From: Karsten Graul <kgraul@linux.ibm.com>
Date: Wed, 29 Apr 2020 17:10:42 +0200
Subject: net/smc: multi-link support for smc_rmb_rtoken_handling()
Git-commit: e07d31dc16b0d77ff6b3f71cafe3a825fb80bed4
Patch-mainline: v5.8-rc1
References: jsc#SLE-13763

Extend smc_rmb_rtoken_handling() and smc_rtoken_delete() to support
multiple links.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 net/smc/af_smc.c   |    4 ++--
 net/smc/smc_core.c |   14 ++++++++------
 net/smc/smc_core.h |    2 +-
 3 files changed, 11 insertions(+), 9 deletions(-)

--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -640,7 +640,7 @@ static int smc_connect_rdma(struct smc_s
 	if (ini->cln_first_contact == SMC_FIRST_CONTACT)
 		smc_link_save_peer_info(link, aclc);
 
-	if (smc_rmb_rtoken_handling(&smc->conn, aclc))
+	if (smc_rmb_rtoken_handling(&smc->conn, link, aclc))
 		return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
 					 ini->cln_first_contact);
 
@@ -1231,7 +1231,7 @@ static int smc_listen_rdma_finish(struct
 	if (local_contact == SMC_FIRST_CONTACT)
 		smc_link_save_peer_info(link, cclc);
 
-	if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
+	if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) {
 		reason_code = SMC_CLC_DECL_ERR_RTOK;
 		goto decline;
 	}
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1392,19 +1392,20 @@ int smc_rtoken_add(struct smc_link *lnk,
 	return i;
 }
 
-/* delete an rtoken */
+/* delete an rtoken from all links */
 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
 {
 	struct smc_link_group *lgr = smc_get_lgr(lnk);
 	u32 rkey = ntohl(nw_rkey);
-	int i;
+	int i, j;
 
 	for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
 		if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
 		    test_bit(i, lgr->rtokens_used_mask)) {
-			lgr->rtokens[i][lnk->link_idx].rkey = 0;
-			lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
-
+			for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
+				lgr->rtokens[i][j].rkey = 0;
+				lgr->rtokens[i][j].dma_addr = 0;
+			}
 			clear_bit(i, lgr->rtokens_used_mask);
 			return 0;
 		}
@@ -1414,9 +1415,10 @@ int smc_rtoken_delete(struct smc_link *l
 
 /* save rkey and dma_addr received from peer during clc handshake */
 int smc_rmb_rtoken_handling(struct smc_connection *conn,
+			    struct smc_link *lnk,
 			    struct smc_clc_msg_accept_confirm *clc)
 {
-	conn->rtoken_idx = smc_rtoken_add(conn->lnk, clc->rmb_dma_addr,
+	conn->rtoken_idx = smc_rtoken_add(lnk, clc->rmb_dma_addr,
 					  clc->rmb_rkey);
 	if (conn->rtoken_idx < 0)
 		return conn->rtoken_idx;
--- a/net/smc/smc_core.h
+++ b/net/smc/smc_core.h
@@ -309,7 +309,7 @@ void smc_smcd_terminate_all(struct smcd_
 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev);
 int smc_buf_create(struct smc_sock *smc, bool is_smcd);
 int smc_uncompress_bufsize(u8 compressed);
-int smc_rmb_rtoken_handling(struct smc_connection *conn,
+int smc_rmb_rtoken_handling(struct smc_connection *conn, struct smc_link *link,
 			    struct smc_clc_msg_accept_confirm *clc);
 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey);
 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey);