io_uring/net: convert to struct iou_vec

Convert net.c to use struct iou_vec.

Signed-off-by: Pavel Begunkov <[email protected]>
Link: https://lore.kernel.org/r/6437b57dabed44eca708c02e390529c7ed211c78.1741362889.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <[email protected]>

Author: isilence

io_uring/alloc_cache.h

@@ -16,15 +16,6 @@ bool io_alloc_cache_init(struct io_alloc_cache *cache,
 
 void *io_cache_alloc_new(struct io_alloc_cache *cache, gfp_t gfp);
 
-static inline void io_alloc_cache_kasan(struct iovec **iov, int *nr)
-{
-	if (IS_ENABLED(CONFIG_KASAN)) {
-		kfree(*iov);
-		*iov = NULL;
-		*nr = 0;
-	}
-}
-
 static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
 				      void *entry)
 {

io_uring/net.c

@@ -136,11 +136,8 @@ static bool io_net_retry(struct socket *sock, int flags)
 
 static void io_netmsg_iovec_free(struct io_async_msghdr *kmsg)
 {
-	if (kmsg->free_iov) {
-		kfree(kmsg->free_iov);
-		kmsg->free_iov_nr = 0;
-		kmsg->free_iov = NULL;
-	}
+	if (kmsg->vec.iovec)
+		io_vec_free(&kmsg->vec);
 }
 
 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
@@ -154,7 +151,7 @@ static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
 	}
 
 	/* Let normal cleanup path reap it if we fail adding to the cache */
-	io_alloc_cache_kasan(&hdr->free_iov, &hdr->free_iov_nr);
+	io_alloc_cache_vec_kasan(&hdr->vec);
 	if (io_alloc_cache_put(&req->ctx->netmsg_cache, hdr)) {
 		req->async_data = NULL;
 		req->flags &= ~REQ_F_ASYNC_DATA;
@@ -171,7 +168,7 @@ static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req)
 		return NULL;
 
 	/* If the async data was cached, we might have an iov cached inside. */
-	if (hdr->free_iov)
+	if (hdr->vec.iovec)
 		req->flags |= REQ_F_NEED_CLEANUP;
 	return hdr;
 }
@@ -182,10 +179,7 @@ static void io_net_vec_assign(struct io_kiocb *req, struct io_async_msghdr *kmsg
 {
 	if (iov) {
 		req->flags |= REQ_F_NEED_CLEANUP;
-		kmsg->free_iov_nr = kmsg->msg.msg_iter.nr_segs;
-		if (kmsg->free_iov)
-			kfree(kmsg->free_iov);
-		kmsg->free_iov = iov;
+		io_vec_reset_iovec(&kmsg->vec, iov, kmsg->msg.msg_iter.nr_segs);
 	}
 }
 
@@ -208,9 +202,9 @@ static int io_net_import_vec(struct io_kiocb *req, struct io_async_msghdr *iomsg
 	struct iovec *iov;
 	int ret, nr_segs;
 
-	if (iomsg->free_iov) {
-		nr_segs = iomsg->free_iov_nr;
-		iov = iomsg->free_iov;
+	if (iomsg->vec.iovec) {
+		nr_segs = iomsg->vec.nr;
+		iov = iomsg->vec.iovec;
 	} else {
 		nr_segs = 1;
 		iov = &iomsg->fast_iov;
@@ -468,7 +462,7 @@ static int io_bundle_nbufs(struct io_async_msghdr *kmsg, int ret)
 	if (iter_is_ubuf(&kmsg->msg.msg_iter))
 		return 1;
 
-	iov = kmsg->free_iov;
+	iov = kmsg->vec.iovec;
 	if (!iov)
 		iov = &kmsg->fast_iov;
 
@@ -584,9 +578,9 @@ static int io_send_select_buffer(struct io_kiocb *req, unsigned int issue_flags,
 		.nr_iovs = 1,
 	};
 
-	if (kmsg->free_iov) {
-		arg.nr_iovs = kmsg->free_iov_nr;
-		arg.iovs = kmsg->free_iov;
+	if (kmsg->vec.iovec) {
+		arg.nr_iovs = kmsg->vec.nr;
+		arg.iovs = kmsg->vec.iovec;
 		arg.mode = KBUF_MODE_FREE;
 	}
 
@@ -599,9 +593,9 @@ static int io_send_select_buffer(struct io_kiocb *req, unsigned int issue_flags,
 	if (unlikely(ret < 0))
 		return ret;
 
-	if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
-		kmsg->free_iov_nr = ret;
-		kmsg->free_iov = arg.iovs;
+	if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->vec.iovec) {
+		kmsg->vec.nr = ret;
+		kmsg->vec.iovec = arg.iovs;
 		req->flags |= REQ_F_NEED_CLEANUP;
 	}
 	sr->len = arg.out_len;
@@ -1085,9 +1079,9 @@ static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg
 			.mode = KBUF_MODE_EXPAND,
 		};
 
-		if (kmsg->free_iov) {
-			arg.nr_iovs = kmsg->free_iov_nr;
-			arg.iovs = kmsg->free_iov;
+		if (kmsg->vec.iovec) {
+			arg.nr_iovs = kmsg->vec.nr;
+			arg.iovs = kmsg->vec.iovec;
 			arg.mode |= KBUF_MODE_FREE;
 		}
 
@@ -1106,9 +1100,9 @@ static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg
 		}
 		iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, arg.iovs, ret,
 				arg.out_len);
-		if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
-			kmsg->free_iov_nr = ret;
-			kmsg->free_iov = arg.iovs;
+		if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->vec.iovec) {
+			kmsg->vec.nr = ret;
+			kmsg->vec.iovec = arg.iovs;
 			req->flags |= REQ_F_NEED_CLEANUP;
 		}
 	} else {
@@ -1874,8 +1868,7 @@ void io_netmsg_cache_free(const void *entry)
 {
 	struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;
 
-	if (kmsg->free_iov)
-		io_netmsg_iovec_free(kmsg);
+	io_vec_free(&kmsg->vec);
 	kfree(kmsg);
 }
 #endif

io_uring/net.h

@@ -2,12 +2,12 @@
 
 #include <linux/net.h>
 #include <linux/uio.h>
+#include <linux/io_uring_types.h>
 
 struct io_async_msghdr {
 #if defined(CONFIG_NET)
-	struct iovec			*free_iov;
-	/* points to an allocated iov, if NULL we use fast_iov instead */
-	int				free_iov_nr;
+	struct iou_vec				vec;
+
 	struct_group(clear,
 		int				namelen;
 		struct iovec			fast_iov;