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| author | Sanman Pradhan <sanman.p211993@gmail.com> | 2024-11-15 04:53:43 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-11-19 05:43:41 +0300 |
| commit | 25ba596d137db208ace697e3adc7cc35b3b2882b (patch) | |
| tree | 9b4591529335a37327a69bec0cc3bb3ec5be4e62 /Documentation/networking/device_drivers | |
| parent | 08606cb528bed9f265ea8a99b0c310f3eba0ca89 (diff) | |
| download | linux-25ba596d137db208ace697e3adc7cc35b3b2882b.tar.xz | |
eth: fbnic: add PCIe hardware statistics
Add PCIe hardware statistics support to the fbnic driver. These stats
provide insight into PCIe transaction performance and error conditions.
Which includes, read/write and completion TLP counts and DWORD counts and
debug counters for tag, completion credit and NP credit exhaustion
The stats are exposed via debugfs and can be used to monitor PCIe
performance and debug PCIe issues.
Signed-off-by: Sanman Pradhan <sanman.p211993@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241115015344.757567-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking/device_drivers')
| -rw-r--r-- | Documentation/networking/device_drivers/ethernet/meta/fbnic.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst b/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst index 32ff114f5c26..14f2834d86d1 100644 --- a/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst +++ b/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst @@ -27,3 +27,33 @@ driver takes over. devlink dev info provides version information for all three components. In addition to the version the hg commit hash of the build is included as a separate entry. + +Statistics +---------- + +PCIe +~~~~ + +The fbnic driver exposes PCIe hardware performance statistics through debugfs +(``pcie_stats``). These statistics provide insights into PCIe transaction +behavior and potential performance bottlenecks. + +1. PCIe Transaction Counters: + + These counters track PCIe transaction activity: + - ``pcie_ob_rd_tlp``: Outbound read Transaction Layer Packets count + - ``pcie_ob_rd_dword``: DWORDs transferred in outbound read transactions + - ``pcie_ob_wr_tlp``: Outbound write Transaction Layer Packets count + - ``pcie_ob_wr_dword``: DWORDs transferred in outbound write + transactions + - ``pcie_ob_cpl_tlp``: Outbound completion TLP count + - ``pcie_ob_cpl_dword``: DWORDs transferred in outbound completion TLPs + +2. PCIe Resource Monitoring: + + These counters indicate PCIe resource exhaustion events: + - ``pcie_ob_rd_no_tag``: Read requests dropped due to tag unavailability + - ``pcie_ob_rd_no_cpl_cred``: Read requests dropped due to completion + credit exhaustion + - ``pcie_ob_rd_no_np_cred``: Read requests dropped due to non-posted + credit exhaustion |