Hi,
> -----Original Message-----
> From: Wathsala Vithanage <[email protected]>
> Sent: Thursday, February 15, 2024 8:27 PM
> To: NBU-Contact-Thomas Monjalon (EXTERNAL) <[email protected]>;
> Dariusz Sosnowski <[email protected]>; Slava Ovsiienko
> <[email protected]>; Ori Kam <[email protected]>; Suanming Mou
> <[email protected]>; Matan Azrad <[email protected]>
> Cc: [email protected]; [email protected]; Wathsala Vithanage
> <[email protected]>; Honnappa Nagarahalli
> <[email protected]>
> Subject: [PATCH v3] net/mlx5: enable PCI related counters
>
> Versions of Mellanox NICs starting from CX5 have device counters related to
> PCI. These counters are helpful in debugging IO bottlenecks. For instance, the
> outbound_pci_stalled_rd and outbound_pci_stalled_wr counters can help
> with identifying NIC stalls due to insufficient PCI credits, which otherwise
> would have required a PCI analyzer or a sophisticated PCI root port with a
> PMU.
> Currently none of these are available in the MLX5 PMD even though ethtool is
> capable of reading some of them.
> Since PMD uses the same ioctl used by ethtool (SIOCETHTOOL) and reads via
> the kernel driver it is possible to add support with ease.
> There is one more PCI related counter and a device counter that aren't
> implemented in the Linux driver at the moment. These two are named
> outbound_pci_buffer_overflow and dev_out_of_buffer respectively. As per
> Nvidia's documentation these two counters can tell the number of packets
> dropped due to pci buffer overflow and the number of times the device
> owned queue had not enough buffers allocated.
>
> Signed-off-by: Wathsala Vithanage <[email protected]>
> Reviewed-by: Honnappa Nagarahalli <[email protected]>
> Acked-by: Viacheslav Ovsiienko <[email protected]>
> Acked-by: Dariusz Sosnowski <[email protected]>
Patch applied to next-net-mlx,
Kindest regards
Raslan Darawsheh
