mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-21 18:25:26 -04:00
853e892076
The bvec RDMA API maps each bvec individually via dma_map_phys(), requiring an IOTLB sync for each mapping. For large I/O operations with many bvecs, this overhead becomes significant. The two-step IOVA API (dma_iova_try_alloc / dma_iova_link / dma_iova_sync) allocates a contiguous IOVA range upfront, links all physical pages without IOTLB syncs, then performs a single sync at the end. This reduces IOTLB flushes from O(n) to O(1). It also requires only a single output dma_addr_t compared to extra per-input element storage in struct scatterlist. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Link: https://patch.msgid.link/20260128005400.25147-3-cel@kernel.org Signed-off-by: Leon Romanovsky <leon@kernel.org>