net/smc: final part of add link processing as SMC server

This patch finalizes the ADD_LINK processing of new links. Send the
CONFIRM_LINK request to the peer, receive the response and set link
state to ACTIVE.
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>

net/smc/smc_llc.c

@@ -904,6 +904,33 @@ static int smc_llc_srv_rkey_exchange(struct smc_link *link,
 	return rc;
 }
 
+static int smc_llc_srv_conf_link(struct smc_link *link,
+				 struct smc_link *link_new,
+				 enum smc_lgr_type lgr_new_t)
+{
+	struct smc_link_group *lgr = link->lgr;
+	struct smc_llc_qentry *qentry = NULL;
+	int rc;
+
+	/* send CONFIRM LINK request over the RoCE fabric */
+	rc = smc_llc_send_confirm_link(link_new, SMC_LLC_REQ);
+	if (rc)
+		return -ENOLINK;
+	/* receive CONFIRM LINK response over the RoCE fabric */
+	qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_FIRST_TIME,
+			      SMC_LLC_CONFIRM_LINK);
+	if (!qentry) {
+		/* send DELETE LINK */
+		smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
+					 false, SMC_LLC_DEL_LOST_PATH);
+		return -ENOLINK;
+	}
+	smc_llc_link_active(link_new);
+	lgr->type = lgr_new_t;
+	smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
+	return 0;
+}
+
 int smc_llc_srv_add_link(struct smc_link *link)
 {
 	enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
@@ -967,7 +994,7 @@ int smc_llc_srv_add_link(struct smc_link *link)
 	rc = smc_llc_srv_rkey_exchange(link, link_new);
 	if (rc)
 		goto out_err;
-	/* tbd: rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t); */
+	rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t);
 	if (rc)
 		goto out_err;
 	return 0;