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Fri, 26 Mar 2021 01:50:54 +0000 From: "Lu, Wenzhuo" To: "Coyle, David" , "dev@dpdk.org" CC: "stable@dpdk.org" Thread-Topic: [dpdk-dev] [PATCH 3/3] net/i40e: fix segment fault in AVX512 Thread-Index: AQHXFt7kS9hHSGgMPUmW3LYKIBF2PKqFVlQAgBA+zxA= Date: Fri, 26 Mar 2021 01:50:54 +0000 Message-ID: References: <1615512441-17495-1-git-send-email-wenzhuo.lu@intel.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [192.198.147.206] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 51b178e3-6b26-4990-f71d-08d8eff997a5 x-ms-traffictypediagnostic: DM5PR11MB1929: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM5PR11MB1787.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 51b178e3-6b26-4990-f71d-08d8eff997a5 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Mar 2021 01:50:54.0487 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Xn3kb6D0jz/t3KsdBI5DVkPSI3ed8UCiunsWW5D+XEV2gxyrp3B5Y08x7GkLjpOanK5VTOn8NB0gaPMMsDDTrw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR11MB1929 X-OriginatorOrg: intel.com Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH 3/3] net/i40e: fix segment fault in AVX512 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" Hi David, Sorry for the late response. > > + if (!cache) > > + goto normal; >=20 > [DC] Like in IAVF and ICE, should we also check for cache->len =3D=3D 0, = like is > done in Tx path? Not necessary because below code tries to get more buffer is length is not = as long as needed, it covers the case even if the length is 0. > > + /* Initialize the mbufs in vector, process 4 mbufs in one loop */ >=20 > [DC] Comment should say 2 mbufs Thanks. Will correct it. > > _mm512_set1_epi64(RTE_PKTMBUF_HEADROOM); > > + /* Initialize the mbufs in vector, process 4 mbufs in one loop */ >=20 > [DC] Comment should say 8 mbufs Thanks. Will correct it. > > + /** > > + * merge 0 & 1, by casting 0 to 256-bit and inserting 1 > > + * into the high lanes. Similarly for 2 & 3 > > + */ >=20 > [DC] Comment should say "Similarly for 2 & 3, 4 & 5, 6 & 7" Thanks. Will correct it. >=20 > > + vaddr0_1 =3D > > + > > _mm256_inserti128_si256(_mm256_castsi128_si256(vaddr0), > > + vaddr1, 1); >=20 > >=20 > > + /* flush desc with pa dma_addr */ > > + _mm512_store_si512((__m512i *)&rxdp->read, > > dma_addr0_3); > > + _mm512_store_si512((__m512i *)&(rxdp + 4)->read, > > dma_addr4_7); > > + } > > +#endif >=20 > [DC] Again, there's common code here with the avx2 file and also with the > IAVF and ICE PMDs. >=20 > As I said in other reviews, maybe it's not practical to share code across= PMDs. > But might be good to have some common functions within each PMD for > avx2 and avx512 paths Most of the code looks same but not all. In this avx512 file, some avx512 i= nstructions are used to replace the avx2 ones. Let me check if some common code can be saved.