These patches introduce the ability to report PCI link width and speed for all PCI devices in kernel log. This would reduce code duplication between drivers and unify the approach for reporting PCI link status. Implemented and tested for Mellanox devices. v4: Reverted most of v2, meaning re-introduced bandwidth limitation calculation. Limiting device is now returned from the available PCIe bandwidth calculation function and is logged in kernel log (suggested by Bjorn Helgaas and Jacob E. Keller). Applied PCIe encoding overhead to PCIe bandwidth calculation (available/capable). this way upper bandwidth limit of the device is more accurate. v3: Add Reviewed-by: Tariq Toukan to all commits. v2: Remove chain BW calculation. This might be a nice feature, but without the ability to know the exact limiting part, it is more confusing than useful. Remove warnings for failed PCI query actions, leaving only the status and gaps from max capabilities report. Use pci_warn()/pci_info() instead of dev_warn()/dev_info(). (suggested by Bjorn Helgaas). v1: Split to multiple patches, calculate BW limitation and remove MACRO definition for LNKCAP shift (suggested by Bjorn Helgaas). Multiple fixes - conventions, typos, function naming and functional (suggested by Tariq Toukan). Tal Gilboa (8): PCI: Add a query function for PCI device's speed cap PCI: Add a query function for PCI device's width cap PCI: Add device link bandwidth capabilities calculation PCI: Calculate available bandwidth for PCI devices PCI: Print PCI device link status in kernel log net/mlx4_core: Report PCI properties using dedicated function net/mlx5: Report device PCI link status and issues net/mlx5e: Use generic PCI function for bandwidth calculation drivers/net/ethernet/mellanox/mlx4/main.c | 81 +---------- drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 17 +-- drivers/net/ethernet/mellanox/mlx5/core/main.c | 4 + drivers/pci/pci-sysfs.c | 28 ++-- drivers/pci/pci.c | 161 +++++++++++++++++++++- include/linux/pci.h | 24 ++++ 6 files changed, 194 insertions(+), 121 deletions(-) -- 1.8.3.1
