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, 35 insertions, 2 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index e7d8fef4f53d..9ed850b75d59 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -27,6 +27,31 @@ enum {
 	RVU_VF_INT_VEC_MBOX = 0x0,
 };
 
+static int cn10k_lmtst_init(struct otx2_nic *vf)
+{
+	int size, num_lines;
+
+	if (!test_bit(CN10K_LMTST, &vf->hw.cap_flag))
+		return 0;
+
+	size = pci_resource_len(vf->pdev, PCI_MBOX_BAR_NUM);
+	vf->hw.lmt_base = ioremap_wc(pci_resource_start(vf->pdev,
+							PCI_MBOX_BAR_NUM),
+				     size);
+	if (!vf->hw.lmt_base) {
+		dev_err(vf->dev, "Unable to map VF LMTST region\n");
+		return -ENOMEM;
+	}
+
+	vf->tot_lmt_lines = size / LMT_LINE_SIZE;
+	/* LMTST lines per SQ */
+	num_lines = (vf->tot_lmt_lines - NIX_LMTID_BASE) /
+			    vf->hw.tx_queues;
+	vf->nix_lmt_lines = num_lines > 32 ? 32 : num_lines;
+	vf->nix_lmt_size = vf->nix_lmt_lines * LMT_LINE_SIZE;
+	return 0;
+}
+
 static void otx2vf_process_vfaf_mbox_msg(struct otx2_nic *vf,
 					 struct mbox_msghdr *msg)
 {
@@ -536,6 +561,7 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto err_free_irq_vectors;
 	}
 
+	otx2_setup_dev_hw_settings(vf);
 	/* Init VF <=> PF mailbox stuff */
 	err = otx2vf_vfaf_mbox_init(vf);
 	if (err)
@@ -559,7 +585,9 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (err)
 		goto err_detach_rsrc;
 
-	otx2_setup_dev_hw_settings(vf);
+	err = cn10k_lmtst_init(vf);
+	if (err)
+		goto err_detach_rsrc;
 
 	/* Assign default mac address */
 	otx2_get_mac_from_af(netdev);
@@ -611,6 +639,8 @@ static int otx2vf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	return 0;
 
 err_detach_rsrc:
+	if (hw->lmt_base)
+		iounmap(hw->lmt_base);
 	otx2_detach_resources(&vf->mbox);
 err_disable_mbox_intr:
 	otx2vf_disable_mbox_intr(vf);
@@ -639,8 +669,11 @@ static void otx2vf_remove(struct pci_dev *pdev)
 	cancel_work_sync(&vf->reset_task);
 	unregister_netdev(netdev);
 	otx2vf_disable_mbox_intr(vf);
-
 	otx2_detach_resources(&vf->mbox);
+
+	if (vf->hw.lmt_base)
+		iounmap(vf->hw.lmt_base);
+
 	otx2vf_vfaf_mbox_destroy(vf);
 	pci_free_irq_vectors(vf->pdev);
 	pci_set_drvdata(pdev, NULL);