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From:   Suman Ghosh <sumang@marvell.com>
To:     <sgoutham@marvell.com>, <gakula@marvell.com>,
        <sbhatta@marvell.com>, <hkelam@marvell.com>, <davem@davemloft.net>,
        <edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>,
        <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     Suman Ghosh <sumang@marvell.com>
Subject: [net PATCH V3 1/2] octeontx2-af: Fix hash extraction mbox message
Date:   Mon, 17 Jul 2023 01:00:48 +0530
Message-ID: <20230716193049.2499410-2-sumang@marvell.com>
In-Reply-To: <20230716193049.2499410-1-sumang@marvell.com>
References: <20230716193049.2499410-1-sumang@marvell.com>
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As of today, hash extraction mbox message response supports only the
secret key which is not a complete solution. This patch fixes that and
adds support to extract both hash mask and hash control along with the
secret key. These are needed to use hash reduction of 128 bit IPv6
address to 32 bit. Hash mask decides on the bits from the 128 bit IPv6
address which should be used for 32 bit hash calculation. After
generating the 32 bit hash, hash control decides how many bits from the
32 bit hash can be taken into consideration.

Fixes: a95ab93550d3 ("octeontx2-af: Use hashed field in MCAM key")
Signed-off-by: Suman Ghosh <sumang@marvell.com>
---
 .../net/ethernet/marvell/octeontx2/af/mbox.h  |  6 ++---
 .../marvell/octeontx2/af/rvu_npc_hash.c       | 27 ++++++++++---------
 .../marvell/octeontx2/af/rvu_npc_hash.h       |  9 ++++---
 3 files changed, 23 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index eba307eee2b2..5a5c23a02261 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -246,9 +246,9 @@ M(NPC_MCAM_READ_BASE_RULE, 0x6011, npc_read_base_steer_rule,            \
 M(NPC_MCAM_GET_STATS, 0x6012, npc_mcam_entry_stats,                     \
 				   npc_mcam_get_stats_req,              \
 				   npc_mcam_get_stats_rsp)              \
-M(NPC_GET_FIELD_HASH_INFO, 0x6013, npc_get_field_hash_info,                     \
-				   npc_get_field_hash_info_req,              \
-				   npc_get_field_hash_info_rsp)              \
+M(NPC_GET_FIELD_HASH_INFO, 0x6013, npc_get_field_hash_info,             \
+				   npc_get_field_hash_info_req,         \
+				   npc_get_field_hash_info_rsp)         \
 M(NPC_GET_FIELD_STATUS, 0x6014, npc_get_field_status,                     \
 				   npc_get_field_status_req,              \
 				   npc_get_field_status_rsp)              \
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c
index 6fe67f3a7f6f..a3bc53d22dc0 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c
@@ -96,7 +96,7 @@ u32 npc_field_hash_calc(u64 *ldata, struct npc_get_field_hash_info_rsp rsp,
 	field_hash = rvu_npc_toeplitz_hash(data_padded, hash_key, 128, 159);
 
 	field_hash &= FIELD_GET(GENMASK(63, 32), rsp.hash_ctrl[intf][hash_idx]);
-	field_hash += FIELD_GET(GENMASK(31, 0), rsp.hash_ctrl[intf][hash_idx]);
+	field_hash |= FIELD_GET(GENMASK(31, 0), rsp.hash_ctrl[intf][hash_idx]);
 	return field_hash;
 }
 
@@ -253,7 +253,8 @@ void npc_update_field_hash(struct rvu *rvu, u8 intf,
 	}
 
 	req.intf = intf;
-	rvu_mbox_handler_npc_get_field_hash_info(rvu, &req, &rsp);
+	if (rvu_mbox_handler_npc_get_field_hash_info(rvu, &req, &rsp))
+		return;
 
 	for (hash_idx = 0; hash_idx < NPC_MAX_HASH; hash_idx++) {
 		cfg = rvu_read64(rvu, blkaddr, NPC_AF_INTFX_HASHX_CFG(intf, hash_idx));
@@ -319,9 +320,9 @@ int rvu_mbox_handler_npc_get_field_hash_info(struct rvu *rvu,
 					     struct npc_get_field_hash_info_req *req,
 					     struct npc_get_field_hash_info_rsp *rsp)
 {
+	int hash_idx, hash_mask_idx, blkaddr;
 	u64 *secret_key = rsp->secret_key;
 	u8 intf = req->intf;
-	int i, j, blkaddr;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0) {
@@ -333,18 +334,18 @@ int rvu_mbox_handler_npc_get_field_hash_info(struct rvu *rvu,
 	secret_key[1] = rvu_read64(rvu, blkaddr, NPC_AF_INTFX_SECRET_KEY1(intf));
 	secret_key[2] = rvu_read64(rvu, blkaddr, NPC_AF_INTFX_SECRET_KEY2(intf));
 
-	for (i = 0; i < NPC_MAX_HASH; i++) {
-		for (j = 0; j < NPC_MAX_HASH_MASK; j++) {
-			rsp->hash_mask[NIX_INTF_RX][i][j] =
-				GET_KEX_LD_HASH_MASK(NIX_INTF_RX, i, j);
-			rsp->hash_mask[NIX_INTF_TX][i][j] =
-				GET_KEX_LD_HASH_MASK(NIX_INTF_TX, i, j);
+	for (hash_idx = 0; hash_idx < NPC_MAX_HASH; hash_idx++)
+		for (hash_mask_idx = 0; hash_mask_idx < NPC_MAX_HASH_MASK; hash_mask_idx++) {
+			rsp->hash_mask[NIX_INTF_RX][hash_idx][hash_mask_idx] =
+				GET_KEX_LD_HASH_MASK(NIX_INTF_RX, hash_idx, hash_mask_idx);
+			rsp->hash_mask[NIX_INTF_TX][hash_idx][hash_mask_idx] =
+				GET_KEX_LD_HASH_MASK(NIX_INTF_TX, hash_idx, hash_mask_idx);
 		}
-	}
 
-	for (i = 0; i < NPC_MAX_INTF; i++)
-		for (j = 0; j < NPC_MAX_HASH; j++)
-			rsp->hash_ctrl[i][j] = GET_KEX_LD_HASH_CTRL(i, j);
+	for (hash_idx = 0; hash_idx < NPC_MAX_INTF; hash_idx++)
+		for (hash_mask_idx = 0; hash_mask_idx < NPC_MAX_HASH; hash_mask_idx++)
+			rsp->hash_ctrl[hash_idx][hash_mask_idx] =
+				GET_KEX_LD_HASH_CTRL(hash_idx, hash_mask_idx);
 
 	return 0;
 }
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.h
index a1c3d987b804..eb9cb311b934 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.h
@@ -12,9 +12,6 @@
 #define RVU_NPC_HASH_SECRET_KEY1 0xa9d5af4c9fbc87b4
 #define RVU_NPC_HASH_SECRET_KEY2 0x5954c9e7
 
-#define NPC_MAX_HASH 2
-#define NPC_MAX_HASH_MASK 2
-
 #define KEX_LD_CFG_USE_HASH(use_hash, bytesm1, hdr_ofs, ena, flags_ena, key_ofs) \
 			    ((use_hash) << 20 | ((bytesm1) << 16) | ((hdr_ofs) << 8) | \
 			     ((ena) << 7) | ((flags_ena) << 6) | ((key_ofs) & 0x3F))
@@ -41,6 +38,12 @@
 	rvu_write64(rvu, blkaddr,	\
 		    NPC_AF_INTFX_HASHX_RESULT_CTRL(intf, ld), cfg)
 
+#define GET_KEX_LD_HASH_CTRL(intf, ld)  \
+	rvu_read64(rvu, blkaddr, NPC_AF_INTFX_HASHX_RESULT_CTRL(intf, ld))
+
+#define GET_KEX_LD_HASH_MASK(intf, ld, mask_idx)	\
+	rvu_read64(rvu, blkaddr, NPC_AF_INTFX_HASHX_MASKX(intf, ld, mask_idx))
+
 struct npc_mcam_kex_hash {
 	/* NPC_AF_INTF(0..1)_LID(0..7)_LT(0..15)_LD(0..1)_CFG */
 	bool lid_lt_ld_hash_en[NPC_MAX_INTF][NPC_MAX_LID][NPC_MAX_LT][NPC_MAX_LD];
-- 
2.25.1