lkml.org 
[lkml]   [2018]   [Mar]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH v5 06/14] net/mlx4_core: Report PCIe link properties with pcie_print_link_status()
From
Date
From: Tal Gilboa <talgi@mellanox.com>

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

Signed-off-by: Tal Gilboa <talgi@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/net/ethernet/mellanox/mlx4/main.c | 81 -----------------------------
1 file changed, 1 insertion(+), 80 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 4d84cab77105..30cacac54e69 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -623,85 +623,6 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
return 0;
}

-static int mlx4_get_pcie_dev_link_caps(struct mlx4_dev *dev,
- enum pci_bus_speed *speed,
- enum pcie_link_width *width)
-{
- u32 lnkcap1, lnkcap2;
- int err1, err2;
-
-#define PCIE_MLW_CAP_SHIFT 4 /* start of MLW mask in link capabilities */
-
- *speed = PCI_SPEED_UNKNOWN;
- *width = PCIE_LNK_WIDTH_UNKNOWN;
-
- err1 = pcie_capability_read_dword(dev->persist->pdev, PCI_EXP_LNKCAP,
- &lnkcap1);
- err2 = pcie_capability_read_dword(dev->persist->pdev, PCI_EXP_LNKCAP2,
- &lnkcap2);
- if (!err2 && lnkcap2) { /* PCIe r3.0-compliant */
- if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
- *speed = PCIE_SPEED_8_0GT;
- else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
- *speed = PCIE_SPEED_5_0GT;
- else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
- *speed = PCIE_SPEED_2_5GT;
- }
- if (!err1) {
- *width = (lnkcap1 & PCI_EXP_LNKCAP_MLW) >> PCIE_MLW_CAP_SHIFT;
- if (!lnkcap2) { /* pre-r3.0 */
- if (lnkcap1 & PCI_EXP_LNKCAP_SLS_5_0GB)
- *speed = PCIE_SPEED_5_0GT;
- else if (lnkcap1 & PCI_EXP_LNKCAP_SLS_2_5GB)
- *speed = PCIE_SPEED_2_5GT;
- }
- }
-
- if (*speed == PCI_SPEED_UNKNOWN || *width == PCIE_LNK_WIDTH_UNKNOWN) {
- return err1 ? err1 :
- err2 ? err2 : -EINVAL;
- }
- return 0;
-}
-
-static void mlx4_check_pcie_caps(struct mlx4_dev *dev)
-{
- enum pcie_link_width width, width_cap;
- enum pci_bus_speed speed, speed_cap;
- int err;
-
-#define PCIE_SPEED_STR(speed) \
- (speed == PCIE_SPEED_8_0GT ? "8.0GT/s" : \
- speed == PCIE_SPEED_5_0GT ? "5.0GT/s" : \
- speed == PCIE_SPEED_2_5GT ? "2.5GT/s" : \
- "Unknown")
-
- err = mlx4_get_pcie_dev_link_caps(dev, &speed_cap, &width_cap);
- if (err) {
- mlx4_warn(dev,
- "Unable to determine PCIe device BW capabilities\n");
- return;
- }
-
- err = pcie_get_minimum_link(dev->persist->pdev, &speed, &width);
- if (err || speed == PCI_SPEED_UNKNOWN ||
- width == PCIE_LNK_WIDTH_UNKNOWN) {
- mlx4_warn(dev,
- "Unable to determine PCI device chain minimum BW\n");
- return;
- }
-
- if (width != width_cap || speed != speed_cap)
- mlx4_warn(dev,
- "PCIe BW is different than device's capability\n");
-
- mlx4_info(dev, "PCIe link speed is %s, device supports %s\n",
- PCIE_SPEED_STR(speed), PCIE_SPEED_STR(speed_cap));
- mlx4_info(dev, "PCIe link width is x%d, device supports x%d\n",
- width, width_cap);
- return;
-}
-
/*The function checks if there are live vf, return the num of them*/
static int mlx4_how_many_lives_vf(struct mlx4_dev *dev)
{
@@ -3475,7 +3396,7 @@ static int mlx4_load_one(struct pci_dev *pdev, int pci_dev_data,
* express device capabilities are under-satisfied by the bus.
*/
if (!mlx4_is_slave(dev))
- mlx4_check_pcie_caps(dev);
+ pcie_print_link_status(dev->persist->pdev);

/* In master functions, the communication channel must be initialized
* after obtaining its address from fw */
\
 
 \ /
  Last update: 2018-03-30 23:08    [W:0.198 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site