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Tsirkin" To: Srujana Challa Cc: "qemu-devel@nongnu.org" , Vamsi Krishna Attunuru , Jerin Jacob Kollanukkaran Subject: Re: Regarding VIRTIO_F_IN_ORDER and VIRTIO_F_NOTIFICATION_DATA feature bits Message-ID: <20231213114214-mutt-send-email-mst@kernel.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.133.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Wed, Dec 13, 2023 at 04:27:40PM +0000, Srujana Challa wrote: > Hi Michael, > > While verifying virtio frontend drivers of guest OS on qemu with vhost-vdpa backend, > we came across feature bits VIRTIO_F_IN_ORDER and VIRTIO_F_NOTIFICATION_DATA, > which are introduced in virtio 1.1 spec, are not yet enabled in qemu. These feature flags > are very much useful for achieving better virtio-net performance and most of the latest > hardware VDPA devices supports these feature flags as per of virtio spec. Could you share more about which device do you mean? Does Marvell ship or intends to ship one? > Could you let us know if there are any plans, to add support for these features in upcoming > qemu releases. > I guess there was some discussion on VIRTIO_F_IN_ORDER feature bit long ago, > https://patchew.org/QEMU/1533833677-27512-1-git-send-email-i.maximets@samsung.com/ > Seems like that discussion has not reached any conclusion or further work. > > Thanks, > Srujana. Yes that patch got comments and these were not addressed. Feel free to address them so this can proceed. -- MST