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net/mlx5e: Use pcie_bandwidth_available() to compute bandwidth

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Use the new pci_bandwidth_available() function to calculate maximum
available bandwidth through the PCI chain instead of computing it ourselves
with mlx5e_get_pci_bw().

This is used to detect when the device is capable of more bandwidth than is
available in the current slot.  The driver may adjust compression settings
accordingly.

Note that pci_bandwidth_available() accounts for PCIe encoding overhead, so
it is more accurate than mlx5e_get_pci_bw() was.

Signed-off-by: Tal Gilboa <talgi@mellanox.com>
[bhelgaas: remove mlx5e_get_pci_bw() wrapper altogether]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
This commit is contained in:
Tal Gilboa 2018-03-30 09:01:51 -05:00 committed by Bjorn Helgaas
parent 00c6bcb0d6
commit 33523a3613
1 changed files with 1 additions and 31 deletions
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32
drivers/net/ethernet/mellanox/mlx5/core/en_main.c
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@ -3864,36 +3864,6 @@ void mlx5e_build_default_indir_rqt(u32 *indirection_rqt, int len,
indirection_rqt[i] = i % num_channels;
}
static int mlx5e_get_pci_bw(struct mlx5_core_dev *mdev, u32 *pci_bw)
{
enum pcie_link_width width;
enum pci_bus_speed speed;
int err = 0;
err = pcie_get_minimum_link(mdev->pdev, &speed, &width);
if (err)
return err;
if (speed == PCI_SPEED_UNKNOWN || width == PCIE_LNK_WIDTH_UNKNOWN)
return -EINVAL;
switch (speed) {
case PCIE_SPEED_2_5GT:
*pci_bw = 2500 * width;
break;
case PCIE_SPEED_5_0GT:
*pci_bw = 5000 * width;
break;
case PCIE_SPEED_8_0GT:
*pci_bw = 8000 * width;
break;
default:
return -EINVAL;
}
return 0;
}
static bool cqe_compress_heuristic(u32 link_speed, u32 pci_bw)
{
return (link_speed && pci_bw &&
@ -3979,7 +3949,7 @@ void mlx5e_build_nic_params(struct mlx5_core_dev *mdev,
params->num_tc = 1;
mlx5e_get_max_linkspeed(mdev, &link_speed);
mlx5e_get_pci_bw(mdev, &pci_bw);
pci_bw = pcie_bandwidth_available(mdev->pdev, NULL, NULL, NULL);
mlx5_core_dbg(mdev, "Max link speed = %d, PCI BW = %d\n",
link_speed, pci_bw);