RDMA/nes: Fix stale ARP issue

When the remote node's ethernet address changes, the connection keeps
trying to connect using the old address.  The connection wil continue
failing until the driver is unloaded and loaded again (eiter reboot or
rmmod).  Fix this by checking that the NIC has the correct address
before starting a connection.

Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index 4acf04a03e1cffdcae4040e314b57d130c2d8776..39468c277036d5fde84b01c07d3080867ff79dc6 100644 (file)
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -1098,12 +1098,13 @@ static inline int mini_cm_accelerated(struct nes_cm_core *cm_core,
 /**
  * nes_addr_resolve_neigh
  */
-static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
+static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip, int arpindex)
 {
        struct rtable *rt;
        struct flowi fl;
        struct neighbour *neigh;
-       int rc = -1;
+       int rc = arpindex;
+       struct nes_adapter *nesadapter = nesvnic->nesdev->nesadapter;
 
        memset(&fl, 0, sizeof fl);
        fl.nl_u.ip4_u.daddr = htonl(dst_ip);
@@ -1119,6 +1120,21 @@ static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
                        nes_debug(NES_DBG_CM, "Neighbor MAC address for 0x%08X"
                                  " is %pM, Gateway is 0x%08X \n", dst_ip,
                                  neigh->ha, ntohl(rt->rt_gateway));
+
+                       if (arpindex >= 0) {
+                               if (!memcmp(nesadapter->arp_table[arpindex].mac_addr,
+                                                       neigh->ha, ETH_ALEN)){
+                                       /* Mac address same as in nes_arp_table */
+                                       neigh_release(neigh);
+                                       ip_rt_put(rt);
+                                       return rc;
+                               }
+
+                               nes_manage_arp_cache(nesvnic->netdev,
+                                               nesadapter->arp_table[arpindex].mac_addr,
+                                               dst_ip, NES_ARP_DELETE);
+                       }
+
                        nes_manage_arp_cache(nesvnic->netdev, neigh->ha,
                                             dst_ip, NES_ARP_ADD);
                        rc = nes_arp_table(nesvnic->nesdev, dst_ip, NULL,
@@ -1134,7 +1150,6 @@ static int nes_addr_resolve_neigh(struct nes_vnic *nesvnic, u32 dst_ip)
        return rc;
 }
 
-
 /**
  * make_cm_node - create a new instance of a cm node
  */
@@ -1144,6 +1159,7 @@ static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
 {
        struct nes_cm_node *cm_node;
        struct timespec ts;
+       int oldarpindex = 0;
        int arpindex = 0;
        struct nes_device *nesdev;
        struct nes_adapter *nesadapter;
@@ -1197,17 +1213,18 @@ static struct nes_cm_node *make_cm_node(struct nes_cm_core *cm_core,
        nesadapter = nesdev->nesadapter;
 
        cm_node->loopbackpartner = NULL;
+
        /* get the mac addr for the remote node */
        if (ipv4_is_loopback(htonl(cm_node->rem_addr)))
                arpindex = nes_arp_table(nesdev, ntohl(nesvnic->local_ipaddr), NULL, NES_ARP_RESOLVE);
-       else
-               arpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
+       else {
+               oldarpindex = nes_arp_table(nesdev, cm_node->rem_addr, NULL, NES_ARP_RESOLVE);
+               arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr, oldarpindex);
+
+       }
        if (arpindex < 0) {
-               arpindex = nes_addr_resolve_neigh(nesvnic, cm_info->rem_addr);
-               if (arpindex < 0) {
-                       kfree(cm_node);
-                       return NULL;
-               }
+               kfree(cm_node);
+               return NULL;
        }
 
        /* copy the mac addr to node context */