tuntap: correctly add the missing XDP flush
authorJason Wang <jasowang@redhat.com>
Sat, 24 Feb 2018 03:32:26 +0000 (11:32 +0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 26 Feb 2018 18:49:49 +0000 (13:49 -0500)
commit1bb4f2e868a2891ab8bc668b8173d6ccb8c4ce6f
tree8962cd92d2fc5c8c323fa5d0fccdf18c1638e26b
parent23e43f07f896f8578318cfcc9466f1e8b8ab21b6
tuntap: correctly add the missing XDP flush

We don't flush batched XDP packets through xdp_do_flush_map(), this
will cause packets stall at TX queue. Consider we don't do XDP on NAPI
poll(), the only possible fix is to call xdp_do_flush_map()
immediately after xdp_do_redirect().

Note, this in fact won't try to batch packets through devmap, we could
address in the future.

Reported-by: Christoffer Dall <christoffer.dall@linaro.org>
Fixes: 761876c857cb ("tap: XDP support")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/tun.c