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Start single transaction for size > max SG entry size in SG copy. Default MAX SG entry size is 2000 bytes which is experiment data of mem to mem, user can change it according to experiment: export DPAA_QDMA_SG_MAX_ENTRY_SIZE=xxx Signed-off-by: Jun Yang --- drivers/dma/dpaa/dpaa_qdma.c | 41 ++++++++++++++++++++++++++++++++---- 1 file changed, 37 insertions(+), 4 deletions(-) diff --git a/drivers/dma/dpaa/dpaa_qdma.c b/drivers/dma/dpaa/dpaa_qdma.c index 383142fc75..e3f2777b40 100644 --- a/drivers/dma/dpaa/dpaa_qdma.c +++ b/drivers/dma/dpaa/dpaa_qdma.c @@ -12,6 +12,8 @@ static int s_data_validation; static int s_hw_err_check; static int s_sg_enable = 1; +static uint32_t s_sg_max_entry_sz = 2000; + #ifdef RTE_DMA_DPAA_ERRATA_ERR050757 static int s_pci_read = 1; #endif @@ -761,7 +763,7 @@ fsl_qdma_enqueue_desc_sg(struct fsl_qdma_queue *fsl_queue) struct fsl_qdma_comp_sg_desc *csgf_src, *csgf_dest; struct fsl_qdma_cmpd_ft *ft; uint32_t total_len; - uint16_t start, idx, num, i; + uint16_t start, idx, num, i, next_idx; int ret; #ifdef RTE_DMA_DPAA_ERRATA_ERR050757 struct fsl_qdma_sdf *sdf; @@ -770,13 +772,31 @@ fsl_qdma_enqueue_desc_sg(struct fsl_qdma_queue *fsl_queue) eq_sg: total_len = 0; start = fsl_queue->pending_start; + if (fsl_queue->pending_desc[start].len > s_sg_max_entry_sz || + fsl_queue->pending_num == 1) { + ret = fsl_qdma_enqueue_desc_single(fsl_queue, + fsl_queue->pending_desc[start].dst, + fsl_queue->pending_desc[start].src, + fsl_queue->pending_desc[start].len); + if (!ret) { + fsl_queue->pending_start = + (start + 1) & (fsl_queue->pending_max - 1); + fsl_queue->pending_num--; + } + if (fsl_queue->pending_num > 0) + goto eq_sg; + + return ret; + } + + ret = fsl_qdma_enqueue_overflow(fsl_queue); + if (unlikely(ret)) + return ret; + if (fsl_queue->pending_num > FSL_QDMA_SG_MAX_ENTRY) num = FSL_QDMA_SG_MAX_ENTRY; else num = fsl_queue->pending_num; - ret = fsl_qdma_enqueue_overflow(fsl_queue); - if (unlikely(ret)) - return ret; ft = fsl_queue->ft[fsl_queue->ci]; csgf_src = &ft->desc_sbuf; @@ -799,7 +819,16 @@ fsl_qdma_enqueue_desc_sg(struct fsl_qdma_queue *fsl_queue) ft->desc_dsge[i].length = fsl_queue->pending_desc[idx].len; ft->desc_dsge[i].final = 0; total_len += fsl_queue->pending_desc[idx].len; + if ((i + 1) != num) { + next_idx = (idx + 1) & (fsl_queue->pending_max - 1); + if (fsl_queue->pending_desc[next_idx].len > + s_sg_max_entry_sz) { + num = i + 1; + break; + } + } } + ft->desc_ssge[num - 1].final = 1; ft->desc_dsge[num - 1].final = 1; csgf_src->length = total_len; @@ -1297,6 +1326,10 @@ dpaa_qdma_init(struct rte_dma_dev *dmadev) if (penv) s_sg_enable = atoi(penv); + penv = getenv("DPAA_QDMA_SG_MAX_ENTRY_SIZE"); + if (penv) + s_sg_max_entry_sz = atoi(penv); + #ifdef RTE_DMA_DPAA_ERRATA_ERR050757 penv = getenv("DPAA_QDMA_PCI_READ"); if (penv) -- 2.25.1