Chelsio Communications Chelsio T5 User's Guide download pdf (Page 229)

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Chapter XVII. WD Sniffing and Tracing

Chelsio T5/T4 Unified Wire For Linux Page 229

1. Theory of Operation

The objective of these utilities (wd_sniffer and wd_tcpdump_trace) is to provide sniffing and

tracing capabilities by making use of T4's hardware features.

Sniffer- Involves targeting specific multicast traffic and sending it directly to user space.

a) Get a Queue (raw QP) idx.

b) Program a filter to redirect specific traffic to the raw QP queue.

Tracer - All tapped traffic is forwarded to user space and also pushed back on the wire via

the internal loop back mechanism

a) Get a Queue (raw QP) idx

b) Set the T4 adapter in loop back

c) Connect Client A and B to ports 0 and 1 or ports 2 and 3.

d) Enable tracing.

In either mode the targeted traffic bypasses the kernel TCP/IP stack and is delivered directly to

user space by means of an RX queue.

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