octeontx2-af: Generate key field bit mask from KEX profile

Key Extraction(KEX) profile decides how the packet metadata such as
layer information and selected packet data bytes at each layer are
placed in MCAM search key. This patch reads the configured KEX profile
parameters to find out the bit position and bit mask for each field.
The information is used when programming the MCAM match data by SW
to match a packet flow and take appropriate action on the flow. This
patch also verifies the mandatory fields such as channel and DMAC
are not overwritten by the KEX configuration of other fields.

Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/octeontx2/af/Makefile

@@ -9,4 +9,4 @@ obj-$(CONFIG_OCTEONTX2_AF) += octeontx2_af.o
 
 octeontx2_mbox-y := mbox.o rvu_trace.o
 octeontx2_af-y := cgx.o rvu.o rvu_cgx.o rvu_npa.o rvu_nix.o \
-		  rvu_reg.o rvu_npc.o rvu_debugfs.o ptp.o
+		  rvu_reg.o rvu_npc.o rvu_debugfs.o ptp.o rvu_npc_fs.o

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

@@ -149,6 +149,54 @@ enum npc_pkind_type {
 	NPC_TX_DEF_PKIND = 63ULL,	/* NIX-TX PKIND */
 };
 
+/* list of known and supported fields in packet header and
+ * fields present in key structure.
+ */
+enum key_fields {
+	NPC_DMAC,
+	NPC_SMAC,
+	NPC_ETYPE,
+	NPC_OUTER_VID,
+	NPC_TOS,
+	NPC_SIP_IPV4,
+	NPC_DIP_IPV4,
+	NPC_SIP_IPV6,
+	NPC_DIP_IPV6,
+	NPC_SPORT_TCP,
+	NPC_DPORT_TCP,
+	NPC_SPORT_UDP,
+	NPC_DPORT_UDP,
+	NPC_SPORT_SCTP,
+	NPC_DPORT_SCTP,
+	NPC_HEADER_FIELDS_MAX,
+	NPC_CHAN = NPC_HEADER_FIELDS_MAX, /* Valid when Rx */
+	NPC_PF_FUNC, /* Valid when Tx */
+	NPC_ERRLEV,
+	NPC_ERRCODE,
+	NPC_LXMB,
+	NPC_LA,
+	NPC_LB,
+	NPC_LC,
+	NPC_LD,
+	NPC_LE,
+	NPC_LF,
+	NPC_LG,
+	NPC_LH,
+	/* Ethertype for untagged frame */
+	NPC_ETYPE_ETHER,
+	/* Ethertype for single tagged frame */
+	NPC_ETYPE_TAG1,
+	/* Ethertype for double tagged frame */
+	NPC_ETYPE_TAG2,
+	/* outer vlan tci for single tagged frame */
+	NPC_VLAN_TAG1,
+	/* outer vlan tci for double tagged frame */
+	NPC_VLAN_TAG2,
+	/* other header fields programmed to extract but not of our interest */
+	NPC_UNKNOWN,
+	NPC_KEY_FIELDS_MAX,
+};
+
 struct npc_kpu_profile_cam {
 	u8 state;
 	u8 state_mask;

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

@@ -15,6 +15,7 @@
 #include "rvu_struct.h"
 #include "common.h"
 #include "mbox.h"
+#include "npc.h"
 
 /* PCI device IDs */
 #define	PCI_DEVID_OCTEONTX2_RVU_AF		0xA065
@@ -105,6 +106,36 @@ struct nix_mce_list {
 	int			max;
 };
 
+/* layer metadata to uniquely identify a packet header field */
+struct npc_layer_mdata {
+	u8 lid;
+	u8 ltype;
+	u8 hdr;
+	u8 key;
+	u8 len;
+};
+
+/* Structure to represent a field present in the
+ * generated key. A key field may present anywhere and can
+ * be of any size in the generated key. Once this structure
+ * is populated for fields of interest then field's presence
+ * and location (if present) can be known.
+ */
+struct npc_key_field {
+	/* Masks where all set bits indicate position
+	 * of a field in the key
+	 */
+	u64 kw_mask[NPC_MAX_KWS_IN_KEY];
+	/* Number of words in the key a field spans. If a field is
+	 * of 16 bytes and key offset is 4 then the field will use
+	 * 4 bytes in KW0, 8 bytes in KW1 and 4 bytes in KW2 and
+	 * nr_kws will be 3(KW0, KW1 and KW2).
+	 */
+	int nr_kws;
+	/* used by packet header fields */
+	struct npc_layer_mdata layer_mdata;
+};
+
 struct npc_mcam {
 	struct rsrc_bmap counters;
 	struct mutex	lock;	/* MCAM entries and counters update lock */
@@ -128,6 +159,11 @@ struct npc_mcam {
 	u16	hprio_count;
 	u16	hprio_end;
 	u16     rx_miss_act_cntr; /* Counter for RX MISS action */
+	/* fields present in the generated key */
+	struct npc_key_field	tx_key_fields[NPC_KEY_FIELDS_MAX];
+	struct npc_key_field	rx_key_fields[NPC_KEY_FIELDS_MAX];
+	u64	tx_features;
+	u64	rx_features;
 };
 
 /* Structure for per RVU func info ie PF/VF */
@@ -537,6 +573,8 @@ bool is_npc_intf_rx(u8 intf);
 bool is_npc_interface_valid(struct rvu *rvu, u8 intf);
 int rvu_npc_get_tx_nibble_cfg(struct rvu *rvu, u64 nibble_ena);
 int npc_mcam_verify_channel(struct rvu *rvu, u16 pcifunc, u8 intf, u16 channel);
+int npc_flow_steering_init(struct rvu *rvu, int blkaddr);
+const char *npc_get_field_name(u8 hdr);
 
 #ifdef CONFIG_DEBUG_FS
 void rvu_dbg_init(struct rvu *rvu);

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

@@ -1400,12 +1400,19 @@ int rvu_npc_init(struct rvu *rvu)
 
 	rvu_npc_setup_interfaces(rvu, blkaddr);
 
+	/* Configure MKEX profile */
+	npc_load_mkex_profile(rvu, blkaddr, rvu->mkex_pfl_name);
+
 	err = npc_mcam_rsrcs_init(rvu, blkaddr);
 	if (err)
 		return err;
 
-	/* Configure MKEX profile */
-	npc_load_mkex_profile(rvu, blkaddr, rvu->mkex_pfl_name);
+	err = npc_flow_steering_init(rvu, blkaddr);
+	if (err) {
+		dev_err(rvu->dev,
+			"Incorrect mkex profile loaded using default mkex\n");
+		npc_load_mkex_profile(rvu, blkaddr, def_pfl_name);
+	}
 
 	return 0;
 }