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net/mlx5e: Rx, Fix checksum calculation for new hardware

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CQE checksum full mode in new HW, provides a full checksum of rx frame.
Covering bytes starting from eth protocol up to last byte in the received
frame (frame_size - ETH_HLEN), as expected by the stack.

Fixing up skb->csum by the driver is not required in such case. This fix
is to avoid wrong checksum calculation in drivers which already support
the new hardware with the new checksum mode.

Fixes: 85327a9c41 ("net/mlx5: Update the list of the PCI supported devices")
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Saeed Mahameed 2019-05-03 13:14:59 -07:00
parent 914adbb1bc
commit db849faa9b
4 changed files with 12 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/net/ethernet/mellanox/mlx5/core/en.h
View file

@ -294,6 +294,7 @@ enum {
MLX5E_RQ_STATE_ENABLED,
MLX5E_RQ_STATE_AM,
MLX5E_RQ_STATE_NO_CSUM_COMPLETE,
MLX5E_RQ_STATE_CSUM_FULL, /* cqe_csum_full hw bit is set */
};
struct mlx5e_cq {

3
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View file

@ -855,6 +855,9 @@ static int mlx5e_open_rq(struct mlx5e_channel *c,
if (err)
goto err_destroy_rq;
if (MLX5_CAP_ETH(c->mdev, cqe_checksum_full))
__set_bit(MLX5E_RQ_STATE_CSUM_FULL, &c->rq.state);
if (params->rx_dim_enabled)
__set_bit(MLX5E_RQ_STATE_AM, &c->rq.state);

7
drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
View file

@ -873,8 +873,14 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
if (unlikely(get_ip_proto(skb, network_depth, proto) == IPPROTO_SCTP))
goto csum_unnecessary;
stats->csum_complete++;
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
if (test_bit(MLX5E_RQ_STATE_CSUM_FULL, &rq->state))
return; /* CQE csum covers all received bytes */
/* csum might need some fixups ...*/
if (network_depth > ETH_HLEN)
/* CQE csum is calculated from the IP header and does
* not cover VLAN headers (if present). This will add
@ -885,7 +891,6 @@ static inline void mlx5e_handle_csum(struct net_device *netdev,
skb->csum);
mlx5e_skb_padding_csum(skb, network_depth, proto, stats);
stats->csum_complete++;
return;
}

3
include/linux/mlx5/mlx5_ifc.h
View file

@ -749,7 +749,8 @@ struct mlx5_ifc_per_protocol_networking_offload_caps_bits {
u8 swp[0x1];
u8 swp_csum[0x1];
u8 swp_lso[0x1];
u8 reserved_at_23[0xd];
u8 cqe_checksum_full[0x1];
u8 reserved_at_24[0xc];
u8 max_vxlan_udp_ports[0x8];
u8 reserved_at_38[0x6];
u8 max_geneve_opt_len[0x1];