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[87.10.72.39]) by smtp.gmail.com with ESMTPSA id di4sm3852618ejc.11.2021.11.05.01.31.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Nov 2021 01:31:10 -0700 (PDT) Date: Fri, 5 Nov 2021 09:31:08 +0100 From: Stefano Garzarella To: Jason Wang Cc: virtualization , Parav Pandit , "Michael S. Tsirkin" , linux-kernel Subject: Re: [PATCH] vdpa: add driver_override support Message-ID: <20211105083108.kfubtzdbucs2drzs@steredhat> References: <20211104161729.258294-1-sgarzare@redhat.com> <20211105080454.wpvtwa7el45kayem@steredhat> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Nov 05, 2021 at 04:26:44PM +0800, Jason Wang wrote: >On Fri, Nov 5, 2021 at 4:05 PM Stefano Garzarella wrote: >> >> On Fri, Nov 05, 2021 at 11:01:30AM +0800, Jason Wang wrote: >> >On Fri, Nov 5, 2021 at 12:17 AM Stefano Garzarella wrote: >> >> >> >> `driver_override` allows to control which of the vDPA bus drivers >> >> binds to a vDPA device. >> >> >> >> If `driver_override` is not set, the previous behaviour is followed: >> >> devices use the first vDPA bus driver loaded (unless auto binding >> >> is disabled). >> >> >> >> Tested on Fedora 34 with driverctl(8): >> >> $ modprobe virtio-vdpa >> >> $ modprobe vhost-vdpa >> >> $ modprobe vdpa-sim-net >> >> >> >> $ vdpa dev add mgmtdev vdpasim_net name dev1 >> >> >> >> # dev1 is attached to the first vDPA bus driver loaded >> >> $ driverctl -b vdpa list-devices >> >> dev1 virtio_vdpa >> >> >> >> $ driverctl -b vdpa set-override dev1 vhost_vdpa >> >> >> >> $ driverctl -b vdpa list-devices >> >> dev1 vhost_vdpa [*] >> >> >> >> Note: driverctl(8) integrates with udev so the binding is >> >> preserved. >> >> >> >> Suggested-by: Jason Wang >> >> Signed-off-by: Stefano Garzarella >> >> --- >> >> include/linux/vdpa.h | 2 ++ >> >> drivers/vdpa/vdpa.c | 74 ++++++++++++++++++++++++++++++++++++++++++++ >> >> 2 files changed, 76 insertions(+) >> >> >> >> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h >> >> index c3011ccda430..ae34015b37b7 100644 >> >> --- a/include/linux/vdpa.h >> >> +++ b/include/linux/vdpa.h >> >> @@ -64,6 +64,7 @@ struct vdpa_mgmt_dev; >> >> * struct vdpa_device - representation of a vDPA device >> >> * @dev: underlying device >> >> * @dma_dev: the actual device that is performing DMA >> >> + * @driver_override: driver name to force a match >> > >> >This seems useless? >> >> I'm a bit lost, do you mean we should remove the documentation of >> `driver_override`? > >I misread the code which was misled by vdpa_mgmt_dev above:( Yeah, the same thing happened to me now while double checking ;-) > >The code should be fine. > >So: > >Acked-by: Jason Wang > Thanks, Stefano