net/smc: Introduce net namespace support for linkgroup

Currently, rdma device supports exclusive net namespace isolation,
however linkgroup doesn't know and support ibdev net namespace.
Applications in the containers don't want to share the nics if we
enabled rdma exclusive mode. Every net namespaces should have their own
linkgroups.

This patch introduce a new field net for linkgroup, which is standing
for the ibdev net namespace in the linkgroup. The net in linkgroup is
initialized with the net namespace of link's ibdev. It compares the net
of linkgroup and sock or ibdev before choose it, if no matched, create
new one in current net namespace. If rdma net namespace exclusive mode
is not enabled, it behaves as before.

Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 7 deletions

diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 20d1417f0a68..b53cdecf621d 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -897,6 +897,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 			smc_wr_free_lgr_mem(lgr);
 			goto free_wq;
 		}
+		lgr->net = smc_ib_net(lnk->smcibdev);
 		lgr_list = &smc_lgr_list.list;
 		lgr_lock = &smc_lgr_list.lock;
 		atomic_inc(&lgr_cnt);
@@ -1585,7 +1586,8 @@ void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
 		if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
 			    SMC_MAX_PNETID_LEN) ||
 		    lgr->type == SMC_LGR_SYMMETRIC ||
-		    lgr->type == SMC_LGR_ASYMMETRIC_PEER)
+		    lgr->type == SMC_LGR_ASYMMETRIC_PEER ||
+		    !rdma_dev_access_netns(smcibdev->ibdev, lgr->net))
 			continue;
 
 		/* trigger local add link processing */
@@ -1743,8 +1745,10 @@ static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version,
 			   u8 peer_systemid[],
 			   u8 peer_gid[],
 			   u8 peer_mac_v1[],
-			   enum smc_lgr_role role, u32 clcqpn)
+			   enum smc_lgr_role role, u32 clcqpn,
+			   struct net *net)
 {
+	struct smc_link *lnk;
 	int i;
 
 	if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) ||
@@ -1752,12 +1756,17 @@ static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version,
 		return false;
 
 	for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
-		if (!smc_link_active(&lgr->lnk[i]))
+		lnk = &lgr->lnk[i];
+
+		if (!smc_link_active(lnk))
 			continue;
-		if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
-		    !memcmp(lgr->lnk[i].peer_gid, peer_gid, SMC_GID_SIZE) &&
+		/* use verbs API to check netns, instead of lgr->net */
+		if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net))
+			return false;
+		if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) &&
+		    !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) &&
 		    (smcr_version == SMC_V2 ||
-		     !memcmp(lgr->lnk[i].peer_mac, peer_mac_v1, ETH_ALEN)))
+		     !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN)))
 			return true;
 	}
 	return false;
@@ -1773,6 +1782,7 @@ static bool smcd_lgr_match(struct smc_link_group *lgr,
 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 {
 	struct smc_connection *conn = &smc->conn;
+	struct net *net = sock_net(&smc->sk);
 	struct list_head *lgr_list;
 	struct smc_link_group *lgr;
 	enum smc_lgr_role role;
@@ -1799,7 +1809,7 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 		     smcr_lgr_match(lgr, ini->smcr_version,
 				    ini->peer_systemid,
 				    ini->peer_gid, ini->peer_mac, role,
-				    ini->ib_clcqpn)) &&
+				    ini->ib_clcqpn, net)) &&
 		    !lgr->sync_err &&
 		    (ini->smcd_version == SMC_V2 ||
 		     lgr->vlan_id == ini->vlan_id) &&