On Mon, Feb 05, 2018 at 02:34:33PM +1100, Daniel Axtens wrote:
> tbf_enqueue() checks the size of a packet before enqueuing it.
> However, the GSO size check does not consider the GSO_BY_FRAGS
> case, and so will drop GSO SCTP packets, causing a massive drop
> in throughput.
>
> Use skb_gso_validate_mac_len() instead, as it does consider that
> case.
>
> ---
>
> skb_gso_validate_mac_len() is an out-of-line call, but so is
> skb_gso_mac_seglen(), so this is slower but not much slower. I
> will send a patch to make the skb_gso_validate_* functions
> inline-able shortly.
>
> Also, GSO_BY_FRAGS considered harmful - I'm pretty sure this is
> not the only place it causes issues.
Thanks for spotting these issues and fixing them.
>
> Signed-off-by: Daniel Axtens <d...@axtens.net>
If this block was meant to be an out-of-band/changelog comment, your
SOB line should be above the first --- marker.
Anyhow,
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
> ---
> net/sched/sch_tbf.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
> index 229172d509cc..03225a8df973 100644
> --- a/net/sched/sch_tbf.c
> +++ b/net/sched/sch_tbf.c
> @@ -188,7 +188,8 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc
> *sch,
> int ret;
>
> if (qdisc_pkt_len(skb) > q->max_size) {
> - if (skb_is_gso(skb) && skb_gso_mac_seglen(skb) <= q->max_size)
> + if (skb_is_gso(skb) &&
> + skb_gso_validate_mac_len(skb, q->max_size))
> return tbf_segment(skb, sch, to_free);
> return qdisc_drop(skb, sch, to_free);
> }
> --
> 2.14.1
>
