cxgb4: add TC-MATCHALL classifier ingress offload

Add TC-MATCHALL classifier ingress offload support. The same actions
supported by existing TC-FLOWER offload can be applied to all incoming
traffic on the underlying interface.

Ensure the rule priority doesn't conflict with existing rules in the
TCAM. Only 1 ingress matchall rule can be active at a time on the
underlying interface.

v5:
- No change.

v4:
- Added check to ensure the matchall rule's prio doesn't conflict with
  other rules in TCAM.
- Added logic to fill default mask for VIID, if none has been
  provided, to prevent conflict with duplicate VIID rules.
- Used existing variables in private structure to fill VIID info,
  instead of extracting the info manually.

v3:
- No change.

v2:
- Removed logic to fetch free index from end of TCAM. Must maintain
  same ordering as in kernel.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
index 8bdcccea47d5..1d39fca11810 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -872,6 +872,12 @@ static void fill_default_mask(struct ch_filter_specification *fs)
 		fs->mask.tos |= ~0;
 	if (fs->val.proto && !fs->mask.proto)
 		fs->mask.proto |= ~0;
+	if (fs->val.pfvf_vld && !fs->mask.pfvf_vld)
+		fs->mask.pfvf_vld |= ~0;
+	if (fs->val.pf && !fs->mask.pf)
+		fs->mask.pf |= ~0;
+	if (fs->val.vf && !fs->mask.vf)
+		fs->mask.vf |= ~0;
 
 	for (i = 0; i < ARRAY_SIZE(fs->val.lip); i++) {
 		lip |= fs->val.lip[i];