net/smc: Add netlink net namespace support

This adds net namespace ID to diag of linkgroup, helps us to distinguish
different namespaces, and net_cookie is unique in the whole system.
Signed-off-by: Tony Lu <tonylu@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/smc.h

@@ -119,6 +119,8 @@ enum {
 	SMC_NLA_LGR_R_CONNS_NUM,	/* u32 */
 	SMC_NLA_LGR_R_V2_COMMON,	/* nest */
 	SMC_NLA_LGR_R_V2,		/* nest */
+	SMC_NLA_LGR_R_NET_COOKIE,	/* u64 */
+	SMC_NLA_LGR_R_PAD,		/* flag */
 	__SMC_NLA_LGR_R_MAX,
 	SMC_NLA_LGR_R_MAX = __SMC_NLA_LGR_R_MAX - 1
 };

include/uapi/linux/smc_diag.h

@@ -84,11 +84,12 @@ struct smc_diag_conninfo {
 /* SMC_DIAG_LINKINFO */
 
 struct smc_diag_linkinfo {
-	__u8 link_id;			/* link identifier */
-	__u8 ibname[IB_DEVICE_NAME_MAX]; /* name of the RDMA device */
-	__u8 ibport;			/* RDMA device port number */
-	__u8 gid[40];			/* local GID */
-	__u8 peer_gid[40];		/* peer GID */
+	__u8		link_id;		    /* link identifier */
+	__u8		ibname[IB_DEVICE_NAME_MAX]; /* name of the RDMA device */
+	__u8		ibport;			    /* RDMA device port number */
+	__u8		gid[40];		    /* local GID */
+	__u8		peer_gid[40];		    /* peer GID */
+	__aligned_u64	net_cookie;                 /* RDMA device net namespace */
 };
 
 struct smc_diag_lgrinfo {

net/smc/smc_core.c

@@ -348,6 +348,9 @@ static int smc_nl_fill_lgr(struct smc_link_group *lgr,
 		goto errattr;
 	if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
 		goto errattr;
+	if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE,
+			      lgr->net->net_cookie, SMC_NLA_LGR_R_PAD))
+		goto errattr;
 	memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
 	smc_target[SMC_MAX_PNETID_LEN] = 0;
 	if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))

net/smc/smc_diag.c

@@ -145,19 +145,21 @@ static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
 	if (smc->conn.lgr && !smc->conn.lgr->is_smcd &&
 	    (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
 	    !list_empty(&smc->conn.lgr->list)) {
+		struct smc_link *link = smc->conn.lnk;
+		struct net *net = read_pnet(&link->smcibdev->ibdev->coredev.rdma_net);
+
 		struct smc_diag_lgrinfo linfo = {
 			.role = smc->conn.lgr->role,
-			.lnk[0].ibport = smc->conn.lnk->ibport,
-			.lnk[0].link_id = smc->conn.lnk->link_id,
+			.lnk[0].ibport = link->ibport,
+			.lnk[0].link_id = link->link_id,
+			.lnk[0].net_cookie = net->net_cookie,
 		};
 
 		memcpy(linfo.lnk[0].ibname,
 		       smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
-		       sizeof(smc->conn.lnk->smcibdev->ibdev->name));
-		smc_gid_be16_convert(linfo.lnk[0].gid,
-				     smc->conn.lnk->gid);
-		smc_gid_be16_convert(linfo.lnk[0].peer_gid,
-				     smc->conn.lnk->peer_gid);
+		       sizeof(link->smcibdev->ibdev->name));
+		smc_gid_be16_convert(linfo.lnk[0].gid, link->gid);
+		smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid);
 
 		if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 			goto errout;