> -----Original Message----- > From: Wathsala Vithanage <wathsala.vithan...@arm.com> > Sent: Friday, February 9, 2024 21:42 > To: NBU-Contact-Thomas Monjalon (EXTERNAL) <tho...@monjalon.net>; > Dariusz Sosnowski <dsosnow...@nvidia.com>; Slava Ovsiienko > <viachesl...@nvidia.com>; Ori Kam <or...@nvidia.com>; Suanming Mou > <suanmi...@nvidia.com>; Matan Azrad <ma...@nvidia.com> > Cc: dev@dpdk.org; n...@arm.com; Wathsala Vithanage > <wathsala.vithan...@arm.com>; Honnappa Nagarahalli > <honnappa.nagaraha...@arm.com> > 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 <wathsala.vithan...@arm.com> > Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com> Acked-by: Dariusz Sosnowski <dsosnow...@nvidia.com>
Best regards, Dariusz Sosnowski
