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net: vlan: introduce skb_vlan_eth_hdr()

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Similar to skb_eth_hdr() introduced in commit 96cc4b6958 ("macvlan: do
not assume mac_header is set in macvlan_broadcast()"), let's introduce a
skb_vlan_eth_hdr() helper which can be used in TX-only code paths to get
to the VLAN header based on skb->data rather than based on the
skb_mac_header(skb).

We also consolidate the drivers that dereference skb->data to go through
this helper.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2023-04-21 01:55:54 +03:00 committed by David S. Miller
parent f90615ada0
commit 1f5020acb3
12 changed files with 24 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
View File

@ -1935,8 +1935,7 @@ u16 bnx2x_select_queue(struct net_device *dev, struct sk_buff *skb,
/* Skip VLAN tag if present */
if (ether_type == ETH_P_8021Q) {
struct vlan_ethhdr *vhdr =
(struct vlan_ethhdr *)skb->data;
struct vlan_ethhdr *vhdr = skb_vlan_eth_hdr(skb);
ether_type = ntohs(vhdr->h_vlan_encapsulated_proto);
}

2
drivers/net/ethernet/emulex/benet/be_main.c
View File

@ -1124,7 +1124,7 @@ static struct sk_buff *be_lancer_xmit_workarounds(struct be_adapter *adapter,
struct be_wrb_params
*wrb_params)
{
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
struct vlan_ethhdr *veh = skb_vlan_eth_hdr(skb);
unsigned int eth_hdr_len;
struct iphdr *ip;

2
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View File

@ -1532,7 +1532,7 @@ static int hns3_handle_vtags(struct hns3_enet_ring *tx_ring,
if (unlikely(rc < 0))
return rc;
vhdr = (struct vlan_ethhdr *)skb->data;
vhdr = skb_vlan_eth_hdr(skb);
vhdr->h_vlan_TCI |= cpu_to_be16((skb->priority << VLAN_PRIO_SHIFT)
& VLAN_PRIO_MASK);

2
drivers/net/ethernet/intel/i40e/i40e_txrx.c
View File

@ -3063,7 +3063,7 @@ static inline int i40e_tx_prepare_vlan_flags(struct sk_buff *skb,
rc = skb_cow_head(skb, 0);
if (rc < 0)
return rc;
vhdr = (struct vlan_ethhdr *)skb->data;
vhdr = skb_vlan_eth_hdr(skb);
vhdr->h_vlan_TCI = htons(tx_flags >>
I40E_TX_FLAGS_VLAN_SHIFT);
} else {

2
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -8798,7 +8798,7 @@ netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
if (skb_cow_head(skb, 0))
goto out_drop;
vhdr = (struct vlan_ethhdr *)skb->data;
vhdr = skb_vlan_eth_hdr(skb);
vhdr->h_vlan_TCI = htons(tx_flags >>
IXGBE_TX_FLAGS_VLAN_SHIFT);
} else {

2
drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
View File

@ -1854,7 +1854,7 @@ netxen_tso_check(struct net_device *netdev,
if (protocol == cpu_to_be16(ETH_P_8021Q)) {
vh = (struct vlan_ethhdr *)skb->data;
vh = skb_vlan_eth_hdr(skb);
protocol = vh->h_vlan_encapsulated_proto;
flags = FLAGS_VLAN_TAGGED;

4
drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c
View File

@ -318,7 +318,7 @@ static void qlcnic_send_filter(struct qlcnic_adapter *adapter,
if (adapter->flags & QLCNIC_VLAN_FILTERING) {
if (protocol == ETH_P_8021Q) {
vh = (struct vlan_ethhdr *)skb->data;
vh = skb_vlan_eth_hdr(skb);
vlan_id = ntohs(vh->h_vlan_TCI);
} else if (skb_vlan_tag_present(skb)) {
vlan_id = skb_vlan_tag_get(skb);
@ -468,7 +468,7 @@ static int qlcnic_tx_pkt(struct qlcnic_adapter *adapter,
u32 producer = tx_ring->producer;
if (protocol == ETH_P_8021Q) {
vh = (struct vlan_ethhdr *)skb->data;
vh = skb_vlan_eth_hdr(skb);
flags = QLCNIC_FLAGS_VLAN_TAGGED;
vlan_tci = ntohs(vh->h_vlan_TCI);
protocol = ntohs(vh->h_vlan_encapsulated_proto);

2
drivers/net/ethernet/sfc/tx_tso.c
View File

@ -147,7 +147,7 @@ static __be16 efx_tso_check_protocol(struct sk_buff *skb)
EFX_WARN_ON_ONCE_PARANOID(((struct ethhdr *)skb->data)->h_proto !=
protocol);
if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
struct vlan_ethhdr *veh = skb_vlan_eth_hdr(skb);
protocol = veh->h_vlan_encapsulated_proto;
}

7
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
View File

@ -4569,13 +4569,10 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
static void stmmac_rx_vlan(struct net_device *dev, struct sk_buff *skb)
{
struct vlan_ethhdr *veth;
__be16 vlan_proto;
struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
__be16 vlan_proto = veth->h_vlan_proto;
u16 vlanid;
veth = (struct vlan_ethhdr *)skb->data;
vlan_proto = veth->h_vlan_proto;
if ((vlan_proto == htons(ETH_P_8021Q) &&
dev->features & NETIF_F_HW_VLAN_CTAG_RX) ||
(vlan_proto == htons(ETH_P_8021AD) &&

4
drivers/staging/gdm724x/gdm_lte.c
View File

@ -349,7 +349,7 @@ static s32 gdm_lte_tx_nic_type(struct net_device *dev, struct sk_buff *skb)
/* Get ethernet protocol */
eth = (struct ethhdr *)skb->data;
if (ntohs(eth->h_proto) == ETH_P_8021Q) {
vlan_eth = (struct vlan_ethhdr *)skb->data;
vlan_eth = skb_vlan_eth_hdr(skb);
mac_proto = ntohs(vlan_eth->h_vlan_encapsulated_proto);
network_data = skb->data + VLAN_ETH_HLEN;
nic_type |= NIC_TYPE_F_VLAN;
@ -435,7 +435,7 @@ static netdev_tx_t gdm_lte_tx(struct sk_buff *skb, struct net_device *dev)
* driver based on the NIC mac
*/
if (nic_type & NIC_TYPE_F_VLAN) {
struct vlan_ethhdr *vlan_eth = (struct vlan_ethhdr *)skb->data;
struct vlan_ethhdr *vlan_eth = skb_vlan_eth_hdr(skb);
nic->vlan_id = ntohs(vlan_eth->h_vlan_TCI) & VLAN_VID_MASK;
data_buf = skb->data + (VLAN_ETH_HLEN - ETH_HLEN);

12
include/linux/if_vlan.h
View File

@ -62,6 +62,14 @@ static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
return (struct vlan_ethhdr *)skb_mac_header(skb);
}
/* Prefer this version in TX path, instead of
* skb_reset_mac_header() + vlan_eth_hdr()
*/
static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb)
{
return (struct vlan_ethhdr *)skb->data;
}
#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT 13
#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */
@ -529,7 +537,7 @@ static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
*/
static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
{
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
if (!eth_type_vlan(veth->h_vlan_proto))
return -EINVAL;
@ -713,7 +721,7 @@ static inline bool skb_vlan_tagged_multi(struct sk_buff *skb)
if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN)))
return false;
veh = (struct vlan_ethhdr *)skb->data;
veh = skb_vlan_eth_hdr(skb);
protocol = veh->h_vlan_encapsulated_proto;
}

2
net/batman-adv/soft-interface.c
View File

@ -439,7 +439,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
goto dropped;
vhdr = (struct vlan_ethhdr *)skb->data;
vhdr = skb_vlan_eth_hdr(skb);
/* drop batman-in-batman packets to prevent loops */
if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN))