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a6556b71-063e-44d5-176d-08db6e3558d5 X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Jun 2023 06:46:00.5190 (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: akqNuruGqeHDmWLViGaO1C9ppLPBXm0FLnkxZ0bfDYeRWLoigdDfrU45qd9ryRc9IPqZal9rC3pGcVIgBkixjF55hM1JnC51zOx0oM4OfsY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR18MB4866 X-Proofpoint-GUID: KoAecmYCzgZLjkKBREMCyo0vlh-zUpzF X-Proofpoint-ORIG-GUID: KoAecmYCzgZLjkKBREMCyo0vlh-zUpzF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-16_04,2023-06-15_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 =3D > On Tue, 13 Jun 2023 14:55:48 +0530 > wrote: >=20 > > static __rte_always_inline void > > cn10k_sso_txq_fc_wait(const struct cn10k_eth_txq *txq) > > { > > +#ifdef RTE_ARCH_ARM64 > > + uint64_t space; > > + > > + asm volatile(PLT_CPU_FEATURE_PREAMBLE > > + " ldxr %[space], [%[addr]] \n" > > + " cmp %[adj], %[space] \n" > > + " b.hi .Ldne%=3D \n" > > + " sevl \n" > > + ".Lrty%=3D: wfe \n" > > + " ldxr %[space], [%[addr]] \n" > > + " cmp %[adj], %[space] \n" > > + " b.ls .Lrty%=3D \n" > > + ".Ldne%=3D: \n" > > + : [space] "=3D&r"(space) > > + : [adj] "r"(txq->nb_sqb_bufs_adj), [addr] "r"(txq- > >fc_mem) > > + : "memory"); > > +#else > > while ((uint64_t)txq->nb_sqb_bufs_adj <=3D > > __atomic_load_n(txq->fc_mem, __ATOMIC_RELAXED)) > > ; > > +#endif > > } >=20 > Rather than introduce assembly here, please extend existing rte_pause > functions and then other drivers could benefit and it would fit > existing WFE usage. >=20 Yes, a future patch is planned to replace this and other occurrences with=20 RTE_WAIT_UNTIL_MASKED > Something like: >=20 > static __rte_always_inline void > rte_wait_until_le_32(volatile uint32_t *addr, uint32_t expected, > int memorder); >=20 > Direct assembly in drivers is hard to maintain and should be forbidden.