netdev - [PATCH bpf 3/4] samples/bpf: deal with EBUSY return code from sendmsg in xdpsock sample

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Message-Id: <1530108136-4984-4-git-send-email-magnus.karlsson@intel.com>
Date:   Wed, 27 Jun 2018 16:02:15 +0200
From:   Magnus Karlsson <magnus.karlsson@...el.com>
To:     magnus.karlsson@...el.com, bjorn.topel@...el.com, ast@...com,
        daniel@...earbox.net, netdev@...r.kernel.org
Cc:     qi.z.zhang@...el.com, pavel@...tnetmon.com
Subject: [PATCH bpf 3/4] samples/bpf: deal with EBUSY return code from sendmsg in xdpsock sample

Sendmsg in the SKB path of AF_XDP can now return EBUSY when a packet
was discarded and completed by the driver. Just ignore this message
in the sample application.

Fixes: b4b8faa1ded7 ("samples/bpf: sample application and documentation for AF_XDP sockets")
Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
Reported-by: Pavel Odintsov <pavel@...tnetmon.com>
---
 samples/bpf/xdpsock_user.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index d69c8d78d3fd..aec3a61fac44 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -729,7 +729,7 @@ static void kick_tx(int fd)
 	int ret;
 
 	ret = sendto(fd, NULL, 0, MSG_DONTWAIT, NULL, 0);
-	if (ret >= 0 || errno == ENOBUFS || errno == EAGAIN)
+	if (ret >= 0 || errno == EAGAIN || errno == EBUSY)
 		return;
 	lassert(0);
 }
-- 
2.7.4