comps =
- info->mpipe[instance].comps_for_echannel[i];
- if (!egress || comps->comp_last >= comps->comp_next)
- continue;
- tile_net_free_comps(egress->equeue, comps, -1, true);
- pending = pending ||
- (comps->comp_last < comps->comp_next);
- }
- }
-
- /* Reschedule timer if needed. */
- if (pending)
- tile_net_schedule_egress_timer();
-
- local_irq_restore(irqflags);
-
- return HRTIMER_NORESTART;
-}
-
-/* PTP clock operations. */
-
-static int ptp_mpipe_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
-{
- int ret = 0;
- struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
- mutex_lock(&md->ptp_lock);
- if (gxio_mpipe_adjust_timestamp_freq(&md->context, ppb))
- ret = -EINVAL;
- mutex_unlock(&md->ptp_lock);
- return ret;
-}
-
-static int ptp_mpipe_adjtime(struct ptp_clock_info *ptp, s64 delta)
-{
- int ret = 0;
- struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
- mutex_lock(&md->ptp_lock);
- if (gxio_mpipe_adjust_timestamp(&md->context, delta))
- ret = -EBUSY;
- mutex_unlock(&md->ptp_lock);
- return ret;
-}
-
-static int ptp_mpipe_gettime(struct ptp_clock_info *ptp,
- struct timespec64 *ts)
-{
- int ret = 0;
- struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
- mutex_lock(&md->ptp_lock);
- if (gxio_mpipe_get_timestamp(&md->context, ts))
- ret = -EBUSY;
- mutex_unlock(&md->ptp_lock);
- return ret;
-}
-
-static int ptp_mpipe_settime(struct ptp_clock_info *ptp,
- const struct timespec64 *ts)
-{
- int ret = 0;
- struct mpipe_data *md = container_of(ptp, struct mpipe_data, caps);
- mutex_lock(&md->ptp_lock);
- if (gxio_mpipe_set_timestamp(&md->context, ts))
- ret = -EBUSY;
- mutex_unlock(&md->ptp_lock);
- return ret;
-}
-
-static int ptp_mpipe_enable(struct ptp_clock_info *ptp,
- struct ptp_clock_request *request, int on)
-{
- return -EOPNOTSUPP;
-}
-
-static const struct ptp_clock_info ptp_mpipe_caps = {
- .owner = THIS_MODULE,
- .name = "mPIPE clock",
- .max_adj = 999999999,
- .n_ext_ts = 0,
- .n_pins = 0,
- .pps = 0,
- .adjfreq = ptp_mpipe_adjfreq,
- .adjtime = ptp_mpipe_adjtime,
- .gettime64 = ptp_mpipe_gettime,
- .settime64 = ptp_mpipe_settime,
- .enable = ptp_mpipe_enable,
-};
-
-/* Sync mPIPE's timestamp up with Linux system time and register PTP clock. */
-static void register_ptp_clock(struct net_device *dev, struct mpipe_data *md)
-{
- struct timespec64 ts;
-
- ktime_get_ts64(&ts);
- gxio_mpipe_set_timestamp(&md->context, &ts);
-
- mutex_init(&md->ptp_lock);
- md->caps = ptp_mpipe_caps;
- md->ptp_clock = ptp_clock_register(&md->caps, NULL);
- if (IS_ERR(md->ptp_clock))
- netdev_err(dev, "ptp_clock_register failed %ld\n",
- PTR_ERR(md->ptp_clock));
-}
-
-/* Initialize PTP fields in a new device. */
-static void init_ptp_dev(struct tile_net_priv *priv)
-{
- priv->stamp_cfg.rx_filter = HWTSTAMP_FILTER_NONE;
- priv->stamp_cfg.tx_type = HWTSTAMP_TX_OFF;
-}
-
-/* Helper functions for "tile_net_update()". */
-static void enable_ingress_irq(void *irq)
-{
- enable_percpu_irq((long)irq, 0);
-}
-
-static void disable_ingress_irq(void *irq)
-{
- disable_percpu_irq((long)irq);
-}
-
-/* Helper function for tile_net_open() and tile_net_stop().
- * Always called under tile_net_devs_for_channel_mutex.
- */
-static int tile_net_update(struct net_device *dev)
-{
- static gxio_mpipe_rules_t rules; /* too big to fit on the stack */
- bool saw_channel = false;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- int channel;
- int rc;
- int cpu;
-
- saw_channel = false;
- gxio_mpipe_rules_init(&rules, &md->context);
-
- for (channel = 0; channel < TILE_NET_CHANNELS; channel++) {
- if (md->tile_net_devs_for_channel[channel] == NULL)
- continue;
- if (!saw_channel) {
- saw_channel = true;
- gxio_mpipe_rules_begin(&rules, md->first_bucket,
- md->num_buckets, NULL);
- gxio_mpipe_rules_set_headroom(&rules, NET_IP_ALIGN);
- }
- gxio_mpipe_rules_add_channel(&rules, channel);
- }
-
- /* NOTE: This can fail if there is no classifier.
- * ISSUE: Can anything else cause it to fail?
- */
- rc = gxio_mpipe_rules_commit(&rules);
- if (rc != 0) {
- netdev_warn(dev, "gxio_mpipe_rules_commit: mpipe[%d] %d\n",
- instance, rc);
- return -EIO;
- }
-
- /* Update all cpus, sequentially (to protect "netif_napi_add()").
- * We use on_each_cpu to handle the IPI mask or unmask.
- */
- if (!saw_channel)
- on_each_cpu(disable_ingress_irq,
- (void *)(long)(md->ingress_irq), 1);
- for_each_online_cpu(cpu) {
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
-
- if (!info->mpipe[instance].has_iqueue)
- continue;
- if (saw_channel) {
- if (!info->mpipe[instance].napi_added) {
- netif_napi_add(dev, &info->mpipe[instance].napi,
- tile_net_poll, TILE_NET_WEIGHT);
- info->mpipe[instance].napi_added = true;
- }
- if (!info->mpipe[instance].napi_enabled) {
- napi_enable(&info->mpipe[instance].napi);
- info->mpipe[instance].napi_enabled = true;
- }
- } else {
- if (info->mpipe[instance].napi_enabled) {
- napi_disable(&info->mpipe[instance].napi);
- info->mpipe[instance].napi_enabled = false;
- }
- /* FIXME: Drain the iqueue. */
- }
- }
- if (saw_channel)
- on_each_cpu(enable_ingress_irq,
- (void *)(long)(md->ingress_irq), 1);
-
- /* HACK: Allow packets to flow in the simulator. */
- if (saw_channel)
- sim_enable_mpipe_links(instance, -1);
-
- return 0;
-}
-
-/* Initialize a buffer stack. */
-static int create_buffer_stack(struct net_device *dev,
- int kind, size_t num_buffers)
-{
- pte_t hash_pte = pte_set_home((pte_t) { 0 }, PAGE_HOME_HASH);
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- size_t needed = gxio_mpipe_calc_buffer_stack_bytes(num_buffers);
- int stack_idx = md->first_buffer_stack + kind;
- void *va;
- int i, rc;
-
- /* Round up to 64KB and then use alloc_pages() so we get the
- * required 64KB alignment.
- */
- md->buffer_stack_bytes[kind] =
- ALIGN(needed, 64 * 1024);
-
- va = alloc_pages_exact(md->buffer_stack_bytes[kind], GFP_KERNEL);
- if (va == NULL) {
- netdev_err(dev,
- "Could not alloc %zd bytes for buffer stack %d\n",
- md->buffer_stack_bytes[kind], kind);
- return -ENOMEM;
- }
-
- /* Initialize the buffer stack. */
- rc = gxio_mpipe_init_buffer_stack(&md->context, stack_idx,
- buffer_size_enums[kind], va,
- md->buffer_stack_bytes[kind], 0);
- if (rc != 0) {
- netdev_err(dev, "gxio_mpipe_init_buffer_stack: mpipe[%d] %d\n",
- instance, rc);
- free_pages_exact(va, md->buffer_stack_bytes[kind]);
- return rc;
- }
-
- md->buffer_stack_vas[kind] = va;
-
- rc = gxio_mpipe_register_client_memory(&md->context, stack_idx,
- hash_pte, 0);
- if (rc != 0) {
- netdev_err(dev,
- "gxio_mpipe_register_client_memory: mpipe[%d] %d\n",
- instance, rc);
- return rc;
- }
-
- /* Provide initial buffers. */
- for (i = 0; i < num_buffers; i++) {
- if (!tile_net_provide_buffer(instance, kind)) {
- netdev_err(dev, "Cannot allocate initial sk_bufs!\n");
- return -ENOMEM;
- }
- }
-
- return 0;
-}
-
-/* Allocate and initialize mpipe buffer stacks, and register them in
- * the mPIPE TLBs, for small, large, and (possibly) jumbo packet sizes.
- * This routine supports tile_net_init_mpipe(), below.
- */
-static int init_buffer_stacks(struct net_device *dev,
- int network_cpus_count)
-{
- int num_kinds = MAX_KINDS - (jumbo_num == 0);
- size_t num_buffers;
- int rc;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
-
- /* Allocate the buffer stacks. */
- rc = gxio_mpipe_alloc_buffer_stacks(&md->context, num_kinds, 0, 0);
- if (rc < 0) {
- netdev_err(dev,
- "gxio_mpipe_alloc_buffer_stacks: mpipe[%d] %d\n",
- instance, rc);
- return rc;
- }
- md->first_buffer_stack = rc;
-
- /* Enough small/large buffers to (normally) avoid buffer errors. */
- num_buffers =
- network_cpus_count * (IQUEUE_ENTRIES + TILE_NET_BATCH);
-
- /* Allocate the small memory stack. */
- if (rc >= 0)
- rc = create_buffer_stack(dev, 0, num_buffers);
-
- /* Allocate the large buffer stack. */
- if (rc >= 0)
- rc = create_buffer_stack(dev, 1, num_buffers);
-
- /* Allocate the jumbo buffer stack if needed. */
- if (rc >= 0 && jumbo_num != 0)
- rc = create_buffer_stack(dev, 2, jumbo_num);
-
- return rc;
-}
-
-/* Allocate per-cpu resources (memory for completions and idescs).
- * This routine supports tile_net_init_mpipe(), below.
- */
-static int alloc_percpu_mpipe_resources(struct net_device *dev,
- int cpu, int ring)
-{
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
- int order, i, rc;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- struct page *page;
- void *addr;
-
- /* Allocate the "comps". */
- order = get_order(COMPS_SIZE);
- page = homecache_alloc_pages(GFP_KERNEL, order, cpu);
- if (page == NULL) {
- netdev_err(dev, "Failed to alloc %zd bytes comps memory\n",
- COMPS_SIZE);
- return -ENOMEM;
- }
- addr = pfn_to_kaddr(page_to_pfn(page));
- memset(addr, 0, COMPS_SIZE);
- for (i = 0; i < TILE_NET_CHANNELS; i++)
- info->mpipe[instance].comps_for_echannel[i] =
- addr + i * sizeof(struct tile_net_comps);
-
- /* If this is a network cpu, create an iqueue. */
- if (cpumask_test_cpu(cpu, &network_cpus_map)) {
- order = get_order(NOTIF_RING_SIZE);
- page = homecache_alloc_pages(GFP_KERNEL, order, cpu);
- if (page == NULL) {
- netdev_err(dev,
- "Failed to alloc %zd bytes iqueue memory\n",
- NOTIF_RING_SIZE);
- return -ENOMEM;
- }
- addr = pfn_to_kaddr(page_to_pfn(page));
- rc = gxio_mpipe_iqueue_init(&info->mpipe[instance].iqueue,
- &md->context, ring++, addr,
- NOTIF_RING_SIZE, 0);
- if (rc < 0) {
- netdev_err(dev,
- "gxio_mpipe_iqueue_init failed: %d\n", rc);
- return rc;
- }
- info->mpipe[instance].has_iqueue = true;
- }
-
- return ring;
-}
-
-/* Initialize NotifGroup and buckets.
- * This routine supports tile_net_init_mpipe(), below.
- */
-static int init_notif_group_and_buckets(struct net_device *dev,
- int ring, int network_cpus_count)
-{
- int group, rc;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
-
- /* Allocate one NotifGroup. */
- rc = gxio_mpipe_alloc_notif_groups(&md->context, 1, 0, 0);
- if (rc < 0) {
- netdev_err(dev, "gxio_mpipe_alloc_notif_groups: mpipe[%d] %d\n",
- instance, rc);
- return rc;
- }
- group = rc;
-
- /* Initialize global num_buckets value. */
- if (network_cpus_count > 4)
- md->num_buckets = 256;
- else if (network_cpus_count > 1)
- md->num_buckets = 16;
-
- /* Allocate some buckets, and set global first_bucket value. */
- rc = gxio_mpipe_alloc_buckets(&md->context, md->num_buckets, 0, 0);
- if (rc < 0) {
- netdev_err(dev, "gxio_mpipe_alloc_buckets: mpipe[%d] %d\n",
- instance, rc);
- return rc;
- }
- md->first_bucket = rc;
-
- /* Init group and buckets. */
- rc = gxio_mpipe_init_notif_group_and_buckets(
- &md->context, group, ring, network_cpus_count,
- md->first_bucket, md->num_buckets,
- GXIO_MPIPE_BUCKET_STICKY_FLOW_LOCALITY);
- if (rc != 0) {
- netdev_err(dev, "gxio_mpipe_init_notif_group_and_buckets: "
- "mpipe[%d] %d\n", instance, rc);
- return rc;
- }
-
- return 0;
-}
-
-/* Create an irq and register it, then activate the irq and request
- * interrupts on all cores. Note that "ingress_irq" being initialized
- * is how we know not to call tile_net_init_mpipe() again.
- * This routine supports tile_net_init_mpipe(), below.
- */
-static int tile_net_setup_interrupts(struct net_device *dev)
-{
- int cpu, rc, irq;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
-
- irq = md->ingress_irq;
- if (irq < 0) {
- irq = irq_alloc_hwirq(-1);
- if (!irq) {
- netdev_err(dev,
- "create_irq failed: mpipe[%d] %d\n",
- instance, irq);
- return irq;
- }
- tile_irq_activate(irq, TILE_IRQ_PERCPU);
-
- rc = request_irq(irq, tile_net_handle_ingress_irq,
- 0, "tile_net", (void *)((uint64_t)instance));
-
- if (rc != 0) {
- netdev_err(dev, "request_irq failed: mpipe[%d] %d\n",
- instance, rc);
- irq_free_hwirq(irq);
- return rc;
- }
- md->ingress_irq = irq;
- }
-
- for_each_online_cpu(cpu) {
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
- if (info->mpipe[instance].has_iqueue) {
- gxio_mpipe_request_notif_ring_interrupt(&md->context,
- cpu_x(cpu), cpu_y(cpu), KERNEL_PL, irq,
- info->mpipe[instance].iqueue.ring);
- }
- }
-
- return 0;
-}
-
-/* Undo any state set up partially by a failed call to tile_net_init_mpipe. */
-static void tile_net_init_mpipe_fail(int instance)
-{
- int kind, cpu;
- struct mpipe_data *md = &mpipe_data[instance];
-
- /* Do cleanups that require the mpipe context first. */
- for (kind = 0; kind < MAX_KINDS; kind++) {
- if (md->buffer_stack_vas[kind] != NULL) {
- tile_net_pop_all_buffers(instance,
- md->first_buffer_stack +
- kind);
- }
- }
-
- /* Destroy mpipe context so the hardware no longer owns any memory. */
- gxio_mpipe_destroy(&md->context);
-
- for_each_online_cpu(cpu) {
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
- free_pages(
- (unsigned long)(
- info->mpipe[instance].comps_for_echannel[0]),
- get_order(COMPS_SIZE));
- info->mpipe[instance].comps_for_echannel[0] = NULL;
- free_pages((unsigned long)(info->mpipe[instance].iqueue.idescs),
- get_order(NOTIF_RING_SIZE));
- info->mpipe[instance].iqueue.idescs = NULL;
- }
-
- for (kind = 0; kind < MAX_KINDS; kind++) {
- if (md->buffer_stack_vas[kind] != NULL) {
- free_pages_exact(md->buffer_stack_vas[kind],
- md->buffer_stack_bytes[kind]);
- md->buffer_stack_vas[kind] = NULL;
- }
- }
-
- md->first_buffer_stack = -1;
- md->first_bucket = -1;
-}
-
-/* The first time any tilegx network device is opened, we initialize
- * the global mpipe state. If this step fails, we fail to open the
- * device, but if it succeeds, we never need to do it again, and since
- * tile_net can't be unloaded, we never undo it.
- *
- * Note that some resources in this path (buffer stack indices,
- * bindings from init_buffer_stack, etc.) are hypervisor resources
- * that are freed implicitly by gxio_mpipe_destroy().
- */
-static int tile_net_init_mpipe(struct net_device *dev)
-{
- int rc;
- int cpu;
- int first_ring, ring;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- int network_cpus_count = cpumask_weight(&network_cpus_map);
-
- if (!hash_default) {
- netdev_err(dev, "Networking requires hash_default!\n");
- return -EIO;
- }
-
- rc = gxio_mpipe_init(&md->context, instance);
- if (rc != 0) {
- netdev_err(dev, "gxio_mpipe_init: mpipe[%d] %d\n",
- instance, rc);
- return -EIO;
- }
-
- /* Set up the buffer stacks. */
- rc = init_buffer_stacks(dev, network_cpus_count);
- if (rc != 0)
- goto fail;
-
- /* Allocate one NotifRing for each network cpu. */
- rc = gxio_mpipe_alloc_notif_rings(&md->context,
- network_cpus_count, 0, 0);
- if (rc < 0) {
- netdev_err(dev, "gxio_mpipe_alloc_notif_rings failed %d\n",
- rc);
- goto fail;
- }
-
- /* Init NotifRings per-cpu. */
- first_ring = rc;
- ring = first_ring;
- for_each_online_cpu(cpu) {
- rc = alloc_percpu_mpipe_resources(dev, cpu, ring);
- if (rc < 0)
- goto fail;
- ring = rc;
- }
-
- /* Initialize NotifGroup and buckets. */
- rc = init_notif_group_and_buckets(dev, first_ring, network_cpus_count);
- if (rc != 0)
- goto fail;
-
- /* Create and enable interrupts. */
- rc = tile_net_setup_interrupts(dev);
- if (rc != 0)
- goto fail;
-
- /* Register PTP clock and set mPIPE timestamp, if configured. */
- register_ptp_clock(dev, md);
-
- return 0;
-
-fail:
- tile_net_init_mpipe_fail(instance);
- return rc;
-}
-
-/* Create persistent egress info for a given egress channel.
- * Note that this may be shared between, say, "gbe0" and "xgbe0".
- * ISSUE: Defer header allocation until TSO is actually needed?
- */
-static int tile_net_init_egress(struct net_device *dev, int echannel)
-{
- static int ering = -1;
- struct page *headers_page, *edescs_page, *equeue_page;
- gxio_mpipe_edesc_t *edescs;
- gxio_mpipe_equeue_t *equeue;
- unsigned char *headers;
- int headers_order, edescs_order, equeue_order;
- size_t edescs_size;
- int rc = -ENOMEM;
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
-
- /* Only initialize once. */
- if (md->egress_for_echannel[echannel].equeue != NULL)
- return 0;
-
- /* Allocate memory for the "headers". */
- headers_order = get_order(EQUEUE_ENTRIES * HEADER_BYTES);
- headers_page = alloc_pages(GFP_KERNEL, headers_order);
- if (headers_page == NULL) {
- netdev_warn(dev,
- "Could not alloc %zd bytes for TSO headers.\n",
- PAGE_SIZE << headers_order);
- goto fail;
- }
- headers = pfn_to_kaddr(page_to_pfn(headers_page));
-
- /* Allocate memory for the "edescs". */
- edescs_size = EQUEUE_ENTRIES * sizeof(*edescs);
- edescs_order = get_order(edescs_size);
- edescs_page = alloc_pages(GFP_KERNEL, edescs_order);
- if (edescs_page == NULL) {
- netdev_warn(dev,
- "Could not alloc %zd bytes for eDMA ring.\n",
- edescs_size);
- goto fail_headers;
- }
- edescs = pfn_to_kaddr(page_to_pfn(edescs_page));
-
- /* Allocate memory for the "equeue". */
- equeue_order = get_order(sizeof(*equeue));
- equeue_page = alloc_pages(GFP_KERNEL, equeue_order);
- if (equeue_page == NULL) {
- netdev_warn(dev,
- "Could not alloc %zd bytes for equeue info.\n",
- PAGE_SIZE << equeue_order);
- goto fail_edescs;
- }
- equeue = pfn_to_kaddr(page_to_pfn(equeue_page));
-
- /* Allocate an edma ring (using a one entry "free list"). */
- if (ering < 0) {
- rc = gxio_mpipe_alloc_edma_rings(&md->context, 1, 0, 0);
- if (rc < 0) {
- netdev_warn(dev, "gxio_mpipe_alloc_edma_rings: "
- "mpipe[%d] %d\n", instance, rc);
- goto fail_equeue;
- }
- ering = rc;
- }
-
- /* Initialize the equeue. */
- rc = gxio_mpipe_equeue_init(equeue, &md->context, ering, echannel,
- edescs, edescs_size, 0);
- if (rc != 0) {
- netdev_err(dev, "gxio_mpipe_equeue_init: mpipe[%d] %d\n",
- instance, rc);
- goto fail_equeue;
- }
-
- /* Don't reuse the ering later. */
- ering = -1;
-
- if (jumbo_num != 0) {
- /* Make sure "jumbo" packets can be egressed safely. */
- if (gxio_mpipe_equeue_set_snf_size(equeue, 10368) < 0) {
- /* ISSUE: There is no "gxio_mpipe_equeue_destroy()". */
- netdev_warn(dev, "Jumbo packets may not be egressed"
- " properly on channel %d\n", echannel);
- }
- }
-
- /* Done. */
- md->egress_for_echannel[echannel].equeue = equeue;
- md->egress_for_echannel[echannel].headers = headers;
- return 0;
-
-fail_equeue:
- __free_pages(equeue_page, equeue_order);
-
-fail_edescs:
- __free_pages(edescs_page, edescs_order);
-
-fail_headers:
- __free_pages(headers_page, headers_order);
-
-fail:
- return rc;
-}
-
-/* Return channel number for a newly-opened link. */
-static int tile_net_link_open(struct net_device *dev, gxio_mpipe_link_t *link,
- const char *link_name)
-{
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- int rc = gxio_mpipe_link_open(link, &md->context, link_name, 0);
- if (rc < 0) {
- netdev_err(dev, "Failed to open '%s', mpipe[%d], %d\n",
- link_name, instance, rc);
- return rc;
- }
- if (jumbo_num != 0) {
- u32 attr = GXIO_MPIPE_LINK_RECEIVE_JUMBO;
- rc = gxio_mpipe_link_set_attr(link, attr, 1);
- if (rc != 0) {
- netdev_err(dev,
- "Cannot receive jumbo packets on '%s'\n",
- link_name);
- gxio_mpipe_link_close(link);
- return rc;
- }
- }
- rc = gxio_mpipe_link_channel(link);
- if (rc < 0 || rc >= TILE_NET_CHANNELS) {
- netdev_err(dev, "gxio_mpipe_link_channel bad value: %d\n", rc);
- gxio_mpipe_link_close(link);
- return -EINVAL;
- }
- return rc;
-}
-
-/* Help the kernel activate the given network interface. */
-static int tile_net_open(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int cpu, rc, instance;
-
- mutex_lock(&tile_net_devs_for_channel_mutex);
-
- /* Get the instance info. */
- rc = gxio_mpipe_link_instance(dev->name);
- if (rc < 0 || rc >= NR_MPIPE_MAX) {
- mutex_unlock(&tile_net_devs_for_channel_mutex);
- return -EIO;
- }
-
- priv->instance = rc;
- instance = rc;
- if (!mpipe_data[rc].context.mmio_fast_base) {
- /* Do one-time initialization per instance the first time
- * any device is opened.
- */
- rc = tile_net_init_mpipe(dev);
- if (rc != 0)
- goto fail;
- }
-
- /* Determine if this is the "loopify" device. */
- if (unlikely((loopify_link_name != NULL) &&
- !strcmp(dev->name, loopify_link_name))) {
- rc = tile_net_link_open(dev, &priv->link, "loop0");
- if (rc < 0)
- goto fail;
- priv->channel = rc;
- rc = tile_net_link_open(dev, &priv->loopify_link, "loop1");
- if (rc < 0)
- goto fail;
- priv->loopify_channel = rc;
- priv->echannel = rc;
- } else {
- rc = tile_net_link_open(dev, &priv->link, dev->name);
- if (rc < 0)
- goto fail;
- priv->channel = rc;
- priv->echannel = rc;
- }
-
- /* Initialize egress info (if needed). Once ever, per echannel. */
- rc = tile_net_init_egress(dev, priv->echannel);
- if (rc != 0)
- goto fail;
-
- mpipe_data[instance].tile_net_devs_for_channel[priv->channel] = dev;
-
- rc = tile_net_update(dev);
- if (rc != 0)
- goto fail;
-
- mutex_unlock(&tile_net_devs_for_channel_mutex);
-
- /* Initialize the transmit wake timer for this device for each cpu. */
- for_each_online_cpu(cpu) {
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
- struct tile_net_tx_wake *tx_wake =
- &info->mpipe[instance].tx_wake[priv->echannel];
-
- hrtimer_init(&tx_wake->timer, CLOCK_MONOTONIC,
- HRTIMER_MODE_REL);
- tx_wake->tx_queue_idx = cpu;
- tx_wake->timer.function = tile_net_handle_tx_wake_timer;
- tx_wake->dev = dev;
- }
-
- for_each_online_cpu(cpu)
- netif_start_subqueue(dev, cpu);
- netif_carrier_on(dev);
- return 0;
-
-fail:
- if (priv->loopify_channel >= 0) {
- if (gxio_mpipe_link_close(&priv->loopify_link) != 0)
- netdev_warn(dev, "Failed to close loopify link!\n");
- priv->loopify_channel = -1;
- }
- if (priv->channel >= 0) {
- if (gxio_mpipe_link_close(&priv->link) != 0)
- netdev_warn(dev, "Failed to close link!\n");
- priv->channel = -1;
- }
- priv->echannel = -1;
- mpipe_data[instance].tile_net_devs_for_channel[priv->channel] = NULL;
- mutex_unlock(&tile_net_devs_for_channel_mutex);
-
- /* Don't return raw gxio error codes to generic Linux. */
- return (rc > -512) ? rc : -EIO;
-}
-
-/* Help the kernel deactivate the given network interface. */
-static int tile_net_stop(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int cpu;
- int instance = priv->instance;
- struct mpipe_data *md = &mpipe_data[instance];
-
- for_each_online_cpu(cpu) {
- struct tile_net_info *info = &per_cpu(per_cpu_info, cpu);
- struct tile_net_tx_wake *tx_wake =
- &info->mpipe[instance].tx_wake[priv->echannel];
-
- hrtimer_cancel(&tx_wake->timer);
- netif_stop_subqueue(dev, cpu);
- }
-
- mutex_lock(&tile_net_devs_for_channel_mutex);
- md->tile_net_devs_for_channel[priv->channel] = NULL;
- (void)tile_net_update(dev);
- if (priv->loopify_channel >= 0) {
- if (gxio_mpipe_link_close(&priv->loopify_link) != 0)
- netdev_warn(dev, "Failed to close loopify link!\n");
- priv->loopify_channel = -1;
- }
- if (priv->channel >= 0) {
- if (gxio_mpipe_link_close(&priv->link) != 0)
- netdev_warn(dev, "Failed to close link!\n");
- priv->channel = -1;
- }
- priv->echannel = -1;
- mutex_unlock(&tile_net_devs_for_channel_mutex);
-
- return 0;
-}
-
-/* Determine the VA for a fragment. */
-static inline void *tile_net_frag_buf(skb_frag_t *f)
-{
- unsigned long pfn = page_to_pfn(skb_frag_page(f));
- return pfn_to_kaddr(pfn) + f->page_offset;
-}
-
-/* Acquire a completion entry and an egress slot, or if we can't,
- * stop the queue and schedule the tx_wake timer.
- */
-static s64 tile_net_equeue_try_reserve(struct net_device *dev,
- int tx_queue_idx,
- struct tile_net_comps *comps,
- gxio_mpipe_equeue_t *equeue,
- int num_edescs)
-{
- /* Try to acquire a completion entry. */
- if (comps->comp_next - comps->comp_last < TILE_NET_MAX_COMPS - 1 ||
- tile_net_free_comps(equeue, comps, 32, false) != 0) {
-
- /* Try to acquire an egress slot. */
- s64 slot = gxio_mpipe_equeue_try_reserve(equeue, num_edescs);
- if (slot >= 0)
- return slot;
-
- /* Freeing some completions gives the equeue time to drain. */
- tile_net_free_comps(equeue, comps, TILE_NET_MAX_COMPS, false);
-
- slot = gxio_mpipe_equeue_try_reserve(equeue, num_edescs);
- if (slot >= 0)
- return slot;
- }
-
- /* Still nothing; give up and stop the queue for a short while. */
- netif_stop_subqueue(dev, tx_queue_idx);
- tile_net_schedule_tx_wake_timer(dev, tx_queue_idx);
- return -1;
-}
-
-/* Determine how many edesc's are needed for TSO.
- *
- * Sometimes, if "sendfile()" requires copying, we will be called with
- * "data" containing the header and payload, with "frags" being empty.
- * Sometimes, for example when using NFS over TCP, a single segment can
- * span 3 fragments. This requires special care.
- */
-static int tso_count_edescs(struct sk_buff *skb)
-{
- struct skb_shared_info *sh = skb_shinfo(skb);
- unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
- unsigned int data_len = skb->len - sh_len;
- unsigned int p_len = sh->gso_size;
- long f_id = -1; /* id of the current fragment */
- long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
- long f_used = 0; /* bytes used from the current fragment */
- long n; /* size of the current piece of payload */
- int num_edescs = 0;
- int segment;
-
- for (segment = 0; segment < sh->gso_segs; segment++) {
-
- unsigned int p_used = 0;
-
- /* One edesc for header and for each piece of the payload. */
- for (num_edescs++; p_used < p_len; num_edescs++) {
-
- /* Advance as needed. */
- while (f_used >= f_size) {
- f_id++;
- f_size = skb_frag_size(&sh->frags[f_id]);
- f_used = 0;
- }
-
- /* Use bytes from the current fragment. */
- n = p_len - p_used;
- if (n > f_size - f_used)
- n = f_size - f_used;
- f_used += n;
- p_used += n;
- }
-
- /* The last segment may be less than gso_size. */
- data_len -= p_len;
- if (data_len < p_len)
- p_len = data_len;
- }
-
- return num_edescs;
-}
-
-/* Prepare modified copies of the skbuff headers. */
-static void tso_headers_prepare(struct sk_buff *skb, unsigned char *headers,
- s64 slot)
-{
- struct skb_shared_info *sh = skb_shinfo(skb);
- struct iphdr *ih;
- struct ipv6hdr *ih6;
- struct tcphdr *th;
- unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
- unsigned int data_len = skb->len - sh_len;
- unsigned char *data = skb->data;
- unsigned int ih_off, th_off, p_len;
- unsigned int isum_seed, tsum_seed, seq;
- unsigned int uninitialized_var(id);
- int is_ipv6;
- long f_id = -1; /* id of the current fragment */
- long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
- long f_used = 0; /* bytes used from the current fragment */
- long n; /* size of the current piece of payload */
- int segment;
-
- /* Locate original headers and compute various lengths. */
- is_ipv6 = skb_is_gso_v6(skb);
- if (is_ipv6) {
- ih6 = ipv6_hdr(skb);
- ih_off = skb_network_offset(skb);
- } else {
- ih = ip_hdr(skb);
- ih_off = skb_network_offset(skb);
- isum_seed = ((0xFFFF - ih->check) +
- (0xFFFF - ih->tot_len) +
- (0xFFFF - ih->id));
- id = ntohs(ih->id);
- }
-
- th = tcp_hdr(skb);
- th_off = skb_transport_offset(skb);
- p_len = sh->gso_size;
-
- tsum_seed = th->check + (0xFFFF ^ htons(skb->len));
- seq = ntohl(th->seq);
-
- /* Prepare all the headers. */
- for (segment = 0; segment < sh->gso_segs; segment++) {
- unsigned char *buf;
- unsigned int p_used = 0;
-
- /* Copy to the header memory for this segment. */
- buf = headers + (slot % EQUEUE_ENTRIES) * HEADER_BYTES +
- NET_IP_ALIGN;
- memcpy(buf, data, sh_len);
-
- /* Update copied ip header. */
- if (is_ipv6) {
- ih6 = (struct ipv6hdr *)(buf + ih_off);
- ih6->payload_len = htons(sh_len + p_len - ih_off -
- sizeof(*ih6));
- } else {
- ih = (struct iphdr *)(buf + ih_off);
- ih->tot_len = htons(sh_len + p_len - ih_off);
- ih->id = htons(id++);
- ih->check = csum_long(isum_seed + ih->tot_len +
- ih->id) ^ 0xffff;
- }
-
- /* Update copied tcp header. */
- th = (struct tcphdr *)(buf + th_off);
- th->seq = htonl(seq);
- th->check = csum_long(tsum_seed + htons(sh_len + p_len));
- if (segment != sh->gso_segs - 1) {
- th->fin = 0;
- th->psh = 0;
- }
-
- /* Skip past the header. */
- slot++;
-
- /* Skip past the payload. */
- while (p_used < p_len) {
-
- /* Advance as needed. */
- while (f_used >= f_size) {
- f_id++;
- f_size = skb_frag_size(&sh->frags[f_id]);
- f_used = 0;
- }
-
- /* Use bytes from the current fragment. */
- n = p_len - p_used;
- if (n > f_size - f_used)
- n = f_size - f_used;
- f_used += n;
- p_used += n;
-
- slot++;
- }
-
- seq += p_len;
-
- /* The last segment may be less than gso_size. */
- data_len -= p_len;
- if (data_len < p_len)
- p_len = data_len;
- }
-
- /* Flush the headers so they are ready for hardware DMA. */
- wmb();
-}
-
-/* Pass all the data to mpipe for egress. */
-static void tso_egress(struct net_device *dev, gxio_mpipe_equeue_t *equeue,
- struct sk_buff *skb, unsigned char *headers, s64 slot)
-{
- struct skb_shared_info *sh = skb_shinfo(skb);
- int instance = mpipe_instance(dev);
- struct mpipe_data *md = &mpipe_data[instance];
- unsigned int sh_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
- unsigned int data_len = skb->len - sh_len;
- unsigned int p_len = sh->gso_size;
- gxio_mpipe_edesc_t edesc_head = { { 0 } };
- gxio_mpipe_edesc_t edesc_body = { { 0 } };
- long f_id = -1; /* id of the current fragment */
- long f_size = skb_headlen(skb) - sh_len; /* current fragment size */
- long f_used = 0; /* bytes used from the current fragment */
- void *f_data = skb->data + sh_len;
- long n; /* size of the current piece of payload */
- unsigned long tx_packets = 0, tx_bytes = 0;
- unsigned int csum_start;
- int segment;
-
- /* Prepare to egress the headers: set up header edesc. */
- csum_start = skb_checksum_start_offset(skb);
- edesc_head.csum = 1;
- edesc_head.csum_start = csum_start;
- edesc_head.csum_dest = csum_start + skb->csum_offset;
- edesc_head.xfer_size = sh_len;
-
- /* This is only used to specify the TLB. */
- edesc_head.stack_idx = md->first_buffer_stack;
- edesc_body.stack_idx = md->first_buffer_stack;
-
- /* Egress all the edescs. */
- for (segment = 0; segment < sh->gso_segs; segment++) {
- unsigned char *buf;
- unsigned int p_used = 0;
-
- /* Egress the header. */
- buf = headers + (slot % EQUEUE_ENTRIES) * HEADER_BYTES +
- NET_IP_ALIGN;
- edesc_head.va = va_to_tile_io_addr(buf);
- gxio_mpipe_equeue_put_at(equeue, edesc_head, slot);
- slot++;
-
- /* Egress the payload. */
- while (p_used < p_len) {
- void *va;
-
- /* Advance as needed. */
- while (f_used >= f_size) {
- f_id++;
- f_size = skb_frag_size(&sh->frags[f_id]);
- f_data = tile_net_frag_buf(&sh->frags[f_id]);
- f_used = 0;
- }
-
- va = f_data + f_used;
-
- /* Use bytes from the current fragment. */
- n = p_len - p_used;
- if (n > f_size - f_used)
- n = f_size - f_used;
- f_used += n;
- p_used += n;
-
- /* Egress a piece of the payload. */
- edesc_body.va = va_to_tile_io_addr(va);
- edesc_body.xfer_size = n;
- edesc_body.bound = !(p_used < p_len);
- gxio_mpipe_equeue_put_at(equeue, edesc_body, slot);
- slot++;
- }
-
- tx_packets++;
- tx_bytes += sh_len + p_len;
-
- /* The last segment may be less than gso_size. */
- data_len -= p_len;
- if (data_len < p_len)
- p_len = data_len;
- }
-
- /* Update stats. */
- tile_net_stats_add(tx_packets, &dev->stats.tx_packets);
- tile_net_stats_add(tx_bytes, &dev->stats.tx_bytes);
-}
-
-/* Do "TSO" handling for egress.
- *
- * Normally drivers set NETIF_F_TSO only to support hardware TSO;
- * otherwise the stack uses scatter-gather to implement GSO in software.
- * On our testing, enabling GSO support (via NETIF_F_SG) drops network
- * performance down to around 7.5 Gbps on the 10G interfaces, although
- * also dropping cpu utilization way down, to under 8%. But
- * implementing "TSO" in the driver brings performance back up to line
- * rate, while dropping cpu usage even further, to less than 4%. In
- * practice, profiling of GSO shows that skb_segment() is what causes
- * the performance overheads; we benefit in the driver from using
- * preallocated memory to duplicate the TCP/IP headers.
- */
-static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- struct tile_net_priv *priv = netdev_priv(dev);
- int channel = priv->echannel;
- int instance = priv->instance;
- struct mpipe_data *md = &mpipe_data[instance];
- struct tile_net_egress *egress = &md->egress_for_echannel[channel];
- struct tile_net_comps *comps =
- info->mpipe[instance].comps_for_echannel[channel];
- gxio_mpipe_equeue_t *equeue = egress->equeue;
- unsigned long irqflags;
- int num_edescs;
- s64 slot;
-
- /* Determine how many mpipe edesc's are needed. */
- num_edescs = tso_count_edescs(skb);
-
- local_irq_save(irqflags);
-
- /* Try to acquire a completion entry and an egress slot. */
- slot = tile_net_equeue_try_reserve(dev, skb->queue_mapping, comps,
- equeue, num_edescs);
- if (slot < 0) {
- local_irq_restore(irqflags);
- return NETDEV_TX_BUSY;
- }
-
- /* Set up copies of header data properly. */
- tso_headers_prepare(skb, egress->headers, slot);
-
- /* Actually pass the data to the network hardware. */
- tso_egress(dev, equeue, skb, egress->headers, slot);
-
- /* Add a completion record. */
- add_comp(equeue, comps, slot + num_edescs - 1, skb);
-
- local_irq_restore(irqflags);
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer();
-
- return NETDEV_TX_OK;
-}
-
-/* Analyze the body and frags for a transmit request. */
-static unsigned int tile_net_tx_frags(struct frag *frags,
- struct sk_buff *skb,
- void *b_data, unsigned int b_len)
-{
- unsigned int i, n = 0;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- if (b_len != 0) {
- frags[n].buf = b_data;
- frags[n++].length = b_len;
- }
-
- for (i = 0; i < sh->nr_frags; i++) {
- skb_frag_t *f = &sh->frags[i];
- frags[n].buf = tile_net_frag_buf(f);
- frags[n++].length = skb_frag_size(f);
- }
-
- return n;
-}
-
-/* Help the kernel transmit a packet. */
-static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- struct tile_net_priv *priv = netdev_priv(dev);
- int instance = priv->instance;
- struct mpipe_data *md = &mpipe_data[instance];
- struct tile_net_egress *egress =
- &md->egress_for_echannel[priv->echannel];
- gxio_mpipe_equeue_t *equeue = egress->equeue;
- struct tile_net_comps *comps =
- info->mpipe[instance].comps_for_echannel[priv->echannel];
- unsigned int len = skb->len;
- unsigned char *data = skb->data;
- unsigned int num_edescs;
- struct frag frags[MAX_FRAGS];
- gxio_mpipe_edesc_t edescs[MAX_FRAGS];
- unsigned long irqflags;
- gxio_mpipe_edesc_t edesc = { { 0 } };
- unsigned int i;
- s64 slot;
-
- if (skb_is_gso(skb))
- return tile_net_tx_tso(skb, dev);
-
- num_edescs = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
-
- /* This is only used to specify the TLB. */
- edesc.stack_idx = md->first_buffer_stack;
-
- /* Prepare the edescs. */
- for (i = 0; i < num_edescs; i++) {
- edesc.xfer_size = frags[i].length;
- edesc.va = va_to_tile_io_addr(frags[i].buf);
- edescs[i] = edesc;
- }
-
- /* Mark the final edesc. */
- edescs[num_edescs - 1].bound = 1;
-
- /* Add checksum info to the initial edesc, if needed. */
- if (skb->ip_summed == CHECKSUM_PARTIAL) {
- unsigned int csum_start = skb_checksum_start_offset(skb);
- edescs[0].csum = 1;
- edescs[0].csum_start = csum_start;
- edescs[0].csum_dest = csum_start + skb->csum_offset;
- }
-
- local_irq_save(irqflags);
-
- /* Try to acquire a completion entry and an egress slot. */
- slot = tile_net_equeue_try_reserve(dev, skb->queue_mapping, comps,
- equeue, num_edescs);
- if (slot < 0) {
- local_irq_restore(irqflags);
- return NETDEV_TX_BUSY;
- }
-
- for (i = 0; i < num_edescs; i++)
- gxio_mpipe_equeue_put_at(equeue, edescs[i], slot++);
-
- /* Store TX timestamp if needed. */
- tile_tx_timestamp(skb, instance);
-
- /* Add a completion record. */
- add_comp(equeue, comps, slot - 1, skb);
-
- /* NOTE: Use ETH_ZLEN for short packets (e.g. 42 < 60). */
- tile_net_stats_add(1, &dev->stats.tx_packets);
- tile_net_stats_add(max_t(unsigned int, len, ETH_ZLEN),
- &dev->stats.tx_bytes);
-
- local_irq_restore(irqflags);
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer();
-
- return NETDEV_TX_OK;
-}
-
-/* Return subqueue id on this core (one per core). */
-static u16 tile_net_select_queue(struct net_device *dev, struct sk_buff *skb,
- void *accel_priv, select_queue_fallback_t fallback)
-{
- return smp_processor_id();
-}
-
-/* Deal with a transmit timeout. */
-static void tile_net_tx_timeout(struct net_device *dev)
-{
- int cpu;
-
- for_each_online_cpu(cpu)
- netif_wake_subqueue(dev, cpu);
-}
-
-/* Ioctl commands. */
-static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- if (cmd == SIOCSHWTSTAMP)
- return tile_hwtstamp_set(dev, rq);
- if (cmd == SIOCGHWTSTAMP)
- return tile_hwtstamp_get(dev, rq);
-
- return -EOPNOTSUPP;
-}
-
-/* Change the Ethernet address of the NIC.
- *
- * The hypervisor driver does not support changing MAC address. However,
- * the hardware does not do anything with the MAC address, so the address
- * which gets used on outgoing packets, and which is accepted on incoming
- * packets, is completely up to us.
- *
- * Returns 0 on success, negative on failure.
- */
-static int tile_net_set_mac_address(struct net_device *dev, void *p)
-{
- struct sockaddr *addr = p;
-
- if (!is_valid_ether_addr(addr->sa_data))
- return -EINVAL;
- memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
- return 0;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-/* Polling 'interrupt' - used by things like netconsole to send skbs
- * without having to re-enable interrupts. It's not called while
- * the interrupt routine is executing.
- */
-static void tile_net_netpoll(struct net_device *dev)
-{
- int instance = mpipe_instance(dev);
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- struct mpipe_data *md = &mpipe_data[instance];
-
- disable_percpu_irq(md->ingress_irq);
- napi_schedule(&info->mpipe[instance].napi);
- enable_percpu_irq(md->ingress_irq, 0);
-}
-#endif
-
-static const struct net_device_ops tile_net_ops = {
- .ndo_open = tile_net_open,
- .ndo_stop = tile_net_stop,
- .ndo_start_xmit = tile_net_tx,
- .ndo_select_queue = tile_net_select_queue,
- .ndo_do_ioctl = tile_net_ioctl,
- .ndo_tx_timeout = tile_net_tx_timeout,
- .ndo_set_mac_address = tile_net_set_mac_address,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = tile_net_netpoll,
-#endif
-};
-
-/* The setup function.
- *
- * This uses ether_setup() to assign various fields in dev, including
- * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
- */
-static void tile_net_setup(struct net_device *dev)
-{
- netdev_features_t features = 0;
-
- ether_setup(dev);
- dev->netdev_ops = &tile_net_ops;
- dev->watchdog_timeo = TILE_NET_TIMEOUT;
-
- /* MTU range: 68 - 1500 or 9000 */
- dev->mtu = ETH_DATA_LEN;
- dev->min_mtu = ETH_MIN_MTU;
- dev->max_mtu = jumbo_num ? TILE_JUMBO_MAX_MTU : ETH_DATA_LEN;
-
- features |= NETIF_F_HW_CSUM;
- features |= NETIF_F_SG;
- features |= NETIF_F_TSO;
- features |= NETIF_F_TSO6;
-
- dev->hw_features |= features;
- dev->vlan_features |= features;
- dev->features |= features;
-}
-
-/* Allocate the device structure, register the device, and obtain the
- * MAC address from the hypervisor.
- */
-static void tile_net_dev_init(const char *name, const uint8_t *mac)
-{
- int ret;
- struct net_device *dev;
- struct tile_net_priv *priv;
-
- /* HACK: Ignore "loop" links. */
- if (strncmp(name, "loop", 4) == 0)
- return;
-
- /* Allocate the device structure. Normally, "name" is a
- * template, instantiated by register_netdev(), but not for us.
- */
- dev = alloc_netdev_mqs(sizeof(*priv), name, NET_NAME_UNKNOWN,
- tile_net_setup, NR_CPUS, 1);
- if (!dev) {
- pr_err("alloc_netdev_mqs(%s) failed\n", name);
- return;
- }
-
- /* Initialize "priv". */
- priv = netdev_priv(dev);
- priv->dev = dev;
- priv->channel = -1;
- priv->loopify_channel = -1;
- priv->echannel = -1;
- init_ptp_dev(priv);
-
- /* Get the MAC address and set it in the device struct; this must
- * be done before the device is opened. If the MAC is all zeroes,
- * we use a random address, since we're probably on the simulator.
- */
- if (!is_zero_ether_addr(mac))
- ether_addr_copy(dev->dev_addr, mac);
- else
- eth_hw_addr_random(dev);
-
- /* Register the network device. */
- ret = register_netdev(dev);
- if (ret) {
- netdev_err(dev, "register_netdev failed %d\n", ret);
- free_netdev(dev);
- return;
- }
-}
-
-/* Per-cpu module initialization. */
-static void tile_net_init_module_percpu(void *unused)
-{
- struct tile_net_info *info = this_cpu_ptr(&per_cpu_info);
- int my_cpu = smp_processor_id();
- int instance;
-
- for (instance = 0; instance < NR_MPIPE_MAX; instance++) {
- info->mpipe[instance].has_iqueue = false;
- info->mpipe[instance].instance = instance;
- }
- info->my_cpu = my_cpu;
-
- /* Initialize the egress timer. */
- hrtimer_init(&info->egress_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- info->egress_timer.function = tile_net_handle_egress_timer;
-}
-
-/* Module initialization. */
-static int __init tile_net_init_module(void)
-{
- int i;
- char name[GXIO_MPIPE_LINK_NAME_LEN];
- uint8_t mac[6];
-
- pr_info("Tilera Network Driver\n");
-
- BUILD_BUG_ON(NR_MPIPE_MAX != 2);
-
- mutex_init(&tile_net_devs_for_channel_mutex);
-
- /* Initialize each CPU. */
- on_each_cpu(tile_net_init_module_percpu, NULL, 1);
-
- /* Find out what devices we have, and initialize them. */
- for (i = 0; gxio_mpipe_link_enumerate_mac(i, name, mac) >= 0; i++)
- tile_net_dev_init(name, mac);
-
- if (!network_cpus_init())
- cpumask_and(&network_cpus_map,
- housekeeping_cpumask(HK_FLAG_MISC), cpu_online_mask);
-
- return 0;
-}
-
-module_init(tile_net_init_module);
+++ /dev/null
-/*
- * Copyright 2011 Tilera Corporation. All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation, version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- * NON INFRINGEMENT. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/moduleparam.h>
-#include <linux/sched.h>
-#include <linux/kernel.h> /* printk() */
-#include <linux/slab.h> /* kmalloc() */
-#include <linux/errno.h> /* error codes */
-#include <linux/types.h> /* size_t */
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/netdevice.h> /* struct device, and other headers */
-#include <linux/etherdevice.h> /* eth_type_trans */
-#include <linux/skbuff.h>
-#include <linux/ioctl.h>
-#include <linux/cdev.h>
-#include <linux/hugetlb.h>
-#include <linux/in6.h>
-#include <linux/timer.h>
-#include <linux/io.h>
-#include <linux/u64_stats_sync.h>
-#include <asm/checksum.h>
-#include <asm/homecache.h>
-
-#include <hv/drv_xgbe_intf.h>
-#include <hv/drv_xgbe_impl.h>
-#include <hv/hypervisor.h>
-#include <hv/netio_intf.h>
-
-/* For TSO */
-#include <linux/ip.h>
-#include <linux/tcp.h>
-
-
-/*
- * First, "tile_net_init_module()" initializes all four "devices" which
- * can be used by linux.
- *
- * Then, "ifconfig DEVICE up" calls "tile_net_open()", which analyzes
- * the network cpus, then uses "tile_net_open_aux()" to initialize
- * LIPP/LEPP, and then uses "tile_net_open_inner()" to register all
- * the tiles, provide buffers to LIPP, allow ingress to start, and
- * turn on hypervisor interrupt handling (and NAPI) on all tiles.
- *
- * If registration fails due to the link being down, then "retry_work"
- * is used to keep calling "tile_net_open_inner()" until it succeeds.
- *
- * If "ifconfig DEVICE down" is called, it uses "tile_net_stop()" to
- * stop egress, drain the LIPP buffers, unregister all the tiles, stop
- * LIPP/LEPP, and wipe the LEPP queue.
- *
- * We start out with the ingress interrupt enabled on each CPU. When
- * this interrupt fires, we disable it, and call "napi_schedule()".
- * This will cause "tile_net_poll()" to be called, which will pull
- * packets from the netio queue, filtering them out, or passing them
- * to "netif_receive_skb()". If our budget is exhausted, we will
- * return, knowing we will be called again later. Otherwise, we
- * reenable the ingress interrupt, and call "napi_complete()".
- *
- * HACK: Since disabling the ingress interrupt is not reliable, we
- * ignore the interrupt if the global "active" flag is false.
- *
- *
- * NOTE: The use of "native_driver" ensures that EPP exists, and that
- * we are using "LIPP" and "LEPP".
- *
- * NOTE: Failing to free completions for an arbitrarily long time
- * (which is defined to be illegal) does in fact cause bizarre
- * problems. The "egress_timer" helps prevent this from happening.
- */
-
-
-/* HACK: Allow use of "jumbo" packets. */
-/* This should be 1500 if "jumbo" is not set in LIPP. */
-/* This should be at most 10226 (10240 - 14) if "jumbo" is set in LIPP. */
-/* ISSUE: This has not been thoroughly tested (except at 1500). */
-#define TILE_NET_MTU ETH_DATA_LEN
-
-/* HACK: Define this to verify incoming packets. */
-/* #define TILE_NET_VERIFY_INGRESS */
-
-/* Use 3000 to enable the Linux Traffic Control (QoS) layer, else 0. */
-#define TILE_NET_TX_QUEUE_LEN 0
-
-/* Define to dump packets (prints out the whole packet on tx and rx). */
-/* #define TILE_NET_DUMP_PACKETS */
-
-/* Define to enable debug spew (all PDEBUG's are enabled). */
-/* #define TILE_NET_DEBUG */
-
-
-/* Define to activate paranoia checks. */
-/* #define TILE_NET_PARANOIA */
-
-/* Default transmit lockup timeout period, in jiffies. */
-#define TILE_NET_TIMEOUT (5 * HZ)
-
-/* Default retry interval for bringing up the NetIO interface, in jiffies. */
-#define TILE_NET_RETRY_INTERVAL (5 * HZ)
-
-/* Number of ports (xgbe0, xgbe1, gbe0, gbe1). */
-#define TILE_NET_DEVS 4
-
-
-
-/* Paranoia. */
-#if NET_IP_ALIGN != LIPP_PACKET_PADDING
-#error "NET_IP_ALIGN must match LIPP_PACKET_PADDING."
-#endif
-
-
-/* Debug print. */
-#ifdef TILE_NET_DEBUG
-#define PDEBUG(fmt, args...) net_printk(fmt, ## args)
-#else
-#define PDEBUG(fmt, args...)
-#endif
-
-
-MODULE_AUTHOR("Tilera");
-MODULE_LICENSE("GPL");
-
-
-/*
- * Queue of incoming packets for a specific cpu and device.
- *
- * Includes a pointer to the "system" data, and the actual "user" data.
- */
-struct tile_netio_queue {
- netio_queue_impl_t *__system_part;
- netio_queue_user_impl_t __user_part;
-
-};
-
-
-/*
- * Statistics counters for a specific cpu and device.
- */
-struct tile_net_stats_t {
- struct u64_stats_sync syncp;
- u64 rx_packets; /* total packets received */
- u64 tx_packets; /* total packets transmitted */
- u64 rx_bytes; /* total bytes received */
- u64 tx_bytes; /* total bytes transmitted */
- u64 rx_errors; /* packets truncated or marked bad by hw */
- u64 rx_dropped; /* packets not for us or intf not up */
-};
-
-
-/*
- * Info for a specific cpu and device.
- *
- * ISSUE: There is a "dev" pointer in "napi" as well.
- */
-struct tile_net_cpu {
- /* The NAPI struct. */
- struct napi_struct napi;
- /* Packet queue. */
- struct tile_netio_queue queue;
- /* Statistics. */
- struct tile_net_stats_t stats;
- /* True iff NAPI is enabled. */
- bool napi_enabled;
- /* True if this tile has successfully registered with the IPP. */
- bool registered;
- /* True if the link was down last time we tried to register. */
- bool link_down;
- /* True if "egress_timer" is scheduled. */
- bool egress_timer_scheduled;
- /* Number of small sk_buffs which must still be provided. */
- unsigned int num_needed_small_buffers;
- /* Number of large sk_buffs which must still be provided. */
- unsigned int num_needed_large_buffers;
- /* A timer for handling egress completions. */
- struct timer_list egress_timer;
-};
-
-
-/*
- * Info for a specific device.
- */
-struct tile_net_priv {
- /* Our network device. */
- struct net_device *dev;
- /* Pages making up the egress queue. */
- struct page *eq_pages;
- /* Address of the actual egress queue. */
- lepp_queue_t *eq;
- /* Protects "eq". */
- spinlock_t eq_lock;
- /* The hypervisor handle for this interface. */
- int hv_devhdl;
- /* The intr bit mask that IDs this device. */
- u32 intr_id;
- /* True iff "tile_net_open_aux()" has succeeded. */
- bool partly_opened;
- /* True iff the device is "active". */
- bool active;
- /* Effective network cpus. */
- struct cpumask network_cpus_map;
- /* Number of network cpus. */
- int network_cpus_count;
- /* Credits per network cpu. */
- int network_cpus_credits;
- /* For NetIO bringup retries. */
- struct delayed_work retry_work;
- /* Quick access to per cpu data. */
- struct tile_net_cpu *cpu[NR_CPUS];
-};
-
-/* Log2 of the number of small pages needed for the egress queue. */
-#define EQ_ORDER get_order(sizeof(lepp_queue_t))
-/* Size of the egress queue's pages. */
-#define EQ_SIZE (1 << (PAGE_SHIFT + EQ_ORDER))
-
-/*
- * The actual devices (xgbe0, xgbe1, gbe0, gbe1).
- */
-static struct net_device *tile_net_devs[TILE_NET_DEVS];
-
-/*
- * The "tile_net_cpu" structures for each device.
- */
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe0);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_xgbe1);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe0);
-static DEFINE_PER_CPU(struct tile_net_cpu, hv_gbe1);
-
-
-/*
- * True if "network_cpus" was specified.
- */
-static bool network_cpus_used;
-
-/*
- * The actual cpus in "network_cpus".
- */
-static struct cpumask network_cpus_map;
-
-
-
-#ifdef TILE_NET_DEBUG
-/*
- * printk with extra stuff.
- *
- * We print the CPU we're running in brackets.
- */
-static void net_printk(char *fmt, ...)
-{
- int i;
- int len;
- va_list args;
- static char buf[256];
-
- len = sprintf(buf, "tile_net[%2.2d]: ", smp_processor_id());
- va_start(args, fmt);
- i = vscnprintf(buf + len, sizeof(buf) - len - 1, fmt, args);
- va_end(args);
- buf[255] = '\0';
- pr_notice(buf);
-}
-#endif
-
-
-#ifdef TILE_NET_DUMP_PACKETS
-/*
- * Dump a packet.
- */
-static void dump_packet(unsigned char *data, unsigned long length, char *s)
-{
- int my_cpu = smp_processor_id();
-
- unsigned long i;
- char buf[128];
-
- static unsigned int count;
-
- pr_info("dump_packet(data %p, length 0x%lx s %s count 0x%x)\n",
- data, length, s, count++);
-
- pr_info("\n");
-
- for (i = 0; i < length; i++) {
- if ((i & 0xf) == 0)
- sprintf(buf, "[%02d] %8.8lx:", my_cpu, i);
- sprintf(buf + strlen(buf), " %2.2x", data[i]);
- if ((i & 0xf) == 0xf || i == length - 1) {
- strcat(buf, "\n");
- pr_info("%s", buf);
- }
- }
-}
-#endif
-
-
-/*
- * Provide support for the __netio_fastio1() swint
- * (see <hv/drv_xgbe_intf.h> for how it is used).
- *
- * The fastio swint2 call may clobber all the caller-saved registers.
- * It rarely clobbers memory, but we allow for the possibility in
- * the signature just to be on the safe side.
- *
- * Also, gcc doesn't seem to allow an input operand to be
- * clobbered, so we fake it with dummy outputs.
- *
- * This function can't be static because of the way it is declared
- * in the netio header.
- */
-inline int __netio_fastio1(u32 fastio_index, u32 arg0)
-{
- long result, clobber_r1, clobber_r10;
- asm volatile("swint2"
- : "=R00" (result),
- "=R01" (clobber_r1), "=R10" (clobber_r10)
- : "R10" (fastio_index), "R01" (arg0)
- : "memory", "r2", "r3", "r4",
- "r5", "r6", "r7", "r8", "r9",
- "r11", "r12", "r13", "r14",
- "r15", "r16", "r17", "r18", "r19",
- "r20", "r21", "r22", "r23", "r24",
- "r25", "r26", "r27", "r28", "r29");
- return result;
-}
-
-
-static void tile_net_return_credit(struct tile_net_cpu *info)
-{
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- /* Return four credits after every fourth packet. */
- if (--qup->__receive_credit_remaining == 0) {
- u32 interval = qup->__receive_credit_interval;
- qup->__receive_credit_remaining = interval;
- __netio_fastio_return_credits(qup->__fastio_index, interval);
- }
-}
-
-
-
-/*
- * Provide a linux buffer to LIPP.
- */
-static void tile_net_provide_linux_buffer(struct tile_net_cpu *info,
- void *va, bool small)
-{
- struct tile_netio_queue *queue = &info->queue;
-
- /* Convert "va" and "small" to "linux_buffer_t". */
- unsigned int buffer = ((unsigned int)(__pa(va) >> 7) << 1) + small;
-
- __netio_fastio_free_buffer(queue->__user_part.__fastio_index, buffer);
-}
-
-
-/*
- * Provide a linux buffer for LIPP.
- *
- * Note that the ACTUAL allocation for each buffer is a "struct sk_buff",
- * plus a chunk of memory that includes not only the requested bytes, but
- * also NET_SKB_PAD bytes of initial padding, and a "struct skb_shared_info".
- *
- * Note that "struct skb_shared_info" is 88 bytes with 64K pages and
- * 268 bytes with 4K pages (since the frags[] array needs 18 entries).
- *
- * Without jumbo packets, the maximum packet size will be 1536 bytes,
- * and we use 2 bytes (NET_IP_ALIGN) of padding. ISSUE: If we told
- * the hardware to clip at 1518 bytes instead of 1536 bytes, then we
- * could save an entire cache line, but in practice, we don't need it.
- *
- * Since CPAs are 38 bits, and we can only encode the high 31 bits in
- * a "linux_buffer_t", the low 7 bits must be zero, and thus, we must
- * align the actual "va" mod 128.
- *
- * We assume that the underlying "head" will be aligned mod 64. Note
- * that in practice, we have seen "head" NOT aligned mod 128 even when
- * using 2048 byte allocations, which is surprising.
- *
- * If "head" WAS always aligned mod 128, we could change LIPP to
- * assume that the low SIX bits are zero, and the 7th bit is one, that
- * is, align the actual "va" mod 128 plus 64, which would be "free".
- *
- * For now, the actual "head" pointer points at NET_SKB_PAD bytes of
- * padding, plus 28 or 92 bytes of extra padding, plus the sk_buff
- * pointer, plus the NET_IP_ALIGN padding, plus 126 or 1536 bytes for
- * the actual packet, plus 62 bytes of empty padding, plus some
- * padding and the "struct skb_shared_info".
- *
- * With 64K pages, a large buffer thus needs 32+92+4+2+1536+62+88
- * bytes, or 1816 bytes, which fits comfortably into 2048 bytes.
- *
- * With 64K pages, a small buffer thus needs 32+92+4+2+126+88
- * bytes, or 344 bytes, which means we are wasting 64+ bytes, and
- * could presumably increase the size of small buffers.
- *
- * With 4K pages, a large buffer thus needs 32+92+4+2+1536+62+268
- * bytes, or 1996 bytes, which fits comfortably into 2048 bytes.
- *
- * With 4K pages, a small buffer thus needs 32+92+4+2+126+268
- * bytes, or 524 bytes, which is annoyingly wasteful.
- *
- * Maybe we should increase LIPP_SMALL_PACKET_SIZE to 192?
- *
- * ISSUE: Maybe we should increase "NET_SKB_PAD" to 64?
- */
-static bool tile_net_provide_needed_buffer(struct tile_net_cpu *info,
- bool small)
-{
-#if TILE_NET_MTU <= 1536
- /* Without "jumbo", 2 + 1536 should be sufficient. */
- unsigned int large_size = NET_IP_ALIGN + 1536;
-#else
- /* ISSUE: This has not been tested. */
- unsigned int large_size = NET_IP_ALIGN + TILE_NET_MTU + 100;
-#endif
-
- /* Avoid "false sharing" with last cache line. */
- /* ISSUE: This is already done by "netdev_alloc_skb()". */
- unsigned int len =
- (((small ? LIPP_SMALL_PACKET_SIZE : large_size) +
- CHIP_L2_LINE_SIZE() - 1) & -CHIP_L2_LINE_SIZE());
-
- unsigned int padding = 128 - NET_SKB_PAD;
- unsigned int align;
-
- struct sk_buff *skb;
- void *va;
-
- struct sk_buff **skb_ptr;
-
- /* Request 96 extra bytes for alignment purposes. */
- skb = netdev_alloc_skb(info->napi.dev, len + padding);
- if (skb == NULL)
- return false;
-
- /* Skip 32 or 96 bytes to align "data" mod 128. */
- align = -(long)skb->data & (128 - 1);
- BUG_ON(align > padding);
- skb_reserve(skb, align);
-
- /* This address is given to IPP. */
- va = skb->data;
-
- /* Buffers must not span a huge page. */
- BUG_ON(((((long)va & ~HPAGE_MASK) + len) & HPAGE_MASK) != 0);
-
-#ifdef TILE_NET_PARANOIA
-#if CHIP_HAS_CBOX_HOME_MAP()
- if (hash_default) {
- HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)va);
- if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
- panic("Non-HFH ingress buffer! VA=%p Mode=%d PTE=%llx",
- va, hv_pte_get_mode(pte), hv_pte_val(pte));
- }
-#endif
-#endif
-
- /* Invalidate the packet buffer. */
- if (!hash_default)
- __inv_buffer(va, len);
-
- /* Skip two bytes to satisfy LIPP assumptions. */
- /* Note that this aligns IP on a 16 byte boundary. */
- /* ISSUE: Do this when the packet arrives? */
- skb_reserve(skb, NET_IP_ALIGN);
-
- /* Save a back-pointer to 'skb'. */
- skb_ptr = va - sizeof(*skb_ptr);
- *skb_ptr = skb;
-
- /* Make sure "skb_ptr" has been flushed. */
- __insn_mf();
-
- /* Provide the new buffer. */
- tile_net_provide_linux_buffer(info, va, small);
-
- return true;
-}
-
-
-/*
- * Provide linux buffers for LIPP.
- */
-static void tile_net_provide_needed_buffers(struct tile_net_cpu *info)
-{
- while (info->num_needed_small_buffers != 0) {
- if (!tile_net_provide_needed_buffer(info, true))
- goto oops;
- info->num_needed_small_buffers--;
- }
-
- while (info->num_needed_large_buffers != 0) {
- if (!tile_net_provide_needed_buffer(info, false))
- goto oops;
- info->num_needed_large_buffers--;
- }
-
- return;
-
-oops:
-
- /* Add a description to the page allocation failure dump. */
- pr_notice("Could not provide a linux buffer to LIPP.\n");
-}
-
-
-/*
- * Grab some LEPP completions, and store them in "comps", of size
- * "comps_size", and return the number of completions which were
- * stored, so the caller can free them.
- */
-static unsigned int tile_net_lepp_grab_comps(lepp_queue_t *eq,
- struct sk_buff *comps[],
- unsigned int comps_size,
- unsigned int min_size)
-{
- unsigned int n = 0;
-
- unsigned int comp_head = eq->comp_head;
- unsigned int comp_busy = eq->comp_busy;
-
- while (comp_head != comp_busy && n < comps_size) {
- comps[n++] = eq->comps[comp_head];
- LEPP_QINC(comp_head);
- }
-
- if (n < min_size)
- return 0;
-
- eq->comp_head = comp_head;
-
- return n;
-}
-
-
-/*
- * Free some comps, and return true iff there are still some pending.
- */
-static bool tile_net_lepp_free_comps(struct net_device *dev, bool all)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[64];
- unsigned int wanted = 64;
- unsigned int i, n;
- bool pending;
-
- spin_lock(&priv->eq_lock);
-
- if (all)
- eq->comp_busy = eq->comp_tail;
-
- n = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
-
- pending = (eq->comp_head != eq->comp_tail);
-
- spin_unlock(&priv->eq_lock);
-
- for (i = 0; i < n; i++)
- kfree_skb(olds[i]);
-
- return pending;
-}
-
-
-/*
- * Make sure the egress timer is scheduled.
- *
- * Note that we use "schedule if not scheduled" logic instead of the more
- * obvious "reschedule" logic, because "reschedule" is fairly expensive.
- */
-static void tile_net_schedule_egress_timer(struct tile_net_cpu *info)
-{
- if (!info->egress_timer_scheduled) {
- mod_timer(&info->egress_timer, jiffies + 1);
- info->egress_timer_scheduled = true;
- }
-}
-
-
-/*
- * The "function" for "info->egress_timer".
- *
- * This timer will reschedule itself as long as there are any pending
- * completions expected (on behalf of any tile).
- *
- * ISSUE: Realistically, will the timer ever stop scheduling itself?
- *
- * ISSUE: This timer is almost never actually needed, so just use a global
- * timer that can run on any tile.
- *
- * ISSUE: Maybe instead track number of expected completions, and free
- * only that many, resetting to zero if "pending" is ever false.
- */
-static void tile_net_handle_egress_timer(struct timer_list *t)
-{
- struct tile_net_cpu *info = from_timer(info, t, egress_timer);
- struct net_device *dev = info->napi.dev;
-
- /* The timer is no longer scheduled. */
- info->egress_timer_scheduled = false;
-
- /* Free comps, and reschedule timer if more are pending. */
- if (tile_net_lepp_free_comps(dev, false))
- tile_net_schedule_egress_timer(info);
-}
-
-
-static void tile_net_discard_aux(struct tile_net_cpu *info, int index)
-{
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- int index2_aux = index + sizeof(netio_pkt_t);
- int index2 =
- ((index2_aux ==
- qsp->__packet_receive_queue.__last_packet_plus_one) ?
- 0 : index2_aux);
-
- netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
-
- /* Extract the "linux_buffer_t". */
- unsigned int buffer = pkt->__packet.word;
-
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- kfree_skb(skb);
-
- /* Consume this packet. */
- qup->__packet_receive_read = index2;
-}
-
-
-/*
- * Like "tile_net_poll()", but just discard packets.
- */
-static void tile_net_discard_packets(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- while (qup->__packet_receive_read !=
- qsp->__packet_receive_queue.__packet_write) {
- int index = qup->__packet_receive_read;
- tile_net_discard_aux(info, index);
- }
-}
-
-
-/*
- * Handle the next packet. Return true if "processed", false if "filtered".
- */
-static bool tile_net_poll_aux(struct tile_net_cpu *info, int index)
-{
- struct net_device *dev = info->napi.dev;
-
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
- struct tile_net_stats_t *stats = &info->stats;
-
- int filter;
-
- int index2_aux = index + sizeof(netio_pkt_t);
- int index2 =
- ((index2_aux ==
- qsp->__packet_receive_queue.__last_packet_plus_one) ?
- 0 : index2_aux);
-
- netio_pkt_t *pkt = (netio_pkt_t *)((unsigned long) &qsp[1] + index);
-
- netio_pkt_metadata_t *metadata = NETIO_PKT_METADATA(pkt);
- netio_pkt_status_t pkt_status = NETIO_PKT_STATUS_M(metadata, pkt);
-
- /* Extract the packet size. FIXME: Shouldn't the second line */
- /* get subtracted? Mostly moot, since it should be "zero". */
- unsigned long len =
- (NETIO_PKT_CUSTOM_LENGTH(pkt) +
- NET_IP_ALIGN - NETIO_PACKET_PADDING);
-
- /* Extract the "linux_buffer_t". */
- unsigned int buffer = pkt->__packet.word;
-
- /* Extract "small" (vs "large"). */
- bool small = ((buffer & 1) != 0);
-
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Extract the packet data pointer. */
- /* Compare to "NETIO_PKT_CUSTOM_DATA(pkt)". */
- unsigned char *buf = va + NET_IP_ALIGN;
-
- /* Invalidate the packet buffer. */
- if (!hash_default)
- __inv_buffer(buf, len);
-
-#ifdef TILE_NET_DUMP_PACKETS
- dump_packet(buf, len, "rx");
-#endif /* TILE_NET_DUMP_PACKETS */
-
-#ifdef TILE_NET_VERIFY_INGRESS
- if (pkt_status == NETIO_PKT_STATUS_OVERSIZE && len >= 64) {
- dump_packet(buf, len, "rx");
- panic("Unexpected OVERSIZE.");
- }
-#endif
-
- filter = 0;
-
- if (pkt_status == NETIO_PKT_STATUS_BAD) {
- /* Handle CRC error and hardware truncation. */
- filter = 2;
- } else if (!(dev->flags & IFF_UP)) {
- /* Filter packets received before we're up. */
- filter = 1;
- } else if (NETIO_PKT_ETHERTYPE_RECOGNIZED_M(metadata, pkt) &&
- pkt_status == NETIO_PKT_STATUS_UNDERSIZE) {
- /* Filter "truncated" packets. */
- filter = 2;
- } else if (!(dev->flags & IFF_PROMISC)) {
- if (!is_multicast_ether_addr(buf)) {
- /* Filter packets not for our address. */
- const u8 *mine = dev->dev_addr;
- filter = !ether_addr_equal(mine, buf);
- }
- }
-
- u64_stats_update_begin(&stats->syncp);
-
- if (filter != 0) {
-
- if (filter == 1)
- stats->rx_dropped++;
- else
- stats->rx_errors++;
-
- tile_net_provide_linux_buffer(info, va, small);
-
- } else {
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- /* Paranoia. */
- if (skb->data != buf)
- panic("Corrupt linux buffer from LIPP! "
- "VA=%p, skb=%p, skb->data=%p\n",
- va, skb, skb->data);
-
- /* Encode the actual packet length. */
- skb_put(skb, len);
-
- /* NOTE: This call also sets "skb->dev = dev". */
- skb->protocol = eth_type_trans(skb, dev);
-
- /* Avoid recomputing "good" TCP/UDP checksums. */
- if (NETIO_PKT_L4_CSUM_CORRECT_M(metadata, pkt))
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- netif_receive_skb(skb);
-
- stats->rx_packets++;
- stats->rx_bytes += len;
- }
-
- u64_stats_update_end(&stats->syncp);
-
- /* ISSUE: It would be nice to defer this until the packet has */
- /* actually been processed. */
- tile_net_return_credit(info);
-
- /* Consume this packet. */
- qup->__packet_receive_read = index2;
-
- return !filter;
-}
-
-
-/*
- * Handle some packets for the given device on the current CPU.
- *
- * If "tile_net_stop()" is called on some other tile while this
- * function is running, we will return, hopefully before that
- * other tile asks us to call "napi_disable()".
- *
- * The "rotting packet" race condition occurs if a packet arrives
- * during the extremely narrow window between the queue appearing to
- * be empty, and the ingress interrupt being re-enabled. This happens
- * a LOT under heavy network load.
- */
-static int tile_net_poll(struct napi_struct *napi, int budget)
-{
- struct net_device *dev = napi->dev;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_impl_t *qsp = queue->__system_part;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- unsigned int work = 0;
-
- if (budget <= 0)
- goto done;
-
- while (priv->active) {
- int index = qup->__packet_receive_read;
- if (index == qsp->__packet_receive_queue.__packet_write)
- break;
-
- if (tile_net_poll_aux(info, index)) {
- if (++work >= budget)
- goto done;
- }
- }
-
- napi_complete_done(&info->napi, work);
-
- if (!priv->active)
- goto done;
-
- /* Re-enable the ingress interrupt. */
- enable_percpu_irq(priv->intr_id, 0);
-
- /* HACK: Avoid the "rotting packet" problem (see above). */
- if (qup->__packet_receive_read !=
- qsp->__packet_receive_queue.__packet_write) {
- /* ISSUE: Sometimes this returns zero, presumably */
- /* because an interrupt was handled for this tile. */
- (void)napi_reschedule(&info->napi);
- }
-
-done:
-
- if (priv->active)
- tile_net_provide_needed_buffers(info);
-
- return work;
-}
-
-
-/*
- * Handle an ingress interrupt for the given device on the current cpu.
- *
- * ISSUE: Sometimes this gets called after "disable_percpu_irq()" has
- * been called! This is probably due to "pending hypervisor downcalls".
- *
- * ISSUE: Is there any race condition between the "napi_schedule()" here
- * and the "napi_complete()" call above?
- */
-static irqreturn_t tile_net_handle_ingress_interrupt(int irq, void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Ignore unwanted interrupts. */
- if (!priv->active)
- return IRQ_HANDLED;
-
- /* ISSUE: Sometimes "info->napi_enabled" is false here. */
-
- napi_schedule(&info->napi);
-
- return IRQ_HANDLED;
-}
-
-
-/*
- * One time initialization per interface.
- */
-static int tile_net_open_aux(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- int ret;
- int dummy;
- unsigned int epp_lotar;
-
- /*
- * Find out where EPP memory should be homed.
- */
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&epp_lotar, sizeof(epp_lotar),
- NETIO_EPP_SHM_OFF);
- if (ret < 0) {
- pr_err("could not read epp_shm_queue lotar.\n");
- return -EIO;
- }
-
- /*
- * Home the page on the EPP.
- */
- {
- int epp_home = hv_lotar_to_cpu(epp_lotar);
- homecache_change_page_home(priv->eq_pages, EQ_ORDER, epp_home);
- }
-
- /*
- * Register the EPP shared memory queue.
- */
- {
- netio_ipp_address_t ea = {
- .va = 0,
- .pa = __pa(priv->eq),
- .pte = hv_pte(0),
- .size = EQ_SIZE,
- };
- ea.pte = hv_pte_set_lotar(ea.pte, epp_lotar);
- ea.pte = hv_pte_set_mode(ea.pte, HV_PTE_MODE_CACHE_TILE_L3);
- ret = hv_dev_pwrite(priv->hv_devhdl, 0,
- (HV_VirtAddr)&ea,
- sizeof(ea),
- NETIO_EPP_SHM_OFF);
- if (ret < 0)
- return -EIO;
- }
-
- /*
- * Start LIPP/LEPP.
- */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_START_SHIM_OFF) < 0) {
- pr_warn("Failed to start LIPP/LEPP\n");
- return -EIO;
- }
-
- return 0;
-}
-
-
-/*
- * Register with hypervisor on the current CPU.
- *
- * Strangely, this function does important things even if it "fails",
- * which is especially common if the link is not up yet. Hopefully
- * these things are all "harmless" if done twice!
- */
-static void tile_net_register(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info;
-
- struct tile_netio_queue *queue;
-
- /* Only network cpus can receive packets. */
- int queue_id =
- cpumask_test_cpu(my_cpu, &priv->network_cpus_map) ? 0 : 255;
-
- netio_input_config_t config = {
- .flags = 0,
- .num_receive_packets = priv->network_cpus_credits,
- .queue_id = queue_id
- };
-
- int ret = 0;
- netio_queue_impl_t *queuep;
-
- PDEBUG("tile_net_register(queue_id %d)\n", queue_id);
-
- if (!strcmp(dev->name, "xgbe0"))
- info = this_cpu_ptr(&hv_xgbe0);
- else if (!strcmp(dev->name, "xgbe1"))
- info = this_cpu_ptr(&hv_xgbe1);
- else if (!strcmp(dev->name, "gbe0"))
- info = this_cpu_ptr(&hv_gbe0);
- else if (!strcmp(dev->name, "gbe1"))
- info = this_cpu_ptr(&hv_gbe1);
- else
- BUG();
-
- /* Initialize the egress timer. */
- timer_setup(&info->egress_timer, tile_net_handle_egress_timer,
- TIMER_PINNED);
-
- u64_stats_init(&info->stats.syncp);
-
- priv->cpu[my_cpu] = info;
-
- /*
- * Register ourselves with LIPP. This does a lot of stuff,
- * including invoking the LIPP registration code.
- */
- ret = hv_dev_pwrite(priv->hv_devhdl, 0,
- (HV_VirtAddr)&config,
- sizeof(netio_input_config_t),
- NETIO_IPP_INPUT_REGISTER_OFF);
- PDEBUG("hv_dev_pwrite(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
- ret);
- if (ret < 0) {
- if (ret != NETIO_LINK_DOWN) {
- printk(KERN_DEBUG "hv_dev_pwrite "
- "NETIO_IPP_INPUT_REGISTER_OFF failure %d\n",
- ret);
- }
- info->link_down = (ret == NETIO_LINK_DOWN);
- return;
- }
-
- /*
- * Get the pointer to our queue's system part.
- */
-
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&queuep,
- sizeof(netio_queue_impl_t *),
- NETIO_IPP_INPUT_REGISTER_OFF);
- PDEBUG("hv_dev_pread(NETIO_IPP_INPUT_REGISTER_OFF) returned %d\n",
- ret);
- PDEBUG("queuep %p\n", queuep);
- if (ret <= 0) {
- /* ISSUE: Shouldn't this be a fatal error? */
- pr_err("hv_dev_pread NETIO_IPP_INPUT_REGISTER_OFF failure\n");
- return;
- }
-
- queue = &info->queue;
-
- queue->__system_part = queuep;
-
- memset(&queue->__user_part, 0, sizeof(netio_queue_user_impl_t));
-
- /* This is traditionally "config.num_receive_packets / 2". */
- queue->__user_part.__receive_credit_interval = 4;
- queue->__user_part.__receive_credit_remaining =
- queue->__user_part.__receive_credit_interval;
-
- /*
- * Get a fastio index from the hypervisor.
- * ISSUE: Shouldn't this check the result?
- */
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)&queue->__user_part.__fastio_index,
- sizeof(queue->__user_part.__fastio_index),
- NETIO_IPP_GET_FASTIO_OFF);
- PDEBUG("hv_dev_pread(NETIO_IPP_GET_FASTIO_OFF) returned %d\n", ret);
-
- /* Now we are registered. */
- info->registered = true;
-}
-
-
-/*
- * Deregister with hypervisor on the current CPU.
- *
- * This simply discards all our credits, so no more packets will be
- * delivered to this tile. There may still be packets in our queue.
- *
- * Also, disable the ingress interrupt.
- */
-static void tile_net_deregister(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Do nothing else if not registered. */
- if (info == NULL || !info->registered)
- return;
-
- {
- struct tile_netio_queue *queue = &info->queue;
- netio_queue_user_impl_t *qup = &queue->__user_part;
-
- /* Discard all our credits. */
- __netio_fastio_return_credits(qup->__fastio_index, -1);
- }
-}
-
-
-/*
- * Unregister with hypervisor on the current CPU.
- *
- * Also, disable the ingress interrupt.
- */
-static void tile_net_unregister(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- int ret;
- int dummy = 0;
-
- /* Disable the ingress interrupt. */
- disable_percpu_irq(priv->intr_id);
-
- /* Do nothing else if not registered. */
- if (info == NULL || !info->registered)
- return;
-
- /* Unregister ourselves with LIPP/LEPP. */
- ret = hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_INPUT_UNREGISTER_OFF);
- if (ret < 0)
- panic("Failed to unregister with LIPP/LEPP!\n");
-
- /* Discard all packets still in our NetIO queue. */
- tile_net_discard_packets(dev);
-
- /* Reset state. */
- info->num_needed_small_buffers = 0;
- info->num_needed_large_buffers = 0;
-
- /* Cancel egress timer. */
- del_timer(&info->egress_timer);
- info->egress_timer_scheduled = false;
-}
-
-
-/*
- * Helper function for "tile_net_stop()".
- *
- * Also used to handle registration failure in "tile_net_open_inner()",
- * when the various extra steps in "tile_net_stop()" are not necessary.
- */
-static void tile_net_stop_aux(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int i;
-
- int dummy = 0;
-
- /*
- * Unregister all tiles, so LIPP will stop delivering packets.
- * Also, delete all the "napi" objects (sequentially, to protect
- * "dev->napi_list").
- */
- on_each_cpu(tile_net_unregister, (void *)dev, 1);
- for_each_online_cpu(i) {
- struct tile_net_cpu *info = priv->cpu[i];
- if (info != NULL && info->registered) {
- netif_napi_del(&info->napi);
- info->registered = false;
- }
- }
-
- /* Stop LIPP/LEPP. */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_STOP_SHIM_OFF) < 0)
- panic("Failed to stop LIPP/LEPP!\n");
-
- priv->partly_opened = false;
-}
-
-
-/*
- * Disable NAPI for the given device on the current cpu.
- */
-static void tile_net_stop_disable(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Disable NAPI if needed. */
- if (info != NULL && info->napi_enabled) {
- napi_disable(&info->napi);
- info->napi_enabled = false;
- }
-}
-
-
-/*
- * Enable NAPI and the ingress interrupt for the given device
- * on the current cpu.
- *
- * ISSUE: Only do this for "network cpus"?
- */
-static void tile_net_open_enable(void *dev_ptr)
-{
- struct net_device *dev = (struct net_device *)dev_ptr;
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
-
- /* Enable NAPI. */
- napi_enable(&info->napi);
- info->napi_enabled = true;
-
- /* Enable the ingress interrupt. */
- enable_percpu_irq(priv->intr_id, 0);
-}
-
-
-/*
- * tile_net_open_inner does most of the work of bringing up the interface.
- * It's called from tile_net_open(), and also from tile_net_retry_open().
- * The return value is 0 if the interface was brought up, < 0 if
- * tile_net_open() should return the return value as an error, and > 0 if
- * tile_net_open() should return success and schedule a work item to
- * periodically retry the bringup.
- */
-static int tile_net_open_inner(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info;
- struct tile_netio_queue *queue;
- int result = 0;
- int i;
- int dummy = 0;
-
- /*
- * First try to register just on the local CPU, and handle any
- * semi-expected "link down" failure specially. Note that we
- * do NOT call "tile_net_stop_aux()", unlike below.
- */
- tile_net_register(dev);
- info = priv->cpu[my_cpu];
- if (!info->registered) {
- if (info->link_down)
- return 1;
- return -EAGAIN;
- }
-
- /*
- * Now register everywhere else. If any registration fails,
- * even for "link down" (which might not be possible), we
- * clean up using "tile_net_stop_aux()". Also, add all the
- * "napi" objects (sequentially, to protect "dev->napi_list").
- * ISSUE: Only use "netif_napi_add()" for "network cpus"?
- */
- smp_call_function(tile_net_register, (void *)dev, 1);
- for_each_online_cpu(i) {
- struct tile_net_cpu *info = priv->cpu[i];
- if (info->registered)
- netif_napi_add(dev, &info->napi, tile_net_poll, 64);
- else
- result = -EAGAIN;
- }
- if (result != 0) {
- tile_net_stop_aux(dev);
- return result;
- }
-
- queue = &info->queue;
-
- if (priv->intr_id == 0) {
- unsigned int irq;
-
- /*
- * Acquire the irq allocated by the hypervisor. Every
- * queue gets the same irq. The "__intr_id" field is
- * "1 << irq", so we use "__ffs()" to extract "irq".
- */
- priv->intr_id = queue->__system_part->__intr_id;
- BUG_ON(priv->intr_id == 0);
- irq = __ffs(priv->intr_id);
-
- /*
- * Register the ingress interrupt handler for this
- * device, permanently.
- *
- * We used to call "free_irq()" in "tile_net_stop()",
- * and then re-register the handler here every time,
- * but that caused DNP errors in "handle_IRQ_event()"
- * because "desc->action" was NULL. See bug 9143.
- */
- tile_irq_activate(irq, TILE_IRQ_PERCPU);
- BUG_ON(request_irq(irq, tile_net_handle_ingress_interrupt,
- 0, dev->name, (void *)dev) != 0);
- }
-
- {
- /* Allocate initial buffers. */
-
- int max_buffers =
- priv->network_cpus_count * priv->network_cpus_credits;
-
- info->num_needed_small_buffers =
- min(LIPP_SMALL_BUFFERS, max_buffers);
-
- info->num_needed_large_buffers =
- min(LIPP_LARGE_BUFFERS, max_buffers);
-
- tile_net_provide_needed_buffers(info);
-
- if (info->num_needed_small_buffers != 0 ||
- info->num_needed_large_buffers != 0)
- panic("Insufficient memory for buffer stack!");
- }
-
- /* We are about to be active. */
- priv->active = true;
-
- /* Make sure "active" is visible to all tiles. */
- mb();
-
- /* On each tile, enable NAPI and the ingress interrupt. */
- on_each_cpu(tile_net_open_enable, (void *)dev, 1);
-
- /* Start LIPP/LEPP and activate "ingress" at the shim. */
- if (hv_dev_pwrite(priv->hv_devhdl, 0, (HV_VirtAddr)&dummy,
- sizeof(dummy), NETIO_IPP_INPUT_INIT_OFF) < 0)
- panic("Failed to activate the LIPP Shim!\n");
-
- /* Start our transmit queue. */
- netif_start_queue(dev);
-
- return 0;
-}
-
-
-/*
- * Called periodically to retry bringing up the NetIO interface,
- * if it doesn't come up cleanly during tile_net_open().
- */
-static void tile_net_open_retry(struct work_struct *w)
-{
- struct delayed_work *dw = to_delayed_work(w);
-
- struct tile_net_priv *priv =
- container_of(dw, struct tile_net_priv, retry_work);
-
- /*
- * Try to bring the NetIO interface up. If it fails, reschedule
- * ourselves to try again later; otherwise, tell Linux we now have
- * a working link. ISSUE: What if the return value is negative?
- */
- if (tile_net_open_inner(priv->dev) != 0)
- schedule_delayed_work(&priv->retry_work,
- TILE_NET_RETRY_INTERVAL);
- else
- netif_carrier_on(priv->dev);
-}
-
-
-/*
- * Called when a network interface is made active.
- *
- * Returns 0 on success, negative value on failure.
- *
- * The open entry point is called when a network interface is made
- * active by the system (IFF_UP). At this point all resources needed
- * for transmit and receive operations are allocated, the interrupt
- * handler is registered with the OS (if needed), the watchdog timer
- * is started, and the stack is notified that the interface is ready.
- *
- * If the actual link is not available yet, then we tell Linux that
- * we have no carrier, and we keep checking until the link comes up.
- */
-static int tile_net_open(struct net_device *dev)
-{
- int ret = 0;
- struct tile_net_priv *priv = netdev_priv(dev);
-
- /*
- * We rely on priv->partly_opened to tell us if this is the
- * first time this interface is being brought up. If it is
- * set, the IPP was already initialized and should not be
- * initialized again.
- */
- if (!priv->partly_opened) {
-
- int count;
- int credits;
-
- /* Initialize LIPP/LEPP, and start the Shim. */
- ret = tile_net_open_aux(dev);
- if (ret < 0) {
- pr_err("tile_net_open_aux failed: %d\n", ret);
- return ret;
- }
-
- /* Analyze the network cpus. */
-
- if (network_cpus_used)
- cpumask_copy(&priv->network_cpus_map,
- &network_cpus_map);
- else
- cpumask_copy(&priv->network_cpus_map, cpu_online_mask);
-
-
- count = cpumask_weight(&priv->network_cpus_map);
-
- /* Limit credits to available buffers, and apply min. */
- credits = max(16, (LIPP_LARGE_BUFFERS / count) & ~1);
-
- /* Apply "GBE" max limit. */
- /* ISSUE: Use higher limit for XGBE? */
- credits = min(NETIO_MAX_RECEIVE_PKTS, credits);
-
- priv->network_cpus_count = count;
- priv->network_cpus_credits = credits;
-
-#ifdef TILE_NET_DEBUG
- pr_info("Using %d network cpus, with %d credits each\n",
- priv->network_cpus_count, priv->network_cpus_credits);
-#endif
-
- priv->partly_opened = true;
-
- } else {
- /* FIXME: Is this possible? */
- /* printk("Already partly opened.\n"); */
- }
-
- /*
- * Attempt to bring up the link.
- */
- ret = tile_net_open_inner(dev);
- if (ret <= 0) {
- if (ret == 0)
- netif_carrier_on(dev);
- return ret;
- }
-
- /*
- * We were unable to bring up the NetIO interface, but we want to
- * try again in a little bit. Tell Linux that we have no carrier
- * so it doesn't try to use the interface before the link comes up
- * and then remember to try again later.
- */
- netif_carrier_off(dev);
- schedule_delayed_work(&priv->retry_work, TILE_NET_RETRY_INTERVAL);
-
- return 0;
-}
-
-
-static int tile_net_drain_lipp_buffers(struct tile_net_priv *priv)
-{
- int n = 0;
-
- /* Drain all the LIPP buffers. */
- while (true) {
- unsigned int buffer;
-
- /* NOTE: This should never fail. */
- if (hv_dev_pread(priv->hv_devhdl, 0, (HV_VirtAddr)&buffer,
- sizeof(buffer), NETIO_IPP_DRAIN_OFF) < 0)
- break;
-
- /* Stop when done. */
- if (buffer == 0)
- break;
-
- {
- /* Convert "linux_buffer_t" to "va". */
- void *va = __va((phys_addr_t)(buffer >> 1) << 7);
-
- /* Acquire the associated "skb". */
- struct sk_buff **skb_ptr = va - sizeof(*skb_ptr);
- struct sk_buff *skb = *skb_ptr;
-
- kfree_skb(skb);
- }
-
- n++;
- }
-
- return n;
-}
-
-
-/*
- * Disables a network interface.
- *
- * Returns 0, this is not allowed to fail.
- *
- * The close entry point is called when an interface is de-activated
- * by the OS. The hardware is still under the drivers control, but
- * needs to be disabled. A global MAC reset is issued to stop the
- * hardware, and all transmit and receive resources are freed.
- *
- * ISSUE: How closely does "netif_running(dev)" mirror "priv->active"?
- *
- * Before we are called by "__dev_close()", "netif_running()" will
- * have been cleared, so no NEW calls to "tile_net_poll()" will be
- * made by "netpoll_poll_dev()".
- *
- * Often, this can cause some tiles to still have packets in their
- * queues, so we must call "tile_net_discard_packets()" later.
- *
- * Note that some other tile may still be INSIDE "tile_net_poll()",
- * and in fact, many will be, if there is heavy network load.
- *
- * Calling "on_each_cpu(tile_net_stop_disable, (void *)dev, 1)" when
- * any tile is still "napi_schedule()"'d will induce a horrible crash
- * when "msleep()" is called. This includes tiles which are inside
- * "tile_net_poll()" which have not yet called "napi_complete()".
- *
- * So, we must first try to wait long enough for other tiles to finish
- * with any current "tile_net_poll()" call, and, hopefully, to clear
- * the "scheduled" flag. ISSUE: It is unclear what happens to tiles
- * which have called "napi_schedule()" but which had not yet tried to
- * call "tile_net_poll()", or which exhausted their budget inside
- * "tile_net_poll()" just before this function was called.
- */
-static int tile_net_stop(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- PDEBUG("tile_net_stop()\n");
-
- /* Start discarding packets. */
- priv->active = false;
-
- /* Make sure "active" is visible to all tiles. */
- mb();
-
- /*
- * On each tile, make sure no NEW packets get delivered, and
- * disable the ingress interrupt.
- *
- * Note that the ingress interrupt can fire AFTER this,
- * presumably due to packets which were recently delivered,
- * but it will have no effect.
- */
- on_each_cpu(tile_net_deregister, (void *)dev, 1);
-
- /* Optimistically drain LIPP buffers. */
- (void)tile_net_drain_lipp_buffers(priv);
-
- /* ISSUE: Only needed if not yet fully open. */
- cancel_delayed_work_sync(&priv->retry_work);
-
- /* Can't transmit any more. */
- netif_stop_queue(dev);
-
- /* Disable NAPI on each tile. */
- on_each_cpu(tile_net_stop_disable, (void *)dev, 1);
-
- /*
- * Drain any remaining LIPP buffers. NOTE: This "printk()"
- * has never been observed, but in theory it could happen.
- */
- if (tile_net_drain_lipp_buffers(priv) != 0)
- printk("Had to drain some extra LIPP buffers!\n");
-
- /* Stop LIPP/LEPP. */
- tile_net_stop_aux(dev);
-
- /*
- * ISSUE: It appears that, in practice anyway, by the time we
- * get here, there are no pending completions, but just in case,
- * we free (all of) them anyway.
- */
- while (tile_net_lepp_free_comps(dev, true))
- /* loop */;
-
- /* Wipe the EPP queue, and wait till the stores hit the EPP. */
- memset(priv->eq, 0, sizeof(lepp_queue_t));
- mb();
-
- return 0;
-}
-
-
-/*
- * Prepare the "frags" info for the resulting LEPP command.
- *
- * If needed, flush the memory used by the frags.
- */
-static unsigned int tile_net_tx_frags(lepp_frag_t *frags,
- struct sk_buff *skb,
- void *b_data, unsigned int b_len)
-{
- unsigned int i, n = 0;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- phys_addr_t cpa;
-
- if (b_len != 0) {
-
- if (!hash_default)
- finv_buffer_remote(b_data, b_len, 0);
-
- cpa = __pa(b_data);
- frags[n].cpa_lo = cpa;
- frags[n].cpa_hi = cpa >> 32;
- frags[n].length = b_len;
- frags[n].hash_for_home = hash_default;
- n++;
- }
-
- for (i = 0; i < sh->nr_frags; i++) {
-
- skb_frag_t *f = &sh->frags[i];
- unsigned long pfn = page_to_pfn(skb_frag_page(f));
-
- /* FIXME: Compute "hash_for_home" properly. */
- /* ISSUE: The hypervisor checks CHIP_HAS_REV1_DMA_PACKETS(). */
- int hash_for_home = hash_default;
-
- /* FIXME: Hmmm. */
- if (!hash_default) {
- void *va = pfn_to_kaddr(pfn) + f->page_offset;
- BUG_ON(PageHighMem(skb_frag_page(f)));
- finv_buffer_remote(va, skb_frag_size(f), 0);
- }
-
- cpa = ((phys_addr_t)pfn << PAGE_SHIFT) + f->page_offset;
- frags[n].cpa_lo = cpa;
- frags[n].cpa_hi = cpa >> 32;
- frags[n].length = skb_frag_size(f);
- frags[n].hash_for_home = hash_for_home;
- n++;
- }
-
- return n;
-}
-
-
-/*
- * This function takes "skb", consisting of a header template and a
- * payload, and hands it to LEPP, to emit as one or more segments,
- * each consisting of a possibly modified header, plus a piece of the
- * payload, via a process known as "tcp segmentation offload".
- *
- * Usually, "data" will contain the header template, of size "sh_len",
- * and "sh->frags" will contain "skb->data_len" bytes of payload, and
- * there will be "sh->gso_segs" segments.
- *
- * Sometimes, if "sendfile()" requires copying, we will be called with
- * "data" containing the header and payload, with "frags" being empty.
- *
- * Sometimes, for example when using NFS over TCP, a single segment can
- * span 3 fragments, which must be handled carefully in LEPP.
- *
- * See "emulate_large_send_offload()" for some reference code, which
- * does not handle checksumming.
- *
- * ISSUE: How do we make sure that high memory DMA does not migrate?
- */
-static int tile_net_tx_tso(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_net_stats_t *stats = &info->stats;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- unsigned char *data = skb->data;
-
- /* The ip header follows the ethernet header. */
- struct iphdr *ih = ip_hdr(skb);
- unsigned int ih_len = ih->ihl * 4;
-
- /* Note that "nh == ih", by definition. */
- unsigned char *nh = skb_network_header(skb);
- unsigned int eh_len = nh - data;
-
- /* The tcp header follows the ip header. */
- struct tcphdr *th = (struct tcphdr *)(nh + ih_len);
- unsigned int th_len = th->doff * 4;
-
- /* The total number of header bytes. */
- /* NOTE: This may be less than skb_headlen(skb). */
- unsigned int sh_len = eh_len + ih_len + th_len;
-
- /* The number of payload bytes at "skb->data + sh_len". */
- /* This is non-zero for sendfile() without HIGHDMA. */
- unsigned int b_len = skb_headlen(skb) - sh_len;
-
- /* The total number of payload bytes. */
- unsigned int d_len = b_len + skb->data_len;
-
- /* The maximum payload size. */
- unsigned int p_len = sh->gso_size;
-
- /* The total number of segments. */
- unsigned int num_segs = sh->gso_segs;
-
- /* The temporary copy of the command. */
- u32 cmd_body[(LEPP_MAX_CMD_SIZE + 3) / 4];
- lepp_tso_cmd_t *cmd = (lepp_tso_cmd_t *)cmd_body;
-
- /* Analyze the "frags". */
- unsigned int num_frags =
- tile_net_tx_frags(cmd->frags, skb, data + sh_len, b_len);
-
- /* The size of the command, including frags and header. */
- size_t cmd_size = LEPP_TSO_CMD_SIZE(num_frags, sh_len);
-
- /* The command header. */
- lepp_tso_cmd_t cmd_init = {
- .tso = true,
- .header_size = sh_len,
- .ip_offset = eh_len,
- .tcp_offset = eh_len + ih_len,
- .payload_size = p_len,
- .num_frags = num_frags,
- };
-
- unsigned long irqflags;
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[8];
- unsigned int wanted = 8;
- unsigned int i, nolds = 0;
-
- unsigned int cmd_head, cmd_tail, cmd_next;
- unsigned int comp_tail;
-
-
- /* Paranoia. */
- BUG_ON(skb->protocol != htons(ETH_P_IP));
- BUG_ON(ih->protocol != IPPROTO_TCP);
- BUG_ON(skb->ip_summed != CHECKSUM_PARTIAL);
- BUG_ON(num_frags > LEPP_MAX_FRAGS);
- /*--BUG_ON(num_segs != (d_len + (p_len - 1)) / p_len); */
- BUG_ON(num_segs <= 1);
-
-
- /* Finish preparing the command. */
-
- /* Copy the command header. */
- *cmd = cmd_init;
-
- /* Copy the "header". */
- memcpy(&cmd->frags[num_frags], data, sh_len);
-
-
- /* Prefetch and wait, to minimize time spent holding the spinlock. */
- prefetch_L1(&eq->comp_tail);
- prefetch_L1(&eq->cmd_tail);
- mb();
-
-
- /* Enqueue the command. */
-
- spin_lock_irqsave(&priv->eq_lock, irqflags);
-
- /* Handle completions if needed to make room. */
- /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
- if (lepp_num_free_comp_slots(eq) == 0) {
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
- if (nolds == 0) {
-busy:
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
- return NETDEV_TX_BUSY;
- }
- }
-
- cmd_head = eq->cmd_head;
- cmd_tail = eq->cmd_tail;
-
- /* Prepare to advance, detecting full queue. */
- /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
- cmd_next = cmd_tail + cmd_size;
- if (cmd_tail < cmd_head && cmd_next >= cmd_head)
- goto busy;
- if (cmd_next > LEPP_CMD_LIMIT) {
- cmd_next = 0;
- if (cmd_next == cmd_head)
- goto busy;
- }
-
- /* Copy the command. */
- memcpy(&eq->cmds[cmd_tail], cmd, cmd_size);
-
- /* Advance. */
- cmd_tail = cmd_next;
-
- /* Record "skb" for eventual freeing. */
- comp_tail = eq->comp_tail;
- eq->comps[comp_tail] = skb;
- LEPP_QINC(comp_tail);
- eq->comp_tail = comp_tail;
-
- /* Flush before allowing LEPP to handle the command. */
- /* ISSUE: Is this the optimal location for the flush? */
- __insn_mf();
-
- eq->cmd_tail = cmd_tail;
-
- /* NOTE: Using "4" here is more efficient than "0" or "2", */
- /* and, strangely, more efficient than pre-checking the number */
- /* of available completions, and comparing it to 4. */
- if (nolds == 0)
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
- /* Handle completions. */
- for (i = 0; i < nolds; i++)
- dev_consume_skb_any(olds[i]);
-
- /* Update stats. */
- u64_stats_update_begin(&stats->syncp);
- stats->tx_packets += num_segs;
- stats->tx_bytes += (num_segs * sh_len) + d_len;
- u64_stats_update_end(&stats->syncp);
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer(info);
-
- return NETDEV_TX_OK;
-}
-
-
-/*
- * Transmit a packet (called by the kernel via "hard_start_xmit" hook).
- */
-static int tile_net_tx(struct sk_buff *skb, struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- int my_cpu = smp_processor_id();
- struct tile_net_cpu *info = priv->cpu[my_cpu];
- struct tile_net_stats_t *stats = &info->stats;
-
- unsigned long irqflags;
-
- struct skb_shared_info *sh = skb_shinfo(skb);
-
- unsigned int len = skb->len;
- unsigned char *data = skb->data;
-
- unsigned int csum_start = skb_checksum_start_offset(skb);
-
- lepp_frag_t frags[1 + MAX_SKB_FRAGS];
-
- unsigned int num_frags;
-
- lepp_queue_t *eq = priv->eq;
-
- struct sk_buff *olds[8];
- unsigned int wanted = 8;
- unsigned int i, nolds = 0;
-
- unsigned int cmd_size = sizeof(lepp_cmd_t);
-
- unsigned int cmd_head, cmd_tail, cmd_next;
- unsigned int comp_tail;
-
- lepp_cmd_t cmds[1 + MAX_SKB_FRAGS];
-
-
- /*
- * This is paranoia, since we think that if the link doesn't come
- * up, telling Linux we have no carrier will keep it from trying
- * to transmit. If it does, though, we can't execute this routine,
- * since data structures we depend on aren't set up yet.
- */
- if (!info->registered)
- return NETDEV_TX_BUSY;
-
-
- /* Save the timestamp. */
- netif_trans_update(dev);
-
-
-#ifdef TILE_NET_PARANOIA
-#if CHIP_HAS_CBOX_HOME_MAP()
- if (hash_default) {
- HV_PTE pte = *virt_to_pte(current->mm, (unsigned long)data);
- if (hv_pte_get_mode(pte) != HV_PTE_MODE_CACHE_HASH_L3)
- panic("Non-HFH egress buffer! VA=%p Mode=%d PTE=%llx",
- data, hv_pte_get_mode(pte), hv_pte_val(pte));
- }
-#endif
-#endif
-
-
-#ifdef TILE_NET_DUMP_PACKETS
- /* ISSUE: Does not dump the "frags". */
- dump_packet(data, skb_headlen(skb), "tx");
-#endif /* TILE_NET_DUMP_PACKETS */
-
-
- if (sh->gso_size != 0)
- return tile_net_tx_tso(skb, dev);
-
-
- /* Prepare the commands. */
-
- num_frags = tile_net_tx_frags(frags, skb, data, skb_headlen(skb));
-
- for (i = 0; i < num_frags; i++) {
-
- bool final = (i == num_frags - 1);
-
- lepp_cmd_t cmd = {
- .cpa_lo = frags[i].cpa_lo,
- .cpa_hi = frags[i].cpa_hi,
- .length = frags[i].length,
- .hash_for_home = frags[i].hash_for_home,
- .send_completion = final,
- .end_of_packet = final
- };
-
- if (i == 0 && skb->ip_summed == CHECKSUM_PARTIAL) {
- cmd.compute_checksum = 1;
- cmd.checksum_data.bits.start_byte = csum_start;
- cmd.checksum_data.bits.count = len - csum_start;
- cmd.checksum_data.bits.destination_byte =
- csum_start + skb->csum_offset;
- }
-
- cmds[i] = cmd;
- }
-
-
- /* Prefetch and wait, to minimize time spent holding the spinlock. */
- prefetch_L1(&eq->comp_tail);
- prefetch_L1(&eq->cmd_tail);
- mb();
-
-
- /* Enqueue the commands. */
-
- spin_lock_irqsave(&priv->eq_lock, irqflags);
-
- /* Handle completions if needed to make room. */
- /* NOTE: Return NETDEV_TX_BUSY if there is still no room. */
- if (lepp_num_free_comp_slots(eq) == 0) {
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 0);
- if (nolds == 0) {
-busy:
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
- return NETDEV_TX_BUSY;
- }
- }
-
- cmd_head = eq->cmd_head;
- cmd_tail = eq->cmd_tail;
-
- /* Copy the commands, or fail. */
- /* NOTE: Return NETDEV_TX_BUSY if the queue is full. */
- for (i = 0; i < num_frags; i++) {
-
- /* Prepare to advance, detecting full queue. */
- cmd_next = cmd_tail + cmd_size;
- if (cmd_tail < cmd_head && cmd_next >= cmd_head)
- goto busy;
- if (cmd_next > LEPP_CMD_LIMIT) {
- cmd_next = 0;
- if (cmd_next == cmd_head)
- goto busy;
- }
-
- /* Copy the command. */
- *(lepp_cmd_t *)&eq->cmds[cmd_tail] = cmds[i];
-
- /* Advance. */
- cmd_tail = cmd_next;
- }
-
- /* Record "skb" for eventual freeing. */
- comp_tail = eq->comp_tail;
- eq->comps[comp_tail] = skb;
- LEPP_QINC(comp_tail);
- eq->comp_tail = comp_tail;
-
- /* Flush before allowing LEPP to handle the command. */
- /* ISSUE: Is this the optimal location for the flush? */
- __insn_mf();
-
- eq->cmd_tail = cmd_tail;
-
- /* NOTE: Using "4" here is more efficient than "0" or "2", */
- /* and, strangely, more efficient than pre-checking the number */
- /* of available completions, and comparing it to 4. */
- if (nolds == 0)
- nolds = tile_net_lepp_grab_comps(eq, olds, wanted, 4);
-
- spin_unlock_irqrestore(&priv->eq_lock, irqflags);
-
- /* Handle completions. */
- for (i = 0; i < nolds; i++)
- dev_consume_skb_any(olds[i]);
-
- /* HACK: Track "expanded" size for short packets (e.g. 42 < 60). */
- u64_stats_update_begin(&stats->syncp);
- stats->tx_packets++;
- stats->tx_bytes += ((len >= ETH_ZLEN) ? len : ETH_ZLEN);
- u64_stats_update_end(&stats->syncp);
-
- /* Make sure the egress timer is scheduled. */
- tile_net_schedule_egress_timer(info);
-
- return NETDEV_TX_OK;
-}
-
-
-/*
- * Deal with a transmit timeout.
- */
-static void tile_net_tx_timeout(struct net_device *dev)
-{
- PDEBUG("tile_net_tx_timeout()\n");
- PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
- jiffies - dev_trans_start(dev));
-
- /* XXX: ISSUE: This doesn't seem useful for us. */
- netif_wake_queue(dev);
-}
-
-
-/*
- * Ioctl commands.
- */
-static int tile_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- return -EOPNOTSUPP;
-}
-
-
-/*
- * Get System Network Statistics.
- *
- * Returns the address of the device statistics structure.
- */
-static void tile_net_get_stats64(struct net_device *dev,
- struct rtnl_link_stats64 *stats)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- u64 rx_packets = 0, tx_packets = 0;
- u64 rx_bytes = 0, tx_bytes = 0;
- u64 rx_errors = 0, rx_dropped = 0;
- int i;
-
- for_each_online_cpu(i) {
- struct tile_net_stats_t *cpu_stats;
- u64 trx_packets, ttx_packets, trx_bytes, ttx_bytes;
- u64 trx_errors, trx_dropped;
- unsigned int start;
-
- if (priv->cpu[i] == NULL)
- continue;
- cpu_stats = &priv->cpu[i]->stats;
-
- do {
- start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
- trx_packets = cpu_stats->rx_packets;
- ttx_packets = cpu_stats->tx_packets;
- trx_bytes = cpu_stats->rx_bytes;
- ttx_bytes = cpu_stats->tx_bytes;
- trx_errors = cpu_stats->rx_errors;
- trx_dropped = cpu_stats->rx_dropped;
- } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
-
- rx_packets += trx_packets;
- tx_packets += ttx_packets;
- rx_bytes += trx_bytes;
- tx_bytes += ttx_bytes;
- rx_errors += trx_errors;
- rx_dropped += trx_dropped;
- }
-
- stats->rx_packets = rx_packets;
- stats->tx_packets = tx_packets;
- stats->rx_bytes = rx_bytes;
- stats->tx_bytes = tx_bytes;
- stats->rx_errors = rx_errors;
- stats->rx_dropped = rx_dropped;
-}
-
-/*
- * Change the Ethernet Address of the NIC.
- *
- * The hypervisor driver does not support changing MAC address. However,
- * the IPP does not do anything with the MAC address, so the address which
- * gets used on outgoing packets, and which is accepted on incoming packets,
- * is completely up to the NetIO program or kernel driver which is actually
- * handling them.
- *
- * Returns 0 on success, negative on failure.
- */
-static int tile_net_set_mac_address(struct net_device *dev, void *p)
-{
- struct sockaddr *addr = p;
-
- if (!is_valid_ether_addr(addr->sa_data))
- return -EADDRNOTAVAIL;
-
- /* ISSUE: Note that "dev_addr" is now a pointer. */
- memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
-
- return 0;
-}
-
-
-/*
- * Obtain the MAC address from the hypervisor.
- * This must be done before opening the device.
- */
-static int tile_net_get_mac(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
-
- char hv_dev_name[32];
- int len;
-
- __netio_getset_offset_t offset = { .word = NETIO_IPP_PARAM_OFF };
-
- int ret;
-
- /* For example, "xgbe0". */
- strcpy(hv_dev_name, dev->name);
- len = strlen(hv_dev_name);
-
- /* For example, "xgbe/0". */
- hv_dev_name[len] = hv_dev_name[len - 1];
- hv_dev_name[len - 1] = '/';
- len++;
-
- /* For example, "xgbe/0/native_hash". */
- strcpy(hv_dev_name + len, hash_default ? "/native_hash" : "/native");
-
- /* Get the hypervisor handle for this device. */
- priv->hv_devhdl = hv_dev_open((HV_VirtAddr)hv_dev_name, 0);
- PDEBUG("hv_dev_open(%s) returned %d %p\n",
- hv_dev_name, priv->hv_devhdl, &priv->hv_devhdl);
- if (priv->hv_devhdl < 0) {
- if (priv->hv_devhdl == HV_ENODEV)
- printk(KERN_DEBUG "Ignoring unconfigured device %s\n",
- hv_dev_name);
- else
- printk(KERN_DEBUG "hv_dev_open(%s) returned %d\n",
- hv_dev_name, priv->hv_devhdl);
- return -1;
- }
-
- /*
- * Read the hardware address from the hypervisor.
- * ISSUE: Note that "dev_addr" is now a pointer.
- */
- offset.bits.class = NETIO_PARAM;
- offset.bits.addr = NETIO_PARAM_MAC;
- ret = hv_dev_pread(priv->hv_devhdl, 0,
- (HV_VirtAddr)dev->dev_addr, dev->addr_len,
- offset.word);
- PDEBUG("hv_dev_pread(NETIO_PARAM_MAC) returned %d\n", ret);
- if (ret <= 0) {
- printk(KERN_DEBUG "hv_dev_pread(NETIO_PARAM_MAC) %s failed\n",
- dev->name);
- /*
- * Since the device is configured by the hypervisor but we
- * can't get its MAC address, we are most likely running
- * the simulator, so let's generate a random MAC address.
- */
- eth_hw_addr_random(dev);
- }
-
- return 0;
-}
-
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-/*
- * Polling 'interrupt' - used by things like netconsole to send skbs
- * without having to re-enable interrupts. It's not called while
- * the interrupt routine is executing.
- */
-static void tile_net_netpoll(struct net_device *dev)
-{
- struct tile_net_priv *priv = netdev_priv(dev);
- disable_percpu_irq(priv->intr_id);
- tile_net_handle_ingress_interrupt(priv->intr_id, dev);
- enable_percpu_irq(priv->intr_id, 0);
-}
-#endif
-
-
-static const struct net_device_ops tile_net_ops = {
- .ndo_open = tile_net_open,
- .ndo_stop = tile_net_stop,
- .ndo_start_xmit = tile_net_tx,
- .ndo_do_ioctl = tile_net_ioctl,
- .ndo_get_stats64 = tile_net_get_stats64,
- .ndo_tx_timeout = tile_net_tx_timeout,
- .ndo_set_mac_address = tile_net_set_mac_address,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = tile_net_netpoll,
-#endif
-};
-
-
-/*
- * The setup function.
- *
- * This uses ether_setup() to assign various fields in dev, including
- * setting IFF_BROADCAST and IFF_MULTICAST, then sets some extra fields.
- */
-static void tile_net_setup(struct net_device *dev)
-{
- netdev_features_t features = 0;
-
- ether_setup(dev);
- dev->netdev_ops = &tile_net_ops;
- dev->watchdog_timeo = TILE_NET_TIMEOUT;
- dev->tx_queue_len = TILE_NET_TX_QUEUE_LEN;
-
- /* MTU range: 68 - 1500 */
- dev->mtu = TILE_NET_MTU;
- dev->min_mtu = ETH_MIN_MTU;
- dev->max_mtu = TILE_NET_MTU;
-
- features |= NETIF_F_HW_CSUM;
- features |= NETIF_F_SG;
-
- /* We support TSO iff the HV supports sufficient frags. */
- if (LEPP_MAX_FRAGS >= 1 + MAX_SKB_FRAGS)
- features |= NETIF_F_TSO;
-
- /* We can't support HIGHDMA without hash_default, since we need
- * to be able to finv() with a VA if we don't have hash_default.
- */
- if (hash_default)
- features |= NETIF_F_HIGHDMA;
-
- dev->hw_features |= features;
- dev->vlan_features |= features;
- dev->features |= features;
-}
-
-
-/*
- * Allocate the device structure, register the device, and obtain the
- * MAC address from the hypervisor.
- */
-static struct net_device *tile_net_dev_init(const char *name)
-{
- int ret;
- struct net_device *dev;
- struct tile_net_priv *priv;
-
- /*
- * Allocate the device structure. This allocates "priv", calls
- * tile_net_setup(), and saves "name". Normally, "name" is a
- * template, instantiated by register_netdev(), but not for us.
- */
- dev = alloc_netdev(sizeof(*priv), name, NET_NAME_UNKNOWN,
- tile_net_setup);
- if (!dev) {
- pr_err("alloc_netdev(%s) failed\n", name);
- return NULL;
- }
-
- priv = netdev_priv(dev);
-
- /* Initialize "priv". */
-
- memset(priv, 0, sizeof(*priv));
-
- /* Save "dev" for "tile_net_open_retry()". */
- priv->dev = dev;
-
- INIT_DELAYED_WORK(&priv->retry_work, tile_net_open_retry);
-
- spin_lock_init(&priv->eq_lock);
-
- /* Allocate "eq". */
- priv->eq_pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, EQ_ORDER);
- if (!priv->eq_pages) {
- free_netdev(dev);
- return NULL;
- }
- priv->eq = page_address(priv->eq_pages);
-
- /* Register the network device. */
- ret = register_netdev(dev);
- if (ret) {
- pr_err("register_netdev %s failed %d\n", dev->name, ret);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- return NULL;
- }
-
- /* Get the MAC address. */
- ret = tile_net_get_mac(dev);
- if (ret < 0) {
- unregister_netdev(dev);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- return NULL;
- }
-
- return dev;
-}
-
-
-/*
- * Module cleanup.
- *
- * FIXME: If compiled as a module, this module cannot be "unloaded",
- * because the "ingress interrupt handler" is registered permanently.
- */
-static void tile_net_cleanup(void)
-{
- int i;
-
- for (i = 0; i < TILE_NET_DEVS; i++) {
- if (tile_net_devs[i]) {
- struct net_device *dev = tile_net_devs[i];
- struct tile_net_priv *priv = netdev_priv(dev);
- unregister_netdev(dev);
- finv_buffer_remote(priv->eq, EQ_SIZE, 0);
- __free_pages(priv->eq_pages, EQ_ORDER);
- free_netdev(dev);
- }
- }
-}
-
-
-/*
- * Module initialization.
- */
-static int tile_net_init_module(void)
-{
- pr_info("Tilera Network Driver\n");
-
- tile_net_devs[0] = tile_net_dev_init("xgbe0");
- tile_net_devs[1] = tile_net_dev_init("xgbe1");
- tile_net_devs[2] = tile_net_dev_init("gbe0");
- tile_net_devs[3] = tile_net_dev_init("gbe1");
-
- return 0;
-}
-
-
-module_init(tile_net_init_module);
-module_exit(tile_net_cleanup);
-
-
-#ifndef MODULE
-
-/*
- * The "network_cpus" boot argument specifies the cpus that are dedicated
- * to handle ingress packets.
- *
- * The parameter should be in the form "network_cpus=m-n[,x-y]", where
- * m, n, x, y are integer numbers that represent the cpus that can be
- * neither a dedicated cpu nor a dataplane cpu.
- */
-static int __init network_cpus_setup(char *str)
-{
- int rc = cpulist_parse_crop(str, &network_cpus_map);
- if (rc != 0) {
- pr_warn("network_cpus=%s: malformed cpu list\n", str);
- } else {
-
- /* Remove dedicated cpus. */
- cpumask_and(&network_cpus_map, &network_cpus_map,
- cpu_possible_mask);
-
-
- if (cpumask_empty(&network_cpus_map)) {
- pr_warn("Ignoring network_cpus='%s'\n", str);
- } else {
- pr_info("Linux network CPUs: %*pbl\n",
- cpumask_pr_args(&network_cpus_map));
- network_cpus_used = true;
- }
- }
-
- return 0;
-}
-__setup("network_cpus=", network_cpus_setup);
-
-#endif
projects / platform / kernel / linux-rpi.git / commitdiff