[PATCH liburing v2 3/4] zcrx: add basic support

[David Wei <dw@davidwei.uk>]

Add basic support for zcrx with a thin wrapper around
IORING_REGISTER_ZCRX_IFQ and a struct for the refill queue.

Signed-off-by: David Wei <dw@davidwei.uk>
---
 src/include/liburing.h | 12 ++++++++++++
 src/liburing-ffi.map   |  2 ++
 src/liburing.map       |  2 ++
 src/register.c         |  6 ++++++
 4 files changed, 22 insertions(+)

diff --git a/src/include/liburing.h b/src/include/liburing.h
index 49b4edf437b2..6393599cb3bf 100644
--- a/src/include/liburing.h
+++ b/src/include/liburing.h
@@ -132,6 +132,16 @@ struct io_uring {
 	unsigned pad2;
 };
 
+struct io_uring_zcrx_rq {
+	__u32 *khead;
+	__u32 *ktail;
+	__u32 rq_tail;
+	unsigned ring_entries;
+
+	struct io_uring_zcrx_rqe *rqes;
+	void *ring_ptr;
+};
+
 /*
  * Library interface
  */
@@ -265,6 +275,8 @@ int io_uring_register_file_alloc_range(struct io_uring *ring,
 
 int io_uring_register_napi(struct io_uring *ring, struct io_uring_napi *napi);
 int io_uring_unregister_napi(struct io_uring *ring, struct io_uring_napi *napi);
+int io_uring_register_ifq(struct io_uring *ring,
+			  struct io_uring_zcrx_ifq_reg *reg);
 
 int io_uring_register_clock(struct io_uring *ring,
 			    struct io_uring_clock_register *arg);
diff --git a/src/liburing-ffi.map b/src/liburing-ffi.map
index 968ccbc67366..fe14adb6d83f 100644
--- a/src/liburing-ffi.map
+++ b/src/liburing-ffi.map
@@ -227,4 +227,6 @@ LIBURING_2.9 {
 } LIBURING_2.8;
 
 LIBURING_2.10 {
+	global:
+		io_uring_register_ifq;
 } LIBURING_2.9;
diff --git a/src/liburing.map b/src/liburing.map
index 264a94946e90..d1661d9d61f9 100644
--- a/src/liburing.map
+++ b/src/liburing.map
@@ -113,4 +113,6 @@ LIBURING_2.9 {
 } LIBURING_2.8;
 
 LIBURING_2.10 {
+	global:
+		io_uring_register_ifq;
 } LIBURING_2.9;
diff --git a/src/register.c b/src/register.c
index 0fff208cd5f5..99337d13135d 100644
--- a/src/register.c
+++ b/src/register.c
@@ -422,6 +422,12 @@ int io_uring_clone_buffers(struct io_uring *dst, struct io_uring *src)
 	return io_uring_clone_buffers_offset(dst, src, 0, 0, 0, 0);
 }
 
+int io_uring_register_ifq(struct io_uring *ring,
+			  struct io_uring_zcrx_ifq_reg *reg)
+{
+	return do_register(ring, IORING_REGISTER_ZCRX_IFQ, reg, 1);
+}
+
 int io_uring_resize_rings(struct io_uring *ring, struct io_uring_params *p)
 {
 	unsigned sq_head, sq_tail;
-- 
2.43.5