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xsk: Diversify return codes in xsk_rcv_check() 

Inspired by patch that made xdp_do_redirect() return values for XSKMAP
more meaningful, return -ENXIO instead of -EINVAL for socket being
unbound in xsk_rcv_check() as this is the usual value that is returned
for such event. In turn, it is now possible to easily distinguish what
went wrong, which is a bit harder when for both cases checked, -EINVAL
was returned.

Return codes can be counted in a nice way via bpftrace oneliner that
Jesper has shown:

bpftrace -e 'tracepoint:xdp:xdp_redirect* {@err[-args->err] = count();}'

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/bpf/20220413153015.453864-3-maciej.fijalkowski@intel.com
This commit is contained in:
Maciej Fijalkowski 2022-04-13 17:30:03 +02:00 committed by Daniel Borkmann
parent c6c1f11b69
commit 2be4a677cc
1 changed files with 1 additions and 1 deletions
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2
net/xdp/xsk.c
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@ -217,7 +217,7 @@ static bool xsk_is_bound(struct xdp_sock *xs)
static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp)
{
if (!xsk_is_bound(xs))
return -EINVAL;
return -ENXIO;
if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
return -EINVAL;