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authorEric Dumazet2022-01-31 22:52:54 -0800
committerJakub Kicinski2022-02-01 20:21:40 -0800
commit479f5547239d970d3833f15f54a6481fffdb91ec (patch)
tree524d5d9fedeea8d2594e0b7bdb9f524da541143a /drivers
parente42e70ad6ae2ae511a6143d2e8da929366e58bd9 (diff)
tcp: fix mem under-charging with zerocopy sendmsg()
We got reports of following warning in inet_sock_destruct() WARN_ON(sk_forward_alloc_get(sk)); Whenever we add a non zero-copy fragment to a pure zerocopy skb, we have to anticipate that whole skb->truesize will be uncharged when skb is finally freed. skb->data_len is the payload length. But the memory truesize estimated by __zerocopy_sg_from_iter() is page aligned. Fixes: 9b65b17db723 ("net: avoid double accounting for pure zerocopy skbs") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Talal Ahmad <talalahmad@google.com> Cc: Arjun Roy <arjunroy@google.com> Cc: Willem de Bruijn <willemb@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Link: https://lore.kernel.org/r/20220201065254.680532-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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