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Subject[PATCH v5 10/14] bnxt_en: Report PCIe link properties with pcie_print_link_status()
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From: Bjorn Helgaas <bhelgaas@google.com>

Use pcie_print_link_status() to report PCIe link speed and possible
limitations instead of implementing this in the driver itself.

Note that pcie_get_minimum_link() can return misleading information because
it finds the slowest link and the narrowest link without considering the
total bandwidth of the link. If the path contains a 16 GT/s x1 link and a
2.5 GT/s x16 link, pcie_get_minimum_link() returns 2.5 GT/s x1, which
corresponds to 250 MB/s of bandwidth, not the actual available bandwidth of
about 2000 MB/s for a 16 GT/s x1 link.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 19 +------------------
1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 1500243b9886..3be42431e029 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -8469,22 +8469,6 @@ static int bnxt_init_mac_addr(struct bnxt *bp)
return rc;
}

-static void bnxt_parse_log_pcie_link(struct bnxt *bp)
-{
- enum pcie_link_width width = PCIE_LNK_WIDTH_UNKNOWN;
- enum pci_bus_speed speed = PCI_SPEED_UNKNOWN;
-
- if (pcie_get_minimum_link(pci_physfn(bp->pdev), &speed, &width) ||
- speed == PCI_SPEED_UNKNOWN || width == PCIE_LNK_WIDTH_UNKNOWN)
- netdev_info(bp->dev, "Failed to determine PCIe Link Info\n");
- else
- netdev_info(bp->dev, "PCIe: Speed %s Width x%d\n",
- speed == PCIE_SPEED_2_5GT ? "2.5GT/s" :
- speed == PCIE_SPEED_5_0GT ? "5.0GT/s" :
- speed == PCIE_SPEED_8_0GT ? "8.0GT/s" :
- "Unknown", width);
-}
-
static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int version_printed;
@@ -8694,8 +8678,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
netdev_info(dev, "%s found at mem %lx, node addr %pM\n",
board_info[ent->driver_data].name,
(long)pci_resource_start(pdev, 0), dev->dev_addr);
-
- bnxt_parse_log_pcie_link(bp);
+ pcie_print_link_status(pdev);

return 0;

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