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sfc: support GRE TSO on EF100 

We can treat SKB_GSO_GRE almost exactly the same as UDP tunnels, except
 that we don't want to edit the outer UDP len (as there isn't one).
For SKB_GSO_GRE_CSUM, we have to use GSO_PARTIAL as the device doesn't
 support offload of non-UDP outer L4 checksums.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Martin Habets <mhabets@solarflare.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
This commit is contained in:
Edward Cree 2020-11-12 15:20:05 +00:00 committed by Jakub Kicinski
parent 42bfd69a9f
commit c5122cf584
2 changed files with 11 additions and 2 deletions
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7
drivers/net/ethernet/sfc/ef100_nic.c
View File

@ -185,11 +185,16 @@ static int efx_ef100_init_datapath_caps(struct efx_nic *efx)
if (efx_ef100_has_cap(nic_data->datapath_caps2, TX_TSO_V3)) {
struct net_device *net_dev = efx->net_dev;
netdev_features_t tso = NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_GSO_PARTIAL |
NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM;
NETIF_F_GSO_UDP_TUNNEL | NETIF_F_GSO_UDP_TUNNEL_CSUM |
NETIF_F_GSO_GRE | NETIF_F_GSO_GRE_CSUM;
net_dev->features |= tso;
net_dev->hw_features |= tso;
net_dev->hw_enc_features |= tso;
/* EF100 HW can only offload outer checksums if they are UDP,
* so for GRE_CSUM we have to use GSO_PARTIAL.
*/
net_dev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
}
efx->num_mac_stats = MCDI_WORD(outbuf,
GET_CAPABILITIES_V4_OUT_MAC_STATS_NUM_STATS);

6
drivers/net/ethernet/sfc/ef100_tx.c
View File

@ -194,6 +194,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
u16 vlan_tci = skb_vlan_tag_get(skb);
u32 mss = skb_shinfo(skb)->gso_size;
bool encap = skb->encapsulation;
bool udp_encap = false;
u16 vlan_enable = 0;
struct tcphdr *tcp;
bool outer_csum;
@ -212,6 +213,9 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
outer_l4_offset = skb_transport_offset(skb);
ip_offset = skb_inner_network_offset(skb);
tcp_offset = skb_inner_transport_offset(skb);
if (skb_shinfo(skb)->gso_type &
(SKB_GSO_UDP_TUNNEL | SKB_GSO_UDP_TUNNEL_CSUM))
udp_encap = true;
} else {
ip_offset = skb_network_offset(skb);
tcp_offset = skb_transport_offset(skb);
@ -239,7 +243,7 @@ static void ef100_make_tso_desc(struct efx_nic *efx,
ESF_GZ_TX_TSO_ED_INNER_IP_LEN, 1,
ESF_GZ_TX_TSO_OUTER_L3_OFF_W, outer_ip_offset >> 1,
ESF_GZ_TX_TSO_OUTER_L4_OFF_W, outer_l4_offset >> 1,
ESF_GZ_TX_TSO_ED_OUTER_UDP_LEN, encap && !gso_partial,
ESF_GZ_TX_TSO_ED_OUTER_UDP_LEN, udp_encap && !gso_partial,
ESF_GZ_TX_TSO_ED_OUTER_IP_LEN, encap && !gso_partial,
ESF_GZ_TX_TSO_ED_OUTER_IP4_ID, encap ? mangleid :
ESE_GZ_TX_DESC_IP4_ID_NO_OP,