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Skuhra" To: Andrew Turner Cc: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org, Sarah Walker Subject: Re: git: b5bad6df467c - main - virtio_net: Use bus_dma for command/ack buffers In-Reply-To: <69ef4ad0.1f221.796b75f@gitrepo.freebsd.org> References: <69ef4ad0.1f221.796b75f@gitrepo.freebsd.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/31.0 Mule/6.0 List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spamd-Result: default: False [-2.60 / 15.00]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-0.998]; R_DKIM_ALLOW(-0.20)[gojira.at:s=fm2,messagingengine.com:s=fm3]; R_SPF_ALLOW(-0.20)[+ip4:202.12.124.128/27]; RCVD_IN_DNSWL_LOW(-0.10)[202.12.124.147:from]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[gojira.at]; RCVD_COUNT_THREE(0.00)[3]; RCVD_TLS_LAST(0.00)[]; TO_DN_SOME(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[messagingengine.com:dkim]; TO_MATCH_ENVRCPT_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DKIM_TRACE(0.00)[gojira.at:+,messagingengine.com:+]; MLMMJ_DEST(0.00)[dev-commits-src-all@FreeBSD.org,dev-commits-src-main@FreeBSD.org]; ASN(0.00)[asn:151847, ipnet:202.12.124.0/24, country:AU]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_FIVE(0.00)[5] X-Spamd-Bar: -- X-Rspamd-Queue-Id: 4g6QPT0Pqqz3tD7 On Mon, 27 Apr 2026 13:38:56 +0200, Andrew Turner wrote: > > The branch main has been updated by andrew: > > URL: https://cgit.FreeBSD.org/src/commit/?id=b5bad6df467cc95bea641afe674c55cd5b9f1510 > > commit b5bad6df467cc95bea641afe674c55cd5b9f1510 > Author: Sarah Walker > AuthorDate: 2026-02-27 14:17:15 +0000 > Commit: Andrew Turner > CommitDate: 2026-04-27 11:37:53 +0000 > > virtio_net: Use bus_dma for command/ack buffers > > While the majority of virtio platforms will be fully coherent, some may > require cache maintenance or other specific device memory handling (eg for > secure partitioning). Using bus_dma allows for these usecases. > > The virtio buffers are marked as coherent; this should ensure that sync > calls are no-ops in the common cases. > > Reviewed by: andrew > Sponsored by: Arm Ltd > Differential Revision: https://reviews.freebsd.org/D55564 > --- > sys/dev/virtio/network/if_vtnet.c | 336 +++++++++++++++++++++++++++++------ > sys/dev/virtio/network/if_vtnetvar.h | 6 + > 2 files changed, 284 insertions(+), 58 deletions(-) After this change SFTP transfers are stalling/failing: Connected to server. sftp> get file.img Fetching /home/herbert/file.img to file.img file.img 1% 35MB 0.0KB/s - stalled - No new transfer are possible after reconnecting: Connected to server. sftp> get file.img Fetching /home/herbert/file.img to file.img file.img 0% 0 0.0KB/s --:-- ETA file.img 0% 0 0.0KB/s - stalled - Read from remote host xxx Connection reset by peer client_loop: send disconnect: Broken pipe Connection closed And (during/afterwards) /var/log/messages is being filled with the following error: May 1 10:42:00 srv03 kernel: ata0: FAILURE - load data May 1 10:42:00 srv03 kernel: ata0: setting up DMA failed I am running GENERIC-NODEBUG on a amd64 system. Reverting this commit (and c16c95192f01) resolves the issue. -- Herbert