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net/mlx5e: IPsec: Fix work queue entry ethernet segment checksum flags

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Current Work Queue Entry (WQE) checksum (csum) flags in the ethernet
segment (eseg) in case of IPsec crypto offload datapath are not aligned
with PRM/HW expectations.

Currently the driver always sets the l3_inner_csum flag in case of IPsec
because of the wrong usage of skb->encapsulation as indicator for inner
IPsec header since skb->encapsulation is always ON for IPsec packets
since IPsec itself is an encapsulation protocol. The above forced a
failing attempts of calculating csum of non-existing segments (like in
the IP|ESP|TCP packet case which does not have an l3_inner) which led
to lots of packet drops hence the low throughput.

Fix by using xo->inner_ipproto as indicator for inner IPsec header
instead of skb->encapsulation in addition to setting the csum flags
as following:
* Tunnel Mode:
* Pkt: MAC  IP     ESP  IP    L4
* CSUM: l3_cs | l3_inner_cs | l4_inner_cs
*
* Transport Mode:
* Pkt: MAC  IP     ESP  L4
* CSUM: l3_cs [ | l4_cs (checksum partial case)]
*
* Tunnel(VXLAN TCP/UDP) over Transport Mode
* Pkt: MAC  IP     ESP  UDP  VXLAN  IP    L4
* CSUM: l3_cs | l3_inner_cs | l4_inner_cs

Fixes: f1267798c9 ("net/mlx5: Fix checksum issue of VXLAN and IPsec crypto offload")
Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Emeel Hakim 2021-10-18 15:31:19 +03:00 committed by Saeed Mahameed
parent d10457f85d
commit 1d00032394
1 changed files with 11 additions and 9 deletions
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20
drivers/net/ethernet/mellanox/mlx5/core/en_tx.c
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@ -213,19 +213,18 @@ static inline void mlx5e_insert_vlan(void *start, struct sk_buff *skb, u16 ihs)
memcpy(&vhdr->h_vlan_encapsulated_proto, skb->data + cpy1_sz, cpy2_sz);
}
/* If packet is not IP's CHECKSUM_PARTIAL (e.g. icmd packet),
* need to set L3 checksum flag for IPsec
*/
static void
ipsec_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
struct mlx5_wqe_eth_seg *eseg)
{
struct xfrm_offload *xo = xfrm_offload(skb);
eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM;
if (skb->encapsulation) {
eseg->cs_flags |= MLX5_ETH_WQE_L3_INNER_CSUM;
if (xo->inner_ipproto) {
eseg->cs_flags |= MLX5_ETH_WQE_L4_INNER_CSUM | MLX5_ETH_WQE_L3_INNER_CSUM;
} else if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
eseg->cs_flags |= MLX5_ETH_WQE_L4_CSUM;
sq->stats->csum_partial_inner++;
} else {
sq->stats->csum_partial++;
}
}
@ -234,6 +233,11 @@ mlx5e_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
struct mlx5e_accel_tx_state *accel,
struct mlx5_wqe_eth_seg *eseg)
{
if (unlikely(mlx5e_ipsec_eseg_meta(eseg))) {
ipsec_txwqe_build_eseg_csum(sq, skb, eseg);
return;
}
if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM;
if (skb->encapsulation) {
@ -249,8 +253,6 @@ mlx5e_txwqe_build_eseg_csum(struct mlx5e_txqsq *sq, struct sk_buff *skb,
eseg->cs_flags = MLX5_ETH_WQE_L3_CSUM | MLX5_ETH_WQE_L4_CSUM;
sq->stats->csum_partial++;
#endif
} else if (unlikely(mlx5e_ipsec_eseg_meta(eseg))) {
ipsec_txwqe_build_eseg_csum(sq, skb, eseg);
} else
sq->stats->csum_none++;
}