// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019, Vladimir Oltean <[email protected]>
*/
#include <linux/if_vlan.h>
#include <linux/dsa/sja1105.h>
#include <linux/dsa/8021q.h>
#include <linux/packing.h>
#include "tag.h"
#include "tag_8021q.h"
#define SJA1105_NAME "sja1105"
#define SJA1110_NAME "sja1110"
/* Is this a TX or an RX header? */
#define SJA1110_HEADER_HOST_TO_SWITCH BIT(15)
/* RX header */
#define SJA1110_RX_HEADER_IS_METADATA BIT(14)
#define SJA1110_RX_HEADER_HOST_ONLY BIT(13)
#define SJA1110_RX_HEADER_HAS_TRAILER BIT(12)
/* Trap-to-host format (no trailer present) */
#define SJA1110_RX_HEADER_SRC_PORT(x) (((x) & GENMASK(7, 4)) >> 4)
#define SJA1110_RX_HEADER_SWITCH_ID(x) ((x) & GENMASK(3, 0))
/* Timestamp format (trailer present) */
#define SJA1110_RX_HEADER_TRAILER_POS(x) ((x) & GENMASK(11, 0))
#define SJA1110_RX_TRAILER_SWITCH_ID(x) (((x) & GENMASK(7, 4)) >> 4)
#define SJA1110_RX_TRAILER_SRC_PORT(x) ((x) & GENMASK(3, 0))
/* Meta frame format (for 2-step TX timestamps) */
#define SJA1110_RX_HEADER_N_TS(x) (((x) & GENMASK(8, 4)) >> 4)
/* TX header */
#define SJA1110_TX_HEADER_UPDATE_TC BIT(14)
#define SJA1110_TX_HEADER_TAKE_TS BIT(13)
#define SJA1110_TX_HEADER_TAKE_TS_CASC BIT(12)
#define SJA1110_TX_HEADER_HAS_TRAILER BIT(11)
/* Only valid if SJA1110_TX_HEADER_HAS_TRAILER is false */
#define SJA1110_TX_HEADER_PRIO(x) (((x) << 7) & GENMASK(10, 7))
#define SJA1110_TX_HEADER_TSTAMP_ID(x) ((x) & GENMASK(7, 0))
/* Only valid if SJA1110_TX_HEADER_HAS_TRAILER is true */
#define SJA1110_TX_HEADER_TRAILER_POS(x) ((x) & GENMASK(10, 0))
#define SJA1110_TX_TRAILER_TSTAMP_ID(x) (((x) << 24) & GENMASK(31, 24))
#define SJA1110_TX_TRAILER_PRIO(x) (((x) << 21) & GENMASK(23, 21))
#define SJA1110_TX_TRAILER_SWITCHID(x) (((x) << 12) & GENMASK(15, 12))
#define SJA1110_TX_TRAILER_DESTPORTS(x) (((x) << 1) & GENMASK(11, 1))
#define SJA1110_META_TSTAMP_SIZE 10
#define SJA1110_HEADER_LEN 4
#define SJA1110_RX_TRAILER_LEN 13
#define SJA1110_TX_TRAILER_LEN 4
#define SJA1110_MAX_PADDING_LEN 15
struct sja1105_tagger_private {
struct sja1105_tagger_data data; /* Must be first */
/* Protects concurrent access to the meta state machine
* from taggers running on multiple ports on SMP systems
*/
spinlock_t meta_lock;
struct sk_buff *stampable_skb;
struct kthread_worker *xmit_worker;
};
static struct sja1105_tagger_private *
sja1105_tagger_private(struct dsa_switch *ds)
{
return ds->tagger_data;
}
/* Similar to is_link_local_ether_addr(hdr->h_dest) but also covers PTP */
static 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 (ntohs(hdr->h_proto) == ETH_P_SJA1105_META)
return false;
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;
}
struct sja1105_meta {
u64 tstamp;
u64 dmac_byte_4;
u64 dmac_byte_3;
u64 source_port;
u64 switch_id;
};
static void sja1105_meta_unpack(const struct sk_buff *skb,
struct sja1105_meta *meta)
{
u8 *buf = skb_mac_header(skb) + ETH_HLEN;
/* UM10944.pdf section 4.2.17 AVB Parameters:
* Structure of the meta-data follow-up frame.
* It is in network byte order, so there are no quirks
* while unpacking the meta frame.
*
* Also SJA1105 E/T only populates bits 23:0 of the timestamp
* whereas P/Q/R/S does 32 bits. Since the structure is the
* same and the E/T puts zeroes in the high-order byte, use
* a unified unpacking command for both device series.
*/
packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0);
packing(buf + 4, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
packing(buf + 5, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0);
packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0);
}
static bool sja1105_is_meta_frame(const struct sk_buff *skb)
{
const struct ethhdr *hdr = eth_hdr(skb);
u64 smac = ether_addr_to_u64(hdr->h_source);
u64 dmac = ether_addr_to_u64(hdr->h_dest);
if (smac != SJA1105_META_SMAC)
return false;
if (dmac != SJA1105_META_DMAC)
return false;
if (ntohs(hdr->h_proto) != ETH_P_SJA1105_META)
return false;
return true;
}
/* Calls sja1105_port_deferred_xmit in sja1105_main.c */
static struct sk_buff *sja1105_defer_xmit(struct dsa_port *dp,
struct sk_buff *skb)
{
struct sja1105_tagger_data *tagger_data = sja1105_tagger_data(dp->ds);
struct sja1105_tagger_private *priv = sja1105_tagger_private(dp->ds);
void (*xmit_work_fn)(struct kthread_work *work);
struct sja1105_deferred_xmit_work *xmit_work;
struct kthread_worker *xmit_worker;
xmit_work_fn = tagger_data->xmit_work_fn;
xmit_worker = priv->xmit_worker;
if (!xmit_work_fn || !xmit_worker)
return NULL;
xmit_work = kzalloc(sizeof(*xmit_work), GFP_ATOMIC);
if (!xmit_work)
return NULL;
kthread_init_work(&xmit_work->work, xmit_work_fn);
/* Increase refcount so the kfree_skb in dsa_user_xmit
* won't really free the packet.
*/
xmit_work->dp = dp;
xmit_work->skb = skb_get(skb);
kthread_queue_work(xmit_worker, &xmit_work->work);
return NULL;
}
/* Send VLAN tags with a TPID that blends in with whatever VLAN protocol a
* bridge spanning ports of this switch might have.
*/
static u16 sja1105_xmit_tpid(struct dsa_port *dp)
{
struct dsa_switch *ds = dp->ds;
struct dsa_port *other_dp;
u16 proto;
/* Since VLAN awareness is global, then if this port is VLAN-unaware,
* all ports are. Use the VLAN-unaware TPID used for tag_8021q.
*/
if (!dsa_port_is_vlan_filtering(dp))
return ETH_P_SJA1105;
/* Port is VLAN-aware, so there is a bridge somewhere (a single one,
* we're sure about that). It may not be on this port though, so we
* need to find it.
*/
dsa_switch_for_each_port(other_dp, ds) {
struct net_device *br = dsa_port_bridge_dev_get(other_dp);
if (!br)
continue;
/* Error is returned only if CONFIG_BRIDGE_VLAN_FILTERING,
* which seems pointless to handle, as our port cannot become
* VLAN-aware in that case.
*/
br_vlan_get_proto(br, &proto);
return proto;
}
WARN_ONCE(1, "Port is VLAN-aware but cannot find associated bridge!\n");
return ETH_P_SJA1105;
}
static struct sk_buff *sja1105_imprecise_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct dsa_port *dp = dsa_user_to_port(netdev);
unsigned int bridge_num = dsa_port_bridge_num_get(dp);
struct net_device *br = dsa_port_bridge_dev_get(dp);
u16 tx_vid;
/* If the port is under a VLAN-aware bridge, just slide the
* VLAN-tagged packet into the FDB and hope for the best.
* This works because we support a single VLAN-aware bridge
* across the entire dst, and its VLANs cannot be shared with
* any standalone port.
*/
if (br_vlan_enabled(br))
return skb;
/* If the port is under a VLAN-unaware bridge, use an imprecise
* TX VLAN that targets the bridge's entire broadcast domain,
* instead of just the specific port.
*/
tx_vid = dsa_tag_8021q_bridge_vid(bridge_num);
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), tx_vid);
}
/* Transform untagged control packets into pvid-tagged control packets so that
* all packets sent by this tagger are VLAN-tagged and we can configure the
* switch to drop untagged packets coming from the DSA conduit.
*/
static struct sk_buff *sja1105_pvid_tag_control_pkt(struct dsa_port *dp,
struct sk_buff *skb, u8 pcp)
{
__be16 xmit_tpid = htons(sja1105_xmit_tpid(dp));
struct vlan_ethhdr *hdr;
/* If VLAN tag is in hwaccel area, move it to the payload
* to deal with both cases uniformly and to ensure that
* the VLANs are added in the right order.
*/
if (unlikely(skb_vlan_tag_present(skb))) {
skb = __vlan_hwaccel_push_inside(skb);
if (!skb)
return NULL;
}
hdr = skb_vlan_eth_hdr(skb);
/* If skb is already VLAN-tagged, leave that VLAN ID in place */
if (hdr->h_vlan_proto == xmit_tpid)
return skb;
return vlan_insert_tag(skb, xmit_tpid, (pcp << VLAN_PRIO_SHIFT) |
SJA1105_DEFAULT_VLAN);
}
static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct dsa_port *dp = dsa_user_to_port(netdev);
u16 queue_mapping = skb_get_queue_mapping(skb);
u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
u16 tx_vid = dsa_tag_8021q_standalone_vid(dp);
if (skb->offload_fwd_mark)
return sja1105_imprecise_xmit(skb, netdev);
/* 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))) {
skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
if (!skb)
return NULL;
return sja1105_defer_xmit(dp, skb);
}
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
((pcp << VLAN_PRIO_SHIFT) | tx_vid));
}
static struct sk_buff *sja1110_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct sk_buff *clone = SJA1105_SKB_CB(skb)->clone;
struct dsa_port *dp = dsa_user_to_port(netdev);
u16 queue_mapping = skb_get_queue_mapping(skb);
u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
u16 tx_vid = dsa_tag_8021q_standalone_vid(dp);
__be32 *tx_trailer;
__be16 *tx_header;
int trailer_pos;
if (skb->offload_fwd_mark)
return sja1105_imprecise_xmit(skb, netdev);
/* Transmitting control packets is done using in-band control
* extensions, while data packets are transmitted using
* tag_8021q TX VLANs.
*/
if (likely(!sja1105_is_link_local(skb)))
return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
((pcp << VLAN_PRIO_SHIFT) | tx_vid));
skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
if (!skb)
return NULL;
skb_push(skb, SJA1110_HEADER_LEN);
dsa_alloc_etype_header(skb, SJA1110_HEADER_LEN);
trailer_pos = skb->len;
tx_header = dsa_etype_header_pos_tx(skb);
tx_trailer = skb_put(skb, SJA1110_TX_TRAILER_LEN);
tx_header[0] = htons(ETH_P_SJA1110);
tx_header[1] = htons(SJA1110_HEADER_HOST_TO_SWITCH |
SJA1110_TX_HEADER_HAS_TRAILER |
SJA1110_TX_HEADER_TRAILER_POS(trailer_pos));
*tx_trailer = cpu_to_be32(SJA1110_TX_TRAILER_PRIO(pcp) |
SJA1110_TX_TRAILER_SWITCHID(dp->ds->index) |
SJA1110_TX_TRAILER_DESTPORTS(BIT(dp->index)));
if (clone) {
u8 ts_id = SJA1105_SKB_CB(clone)->ts_id;
tx_header[1] |= htons(SJA1110_TX_HEADER_TAKE_TS);
*tx_trailer |= cpu_to_be32(SJA1110_TX_TRAILER_TSTAMP_ID(ts_id));
}
return skb;
}
static void sja1105_transfer_meta(struct sk_buff *skb,
const struct sja1105_meta *meta)
{
struct ethhdr *hdr = eth_hdr(skb);
hdr->h_dest[3] = meta->dmac_byte_3;
hdr->h_dest[4] = meta->dmac_byte_4;
SJA1105_SKB_CB(skb)->tstamp = meta->tstamp;
}
/* This is a simple state machine which follows the hardware mechanism of
* generating RX timestamps:
*
* After each timestampable skb (all traffic for which send_meta1 and
* send_meta0 is true, aka all MAC-filtered link-local traffic) a meta frame
* containing a partial timestamp is immediately generated by the switch and
* sent as a follow-up to the link-local frame on the CPU port.
*
* The meta frames have no unique identifier (such as sequence number) by which
* one may pair them to the correct timestampable frame.
* Instead, the switch has internal logic that ensures no frames are sent on
* the CPU port between a link-local timestampable frame and its corresponding
* meta follow-up. It also ensures strict ordering between ports (lower ports
* have higher priority towards the CPU port). For this reason, a per-port
* data structure is not needed/desirable.
*
* This function pairs the link-local frame with its partial timestamp from the
* meta follow-up frame. The full timestamp will be reconstructed later in a
* work queue.
*/
static struct sk_buff
*sja1105_rcv_meta_state_machine(struct sk_buff *skb,
struct sja1105_meta *meta,
bool is_link_local,
bool is_meta)
{
/* Step 1: A timestampable frame was received.
* Buffer it until we get its meta frame.
*/
if (is_link_local) {
struct dsa_port *dp = dsa_user_to_port(skb->dev);
struct sja1105_tagger_private *priv;
struct dsa_switch *ds = dp->ds;
priv = sja1105_tagger_private(ds);
spin_lock(&priv->meta_lock);
/* Was this a link-local frame instead of the meta
* that we were expecting?
*/
if (priv->stampable_skb) {
dev_err_ratelimited(ds->dev,
"Expected meta frame, is %12llx "
"in the DSA conduit multicast filter?\n",
SJA1105_META_DMAC);
kfree_skb(priv->stampable_skb);
}
/* Hold a reference to avoid dsa_switch_rcv
* from freeing the skb.
*/
priv->stampable_skb = skb_get(skb);
spin_unlock(&priv->meta_lock);
/* Tell DSA we got nothing */
return NULL;
/* Step 2: The meta frame arrived.
* Time to take the stampable skb out of the closet, annotate it
* with the partial timestamp, and pretend that we received it
* just now (basically masquerade the buffered frame as the meta
* frame, which serves no further purpose).
*/
} else if (is_meta) {
struct dsa_port *dp = dsa_user_to_port(skb->dev);
struct sja1105_tagger_private *priv;
struct dsa_switch *ds = dp->ds;
struct sk_buff *stampable_skb;
priv = sja1105_tagger_private(ds);
spin_lock(&priv->meta_lock);
stampable_skb = priv->stampable_skb;
priv->stampable_skb = NULL;
/* Was this a meta frame instead of the link-local
* that we were expecting?
*/
if (!stampable_skb) {
dev_err_ratelimited(ds->dev,
"Unexpected meta frame\n");
spin_unlock(&priv->meta_lock);
return NULL;
}
if (stampable_skb->dev != skb->dev) {
dev_err_ratelimited(ds->dev,
"Meta frame on wrong port\n");
spin_unlock(&priv->meta_lock);
return NULL;
}
/* Free the meta frame and give DSA the buffered stampable_skb
* for further processing up the network stack.
*/
kfree_skb(skb);
skb = stampable_skb;
sja1105_transfer_meta(skb, meta);
spin_unlock(&priv->meta_lock);
}
return skb;
}
static bool sja1105_skb_has_tag_8021q(const struct sk_buff *skb)
{
u16 tpid = ntohs(eth_hdr(skb)->h_proto);
return tpid == ETH_P_SJA1105 || tpid == ETH_P_8021Q ||
skb_vlan_tag_present(skb);
}
static bool sja1110_skb_has_inband_control_extension(const struct sk_buff *skb)
{
return ntohs(eth_hdr(skb)->h_proto) == ETH_P_SJA1110;
}
static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
struct net_device *netdev)
{
int source_port = -1, switch_id = -1, vbid = -1, vid = -1;
struct sja1105_meta meta = {0};
struct ethhdr *hdr;
bool is_link_local;
bool is_meta;
hdr = eth_hdr(skb);
is_link_local = sja1105_is_link_local(skb);
is_meta = sja1105_is_meta_frame(skb);
if (is_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];
} else if (is_meta) {
sja1105_meta_unpack(skb, &meta);
source_port = meta.source_port;
switch_id = meta.switch_id;
}
/* Normal data plane traffic and link-local frames are tagged with
* a tag_8021q VLAN which we have to strip
*/
if (sja1105_skb_has_tag_8021q(skb))
dsa_8021q_rcv(skb, &source_port, &switch_id, &vbid, &vid);
else if (source_port == -1 && switch_id == -1)
/* Packets with no source information have no chance of
* getting accepted, drop them straight away.
*/
return NULL;
skb->dev = dsa_tag_8021q_find_user(netdev, source_port, switch_id,
vid, vbid);
if (!skb->dev) {
netdev_warn(netdev, "Couldn't decode source port\n");
return NULL;
}
if (!is_link_local)
dsa_default_offload_fwd_mark(skb);
return sja1105_rcv_meta_state_machine(skb, &meta, is_link_local,
is_meta);
}
static struct sk_buff *sja1110_rcv_meta(struct sk_buff *skb, u16 rx_header)
{
u8 *buf = dsa_etype_header_pos_rx(skb) + SJA1110_HEADER_LEN;
int switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header);
int n_ts = SJA1110_RX_HEADER_N_TS(rx_header);
struct sja1105_tagger_data *tagger_data;
struct net_device *conduit = skb->dev;
struct dsa_port *cpu_dp;
struct dsa_switch *ds;
int i;
cpu_dp = conduit->dsa_ptr;
ds = dsa_switch_find(cpu_dp->dst->index, switch_id);
if (!ds) {
net_err_ratelimited("%s: cannot find switch id %d\n",
conduit->name, switch_id);
return NULL;
}
tagger_data = sja1105_tagger_data(ds);
if (!tagger_data->meta_tstamp_handler)
return NULL;
for (i = 0; i <= n_ts; i++) {
u8 ts_id, source_port, dir;
u64 tstamp;
ts_id = buf[0];
source_port = (buf[1] & GENMASK(7, 4)) >> 4;
dir = (buf[1] & BIT(3)) >> 3;
tstamp = be64_to_cpu(*(__be64 *)(buf + 2));
tagger_data->meta_tstamp_handler(ds, source_port, ts_id, dir,
tstamp);
buf += SJA1110_META_TSTAMP_SIZE;
}
/* Discard the meta frame, we've consumed the timestamps it contained */
return NULL;
}
static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
int *source_port,
int *switch_id,
bool *host_only)
{
u16 rx_header;
if (unlikely(!pskb_may_pull(skb, SJA1110_HEADER_LEN)))
return NULL;
/* skb->data points to skb_mac_header(skb) + ETH_HLEN, which is exactly
* what we need because the caller has checked the EtherType (which is
* located 2 bytes back) and we just need a pointer to the header that
* comes afterwards.
*/
rx_header = ntohs(*(__be16 *)skb->data);
if (rx_header & SJA1110_RX_HEADER_HOST_ONLY)
*host_only = true;
if (rx_header & SJA1110_RX_HEADER_IS_METADATA)
return sja1110_rcv_meta(skb, rx_header);
/* Timestamp frame, we have a trailer */
if (rx_header & SJA1110_RX_HEADER_HAS_TRAILER) {
int start_of_padding = SJA1110_RX_HEADER_TRAILER_POS(rx_header);
u8 *rx_trailer = skb_tail_pointer(skb) - SJA1110_RX_TRAILER_LEN;
u64 *tstamp = &SJA1105_SKB_CB(skb)->tstamp;
u8 last_byte = rx_trailer[12];
/* The timestamp is unaligned, so we need to use packing()
* to get it
*/
packing(rx_trailer, tstamp, 63, 0, 8, UNPACK, 0);
*source_port = SJA1110_RX_TRAILER_SRC_PORT(last_byte);
*switch_id = SJA1110_RX_TRAILER_SWITCH_ID(last_byte);
/* skb->len counts from skb->data, while start_of_padding
* counts from the destination MAC address. Right now skb->data
* is still as set by the DSA conduit, so to trim away the
* padding and trailer we need to account for the fact that
* skb->data points to skb_mac_header(skb) + ETH_HLEN.
*/
if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN))
return NULL;
/* Trap-to-host frame, no timestamp trailer */
} else {
*source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header);
*switch_id = SJA1110_RX_HEADER_SWITCH_ID(rx_header);
}
/* Advance skb->data past the DSA header */
skb_pull_rcsum(skb, SJA1110_HEADER_LEN);
dsa_strip_etype_header(skb, SJA1110_HEADER_LEN);
/* With skb->data in its final place, update the MAC header
* so that eth_hdr() continues to works properly.
*/
skb_set_mac_header(skb, -ETH_HLEN);
return skb;
}
static struct sk_buff *sja1110_rcv(struct sk_buff *skb,
struct net_device *netdev)
{
int source_port = -1, switch_id = -1, vbid = -1, vid = -1;
bool host_only = false;
if (sja1110_skb_has_inband_control_extension(skb)) {
skb = sja1110_rcv_inband_control_extension(skb, &source_port,
&switch_id,
&host_only);
if (!skb)
return NULL;
}
/* Packets with in-band control extensions might still have RX VLANs */
if (likely(sja1105_skb_has_tag_8021q(skb)))
dsa_8021q_rcv(skb, &source_port, &switch_id, &vbid, &vid);
skb->dev = dsa_tag_8021q_find_user(netdev, source_port, switch_id,
vid, vbid);
if (!skb->dev) {
netdev_warn(netdev, "Couldn't decode source port\n");
return NULL;
}
if (!host_only)
dsa_default_offload_fwd_mark(skb);
return skb;
}
static void sja1105_flow_dissect(const struct sk_buff *skb, __be16 *proto,
int *offset)
{
/* No tag added for management frames, all ok */
if (unlikely(sja1105_is_link_local(skb)))
return;
dsa_tag_generic_flow_dissect(skb, proto, offset);
}
static void sja1110_flow_dissect(const struct sk_buff *skb, __be16 *proto,
int *offset)
{
/* Management frames have 2 DSA tags on RX, so the needed_headroom we
* declared is fine for the generic dissector adjustment procedure.
*/
if (unlikely(sja1105_is_link_local(skb)))
return dsa_tag_generic_flow_dissect(skb, proto, offset);
/* For the rest, there is a single DSA tag, the tag_8021q one */
*offset = VLAN_HLEN;
*proto = ((__be16 *)skb->data)[(VLAN_HLEN / 2) - 1];
}
static void sja1105_disconnect(struct dsa_switch *ds)
{
struct sja1105_tagger_private *priv = ds->tagger_data;
kthread_destroy_worker(priv->xmit_worker);
kfree(priv);
ds->tagger_data = NULL;
}
static int sja1105_connect(struct dsa_switch *ds)
{
struct sja1105_tagger_private *priv;
struct kthread_worker *xmit_worker;
int err;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
spin_lock_init(&priv->meta_lock);
xmit_worker = kthread_create_worker(0, "dsa%d:%d_xmit",
ds->dst->index, ds->index);
if (IS_ERR(xmit_worker)) {
err = PTR_ERR(xmit_worker);
kfree(priv);
return err;
}
priv->xmit_worker = xmit_worker;
ds->tagger_data = priv;
return 0;
}
static const struct dsa_device_ops sja1105_netdev_ops = {
.name = SJA1105_NAME,
.proto = DSA_TAG_PROTO_SJA1105,
.xmit = sja1105_xmit,
.rcv = sja1105_rcv,
.connect = sja1105_connect,
.disconnect = sja1105_disconnect,
.needed_headroom = VLAN_HLEN,
.flow_dissect = sja1105_flow_dissect,
.promisc_on_conduit = true,
};
DSA_TAG_DRIVER(sja1105_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1105, SJA1105_NAME);
static const struct dsa_device_ops sja1110_netdev_ops = {
.name = SJA1110_NAME,
.proto = DSA_TAG_PROTO_SJA1110,
.xmit = sja1110_xmit,
.rcv = sja1110_rcv,
.connect = sja1105_connect,
.disconnect = sja1105_disconnect,
.flow_dissect = sja1110_flow_dissect,
.needed_headroom = SJA1110_HEADER_LEN + VLAN_HLEN,
.needed_tailroom = SJA1110_RX_TRAILER_LEN + SJA1110_MAX_PADDING_LEN,
};
DSA_TAG_DRIVER(sja1110_netdev_ops);
MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_SJA1110, SJA1110_NAME);
static struct dsa_tag_driver *sja1105_tag_driver_array[] = {
&DSA_TAG_DRIVER_NAME(sja1105_netdev_ops),
&DSA_TAG_DRIVER_NAME(sja1110_netdev_ops),
};
module_dsa_tag_drivers(sja1105_tag_driver_array);
MODULE_DESCRIPTION("DSA tag driver for NXP SJA1105 switches");
MODULE_LICENSE("GPL v2");
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