[dpdk-test-report] |WARNING| pw98589 [PATCH] [v1, 1/1] vfio: add page-by-page mapping API

[dpdklab@iol.unh.edu]

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Test-Label: iol-testing
Test-Status: WARNING
http://dpdk.org/patch/98589

_apply patch failure_

Submitter: Burakov, Anatoly <anatoly.burakov@intel.com>
Date: Friday, September 10 2021 11:27:35 
Applied on: CommitID:b344eb5d941a7522ff27b6b7b5419f68c3fea9a0
Apply patch set 98589 failed:

Checking patch lib/eal/freebsd/eal.c...
Checking patch lib/eal/include/rte_vfio.h...
Checking patch lib/eal/linux/eal_vfio.c...
error: while searching for:

static int
container_dma_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
		uint64_t len)
{
	struct user_mem_map *new_map;
	struct user_mem_maps *user_mem_maps;
	bool has_partial_unmap;
	int ret = 0;

	user_mem_maps = &vfio_cfg->mem_maps;

error: patch failed: lib/eal/linux/eal_vfio.c:1872
error: while searching for:
		ret = -1;
		goto out;
	}
	/* map the entry */
	if (vfio_dma_mem_map(vfio_cfg, vaddr, iova, len, 1)) {
		/* technically, this will fail if there are currently no devices
		 * plugged in, even if a device were added later, this mapping
		 * might have succeeded. however, since we cannot verify if this
		 * is a valid mapping without having a device attached, consider
		 * this to be unsupported, because we can't just store any old
		 * mapping and pollute list of active mappings willy-nilly.
		 */
		RTE_LOG(ERR, EAL, "Couldn't map new region for DMA\n");
		ret = -1;
		goto out;
	}
	/* do we have partial unmap support? */
	has_partial_unmap = vfio_cfg->vfio_iommu_type->partial_unmap;


error: patch failed: lib/eal/linux/eal_vfio.c:1887
error: while searching for:
	new_map->addr = vaddr;
	new_map->iova = iova;
	new_map->len = len;
	/* for IOMMU types supporting partial unmap, we don't need chunking */
	new_map->chunk = has_partial_unmap ? 0 : len;

	compact_user_maps(user_mem_maps);
out:

error: patch failed: lib/eal/linux/eal_vfio.c:1908
Hunk #4 succeeded at 2061 (offset -147 lines).
Hunk #5 succeeded at 2203 (offset -147 lines).
Checking patch lib/eal/version.map...
Checking patch lib/eal/windows/eal.c...
Applied patch lib/eal/freebsd/eal.c cleanly.
Applied patch lib/eal/include/rte_vfio.h cleanly.
Applying patch lib/eal/linux/eal_vfio.c with 3 rejects...
Rejected hunk #1.
Rejected hunk #2.
Rejected hunk #3.
Hunk #4 applied cleanly.
Hunk #5 applied cleanly.
Applied patch lib/eal/version.map cleanly.
Applied patch lib/eal/windows/eal.c cleanly.
diff a/lib/eal/linux/eal_vfio.c b/lib/eal/linux/eal_vfio.c	(rejected hunks)
@@ -1872,11 +1872,12 @@ vfio_dma_mem_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
 
 static int
 container_dma_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
-		uint64_t len)
+		uint64_t len, uint64_t pagesz)
 {
 	struct user_mem_map *new_map;
 	struct user_mem_maps *user_mem_maps;
 	bool has_partial_unmap;
+	uint64_t chunk_size;
 	int ret = 0;
 
 	user_mem_maps = &vfio_cfg->mem_maps;
@@ -1887,19 +1888,37 @@ container_dma_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
 		ret = -1;
 		goto out;
 	}
-	/* map the entry */
-	if (vfio_dma_mem_map(vfio_cfg, vaddr, iova, len, 1)) {
-		/* technically, this will fail if there are currently no devices
-		 * plugged in, even if a device were added later, this mapping
-		 * might have succeeded. however, since we cannot verify if this
-		 * is a valid mapping without having a device attached, consider
-		 * this to be unsupported, because we can't just store any old
-		 * mapping and pollute list of active mappings willy-nilly.
-		 */
-		RTE_LOG(ERR, EAL, "Couldn't map new region for DMA\n");
-		ret = -1;
-		goto out;
+
+	/* technically, mapping will fail if there are currently no devices
+	 * plugged in, even if a device were added later, this mapping might
+	 * have succeeded. however, since we cannot verify if this is a valid
+	 * mapping without having a device attached, consider this to be
+	 * unsupported, because we can't just store any old mapping and pollute
+	 * list of active mappings willy-nilly.
+	 */
+
+	/* if page size was not specified, map the entire segment in one go */
+	if (pagesz == 0) {
+		if (vfio_dma_mem_map(vfio_cfg, vaddr, iova, len, 1)) {
+			RTE_LOG(ERR, EAL, "Couldn't map new region for DMA\n");
+			ret = -1;
+			goto out;
+		}
+	} else {
+		/* otherwise, do mappings page-by-page */
+		uint64_t offset;
+
+		for (offset = 0; offset < len; offset += pagesz) {
+			uint64_t va = vaddr + offset;
+			uint64_t io = iova + offset;
+			if (vfio_dma_mem_map(vfio_cfg, va, io, pagesz, 1)) {
+				RTE_LOG(ERR, EAL, "Couldn't map new region for DMA\n");
+				ret = -1;
+				goto out;
+			}
+		}
 	}
+
 	/* do we have partial unmap support? */
 	has_partial_unmap = vfio_cfg->vfio_iommu_type->partial_unmap;
 
@@ -1908,8 +1927,18 @@ container_dma_map(struct vfio_config *vfio_cfg, uint64_t vaddr, uint64_t iova,
 	new_map->addr = vaddr;
 	new_map->iova = iova;
 	new_map->len = len;
-	/* for IOMMU types supporting partial unmap, we don't need chunking */
-	new_map->chunk = has_partial_unmap ? 0 : len;
+
+	/*
+	 * Chunking essentially serves largely the same purpose as page sizes,
+	 * so for the purposes of this calculation, we treat them as the same.
+	 * The reason we have page sizes is because we want to map things in a
+	 * way that allows us to partially unmap later. Therefore, when IOMMU
+	 * supports partial unmap, page size is irrelevant and can be ignored.
+	 * For IOMMU that don't support partial unmap, page size is equivalent
+	 * to chunk size.
+	 */
+	chunk_size = pagesz == 0 ? len : pagesz;
+	new_map->chunk = has_partial_unmap ? 0 : chunk_size;
 
 	compact_user_maps(user_mem_maps);
 out:

https://lab.dpdk.org/results/dashboard/patchsets/18675/

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