Chelsio Communications Chelsio T5 Betriebsanweisung PDF herunterladen (Seite 250)

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Chapter XVIII. Classification and Filtering

Chelsio T5/T4 Unified Wire For Linux Page 250

3.5. Hit Counters

For LE-TCAM filters, hit counters will work simply by adding hitcnts 1 parameter to the filter rule.

However, for Hash/DDR filters, you will have to make use of tracing feature and RSS queues.

Here’s a step-by-step guide to enable hit counters for Hash/DDR filter rules:

i. Enable tracing on T5 adapter.

[root@host]# cxgbtool ethX reg 0x09800=0x13

ii. Setup a trace filter

[root@host]# echo tx1 snaplen=40 > /proc/driver/cxgb4/<bus_id>/trace0

iii. Configure RSS Queue to send trace packets. Determine the RspQ ID of the queues by

looking at Trace QType in /sys/kernel/debug/cxgb4/<bus-id>/sge_qinfo file

[root@host]# cxgbtool ethX reg 0x0a00c=<Trace Queue0-RspQ ID>

The above step will trace all the packets transmitting from port1(tx1) to trace filter 0.

 Multi-tracing

To enable hit counters for multiple chelsio ports in Tx/Rx direction enable Multi-tracing. Using

this we can configure 4 different RSS Queues separately corresponding to 4 trace-filters.

i. Enable Tracing as well as MultiRSSFilter

[root@host]# cxgbtool ethX reg 0x09800=0x33

ii. Setup a trace filter

[root@host]# echo tx0 snaplen=40 > /proc/driver/cxgb4/<bus_id>/trace0

Use “snaplen=60” in case of IPV6.

Note

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