tools: netmap: pkt-gen: check packet length against interface MTU
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Authored by vmaffione on Dec 5 2018, 3:45 PM.

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rS342035: MFC r341726
rS342032: MFC r341726
rS341726: tools: netmap: pkt-gen: check packet length against interface MTU

Summary

Validate the value of the -l argument (packet length) against the MTU of the netmap port.
In case the netmap port does not refer to a physical interface (e.g. VALE port or pipe), then
the netmap buffer size is used as MTU.
This change also sets a better default value for the -M option, so that pkt-gen uses
the largest possible fragments in case of multi-slot packets.

Test Plan

Performed several pkt-gen tests with and without jumbo frames on em interfaces.