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path: root/net/smc/af_smc.c
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Diffstat (limited to 'net/smc/af_smc.c')
-rw-r--r--net/smc/af_smc.c42
1 files changed, 31 insertions, 11 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 745f145d4c4d..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
*/
@@ -808,7 +821,7 @@ static void smc_listen_work(struct work_struct *work)
rc = local_contact;
if (rc == -ENOMEM)
reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
@@ -816,7 +829,7 @@ static void smc_listen_work(struct work_struct *work)
rc = smc_buf_create(new_smc);
if (rc) {
reason_code = SMC_CLC_DECL_MEM;
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
smc_close_init(new_smc);
@@ -831,7 +844,7 @@ static void smc_listen_work(struct work_struct *work)
buf_desc->mr_rx[SMC_SINGLE_LINK]);
if (rc) {
reason_code = SMC_CLC_DECL_INTERR;
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
}
}
@@ -839,15 +852,15 @@ static void smc_listen_work(struct work_struct *work)
rc = smc_clc_send_accept(new_smc, local_contact);
if (rc)
- goto out_err;
+ goto out_err_unlock;
/* receive SMC Confirm CLC message */
reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
SMC_CLC_CONFIRM);
if (reason_code < 0)
- goto out_err;
+ goto out_err_unlock;
if (reason_code > 0)
- goto decline_rdma;
+ goto decline_rdma_unlock;
smc_conn_save_peer_info(new_smc, &cclc);
if (local_contact == SMC_FIRST_CONTACT)
smc_link_save_peer_info(link, &cclc);
@@ -855,34 +868,34 @@ static void smc_listen_work(struct work_struct *work)
rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
if (rc) {
reason_code = SMC_CLC_DECL_INTERR;
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
if (local_contact == SMC_FIRST_CONTACT) {
rc = smc_ib_ready_link(link);
if (rc) {
reason_code = SMC_CLC_DECL_INTERR;
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
/* QP confirmation over RoCE fabric */
reason_code = smc_serv_conf_first_link(new_smc);
if (reason_code < 0) {
/* peer is not aware of a problem */
rc = reason_code;
- goto out_err;
+ goto out_err_unlock;
}
if (reason_code > 0)
- goto decline_rdma;
+ goto decline_rdma_unlock;
}
smc_tx_init(new_smc);
+ mutex_unlock(&smc_create_lgr_pending);
out_connected:
sk_refcnt_debug_inc(newsmcsk);
if (newsmcsk->sk_state == SMC_INIT)
newsmcsk->sk_state = SMC_ACTIVE;
enqueue:
- mutex_unlock(&smc_create_lgr_pending);
lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
if (lsmc->sk.sk_state == SMC_LISTEN) {
smc_accept_enqueue(&lsmc->sk, newsmcsk);
@@ -896,6 +909,8 @@ enqueue:
sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
return;
+decline_rdma_unlock:
+ mutex_unlock(&smc_create_lgr_pending);
decline_rdma:
/* RDMA setup failed, switch back to TCP */
smc_conn_free(&new_smc->conn);
@@ -907,6 +922,8 @@ decline_rdma:
}
goto out_connected;
+out_err_unlock:
+ mutex_unlock(&smc_create_lgr_pending);
out_err:
newsmcsk->sk_state = SMC_CLOSED;
smc_conn_free(&new_smc->conn);
@@ -963,6 +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)
@@ -1405,6 +1423,7 @@ static int __init smc_init(void)
goto out_sock;
}
+ static_branch_enable(&tcp_have_smc);
return 0;
out_sock:
@@ -1429,6 +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);