virtio_scsi: pend CAM commands when insufficient descriptors
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Authored by adam_fenn.io on Aug 2 2021, 7:49 PM.

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Contributor Reviews (src)

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imp

Summary

Instead of CAM requeues on resource depletion, pend the cmds. Only
un-pend when there are enough virtio descriptors available.

Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
X-NetApp-PR: #60

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Repository

rS FreeBSD src repository - subversion

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Build Status

Buildable 40808
Build 37697: arc lint + arc unit

Event Timeline

adam_fenn.io created this revision.Aug 2 2021, 7:49 PM

adam_fenn.io held this revision as a draft.

Herald added subscribers: Contributor Reviews (src), imp. · View Herald TranscriptAug 2 2021, 7:49 PM

Harbormaster completed remote builds in B40808: Diff 93132.Aug 2 2021, 7:49 PM

adam_fenn.io published this revision for review.Aug 2 2021, 7:52 PM

SIMs generally are supposed to return the requests to CAM for requeueing like was done before.
Why do this? What's the benefit? Almost no other drivers do this.

This revision now requires changes to proceed.Aug 2 2021, 10:37 PM

Revision Contents
Changeset List

Path

Size

sys/

dev/

virtio/

scsi/

virtio_scsi.c

28 lines

virtio_scsivar.h

3 lines

Diff 93132

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sys/dev/virtio/scsi/virtio_scsi.c