From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: terminate link group if out-of-sync is received
Patch-mainline: v4.14-rc2
Git-commit: bfbedfd38378c1ad9df84469403d69c17b074b66
References: FATE#325694, LTC#167874, bsc#1113480

Summary:     net/smc: SMC-R MVP
Description: Add latest upstream patches to push SMC-R to the MVP level

Upstream-Description:

             net/smc: terminate link group if out-of-sync is received

             An out-of-sync condition can just be detected by the client.
             If the server receives a CLC DECLINE message indicating an out-of-sync
             condition for the link groups, the server must clean up the out-of-sync
             link group.
             There is no need for an extra third parameter in smc_clc_send_decline().

             Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
             Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/af_smc.c  |    6 ++----
 net/smc/smc_clc.c |   10 +++++-----
 net/smc/smc_clc.h |    3 +--
 3 files changed, 8 insertions(+), 11 deletions(-)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -513,7 +513,7 @@ decline_rdma:
 	/* RDMA setup failed, switch back to TCP */
 	smc->use_fallback = true;
 	if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
-		rc = smc_clc_send_decline(smc, reason_code, 0);
+		rc = smc_clc_send_decline(smc, reason_code);
 		if (rc < sizeof(struct smc_clc_msg_decline))
 			goto out_err;
 	}
@@ -808,8 +808,6 @@ static void smc_listen_work(struct work_
 		rc = local_contact;
 		if (rc == -ENOMEM)
 			reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
-		else if (rc == -ENOLINK)
-			reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
 		goto decline_rdma;
 	}
 	link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
@@ -903,7 +901,7 @@ decline_rdma:
 	smc_conn_free(&new_smc->conn);
 	new_smc->use_fallback = true;
 	if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
-		rc = smc_clc_send_decline(new_smc, reason_code, 0);
+		rc = smc_clc_send_decline(new_smc, reason_code);
 		if (rc < sizeof(struct smc_clc_msg_decline))
 			goto out_err;
 	}
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -95,9 +95,10 @@ int smc_clc_wait_msg(struct smc_sock *sm
 	}
 	if (clcm->type == SMC_CLC_DECLINE) {
 		reason_code = SMC_CLC_DECL_REPLY;
-		if (ntohl(((struct smc_clc_msg_decline *)buf)->peer_diagnosis)
-			== SMC_CLC_DECL_SYNCERR)
+		if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
 			smc->conn.lgr->sync_err = true;
+			smc_lgr_terminate(smc->conn.lgr);
+		}
 	}
 
 out:
@@ -105,8 +106,7 @@ out:
 }
 
 /* send CLC DECLINE message across internal TCP socket */
-int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
-			 u8 out_of_sync)
+int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info)
 {
 	struct smc_clc_msg_decline dclc;
 	struct msghdr msg;
@@ -118,7 +118,7 @@ int smc_clc_send_decline(struct smc_sock
 	dclc.hdr.type = SMC_CLC_DECLINE;
 	dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline));
 	dclc.hdr.version = SMC_CLC_V1;
-	dclc.hdr.flag = out_of_sync ? 1 : 0;
+	dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0;
 	memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid));
 	dclc.peer_diagnosis = htonl(peer_diag_info);
 	memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER));
--- a/net/smc/smc_clc.h
+++ b/net/smc/smc_clc.h
@@ -106,8 +106,7 @@ struct smc_ib_device;
 
 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 		     u8 expected_type);
-int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info,
-			 u8 out_of_sync);
+int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info);
 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_ib_device *smcibdev,
 			  u8 ibport);
 int smc_clc_send_confirm(struct smc_sock *smc);