i40iw: Selectively teardown QPs on IP addr change event

On IP address change event, all connected QPs are torn down
irrespective of whether IP address is involved in a connection.

Only teardown connections those source or destination address
matches the netdev interface IP address being changed, and if
they are on the same VLAN as the netdev.

Fixes: e5e74b61b165 ("i40iw: Add IP addr handling on netdev events")
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c
index 03e6fc6..0cc52e6 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c
@@ -4228,10 +4228,16 @@ set_qhash:
 }
 
 /**
- * i40iw_cm_disconnect_all - disconnect all connected qp's
+ * i40iw_cm_teardown_connections - teardown QPs
  * @iwdev: device pointer
+ * @ipaddr: Pointer to IPv4 or IPv6 address
+ * @ipv4: flag indicating IPv4 when true
+ * @disconnect_all: flag indicating disconnect all QPs
+ * teardown QPs where source or destination addr matches ip addr
  */
-void i40iw_cm_disconnect_all(struct i40iw_device *iwdev)
+void i40iw_cm_teardown_connections(struct i40iw_device *iwdev, u32 *ipaddr,
+                                  struct i40iw_cm_info *nfo,
+                                  bool disconnect_all)
 {
        struct i40iw_cm_core *cm_core = &iwdev->cm_core;
        struct list_head *list_core_temp;
@@ -4245,8 +4251,13 @@ void i40iw_cm_disconnect_all(struct i40iw_device *iwdev)
        spin_lock_irqsave(&cm_core->ht_lock, flags);
        list_for_each_safe(list_node, list_core_temp, &cm_core->connected_nodes) {
                cm_node = container_of(list_node, struct i40iw_cm_node, list);
-               atomic_inc(&cm_node->ref_count);
-               list_add(&cm_node->connected_entry, &connected_list);
+               if (disconnect_all ||
+                   (nfo->vlan_id == cm_node->vlan_id &&
+                   (!memcmp(cm_node->loc_addr, ipaddr, nfo->ipv4 ? 4 : 16) ||
+                    !memcmp(cm_node->rem_addr, ipaddr, nfo->ipv4 ? 4 : 16)))) {
+                       atomic_inc(&cm_node->ref_count);
+                       list_add(&cm_node->connected_entry, &connected_list);
+               }
        }
        spin_unlock_irqrestore(&cm_core->ht_lock, flags);
 
@@ -4280,6 +4291,9 @@ void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
        enum i40iw_quad_hash_manage_type op =
                ifup ? I40IW_QHASH_MANAGE_TYPE_ADD : I40IW_QHASH_MANAGE_TYPE_DELETE;
 
+       nfo.vlan_id = vlan_id;
+       nfo.ipv4 = ipv4;
+
        /* Disable or enable qhash for listeners */
        spin_lock_irqsave(&cm_core->listen_list_lock, flags);
        list_for_each_entry(listen_node, &cm_core->listen_nodes, list) {
@@ -4289,8 +4303,6 @@ void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
                        memcpy(nfo.loc_addr, listen_node->loc_addr,
                               sizeof(nfo.loc_addr));
                        nfo.loc_port = listen_node->loc_port;
-                       nfo.ipv4 = listen_node->ipv4;
-                       nfo.vlan_id = listen_node->vlan_id;
                        nfo.user_pri = listen_node->user_pri;
                        if (!list_empty(&listen_node->child_listen_list)) {
                                i40iw_qhash_ctrl(iwdev,
@@ -4312,7 +4324,7 @@ void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
        }
        spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
 
-       /* disconnect any connected qp's on ifdown */
+       /* teardown connected qp's on ifdown */
        if (!ifup)
-               i40iw_cm_disconnect_all(iwdev);
+               i40iw_cm_teardown_connections(iwdev, ipaddr, &nfo, false);
 }

diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.h b/drivers/infiniband/hw/i40iw/i40iw_cm.h
index 1577608..47638a4 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.h
@@ -453,5 +453,7 @@ int i40iw_arp_table(struct i40iw_device *iwdev,
 
 void i40iw_if_notify(struct i40iw_device *iwdev, struct net_device *netdev,
                     u32 *ipaddr, bool ipv4, bool ifup);
-void i40iw_cm_disconnect_all(struct i40iw_device *iwdev);
+void i40iw_cm_teardown_connections(struct i40iw_device *iwdev, u32 *ipaddr,
+                                  struct i40iw_cm_info *nfo,
+                                  bool disconnect_all);
 #endif /* I40IW_CM_H */

diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c b/drivers/infiniband/hw/i40iw/i40iw_main.c
index a4a8458..8a9815e 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw_main.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_main.c
@@ -1800,7 +1800,7 @@ static void i40iw_close(struct i40e_info *ldev, struct i40e_client *client, bool
        if (reset)
                iwdev->reset = true;
 
-       i40iw_cm_disconnect_all(iwdev);
+       i40iw_cm_teardown_connections(iwdev, NULL, NULL, true);
        destroy_workqueue(iwdev->virtchnl_wq);
        i40iw_deinit_device(iwdev);
 }