[PATCH 1/1] io_uring/zcrx: separate niov number from pages

[PATCH 1/1] io_uring/zcrx: separate niov number from pages

[Pavel Begunkov]

A preparation patch that separates the number of pages / folios from
the number of niovs. They will not match in the future to support huge
pages, improved dma mapping and/or larger chunk sizes.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/zcrx.c | 19 ++++++++++---------
 io_uring/zcrx.h |  1 +
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 80d4a6f71d29..0f46e0404c04 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -181,7 +181,7 @@ static void io_zcrx_free_area(struct io_zcrx_area *area)
 	kvfree(area->nia.niovs);
 	kvfree(area->user_refs);
 	if (area->pages) {
-		unpin_user_pages(area->pages, area->nia.num_niovs);
+		unpin_user_pages(area->pages, area->nr_folios);
 		kvfree(area->pages);
 	}
 	kfree(area);
@@ -192,7 +192,7 @@ static int io_zcrx_create_area(struct io_zcrx_ifq *ifq,
 			       struct io_uring_zcrx_area_reg *area_reg)
 {
 	struct io_zcrx_area *area;
-	int i, ret, nr_pages;
+	int i, ret, nr_pages, nr_iovs;
 	struct iovec iov;
 
 	if (area_reg->flags || area_reg->rq_area_token)
@@ -220,27 +220,28 @@ static int io_zcrx_create_area(struct io_zcrx_ifq *ifq,
 		area->pages = NULL;
 		goto err;
 	}
-	area->nia.num_niovs = nr_pages;
+	area->nr_folios = nr_iovs = nr_pages;
+	area->nia.num_niovs = nr_iovs;
 
-	area->nia.niovs = kvmalloc_array(nr_pages, sizeof(area->nia.niovs[0]),
+	area->nia.niovs = kvmalloc_array(nr_iovs, sizeof(area->nia.niovs[0]),
 					 GFP_KERNEL | __GFP_ZERO);
 	if (!area->nia.niovs)
 		goto err;
 
-	area->freelist = kvmalloc_array(nr_pages, sizeof(area->freelist[0]),
+	area->freelist = kvmalloc_array(nr_iovs, sizeof(area->freelist[0]),
 					GFP_KERNEL | __GFP_ZERO);
 	if (!area->freelist)
 		goto err;
 
-	for (i = 0; i < nr_pages; i++)
+	for (i = 0; i < nr_iovs; i++)
 		area->freelist[i] = i;
 
-	area->user_refs = kvmalloc_array(nr_pages, sizeof(area->user_refs[0]),
+	area->user_refs = kvmalloc_array(nr_iovs, sizeof(area->user_refs[0]),
 					GFP_KERNEL | __GFP_ZERO);
 	if (!area->user_refs)
 		goto err;
 
-	for (i = 0; i < nr_pages; i++) {
+	for (i = 0; i < nr_iovs; i++) {
 		struct net_iov *niov = &area->nia.niovs[i];
 
 		niov->owner = &area->nia;
@@ -248,7 +249,7 @@ static int io_zcrx_create_area(struct io_zcrx_ifq *ifq,
 		atomic_set(&area->user_refs[i], 0);
 	}
 
-	area->free_count = nr_pages;
+	area->free_count = nr_iovs;
 	area->ifq = ifq;
 	/* we're only supporting one area per ifq for now */
 	area->area_id = 0;
diff --git a/io_uring/zcrx.h b/io_uring/zcrx.h
index b59c560d5d84..47f1c0e8c197 100644
--- a/io_uring/zcrx.h
+++ b/io_uring/zcrx.h
@@ -15,6 +15,7 @@ struct io_zcrx_area {
 	bool			is_mapped;
 	u16			area_id;
 	struct page		**pages;
+	unsigned long		nr_folios;
 
 	/* freelist */
 	spinlock_t		freelist_lock ____cacheline_aligned_in_smp;
-- 
2.48.1

Re: [PATCH 1/1] io_uring/zcrx: separate niov number from pages

[Jens Axboe]

On Sat, 05 Apr 2025 11:18:29 +0100, Pavel Begunkov wrote:
> A preparation patch that separates the number of pages / folios from
> the number of niovs. They will not match in the future to support huge
> pages, improved dma mapping and/or larger chunk sizes.
> 
> 

Applied, thanks!

[1/1] io_uring/zcrx: separate niov number from pages
      (no commit info)

Best regards,
-- 
Jens Axboe