octeontx2-af: avoid RXC register access for CN10KB

This patch modifies the driver to prevent access to RXC hardware
registers on the CN10KB, as RXC is not available on this chip.
Signed-off-by: Srujana Challa <schalla@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -400,6 +400,7 @@ struct hw_cap {
 	bool	nix_multiple_dwrr_mtu;   /* Multiple DWRR_MTU to choose from */
 	bool	npc_hash_extract; /* Hash extract enabled ? */
 	bool	npc_exact_match_enabled; /* Exact match supported ? */
+	bool    cpt_rxc;   /* Is CPT-RXC supported */
 };
 
 struct rvu_hwinfo {
@@ -690,6 +691,15 @@ static inline bool is_cnf10ka_a0(struct rvu *rvu)
 	return false;
 }
 
+static inline bool is_cn10kb(struct rvu *rvu)
+{
+	struct pci_dev *pdev = rvu->pdev;
+
+	if (pdev->subsystem_device == PCI_SUBSYS_DEVID_CN10K_B)
+		return true;
+	return false;
+}
+
 static inline bool is_rvu_npc_hash_extract_en(struct rvu *rvu)
 {
 	u64 npc_const3;

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

@@ -789,6 +789,8 @@ int rvu_mbox_handler_cpt_rd_wr_register(struct rvu *rvu,
 
 static void get_ctx_pc(struct rvu *rvu, struct cpt_sts_rsp *rsp, int blkaddr)
 {
+	struct rvu_hwinfo *hw = rvu->hw;
+
 	if (is_rvu_otx2(rvu))
 		return;
 
@@ -812,14 +814,16 @@ static void get_ctx_pc(struct rvu *rvu, struct cpt_sts_rsp *rsp, int blkaddr)
 	rsp->ctx_err = rvu_read64(rvu, blkaddr, CPT_AF_CTX_ERR);
 	rsp->ctx_enc_id = rvu_read64(rvu, blkaddr, CPT_AF_CTX_ENC_ID);
 	rsp->ctx_flush_timer = rvu_read64(rvu, blkaddr, CPT_AF_CTX_FLUSH_TIMER);
+	rsp->x2p_link_cfg0 = rvu_read64(rvu, blkaddr, CPT_AF_X2PX_LINK_CFG(0));
+	rsp->x2p_link_cfg1 = rvu_read64(rvu, blkaddr, CPT_AF_X2PX_LINK_CFG(1));
 
+	if (!hw->cap.cpt_rxc)
+		return;
 	rsp->rxc_time = rvu_read64(rvu, blkaddr, CPT_AF_RXC_TIME);
 	rsp->rxc_time_cfg = rvu_read64(rvu, blkaddr, CPT_AF_RXC_TIME_CFG);
 	rsp->rxc_active_sts = rvu_read64(rvu, blkaddr, CPT_AF_RXC_ACTIVE_STS);
 	rsp->rxc_zombie_sts = rvu_read64(rvu, blkaddr, CPT_AF_RXC_ZOMBIE_STS);
 	rsp->rxc_dfrg = rvu_read64(rvu, blkaddr, CPT_AF_RXC_DFRG);
-	rsp->x2p_link_cfg0 = rvu_read64(rvu, blkaddr, CPT_AF_X2PX_LINK_CFG(0));
-	rsp->x2p_link_cfg1 = rvu_read64(rvu, blkaddr, CPT_AF_X2PX_LINK_CFG(1));
 }
 
 static void get_eng_sts(struct rvu *rvu, struct cpt_sts_rsp *rsp, int blkaddr)
@@ -1004,10 +1008,11 @@ int rvu_mbox_handler_cpt_flt_eng_info(struct rvu *rvu, struct cpt_flt_eng_info_r
 static void cpt_rxc_teardown(struct rvu *rvu, int blkaddr)
 {
 	struct cpt_rxc_time_cfg_req req, prev;
+	struct rvu_hwinfo *hw = rvu->hw;
 	int timeout = 2000;
 	u64 reg;
 
-	if (is_rvu_otx2(rvu))
+	if (!hw->cap.cpt_rxc)
 		return;
 
 	/* Set time limit to minimum values, so that rxc entries will be
@@ -1282,8 +1287,14 @@ int rvu_cpt_ctx_flush(struct rvu *rvu, u16 pcifunc)
 
 int rvu_cpt_init(struct rvu *rvu)
 {
+	struct rvu_hwinfo *hw = rvu->hw;
+
 	/* Retrieve CPT PF number */
 	rvu->cpt_pf_num = get_cpt_pf_num(rvu);
+	if (is_block_implemented(rvu->hw, BLKADDR_CPT0) && !is_rvu_otx2(rvu) &&
+	    !is_cn10kb(rvu))
+		hw->cap.cpt_rxc = true;
+
 	spin_lock_init(&rvu->cpt_intr_lock);
 
 	return 0;