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-rw-r--r--include/linux/dsa/8021q.h16
-rw-r--r--net/dsa/tag_8021q.c57
-rw-r--r--net/dsa/tag_sja1105.c19
3 files changed, 53 insertions, 39 deletions
diff --git a/include/linux/dsa/8021q.h b/include/linux/dsa/8021q.h
index 3911e0586478..0aa803c451a3 100644
--- a/include/linux/dsa/8021q.h
+++ b/include/linux/dsa/8021q.h
@@ -20,9 +20,6 @@ int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int index,
struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
u16 tpid, u16 tci);
-struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,
- struct packet_type *pt, u16 *tpid, u16 *tci);
-
u16 dsa_8021q_tx_vid(struct dsa_switch *ds, int port);
u16 dsa_8021q_rx_vid(struct dsa_switch *ds, int port);
@@ -31,6 +28,8 @@ int dsa_8021q_rx_switch_id(u16 vid);
int dsa_8021q_rx_source_port(u16 vid);
+struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb);
+
#else
int dsa_port_setup_8021q_tagging(struct dsa_switch *ds, int index,
@@ -45,12 +44,6 @@ struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
return NULL;
}
-struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,
- struct packet_type *pt, u16 *tpid, u16 *tci)
-{
- return NULL;
-}
-
u16 dsa_8021q_tx_vid(struct dsa_switch *ds, int port)
{
return 0;
@@ -71,6 +64,11 @@ int dsa_8021q_rx_source_port(u16 vid)
return 0;
}
+struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)
+{
+ return NULL;
+}
+
#endif /* IS_ENABLED(CONFIG_NET_DSA_TAG_8021Q) */
#endif /* _NET_DSA_8021Q_H */
diff --git a/net/dsa/tag_8021q.c b/net/dsa/tag_8021q.c
index 65a35e976d7b..6ebbd799c4eb 100644
--- a/net/dsa/tag_8021q.c
+++ b/net/dsa/tag_8021q.c
@@ -235,31 +235,48 @@ struct sk_buff *dsa_8021q_xmit(struct sk_buff *skb, struct net_device *netdev,
}
EXPORT_SYMBOL_GPL(dsa_8021q_xmit);
-struct sk_buff *dsa_8021q_rcv(struct sk_buff *skb, struct net_device *netdev,
- struct packet_type *pt, u16 *tpid, u16 *tci)
+/* In the DSA packet_type handler, skb->data points in the middle of the VLAN
+ * tag, after tpid and before tci. This is because so far, ETH_HLEN
+ * (DMAC, SMAC, EtherType) bytes were pulled.
+ * There are 2 bytes of VLAN tag left in skb->data, and upper
+ * layers expect the 'real' EtherType to be consumed as well.
+ * Coincidentally, a VLAN header is also of the same size as
+ * the number of bytes that need to be pulled.
+ *
+ * skb_mac_header skb->data
+ * | |
+ * v v
+ * | | | | | | | | | | | | | | | | | | |
+ * +-----------------------+-----------------------+-------+-------+-------+
+ * | Destination MAC | Source MAC | TPID | TCI | EType |
+ * +-----------------------+-----------------------+-------+-------+-------+
+ * ^ | |
+ * |<--VLAN_HLEN-->to <---VLAN_HLEN--->
+ * from |
+ * >>>>>>> v
+ * >>>>>>> | | | | | | | | | | | | | | |
+ * >>>>>>> +-----------------------+-----------------------+-------+
+ * >>>>>>> | Destination MAC | Source MAC | EType |
+ * +-----------------------+-----------------------+-------+
+ * ^ ^
+ * (now part of | |
+ * skb->head) skb_mac_header skb->data
+ */
+struct sk_buff *dsa_8021q_remove_header(struct sk_buff *skb)
{
- struct vlan_ethhdr *tag;
-
- if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
- return NULL;
+ u8 *from = skb_mac_header(skb);
+ u8 *dest = from + VLAN_HLEN;
- tag = vlan_eth_hdr(skb);
- *tpid = ntohs(tag->h_vlan_proto);
- *tci = ntohs(tag->h_vlan_TCI);
-
- /* skb->data points in the middle of the VLAN tag,
- * after tpid and before tci. This is because so far,
- * ETH_HLEN (DMAC, SMAC, EtherType) bytes were pulled.
- * There are 2 bytes of VLAN tag left in skb->data, and upper
- * layers expect the 'real' EtherType to be consumed as well.
- * Coincidentally, a VLAN header is also of the same size as
- * the number of bytes that need to be pulled.
- */
- skb_pull_rcsum(skb, VLAN_HLEN);
+ memmove(dest, from, ETH_HLEN - VLAN_HLEN);
+ skb_pull(skb, VLAN_HLEN);
+ skb_push(skb, ETH_HLEN);
+ skb_reset_mac_header(skb);
+ skb_reset_mac_len(skb);
+ skb_pull_rcsum(skb, ETH_HLEN);
return skb;
}
-EXPORT_SYMBOL_GPL(dsa_8021q_rcv);
+EXPORT_SYMBOL_GPL(dsa_8021q_remove_header);
static const struct dsa_device_ops dsa_8021q_netdev_ops = {
.name = "8021q",
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index d43737e6c3fb..77eeea004e92 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -66,17 +66,14 @@ 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;
+ int source_port, switch_id;
+ struct vlan_ethhdr *hdr;
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;
+ hdr = vlan_eth_hdr(skb);
+ tpid = ntohs(hdr->h_vlan_proto);
+ is_tagged = (tpid == ETH_P_SJA1105);
skb->offload_fwd_mark = 1;
@@ -92,8 +89,11 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
hdr->h_dest[4] = 0;
} else {
/* Normal traffic path. */
+ tci = ntohs(hdr->h_vlan_TCI);
+ vid = tci & VLAN_VID_MASK;
source_port = dsa_8021q_rx_source_port(vid);
switch_id = dsa_8021q_rx_switch_id(vid);
+ skb->priority = (tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
}
skb->dev = dsa_master_find_slave(netdev, switch_id, source_port);
@@ -106,8 +106,7 @@ static struct sk_buff *sja1105_rcv(struct sk_buff *skb,
* 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);
+ skb = dsa_8021q_remove_header(skb);
return skb;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-23 19:36:51 +0000