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| author | David S. Miller <davem@davemloft.net> | 2012-06-19 21:22:05 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-06-19 21:22:05 -0700 |
| commit | 41063e9dd11956f2d285e12e4342e1d232ba0ea2 (patch) | |
| tree | d4df2f51044b4724a4767f0498c3df2f606b5ad7 /include/net/sock.h | |
| parent | f9242b6b28d61295f2bf7e8adfb1060b382e5381 (diff) | |
| download | linux-stable-41063e9dd11956f2d285e12e4342e1d232ba0ea2.tar.gz linux-stable-41063e9dd11956f2d285e12e4342e1d232ba0ea2.tar.bz2 linux-stable-41063e9dd11956f2d285e12e4342e1d232ba0ea2.zip | |
ipv4: Early TCP socket demux.
Input packet processing for local sockets involves two major demuxes.
One for the route and one for the socket.
But we can optimize this down to one demux for certain kinds of local
sockets.
Currently we only do this for established TCP sockets, but it could
at least in theory be expanded to other kinds of connections.
If a TCP socket is established then it's identity is fully specified.
This means that whatever input route was used during the three-way
handshake must work equally well for the rest of the connection since
the keys will not change.
Once we move to established state, we cache the receive packet's input
route to use later.
Like the existing cached route in sk->sk_dst_cache used for output
packets, we have to check for route invalidations using dst->obsolete
and dst->ops->check().
Early demux occurs outside of a socket locked section, so when a route
invalidation occurs we defer the fixup of sk->sk_rx_dst until we are
actually inside of established state packet processing and thus have
the socket locked.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sock.h')
| -rw-r--r-- | include/net/sock.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/sock.h b/include/net/sock.h index 4a4521699563..87b424ae750a 100644 --- a/include/net/sock.h +++ b/include/net/sock.h @@ -319,6 +319,7 @@ struct sock { unsigned long sk_flags; struct dst_entry *sk_dst_cache; spinlock_t sk_dst_lock; + struct dst_entry *sk_rx_dst; atomic_t sk_wmem_alloc; atomic_t sk_omem_alloc; int sk_sndbuf; @@ -1426,6 +1427,7 @@ extern struct sk_buff *sock_rmalloc(struct sock *sk, gfp_t priority); extern void sock_wfree(struct sk_buff *skb); extern void sock_rfree(struct sk_buff *skb); +extern void sock_edemux(struct sk_buff *skb); extern int sock_setsockopt(struct socket *sock, int level, int op, char __user *optval, |