octeontx2-af: NIX Rx flowkey configuration for RSS

Configure NIX RX flowkey algorithm configuration to support
RSS (receive side scaling). Currently support for only L3/L4
2-tuple and 4-tuple hash of IPv4/v6/TCP/UDP/SCTP is added.
HW supports upto 32 different flowkey algorithms which SW
can define, this patch defines 9. NPC RX ACTION has to point
to one of these flowkey indices for RSS to work.

The configuration is dependent on NPC parse result's layer
info. So if NPC KPU profile changes suchthat LID/LTYPE values
of above said protocols change then this configuration will
most likely be effected.

Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -186,4 +186,26 @@ enum nix_scheduler {
 #define DEFAULT_RSS_CONTEXT_GROUP	0
 #define MAX_RSS_INDIR_TBL_SIZE		256 /* 1 << Max adder bits */
 
+/* NIX flow tag, key type flags */
+#define FLOW_KEY_TYPE_PORT	BIT(0)
+#define FLOW_KEY_TYPE_IPV4	BIT(1)
+#define FLOW_KEY_TYPE_IPV6	BIT(2)
+#define FLOW_KEY_TYPE_TCP	BIT(3)
+#define FLOW_KEY_TYPE_UDP	BIT(4)
+#define FLOW_KEY_TYPE_SCTP	BIT(5)
+
+/* NIX flow tag algorithm indices, max is 31 */
+enum {
+	FLOW_KEY_ALG_PORT,
+	FLOW_KEY_ALG_IP,
+	FLOW_KEY_ALG_TCP,
+	FLOW_KEY_ALG_UDP,
+	FLOW_KEY_ALG_SCTP,
+	FLOW_KEY_ALG_TCP_UDP,
+	FLOW_KEY_ALG_TCP_SCTP,
+	FLOW_KEY_ALG_UDP_SCTP,
+	FLOW_KEY_ALG_TCP_UDP_SCTP,
+	FLOW_KEY_ALG_MAX,
+};
+
 #endif /* COMMON_H */

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

@@ -1536,6 +1536,139 @@ int rvu_mbox_handler_NIX_STATS_RST(struct rvu *rvu, struct msg_req *req,
 	return 0;
 }
 
+static void set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
+{
+	struct nix_rx_flowkey_alg *field = NULL;
+	int idx, key_type;
+
+	if (!alg)
+		return;
+
+	/* FIELD0: IPv4
+	 * FIELD1: IPv6
+	 * FIELD2: TCP/UDP/SCTP/ALL
+	 * FIELD3: Unused
+	 * FIELD4: Unused
+	 *
+	 * Each of the 32 possible flow key algorithm definitions should
+	 * fall into above incremental config (except ALG0). Otherwise a
+	 * single NPC MCAM entry is not sufficient for supporting RSS.
+	 *
+	 * If a different definition or combination needed then NPC MCAM
+	 * has to be programmed to filter such pkts and it's action should
+	 * point to this definition to calculate flowtag or hash.
+	 */
+	for (idx = 0; idx < 32; idx++) {
+		key_type = flow_cfg & BIT_ULL(idx);
+		if (!key_type)
+			continue;
+		switch (key_type) {
+		case FLOW_KEY_TYPE_PORT:
+			field = &alg[0];
+			field->sel_chan = true;
+			/* This should be set to 1, when SEL_CHAN is set */
+			field->bytesm1 = 1;
+			break;
+		case FLOW_KEY_TYPE_IPV4:
+			field = &alg[0];
+			field->lid = NPC_LID_LC;
+			field->ltype_match = NPC_LT_LC_IP;
+			field->hdr_offset = 12; /* SIP offset */
+			field->bytesm1 = 7; /* SIP + DIP, 8 bytes */
+			field->ltype_mask = 0xF; /* Match only IPv4 */
+			break;
+		case FLOW_KEY_TYPE_IPV6:
+			field = &alg[1];
+			field->lid = NPC_LID_LC;
+			field->ltype_match = NPC_LT_LC_IP6;
+			field->hdr_offset = 8; /* SIP offset */
+			field->bytesm1 = 31; /* SIP + DIP, 32 bytes */
+			field->ltype_mask = 0xF; /* Match only IPv6 */
+			break;
+		case FLOW_KEY_TYPE_TCP:
+		case FLOW_KEY_TYPE_UDP:
+		case FLOW_KEY_TYPE_SCTP:
+			field = &alg[2];
+			field->lid = NPC_LID_LD;
+			field->bytesm1 = 3; /* Sport + Dport, 4 bytes */
+			if (key_type == FLOW_KEY_TYPE_TCP)
+				field->ltype_match |= NPC_LT_LD_TCP;
+			else if (key_type == FLOW_KEY_TYPE_UDP)
+				field->ltype_match |= NPC_LT_LD_UDP;
+			else if (key_type == FLOW_KEY_TYPE_SCTP)
+				field->ltype_match |= NPC_LT_LD_SCTP;
+			field->key_offset = 32; /* After IPv4/v6 SIP, DIP */
+			field->ltype_mask = ~field->ltype_match;
+			break;
+		}
+		if (field)
+			field->ena = 1;
+		field = NULL;
+	}
+}
+
+static void nix_rx_flowkey_alg_cfg(struct rvu *rvu, int blkaddr)
+{
+#define FIELDS_PER_ALG	5
+	u64 field[FLOW_KEY_ALG_MAX][FIELDS_PER_ALG];
+	u32 flowkey_cfg, minkey_cfg;
+	int alg, fid;
+
+	memset(&field, 0, sizeof(u64) * FLOW_KEY_ALG_MAX * FIELDS_PER_ALG);
+
+	/* Only incoming channel number */
+	flowkey_cfg = FLOW_KEY_TYPE_PORT;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_PORT], flowkey_cfg);
+
+	/* For a incoming pkt if none of the fields match then flowkey
+	 * will be zero, hence tag generated will also be zero.
+	 * RSS entry at rsse_index = NIX_AF_LF()_RSS_GRP()[OFFSET] will
+	 * be used to queue the packet.
+	 */
+
+	/* IPv4/IPv6 SIP/DIPs */
+	flowkey_cfg = FLOW_KEY_TYPE_IPV4 | FLOW_KEY_TYPE_IPV6;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_IP], flowkey_cfg);
+
+	/* TCPv4/v6 4-tuple, SIP, DIP, Sport, Dport */
+	minkey_cfg = flowkey_cfg;
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_TCP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_TCP], flowkey_cfg);
+
+	/* UDPv4/v6 4-tuple, SIP, DIP, Sport, Dport */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_UDP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_UDP], flowkey_cfg);
+
+	/* SCTPv4/v6 4-tuple, SIP, DIP, Sport, Dport */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_SCTP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_SCTP], flowkey_cfg);
+
+	/* TCP/UDP v4/v6 4-tuple, rest IP pkts 2-tuple */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_TCP | FLOW_KEY_TYPE_UDP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_TCP_UDP], flowkey_cfg);
+
+	/* TCP/SCTP v4/v6 4-tuple, rest IP pkts 2-tuple */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_TCP | FLOW_KEY_TYPE_SCTP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_TCP_SCTP], flowkey_cfg);
+
+	/* UDP/SCTP v4/v6 4-tuple, rest IP pkts 2-tuple */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_UDP | FLOW_KEY_TYPE_SCTP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_UDP_SCTP], flowkey_cfg);
+
+	/* TCP/UDP/SCTP v4/v6 4-tuple, rest IP pkts 2-tuple */
+	flowkey_cfg = minkey_cfg | FLOW_KEY_TYPE_TCP |
+		      FLOW_KEY_TYPE_UDP | FLOW_KEY_TYPE_SCTP;
+	set_flowkey_fields((void *)&field[FLOW_KEY_ALG_TCP_UDP_SCTP],
+			   flowkey_cfg);
+
+	for (alg = 0; alg < FLOW_KEY_ALG_MAX; alg++) {
+		for (fid = 0; fid < FIELDS_PER_ALG; fid++)
+			rvu_write64(rvu, blkaddr,
+				    NIX_AF_RX_FLOW_KEY_ALGX_FIELDX(alg, fid),
+				    field[alg][fid]);
+	}
+}
+
 static int nix_calibrate_x2p(struct rvu *rvu, int blkaddr)
 {
 	int idx, err;
@@ -1678,6 +1811,8 @@ int rvu_nix_init(struct rvu *rvu)
 			    (NPC_LID_LD << 8) | (NPC_LT_LD_TCP << 4) | 0x0F);
 		rvu_write64(rvu, blkaddr, NIX_AF_RX_DEF_OIP4,
 			    (NPC_LID_LC << 8) | (NPC_LT_LC_IP << 4) | 0x0F);
+
+		nix_rx_flowkey_alg_cfg(rvu, blkaddr);
 	}
 	return 0;
 }

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

@@ -879,6 +879,36 @@ struct nix_lso_format {
 #endif
 };
 
+struct nix_rx_flowkey_alg {
+#if defined(__BIG_ENDIAN_BITFIELD)
+	u64 reserved_35_63	:29;
+	u64 ltype_match		:4;
+	u64 ltype_mask		:4;
+	u64 sel_chan		:1;
+	u64 ena			:1;
+	u64 reserved_24_24	:1;
+	u64 lid			:3;
+	u64 bytesm1		:5;
+	u64 hdr_offset		:8;
+	u64 fn_mask		:1;
+	u64 ln_mask		:1;
+	u64 key_offset		:6;
+#else
+	u64 key_offset		:6;
+	u64 ln_mask		:1;
+	u64 fn_mask		:1;
+	u64 hdr_offset		:8;
+	u64 bytesm1		:5;
+	u64 lid			:3;
+	u64 reserved_24_24	:1;
+	u64 ena			:1;
+	u64 sel_chan		:1;
+	u64 ltype_mask		:4;
+	u64 ltype_match		:4;
+	u64 reserved_35_63	:29;
+#endif
+};
+
 /* NIX VTAG size */
 enum nix_vtag_size {
 	VTAGSIZE_T4   = 0x0,