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From b1e7791e688620c9bb8476ac2d0bc99abeb7f825 Mon Sep 17 00:00:00 2001
From: Tim Harvey <tharvey@gateworks.com>
Date: Fri, 29 Dec 2017 16:48:04 -0800
Subject: [PATCH] net: thunderx: workaround BGX TX Underflow issue
While it is not yet understood why a TX underflow can easily occur
for SGMII interfaces resulting in a TX wedge. It has been found that
disabling/re-enabling the LMAC resolves the issue.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
---
drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 54 +++++++++++++++++++++++
drivers/net/ethernet/cavium/thunder/thunder_bgx.h | 9 ++++
2 files changed, 63 insertions(+)
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -1344,6 +1344,54 @@ static int bgx_init_phy(struct bgx *bgx)
return bgx_init_of_phy(bgx);
}
+static irqreturn_t bgx_intr_handler(int irq, void *data)
+{
+ struct bgx *bgx = (struct bgx *)data;
+ struct device *dev = &bgx->pdev->dev;
+ u64 status, val;
+ int lmac;
+
+ for (lmac = 0; lmac < bgx->lmac_count; lmac++) {
+ status = bgx_reg_read(bgx, lmac, BGX_GMP_GMI_TXX_INT);
+ if (status & GMI_TXX_INT_UNDFLW) {
+ dev_err(dev, "BGX%d lmac%d UNDFLW\n", bgx->bgx_id,
+ lmac);
+ val = bgx_reg_read(bgx, lmac, BGX_CMRX_CFG);
+ val &= ~CMR_EN;
+ bgx_reg_write(bgx, lmac, BGX_CMRX_CFG, val);
+ val |= CMR_EN;
+ bgx_reg_write(bgx, lmac, BGX_CMRX_CFG, val);
+ }
+ /* clear interrupts */
+ bgx_reg_write(bgx, lmac, BGX_GMP_GMI_TXX_INT, status);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int bgx_register_intr(struct pci_dev *pdev)
+{
+ struct bgx *bgx = pci_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ int num_vec, ret;
+ char irq_name[32];
+
+ /* Enable MSI-X */
+ num_vec = pci_msix_vec_count(pdev);
+ ret = pci_alloc_irq_vectors(pdev, num_vec, num_vec, PCI_IRQ_MSIX);
+ if (ret < 0) {
+ dev_err(dev, "Req for #%d msix vectors failed\n", num_vec);
+ return 1;
+ }
+ sprintf(irq_name, "BGX%d", bgx->bgx_id);
+ ret = request_irq(pci_irq_vector(pdev, GMPX_GMI_TX_INT),
+ bgx_intr_handler, 0, irq_name, bgx);
+ if (ret)
+ return 1;
+
+ return 0;
+}
+
static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int err;
@@ -1414,6 +1462,8 @@ static int bgx_probe(struct pci_dev *pde
xcv_init_hw(bgx->phy_mode);
bgx_init_hw(bgx);
+ bgx_register_intr(pdev);
+
/* Enable all LMACs */
for (lmac = 0; lmac < bgx->lmac_count; lmac++) {
err = bgx_lmac_enable(bgx, lmac);
@@ -1424,6 +1474,10 @@ static int bgx_probe(struct pci_dev *pde
bgx_lmac_disable(bgx, --lmac);
goto err_enable;
}
+
+ /* enable TX FIFO Underflow interrupt */
+ bgx_reg_modify(bgx, lmac, BGX_GMP_GMI_TXX_INT_ENA_W1S,
+ GMI_TXX_INT_UNDFLW);
}
return 0;
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -179,6 +179,15 @@
#define BGX_GMP_GMI_TXX_BURST 0x38228
#define BGX_GMP_GMI_TXX_MIN_PKT 0x38240
#define BGX_GMP_GMI_TXX_SGMII_CTL 0x38300
+#define BGX_GMP_GMI_TXX_INT 0x38500
+#define BGX_GMP_GMI_TXX_INT_W1S 0x38508
+#define BGX_GMP_GMI_TXX_INT_ENA_W1C 0x38510
+#define BGX_GMP_GMI_TXX_INT_ENA_W1S 0x38518
+#define GMI_TXX_INT_PTP_LOST BIT_ULL(4)
+#define GMI_TXX_INT_LATE_COL BIT_ULL(3)
+#define GMI_TXX_INT_XSDEF BIT_ULL(2)
+#define GMI_TXX_INT_XSCOL BIT_ULL(1)
+#define GMI_TXX_INT_UNDFLW BIT_ULL(0)
#define BGX_MSIX_VEC_0_29_ADDR 0x400000 /* +(0..29) << 4 */
#define BGX_MSIX_VEC_0_29_CTL 0x400008
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