octeontx2-af: MCAM entry installation support

Add support for a RVU PF/VF to enable, disable, configure
and shuffle MCAM entries via mbox commands. This patch adds
mailbox message formats and handling of these commands.

As of now otherthan validating MCAM entry index, info like
channel number e.t.c in MCAM config data sent by PF/VF are
not validated.

Also a max of 64 MCAM entries can be shuffled with a single
mbox command.
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

@@ -153,6 +153,14 @@ M(NPC_MCAM_ALLOC_ENTRY,	0x6000, npc_mcam_alloc_entry, npc_mcam_alloc_entry_req,\
 				npc_mcam_alloc_entry_rsp)		\
 M(NPC_MCAM_FREE_ENTRY,	0x6001, npc_mcam_free_entry,			\
 				 npc_mcam_free_entry_req, msg_rsp)	\
+M(NPC_MCAM_WRITE_ENTRY,	0x6002, npc_mcam_write_entry,			\
+				 npc_mcam_write_entry_req, msg_rsp)	\
+M(NPC_MCAM_ENA_ENTRY,   0x6003, npc_mcam_ena_entry,			\
+				 npc_mcam_ena_dis_entry_req, msg_rsp)	\
+M(NPC_MCAM_DIS_ENTRY,   0x6004, npc_mcam_dis_entry,			\
+				 npc_mcam_ena_dis_entry_req, msg_rsp)	\
+M(NPC_MCAM_SHIFT_ENTRY, 0x6005, npc_mcam_shift_entry, npc_mcam_shift_entry_req,\
+				npc_mcam_shift_entry_rsp)		\
 /* NIX mbox IDs (range 0x8000 - 0xFFFF) */				\
 M(NIX_LF_ALLOC,		0x8000, nix_lf_alloc,				\
 				 nix_lf_alloc_req, nix_lf_alloc_rsp)	\
@@ -590,4 +598,41 @@ struct npc_mcam_free_entry_req {
 	u8  all;   /* If all entries allocated to this PFVF to be freed */
 };
 
+struct mcam_entry {
+#define NPC_MAX_KWS_IN_KEY	7 /* Number of keywords in max keywidth */
+	u64	kw[NPC_MAX_KWS_IN_KEY];
+	u64	kw_mask[NPC_MAX_KWS_IN_KEY];
+	u64	action;
+	u64	vtag_action;
+};
+
+struct npc_mcam_write_entry_req {
+	struct mbox_msghdr hdr;
+	struct mcam_entry entry_data;
+	u16 entry;	 /* MCAM entry to write this match key */
+	u16 cntr;	 /* Counter for this MCAM entry */
+	u8  intf;	 /* Rx or Tx interface */
+	u8  enable_entry;/* Enable this MCAM entry ? */
+	u8  set_cntr;    /* Set counter for this entry ? */
+};
+
+/* Enable/Disable a given entry */
+struct npc_mcam_ena_dis_entry_req {
+	struct mbox_msghdr hdr;
+	u16 entry;
+};
+
+struct npc_mcam_shift_entry_req {
+	struct mbox_msghdr hdr;
+#define NPC_MCAM_MAX_SHIFTS	64
+	u16 curr_entry[NPC_MCAM_MAX_SHIFTS];
+	u16 new_entry[NPC_MCAM_MAX_SHIFTS];
+	u16 shift_count; /* Number of entries to shift */
+};
+
+struct npc_mcam_shift_entry_rsp {
+	struct mbox_msghdr hdr;
+	u16 failed_entry_idx; /* Index in 'curr_entry', not entry itself */
+};
+
 #endif /* MBOX_H */

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

@@ -386,4 +386,16 @@ int rvu_mbox_handler_npc_mcam_alloc_entry(struct rvu *rvu,
 int rvu_mbox_handler_npc_mcam_free_entry(struct rvu *rvu,
 					 struct npc_mcam_free_entry_req *req,
 					 struct msg_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
+					  struct npc_mcam_write_entry_req *req,
+					  struct msg_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_ena_entry(struct rvu *rvu,
+					struct npc_mcam_ena_dis_entry_req *req,
+					struct msg_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_dis_entry(struct rvu *rvu,
+					struct npc_mcam_ena_dis_entry_req *req,
+					struct msg_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_shift_entry(struct rvu *rvu,
+					  struct npc_mcam_shift_entry_req *req,
+					  struct npc_mcam_shift_entry_rsp *rsp);
 #endif /* RVU_H */

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

@@ -29,14 +29,6 @@
 static void npc_mcam_free_all_entries(struct rvu *rvu, struct npc_mcam *mcam,
 				      int blkaddr, u16 pcifunc);
 
-struct mcam_entry {
-#define NPC_MAX_KWS_IN_KEY	7 /* Number of keywords in max keywidth */
-	u64	kw[NPC_MAX_KWS_IN_KEY];
-	u64	kw_mask[NPC_MAX_KWS_IN_KEY];
-	u64	action;
-	u64	vtag_action;
-};
-
 void rvu_npc_set_pkind(struct rvu *rvu, int pkind, struct rvu_pfvf *pfvf)
 {
 	int blkaddr;
@@ -259,6 +251,46 @@ static void npc_config_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
 		npc_enable_mcam_entry(rvu, mcam, blkaddr, actindex, false);
 }
 
+static void npc_copy_mcam_entry(struct rvu *rvu, struct npc_mcam *mcam,
+				int blkaddr, u16 src, u16 dest)
+{
+	int dbank = npc_get_bank(mcam, dest);
+	int sbank = npc_get_bank(mcam, src);
+	u64 cfg, sreg, dreg;
+	int bank, i;
+
+	src &= (mcam->banksize - 1);
+	dest &= (mcam->banksize - 1);
+
+	/* Copy INTF's, W0's, W1's CAM0 and CAM1 configuration */
+	for (bank = 0; bank < mcam->banks_per_entry; bank++) {
+		sreg = NPC_AF_MCAMEX_BANKX_CAMX_INTF(src, sbank + bank, 0);
+		dreg = NPC_AF_MCAMEX_BANKX_CAMX_INTF(dest, dbank + bank, 0);
+		for (i = 0; i < 6; i++) {
+			cfg = rvu_read64(rvu, blkaddr, sreg + (i * 8));
+			rvu_write64(rvu, blkaddr, dreg + (i * 8), cfg);
+		}
+	}
+
+	/* Copy action */
+	cfg = rvu_read64(rvu, blkaddr,
+			 NPC_AF_MCAMEX_BANKX_ACTION(src, sbank));
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_ACTION(dest, dbank), cfg);
+
+	/* Copy TAG action */
+	cfg = rvu_read64(rvu, blkaddr,
+			 NPC_AF_MCAMEX_BANKX_TAG_ACT(src, sbank));
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_TAG_ACT(dest, dbank), cfg);
+
+	/* Enable or disable */
+	cfg = rvu_read64(rvu, blkaddr,
+			 NPC_AF_MCAMEX_BANKX_CFG(src, sbank));
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_CFG(dest, dbank), cfg);
+}
+
 static u64 npc_get_mcam_action(struct rvu *rvu, struct npc_mcam *mcam,
 			       int blkaddr, int index)
 {
@@ -1322,3 +1354,134 @@ int rvu_mbox_handler_npc_mcam_free_entry(struct rvu *rvu,
 	mutex_unlock(&mcam->lock);
 	return rc;
 }
+
+int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
+					  struct npc_mcam_write_entry_req *req,
+					  struct msg_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 pcifunc = req->hdr.pcifunc;
+	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_entry(mcam, pcifunc, req->entry);
+	if (rc)
+		goto exit;
+
+	if (req->intf != NIX_INTF_RX && req->intf != NIX_INTF_TX) {
+		rc = NPC_MCAM_INVALID_REQ;
+		goto exit;
+	}
+
+	npc_config_mcam_entry(rvu, mcam, blkaddr, req->entry, req->intf,
+			      &req->entry_data, req->enable_entry);
+
+	rc = 0;
+exit:
+	mutex_unlock(&mcam->lock);
+	return rc;
+}
+
+int rvu_mbox_handler_npc_mcam_ena_entry(struct rvu *rvu,
+					struct npc_mcam_ena_dis_entry_req *req,
+					struct msg_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 pcifunc = req->hdr.pcifunc;
+	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_entry(mcam, pcifunc, req->entry);
+	mutex_unlock(&mcam->lock);
+	if (rc)
+		return rc;
+
+	npc_enable_mcam_entry(rvu, mcam, blkaddr, req->entry, true);
+
+	return 0;
+}
+
+int rvu_mbox_handler_npc_mcam_dis_entry(struct rvu *rvu,
+					struct npc_mcam_ena_dis_entry_req *req,
+					struct msg_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 pcifunc = req->hdr.pcifunc;
+	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_entry(mcam, pcifunc, req->entry);
+	mutex_unlock(&mcam->lock);
+	if (rc)
+		return rc;
+
+	npc_enable_mcam_entry(rvu, mcam, blkaddr, req->entry, false);
+
+	return 0;
+}
+
+int rvu_mbox_handler_npc_mcam_shift_entry(struct rvu *rvu,
+					  struct npc_mcam_shift_entry_req *req,
+					  struct npc_mcam_shift_entry_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 pcifunc = req->hdr.pcifunc;
+	u16 old_entry, new_entry;
+	int blkaddr, rc;
+	u16 index;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return NPC_MCAM_INVALID_REQ;
+
+	if (req->shift_count > NPC_MCAM_MAX_SHIFTS)
+		return NPC_MCAM_INVALID_REQ;
+
+	mutex_lock(&mcam->lock);
+	for (index = 0; index < req->shift_count; index++) {
+		old_entry = req->curr_entry[index];
+		new_entry = req->new_entry[index];
+
+		/* Check if both old and new entries are valid and
+		 * does belong to this PFFUNC or not.
+		 */
+		rc = npc_mcam_verify_entry(mcam, pcifunc, old_entry);
+		if (rc)
+			break;
+
+		rc = npc_mcam_verify_entry(mcam, pcifunc, new_entry);
+		if (rc)
+			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);
+
+		/* 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);
+	}
+
+	/* If shift has failed then report the failed index */
+	if (index != req->shift_count) {
+		rc = NPC_MCAM_PERM_DENIED;
+		rsp->failed_entry_idx = index;
+	}
+
+	mutex_unlock(&mcam->lock);
+	return rc;
+}