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X-MS-Exchange-CrossTenant-originalarrivaltime: 25 May 2023 08:15:07.6960 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 70e1fb47-1155-421d-87fc-2e58f638b6e0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 1N2v0y50NodgH0nC/5gTZ3rU51UNMkIPm0Z0Lm1rNBmiodR6xO70hnQol8+a2dhKDdmDUCSxRqoi85hLrhLAfg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR18MB5230 X-Proofpoint-ORIG-GUID: y7SEjNH2QYPGo2GzOeJu4yyCdntv-QDH X-Proofpoint-GUID: y7SEjNH2QYPGo2GzOeJu4yyCdntv-QDH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-25_04,2023-05-24_01,2023-05-22_02 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Hi Stephen, Please see inline. Thanks, Anoob > -----Original Message----- > From: Stephen Hemminger > Sent: Thursday, May 25, 2023 12:02 AM > To: Anoob Joseph > Cc: Thomas Monjalon ; Akhil Goyal > ; Jerin Jacob Kollanukkaran ; > Konstantin Ananyev ; Bernard > Iremonger ; Volodymyr Fialko > ; Hemant Agrawal ; > Mattias R=F6nnblom ; Kiran Kumar > Kokkilagadda ; dev@dpdk.org; Olivier Matz > > Subject: [EXT] Re: [PATCH v3 21/22] pdcp: add thread safe processing >=20 > External Email >=20 > ---------------------------------------------------------------------- > On Wed, 24 May 2023 21:31:15 +0530 > Anoob Joseph wrote: >=20 > > From: Volodymyr Fialko > > > > PDCP state has to be guarded for: > > > > - Uplink pre_process: > > - tx_next atomic increment > > > > - Downlink pre_process: > > - rx_deliv - read > > > > - Downlink post_process: > > - rx_deliv, rx_reorder, rx_next - read/write > > - bitmask/reorder buffer - read/write > > > > When application requires thread safe processing, the state variables > > need to be updated atomically. Add config option to select this option > > per entity. > > > > Signed-off-by: Anoob Joseph > > Signed-off-by: Volodymyr Fialko >=20 > NAK > Conditional locking is a bad design pattern. > It leads to lots of problems, and makes it almost impossible for analysis= tools. [Anoob] With PDCP (& most other protocols), we have to update the states at= omically. Application designers would have a choice of either use single th= read or do multi-thread processing. If the library is designed for multi-th= read and if application uses only single thread, then there would be unnece= ssary overheads from library. If library sticks to single-thread and if app= lication needs more threads for scaling, then again it would become a libra= ry issue. Is your issue with providing such an option or is it about how it is implem= ented? IPsec also has a similar challenge and similar per SA configuration = is provided in lib IPsec as well.