On Wed, 6 Feb 2019 00:06:33 +0000 Saeed Mahameed <sae...@mellanox.com> wrote:
> 3) Unrelated, In non XDP case, if skb allocation fails or driver fails > to pass the skb up to the stack for somereason, should the driver > increase rx packets ? IMHO the answer should be yes if we want to have > similar behavior between XDP and non XDP cases. I don't think "skb allocation fails" should increase rx packets counter. The difference is that these events are outside sysadm/users control, and is an error detected inside the driver. The XDP program takes a policy choice to XDP_DROP a packet, which can be accounted inside the XDP prog (as the samples show) or as we also discuss via a more generic XDP-action counters. That said, I took at quick look at driver code, and it seems this behavior differs per driver... ixgbe and mlx5 does not count "skb allocation fails" as RX-ed packets, while mlx4 seems to count them. > But this could result in netdev->stats.rx_packets + > netdev->stats.rx_dropped to be more than the actual rx-ed packets, is > this acceptable ? This is one reasons I think this is wrong. --Jesper
