octeontx2-af: Map or unmap NPC MCAM entry and counter

Alloc memory to save MCAM 'entry to counter' mapping and since
multiple entries can map to same counter, added counter's reference
count tracking.

Do 'entry to counter' mapping when a entry is being installed
and mbox msg sender requested to configure a counter as well.
Mapping is removed when a entry or counter is being freed or
a explicit mbox msg is received to unmap them.
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -166,6 +166,8 @@ M(NPC_MCAM_ALLOC_COUNTER, 0x6006, npc_mcam_alloc_counter,		\
 					npc_mcam_alloc_counter_rsp)	\
 M(NPC_MCAM_FREE_COUNTER,  0x6007, npc_mcam_free_counter,		\
 				    npc_mcam_oper_counter_req, msg_rsp)	\
+M(NPC_MCAM_UNMAP_COUNTER, 0x6008, npc_mcam_unmap_counter,		\
+				   npc_mcam_unmap_counter_req, msg_rsp)	\
 M(NPC_MCAM_CLEAR_COUNTER, 0x6009, npc_mcam_clear_counter,		\
 				   npc_mcam_oper_counter_req, msg_rsp)	\
 M(NPC_MCAM_COUNTER_STATS, 0x600a, npc_mcam_counter_stats,		\
@@ -671,4 +673,11 @@ struct npc_mcam_oper_counter_rsp {
 	u64 stat;  /* valid only while fetching counter's stats */
 };
 
+struct npc_mcam_unmap_counter_req {
+	struct mbox_msghdr hdr;
+	u16 cntr;
+	u16 entry; /* Entry and counter to be unmapped */
+	u8  all;   /* Unmap all entries using this counter ? */
+};
+
 #endif /* MBOX_H */

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

@@ -81,7 +81,9 @@ struct npc_mcam {
 	u16	bmap_entries;	/* Number of unreserved MCAM entries */
 	u16	bmap_fcnt;	/* MCAM entries free count */
 	u16	*entry2pfvf_map;
+	u16	*entry2cntr_map;
 	u16	*cntr2pfvf_map;
+	u16	*cntr_refcnt;
 	u8	keysize;	/* MCAM keysize 112/224/448 bits */
 	u8	banks;		/* Number of MCAM banks */
 	u8	banks_per_entry;/* Number of keywords in key */
@@ -405,6 +407,8 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
 		   struct npc_mcam_oper_counter_req *req, struct msg_rsp *rsp);
 int rvu_mbox_handler_npc_mcam_clear_counter(struct rvu *rvu,
 		struct npc_mcam_oper_counter_req *req, struct msg_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_unmap_counter(struct rvu *rvu,
+		struct npc_mcam_unmap_counter_req *req, struct msg_rsp *rsp);
 int rvu_mbox_handler_npc_mcam_counter_stats(struct rvu *rvu,
 			struct npc_mcam_oper_counter_req *req,
 			struct npc_mcam_oper_counter_rsp *rsp);

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

@@ -28,6 +28,8 @@
 
 static void npc_mcam_free_all_entries(struct rvu *rvu, struct npc_mcam *mcam,
 				      int blkaddr, u16 pcifunc);
+static void npc_mcam_free_all_counters(struct rvu *rvu, struct npc_mcam *mcam,
+				       u16 pcifunc);
 
 void rvu_npc_set_pkind(struct rvu *rvu, int pkind, struct rvu_pfvf *pfvf)
 {
@@ -506,6 +508,9 @@ void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
 	/* Disable and free all MCAM entries mapped to this 'pcifunc' */
 	npc_mcam_free_all_entries(rvu, mcam, blkaddr, pcifunc);
 
+	/* Free all MCAM counters mapped to this 'pcifunc' */
+	npc_mcam_free_all_counters(rvu, mcam, pcifunc);
+
 	mutex_unlock(&mcam->lock);
 
 	/* Disable ucast MCAM match entry of this PF/VF */
@@ -819,6 +824,19 @@ static int npc_mcam_rsrcs_init(struct rvu *rvu, int blkaddr)
 	if (!mcam->cntr2pfvf_map)
 		goto free_mem;
 
+	/* Alloc memory for MCAM entry to counter mapping and for tracking
+	 * counter's reference count.
+	 */
+	mcam->entry2cntr_map = devm_kcalloc(rvu->dev, mcam->bmap_entries,
+					    sizeof(u16), GFP_KERNEL);
+	if (!mcam->entry2cntr_map)
+		goto free_mem;
+
+	mcam->cntr_refcnt = devm_kcalloc(rvu->dev, mcam->counters.max,
+					 sizeof(u16), GFP_KERNEL);
+	if (!mcam->cntr_refcnt)
+		goto free_mem;
+
 	mutex_init(&mcam->lock);
 
 	return 0;
@@ -948,6 +966,36 @@ static int npc_mcam_verify_counter(struct npc_mcam *mcam,
 	return 0;
 }
 
+static void npc_map_mcam_entry_and_cntr(struct rvu *rvu, struct npc_mcam *mcam,
+					int blkaddr, u16 entry, u16 cntr)
+{
+	u16 index = entry & (mcam->banksize - 1);
+	u16 bank = npc_get_bank(mcam, entry);
+
+	/* Set mapping and increment counter's refcnt */
+	mcam->entry2cntr_map[entry] = cntr;
+	mcam->cntr_refcnt[cntr]++;
+	/* Enable stats */
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_STAT_ACT(index, bank),
+		    BIT_ULL(9) | cntr);
+}
+
+static void npc_unmap_mcam_entry_and_cntr(struct rvu *rvu,
+					  struct npc_mcam *mcam,
+					  int blkaddr, u16 entry, u16 cntr)
+{
+	u16 index = entry & (mcam->banksize - 1);
+	u16 bank = npc_get_bank(mcam, entry);
+
+	/* Remove mapping and reduce counter's refcnt */
+	mcam->entry2cntr_map[entry] = NPC_MCAM_INVALID_MAP;
+	mcam->cntr_refcnt[cntr]--;
+	/* Disable stats */
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_STAT_ACT(index, bank), 0x00);
+}
+
 /* Sets MCAM entry in bitmap as used. Update
  * reverse bitmap too. Should be called with
  * 'mcam->lock' held.
@@ -983,7 +1031,7 @@ static void npc_mcam_clear_bit(struct npc_mcam *mcam, u16 index)
 static void npc_mcam_free_all_entries(struct rvu *rvu, struct npc_mcam *mcam,
 				      int blkaddr, u16 pcifunc)
 {
-	u16 index;
+	u16 index, cntr;
 
 	/* Scan all MCAM entries and free the ones mapped to 'pcifunc' */
 	for (index = 0; index < mcam->bmap_entries; index++) {
@@ -993,6 +1041,33 @@ static void npc_mcam_free_all_entries(struct rvu *rvu, struct npc_mcam *mcam,
 			npc_mcam_clear_bit(mcam, index);
 			/* Disable the entry */
 			npc_enable_mcam_entry(rvu, mcam, blkaddr, index, false);
+
+			/* Update entry2counter mapping */
+			cntr = mcam->entry2cntr_map[index];
+			if (cntr != NPC_MCAM_INVALID_MAP)
+				npc_unmap_mcam_entry_and_cntr(rvu, mcam,
+							      blkaddr, index,
+							      cntr);
+		}
+	}
+}
+
+static void npc_mcam_free_all_counters(struct rvu *rvu, struct npc_mcam *mcam,
+				       u16 pcifunc)
+{
+	u16 cntr;
+
+	/* Scan all MCAM counters and free the ones mapped to 'pcifunc' */
+	for (cntr = 0; cntr < mcam->counters.max; cntr++) {
+		if (mcam->cntr2pfvf_map[cntr] == pcifunc) {
+			mcam->cntr2pfvf_map[cntr] = NPC_MCAM_INVALID_MAP;
+			mcam->cntr_refcnt[cntr] = 0;
+			rvu_free_rsrc(&mcam->counters, cntr);
+			/* This API is expected to be called after freeing
+			 * MCAM entries, which inturn will remove
+			 * 'entry to counter' mapping.
+			 * No need to do it again.
+			 */
 		}
 	}
 }
@@ -1282,6 +1357,7 @@ static int npc_mcam_alloc_entries(struct npc_mcam *mcam, u16 pcifunc,
 			(rsp->entry + entry) : rsp->entry_list[entry];
 		npc_mcam_set_bit(mcam, index);
 		mcam->entry2pfvf_map[index] = pcifunc;
+		mcam->entry2cntr_map[index] = NPC_MCAM_INVALID_MAP;
 	}
 
 	/* Update available free count in mbox response */
@@ -1338,6 +1414,7 @@ int rvu_mbox_handler_npc_mcam_free_entry(struct rvu *rvu,
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	u16 pcifunc = req->hdr.pcifunc;
 	int blkaddr, rc = 0;
+	u16 cntr;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0)
@@ -1360,6 +1437,12 @@ int rvu_mbox_handler_npc_mcam_free_entry(struct rvu *rvu,
 	npc_mcam_clear_bit(mcam, req->entry);
 	npc_enable_mcam_entry(rvu, mcam, blkaddr, req->entry, false);
 
+	/* Update entry2counter mapping */
+	cntr = mcam->entry2cntr_map[req->entry];
+	if (cntr != NPC_MCAM_INVALID_MAP)
+		npc_unmap_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+					      req->entry, cntr);
+
 	goto exit;
 
 free_all:
@@ -1387,6 +1470,12 @@ int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
 	if (rc)
 		goto exit;
 
+	if (req->set_cntr &&
+	    npc_mcam_verify_counter(mcam, pcifunc, req->cntr)) {
+		rc = NPC_MCAM_INVALID_REQ;
+		goto exit;
+	}
+
 	if (req->intf != NIX_INTF_RX && req->intf != NIX_INTF_TX) {
 		rc = NPC_MCAM_INVALID_REQ;
 		goto exit;
@@ -1395,6 +1484,10 @@ int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
 	npc_config_mcam_entry(rvu, mcam, blkaddr, req->entry, req->intf,
 			      &req->entry_data, req->enable_entry);
 
+	if (req->set_cntr)
+		npc_map_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+					    req->entry, req->cntr);
+
 	rc = 0;
 exit:
 	mutex_unlock(&mcam->lock);
@@ -1454,8 +1547,8 @@ int rvu_mbox_handler_npc_mcam_shift_entry(struct rvu *rvu,
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	u16 pcifunc = req->hdr.pcifunc;
 	u16 old_entry, new_entry;
+	u16 index, cntr;
 	int blkaddr, rc;
-	u16 index;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0)
@@ -1480,12 +1573,27 @@ int rvu_mbox_handler_npc_mcam_shift_entry(struct rvu *rvu,
 		if (rc)
 			break;
 
+		/* new_entry should not have a counter mapped */
+		if (mcam->entry2cntr_map[new_entry] != NPC_MCAM_INVALID_MAP) {
+			rc = NPC_MCAM_PERM_DENIED;
+			break;
+		}
+
 		/* Disable the new_entry */
 		npc_enable_mcam_entry(rvu, mcam, blkaddr, new_entry, false);
 
 		/* Copy rule from old entry to new entry */
 		npc_copy_mcam_entry(rvu, mcam, blkaddr, old_entry, new_entry);
 
+		/* Copy counter mapping, if any */
+		cntr = mcam->entry2cntr_map[old_entry];
+		if (cntr != NPC_MCAM_INVALID_MAP) {
+			npc_unmap_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+						      old_entry, cntr);
+			npc_map_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+						    new_entry, cntr);
+		}
+
 		/* Enable new_entry and disable old_entry */
 		npc_enable_mcam_entry(rvu, mcam, blkaddr, new_entry, true);
 		npc_enable_mcam_entry(rvu, mcam, blkaddr, old_entry, false);
@@ -1569,7 +1677,12 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
 		struct npc_mcam_oper_counter_req *req, struct msg_rsp *rsp)
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;
-	int err;
+	u16 index, entry = 0;
+	int blkaddr, err;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return NPC_MCAM_INVALID_REQ;
 
 	mutex_lock(&mcam->lock);
 	err = npc_mcam_verify_counter(mcam, req->hdr.pcifunc, req->cntr);
@@ -1581,11 +1694,73 @@ int rvu_mbox_handler_npc_mcam_free_counter(struct rvu *rvu,
 	/* Mark counter as free/unused */
 	mcam->cntr2pfvf_map[req->cntr] = NPC_MCAM_INVALID_MAP;
 	rvu_free_rsrc(&mcam->counters, req->cntr);
-	mutex_unlock(&mcam->lock);
 
+	/* Disable all MCAM entry's stats which are using this counter */
+	while (entry < mcam->bmap_entries) {
+		if (!mcam->cntr_refcnt[req->cntr])
+			break;
+
+		index = find_next_bit(mcam->bmap, mcam->bmap_entries, entry);
+		if (index >= mcam->bmap_entries)
+			break;
+		if (mcam->entry2cntr_map[index] != req->cntr)
+			continue;
+
+		entry = index + 1;
+		npc_unmap_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+					      index, req->cntr);
+	}
+
+	mutex_unlock(&mcam->lock);
 	return 0;
 }
 
+int rvu_mbox_handler_npc_mcam_unmap_counter(struct rvu *rvu,
+		struct npc_mcam_unmap_counter_req *req, struct msg_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 index, entry = 0;
+	int blkaddr, rc;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return NPC_MCAM_INVALID_REQ;
+
+	mutex_lock(&mcam->lock);
+	rc = npc_mcam_verify_counter(mcam, req->hdr.pcifunc, req->cntr);
+	if (rc)
+		goto exit;
+
+	/* Unmap the MCAM entry and counter */
+	if (!req->all) {
+		rc = npc_mcam_verify_entry(mcam, req->hdr.pcifunc, req->entry);
+		if (rc)
+			goto exit;
+		npc_unmap_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+					      req->entry, req->cntr);
+		goto exit;
+	}
+
+	/* Disable all MCAM entry's stats which are using this counter */
+	while (entry < mcam->bmap_entries) {
+		if (!mcam->cntr_refcnt[req->cntr])
+			break;
+
+		index = find_next_bit(mcam->bmap, mcam->bmap_entries, entry);
+		if (index >= mcam->bmap_entries)
+			break;
+		if (mcam->entry2cntr_map[index] != req->cntr)
+			continue;
+
+		entry = index + 1;
+		npc_unmap_mcam_entry_and_cntr(rvu, mcam, blkaddr,
+					      index, req->cntr);
+	}
+exit:
+	mutex_unlock(&mcam->lock);
+	return rc;
+}
+
 int rvu_mbox_handler_npc_mcam_clear_counter(struct rvu *rvu,
 		struct npc_mcam_oper_counter_req *req, struct msg_rsp *rsp)
 {