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Thu, 5 Nov 2020 00:15:49 +0000 From: "Ananyev, Konstantin" To: Olivier Matz , "dev@dpdk.org" CC: "stable@dpdk.org" Thread-Topic: [PATCH] mbuf: fix reset on mbuf free Thread-Index: AQHWssw9/Ru+bbJv2UmxCtlz1ORQn6m4ql1g Date: Thu, 5 Nov 2020 00:15:49 +0000 Message-ID: References: <20201104170007.8026-1-olivier.matz@6wind.com> In-Reply-To: <20201104170007.8026-1-olivier.matz@6wind.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 authentication-results: 6wind.com; dkim=none (message not signed) header.d=none;6wind.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [46.7.39.127] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 6306032a-8d90-4431-6bee-08d8811ff34d x-ms-traffictypediagnostic: BYAPR11MB2903: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6790; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: UCcPcPJpGRBQl6NQalF++2LX6AqGQso7Bp0jU9hoAUng2scz31hPL81tYOxH10q+OFIJf4CcDTxMggrpsJt/+eSc7bKM2IFge1OOPmlaHZ1CBd++cwspOTqttI4UVUGbZ5AePwvDiMYXyrOVkvHXAc+fW6A4ubZiC59zmtAE0PfCg5Brpfb/QNlwEjOAS/Y7La8yLBN/F6h931ybHOxijCk4b3gtod35tEHWHebHvDtcGCLuv0WH9kK+lpLBriohr2/3vbW2ex33ER9cf2BXb05HU9V795NaAZT5PDQbJedpBwXJ3x74n3nayy1HeOTL1Q9PawupCDJnJ5Xfdgn3KQ== 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: BYAPR11MB3301.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6306032a-8d90-4431-6bee-08d8811ff34d X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Nov 2020 00:15:49.7332 (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: rotiFBplc1mU19yKgW1RftiJbCuyYffvzHZ5sirltw2ojqp956exrbML3O/6KRv4MnfojsLsKZuDftk/UuZxlWfrViq+QUN3UTHFHcmdJJE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR11MB2903 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] [PATCH] mbuf: fix reset on mbuf free X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Hi Olivier, =20 > m->nb_seg must be reset on mbuf free whatever the value of m->next, > because it can happen that m->nb_seg is !=3D 1. For instance in this > case: >=20 > m1 =3D rte_pktmbuf_alloc(mp); > rte_pktmbuf_append(m1, 500); > m2 =3D rte_pktmbuf_alloc(mp); > rte_pktmbuf_append(m2, 500); > rte_pktmbuf_chain(m1, m2); > m0 =3D rte_pktmbuf_alloc(mp); > rte_pktmbuf_append(m0, 500); > rte_pktmbuf_chain(m0, m1); >=20 > As rte_pktmbuf_chain() does not reset nb_seg in the initial m1 > segment (this is not required), after this code the mbuf chain > have 3 segments: > - m0: next=3Dm1, nb_seg=3D3 > - m1: next=3Dm2, nb_seg=3D2 > - m2: next=3DNULL, nb_seg=3D1 >=20 > Freeing this mbuf chain will not restore nb_seg=3D1 in the second > segment.=20 Hmm, not sure why is that? You are talking about freeing m1, right? rte_pktmbuf_prefree_seg(struct rte_mbuf *m) { ... if (m->next !=3D NULL) { m->next =3D NULL; m->nb_segs =3D 1; } m1->next !=3D NULL, so it will enter the if() block, and will reset both next and nb_segs. What I am missing here?=20 Thinking in more generic way, that change: - if (m->next !=3D NULL) { - m->next =3D NULL; - m->nb_segs =3D 1; - } + m->next =3D NULL; + m->nb_segs =3D 1; Assumes that it is ok to have an mbuf with nb_seg > 1 and next =3D=3D NULL. Which seems wrong to me. Konstantin >This is expected that mbufs stored in pool have their > nb_seg field set to 1. >=20 > Fixes: 8f094a9ac5d7 ("mbuf: set mbuf fields while in pool") > Cc: stable@dpdk.org >=20 > Signed-off-by: Olivier Matz > --- > lib/librte_mbuf/rte_mbuf.c | 6 ++---- > lib/librte_mbuf/rte_mbuf.h | 12 ++++-------- > 2 files changed, 6 insertions(+), 12 deletions(-) >=20 > diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c > index 8a456e5e64..e632071c23 100644 > --- a/lib/librte_mbuf/rte_mbuf.c > +++ b/lib/librte_mbuf/rte_mbuf.c > @@ -129,10 +129,8 @@ rte_pktmbuf_free_pinned_extmem(void *addr, void *opa= que) >=20 > rte_mbuf_ext_refcnt_set(m->shinfo, 1); > m->ol_flags =3D EXT_ATTACHED_MBUF; > - if (m->next !=3D NULL) { > - m->next =3D NULL; > - m->nb_segs =3D 1; > - } > + m->next =3D NULL; > + m->nb_segs =3D 1; > rte_mbuf_raw_free(m); > } >=20 > diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h > index a1414ed7cd..ef5800c8ef 100644 > --- a/lib/librte_mbuf/rte_mbuf.h > +++ b/lib/librte_mbuf/rte_mbuf.h > @@ -1329,10 +1329,8 @@ rte_pktmbuf_prefree_seg(struct rte_mbuf *m) > return NULL; > } >=20 > - if (m->next !=3D NULL) { > - m->next =3D NULL; > - m->nb_segs =3D 1; > - } > + m->next =3D NULL; > + m->nb_segs =3D 1; >=20 > return m; >=20 > @@ -1346,10 +1344,8 @@ rte_pktmbuf_prefree_seg(struct rte_mbuf *m) > return NULL; > } >=20 > - if (m->next !=3D NULL) { > - m->next =3D NULL; > - m->nb_segs =3D 1; > - } > + m->next =3D NULL; > + m->nb_segs =3D 1; > rte_mbuf_refcnt_set(m, 1); >=20 > return m; > -- > 2.25.1