netdev - [net-next PATCH 1/2] octeontx2-af: Add support for VLAN based RSS hashing

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Date:   Tue, 22 Sep 2020 18:37:26 +0530
From:   George Cherian <george.cherian@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     George Cherian <george.cherian@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Geetha sowjanya <gakula@...vell.com>,
        Jerin Jacob <jerinj@...vell.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [net-next PATCH 1/2] octeontx2-af: Add support for VLAN based RSS hashing

Added support for PF/VF drivers to choose RSS flow key algorithm
with VLAN tag included in hashing input data. Only CTAG is considered.

Signed-off-by: George Cherian <george.cherian@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/mbox.h    | 1 +
 drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index 4aaef0a2b51c..aa3bda3f34be 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -625,6 +625,7 @@ struct nix_rss_flowkey_cfg {
 #define NIX_FLOW_KEY_TYPE_INNR_UDP      BIT(15)
 #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)
 	u32	flowkey_cfg; /* Flowkey types selected */
 	u8	group;       /* RSS context or group */
 };
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
index 08181fc5f5d4..4bdc4baa3c59 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_nix.c
@@ -2509,6 +2509,14 @@ static int set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
 			field->ltype_match = NPC_LT_LE_GTPU;
 			field->ltype_mask = 0xF;
 			break;
+		case NIX_FLOW_KEY_TYPE_VLAN:
+			field->lid = NPC_LID_LB;
+			field->hdr_offset = 2; /* Skip TPID (2-bytes) */
+			field->bytesm1 = 1; /* 2 Bytes (Actually 12 bits) */
+			field->ltype_match = NPC_LT_LB_CTAG;
+			field->ltype_mask = 0xF;
+			field->fn_mask = 1; /* Mask out the first nibble */
+			break;
 		}
 		field->ena = 1;
 
-- 
2.25.1