Increase maximum allowable MTU of the T4/T5 to 9600
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Authored by jpaetzel on Oct 13 2016, 2:46 AM.

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rS307233: cxgbe(4): Allow the interface MTU to be set as high as the actual

Summary

The current driverlimits the MTU to 9000. This appears to be a software limitation

as the hardware supports setting an MTU of 9600

Test Plan

A kernel has already been built which allows ifconfig cxl0 mtu 9600, further testing is needed

to ensure traffic of this size actually works.

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rS FreeBSD src repository - subversion

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jpaetzel updated this revision to Diff 21339.Oct 13 2016, 2:46 AM

jpaetzel retitled this revision from to Increase maximum allowable MTU of the T4/T5 to 9600.

jpaetzel updated this object.

jpaetzel edited the test plan for this revision. (Show Details)

jpaetzel added a reviewer: np.

Herald added a subscriber: imp. · View Herald TranscriptOct 13 2016, 2:46 AM

You could use MAX_MTU from t4_hw.h instead of CHELSIO_T5_MAXMTU.

Run time testing shows this as working properly with no ill effects.

The patch is adopted from a patch to the stable/10 sources and the include in common/common.h is kind of out of place in HEAD. I'll leave it to np@'s discretion to rejigger as he sees fit.

Closed by commit rS307233: cxgbe(4): Allow the interface MTU to be set as high as the actual (authored by np). · Explain WhyOct 13 2016, 7:40 PM

This revision was automatically updated to reflect the committed changes.

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head/

sys/

dev/

cxgbe/

t4_main.c

2 lines

Diff 21370

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head/sys/dev/cxgbe/t4_main.c

Increase maximum allowable MTU of the T4/T5 to 9600ClosedPublicActions