octeontx2-pf: Support to change VLAN based RSS hash options via ethtool

Add support to control rx-flow-hash based on VLAN.
By default VLAN plus 4-tuple based hashing is enabled.
Changes can be done runtime using ethtool

To enable 2-tuple plus VLAN based flow distribution
  # ethtool -N <intf> rx-flow-hash <prot> sdv
To enable 4-tuple plus VLAN based flow distribution
  # ethtool -N <intf> rx-flow-hash <prot> sdfnv

Signed-off-by: George Cherian <[email protected]>
Signed-off-by: Sunil Goutham <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: georgecherian81

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c

@@ -355,7 +355,7 @@ int otx2_rss_init(struct otx2_nic *pfvf)
 	rss->flowkey_cfg = rss->enable ? rss->flowkey_cfg :
 			   NIX_FLOW_KEY_TYPE_IPV4 | NIX_FLOW_KEY_TYPE_IPV6 |
 			   NIX_FLOW_KEY_TYPE_TCP | NIX_FLOW_KEY_TYPE_UDP |
-			   NIX_FLOW_KEY_TYPE_SCTP;
+			   NIX_FLOW_KEY_TYPE_SCTP | NIX_FLOW_KEY_TYPE_VLAN;
 
 	ret = otx2_set_flowkey_cfg(pfvf);
 	if (ret)

drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c

@@ -428,6 +428,8 @@ static int otx2_get_rss_hash_opts(struct otx2_nic *pfvf,
 
 	/* Mimimum is IPv4 and IPv6, SIP/DIP */
 	nfc->data = RXH_IP_SRC | RXH_IP_DST;
+	if (rss->flowkey_cfg & NIX_FLOW_KEY_TYPE_VLAN)
+		nfc->data |= RXH_VLAN;
 
 	switch (nfc->flow_type) {
 	case TCP_V4_FLOW:
@@ -477,6 +479,11 @@ static int otx2_set_rss_hash_opts(struct otx2_nic *pfvf,
 	if (!(nfc->data & RXH_IP_SRC) || !(nfc->data & RXH_IP_DST))
 		return -EINVAL;
 
+	if (nfc->data & RXH_VLAN)
+		rss_cfg |=  NIX_FLOW_KEY_TYPE_VLAN;
+	else
+		rss_cfg &= ~NIX_FLOW_KEY_TYPE_VLAN;
+
 	switch (nfc->flow_type) {
 	case TCP_V4_FLOW:
 	case TCP_V6_FLOW: