octeontx2-pf: Calculate LBK link instead of hardcoding

CGX links are followed by LBK links but number of
CGX and LBK links varies between platforms. Hence
get the number of links present in hardware from
AF and use it to calculate LBK link number.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Rakesh Babu <rsaladi2@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -531,8 +531,10 @@ static int otx2_get_link(struct otx2_nic *pfvf)
 		link = 4 * ((map >> 8) & 0xF) + ((map >> 4) & 0xF);
 	}
 	/* LBK channel */
-	if (pfvf->hw.tx_chan_base < SDP_CHAN_BASE)
-		link = 12;
+	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;
 }
@@ -1503,6 +1505,8 @@ void mbox_handler_nix_lf_alloc(struct otx2_nic *pfvf,
 	pfvf->hw.tx_chan_base = rsp->tx_chan_base;
 	pfvf->hw.lso_tsov4_idx = rsp->lso_tsov4_idx;
 	pfvf->hw.lso_tsov6_idx = rsp->lso_tsov6_idx;
+	pfvf->hw.cgx_links = rsp->cgx_links;
+	pfvf->hw.lbk_links = rsp->lbk_links;
 }
 EXPORT_SYMBOL(mbox_handler_nix_lf_alloc);
 

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

@@ -197,6 +197,8 @@ struct otx2_hw {
 	struct otx2_drv_stats	drv_stats;
 	u64			cgx_rx_stats[CGX_RX_STATS_COUNT];
 	u64			cgx_tx_stats[CGX_TX_STATS_COUNT];
+	u8			cgx_links;  /* No. of CGX links present in HW */
+	u8			lbk_links;  /* No. of LBK links present in HW */
 };
 
 struct otx2_vf_config {