d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

bhyve: Fix vtscsi maximum segment config

Browse Source 
The seg_max value reported to the guest should be two less than the
host's maximum, in order to leave room for the request and the
response.  This is analogous to r347033 for virtio_block.

We hit the "too many segments to enqueue" assertion on OneFS because
we increase MAXPHYS to 256 KB.

Reviewed by:	bryanv
Discussed with:	cem jhb rgrimes
MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D20529
This commit is contained in:
Eric van Gyzen 2019-06-21 18:57:33 +00:00
parent 6425fed7e6
commit db2114b4b8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349278
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
usr.sbin/bhyve/pci_virtio_scsi.c
View File

@ -309,7 +309,8 @@ pci_vtscsi_reset(void *vsc)
/* initialize config structure */
sc->vss_config = (struct pci_vtscsi_config){
.num_queues = VTSCSI_REQUESTQ,
.seg_max = VTSCSI_MAXSEG,
/* Leave room for the request and the response. */
.seg_max = VTSCSI_MAXSEG - 2,
.max_sectors = 2,
.cmd_per_lun = 1,
.event_info_size = sizeof(struct pci_vtscsi_event),