Driver implementation of the spec: http://patches.dpdk.org/project/dpdk/patch/[email protected]/
> -----Original Message----- > From: Amit Prakash Shukla <[email protected]> > Sent: Thursday, September 7, 2023 1:41 PM > To: Chengwen Feng <[email protected]>; Kevin Laatz > <[email protected]>; Bruce Richardson <[email protected]> > Cc: [email protected]; Jerin Jacob Kollanukkaran <[email protected]>; > [email protected]; Vamsi Krishna Attunuru <[email protected]>; > [email protected]; [email protected]; [email protected]; > [email protected]; Nithin Kumar Dabilpuram > <[email protected]>; Anoob Joseph <[email protected]>; Amit > Prakash Shukla <[email protected]>; Morten Brørup > <[email protected]> > Subject: [PATCH v1 1/2] dmadev: offload to free source buffer > > This changeset adds support in DMA library to free source DMA buffer by > hardware. On a supported hardware, application can pass on the mempool > information as part of vchan config when the DMA transfer direction is > configured as RTE_DMA_DIR_MEM_TO_DEV. > > Signed-off-by: Amit Prakash Shukla <[email protected]> > Acked-by: Morten Brørup <[email protected]> > --- > lib/dmadev/rte_dmadev.h | 27 +++++++++++++++++++++++++++ > 1 file changed, 27 insertions(+) > > diff --git a/lib/dmadev/rte_dmadev.h b/lib/dmadev/rte_dmadev.h index > b157ab7600..d6a685907f 100644 > --- a/lib/dmadev/rte_dmadev.h > +++ b/lib/dmadev/rte_dmadev.h > @@ -278,6 +278,13 @@ int16_t rte_dma_next_dev(int16_t start_dev_id); > #define RTE_DMA_CAPA_OPS_COPY_SG RTE_BIT64(33) > /** Support fill operation. */ > #define RTE_DMA_CAPA_OPS_FILL RTE_BIT64(34) > +/** Support for source buffer free for mem to dev transfer. > + * > + * @note Even though the DMA driver has this capability, it may not > +support all > + * mempool drivers. If the mempool is not supported by the DMA driver, > + * rte_dma_vchan_setup() will fail. > + **/ > +#define RTE_DMA_CAPA_MEM_TO_DEV_SOURCE_BUFFER_FREE > RTE_BIT64(35) > /**@}*/ > > /** > @@ -581,6 +588,19 @@ struct rte_dma_vchan_conf { > * @see struct rte_dma_port_param > */ > struct rte_dma_port_param dst_port; > + /** mempool from which source buffer is allocated. mempool info is > used > + * for freeing source buffer by hardware when configured direction is > + * RTE_DMA_DIR_MEM_TO_DEV. To free the source buffer by > hardware, > + * RTE_DMA_OP_FLAG_FREE_SBUF must be set while calling > rte_dma_copy and > + * rte_dma_copy_sg(). > + * > + * @note If the mempool is not supported by the DMA driver, > + * rte_dma_vchan_setup() will fail. > + * > + * @see RTE_DMA_OP_FLAG_FREE_SBUF > + */ > + struct rte_mempool *mem_to_dev_src_buf_pool; > + > }; > > /** > @@ -818,6 +838,13 @@ struct rte_dma_sge { > * capability bit for this, driver should not return error if this flag was > set. > */ > #define RTE_DMA_OP_FLAG_LLC RTE_BIT64(2) > +/** Mem to dev source buffer free flag. > + * Used for freeing source DMA buffer by hardware when the transfer > +direction is > + * configured as RTE_DMA_DIR_MEM_TO_DEV. > + * > + * @see struct rte_dma_vchan_conf::mem_to_dev_src_buf_pool > + */ > +#define RTE_DMA_OP_FLAG_FREE_SBUF RTE_BIT64(3) > /**@}*/ > > /** > -- > 2.25.1
