octeontx2-af: cn10k: Add mailbox to configure reassembly timeout

CN10K CPT coprocessor includes a component named RXC which
is responsible for reassembly of inner IP packets. RXC has
the feature to evict oldest entries based on age/threshold.
This patch adds a new mailbox to configure reassembly age
or threshold.
Signed-off-by: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Signed-off-by: Srujana Challa <schalla@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -177,6 +177,8 @@ M(CPT_LF_ALLOC,		0xA00, cpt_lf_alloc, cpt_lf_alloc_req_msg,	\
 M(CPT_LF_FREE,		0xA01, cpt_lf_free, msg_req, msg_rsp)		\
 M(CPT_RD_WR_REGISTER,	0xA02, cpt_rd_wr_register,  cpt_rd_wr_reg_msg,	\
 			       cpt_rd_wr_reg_msg)			\
+M(CPT_RXC_TIME_CFG,     0xA06, cpt_rxc_time_cfg, cpt_rxc_time_cfg_req,  \
+			       msg_rsp)                                 \
 /* 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)		\
@@ -1255,4 +1257,15 @@ struct cpt_lf_alloc_req_msg {
 	int blkaddr;
 };
 
+/* Mailbox message request format to configure reassembly timeout. */
+struct cpt_rxc_time_cfg_req {
+	struct mbox_msghdr hdr;
+	int blkaddr;
+	u32 step;
+	u16 zombie_thres;
+	u16 zombie_limit;
+	u16 active_thres;
+	u16 active_limit;
+};
+
 #endif /* MBOX_H */

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

 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (C) 2020 Marvell. */
 
+#include <linux/bitfield.h>
 #include <linux/pci.h>
 #include "rvu_struct.h"
 #include "rvu_reg.h"
@@ -60,6 +61,17 @@ static bool is_cpt_vf(struct rvu *rvu, u16 pcifunc)
 	return true;
 }
 
+static int validate_and_get_cpt_blkaddr(int req_blkaddr)
+{
+	int blkaddr;
+
+	blkaddr = req_blkaddr ? req_blkaddr : BLKADDR_CPT0;
+	if (blkaddr != BLKADDR_CPT0 && blkaddr != BLKADDR_CPT1)
+		return -EINVAL;
+
+	return blkaddr;
+}
+
 int rvu_mbox_handler_cpt_lf_alloc(struct rvu *rvu,
 				  struct cpt_lf_alloc_req_msg *req,
 				  struct msg_rsp *rsp)
@@ -70,9 +82,9 @@ int rvu_mbox_handler_cpt_lf_alloc(struct rvu *rvu,
 	int num_lfs, slot;
 	u64 val;
 
-	blkaddr = req->blkaddr ? req->blkaddr : BLKADDR_CPT0;
-	if (blkaddr != BLKADDR_CPT0 && blkaddr != BLKADDR_CPT1)
-		return -ENODEV;
+	blkaddr = validate_and_get_cpt_blkaddr(req->blkaddr);
+	if (blkaddr < 0)
+		return blkaddr;
 
 	if (req->eng_grpmsk == 0x0)
 		return CPT_AF_ERR_GRP_INVALID;
@@ -170,7 +182,9 @@ static bool is_valid_offset(struct rvu *rvu, struct cpt_rd_wr_reg_msg *req)
 	struct rvu_block *block;
 	struct rvu_pfvf *pfvf;
 
-	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_CPT, 0);
+	blkaddr = validate_and_get_cpt_blkaddr(req->blkaddr);
+	if (blkaddr < 0)
+		return blkaddr;
 
 	/* Registers that can be accessed from PF/VF */
 	if ((offset & 0xFF000) ==  CPT_AF_LFX_CTL(0) ||
@@ -226,9 +240,9 @@ int rvu_mbox_handler_cpt_rd_wr_register(struct rvu *rvu,
 {
 	int blkaddr;
 
-	blkaddr = req->blkaddr ? req->blkaddr : BLKADDR_CPT0;
-	if (blkaddr != BLKADDR_CPT0 && blkaddr != BLKADDR_CPT1)
-		return -ENODEV;
+	blkaddr = validate_and_get_cpt_blkaddr(req->blkaddr);
+	if (blkaddr < 0)
+		return blkaddr;
 
 	/* This message is accepted only if sent from CPT PF/VF */
 	if (!is_cpt_pf(rvu, req->hdr.pcifunc) &&
@@ -250,6 +264,47 @@ int rvu_mbox_handler_cpt_rd_wr_register(struct rvu *rvu,
 	return 0;
 }
 
+#define RXC_ZOMBIE_THRES  GENMASK_ULL(59, 48)
+#define RXC_ZOMBIE_LIMIT  GENMASK_ULL(43, 32)
+#define RXC_ACTIVE_THRES  GENMASK_ULL(27, 16)
+#define RXC_ACTIVE_LIMIT  GENMASK_ULL(11, 0)
+#define RXC_ACTIVE_COUNT  GENMASK_ULL(60, 48)
+#define RXC_ZOMBIE_COUNT  GENMASK_ULL(60, 48)
+
+static void cpt_rxc_time_cfg(struct rvu *rvu, struct cpt_rxc_time_cfg_req *req,
+			     int blkaddr)
+{
+	u64 dfrg_reg;
+
+	dfrg_reg = FIELD_PREP(RXC_ZOMBIE_THRES, req->zombie_thres);
+	dfrg_reg |= FIELD_PREP(RXC_ZOMBIE_LIMIT, req->zombie_limit);
+	dfrg_reg |= FIELD_PREP(RXC_ACTIVE_THRES, req->active_thres);
+	dfrg_reg |= FIELD_PREP(RXC_ACTIVE_LIMIT, req->active_limit);
+
+	rvu_write64(rvu, blkaddr, CPT_AF_RXC_TIME_CFG, req->step);
+	rvu_write64(rvu, blkaddr, CPT_AF_RXC_DFRG, dfrg_reg);
+}
+
+int rvu_mbox_handler_cpt_rxc_time_cfg(struct rvu *rvu,
+				      struct cpt_rxc_time_cfg_req *req,
+				      struct msg_rsp *rsp)
+{
+	int blkaddr;
+
+	blkaddr = validate_and_get_cpt_blkaddr(req->blkaddr);
+	if (blkaddr < 0)
+		return blkaddr;
+
+	/* This message is accepted only if sent from CPT PF/VF */
+	if (!is_cpt_pf(rvu, req->hdr.pcifunc) &&
+	    !is_cpt_vf(rvu, req->hdr.pcifunc))
+		return CPT_AF_ERR_ACCESS_DENIED;
+
+	cpt_rxc_time_cfg(rvu, req, blkaddr);
+
+	return 0;
+}
+
 #define INPROG_INFLIGHT(reg)    ((reg) & 0x1FF)
 #define INPROG_GRB_PARTIAL(reg) ((reg) & BIT_ULL(31))
 #define INPROG_GRB(reg)         (((reg) >> 32) & 0xFF)