On Mon, Apr 17, 2023 at 11:27:50AM +0800, Xuan Zhuo wrote:
> @@ -532,9 +545,9 @@ struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool)
> xskb->xdp.data_meta = xskb->xdp.data;
>
> if (pool->dma_need_sync) {
> - dma_sync_single_range_for_device(pool->dev, xskb->dma, 0,
> - pool->frame_len,
> - DMA_BIDIRECTIONAL);
> + pool->dma_ops.sync_single_range_for_device(pool->dev, xskb->dma, 0,
> + pool->frame_len,
> + DMA_BIDIRECTIONAL);
> }
> return &xskb->xdp;
> }
> @@ -670,15 +683,15 @@ EXPORT_SYMBOL(xp_raw_get_dma);
>
> void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb)
> {
> - dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
> - xskb->pool->frame_len, DMA_BIDIRECTIONAL);
> + xskb->pool->dma_ops.sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
> + xskb->pool->frame_len, DMA_BIDIRECTIONAL);
> }
> EXPORT_SYMBOL(xp_dma_sync_for_cpu_slow);
>
> void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
> size_t size)
> {
> - dma_sync_single_range_for_device(pool->dev, dma, 0,
> - size, DMA_BIDIRECTIONAL);
> + pool->dma_ops.sync_single_range_for_device(pool->dev, dma, 0,
> + size, DMA_BIDIRECTIONAL);
> }
> EXPORT_SYMBOL(xp_dma_sync_for_device_slow);
So you add an indirect function call on data path? Won't this be costly?
> --
> 2.32.0.3.g01195cf9f
