From: Parav Pandit <parav@mellanox.com>
Date: Mon, 23 Apr 2018 16:58:18 +0300
Subject: IB/core: Fix to avoid deleting IPv6 look alike default GIDs
Patch-mainline: v4.17-rc4
Git-commit: 22c01ee4b8a8c000c490dfc479e175404e64167b
References: bsc#1103992 FATE#326009

When IPv6 link local address is removed, if it matches with the default
GID, default GID(s)s gets removed which may not be a desired behavior.
This behavior is introduced by refactor work in Fixes tag.

When IPv6 link address is removed, removing its equivalent RoCEv2 GID
which exactly matches with default RoCEv2 GID, is right thing to do.
However achieving it correctly requires lot more changes, likely in
roce_gid_mgmt.c and core/cache.c. This should be done as independent
patch.

Therefore, this patch preserves behavior of not deleteing default GIDs.
This is done by providing explicit hint to consider default GID property
using mask and default_gid; similar to add_gid().

Fixes: 598ff6bae68 ("IB/core: Refactor GID modify code for RoCE")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/cache.c |   17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -424,8 +424,10 @@ int ib_cache_gid_add(struct ib_device *i
 	return ret;
 }
 
-int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
-		     union ib_gid *gid, struct ib_gid_attr *attr)
+static int
+_ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
+		  union ib_gid *gid, struct ib_gid_attr *attr,
+		  bool default_gid)
 {
 	struct ib_gid_table *table;
 	int ret = 0;
@@ -435,9 +437,10 @@ int ib_cache_gid_del(struct ib_device *i
 
 	mutex_lock(&table->lock);
 
-	ix = find_gid(table, gid, attr, false,
+	ix = find_gid(table, gid, attr, default_gid,
 		      GID_ATTR_FIND_MASK_GID	  |
 		      GID_ATTR_FIND_MASK_GID_TYPE |
+		      GID_ATTR_FIND_MASK_DEFAULT  |
 		      GID_ATTR_FIND_MASK_NETDEV,
 		      NULL);
 	if (ix < 0) {
@@ -456,6 +459,12 @@ out_unlock:
 	return ret;
 }
 
+int ib_cache_gid_del(struct ib_device *ib_dev, u8 port,
+		     union ib_gid *gid, struct ib_gid_attr *attr)
+{
+	return _ib_cache_gid_del(ib_dev, port, gid, attr, false);
+}
+
 int ib_cache_gid_del_all_netdev_gids(struct ib_device *ib_dev, u8 port,
 				     struct net_device *ndev)
 {
@@ -756,7 +765,7 @@ void ib_cache_gid_set_default_gid(struct
 			__ib_cache_gid_add(ib_dev, port, &gid,
 					   &gid_attr, mask, true);
 		} else if (mode == IB_CACHE_GID_DEFAULT_MODE_DELETE) {
-			ib_cache_gid_del(ib_dev, port, &gid, &gid_attr);
+			_ib_cache_gid_del(ib_dev, port, &gid, &gid_attr, true);
 		}
 	}
 }