octeontx2-pf: add tc flower stats handler for hw offloads

Add support to get the stats for tc flower flows that are
offloaded to hardware. To support this feature, added a
new AF mbox handler which returns the MCAM entry stats
for a flow that has hardware stat counter enabled.

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

2 files changed, 53 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index 46f919625464..3af4d0ffcf7c 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -216,6 +216,9 @@ M(NPC_MCAM_READ_ENTRY,	  0x600f, npc_mcam_read_entry,			\
 				  npc_mcam_read_entry_rsp)		\
 M(NPC_MCAM_READ_BASE_RULE, 0x6011, npc_read_base_steer_rule,            \
 				   msg_req, npc_mcam_read_base_rule_rsp)  \
+M(NPC_MCAM_GET_STATS, 0x6012, npc_mcam_entry_stats,                     \
+				   npc_mcam_get_stats_req,              \
+				   npc_mcam_get_stats_rsp)              \
 /* NIX mbox IDs (range 0x8000 - 0xFFFF) */				\
 M(NIX_LF_ALLOC,		0x8000, nix_lf_alloc,				\
 				 nix_lf_alloc_req, nix_lf_alloc_rsp)	\
@@ -1195,6 +1198,17 @@ struct npc_mcam_read_base_rule_rsp {
 	struct mcam_entry entry;
 };
 
+struct npc_mcam_get_stats_req {
+	struct mbox_msghdr hdr;
+	u16 entry; /* mcam entry */
+};
+
+struct npc_mcam_get_stats_rsp {
+	struct mbox_msghdr hdr;
+	u64 stat;  /* counter stats */
+	u8 stat_ena; /* enabled */
+};
+
 enum ptp_op {
 	PTP_OP_ADJFINE = 0,
 	PTP_OP_GET_CLOCK = 1,
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
index 6cce7ecad007..03248d280e47 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
@@ -2806,3 +2806,42 @@ read_entry:
 out:
 	return rc;
 }
+
+int rvu_mbox_handler_npc_mcam_entry_stats(struct rvu *rvu,
+					  struct npc_mcam_get_stats_req *req,
+					  struct npc_mcam_get_stats_rsp *rsp)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	u16 index, cntr;
+	int blkaddr;
+	u64 regval;
+	u32 bank;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return NPC_MCAM_INVALID_REQ;
+
+	mutex_lock(&mcam->lock);
+
+	index = req->entry & (mcam->banksize - 1);
+	bank = npc_get_bank(mcam, req->entry);
+
+	/* read MCAM entry STAT_ACT register */
+	regval = rvu_read64(rvu, blkaddr, NPC_AF_MCAMEX_BANKX_STAT_ACT(index, bank));
+
+	if (!(regval & BIT_ULL(9))) {
+		rsp->stat_ena = 0;
+		mutex_unlock(&mcam->lock);
+		return 0;
+	}
+
+	cntr = regval & 0x1FF;
+
+	rsp->stat_ena = 1;
+	rsp->stat = rvu_read64(rvu, blkaddr, NPC_AF_MATCH_STATX(cntr));
+	rsp->stat &= BIT_ULL(48) - 1;
+
+	mutex_unlock(&mcam->lock);
+
+	return 0;
+}