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xsk: Clear page contiguity bit when unmapping pool
[ Upstream commit512d1999b8
] When a XSK pool gets mapped, xp_check_dma_contiguity() adds bit 0x1 to pages' DMA addresses that go in ascending order and at 4K stride. The problem is that the bit does not get cleared before doing unmap. As a result, a lot of warnings from iommu_dma_unmap_page() are seen in dmesg, which indicates that lookups by iommu_iova_to_phys() fail. Fixes:2b43470add
("xsk: Introduce AF_XDP buffer allocation API") Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/bpf/20220628091848.534803-1-ivan.malov@oktetlabs.ru Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -326,6 +326,7 @@ static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs)
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for (i = 0; i < dma_map->dma_pages_cnt; i++) {
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dma = &dma_map->dma_pages[i];
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if (*dma) {
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*dma &= ~XSK_NEXT_PG_CONTIG_MASK;
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dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE,
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DMA_BIDIRECTIONAL, attrs);
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*dma = 0;
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