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xdp: Fix xsk_generic_xmit errno

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[ 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: 35fcde7f8d ("xsk: support for Tx")
Signed-off-by: Li RongQing <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Li RongQing 2020-06-11 13:11:06 +08:00 • committed by Greg Kroah-Hartman
commit e7847db7aa
1 changed files with 1 additions and 3 deletions
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4
net/xdp/xsk.c
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@ -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;