If connection initialization fails for the LLC CONFIRM LINK or the
LLC ADD LINK step, fallback to TCP should be enabled. Thus
the negative return code -EAGAIN should switch to a positive timeout
reason code in these cases, and the internal CLC socket should
not have a set sk_err.
Signed-off-by: Ursula Braun <ubraun@xxxxxxxxxxxxx>
---
net/smc/af_smc.c | 8 ++++----
net/smc/smc_clc.c | 9 +++++++--
2 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index d9b1a0e4446c..66836cfbc587 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -336,7 +336,7 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE);
- return rc;
+ return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
}
if (link->llc_confirm_rc)
@@ -364,7 +364,7 @@ static int smc_clnt_conf_first_link(struct smc_sock *smc)
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE);
- return rc;
+ return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
}
/* send add link reject message, only one link supported for now */
@@ -966,7 +966,7 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE);
- return rc;
+ return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
}
if (link->llc_confirm_resp_rc)
@@ -987,7 +987,7 @@ static int smc_serv_conf_first_link(struct smc_sock *smc)
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE);
- return rc;
+ return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
}
smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 7278ec0cfa58..62043d69e3a3 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -297,7 +297,11 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
}
if (clc_sk->sk_err) {
reason_code = -clc_sk->sk_err;
- smc->sk.sk_err = clc_sk->sk_err;
+ if (clc_sk->sk_err == EAGAIN &&
+ expected_type == SMC_CLC_DECLINE)
+ clc_sk->sk_err = 0; /* reset for fallback usage */
+ else
+ smc->sk.sk_err = clc_sk->sk_err;
goto out;
}
if (!len) { /* peer has performed orderly shutdown */
@@ -306,7 +310,8 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
goto out;
}
if (len < 0) {
- smc->sk.sk_err = -len;
+ if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE)
+ smc->sk.sk_err = -len;
reason_code = len;
goto out;
}
--
2.16.4
