diff options
| author |   Ursula Braun <ubraun@linux.vnet.ibm.com> | 2017-10-25 11:01:45 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-10-26 18:00:29 +0900 |
| commit | 60e2a7780793bae0debc275a9ccd57f7da0cf195 (patch) | |
| tree | 8b65c6c4eb3194718df692952e1b5d547c53de2f /net/ipv4/tcp.c | |
| parent | smc: fix mutex unlocks during link group creation (diff) | |
| download | linux-dev-60e2a7780793bae0debc275a9ccd57f7da0cf195.tar.xz linux-dev-60e2a7780793bae0debc275a9ccd57f7da0cf195.zip | |
tcp: TCP experimental option for SMC
The SMC protocol [1] relies on the use of a new TCP experimental
option [2, 3]. With this option, SMC capabilities are exchanged
between peers during the TCP three way handshake. This patch adds
support for this experimental option to TCP.
References:
[1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609
[2] Shared Use of TCP Experimental Options RFC 6994:
https://tools.ietf.org/rfc/rfc6994.txt
[3] IANA ExID SMCR:
http://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-exids
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
| -rw-r--r-- | net/ipv4/tcp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 8f36277e82e9..f6e1c00e300e 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -270,6 +270,7 @@ #include <linux/time.h> #include <linux/slab.h> #include <linux/errqueue.h> +#include <linux/static_key.h> #include <net/icmp.h> #include <net/inet_common.h> @@ -302,6 +303,11 @@ EXPORT_SYMBOL(sysctl_tcp_wmem); atomic_long_t tcp_memory_allocated; /* Current allocated memory. */ EXPORT_SYMBOL(tcp_memory_allocated); +#if IS_ENABLED(CONFIG_SMC) +DEFINE_STATIC_KEY_FALSE(tcp_have_smc); +EXPORT_SYMBOL(tcp_have_smc); +#endif + /* * Current number of TCP sockets. */ |