#include <linux/if_arp.h>
#include <linux/timer.h>
#include <linux/rtnetlink.h>
+#include <linux/pkt_sched.h>
#include <net/caif/caif_layer.h>
#include <net/caif/caif_hsi.h>
module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms.");
+static int aggregation_timeout = 1;
+module_param(aggregation_timeout, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(aggregation_timeout, "Aggregation timeout on HSI, ms.");
+
/*
* HSI padding options.
* Warning: must be a base of 2 (& operation used) and can not be zero !
queue_work(cfhsi->wq, &cfhsi->wake_down_work);
}
+static void cfhsi_update_aggregation_stats(struct cfhsi *cfhsi,
+ const struct sk_buff *skb,
+ int direction)
+{
+ struct caif_payload_info *info;
+ int hpad, tpad, len;
+
+ info = (struct caif_payload_info *)&skb->cb;
+ hpad = 1 + PAD_POW2((info->hdr_len + 1), hsi_head_align);
+ tpad = PAD_POW2((skb->len + hpad), hsi_tail_align);
+ len = skb->len + hpad + tpad;
+
+ if (direction > 0)
+ cfhsi->aggregation_len += len;
+ else if (direction < 0)
+ cfhsi->aggregation_len -= len;
+}
+
+static bool cfhsi_can_send_aggregate(struct cfhsi *cfhsi)
+{
+ int i;
+
+ if (cfhsi->aggregation_timeout < 0)
+ return true;
+
+ for (i = 0; i < CFHSI_PRIO_BEBK; ++i) {
+ if (cfhsi->qhead[i].qlen)
+ return true;
+ }
+
+ /* TODO: Use aggregation_len instead */
+ if (cfhsi->qhead[CFHSI_PRIO_BEBK].qlen >= CFHSI_MAX_PKTS)
+ return true;
+
+ return false;
+}
+
+static struct sk_buff *cfhsi_dequeue(struct cfhsi *cfhsi)
+{
+ struct sk_buff *skb;
+ int i;
+
+ for (i = 0; i < CFHSI_PRIO_LAST; ++i) {
+ skb = skb_dequeue(&cfhsi->qhead[i]);
+ if (skb)
+ break;
+ }
+
+ return skb;
+}
+
+static int cfhsi_tx_queue_len(struct cfhsi *cfhsi)
+{
+ int i, len = 0;
+ for (i = 0; i < CFHSI_PRIO_LAST; ++i)
+ len += skb_queue_len(&cfhsi->qhead[i]);
+ return len;
+}
+
static void cfhsi_abort_tx(struct cfhsi *cfhsi)
{
struct sk_buff *skb;
for (;;) {
spin_lock_bh(&cfhsi->lock);
- skb = skb_dequeue(&cfhsi->qhead);
+ skb = cfhsi_dequeue(cfhsi);
if (!skb)
break;
cfhsi->ndev->stats.tx_errors++;
cfhsi->ndev->stats.tx_dropped++;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
spin_unlock_bh(&cfhsi->lock);
kfree_skb(skb);
}
cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
- mod_timer(&cfhsi->timer,
+ mod_timer(&cfhsi->inactivity_timer,
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
}
struct sk_buff *skb;
u8 *pfrm = desc->emb_frm + CFHSI_MAX_EMB_FRM_SZ;
- skb = skb_dequeue(&cfhsi->qhead);
+ skb = cfhsi_dequeue(cfhsi);
if (!skb)
return 0;
pemb += hpad;
/* Update network statistics. */
+ spin_lock_bh(&cfhsi->lock);
cfhsi->ndev->stats.tx_packets++;
cfhsi->ndev->stats.tx_bytes += skb->len;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
+ spin_unlock_bh(&cfhsi->lock);
/* Copy in embedded CAIF frame. */
skb_copy_bits(skb, 0, pemb, skb->len);
+
+ /* Consume the SKB */
consume_skb(skb);
skb = NULL;
}
int tpad = 0;
if (!skb)
- skb = skb_dequeue(&cfhsi->qhead);
+ skb = cfhsi_dequeue(cfhsi);
if (!skb)
break;
pfrm += hpad;
/* Update network statistics. */
+ spin_lock_bh(&cfhsi->lock);
cfhsi->ndev->stats.tx_packets++;
cfhsi->ndev->stats.tx_bytes += skb->len;
+ cfhsi_update_aggregation_stats(cfhsi, skb, -1);
+ spin_unlock_bh(&cfhsi->lock);
/* Copy in CAIF frame. */
skb_copy_bits(skb, 0, pfrm, skb->len);
/* Update frame pointer. */
pfrm += skb->len + tpad;
+
+ /* Consume the SKB */
consume_skb(skb);
skb = NULL;
}
/* Check if we can piggy-back another descriptor. */
- skb = skb_peek(&cfhsi->qhead);
- if (skb)
+ if (cfhsi_can_send_aggregate(cfhsi))
desc->header |= CFHSI_PIGGY_DESC;
else
desc->header &= ~CFHSI_PIGGY_DESC;
return CFHSI_DESC_SZ + pld_len;
}
-static void cfhsi_tx_done(struct cfhsi *cfhsi)
+static void cfhsi_start_tx(struct cfhsi *cfhsi)
{
- struct cfhsi_desc *desc = NULL;
- int len = 0;
- int res;
+ struct cfhsi_desc *desc = (struct cfhsi_desc *)cfhsi->tx_buf;
+ int len, res;
dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
return;
- desc = (struct cfhsi_desc *)cfhsi->tx_buf;
-
do {
- /*
- * Send flow on if flow off has been previously signalled
- * and number of packets is below low water mark.
- */
- spin_lock_bh(&cfhsi->lock);
- if (cfhsi->flow_off_sent &&
- cfhsi->qhead.qlen <= cfhsi->q_low_mark &&
- cfhsi->cfdev.flowctrl) {
-
- cfhsi->flow_off_sent = 0;
- cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
- }
- spin_unlock_bh(&cfhsi->lock);
-
/* Create HSI frame. */
- do {
- len = cfhsi_tx_frm(desc, cfhsi);
- if (!len) {
- spin_lock_bh(&cfhsi->lock);
- if (unlikely(skb_peek(&cfhsi->qhead))) {
- spin_unlock_bh(&cfhsi->lock);
- continue;
- }
- cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
- /* Start inactivity timer. */
- mod_timer(&cfhsi->timer,
- jiffies + cfhsi->inactivity_timeout);
+ len = cfhsi_tx_frm(desc, cfhsi);
+ if (!len) {
+ spin_lock_bh(&cfhsi->lock);
+ if (unlikely(cfhsi_tx_queue_len(cfhsi))) {
spin_unlock_bh(&cfhsi->lock);
- goto done;
+ res = -EAGAIN;
+ continue;
}
- } while (!len);
+ cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
+ /* Start inactivity timer. */
+ mod_timer(&cfhsi->inactivity_timer,
+ jiffies + cfhsi->inactivity_timeout);
+ spin_unlock_bh(&cfhsi->lock);
+ break;
+ }
/* Set up new transfer. */
res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev);
- if (WARN_ON(res < 0)) {
+ if (WARN_ON(res < 0))
dev_err(&cfhsi->ndev->dev, "%s: TX error %d.\n",
__func__, res);
- }
} while (res < 0);
+}
+
+static void cfhsi_tx_done(struct cfhsi *cfhsi)
+{
+ dev_dbg(&cfhsi->ndev->dev, "%s.\n", __func__);
+
+ if (test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
+ return;
+
+ /*
+ * Send flow on if flow off has been previously signalled
+ * and number of packets is below low water mark.
+ */
+ spin_lock_bh(&cfhsi->lock);
+ if (cfhsi->flow_off_sent &&
+ cfhsi_tx_queue_len(cfhsi) <= cfhsi->q_low_mark &&
+ cfhsi->cfdev.flowctrl) {
+
+ cfhsi->flow_off_sent = 0;
+ cfhsi->cfdev.flowctrl(cfhsi->ndev, ON);
+ }
+
+ if (cfhsi_can_send_aggregate(cfhsi)) {
+ spin_unlock_bh(&cfhsi->lock);
+ cfhsi_start_tx(cfhsi);
+ } else {
+ mod_timer(&cfhsi->aggregation_timer,
+ jiffies + cfhsi->aggregation_timeout);
+ spin_unlock_bh(&cfhsi->lock);
+ }
-done:
return;
}
/* Update inactivity timer if pending. */
spin_lock_bh(&cfhsi->lock);
- mod_timer_pending(&cfhsi->timer,
+ mod_timer_pending(&cfhsi->inactivity_timer,
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
spin_lock_bh(&cfhsi->lock);
- /* Resume transmit if queue is not empty. */
- if (!skb_peek(&cfhsi->qhead)) {
+ /* Resume transmit if queues are not empty. */
+ if (!cfhsi_tx_queue_len(cfhsi)) {
dev_dbg(&cfhsi->ndev->dev, "%s: Peer wake, start timer.\n",
__func__);
/* Start inactivity timer. */
- mod_timer(&cfhsi->timer,
+ mod_timer(&cfhsi->inactivity_timer,
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
return;
wake_up_interruptible(&cfhsi->wake_down_wait);
}
+static void cfhsi_aggregation_tout(unsigned long arg)
+{
+ struct cfhsi *cfhsi = (struct cfhsi *)arg;
+
+ dev_dbg(&cfhsi->ndev->dev, "%s.\n",
+ __func__);
+
+ cfhsi_start_tx(cfhsi);
+}
+
static int cfhsi_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cfhsi *cfhsi = NULL;
int start_xfer = 0;
int timer_active;
+ int prio;
if (!dev)
return -EINVAL;
cfhsi = netdev_priv(dev);
+ switch (skb->priority) {
+ case TC_PRIO_BESTEFFORT:
+ case TC_PRIO_FILLER:
+ case TC_PRIO_BULK:
+ prio = CFHSI_PRIO_BEBK;
+ break;
+ case TC_PRIO_INTERACTIVE_BULK:
+ prio = CFHSI_PRIO_VI;
+ break;
+ case TC_PRIO_INTERACTIVE:
+ prio = CFHSI_PRIO_VO;
+ break;
+ case TC_PRIO_CONTROL:
+ default:
+ prio = CFHSI_PRIO_CTL;
+ break;
+ }
+
spin_lock_bh(&cfhsi->lock);
- skb_queue_tail(&cfhsi->qhead, skb);
+ /* Update aggregation statistics */
+ cfhsi_update_aggregation_stats(cfhsi, skb, 1);
+
+ /* Queue the SKB */
+ skb_queue_tail(&cfhsi->qhead[prio], skb);
/* Sanity check; xmit should not be called after unregister_netdev */
if (WARN_ON(test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))) {
/* Send flow off if number of packets is above high water mark. */
if (!cfhsi->flow_off_sent &&
- cfhsi->qhead.qlen > cfhsi->q_high_mark &&
+ cfhsi_tx_queue_len(cfhsi) > cfhsi->q_high_mark &&
cfhsi->cfdev.flowctrl) {
cfhsi->flow_off_sent = 1;
cfhsi->cfdev.flowctrl(cfhsi->ndev, OFF);
}
if (!start_xfer) {
+ /* Send aggregate if it is possible */
+ bool aggregate_ready =
+ cfhsi_can_send_aggregate(cfhsi) &&
+ del_timer(&cfhsi->aggregation_timer) > 0;
spin_unlock_bh(&cfhsi->lock);
+ if (aggregate_ready)
+ cfhsi_start_tx(cfhsi);
return 0;
}
/* Delete inactivity timer if started. */
- timer_active = del_timer_sync(&cfhsi->timer);
+ timer_active = del_timer_sync(&cfhsi->inactivity_timer);
spin_unlock_bh(&cfhsi->lock);
static void cfhsi_setup(struct net_device *dev)
{
+ int i;
struct cfhsi *cfhsi = netdev_priv(dev);
dev->features = 0;
dev->netdev_ops = &cfhsi_ops;
dev->mtu = CFHSI_MAX_CAIF_FRAME_SZ;
dev->tx_queue_len = 0;
dev->destructor = free_netdev;
- skb_queue_head_init(&cfhsi->qhead);
+ for (i = 0; i < CFHSI_PRIO_LAST; ++i)
+ skb_queue_head_init(&cfhsi->qhead[i]);
cfhsi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
cfhsi->cfdev.use_frag = false;
cfhsi->cfdev.use_stx = false;
cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
}
+ /* Initialize aggregation timeout */
+ cfhsi->aggregation_timeout = aggregation_timeout;
+
/* Initialize recieve vaiables. */
cfhsi->rx_ptr = cfhsi->rx_buf;
cfhsi->rx_len = CFHSI_DESC_SZ;
init_waitqueue_head(&cfhsi->flush_fifo_wait);
/* Setup the inactivity timer. */
- init_timer(&cfhsi->timer);
- cfhsi->timer.data = (unsigned long)cfhsi;
- cfhsi->timer.function = cfhsi_inactivity_tout;
+ init_timer(&cfhsi->inactivity_timer);
+ cfhsi->inactivity_timer.data = (unsigned long)cfhsi;
+ cfhsi->inactivity_timer.function = cfhsi_inactivity_tout;
/* Setup the slowpath RX timer. */
init_timer(&cfhsi->rx_slowpath_timer);
cfhsi->rx_slowpath_timer.data = (unsigned long)cfhsi;
cfhsi->rx_slowpath_timer.function = cfhsi_rx_slowpath;
+ /* Setup the aggregation timer. */
+ init_timer(&cfhsi->aggregation_timer);
+ cfhsi->aggregation_timer.data = (unsigned long)cfhsi;
+ cfhsi->aggregation_timer.function = cfhsi_aggregation_tout;
/* Add CAIF HSI device to list. */
spin_lock(&cfhsi_list_lock);
flush_workqueue(cfhsi->wq);
/* Delete timers if pending */
- del_timer_sync(&cfhsi->timer);
+ del_timer_sync(&cfhsi->inactivity_timer);
del_timer_sync(&cfhsi->rx_slowpath_timer);
+ del_timer_sync(&cfhsi->aggregation_timer);
/* Cancel pending RX request (if any) */
cfhsi->dev->cfhsi_rx_cancel(cfhsi->dev);
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