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xsk: proper Rx drop statistics update 

Previously, rx_dropped could be updated incorrectly, e.g. if the XDP
program redirected the frame to a socket bound to a different queue
than where the XDP program was executing.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2018-06-04 13:57:12 +02:00 committed by Daniel Borkmann
parent 4e64c83525
commit a509a95536
1 changed files with 5 additions and 5 deletions
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10
net/xdp/xsk.c
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@ -48,8 +48,10 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index)
return -EINVAL;
if (!xskq_peek_id(xs->umem->fq, &id))
if (!xskq_peek_id(xs->umem->fq, &id)) {
xs->rx_dropped++;
return -ENOSPC;
}
buffer = xdp_umem_get_data_with_headroom(xs->umem, id);
memcpy(buffer, xdp->data, len);
@ -57,6 +59,8 @@ static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
xs->umem->frame_headroom);
if (!err)
xskq_discard_id(xs->umem->fq);
else
xs->rx_dropped++;
return err;
}
@ -68,8 +72,6 @@ int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
err = __xsk_rcv(xs, xdp);
if (likely(!err))
xdp_return_buff(xdp);
else
xs->rx_dropped++;
return err;
}
@ -87,8 +89,6 @@ int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
err = __xsk_rcv(xs, xdp);
if (!err)
xsk_flush(xs);
else
xs->rx_dropped++;
return err;
}