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Date: Thu, 30 Jan 2020 13:32:52 -0800
From: Robert Jones <rjones@...eworks.com>
To: Sunil Goutham <sgoutham@...vell.com>,
Robert Richter <rrichter@...vell.com>,
David Miller <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH net v2] net: thunderx: workaround BGX TX Underflow issue
From: Tim Harvey <tharvey@...eworks.com>
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@...eworks.com>
Reviewed-by: Robert Jones <rjones@...eworks.com>
---
Changes in v2:
- Changed bgx_register_intr() to a void return
- Added pci_free_irq_vectors() calls to free irq if named/allocated
- Use snprintf instead of sprintf for irq names
drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 59 +++++++++++++++++++++++
drivers/net/ethernet/cavium/thunder/thunder_bgx.h | 9 ++++
2 files changed, 68 insertions(+)
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index c4f6ec0..cbf8596 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -74,6 +74,7 @@ struct bgx {
struct pci_dev *pdev;
bool is_dlm;
bool is_rgx;
+ char irq_name[7];
};
static struct bgx *bgx_vnic[MAX_BGX_THUNDER];
@@ -1535,6 +1536,53 @@ 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 void bgx_register_intr(struct pci_dev *pdev)
+{
+ struct bgx *bgx = pci_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ int num_vec, ret;
+
+ /* 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;
+ }
+ snprintf(bgx->irq_name, sizeof(bgx->irqname), "BGX%d", bgx->bgx_id);
+ ret = request_irq(pci_irq_vector(pdev, GMPX_GMI_TX_INT),
+ bgx_intr_handler, 0, bgx->irq_name, bgx);
+ if (ret) {
+ if (bgx->irq_name[0])
+ pci_free_irq_vectors(pdev);
+ }
+}
+
static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
int err;
@@ -1604,6 +1652,8 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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);
@@ -1614,12 +1664,18 @@ static int bgx_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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;
err_enable:
bgx_vnic[bgx->bgx_id] = NULL;
+ if (bgx->irq_name[0])
+ pci_free_irq_vectors(pdev);
err_release_regions:
pci_release_regions(pdev);
err_disable_device:
@@ -1637,6 +1693,9 @@ static void bgx_remove(struct pci_dev *pdev)
for (lmac = 0; lmac < bgx->lmac_count; lmac++)
bgx_lmac_disable(bgx, lmac);
+ if (bgx->irq_name[0])
+ pci_free_irq_vectors(pdev);
+
bgx_vnic[bgx->bgx_id] = NULL;
pci_release_regions(pdev);
pci_disable_device(pdev);
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
index 2588870..cdea493 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -180,6 +180,15 @@
#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
--
2.9.2
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