1 files changed, 42 insertions, 1 deletions

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..7e20282c12d0 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_hash.c
@@ -218,13 +218,54 @@ void npc_config_secret_key(struct rvu *rvu, int blkaddr)
 
 void npc_program_mkex_hash(struct rvu *rvu, int blkaddr)
 {
+	struct npc_mcam_kex_hash *mh = rvu->kpu.mkex_hash;
 	struct hw_cap *hwcap = &rvu->hw->cap;
+	u8 intf, ld, hdr_offset, byte_len;
 	struct rvu_hwinfo *hw = rvu->hw;
-	u8 intf;
+	u64 cfg;
 
+	/* Check if hardware supports hash extraction */
 	if (!hwcap->npc_hash_extract)
 		return;
 
+	/* Check if IPv6 source/destination address
+	 * should be hash enabled.
+	 * Hashing reduces 128bit SIP/DIP fields to 32bit
+	 * so that 224 bit X2 key can be used for IPv6 based filters as well,
+	 * which in turn results in more number of MCAM entries available for
+	 * use.
+	 *
+	 * Hashing of IPV6 SIP/DIP is enabled in below scenarios
+	 * 1. If the silicon variant supports hashing feature
+	 * 2. If the number of bytes of IP addr being extracted is 4 bytes ie
+	 *    32bit. The assumption here is that if user wants 8bytes of LSB of
+	 *    IP addr or full 16 bytes then his intention is not to use 32bit
+	 *    hash.
+	 */
+	for (intf = 0; intf < hw->npc_intfs; intf++) {
+		for (ld = 0; ld < NPC_MAX_LD; ld++) {
+			cfg = rvu_read64(rvu, blkaddr,
+					 NPC_AF_INTFX_LIDX_LTX_LDX_CFG(intf,
+								       NPC_LID_LC,
+								       NPC_LT_LC_IP6,
+								       ld));
+			hdr_offset = FIELD_GET(NPC_HDR_OFFSET, cfg);
+			byte_len = FIELD_GET(NPC_BYTESM, cfg);
+			/* Hashing of IPv6 source/destination address should be
+			 * enabled if,
+			 * hdr_offset == 8 (offset of source IPv6 address) or
+			 * hdr_offset == 24 (offset of destination IPv6)
+			 * address) and the number of byte to be
+			 * extracted is 4. As per hardware configuration
+			 * byte_len should be == actual byte_len - 1.
+			 * Hence byte_len is checked against 3 but nor 4.
+			 */
+			if ((hdr_offset == 8 || hdr_offset == 24) && byte_len == 3)
+				mh->lid_lt_ld_hash_en[intf][NPC_LID_LC][NPC_LT_LC_IP6][ld] = true;
+		}
+	}
+
+	/* Update hash configuration if the field is hash enabled */
 	for (intf = 0; intf < hw->npc_intfs; intf++) {
 		npc_program_mkex_hash_rx(rvu, blkaddr, intf);
 		npc_program_mkex_hash_tx(rvu, blkaddr, intf);