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authorEric Dumazet <edumazet@google.com>2020-04-17 07:10:23 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-04-29 16:31:21 +0200
commit3405bf51f6d861dd127e72df048a6e0d1581f7a8 (patch)
tree04c95985a93c3c978d71a8a015df2b8d7b67bbe7 /include/net
parent1ee7ced6468349f12a7094ac93f8e66c43064248 (diff)
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tcp: cache line align MAX_TCP_HEADER
[ Upstream commit 9bacd256f1354883d3c1402655153367982bba49 ] TCP stack is dumb in how it cooks its output packets. Depending on MAX_HEADER value, we might chose a bad ending point for the headers. If we align the end of TCP headers to cache line boundary, we make sure to always use the smallest number of cache lines, which always help. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 918bfd0d7d1f..e43df898d3db 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -53,7 +53,7 @@ extern struct inet_hashinfo tcp_hashinfo;
extern struct percpu_counter tcp_orphan_count;
void tcp_time_wait(struct sock *sk, int state, int timeo);
-#define MAX_TCP_HEADER (128 + MAX_HEADER)
+#define MAX_TCP_HEADER L1_CACHE_ALIGN(128 + MAX_HEADER)
#define MAX_TCP_OPTION_SPACE 40
#define TCP_MIN_SND_MSS 48
#define TCP_MIN_GSO_SIZE (TCP_MIN_SND_MSS - MAX_TCP_OPTION_SPACE)