[PATCH net-next] octeontx2-pf: Add NIXLF error and poison interrupt handlers

From: Naveen Mamindlapalli <[email protected]>

Register and handle the NIX LF error (NIX_LF_ERR_INT) and poison/RAS
(NIX_LF_RAS) interrupt vectors, The handlers acknowledge the interrupt
and log the status (ratelimited) to help debug NIX LF faults.

Signed-off-by: Nitin Shetty J <[email protected]>
Signed-off-by: Naveen Mamindlapalli <[email protected]>
---
 .../ethernet/marvell/octeontx2/nic/otx2_pf.c  | 80 ++++++++++++++++++-
 .../ethernet/marvell/octeontx2/nic/otx2_reg.h |  2 +
 .../ethernet/marvell/octeontx2/nic/otx2_vf.c  |  2 +-
 3 files changed, 82 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
index c995f2900859..61b0334d0b6e 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
@@ -1524,6 +1524,34 @@ irqreturn_t otx2_cq_intr_handler(int irq, void *cq_irq)
 }
 EXPORT_SYMBOL(otx2_cq_intr_handler);
 
+static irqreturn_t otx2_nixlf_err_intr_handler(int irq, void *data)
+{
+	struct otx2_nic *pf = data;
+	u64 regval;
+
+	/* Clear interrupt */
+	regval = otx2_read64(pf, NIX_LF_ERR_INT);
+	otx2_write64(pf, NIX_LF_ERR_INT, regval);
+
+	dev_err_ratelimited(pf->dev, "NIXLF Error Interrupt: 0x%llx\n", regval);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t otx2_nixlf_poison_intr_handler(int irq, void *data)
+{
+	struct otx2_nic *pf = data;
+	u64 regval;
+
+	/* Clear interrupt */
+	regval = otx2_read64(pf, NIX_LF_RAS);
+	otx2_write64(pf, NIX_LF_RAS, regval);
+
+	dev_err_ratelimited(pf->dev, "NIXLF Poison Interrupt: 0x%llx\n", regval);
+
+	return IRQ_HANDLED;
+}
+
 void otx2_disable_napi(struct otx2_nic *pf)
 {
 	struct otx2_qset *qset = &pf->qset;
@@ -2080,6 +2108,34 @@ int otx2_open(struct net_device *netdev)
 
 	otx2_set_cints_affinity(pf);
 
+	/* Register NIXLF error IRQ handler */
+	vec = pf->hw.nix_msixoff + NIX_LF_ERR_VEC;
+	irq_name = &pf->hw.irq_name[vec * NAME_SIZE];
+	snprintf(irq_name, NAME_SIZE, "%s-nixlf-err", pf->netdev->name);
+	err = request_irq(pci_irq_vector(pf->pdev, vec),
+			  otx2_nixlf_err_intr_handler, 0, irq_name, pf);
+	if (err) {
+		dev_err(pf->dev,
+			"RVUPF%d: IRQ registration failed for NIXLF ERR vector\n",
+			rvu_get_pf(pf->pdev, pf->pcifunc));
+		goto err_free_cints;
+	}
+	otx2_write64(pf, NIX_LF_ERR_INT_ENA_W1S, NIX_LF_ERR_INT_MASK);
+
+	/* Register NIXLF POISON interrupt handler */
+	vec = pf->hw.nix_msixoff + NIX_LF_POISON_VEC;
+	irq_name = &pf->hw.irq_name[vec * NAME_SIZE];
+	snprintf(irq_name, NAME_SIZE, "%s-nixlf-poison", pf->netdev->name);
+	err = request_irq(pci_irq_vector(pf->pdev, vec),
+			  otx2_nixlf_poison_intr_handler, 0, irq_name, pf);
+	if (err) {
+		dev_err(pf->dev,
+			"RVUPF%d: IRQ registration failed for NIXLF POISON vector\n",
+			rvu_get_pf(pf->pdev, pf->pcifunc));
+		goto err_free_errint;
+	}
+	otx2_write64(pf, NIX_LF_RAS_ENA_W1S, NIX_LF_RAS_MASK);
+
 	if (pf->flags & OTX2_FLAG_RX_VLAN_SUPPORT)
 		otx2_enable_rxvlan(pf, true);
 
@@ -2132,6 +2188,16 @@ int otx2_open(struct net_device *netdev)
 	netif_tx_stop_all_queues(netdev);
 	netif_carrier_off(netdev);
 	pf->flags |= OTX2_FLAG_INTF_DOWN;
+	/* free NIXLF POISON irq */
+	vec = pci_irq_vector(pf->pdev,
+			     pf->hw.nix_msixoff + NIX_LF_POISON_VEC);
+	otx2_write64(pf, NIX_LF_RAS_ENA_W1C, NIX_LF_RAS_MASK);
+	free_irq(vec, pf);
+err_free_errint:
+	vec = pci_irq_vector(pf->pdev,
+			     pf->hw.nix_msixoff + NIX_LF_ERR_VEC);
+	otx2_write64(pf, NIX_LF_ERR_INT_ENA_W1C, NIX_LF_ERR_INT_MASK);
+	free_irq(vec, pf);
 err_free_cints:
 	otx2_free_cints(pf, qidx);
 	vec = pci_irq_vector(pf->pdev,
@@ -2171,6 +2237,18 @@ int otx2_stop(struct net_device *netdev)
 	/* Clear RSS enable flag */
 	pf->hw.rss_info.enable = false;
 
+	/* Cleanup NIXLF Poison IRQ */
+	vec = pci_irq_vector(pf->pdev,
+			     pf->hw.nix_msixoff + NIX_LF_POISON_VEC);
+	otx2_write64(pf, NIX_LF_RAS_ENA_W1C, NIX_LF_RAS_MASK);
+	free_irq(vec, pf);
+
+	/* Cleanup NIXLF Error IRQ */
+	vec = pci_irq_vector(pf->pdev,
+			     pf->hw.nix_msixoff + NIX_LF_ERR_VEC);
+	otx2_write64(pf, NIX_LF_ERR_INT_ENA_W1C, NIX_LF_ERR_INT_MASK);
+	free_irq(vec, pf);
+
 	/* Cleanup Queue IRQ */
 	vec = pci_irq_vector(pf->pdev,
 			     pf->hw.nix_msixoff + NIX_LF_QINT_VEC_START);
@@ -3010,7 +3088,7 @@ int otx2_realloc_msix_vectors(struct otx2_nic *pf)
 	 * upto NIX vector offset.
 	 */
 	num_vec = hw->nix_msixoff;
-	num_vec += NIX_LF_CINT_VEC_START + hw->max_queues;
+	num_vec += NIX_LF_POISON_VEC + 1;
 
 	otx2_disable_mbox_intr(pf);
 	pci_free_irq_vectors(hw->pdev);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_reg.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_reg.h
index 1cd576fd09c5..c144fd2bbe51 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_reg.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_reg.h
@@ -121,10 +121,12 @@
 #define	NIX_LF_ERR_INT_W1S		(NIX_LFBASE | 0x228)
 #define	NIX_LF_ERR_INT_ENA_W1C		(NIX_LFBASE | 0x230)
 #define	NIX_LF_ERR_INT_ENA_W1S		(NIX_LFBASE | 0x238)
+#define	NIX_LF_ERR_INT_MASK		GENMASK_ULL(31, 0)
 #define	NIX_LF_RAS			(NIX_LFBASE | 0x240)
 #define	NIX_LF_RAS_W1S			(NIX_LFBASE | 0x248)
 #define	NIX_LF_RAS_ENA_W1C		(NIX_LFBASE | 0x250)
 #define	NIX_LF_RAS_ENA_W1S		(NIX_LFBASE | 0x258)
+#define	NIX_LF_RAS_MASK			GENMASK_ULL(10, 0)
 #define	NIX_LF_SQ_OP_ERR_DBG		(NIX_LFBASE | 0x260)
 #define	NIX_LF_MNQ_ERR_DBG		(NIX_LFBASE | 0x270)
 #define	NIX_LF_SEND_ERR_DBG		(NIX_LFBASE | 0x280)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index b022f52c6845..2a5630561b12 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -554,7 +554,7 @@ static int otx2vf_realloc_msix_vectors(struct otx2_nic *vf)
 	int num_vec, err;
 
 	num_vec = hw->nix_msixoff;
-	num_vec += NIX_LF_CINT_VEC_START + hw->max_queues;
+	num_vec += NIX_LF_POISON_VEC + 1;
 
 	otx2vf_disable_mbox_intr(vf);
 	pci_free_irq_vectors(hw->pdev);
-- 
2.48.1