netdev - [PATCH AUTOSEL 5.4 264/266] xdp: Fix xsk_generic

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Date:   Wed, 17 Jun 2020 21:16:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Li RongQing <lirongqing@...du.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 264/266] xdp: Fix xsk_generic_xmit errno

From: Li RongQing <lirongqing@...du.com>

[ Upstream commit aa2cad0600ed2ca6a0ab39948d4db1666b6c962b ]

Propagate sock_alloc_send_skb error code, not set it to
EAGAIN unconditionally, when fail to allocate skb, which
might cause that user space unnecessary loops.

Fixes: 35fcde7f8deb ("xsk: support for Tx")
Signed-off-by: Li RongQing <lirongqing@...du.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Björn Töpel <bjorn.topel@...el.com>
Link: https://lore.kernel.org/bpf/1591852266-24017-1-git-send-email-lirongqing@baidu.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/xdp/xsk.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 7181a30666b4..f9eb5efb237c 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -362,10 +362,8 @@ static int xsk_generic_xmit(struct sock *sk)
 
 		len = desc.len;
 		skb = sock_alloc_send_skb(sk, len, 1, &err);
-		if (unlikely(!skb)) {
-			err = -EAGAIN;
+		if (unlikely(!skb))
 			goto out;
-		}
 
 		skb_put(skb, len);
 		addr = desc.addr;
-- 
2.25.1