cxgb4: add TC-MATCHALL classifier egress offload

Add TC-MATCHALL classifier offload with TC-POLICE action applied for
all outgoing traffic on the underlying interface. Split flow block
offload to support both egress and ingress classification.

For example, to rate limit all outgoing traffic to 1 Gbps:

$ tc qdisc add dev enp2s0f4 clsact
$ tc filter add dev enp2s0f4 egress matchall skip_sw \
	action police rate 1Gbit burst 8Kbit

Note that skip_sw is important. Otherwise, both stack and hardware
will end up doing policing. Policing can't be shared across flow
blocks. Only 1 egress matchall rule can be active at a time on the
underlying interface.

v5:
- No change.

v4:
- Removed check to reject police offload if prio is not 1.
- Moved TC_SETUP_BLOCK code to separate function.

v3:
- Added check to reject police offload if prio is not 1.
- Assign block_shared variable only for TC_SETUP_BLOCK.

v2:
- Added check to reject flow block sharing for policers.

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

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
index ce442c63f496..db55673b77bd 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
@@ -11,8 +11,7 @@ static int cxgb4_mqprio_validate(struct net_device *dev,
 	u64 min_rate = 0, max_rate = 0, max_link_rate;
 	struct port_info *pi = netdev2pinfo(dev);
 	struct adapter *adap = netdev2adap(dev);
-	u32 qcount = 0, qoffset = 0;
-	u32 link_ok, speed, mtu;
+	u32 speed, qcount = 0, qoffset = 0;
 	int ret;
 	u8 i;
 
@@ -35,7 +34,7 @@ static int cxgb4_mqprio_validate(struct net_device *dev,
 		return -ERANGE;
 	}
 
-	ret = t4_get_link_params(pi, &link_ok, &speed, &mtu);
+	ret = t4_get_link_params(pi, NULL, &speed, NULL);
 	if (ret) {
 		netdev_err(dev, "Failed to get link speed, ret: %d\n", ret);
 		return -EINVAL;