Re: [PATCH net v5] net: stmmac: remove software VLAN tag stripping

[Maxime Chevallier <maxime.chevallier@bootlin.com>]

Hi,

On 9/4/26 02:45, he.peilin@zte.com.cn wrote:
> The software VLAN stripping logic in stmmac_rx_vlan() was originally
> introduced in 2014 by commit b93819854d6e ("stmmac: Add vlan rx for
> better GRO performance.") as a workaround to improve GRO performance,
> since at that time GRO could not handle frames with VLAN tags. However,
> this limitation was resolved in 2015 by commit 66e5133f19e9 ("vlan: Add
> GRO support for non hardware accelerated vlan"), which added GRO support
> for non-hardware-accelerated VLAN frames. Keeping a software fallback
> path for VLAN stripping is no longer necessary and only adds complexity.
> 
> Fixes: b93819854d6e ("stmmac: Add vlan rx for better GRO performance.")
> Signed-off-by: Peilin He <he.peilin@zte.com.cn>
> Reviewed-by: xu xin <xu.xin16@zte.com.cn>
> Reviewed-by: Jiang Kun <jiang.kun2@zte.com.cn>
> ---
> ../net/ethernet/stmicro/stmmac/stmmac_main.c | 28 ++-----------------
> 1 file changed, 2 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index b2b7d0242dd3..2e3b0cf10d66 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -5021,24 +5021,6 @@ static netdev_features_t stmmac_features_check(struct sk_buff *skb,
> return vlan_features_check(skb, features);
> }
> 
> -static void stmmac_rx_vlan(struct net_device *dev, struct sk_buff *skb)
> -{
> -   struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
> -   __be16 vlan_proto = veth->h_vlan_proto;
> -   u16 vlanid;
> -
> -   if ((vlan_proto == htons(ETH_P_8021Q) &&
> -        dev->features & NETIF_F_HW_VLAN_CTAG_RX) ||
> -       (vlan_proto == htons(ETH_P_8021AD) &&
> -        dev->features & NETIF_F_HW_VLAN_STAG_RX)) {
> -       /* pop the vlan tag */
> -       vlanid = ntohs(veth->h_vlan_TCI);
> -       memmove(skb->data + VLAN_HLEN, veth, ETH_ALEN * 2);
> -       skb_pull(skb, VLAN_HLEN);
> -       __vlan_hwaccel_put_tag(skb, vlan_proto, vlanid);
> -   }
> -}

This is still not looking right, make sure you use the correct tools to
send your patches, either "git format-patch + git send-email" or "b4" :

https://docs.kernel.org/process/submitting-patches.html#submittingpatches

For b4 :

https://b4.docs.kernel.org/en/latest/contributor/overview.html

Thanks,

Maxime