@@ -390,6 +390,12 @@ static int smc_connect_rdma(struct smc_sock *smc)
int rc = 0;
u8 ibport;
+ if (!tcp_sk(smc->clcsock->sk)->syn_smc) {
+ /* peer has not signalled SMC-capability */
+ smc->use_fallback = true;
+ goto out_connected;
+ }
+
/* IPSec connections opt out of SMC-R optimizations */
if (using_ipsec(smc)) {
reason_code = SMC_CLC_DECL_IPSEC;
@@ -555,6 +561,7 @@ static int smc_connect(struct socket *sock, struct sockaddr *addr,
}
smc_copy_sock_settings_to_clc(smc);
+ tcp_sk(smc->clcsock->sk)->syn_smc = 1;
rc = kernel_connect(smc->clcsock, addr, alen, flags);
if (rc)
goto out;
@@ -759,6 +766,12 @@ static void smc_listen_work(struct work_struct *work)
u8 prefix_len;
u8 ibport;
+ /* check if peer is smc capable */
+ if (!tcp_sk(newclcsock->sk)->syn_smc) {
+ new_smc->use_fallback = true;
+ goto out_connected;
+ }
+
/* do inband token exchange -
*wait for and receive SMC Proposal CLC message
*/
@@ -967,6 +980,7 @@ static int smc_listen(struct socket *sock, int backlog)
* them to the clc socket -- copy smc socket options to clc socket
*/
smc_copy_sock_settings_to_clc(smc);
+ tcp_sk(smc->clcsock->sk)->syn_smc = 1;
rc = kernel_listen(smc->clcsock, backlog);
if (rc)
@@ -1409,6 +1423,7 @@ static int __init smc_init(void)
goto out_sock;
}
+ static_branch_enable(&tcp_have_smc);
return 0;
out_sock:
@@ -1433,6 +1448,7 @@ static void __exit smc_exit(void)
list_del_init(&lgr->list);
smc_lgr_free(lgr); /* free link group */
}
+ static_branch_disable(&tcp_have_smc);
smc_ib_unregister_client();
sock_unregister(PF_SMC);
proto_unregister(&smc_proto);
The SMC protocol [1] uses a rendezvous protocol to negotiate SMC capability between peers. The current Linux implementation does not yet use this rendezvous protocol and, thus, is not compliant to RFC7609 and incompatible with other SMC implementations like in zOS. This patch adds support for the SMC rendezvous protocol. It uses a new TCP experimental option. With this option, SMC capabilities are exchanged between the peers during the TCP three way handshake. [1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609 Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> --- net/smc/af_smc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)