User Manual

Rev 2.3-1.0.1

Mellanox Technologies

Upon driver start up:

1. Sense the adapter card’s port type:

If a valid cable or module is connected (QSFP, SFP+, or SFP with EEPROM in the cable/mod-

ule):

• Set the port type to the sensed link type (IB/Ethernet)

Otherwise:

• Set the port type as default (Ethernet)

During driver run time:

• Sense a link every 3 seconds if no link is sensed/detected

• If sensed, set the port type as sensed

3.1.1.2 Counters

Counters are used to provide information about how well an operating system, an application, a

service, or a driver is performing.

The counter data helps determine system bottlenecks and fine-

tune the system and application performance. The operating system, network, and devices pro-

vide counter data that an application can consume to provide users with a graphical view of how

well the system is performing.

The counter index is a QP attribute given in the QP context. Multiple QPs may be associated with

the same counter set, If multiple QPs share the same counter its value represents the cumulative

total.

• ConnectX®-3 supports 127 different counters which are allocated as follow:

• 4 counters reserved for PF - 2 counters for each port

• 2 counters reserved for VF - 1 counter for each port

• All other counters if exist are allocated by demand

• RoCE counters are available only through sysfs located under:

• # /sys/class/infiniband/mlx4_*/ports/*/counters/

• # /sys/class/infiniband/mlx4_*/ports/*/counters_ext/

• Physical Function can also read Virtual Functions' port counters through sysfs located

under:

• # /sys/class/net/eth*/vf*_statistics/

To display the network device Ethernet statistics, you can run:

Ethtool -S <devname>

Counter Description

rx_packets Total packets successfully received.

rx_bytes Total bytes in successfully received packets.

rx_multicast_packets Total multicast packets successfully received.

rx_broadcast_packets Total broadcast packets successfully received.

rx_errors Number of receive packets that contained errors preventing them

from being deliverable to a higher

-layer protocol.