octeontx2-af: NPC MCAM entry alloc/free support

This patch adds NPC MCAM entry management and support for
allocating and freeing them via mailbox. Both contiguous and
non-contiguous allocations are supported. Incase of contiguous,
if request cannot be met then max contiguous number of available
entries are allocated.

High or low priority index allocation w.r.t a reference MCAM index
is also supported.

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

@@ -149,6 +149,10 @@ M(NPA_HWCTX_DISABLE,	0x403, npa_hwctx_disable, hwctx_disable_req, msg_rsp)\
 /* TIM mbox IDs (range 0x800 - 0x9FF) */				\
 /* CPT mbox IDs (range 0xA00 - 0xBFF) */				\
 /* NPC mbox IDs (range 0x6000 - 0x7FFF) */				\
+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)	\
 /* NIX mbox IDs (range 0x8000 - 0xFFFF) */				\
 M(NIX_LF_ALLOC,		0x8000, nix_lf_alloc,				\
 				 nix_lf_alloc_req, nix_lf_alloc_rsp)	\
@@ -353,6 +357,8 @@ struct hwctx_disable_req {
 	u8 ctype;
 };
 
+/* NIX mbox message formats */
+
 /* NIX mailbox error codes
  * Range 401 - 500.
  */
@@ -541,4 +547,47 @@ struct nix_frs_cfg {
 	u16	minlen;
 };
 
+/* NPC mbox message structs */
+
+#define NPC_MCAM_ENTRY_INVALID	0xFFFF
+#define NPC_MCAM_INVALID_MAP	0xFFFF
+
+/* NPC mailbox error codes
+ * Range 701 - 800.
+ */
+enum npc_af_status {
+	NPC_MCAM_INVALID_REQ	= -701,
+	NPC_MCAM_ALLOC_DENIED	= -702,
+	NPC_MCAM_ALLOC_FAILED	= -703,
+	NPC_MCAM_PERM_DENIED	= -704,
+};
+
+struct npc_mcam_alloc_entry_req {
+	struct mbox_msghdr hdr;
+#define NPC_MAX_NONCONTIG_ENTRIES	256
+	u8  contig;   /* Contiguous entries ? */
+#define NPC_MCAM_ANY_PRIO		0
+#define NPC_MCAM_LOWER_PRIO		1
+#define NPC_MCAM_HIGHER_PRIO		2
+	u8  priority; /* Lower or higher w.r.t ref_entry */
+	u16 ref_entry;
+	u16 count;    /* Number of entries requested */
+};
+
+struct npc_mcam_alloc_entry_rsp {
+	struct mbox_msghdr hdr;
+	u16 entry; /* Entry allocated or start index if contiguous.
+		    * Invalid incase of non-contiguous.
+		    */
+	u16 count; /* Number of entries allocated */
+	u16 free_count; /* Number of entries available */
+	u16 entry_list[NPC_MAX_NONCONTIG_ENTRIES];
+};
+
+struct npc_mcam_free_entry_req {
+	struct mbox_msghdr hdr;
+	u16 entry; /* Entry index to be freed */
+	u8  all;   /* If all entries allocated to this PFVF to be freed */
+};
+
 #endif /* MBOX_H */

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

@@ -74,15 +74,25 @@ struct nix_mce_list {
 };
 
 struct npc_mcam {
+	struct rsrc_bmap counters;
 	struct mutex	lock;	/* MCAM entries and counters update lock */
+	unsigned long	*bmap;		/* bitmap, 0 => bmap_entries */
+	unsigned long	*bmap_reverse;	/* Reverse bitmap, bmap_entries => 0 */
+	u16	bmap_entries;	/* Number of unreserved MCAM entries */
+	u16	bmap_fcnt;	/* MCAM entries free count */
+	u16	*entry2pfvf_map;
+	u16	*cntr2pfvf_map;
 	u8	keysize;	/* MCAM keysize 112/224/448 bits */
 	u8	banks;		/* Number of MCAM banks */
 	u8	banks_per_entry;/* Number of keywords in key */
 	u16	banksize;	/* Number of MCAM entries in each bank */
 	u16	total_entries;	/* Total number of MCAM entries */
-	u16     entries;	/* Total minus reserved for NIX LFs */
 	u16	nixlf_offset;	/* Offset of nixlf rsvd uncast entries */
 	u16	pf_offset;	/* Offset of PF's rsvd bcast, promisc entries */
+	u16	lprio_count;
+	u16	lprio_start;
+	u16	hprio_count;
+	u16	hprio_end;
 };
 
 /* Structure for per RVU func info ie PF/VF */
@@ -315,6 +325,7 @@ int rvu_mbox_handler_npa_lf_free(struct rvu *rvu, struct msg_req *req,
 				 struct msg_rsp *rsp);
 
 /* NIX APIs */
+bool is_nixlf_attached(struct rvu *rvu, u16 pcifunc);
 int rvu_nix_init(struct rvu *rvu);
 void rvu_nix_freemem(struct rvu *rvu);
 int rvu_get_nixlf_count(struct rvu *rvu);
@@ -369,4 +380,10 @@ void rvu_npc_install_bcast_match_entry(struct rvu *rvu, u16 pcifunc,
 void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
 void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
 				    int group, int alg_idx, int mcam_index);
+int rvu_mbox_handler_npc_mcam_alloc_entry(struct rvu *rvu,
+					  struct npc_mcam_alloc_entry_req *req,
+					  struct npc_mcam_alloc_entry_rsp *rsp);
+int rvu_mbox_handler_npc_mcam_free_entry(struct rvu *rvu,
+					 struct npc_mcam_free_entry_req *req,
+					 struct msg_rsp *rsp);
 #endif /* RVU_H */

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

@@ -55,6 +55,17 @@ struct mce {
 	u16			pcifunc;
 };
 
+bool is_nixlf_attached(struct rvu *rvu, u16 pcifunc)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	int blkaddr;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
+	if (!pfvf->nixlf || blkaddr < 0)
+		return false;
+	return true;
+}
+
 int rvu_get_nixlf_count(struct rvu *rvu)
 {
 	struct rvu_block *block;