sfc: correctly advertise tunneled IPv6 segmentation

[ Upstream commit ffffd2454a7a1bc9f7242b12c4cc0b05c12692b4 ]

Recent sfc NICs are TSO capable for some tunnel protocols. However, it
was not working properly because the feature was not advertised in
hw_enc_features, but in hw_features only.

Setting up a GENEVE tunnel and using iperf3 to send IPv4 and IPv6 traffic
to the tunnel show, with tcpdump, that the IPv4 packets still had ~64k
size but the IPv6 ones had only ~1500 bytes (they had been segmented by
software, not offloaded). With this patch segmentation is offloaded as
expected and the traffic is correctly received at the other end.

Fixes: 24b2c3751aa3 ("sfc: advertise encapsulated offloads on EF10")
Reported-by: Tianhao Zhao <tizhao@redhat.com>
Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Acked-by: Martin Habets <habetsm.xilinx@gmail.com>
Link: https://lore.kernel.org/r/20230125143513.25841-1-ihuguet@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 0556542..3a86f12 100644 (file)
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -1003,8 +1003,11 @@ static int efx_pci_probe_post_io(struct efx_nic *efx)
        /* Determine netdevice features */
        net_dev->features |= (efx->type->offload_features | NETIF_F_SG |
                              NETIF_F_TSO | NETIF_F_RXCSUM | NETIF_F_RXALL);
-       if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM))
+       if (efx->type->offload_features & (NETIF_F_IPV6_CSUM | NETIF_F_HW_CSUM)) {
                net_dev->features |= NETIF_F_TSO6;
+               if (efx_has_cap(efx, TX_TSO_V2_ENCAP))
+                       net_dev->hw_enc_features |= NETIF_F_TSO6;
+       }
        /* Check whether device supports TSO */
        if (!efx->type->tso_versions || !efx->type->tso_versions(efx))
                net_dev->features &= ~NETIF_F_ALL_TSO;