config NET_DSA_SJA1105
tristate "NXP SJA1105 Ethernet switch family support"
depends on NET_DSA && SPI
+ select NET_DSA_TAG_SJA1105
select PACKING
select CRC32
help
#include <linux/dsa/sja1105.h>
#include <net/dsa.h>
+#include <linux/mutex.h>
#include "sja1105_static_config.h"
#define SJA1105_NUM_PORTS 5
struct gpio_desc *reset_gpio;
struct spi_device *spidev;
struct dsa_switch *ds;
+ struct sja1105_port ports[SJA1105_NUM_PORTS];
+ /* Serializes transmission of management frames so that
+ * the switch doesn't confuse them with one another.
+ */
+ struct mutex mgmt_lock;
};
#include "sja1105_dynamic_config.h"
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/if_ether.h>
+#include <linux/dsa/8021q.h>
#include "sja1105.h"
static void sja1105_hw_reset(struct gpio_desc *gpio, unsigned int pulse_len,
.tpid2 = ETH_P_SJA1105,
};
struct sja1105_table *table;
- int i;
+ int i, k = 0;
- for (i = 0; i < SJA1105_NUM_PORTS; i++)
+ for (i = 0; i < SJA1105_NUM_PORTS; i++) {
if (dsa_is_dsa_port(priv->ds, i))
default_general_params.casc_port = i;
+ else if (dsa_is_user_port(priv->ds, i))
+ priv->ports[i].mgmt_slot = k++;
+ }
table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS];
return 0;
}
+static int sja1105_setup_8021q_tagging(struct dsa_switch *ds, bool enabled)
+{
+ int rc, i;
+
+ for (i = 0; i < SJA1105_NUM_PORTS; i++) {
+ rc = dsa_port_setup_8021q_tagging(ds, i, enabled);
+ if (rc < 0) {
+ dev_err(ds->dev, "Failed to setup VLAN tagging for port %d: %d\n",
+ i, rc);
+ return rc;
+ }
+ }
+ dev_info(ds->dev, "%s switch tagging\n",
+ enabled ? "Enabled" : "Disabled");
+ return 0;
+}
+
static enum dsa_tag_protocol
sja1105_get_tag_protocol(struct dsa_switch *ds, int port)
{
- return DSA_TAG_PROTO_NONE;
+ return DSA_TAG_PROTO_SJA1105;
}
/* This callback needs to be present */
if (rc)
dev_err(ds->dev, "Failed to change VLAN Ethertype\n");
- return rc;
+ /* Switch port identification based on 802.1Q is only passable
+ * if we are not under a vlan_filtering bridge. So make sure
+ * the two configurations are mutually exclusive.
+ */
+ return sja1105_setup_8021q_tagging(ds, !enabled);
}
static void sja1105_vlan_add(struct dsa_switch *ds, int port,
*/
ds->vlan_filtering_is_global = true;
- return 0;
+ /* The DSA/switchdev model brings up switch ports in standalone mode by
+ * default, and that means vlan_filtering is 0 since they're not under
+ * a bridge, so it's safe to set up switch tagging at this time.
+ */
+ return sja1105_setup_8021q_tagging(ds, true);
+}
+
+static int sja1105_mgmt_xmit(struct dsa_switch *ds, int port, int slot,
+ struct sk_buff *skb)
+{
+ struct sja1105_mgmt_entry mgmt_route = {0};
+ struct sja1105_private *priv = ds->priv;
+ struct ethhdr *hdr;
+ int timeout = 10;
+ int rc;
+
+ hdr = eth_hdr(skb);
+
+ mgmt_route.macaddr = ether_addr_to_u64(hdr->h_dest);
+ mgmt_route.destports = BIT(port);
+ mgmt_route.enfport = 1;
+
+ rc = sja1105_dynamic_config_write(priv, BLK_IDX_MGMT_ROUTE,
+ slot, &mgmt_route, true);
+ if (rc < 0) {
+ kfree_skb(skb);
+ return rc;
+ }
+
+ /* Transfer skb to the host port. */
+ dsa_enqueue_skb(skb, ds->ports[port].slave);
+
+ /* Wait until the switch has processed the frame */
+ do {
+ rc = sja1105_dynamic_config_read(priv, BLK_IDX_MGMT_ROUTE,
+ slot, &mgmt_route);
+ if (rc < 0) {
+ dev_err_ratelimited(priv->ds->dev,
+ "failed to poll for mgmt route\n");
+ continue;
+ }
+
+ /* UM10944: The ENFPORT flag of the respective entry is
+ * cleared when a match is found. The host can use this
+ * flag as an acknowledgment.
+ */
+ cpu_relax();
+ } while (mgmt_route.enfport && --timeout);
+
+ if (!timeout) {
+ /* Clean up the management route so that a follow-up
+ * frame may not match on it by mistake.
+ */
+ sja1105_dynamic_config_write(priv, BLK_IDX_MGMT_ROUTE,
+ slot, &mgmt_route, false);
+ dev_err_ratelimited(priv->ds->dev, "xmit timed out\n");
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/* Deferred work is unfortunately necessary because setting up the management
+ * route cannot be done from atomit context (SPI transfer takes a sleepable
+ * lock on the bus)
+ */
+static netdev_tx_t sja1105_port_deferred_xmit(struct dsa_switch *ds, int port,
+ struct sk_buff *skb)
+{
+ struct sja1105_private *priv = ds->priv;
+ struct sja1105_port *sp = &priv->ports[port];
+ int slot = sp->mgmt_slot;
+
+ /* The tragic fact about the switch having 4x2 slots for installing
+ * management routes is that all of them except one are actually
+ * useless.
+ * If 2 slots are simultaneously configured for two BPDUs sent to the
+ * same (multicast) DMAC but on different egress ports, the switch
+ * would confuse them and redirect first frame it receives on the CPU
+ * port towards the port configured on the numerically first slot
+ * (therefore wrong port), then second received frame on second slot
+ * (also wrong port).
+ * So for all practical purposes, there needs to be a lock that
+ * prevents that from happening. The slot used here is utterly useless
+ * (could have simply been 0 just as fine), but we are doing it
+ * nonetheless, in case a smarter idea ever comes up in the future.
+ */
+ mutex_lock(&priv->mgmt_lock);
+
+ sja1105_mgmt_xmit(ds, port, slot, skb);
+
+ mutex_unlock(&priv->mgmt_lock);
+ return NETDEV_TX_OK;
}
/* The MAXAGE setting belongs to the L2 Forwarding Parameters table,
.port_mdb_prepare = sja1105_mdb_prepare,
.port_mdb_add = sja1105_mdb_add,
.port_mdb_del = sja1105_mdb_del,
+ .port_deferred_xmit = sja1105_port_deferred_xmit,
};
static int sja1105_check_device_id(struct sja1105_private *priv)
struct device *dev = &spi->dev;
struct sja1105_private *priv;
struct dsa_switch *ds;
- int rc;
+ int rc, i;
if (!dev->of_node) {
dev_err(dev, "No DTS bindings for SJA1105 driver\n");
ds->priv = priv;
priv->ds = ds;
+ /* Connections between dsa_port and sja1105_port */
+ for (i = 0; i < SJA1105_NUM_PORTS; i++) {
+ struct sja1105_port *sp = &priv->ports[i];
+
+ ds->ports[i].priv = sp;
+ sp->dp = &ds->ports[i];
+ }
+ mutex_init(&priv->mgmt_lock);
+
return dsa_register_switch(priv->ds);
}
* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
*/
-/* Included by drivers/net/dsa/sja1105/sja1105.h */
+/* Included by drivers/net/dsa/sja1105/sja1105.h and net/dsa/tag_sja1105.c */
#ifndef _NET_DSA_SJA1105_H
#define _NET_DSA_SJA1105_H
+#include <linux/skbuff.h>
#include <linux/etherdevice.h>
+#include <net/dsa.h>
#define ETH_P_SJA1105 ETH_P_DSA_8021Q
-/* The switch can only be convinced to stay in unmanaged mode and not trap any
- * link-local traffic by actually telling it to filter frames sent at the
- * 00:00:00:00:00:00 destination MAC.
- */
-#define SJA1105_LINKLOCAL_FILTER_A 0x000000000000ull
-#define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFFFFFFFFull
-#define SJA1105_LINKLOCAL_FILTER_B 0x000000000000ull
-#define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFFFFFFFFull
+/* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */
+#define SJA1105_LINKLOCAL_FILTER_A 0x0180C2000000ull
+#define SJA1105_LINKLOCAL_FILTER_A_MASK 0xFFFFFF000000ull
+/* IEEE 1588 Annex F: Transport of PTP over Ethernet (01:1B:19:xx:xx:xx) */
+#define SJA1105_LINKLOCAL_FILTER_B 0x011B19000000ull
+#define SJA1105_LINKLOCAL_FILTER_B_MASK 0xFFFFFF000000ull
+
+enum sja1105_frame_type {
+ SJA1105_FRAME_TYPE_NORMAL = 0,
+ SJA1105_FRAME_TYPE_LINK_LOCAL,
+};
+
+struct sja1105_skb_cb {
+ enum sja1105_frame_type type;
+};
+
+#define SJA1105_SKB_CB(skb) \
+ ((struct sja1105_skb_cb *)DSA_SKB_CB_PRIV(skb))
+
+struct sja1105_port {
+ struct dsa_port *dp;
+ int mgmt_slot;
+};
#endif /* _NET_DSA_SJA1105_H */
#define DSA_TAG_PROTO_QCA_VALUE 10
#define DSA_TAG_PROTO_TRAILER_VALUE 11
#define DSA_TAG_PROTO_8021Q_VALUE 12
+#define DSA_TAG_PROTO_SJA1105_VALUE 13
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
DSA_TAG_PROTO_QCA = DSA_TAG_PROTO_QCA_VALUE,
DSA_TAG_PROTO_TRAILER = DSA_TAG_PROTO_TRAILER_VALUE,
DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE,
+ DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE,
};
struct packet_type;
Say Y or M if you want to enable support for tagging frames for the
SMSC/Microchip LAN9303 family of switches.
+config NET_DSA_TAG_SJA1105
+ tristate "Tag driver for NXP SJA1105 switches"
+ select NET_DSA_TAG_8021Q
+ help
+ Say Y or M if you want to enable support for tagging frames with the
+ NXP SJA1105 switch family. Both the native tagging protocol (which
+ is only for link-local traffic) as well as non-native tagging (based
+ on a custom 802.1Q VLAN header) are available.
+
config NET_DSA_TAG_TRAILER
tristate "Tag driver for switches using a trailer tag"
help
obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o
obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o
obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o
+obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o
obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
+ */
+#include <linux/if_vlan.h>
+#include <linux/dsa/sja1105.h>
+#include <linux/dsa/8021q.h>
+#include <linux/packing.h>
+#include "dsa_priv.h"
+
+/* Similar to is_link_local_ether_addr(hdr->h_dest) but also covers PTP */
+static inline bool sja1105_is_link_local(const struct sk_buff *skb)
+{
+ const struct ethhdr *hdr = eth_hdr(skb);
+ u64 dmac = ether_addr_to_u64(hdr->h_dest);
+
+ if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==
+ SJA1105_LINKLOCAL_FILTER_A)
+ return true;
+ if ((dmac & SJA1105_LINKLOCAL_FILTER_B_MASK) ==
+ SJA1105_LINKLOCAL_FILTER_B)
+ return true;
+ return false;
+}
+
+/* This is the first time the tagger sees the frame on RX.
+ * Figure out if we can decode it, and if we can, annotate skb->cb with how we
+ * plan to do that, so we don't need to check again in the rcv function.
+ */
+static bool sja1105_filter(const struct sk_buff *skb, struct net_device *dev)
+{
+ if (sja1105_is_link_local(skb)) {
+ SJA1105_SKB_CB(skb)->type = SJA1105_FRAME_TYPE_LINK_LOCAL;
+ return true;
+ }
+ if (!dsa_port_is_vlan_filtering(dev->dsa_ptr)) {
+ SJA1105_SKB_CB(skb)->type = SJA1105_FRAME_TYPE_NORMAL;
+ return true;
+ }
+ return false;
+}
+
+static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ struct dsa_port *dp = dsa_slave_to_port(netdev);
+ struct dsa_switch *ds = dp->ds;
+ u16 tx_vid = dsa_8021q_tx_vid(ds, dp->index);
+ u8 pcp = skb->priority;
+
+ /* Transmitting management traffic does not rely upon switch tagging,
+ * but instead SPI-installed management routes. Part 2 of this
+ * is the .port_deferred_xmit driver callback.
+ */
+ if (unlikely(sja1105_is_link_local(skb)))
+ return dsa_defer_xmit(skb, netdev);
+
+ /* If we are under a vlan_filtering bridge, IP termination on
+ * switch ports based on 802.1Q tags is simply too brittle to
+ * be passable. So just defer to the dsa_slave_notag_xmit
+ * implementation.
+ */
+ if (dsa_port_is_vlan_filtering(dp))
+ return skb;
+
+ return dsa_8021q_xmit(skb, netdev, ETH_P_SJA1105,
+ ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
+}
+
+static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
+ struct net_device *netdev,
+ struct packet_type *pt)
+{
+ struct ethhdr *hdr = eth_hdr(skb);
+ u64 source_port, switch_id;
+ struct sk_buff *nskb;
+ u16 tpid, vid, tci;
+ bool is_tagged;
+
+ nskb = dsa_8021q_rcv(skb, netdev, pt, &tpid, &tci);
+ is_tagged = (nskb && tpid == ETH_P_SJA1105);
+
+ skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
+ vid = tci & VLAN_VID_MASK;
+
+ skb->offload_fwd_mark = 1;
+
+ if (SJA1105_SKB_CB(skb)->type == SJA1105_FRAME_TYPE_LINK_LOCAL) {
+ /* Management traffic path. Switch embeds the switch ID and
+ * port ID into bytes of the destination MAC, courtesy of
+ * the incl_srcpt options.
+ */
+ source_port = hdr->h_dest[3];
+ switch_id = hdr->h_dest[4];
+ /* Clear the DMAC bytes that were mangled by the switch */
+ hdr->h_dest[3] = 0;
+ hdr->h_dest[4] = 0;
+ } else {
+ /* Normal traffic path. */
+ source_port = dsa_8021q_rx_source_port(vid);
+ switch_id = dsa_8021q_rx_switch_id(vid);
+ }
+
+ skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
+ if (!skb->dev) {
+ netdev_warn(netdev, "Couldn't decode source port\n");
+ return NULL;
+ }
+
+ /* Delete/overwrite fake VLAN header, DSA expects to not find
+ * it there, see dsa_switch_rcv: skb_push(skb, ETH_HLEN).
+ */
+ if (is_tagged)
+ memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - VLAN_HLEN,
+ ETH_HLEN - VLAN_HLEN);
+
+ return skb;
+}
+
+static struct dsa_device_ops sja1105_netdev_ops = {
+ .name = "sja1105",
+ .proto = DSA_TAG_PROTO_SJA1105,
+ .xmit = sja1105_xmit,
+ .rcv = sja1105_rcv,
+ .filter = sja1105_filter,
+ .overhead = VLAN_HLEN,
+};
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105);
+
+module_dsa_tag_driver(sja1105_netdev_ops);
projects / platform / kernel / linux-rpi.git / commitdiff