[lustre-devel] [PATCH 28/34] lnet: add checks to ensure network interface names are unique.

[NeilBrown <neilb@suse.com>]

This is part of
    8cbb8cd3e771e7f7e0f99cafc19fad32770dc015
       LU-7734 lnet: Multi-Rail local NI split

Signed-off-by: NeilBrown <neilb@suse.com>
---
 .../staging/lustre/include/linux/lnet/lib-lnet.h   |    1 +
 drivers/staging/lustre/lnet/lnet/api-ni.c          |    8 ++++++
 drivers/staging/lustre/lnet/lnet/config.c          |   25 ++++++++++++++++++++
 3 files changed, 34 insertions(+)

diff --git a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
index 905213fc16c7..ef551b571935 100644
--- a/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
+++ b/drivers/staging/lustre/include/linux/lnet/lib-lnet.h
@@ -632,6 +632,7 @@ int lnet_parse_routes(char *route_str, int *im_a_router);
 int lnet_parse_networks(struct list_head *nilist, char *networks);
 bool lnet_net_unique(__u32 net_id, struct list_head *nilist,
 		     struct lnet_net **net);
+bool lnet_ni_unique_net(struct list_head *nilist, char *iface);
 
 int lnet_nid2peer_locked(struct lnet_peer **lpp, lnet_nid_t nid, int cpt);
 struct lnet_peer *lnet_find_peer_locked(struct lnet_peer_table *ptable,
diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c
index 042ab0d9e318..3f6f5ead8a03 100644
--- a/drivers/staging/lustre/lnet/lnet/api-ni.c
+++ b/drivers/staging/lustre/lnet/lnet/api-ni.c
@@ -1433,6 +1433,14 @@ lnet_startup_lndnet(struct lnet_net *net, struct lnet_lnd_tunables *tun)
 				ni_netlist);
 		list_del_init(&ni->ni_netlist);
 
+		/* make sure that the the NI we're about to start
+		 * up is actually unique. if it's not fail. */
+		if (!lnet_ni_unique_net(&net_l->net_ni_list,
+					ni->ni_interfaces[0])) {
+			rc = -EINVAL;
+			goto failed1;
+		}
+
 		/* adjust the pointer the parent network, just in case it
 		 * the net is a duplicate */
 		ni->ni_net = net_l;
diff --git a/drivers/staging/lustre/lnet/lnet/config.c b/drivers/staging/lustre/lnet/lnet/config.c
index fcae50676422..11d6dbc80507 100644
--- a/drivers/staging/lustre/lnet/lnet/config.c
+++ b/drivers/staging/lustre/lnet/lnet/config.c
@@ -95,6 +95,25 @@ lnet_net_unique(__u32 net_id, struct list_head *netlist,
 	return true;
 }
 
+/* check that the NI is unique within the list of NIs already added to
+ * a network */
+bool
+lnet_ni_unique_net(struct list_head *nilist, char *iface)
+{
+	struct list_head *tmp;
+	struct lnet_ni *ni;
+
+	list_for_each(tmp, nilist) {
+		ni = list_entry(tmp, struct lnet_ni, ni_netlist);
+
+		if (ni->ni_interfaces[0] != NULL &&
+		    strncmp(ni->ni_interfaces[0], iface, strlen(iface)) == 0)
+			return false;
+	}
+
+	return true;
+}
+
 static bool
 in_array(__u32 *array, __u32 size, __u32 value)
 {
@@ -352,6 +371,12 @@ lnet_ni_alloc(struct lnet_net *net, struct cfs_expr_list *el, char *iface)
 	int			rc;
 	int			i;
 
+	if (iface != NULL)
+		/* make sure that this NI is unique in the net it's
+		 * being added to */
+		if (!lnet_ni_unique_net(&net->net_ni_added, iface))
+			return NULL;
+
 	ni = kzalloc(sizeof(*ni), GFP_KERNEL);
 	if (ni == NULL) {
 		CERROR("Out of memory creating network interface %s%s\n",