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authorEric Dumazet <edumazet@google.com>2017-02-02 20:40:08 -0800
committerDavid S. Miller <davem@davemloft.net>2017-02-03 16:23:57 -0500
commit38ab52e8e1e2dd65f2d349f82553335813b638d2 (patch)
tree659bcbc397163954d2845ef6f438996da8ee1412 /include/net/netns
parent5226b7919641f285bf0f8db84deeb3920b160ec7 (diff)
tcp: clear pfmemalloc on outgoing skb
Josef Bacik diagnosed following problem : I was seeing random disconnects while testing NBD over loopback. This turned out to be because NBD sets pfmemalloc on it's socket, however the receiving side is a user space application so does not have pfmemalloc set on its socket. This means that sk_filter_trim_cap will simply drop this packet, under the assumption that the other side will simply retransmit. Well we do retransmit, and then the packet is just dropped again for the same reason. It seems the better way to address this problem is to clear pfmemalloc in the TCP transmit path. pfmemalloc strict control really makes sense on the receive path. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Josef Bacik <jbacik@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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