octeontx2-af: Exact match scan from kex profile

CN10KB silicon supports exact match table. Scanning KEX
profile should check for exact match feature is enabled
and then set profile masks properly.

These kex profile masks are required to configure NPC
MCAM drop rules. If there is a miss in exact match table,
these drop rules will drop those packets.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/npc.h b/drivers/net/ethernet/marvell/octeontx2/af/npc.h
index 69f9517c61f43236b89932f3f1e716c6b6d53e8e..f187293e3e08446fc1642b1d25a615069fc4e105 100644 (file)
--- a/drivers/net/ethernet/marvell/octeontx2/af/npc.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/npc.h
@@ -208,6 +208,7 @@ enum key_fields {
        NPC_ERRLEV,
        NPC_ERRCODE,
        NPC_LXMB,
+       NPC_EXACT_RESULT,
        NPC_LA,
        NPC_LB,
        NPC_LC,

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
index 08a0fa44857e049d58d26c3a2daa7191abf324a1..4a8618731fc6a8c52c716da4c062aee24a3a627d 100644 (file)
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
@@ -229,6 +229,25 @@ static bool npc_check_field(struct rvu *rvu, int blkaddr, enum key_fields type,
        return true;
 }
 
+static void npc_scan_exact_result(struct npc_mcam *mcam, u8 bit_number,
+                                 u8 key_nibble, u8 intf)
+{
+       u8 offset = (key_nibble * 4) % 64; /* offset within key word */
+       u8 kwi = (key_nibble * 4) / 64; /* which word in key */
+       u8 nr_bits = 4; /* bits in a nibble */
+       u8 type;
+
+       switch (bit_number) {
+       case 40 ... 43:
+               type = NPC_EXACT_RESULT;
+               break;
+
+       default:
+               return;
+       }
+       npc_set_kw_masks(mcam, type, nr_bits, kwi, offset, intf);
+}
+
 static void npc_scan_parse_result(struct npc_mcam *mcam, u8 bit_number,
                                  u8 key_nibble, u8 intf)
 {
@@ -511,8 +530,8 @@ static int npc_scan_kex(struct rvu *rvu, int blkaddr, u8 intf)
 {
        struct npc_mcam *mcam = &rvu->hw->mcam;
        u8 lid, lt, ld, bitnr;
+       u64 cfg, masked_cfg;
        u8 key_nibble = 0;
-       u64 cfg;
 
        /* Scan and note how parse result is going to be in key.
         * A bit set in PARSE_NIBBLE_ENA corresponds to a nibble from
@@ -520,12 +539,24 @@ static int npc_scan_kex(struct rvu *rvu, int blkaddr, u8 intf)
         * will be concatenated in key.
         */
        cfg = rvu_read64(rvu, blkaddr, NPC_AF_INTFX_KEX_CFG(intf));
-       cfg &= NPC_PARSE_NIBBLE;
-       for_each_set_bit(bitnr, (unsigned long *)&cfg, 31) {
+       masked_cfg = cfg & NPC_PARSE_NIBBLE;
+       for_each_set_bit(bitnr, (unsigned long *)&masked_cfg, 31) {
                npc_scan_parse_result(mcam, bitnr, key_nibble, intf);
                key_nibble++;
        }
 
+       /* Ignore exact match bits for mcam entries except the first rule
+        * which is drop on hit. This first rule is configured explitcitly by
+        * exact match code.
+        */
+       masked_cfg = cfg & NPC_EXACT_NIBBLE;
+       bitnr = NPC_EXACT_NIBBLE_START;
+       for_each_set_bit_from(bitnr, (unsigned long *)&masked_cfg,
+                             NPC_EXACT_NIBBLE_START) {
+               npc_scan_exact_result(mcam, bitnr, key_nibble, intf);
+               key_nibble++;
+       }
+
        /* Scan and note how layer data is going to be in key */
        for (lid = 0; lid < NPC_MAX_LID; lid++) {
                for (lt = 0; lt < NPC_MAX_LT; lt++) {