net/smc: remember PNETID of IB device for later device matching

The PNETID is needed to find an alternate link for a link group.
Save the PNETID of the link that is used to create the link group for
later device matching.

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_core.c

@@ -413,6 +413,8 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 		lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
 		memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
 		       SMC_SYSTEMID_LEN);
+		memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
+		       SMC_MAX_PNETID_LEN);
 		smc_llc_lgr_init(lgr, smc);
 
 		link_idx = SMC_SINGLE_LINK;

net/smc/smc_core.h

@@ -244,6 +244,8 @@ struct smc_link_group {
 			u8			next_link_id;
 			enum smc_lgr_type	type;
 						/* redundancy state */
+			u8			pnet_id[SMC_MAX_PNETID_LEN + 1];
+						/* pnet id of this lgr */
 			struct list_head	llc_event_q;
 						/* queue for llc events */
 			spinlock_t		llc_event_q_lock;