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From: Jonathan Lemon <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Subject: [RFC PATCH v2 06/13] io_uring: Provide driver API for zctap packet buffers.
Date: Tue, 18 Oct 2022 12:15:55 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Introduce 'struct io_zctap_buf', representing a buffer used by
the network drivers, and a pair of get/put functions which are
used to obtain the buffers.

The code for these will be fleshed out in the next patch.

Signed-off-by: Jonathan Lemon <[email protected]>
---
 include/linux/io_uring.h | 35 +++++++++++++++++++++++++++++++++++
 io_uring/zctap.c         | 11 +++++++++++
 2 files changed, 46 insertions(+)

diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index 43bc8a2edccf..c27645ce0efc 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -32,6 +32,13 @@ struct io_uring_cmd {
 	u8		pdu[32]; /* available inline for free use */
 };
 
+struct io_zctap_buf {
+	dma_addr_t	dma;
+	struct page	*page;
+	atomic_t	refcount;
+	u8		_pad[4];
+};
+
 #if defined(CONFIG_IO_URING)
 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 			      struct iov_iter *iter, void *ioucmd);
@@ -44,6 +51,18 @@ void __io_uring_free(struct task_struct *tsk);
 void io_uring_unreg_ringfd(void);
 const char *io_uring_get_opcode(u8 opcode);
 
+struct io_zctap_ifq;
+struct io_zctap_buf *io_zctap_get_buf(struct io_zctap_ifq *ifq);
+void io_zctap_put_buf(struct io_zctap_ifq *ifq, struct io_zctap_buf *buf);
+
+static inline dma_addr_t io_zctap_buf_dma(struct io_zctap_buf *buf)
+{
+	return buf->dma;
+}
+static inline struct page *io_zctap_buf_page(struct io_zctap_buf *buf)
+{
+	return buf->page;
+}
 static inline void io_uring_files_cancel(void)
 {
 	if (current->io_uring) {
@@ -92,6 +111,22 @@ static inline const char *io_uring_get_opcode(u8 opcode)
 {
 	return "";
 }
+static inline dma_addr_t io_zctap_buf_dma(struct io_zctap_buf *buf)
+{
+	return 0;
+}
+static inline struct page *io_zctap_buf_page(struct io_zctap_buf *buf)
+{
+	return NULL;
+}
+static inline struct io_zctap_buf *io_zctap_get_buf(struct io_zctap_ifq *ifq)
+{
+	return NULL;
+}
+void io_zctap_put_buf(struct io_zctap_ifq *ifq, struct io_zctap_buf *buf)
+{
+}
+
 #endif
 
 #endif
diff --git a/io_uring/zctap.c b/io_uring/zctap.c
index af2e871b1b62..46ba0d011250 100644
--- a/io_uring/zctap.c
+++ b/io_uring/zctap.c
@@ -37,6 +37,17 @@ static u64 zctap_mk_page_info(u16 region_id, u16 pgid)
 	return (u64)0xface << 48 | (u64)region_id << 16 | (u64)pgid;
 }
 
+struct io_zctap_buf *io_zctap_get_buf(struct io_zctap_ifq *ifq)
+{
+	return NULL;
+}
+EXPORT_SYMBOL(io_zctap_get_buf);
+
+void io_zctap_put_buf(struct io_zctap_ifq *ifq, struct io_zctap_buf *buf)
+{
+}
+EXPORT_SYMBOL(io_zctap_put_buf);
+
 static void io_remove_ifq_region(struct ifq_region *ifr)
 {
 	struct io_mapped_ubuf *imu;
-- 
2.30.2


  parent reply	other threads:[~2022-10-18 19:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-18 19:15 [RFC PATCH v2 00/13] zero-copy RX for io_uring Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 01/13] io_uring: add zctap ifq definition Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 02/13] netdevice: add SETUP_ZCTAP to the netdev_bpf structure Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 03/13] io_uring: add register ifq opcode Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 04/13] io_uring: create a zctap region for a mapped buffer Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 05/13] io_uring: create page freelist for the ifq region Jonathan Lemon
2022-10-18 19:15 ` Jonathan Lemon [this message]
2022-10-18 19:15 ` [RFC PATCH v2 07/13] io_uring: Allocate the zctap buffers for the device Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 08/13] io_uring: Add zctap buffer get/put functions and refcounting Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 09/13] skbuff: Introduce SKBFL_FIXED_FRAG and skb_fixed() Jonathan Lemon
2022-10-18 19:15 ` [RFC PATCH v2 10/13] io_uring: Allocate a uarg for use by the ifq RX Jonathan Lemon
2022-10-18 19:16 ` [RFC PATCH v2 11/13] io_uring: Define the zctap iov[] returned to the user Jonathan Lemon
2022-10-18 19:16 ` [RFC PATCH v2 12/13] io_uring: add OP_RECV_ZC command Jonathan Lemon
2022-10-18 19:16 ` [RFC PATCH v2 13/13] io_uring: Make remove_ifq_region a delayed work call Jonathan Lemon
2022-10-20  3:35 ` [RFC PATCH v2 00/13] zero-copy RX for io_uring Ziyang Zhang
2022-11-02 23:33   ` Jonathan Lemon

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