From: Vignesh Sridhar <vignesh.sridhar@intel.com>
Date: Wed, 29 Jul 2020 17:19:12 -0700
Subject: ice: Fix RSS profile locks
Patch-mainline: v5.9-rc1
Git-commit: cdedbab92db4697f5a1d222d2d022cd6af3930e3
References: jsc#SLE-12878

Replacing flow profile locks with RSS profile locks in the function to
remove all RSS rules for a given VSI. This is to align the locks used
for RSS rule addition to VSI and removal during VSI teardown to avoid
a race condition owing to several iterations of the above operations.
In function to get RSS rules for given VSI and protocol header replacing
the pointer reference of the RSS entry with a copy of hash value to
ensure thread safety.

Signed-off-by: Vignesh Sridhar <vignesh.sridhar@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_flow.c |   13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/intel/ice/ice_flow.c
+++ b/drivers/net/ethernet/intel/ice/ice_flow.c
@@ -1187,7 +1187,7 @@ enum ice_status ice_rem_vsi_rss_cfg(stru
 	if (list_empty(&hw->fl_profs[blk]))
 		return 0;
 
-	mutex_lock(&hw->fl_profs_locks[blk]);
+	mutex_lock(&hw->rss_locks);
 	list_for_each_entry_safe(p, t, &hw->fl_profs[blk], l_entry)
 		if (test_bit(vsi_handle, p->vsis)) {
 			status = ice_flow_disassoc_prof(hw, blk, p, vsi_handle);
@@ -1195,12 +1195,12 @@ enum ice_status ice_rem_vsi_rss_cfg(stru
 				break;
 
 			if (bitmap_empty(p->vsis, ICE_MAX_VSI)) {
-				status = ice_flow_rem_prof_sync(hw, blk, p);
+				status = ice_flow_rem_prof(hw, blk, p->id);
 				if (status)
 					break;
 			}
 		}
-	mutex_unlock(&hw->fl_profs_locks[blk]);
+	mutex_unlock(&hw->rss_locks);
 
 	return status;
 }
@@ -1597,7 +1597,8 @@ enum ice_status ice_replay_rss_cfg(struc
  */
 u64 ice_get_rss_cfg(struct ice_hw *hw, u16 vsi_handle, u32 hdrs)
 {
-	struct ice_rss_cfg *r, *rss_cfg = NULL;
+	u64 rss_hash = ICE_HASH_INVALID;
+	struct ice_rss_cfg *r;
 
 	/* verify if the protocol header is non zero and VSI is valid */
 	if (hdrs == ICE_FLOW_SEG_HDR_NONE || !ice_is_vsi_valid(hw, vsi_handle))
@@ -1607,10 +1608,10 @@ u64 ice_get_rss_cfg(struct ice_hw *hw, u
 	list_for_each_entry(r, &hw->rss_list_head, l_entry)
 		if (test_bit(vsi_handle, r->vsis) &&
 		    r->packet_hdr == hdrs) {
-			rss_cfg = r;
+			rss_hash = r->hashed_flds;
 			break;
 		}
 	mutex_unlock(&hw->rss_locks);
 
-	return rss_cfg ? rss_cfg->hashed_flds : ICE_HASH_INVALID;
+	return rss_hash;
 }