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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: /LyUJQbr33FQ4651tHbX/btwqXybOWL7ja0uZ/PFKKJl1Ad4c5LY9KUBiEunhyJiHIf0v3S3ltcNiAP8jQI18Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR18MB3847 X-Proofpoint-ORIG-GUID: mhhXA7D2LzKsm8alhHufrXdAT_hcwkOm X-Proofpoint-GUID: mhhXA7D2LzKsm8alhHufrXdAT_hcwkOm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-18_09,2023-08-17_02,2023-05-22_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 Anatoly, Marvell CNXK DMA hardware also supports this feature, and it would be a goo= d feature to add. Thanks for introducing the feature. Please see inline. Thanks, Anoob > -----Original Message----- > From: Anatoly Burakov > Sent: Friday, August 11, 2023 9:45 PM > To: dev@dpdk.org; Chengwen Feng ; Kevin > Laatz ; Bruce Richardson > > Cc: Vladimir Medvedkin > Subject: [EXT] [PATCH v1 1/3] dmadev: add inter-domain operations >=20 > External Email >=20 > ---------------------------------------------------------------------- > Add a flag to indicate that a specific device supports inter-domain opera= tions, > and add an API for inter-domain copy and fill. >=20 > Inter-domain operation is an operation that is very similar to regular DM= A > operation, except either source or destination addresses can be in a > different process's address space, indicated by source and destination > handle values. These values are currently meant to be provided by private > drivers' API's. >=20 > This commit also adds a controller ID field into the DMA device API. > This is an arbitrary value that may not be implemented by hardware, but i= t is > meant to represent some kind of device hierarchy. >=20 > Signed-off-by: Vladimir Medvedkin > Signed-off-by: Anatoly Burakov > --- > doc/guides/prog_guide/dmadev.rst | 18 +++++ > lib/dmadev/rte_dmadev.c | 2 + > lib/dmadev/rte_dmadev.h | 133 > +++++++++++++++++++++++++++++++ > lib/dmadev/rte_dmadev_core.h | 12 +++ > 4 files changed, 165 insertions(+) >=20 > +/** > + * @warning > + * @b EXPERIMENTAL: this API may change without prior notice. > + * > + * Enqueue an inter-domain copy operation. > + * > + * This queues up an inter-domain copy operation to be performed by > +hardware, if > + * the 'flags' parameter contains RTE_DMA_OP_FLAG_SUBMIT then trigger > +doorbell > + * to begin this operation, otherwise do not trigger doorbell. > + * > + * The source and destination handle parameters are arbitrary opaque > +values, > + * currently meant to be provided by private device driver API's. If > +the source > + * handle value is meaningful, RTE_DMA_OP_FLAG_SRC_HANDLE flag must > be set. > + * Similarly, if the destination handle value is meaningful, > + * RTE_DMA_OP_FLAG_DST_HANDLE flag must be set. Source and > destination > +handle > + * values are meant to provide information to the hardware about source > +and/or > + * destination PASID for the inter-domain copy operation. > + * > + * @param dev_id > + * The identifier of the device. > + * @param vchan > + * The identifier of virtual DMA channel. > + * @param src > + * The address of the source buffer (if `src_handle` is set, source ad= dress > + * will be in address space of process referred to by source handle). > + * @param dst > + * The address of the destination buffer (if `dst_handle` is set, dest= ination > + * address will be in address space of process referred to by destinat= ion > + * handle). > + * @param length > + * The length of the data to be copied. > + * @param src_handle > + * Source handle value (if used, RTE_DMA_OP_FLAG_SRC_HANDLE flag > must be set). > + * @param dst_handle > + * Destination handle value (if used, RTE_DMA_OP_FLAG_DST_HANDLE > flag must be > + * set). > + * @param flags > + * Flags for this operation. > + * @return > + * - 0..UINT16_MAX: index of enqueued job. > + * - -ENOSPC: if no space left to enqueue. > + * - other values < 0 on failure. > + */ > +__rte_experimental > +static inline int > +rte_dma_copy_inter_dom(int16_t dev_id, uint16_t vchan, rte_iova_t src, > + rte_iova_t dst, uint32_t length, uint16_t src_handle, > + uint16_t dst_handle, uint64_t flags) > +{ [Anoob] Won't this lead to duplication of all datapath APIs? Also, this app= roach assumes that 'inter-domain' operations always support run-time settin= g of 'src_handle' and 'dst_handle' within one DMA channel, which need not b= e supported by all platforms. Can we move this 'src_handle' and 'dst_handle' registration to rte_dma_vcha= n_setup so that the 'src_handle' and 'dst_handle' can be configured in cont= rol path and the existing datapath APIs can work as is. The op flags (that = is proposed) can be used to determine whether 'inter-domain' operation is r= equested. Having a fixed 'src_handle' & 'dst_handle' per vchan would be bet= ter for performance as well.