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Wed, 25 Mar 2026 06:09:21 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: asml.silence@gmail.com, axboe@kernel.dk, netdev@vger.kernel.org Subject: [PATCH io_uring-7.1 v2 4/5] io_uring/zcrx: use dma_len for chunk size calculation Date: Wed, 25 Mar 2026 13:09:21 +0000 Message-ID: X-Mailer: git-send-email 2.53.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: 8c0cab0b7bf76 ("always dma map in advance") Signed-off-by: Pavel Begunkov --- io_uring/zcrx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c index d9174cb31a44..e1d2e1f1b766 100644 --- a/io_uring/zcrx.c +++ b/io_uring/zcrx.c @@ -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; } -- 2.53.0