octeontx2-af: refactor function npc_install_flow for default entry

This patch refactors npc_install_flow function to install AF
installed default MCAM entries similar to other MCAM entries
installed by PF/VF. As a result the code would be more readable
and easy to maintain. Modified npc_verify_entry and npc_verify_channel
to properly check MCAM rules installed by AF.

Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -420,6 +420,11 @@ struct nix_tx_action {
 #define TX_VTAG1_LID_MASK		GENMASK_ULL(42, 40)
 #define TX_VTAG1_RELPTR_MASK		GENMASK_ULL(39, 32)
 
+/* NPC MCAM reserved entry index per nixlf */
+#define NIXLF_UCAST_ENTRY	0
+#define NIXLF_BCAST_ENTRY	1
+#define NIXLF_PROMISC_ENTRY	2
+
 struct npc_mcam_kex {
 	/* MKEX Profle Header */
 	u64 mkex_sign; /* "mcam-kex-profile" (8 bytes/ASCII characters) */

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

@@ -548,6 +548,12 @@ static inline int is_afvf(u16 pcifunc)
 	return !(pcifunc & ~RVU_PFVF_FUNC_MASK);
 }
 
+/* check if PF_FUNC is AF */
+static inline bool is_pffunc_af(u16 pcifunc)
+{
+	return !pcifunc;
+}
+
 static inline bool is_rvu_fwdata_valid(struct rvu *rvu)
 {
 	return (rvu->fwdata->header_magic == RVU_FWDATA_HEADER_MAGIC) &&
@@ -665,9 +671,6 @@ 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);
-bool rvu_npc_write_default_rule(struct rvu *rvu, int blkaddr, int nixlf,
-				u16 pcifunc, u8 intf, struct mcam_entry *entry,
-				int *entry_index);
 int npc_get_bank(struct npc_mcam *mcam, int index);
 void npc_mcam_enable_flows(struct rvu *rvu, u16 target);
 void npc_mcam_disable_flows(struct rvu *rvu, u16 target);
@@ -679,6 +682,11 @@ void npc_read_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
 bool is_mac_feature_supported(struct rvu *rvu, int pf, int feature);
 u32  rvu_cgx_get_fifolen(struct rvu *rvu);
 
+int npc_get_nixlf_mcam_index(struct npc_mcam *mcam, u16 pcifunc, int nixlf,
+			     int type);
+bool is_mcam_entry_enabled(struct rvu *rvu, struct npc_mcam *mcam, int blkaddr,
+			   int index);
+
 /* CPT APIs */
 int rvu_cpt_lf_teardown(struct rvu *rvu, u16 pcifunc, int lf, int slot);
 

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

@@ -2145,7 +2145,7 @@ static int rvu_dbg_npc_mcam_show_rules(struct seq_file *s, void *unused)
 		seq_printf(s, "\tmcam entry: %d\n", iter->entry);
 
 		rvu_dbg_npc_mcam_show_flows(s, iter);
-		if (iter->intf == NIX_INTF_RX) {
+		if (is_npc_intf_rx(iter->intf)) {
 			target = iter->rx_action.pf_func;
 			pf = (target >> RVU_PFVF_PF_SHIFT) & RVU_PFVF_PF_MASK;
 			seq_printf(s, "\tForward to: PF%d ", pf);

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

@@ -22,10 +22,6 @@
 #define RSVD_MCAM_ENTRIES_PER_PF	2 /* Bcast & Promisc */
 #define RSVD_MCAM_ENTRIES_PER_NIXLF	1 /* Ucast for LFs */
 
-#define NIXLF_UCAST_ENTRY	0
-#define NIXLF_BCAST_ENTRY	1
-#define NIXLF_PROMISC_ENTRY	2
-
 #define NPC_PARSE_RESULT_DMAC_OFFSET	8
 #define NPC_HW_TSTAMP_OFFSET		8
 #define NPC_KEX_CHAN_MASK		0xFFFULL
@@ -96,6 +92,10 @@ int npc_mcam_verify_channel(struct rvu *rvu, u16 pcifunc, u8 intf, u16 channel)
 	if (is_npc_intf_tx(intf))
 		return 0;
 
+	/* return in case of AF installed rules */
+	if (is_pffunc_af(pcifunc))
+		return 0;
+
 	if (is_afvf(pcifunc)) {
 		end = rvu_get_num_lbk_chans();
 		if (end < 0)
@@ -196,7 +196,7 @@ static int npc_get_ucast_mcam_index(struct npc_mcam *mcam, u16 pcifunc,
 	return mcam->nixlf_offset + (max + nixlf) * RSVD_MCAM_ENTRIES_PER_NIXLF;
 }
 
-static int npc_get_nixlf_mcam_index(struct npc_mcam *mcam,
+int npc_get_nixlf_mcam_index(struct npc_mcam *mcam,
 			     u16 pcifunc, int nixlf, int type)
 {
 	int pf = rvu_get_pf(pcifunc);
@@ -230,7 +230,7 @@ int npc_get_bank(struct npc_mcam *mcam, int index)
 	return bank;
 }
 
-static bool is_mcam_entry_enabled(struct rvu *rvu, struct npc_mcam *mcam,
+bool is_mcam_entry_enabled(struct rvu *rvu, struct npc_mcam *mcam,
 			   int blkaddr, int index)
 {
 	int bank = npc_get_bank(mcam, index);
@@ -1674,6 +1674,9 @@ void rvu_npc_get_mcam_counter_alloc_info(struct rvu *rvu, u16 pcifunc,
 static int npc_mcam_verify_entry(struct npc_mcam *mcam,
 				 u16 pcifunc, int entry)
 {
+	/* verify AF installed entries */
+	if (is_pffunc_af(pcifunc))
+		return 0;
 	/* Verify if entry is valid and if it is indeed
 	 * allocated to the requesting PFFUNC.
 	 */
@@ -2268,6 +2271,10 @@ int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
 		goto exit;
 	}
 
+	/* For AF installed rules, the nix_intf should be set to target NIX */
+	if (is_pffunc_af(req->hdr.pcifunc))
+		nix_intf = req->intf;
+
 	npc_config_mcam_entry(rvu, mcam, blkaddr, req->entry, nix_intf,
 			      &req->entry_data, req->enable_entry);
 
@@ -2730,30 +2737,6 @@ int rvu_mbox_handler_npc_get_kex_cfg(struct rvu *rvu, struct msg_req *req,
 	return 0;
 }
 
-bool rvu_npc_write_default_rule(struct rvu *rvu, int blkaddr, int nixlf,
-				u16 pcifunc, u8 intf, struct mcam_entry *entry,
-				int *index)
-{
-	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
-	struct npc_mcam *mcam = &rvu->hw->mcam;
-	bool enable;
-	u8 nix_intf;
-
-	if (is_npc_intf_tx(intf))
-		nix_intf = pfvf->nix_tx_intf;
-	else
-		nix_intf = pfvf->nix_rx_intf;
-
-	*index = npc_get_nixlf_mcam_index(mcam, pcifunc,
-					  nixlf, NIXLF_UCAST_ENTRY);
-	/* dont force enable unicast entry  */
-	enable = is_mcam_entry_enabled(rvu, mcam, blkaddr, *index);
-	npc_config_mcam_entry(rvu, mcam, blkaddr, *index, nix_intf,
-			      entry, enable);
-
-	return enable;
-}
-
 int rvu_mbox_handler_npc_read_base_steer_rule(struct rvu *rvu,
 					      struct msg_req *req,
 					      struct npc_mcam_read_base_rule_rsp *rsp)

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

@@ -998,33 +998,21 @@ static int npc_install_flow(struct rvu *rvu, int blkaddr, u16 target,
 	if (is_npc_intf_tx(req->intf))
 		goto find_rule;
 
-	if (def_ucast_rule)
+	if (req->default_rule) {
+		entry_index = npc_get_nixlf_mcam_index(mcam, target, nixlf,
+						       NIXLF_UCAST_ENTRY);
+		enable = is_mcam_entry_enabled(rvu, mcam, blkaddr, entry_index);
+	}
+
+	/* update mcam entry with default unicast rule attributes */
+	if (def_ucast_rule && (msg_from_vf || (req->default_rule && req->append))) {
 		missing_features = (def_ucast_rule->features ^ features) &
 					def_ucast_rule->features;
-
-	if (req->default_rule && req->append) {
-		/* add to default rule */
 		if (missing_features)
 			npc_update_flow(rvu, entry, missing_features,
 					&def_ucast_rule->packet,
 					&def_ucast_rule->mask,
 					&dummy, req->intf);
-		enable = rvu_npc_write_default_rule(rvu, blkaddr,
-						    nixlf, target,
-						    pfvf->nix_rx_intf, entry,
-						    &entry_index);
-		installed_features = req->features | missing_features;
-	} else if (req->default_rule && !req->append) {
-		/* overwrite default rule */
-		enable = rvu_npc_write_default_rule(rvu, blkaddr,
-						    nixlf, target,
-						    pfvf->nix_rx_intf, entry,
-						    &entry_index);
-	} else if (msg_from_vf) {
-		/* normal rule - include default rule also to it for VF */
-		npc_update_flow(rvu, entry, missing_features,
-				&def_ucast_rule->packet, &def_ucast_rule->mask,
-				&dummy, req->intf);
 		installed_features = req->features | missing_features;
 	}
 
@@ -1036,12 +1024,9 @@ find_rule:
 			return -ENOMEM;
 		new = true;
 	}
-	/* no counter for default rule */
-	if (req->default_rule)
-		goto update_rule;
 
 	/* allocate new counter if rule has no counter */
-	if (req->set_cntr && !rule->has_cntr)
+	if (!req->default_rule && req->set_cntr && !rule->has_cntr)
 		rvu_mcam_add_counter_to_rule(rvu, owner, rule, rsp);
 
 	/* if user wants to delete an existing counter for a rule then
@@ -1051,7 +1036,14 @@ find_rule:
 		rvu_mcam_remove_counter_from_rule(rvu, owner, rule);
 
 	write_req.hdr.pcifunc = owner;
-	write_req.entry = req->entry;
+
+	/* AF owns the default rules so change the owner just to relax
+	 * the checks in rvu_mbox_handler_npc_mcam_write_entry
+	 */
+	if (req->default_rule)
+		write_req.hdr.pcifunc = 0;
+
+	write_req.entry = entry_index;
 	write_req.intf = req->intf;
 	write_req.enable_entry = (u8)enable;
 	/* if counter is available then clear and use it */
@@ -1069,7 +1061,7 @@ find_rule:
 			kfree(rule);
 		return err;
 	}
-update_rule:
+	/* update rule */
 	memcpy(&rule->packet, &dummy.packet, sizeof(rule->packet));
 	memcpy(&rule->mask, &dummy.mask, sizeof(rule->mask));
 	rule->entry = entry_index;
@@ -1278,6 +1270,7 @@ static int npc_update_dmac_value(struct rvu *rvu, int npcblkaddr,
 
 	write_req.hdr.pcifunc = rule->owner;
 	write_req.entry = rule->entry;
+	write_req.intf = pfvf->nix_rx_intf;
 
 	mutex_unlock(&mcam->lock);
 	err = rvu_mbox_handler_npc_mcam_write_entry(rvu, &write_req, &rsp);