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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: DM4PR11MB5518.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: df3fcf19-0bfb-42f9-15f6-08d9827a2060 X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Sep 2021 12:18:48.9329 (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: B/Cd3e99SyA6cZwOm/qyxmrSBtC32s/f2EhH5lVm8z5/JoI+3w3dxfPXX287eB2IFF7ey5ccOCfQYk3YREl7Qg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB2699 X-OriginatorOrg: intel.com Subject: Re: [dpdk-stable] [PATCH v2] net/ixgbe: fix RxQ/TxQ release 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" > -----Original Message----- > From: Julien Meunier > Sent: Tuesday, September 28, 2021 16:13 > To: dev@dpdk.org > Cc: stable@dpdk.org; Richardson, Bruce ; Wang= , Haiyue > > Subject: [PATCH v2] net/ixgbe: fix RxQ/TxQ release >=20 > On the vector implementation, during the tear-down, the mbufs not > drained in the RxQ and TxQ are freed based on an algorithm which > supposed that the number of descriptors is a power of 2 (max_desc). > Based on this hypothesis, this algorithm uses a bitmask in order to > detect an index overflow during the iteration, and to restart the loop > from 0. >=20 > However, there is no such power of 2 requirement in the ixgbe for the > number of descriptors in the RxQ / TxQ. The only requirement is to have > a number correctly aligned. >=20 > If a user requested to configure a number of descriptors which is not a > power of 2, as a consequence, during the tear-down, it was possible to > be in an infinite loop, and to never reach the exit loop condition. >=20 > By removing the bitmask and changing the loop method, we can avoid this > issue, and allow the user to configure a RxQ / TxQ which is not a power > of 2. >=20 > Fixes: c95584dc2b18 ("ixgbe: new vectorized functions for Rx/Tx") > Cc: bruce.richardson@intel.com > Cc: stable@dpdk.org >=20 > Signed-off-by: Julien Meunier > --- > drivers/net/ixgbe/ixgbe_rxtx_vec_common.h | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) >=20 Acked-by: Haiyue Wang > -- > 2.17.1