• Doron Roberts-Kedes's avatar
    strparser: Remove early eaten to fix full tcp receive buffer stall · 4f5f7bce
    Doron Roberts-Kedes authored
    [ Upstream commit 977c7114 ]
    On receving an incomplete message, the existing code stores the
    remaining length of the cloned skb in the early_eaten field instead of
    incrementing the value returned by __strp_recv. This defers invocation
    of sock_rfree for the current skb until the next invocation of
    __strp_recv, which returns early_eaten if early_eaten is non-zero.
    This behavior causes a stall when the current message occupies the very
    tail end of a massive skb, and strp_peek/need_bytes indicates that the
    remainder of the current message has yet to arrive on the socket. The
    TCP receive buffer is totally full, causing the TCP window to go to
    zero, so the remainder of the message will never arrive.
    Incrementing the value returned by __strp_recv by the amount otherwise
    stored in early_eaten prevents stalls of this nature.
    Signed-off-by: 's avatarDoron Roberts-Kedes <doronrk@fb.com>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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