L2 table code. This is enough to get the T4's switch + L2 rewrite

filters working.  (All other filters - switch without L2 info rewrite,
steer, and drop - were already fully-functional).

Some contrived examples of "switch" filters with L2 rewriting:

# cxgbetool t4nex0  iport 0  dport 80  action switch  vlan +9  eport 3
Intercept all packets received on physical port 0 with TCP port 80 as
destination, insert a vlan tag with VID 9, and send them out of port 3.

# cxgbetool t4nex0  sip 192.168.1.1/32  ivlan 5  action switch \
	vlan =9  smac aa:bb:cc:dd:ee:ff  eport 0
Intercept all packets (received on any port) with source IP address
192.168.1.1 and VLAN id 5, rewrite the VLAN id to 9, rewrite source mac
to aa:bb:cc:dd:ee:ff, and send it out of port 0.

MFC after:	1 week

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/dev/cxgbe/t4_ioctl.h b/sys/dev/cxgbe/t4_ioctl.h
index 8f1d133..a0b489f 100644
--- a/sys/dev/cxgbe/t4_ioctl.h
+++ b/sys/dev/cxgbe/t4_ioctl.h
@@ -178,6 +178,8 @@ struct t4_filter_specification {
 
 struct t4_filter {
 	uint32_t idx;
+	uint16_t l2tidx;
+	uint16_t smtidx;
 	uint64_t hits;
 	struct t4_filter_specification fs;
 };