octeontx2-pf: cleanup transmit link deriving logic

Unlike OcteonTx2, the channel numbers used by CGX/RPM
and LBK on CN10K silicons aren't fixed in HW. They are
SW programmable, hence we cannot derive transmit link
from static channel numbers anymore. Get the same from
admin function via mailbox.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
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

@@ -725,6 +725,7 @@ struct nix_lf_alloc_rsp {
 	u8	cgx_links;  /* No. of CGX links present in HW */
 	u8	lbk_links;  /* No. of LBK links present in HW */
 	u8	sdp_links;  /* No. of SDP links present in HW */
+	u8	tx_link;    /* Transmit channel link number */
 };
 
 struct nix_lf_free_req {

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

@@ -290,9 +290,11 @@ static bool is_valid_txschq(struct rvu *rvu, int blkaddr,
 	return true;
 }
 
-static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
+static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf,
+			      struct nix_lf_alloc_rsp *rsp)
 {
 	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct rvu_hwinfo *hw = rvu->hw;
 	struct mac_ops *mac_ops;
 	int pkind, pf, vf, lbkid;
 	u8 cgx_id, lmac_id;
@@ -317,6 +319,8 @@ static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 		pfvf->tx_chan_base = pfvf->rx_chan_base;
 		pfvf->rx_chan_cnt = 1;
 		pfvf->tx_chan_cnt = 1;
+		rsp->tx_link = cgx_id * hw->lmac_per_cgx + lmac_id;
+
 		cgx_set_pkind(rvu_cgx_pdata(cgx_id, rvu), lmac_id, pkind);
 		rvu_npc_set_pkind(rvu, pkind, pfvf);
 
@@ -350,6 +354,7 @@ static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 					rvu_nix_chan_lbk(rvu, lbkid, vf + 1);
 		pfvf->rx_chan_cnt = 1;
 		pfvf->tx_chan_cnt = 1;
+		rsp->tx_link = hw->cgx_links + lbkid;
 		rvu_npc_set_pkind(rvu, NPC_RX_LBK_PKIND, pfvf);
 		rvu_npc_install_promisc_entry(rvu, pcifunc, nixlf,
 					      pfvf->rx_chan_base,
@@ -1304,7 +1309,7 @@ int rvu_mbox_handler_nix_lf_alloc(struct rvu *rvu,
 	rvu_write64(rvu, blkaddr, NIX_AF_LFX_TX_PARSE_CFG(nixlf), cfg);
 
 	intf = is_afvf(pcifunc) ? NIX_INTF_TYPE_LBK : NIX_INTF_TYPE_CGX;
-	err = nix_interface_init(rvu, pcifunc, intf, nixlf);
+	err = nix_interface_init(rvu, pcifunc, intf, nixlf, rsp);
 	if (err)
 		goto free_mem;
 

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c

@@ -584,25 +584,6 @@ void otx2_get_mac_from_af(struct net_device *netdev)
 }
 EXPORT_SYMBOL(otx2_get_mac_from_af);
 
-static int otx2_get_link(struct otx2_nic *pfvf)
-{
-	int link = 0;
-	u16 map;
-
-	/* cgx lmac link */
-	if (pfvf->hw.tx_chan_base >= CGX_CHAN_BASE) {
-		map = pfvf->hw.tx_chan_base & 0x7FF;
-		link = 4 * ((map >> 8) & 0xF) + ((map >> 4) & 0xF);
-	}
-	/* LBK channel */
-	if (pfvf->hw.tx_chan_base < SDP_CHAN_BASE) {
-		map = pfvf->hw.tx_chan_base & 0x7FF;
-		link = pfvf->hw.cgx_links | ((map >> 8) & 0xF);
-	}
-
-	return link;
-}
-
 int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 {
 	struct otx2_hw *hw = &pfvf->hw;
@@ -661,8 +642,7 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
 		req->regval[1] = TXSCH_TL1_DFLT_RR_PRIO << 24 | dwrr_val;
 
 		req->num_regs++;
-		req->reg[2] = NIX_AF_TL3_TL2X_LINKX_CFG(schq,
-							otx2_get_link(pfvf));
+		req->reg[2] = NIX_AF_TL3_TL2X_LINKX_CFG(schq, hw->tx_link);
 		/* Enable this queue and backpressure */
 		req->regval[2] = BIT_ULL(13) | BIT_ULL(12);
 
@@ -1610,6 +1590,7 @@ void mbox_handler_nix_lf_alloc(struct otx2_nic *pfvf,
 	pfvf->hw.lso_tsov6_idx = rsp->lso_tsov6_idx;
 	pfvf->hw.cgx_links = rsp->cgx_links;
 	pfvf->hw.lbk_links = rsp->lbk_links;
+	pfvf->hw.tx_link = rsp->tx_link;
 }
 EXPORT_SYMBOL(mbox_handler_nix_lf_alloc);
 

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h

@@ -218,6 +218,7 @@ struct otx2_hw {
 	u64			cgx_fec_uncorr_blks;
 	u8			cgx_links;  /* No. of CGX links present in HW */
 	u8			lbk_links;  /* No. of LBK links present in HW */
+	u8			tx_link;    /* Transmit channel link number */
 #define HW_TSO			0
 #define CN10K_MBOX		1
 #define CN10K_LMTST		2