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Wed, 22 Mar 2023 07:54:25 -0400 (EDT) From: Thomas Monjalon <thomas@monjalon.net> To: "Huang, Wei" <wei.huang@intel.com> Cc: "dev@dpdk.org" <dev@dpdk.org>, "david.marchand@redhat.com" <david.marchand@redhat.com>, "stable@dpdk.org" <stable@dpdk.org>, "Xu, Rosen" <rosen.xu@intel.com>, "Zhang, Tianfei" <tianfei.zhang@intel.com>, "Zhang, Qi Z" <qi.z.zhang@intel.com> Subject: Re: [PATCH v1] raw/ifpga: remove virtual device unplug operation Date: Wed, 22 Mar 2023 12:54:24 +0100 Message-ID: <5367342.29KlJPOoH8@thomas> In-Reply-To: <DM6PR11MB3530B0A55D11406EDE6CF9B9EF869@DM6PR11MB3530.namprd11.prod.outlook.com> References: <20230316204445.360330-1-wei.huang@intel.com> <2637984.KRxA6XjA2N@thomas> <DM6PR11MB3530B0A55D11406EDE6CF9B9EF869@DM6PR11MB3530.namprd11.prod.outlook.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org 22/03/2023 02:26, Huang, Wei: > From: Thomas Monjalon <thomas@monjalon.net> > > 21/03/2023 09:41, Huang, Wei: > > > From: Thomas Monjalon <thomas@monjalon.net> > > > > 21/03/2023 01:11, Huang, Wei: > > > > > From: Thomas Monjalon <thomas@monjalon.net> > > > > > > 16/03/2023 21:44, Wei Huang: > > > > > > > VDEV bus has implemented cleanup() function to perform cleanup > > > > > > > for devices on the bus during eal_cleanup(), so there is no > > > > > > > need for ifpga driver to record virtual devices and unplug them. > > > > > > > > > > > > Why no need? > > > > > > If the application wants to explicitly remove a device, what happens? > > > > > > > > > > > > > > > > > EAL will output an error information "Cannot find plugged device (%s)". > > > > > > > > It does not look what we expect. > > > > > > > Let me clear it. > > > With this patch, no error information will be outputted. > > > Without this patch, error information will be outputted. > > > Because bus cleanup action will unplug virtual device, then ifpga PMD > > > unplug the virtual device which is already be cleanup, > > > > Why ipfga unplug the device after the bus cleanup? > > I'm not following. > > > The virtual device is created upon ifpga, if VDEV bus doesn't perform cleanup, > ifpga has the responsibility to unplug these virtual devices. Really I don't understand the flow. Are you talking about EAL cleanup case? What happens first? Do you need ifpga to be called first? I think you need the correct checks to allow any order of cleanup. > > > bus->find_device() returns NULL, > > > EAL output "Cannot find plugged device (%s)\n" at line 302 in > > > eal_common_dev.c > > > > Anyway, the good answer is not to completely remove the "remove" > > operation. > > > If not to completely remove the "remove", the same virtual device will be unplug twice, is it reasonable? You need to add a check to not unplug something already unplugged. But you must allow the user calling "remove" directly.