Commit 8ed47e14 authored Feb 05, 2020 by Maciej Fijalkowski Committed by Daniel Borkmann Feb 05, 2020

samples: bpf: Allow for -ENETDOWN in xdpsock

ndo_xsk_wakeup() can return -ENETDOWN and there's no particular reason
to bail the whole application out on that case. Let's check in kick_tx()
whether errno was set to mentioned value and basically allow application
to further process frames.

Fixes: 248c7f9c ("samples/bpf: convert xdpsock to use libbpf for AF_XDP access")
Reported-by: Cameron Elliott <cameron@cameronelliott.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/20200205045834.56795-4-maciej.fijalkowski@intel.com

parent 32c92c15

samples/bpf/xdpsock_user.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -788,7 +788,8 @@ static void kick_tx(struct xsk_socket_info *xsk)
		int ret;

		ret = sendto(xsk_socket__fd(xsk->xsk), NULL, 0, MSG_DONTWAIT, NULL, 0);
		if (ret >= 0 \|\| errno == ENOBUFS \|\| errno == EAGAIN \|\| errno == EBUSY)
		if (ret >= 0 \|\| errno == ENOBUFS \|\| errno == EAGAIN \|\|
		errno == EBUSY \|\| errno == ENETDOWN)
		return;
		exit_with_error(errno);
		}