[bpf,4/4] xsk: do not return EMSGSIZE in copy mode for packets larger than MTU

Message ID 1531296772-28850-5-git-send-email-magnus.karlsson@intel.com
State Accepted
Delegated to: BPF Maintainers
Headers show
  • Consistent sendmsg error reporting in AF_XDP
Related show

Commit Message

Magnus Karlsson July 11, 2018, 8:12 a.m.
This patch stops returning EMSGSIZE from sendmsg in copy mode when the
size of the packet is larger than the MTU. Just send it to the device
so that it will drop it as in zero-copy mode. This makes the error
reporting consistent between copy mode and zero-copy mode.

Fixes: 35fcde7f8deb ("xsk: support for Tx")
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
 net/xdp/xsk.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)


diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 9c784307f7b0..72335c2e8108 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -233,15 +233,10 @@  static int xsk_generic_xmit(struct sock *sk, struct msghdr *m,
 		if (xskq_reserve_addr(xs->umem->cq))
 			goto out;
-		len = desc.len;
-		if (unlikely(len > xs->dev->mtu)) {
-			err = -EMSGSIZE;
-			goto out;
-		}
 		if (xs->queue_id >= xs->dev->real_num_tx_queues)
 			goto out;
+		len = desc.len;
 		skb = sock_alloc_send_skb(sk, len, 1, &err);
 		if (unlikely(!skb)) {
 			err = -EAGAIN;