diff options
| -rw-r--r-- | net/smc/af_smc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 70f7640f5090..6451c5013e06 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -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); |