[PATCH RFC 9/9] RDMA: Add helpers for DMA-mapping an array of bio_vecs

From: Chuck Lever <cel@kernel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: iommu@lists.linux.dev, linux-rdma@vger.kernel.org,
	Chuck Lever <chuck.lever@oracle.com>
Subject: [PATCH RFC 9/9] RDMA: Add helpers for DMA-mapping an array of bio_vecs
Date: Thu, 19 Oct 2023 11:26:31 -0400	[thread overview]
Message-ID: <169772919129.5232.11342896871510148807.stgit@klimt.1015granger.net> (raw)
In-Reply-To: <169772852492.5232.17148564580779995849.stgit@klimt.1015granger.net>

From: Chuck Lever <chuck.lever@oracle.com>

Cc: iommu@lists.linux.dev
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 include/rdma/ib_verbs.h |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 533ab92684d8..5e205fda90f9 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4220,6 +4220,35 @@ static inline void ib_dma_unmap_sg(struct ib_device *dev,
 	ib_dma_unmap_sg_attrs(dev, sg, nents, direction, 0);
 }
 
+/**
+ * ib_dma_map_sg - Map an array of bio_vecs to DMA addresses
+ * @dev: The device for which the DMA addresses are to be created
+ * @bvecs: The array of bio_vec entries to map
+ * @nents: The number of entries in the array
+ * @direction: The direction of the DMA
+ */
+static inline int ib_dma_map_bvecs(struct ib_device *dev,
+				   struct bio_vec *bvecs, int nents,
+				   enum dma_data_direction direction)
+{
+	return dma_map_bvecs_attrs(dev->dma_device, bvecs, nents, direction, 0);
+}
+
+/**
+ * ib_dma_unmap_bvecs - Unmap a DMA-mapped bio_vec array
+ * @dev: The device for which the DMA addresses were created
+ * @bvecs: The array of bio_vec entries to unmap
+ * @nents: The number of entries in the array
+ * @direction: The direction of the DMA
+ */
+static inline void ib_dma_unmap_bvec(struct ib_device *dev,
+				     struct bio_vec *bvecs, int nents,
+				     enum dma_data_direction direction)
+{
+	if (!ib_uses_virt_dma(dev))
+		dma_unmap_bvecs_attrs(dev->dma_device, bvecs, nents, direction);
+}
+
 /**
  * ib_dma_max_seg_size - Return the size limit of a single DMA transfer
  * @dev: The device to query


