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Thu, 14 Dec 2017 14:43:04 +0000 From: Matan Azrad To: =?iso-8859-1?Q?Ga=EBtan_Rivet?= CC: Adrien Mazarguil , Thomas Monjalon , "dev@dpdk.org" , "stable@dpdk.org" Thread-Topic: [PATCH v2 4/4] net/failsafe: fix removed device handling Thread-Index: AQHTdCVqeFZYAzJ0Kk2VOrfpqCAdSKNBZw+wgAAKGACAAGDPgIAA0g4ggAAF+ACAACKyYIAACXmAgAAS5TA= Date: Thu, 14 Dec 2017 14:43:03 +0000 Message-ID: References: <1509637324-13525-1-git-send-email-matan@mellanox.com> <1513175370-16583-1-git-send-email-matan@mellanox.com> <1513175370-16583-5-git-send-email-matan@mellanox.com> <20171213151641.g42zr7zupbsdgxsv@bidouze.vm.6wind.com> <20171213160916.e3rmxmhfhqz72wco@bidouze.vm.6wind.com> <20171213215545.kywwximn2g5xm5x5@bidouze.vm.6wind.com> <20171214104856.d5qgnawuzb54l36z@bidouze.vm.6wind.com> <20171214132701.rwlyymuzvrl3tgsu@bidouze.vm.6wind.com> In-Reply-To: <20171214132701.rwlyymuzvrl3tgsu@bidouze.vm.6wind.com> Accept-Language: en-US, he-IL Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [193.47.165.251] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1; 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DIR:OUT; SFP:1101; SCL:1; SRVR:HE1PR0502MB3660; H:HE1PR0502MB3659.eurprd05.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: mellanox.com does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3a96e438-b02f-48e5-f9dd-08d54300fb70 X-MS-Exchange-CrossTenant-originalarrivaltime: 14 Dec 2017 14:43:03.8933 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0502MB3660 Subject: Re: [dpdk-stable] [PATCH v2 4/4] net/failsafe: fix removed device handling X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Dec 2017 14:43:06 -0000 Hi > -----Original Message----- > From: Ga=EBtan Rivet [mailto:gaetan.rivet@6wind.com] > Sent: Thursday, December 14, 2017 3:27 PM > To: Matan Azrad > Cc: Adrien Mazarguil ; Thomas Monjalon > ; dev@dpdk.org; stable@dpdk.org > Subject: Re: [PATCH v2 4/4] net/failsafe: fix removed device handling >=20 > On Thu, Dec 14, 2017 at 01:07:31PM +0000, Matan Azrad wrote: > > Hi Gaetan > > > > > -----Original Message----- > > > From: Ga=EBtan Rivet [mailto:gaetan.rivet@6wind.com] > > > Sent: Thursday, December 14, 2017 12:49 PM > > > To: Matan Azrad > > > Cc: Adrien Mazarguil ; Thomas Monjalon > > > ; dev@dpdk.org; stable@dpdk.org > > > Subject: Re: [PATCH v2 4/4] net/failsafe: fix removed device > > > handling > > > > > > On Thu, Dec 14, 2017 at 10:40:22AM +0000, Matan Azrad wrote: > > > > Hi Gaetan > > > > > > > >=20 > >=20 > > > > > Ok, actually you were right here to do it this way. The "is_remov= ed" > > > > > check needs to happen after the operation attempt to effectively > > > > > mitigate the possible race. Checking before attempting the call > > > > > will be much less effective. > > > > > > > > > > That being said, would it be cleaner to have eth_dev ops return > > > > > -ENODEV directly, and check against it within fail-safe? > > > > > > > > > > > > > I think that according to "is_removed" semantic we must return a > > > > Boolean > > > value (Each value different from '0' means that the device is > > > removed) like other functions in c library (for example isspace()). > > > > > > > > > > Sure, I wasn't discussing the interface proposed by > > > rte_eth_dev_is_removed(). > > > > > > What I meant was to ask whether checking rte_eth_dev_is_removed() > > > would be more interesting in the ethdev layer, making the > > > eth_dev_ops return -ENODEV regardless of the previous error if this > > > check is supported by the driver and signal that the port is removed. > > > > > > I think this information could be interesting to other systems, not > > > just fail- safe. > > > > > > > Ok. Got you now. > > Interesting approach - plan: > > 1. update fs_link_update to use rte_eth* functions. >=20 > I'm surprised it doesn't already. > Either the rte_eth* function was introduced after the failsafe, or be war= y of > potential issues. I don't see a problem right now though. >=20 > > 2. maybe -EIO is preferred because -ENODEV is used for no port > error? >=20 > Good point, didn't think about it. > Prepare yourself maybe to some arguments about the most relevant error > code. -EIO seems fine to me, but maybe use a wrapper for all this. >=20 > Something like: >=20 > ---8<--- >=20 > static int > eth_error(pid, int original_ret) > { > int ret; >=20 > if (original_ret =3D=3D 0) > return original_ret; > ret =3D rte_eth_is_removed(pid); > if (ret =3D=3D 0 || ret =3D=3D -ENOTSUP) > return original_ret; > return -EIO; > } >=20 > int > rte_eth_ops_xyz(pid) > { > int ret; > ret =3D eth_dev(pid).ops_xyz(); > return eth_error(pid, ret); > } >=20 > --->8--- >=20 > This way you would be able to change it easily and the logic would be > insulated. >=20 Nice. > > 3. update all relevant rte_eth* to use "is_removed" in error flows(1 > patch for flow APIs and 1 for the others). > > 4. Change fs checks in error flows to check rte_eth* return values. > > 5. Remove CC stable from commit massage. > > > > What do you think? > > >=20 > Agreed otherwise. >=20 Will create V3, thanks! > Thanks, >=20 > > > -- > > > Ga=EBtan Rivet > > > 6WIND >=20 > -- > Ga=EBtan Rivet > 6WIND