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| author | Ivan Malov <ivan.malov@oktetlabs.ru> | 2022-06-28 12:18:48 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-06-28 22:49:04 +0200 |
| commit | 512d1999b8e94a5d43fba3afc73e774849674742 (patch) | |
| tree | 1620d5c2ea2fa738a2e8ad3041e234e54e05469f /net/xdp | |
| parent | 32df6fe110c443763d6749a758f33a7117ec1270 (diff) | |
| download | linux-512d1999b8e94a5d43fba3afc73e774849674742.tar.bz2 | |
xsk: Clear page contiguity bit when unmapping pool
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: 2b43470add8c ("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
Diffstat (limited to 'net/xdp')
| -rw-r--r-- | net/xdp/xsk_buff_pool.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 87bdd71c7bb6..f70112176b7c 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -332,6 +332,7 @@ static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs) for (i = 0; i < dma_map->dma_pages_cnt; i++) { dma = &dma_map->dma_pages[i]; if (*dma) { + *dma &= ~XSK_NEXT_PG_CONTIG_MASK; dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE, DMA_BIDIRECTIONAL, attrs); *dma = 0; |