> -----Original Message----- > From: Wathsala Vithanage <[email protected]> > Sent: Friday, February 9, 2024 21:42 > 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] 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: Dariusz Sosnowski <[email protected]>
Best regards, Dariusz Sosnowski
