[PATCH 5.15 203/230] xsk: Clear page contiguity bit when unmapping pool

From: Greg Kroah-Hartman
Date: Mon Jul 11 2022 - 06:02:31 EST

From: Ivan Malov <ivan.malov@xxxxxxxxxxxx>

[ Upstream commit 512d1999b8e94a5d43fba3afc73e774849674742 ]

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@xxxxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Link: https://lore.kernel.org/bpf/20220628091848.534803-1-ivan.malov@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
net/xdp/xsk_buff_pool.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index fc7fbfc1e586..ccedbbd27692 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -326,6 +326,7 @@ 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_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE,
*dma = 0;