netdev - [RFC PATCH v3 14/20] net: page pool: add io

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Date: Tue, 19 Dec 2023 13:03:51 -0800
From: David Wei <dw@...idwei.uk>
To: io-uring@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>,
	Pavel Begunkov <asml.silence@...il.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Mina Almasry <almasrymina@...gle.com>
Subject: [RFC PATCH v3 14/20] net: page pool: add io_uring memory provider

From: Pavel Begunkov <asml.silence@...il.com>

Allow creating a special io_uring pp memory providers, which will be for
implementing io_uring zerocopy receive.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Signed-off-by: David Wei <dw@...idwei.uk>
---
 include/net/page_pool/types.h | 1 +
 net/core/page_pool.c          | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h
index fd846cac9fb6..f54ee759e362 100644
--- a/include/net/page_pool/types.h
+++ b/include/net/page_pool/types.h
@@ -129,6 +129,7 @@ struct mem_provider;
 enum pp_memory_provider_type {
 	__PP_MP_NONE, /* Use system allocator directly */
 	PP_MP_DMABUF_DEVMEM, /* dmabuf devmem provider */
+	PP_MP_IOU_ZCRX, /* io_uring zerocopy receive provider */
 };
 
 struct pp_memory_provider_ops {
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 9e3073d61a97..ebf5ff009d9d 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -21,6 +21,7 @@
 #include <linux/ethtool.h>
 #include <linux/netdevice.h>
 #include <linux/genalloc.h>
+#include <linux/io_uring/net.h>
 
 #include <trace/events/page_pool.h>
 
@@ -242,6 +243,11 @@ static int page_pool_init(struct page_pool *pool,
 	case PP_MP_DMABUF_DEVMEM:
 		pool->mp_ops = &dmabuf_devmem_ops;
 		break;
+#if defined(CONFIG_IO_URING)
+	case PP_MP_IOU_ZCRX:
+		pool->mp_ops = &io_uring_pp_zc_ops;
+		break;
+#endif
 	default:
 		err = -EINVAL;
 		goto free_ptr_ring;
-- 
2.39.3