On Mon, Dec 3, 2018 at 11:51 PM Eric Dumazet <[email protected]> wrote:
> > If it really validates L3/L4 checksum, then a full-packet checksum
> > is not needed.
>
> Yes, this is exactly what CHECKSUM_UNNECESSARY means.
> linux stack does not have to perform the check another time.
So you are suggesting to get rid of CHECKSUM_COMPLETE, right?
Like below:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 7cb988640c9c..b9626c8b6b91 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -764,32 +764,6 @@ static inline void mlx5e_handle_csum(struct
net_device *netdev,
return;
}
- if (unlikely(test_bit(MLX5E_RQ_STATE_NO_CSUM_COMPLETE, &rq->state)))
- goto csum_unnecessary;
-
- if (likely(is_last_ethertype_ip(skb, &network_depth, &proto))) {
- if (unlikely(get_ip_proto(skb, network_depth, proto)
== IPPROTO_SCTP))
- goto csum_unnecessary;
-
- skb->ip_summed = CHECKSUM_COMPLETE;
- skb->csum = csum_unfold((__force __sum16)cqe->check_sum);
- if (network_depth > ETH_HLEN)
- /* CQE csum is calculated from the IP header and does
- * not cover VLAN headers (if present). This will add
- * the checksum manually.
- */
- skb->csum = csum_partial(skb->data + ETH_HLEN,
- network_depth - ETH_HLEN,
- skb->csum);
- if (unlikely(netdev->features & NETIF_F_RXFCS))
- skb->csum = csum_block_add(skb->csum,
- (__force
__wsum)mlx5e_get_fcs(skb),
- skb->len - ETH_FCS_LEN);
- stats->csum_complete++;
- return;
- }
-
-csum_unnecessary:
>
> For example, no call to csum_partial() is needed, even for IPv6+TCP or
> IPv6+UDP
Sure, if you mean to get rid of CHECKSUM_COMPLETE.
Remember you fixed CHECKSUM_COMPLETE too when you touch it,
see d48051c5b837 ("net/mlx5e: fix csum adjustments caused by RXFCS").
So why didn't you remove CHECKSUM_COMPLETE but fixed it instead?
Thanks.
