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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: MW4PR11MB5774.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5fd74419-5ff5-40bc-3f4b-08d9bde501f4 X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Dec 2021 03:02:32.7042 (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: Q/NioFNfu4V+D/NWRt7vWubWOWdb8TLjr64cqJ+Sq2sjo9bO4rRuV4t9cy/KwwSAQ+pgYkbua0eMIJ4uJXXqXw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1742 X-OriginatorOrg: intel.com 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 > -----Original Message----- > From: Bin Zheng > Sent: Friday, December 10, 2021 4:22 PM > To: dev@dpdk.org > Cc: Wang, Haiyue ; liangma@liangbit.com; > stable@dpdk.org; Rong, Leyi ; Bin Zheng > ; jia.guo@intel.com > Subject: [PATCH v3] net/ixgbe: add vector Rx parameter check >=20 > Under the circumstance that `rx_tail` wrap back to zero and the advance s= peed > of `rx_tail` is greater than `rxrearm_start`, `rx_tail` will catch up wit= h > `rxrearm_start` and surpass it. > This may cause some mbufs be reused by application. >=20 > So we need to make some restrictions to ensure that `rx_tail` will not e= xceed > `rxrearm_start`. >=20 > e.g. >=20 > RDH: 972 RDT: 991 rxrearm_nb: 991 rxrearm_start: 992 rx_tail: 959 > RDH: 1004 RDT: 1023 rxrearm_nb: 991 rxrearm_start: 0 rx_tail: 991 > RDH: 12 RDT: 31 rxrearm_nb: 991 rxrearm_start: 32 rx_tail: 1023 > RDH: 31 RDT: 63 rxrearm_nb: 960 rxrearm_start: 64 rx_tail: 0 > RDH: 95 RDT: 95 rxrearm_nb: 1016 rxrearm_start: 96 rx_tail: 88 > RDH: 95 RDT: 127 rxrearm_nb: 991 rxrearm_start: 128 rx_tail: 95 ... > RDH: 908 RDT: 927 rxrearm_nb: 991 rxrearm_start: 928 rx_tail: 895 > RDH: 940 RDT: 959 rxrearm_nb: 991 rxrearm_start: 960 rx_tail: 927 > RDH: 980 RDT: 991 rxrearm_nb: 991 rxrearm_start: 992 rx_tail: 959 > RDH: 991 RDT: 991 rxrearm_nb: 1026 rxrearm_start: 992 rx_tail: 994 >=20 > when `rx_tail` catches up with `rxrearm_start`, > 2(994 - 992) mbufs be reused by application ! >=20 > Bugzilla ID: 882 > Fixes: 5a3cca342417 ("net/ixgbe: fix vector Rx") > Cc: jia.guo@intel.com > Cc: stable@dpdk.org >=20 > Signed-off-by: Bin Zheng > --- > drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) >=20 > diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c > b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c > index 1eed949495..4654d0adec 100644 > --- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c > +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c > @@ -364,6 +364,17 @@ _recv_raw_pkts_vec(struct ixgbe_rx_queue *rxq, > struct rte_mbuf **rx_pkts, > uint8_t vlan_flags; > uint16_t udp_p_flag =3D 0; /* Rx Descriptor UDP header present */ >=20 > + /* > + * Under the circumstance that `rx_tail` wrap back to zero > + * and the advance speed of `rx_tail` is greater than `rxrearm_start`, > + * `rx_tail` will catch up with `rxrearm_start` and surpass it. > + * This may cause some mbufs be reused by application. > + * > + * So we need to make some restrictions to ensure that > + * `rx_tail` will not exceed `rxrearm_start`. > + */ > + nb_pkts =3D RTE_MIN(nb_pkts, RTE_IXGBE_RXQ_REARM_THRESH); > + > /* nb_pkts has to be floor-aligned to RTE_IXGBE_DESCS_PER_LOOP */ > nb_pkts =3D RTE_ALIGN_FLOOR(nb_pkts, RTE_IXGBE_DESCS_PER_LOOP); >=20 > -- > 2.25.1 Acked-by: Leyi Rong