Improve TX path of the VNIC driver
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Authored by zbb on Mar 3 2016, 5:31 PM.

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wma
andrew
imp

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rS297450: Improve TX path of the VNIC driver

Summary

Avoid memory leak when nicvf_tx_mbuf_locked() fails
Introduce nicvf_xmit_locked() routine that uses drbr_peek(), drbr_advance() or drbr_putback() for a specific ifnet. This gives more clear and efficient design as well as prevents from dropping mbufs that where not sent due to temporary lack of descriptors.
Add missing ETHER_BPF_MTAP() hook

Pointed out by: yongari

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zbb updated this revision to Diff 14033.Mar 3 2016, 5:31 PM

zbb retitled this revision from to Improve TX path of the VNIC driver.

zbb updated this object.

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

zbb added reviewers: wma, imp, andrew.

zbb set the repository for this revision to rS FreeBSD src repository - subversion.

zbb added a subscriber: arm64.

My only concern is using of drbr_advance, drbr_peek. Previous drbr_dequeue is well tested in our LAB. If you run overnight multithreaded bidirectional iperf3, then I'm fine with this change. I just don't trust anything from buf_ring.h on ARM...

zbb updated this revision to Diff 14710.Mar 29 2016, 1:17 PM

zbb edited edge metadata.

zbb removed rS FreeBSD src repository - subversion as the repository for this revision.

wma accepted this revision.Mar 31 2016, 12:51 PM

wma edited edge metadata.

This revision is now accepted and ready to land.Mar 31 2016, 12:51 PM

Closed by commit rS297450: Improve TX path of the VNIC driver (authored by zbb). · Explain WhyMar 31 2016, 1:10 PM

This revision was automatically updated to reflect the committed changes.