Public bug reported:
This one is used to track a code merge of the tmfifo driver.
SRU Justification:
[Impact]
* The virtio framework uses wmb() when updating avail->idx. It guarantees the
write order, but not necessarily loading order for the code accessing the
memory. So potentially it could cause traffic stuck which has been observed in
the field.
[Fix]
* This commit adds a load barrier after reading the avail->idx to make sure all
the data in the descriptor is visible. It also adds a barrier when returning
the packet to virtio framework to make sure read/writes are visible to the
virtio code.
[Test Case]
* Just normal test. This change doesn't affect any functionality.
[Regression Potential]
* SQA team has been running test with this fix for quite some time (several
months). No issue as observed.
[Other]
* N/A
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1927262
Title:
tmfifo: Fix a memory barrier issue
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