tuntap: correctly add the missing XDP flush

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[ Upstream commit 1bb4f2e868 ]

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: 761876c857 ("tap: XDP support")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jason Wang 2018-02-24 11:32:26 +08:00 • committed by Greg Kroah-Hartman

parent abb4a8b870

commit 1903344b63

1 changed files with 1 additions and 0 deletions

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drivers/net/tun.c

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