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io_uring/zcrx: use dma_len for chunk size calculation

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Buffers are now dma-mapped earlier and we can sg_dma_len(), otherwise,
since it's walking with for_each_sgtable_dma_sg(), it might wrongfully
reject some configurations. As a bonus, it'd now be able to use larger
chunks if dma addresses are coalesced e.g by iommu.

Fixes: 8c0cab0b7bf7 ("io_uring/zcrx: always dma map in advance")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/03b219af3f6cfdd1cf64679b8bab7461e47cc123.1774780198.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2026-03-31 22:07:42 +01:00 committed by Jens Axboe
parent 52dcd1776b
commit 7120b87bed
1 changed files with 1 additions and 1 deletions
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io_uring/zcrx.c
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@ -63,7 +63,7 @@ static int io_area_max_shift(struct io_zcrx_mem *mem)
unsigned i;
for_each_sgtable_dma_sg(sgt, sg, i)
shift = min(shift, __ffs(sg->length));
shift = min(shift, __ffs(sg_dma_len(sg)));
return shift;
}