octeontx2-af: Add support for RSS hashing based on Transport protocol field

Add support to choose RSS flow key algorithm with IPv4 transport protocol
field included in hashing input data. This will be enabled by default.
There-by enabling 3/5 tuple hash
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: George Cherian <george.cherian@marvell.com>
Link: https://lore.kernel.org/r/20201120093906.2873616-1-george.cherian@marvell.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeontx2/af/mbox.h

@@ -716,6 +716,7 @@ struct nix_rss_flowkey_cfg {
 #define NIX_FLOW_KEY_TYPE_INNR_SCTP     BIT(16)
 #define NIX_FLOW_KEY_TYPE_INNR_ETH_DMAC BIT(17)
 #define NIX_FLOW_KEY_TYPE_VLAN		BIT(20)
+#define NIX_FLOW_KEY_TYPE_IPV4_PROTO	BIT(21)
 	u32	flowkey_cfg; /* Flowkey types selected */
 	u8	group;       /* RSS context or group */
 };

drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c

@@ -2626,6 +2626,13 @@ static int set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
 			/* This should be set to 1, when SEL_CHAN is set */
 			field->bytesm1 = 1;
 			break;
+		case NIX_FLOW_KEY_TYPE_IPV4_PROTO:
+			field->lid = NPC_LID_LC;
+			field->hdr_offset = 9; /* offset */
+			field->bytesm1 = 0; /* 1 byte */
+			field->ltype_match = NPC_LT_LC_IP;
+			field->ltype_mask = 0xF;
+			break;
 		case NIX_FLOW_KEY_TYPE_IPV4:
 		case NIX_FLOW_KEY_TYPE_INNR_IPV4:
 			field->lid = NPC_LID_LC;

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

@@ -359,7 +359,8 @@ 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_VLAN;
+			   NIX_FLOW_KEY_TYPE_SCTP | NIX_FLOW_KEY_TYPE_VLAN |
+			   NIX_FLOW_KEY_TYPE_IPV4_PROTO;
 
 	ret = otx2_set_flowkey_cfg(pfvf);
 	if (ret)