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authorEric Dumazet <edumazet@google.com>2015-09-29 17:42:52 +0300
committerDavid S. Miller <davem@davemloft.net>2015-09-30 02:53:10 +0300
commit0536fcc039a8926ec12ec587f41a83f7acafeb82 (patch)
tree335da15ef581d750ada2ba11e6ca6900ba82ae86 /include/net/request_sock.h
parent2985aaac010ebd5e562ce1a22cc61acbb0e40cf2 (diff)
downloadlinux-0536fcc039a8926ec12ec587f41a83f7acafeb82.tar.xz
tcp: prepare fastopen code for upcoming listener changes
While auditing TCP stack for upcoming 'lockless' listener changes, I found I had to change fastopen_init_queue() to properly init the object before publishing it. Otherwise an other cpu could try to lock the spinlock before it gets properly initialized. Instead of adding appropriate barriers, just remove dynamic memory allocations : - Structure is 28 bytes on 64bit arches. Using additional 8 bytes for holding a pointer seems overkill. - Two listeners can share same cache line and performance would suffer. If we really want to save few bytes, we would instead dynamically allocate whole struct request_sock_queue in the future. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/request_sock.h')
-rw-r--r--include/net/request_sock.h7
1 files changed, 2 insertions, 5 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index c146b5284786..d2544de329bd 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -180,11 +180,8 @@ struct request_sock_queue {
struct request_sock *rskq_accept_tail;
u8 rskq_defer_accept;
struct listen_sock *listen_opt;
- struct fastopen_queue *fastopenq; /* This is non-NULL iff TFO has been
- * enabled on this listener. Check
- * max_qlen != 0 in fastopen_queue
- * to determine if TFO is enabled
- * right at this moment.
+ struct fastopen_queue fastopenq; /* Check max_qlen != 0 to determine
+ * if TFO is enabled.
*/
/* temporary alignment, our goal is to get rid of this lock */