octeontx2-pf: cn10k: Map LMTST region

On CN10K platform transmit/receive buffer alloc and free from/to hardware
had changed to support burst operation. Whereas pervious silicon's only
support single buffer free at a time.
To Support the same firmware allocates a DRAM region for each PF/VF for
storing LMTLINES. These LMTLINES are used for NPA batch free and for
flushing SQE to the hardware.
PF/VF LMTST region is accessed via BAR4. PFs LMTST region is followed
by its VFs mbox memory. The size of region varies from 2KB to 256KB based
on number of LMTLINES configured.

This patch adds support for
- Mapping PF/VF LMTST region.
- Reserves 0-71 (RX + TX + XDP) LMTST lines for NPA batch
  free operation.
- Reserves 72-512 LMTST lines for NIX SQE flush.

Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 51 insertions, 1 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index e46d0d1c5782..afafaec88c8b 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -46,6 +46,39 @@ enum {
 static int otx2_config_hw_tx_tstamp(struct otx2_nic *pfvf, bool enable);
 static int otx2_config_hw_rx_tstamp(struct otx2_nic *pfvf, bool enable);
 
+static int cn10k_lmtst_init(struct otx2_nic *pf)
+{
+	int size, num_lines;
+	u64 base;
+
+	if (!test_bit(CN10K_LMTST, &pf->hw.cap_flag))
+		return 0;
+
+	base = pci_resource_start(pf->pdev, PCI_MBOX_BAR_NUM) +
+		       (MBOX_SIZE * (pf->total_vfs + 1));
+
+	size = pci_resource_len(pf->pdev, PCI_MBOX_BAR_NUM) -
+	       (MBOX_SIZE * (pf->total_vfs + 1));
+
+	pf->hw.lmt_base = ioremap(base, size);
+
+	if (!pf->hw.lmt_base) {
+		dev_err(pf->dev, "Unable to map PF LMTST region\n");
+		return -ENOMEM;
+	}
+
+	/* FIXME: Get the num of LMTST lines from LMT table */
+	pf->tot_lmt_lines = size / LMT_LINE_SIZE;
+	num_lines = (pf->tot_lmt_lines - NIX_LMTID_BASE) /
+			    pf->hw.tx_queues;
+	/* Number of LMT lines per SQ queues */
+	pf->nix_lmt_lines = num_lines > 32 ? 32 : num_lines;
+
+	pf->nix_lmt_size = pf->nix_lmt_lines * LMT_LINE_SIZE;
+
+	return 0;
+}
+
 static int otx2_change_mtu(struct net_device *netdev, int new_mtu)
 {
 	bool if_up = netif_running(netdev);
@@ -1498,6 +1531,14 @@ int otx2_open(struct net_device *netdev)
 	if (!qset->rq)
 		goto err_free_mem;
 
+	if (test_bit(CN10K_LMTST, &pf->hw.cap_flag)) {
+		/* Reserve LMT lines for NPA AURA batch free */
+		pf->hw.npa_lmt_base = (__force u64 *)pf->hw.lmt_base;
+		/* Reserve LMT lines for NIX TX */
+		pf->hw.nix_lmt_base = (__force u64 *)((u64)pf->hw.npa_lmt_base +
+				      (NIX_LMTID_BASE * LMT_LINE_SIZE));
+	}
+
 	err = otx2_init_hw_resources(pf);
 	if (err)
 		goto err_free_mem;
@@ -2336,6 +2377,8 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_free_netdev;
 	}
 
+	otx2_setup_dev_hw_settings(pf);
+
 	/* Init PF <=> AF mailbox stuff */
 	err = otx2_pfaf_mbox_init(pf);
 	if (err)
@@ -2361,7 +2404,9 @@ static int otx2_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (err)
 		goto err_detach_rsrc;
 
-	otx2_setup_dev_hw_settings(pf);
+	err = cn10k_lmtst_init(pf);
+	if (err)
+		goto err_detach_rsrc;
 
 	/* Assign default mac address */
 	otx2_get_mac_from_af(netdev);
@@ -2446,6 +2491,8 @@ err_del_mcam_entries:
 err_ptp_destroy:
 	otx2_ptp_destroy(pf);
 err_detach_rsrc:
+	if (hw->lmt_base)
+		iounmap(hw->lmt_base);
 	otx2_detach_resources(&pf->mbox);
 err_disable_mbox_intr:
 	otx2_disable_mbox_intr(pf);
@@ -2605,6 +2652,9 @@ static void otx2_remove(struct pci_dev *pdev)
 	otx2_ptp_destroy(pf);
 	otx2_mcam_flow_del(pf);
 	otx2_detach_resources(&pf->mbox);
+	if (pf->hw.lmt_base)
+		iounmap(pf->hw.lmt_base);
+
 	otx2_disable_mbox_intr(pf);
 	otx2_pfaf_mbox_destroy(pf);
 	pci_free_irq_vectors(pf->pdev);