ena: Trigger reset when mbuf is NULL error happens
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Authored by osamaabb_amazon.com on Aug 20 2024, 8:47 AM.

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imp

Details

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cperciva

Summary

The mbuf is NULL issue happens when the device sends the driver
a completion with a wrong request id.
Trigger a reset whenever this happens.

Approved by: cperciva
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

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rG FreeBSD src repository

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No Test Coverage

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Buildable 59092
Build 55979: arc lint + arc unit

Event Timeline

osamaabb_amazon.com created this revision.Aug 20 2024, 8:47 AM

Herald added a subscriber: imp. · View Herald TranscriptAug 20 2024, 8:47 AM

osamaabb_amazon.com requested review of this revision.Aug 20 2024, 8:47 AM

Harbormaster completed remote builds in B59092: Diff 142222.Aug 20 2024, 8:47 AM

This seems like it could be a kernel panic rather than merely logging an error and resetting the device.

In D46363#1064460, @cperciva wrote:

This seems like it could be a kernel panic rather than merely logging an error and resetting the device.

We're using the same approach as in [1] here, in case theres a single bit flip causing a funny RX request ID being processed by the driver (hence the null mbuf) we'd like to maintain networking availability
[1] https://reviews.freebsd.org/D46337

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sys/

dev/

ena/

ena_datapath.c

8 lines

Diff 142222

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sys/dev/ena/ena_datapath.c

ena: Trigger reset when mbuf is NULL error happensNeeds ReviewPublicActions