Re: [PATCH] io_uring: Add io_uring command support for sockets

Greg Kroah-Hartman
2023-06-22T05:20:59Z

On Wed, Jun 21, 2023 at 04:21:26PM -0700, Breno Leitao wrote:
> Enable io_uring commands on network sockets. Create two new
> SOCKET_URING_OP commands that will operate on sockets. Since these
> commands are similar to ioctl, uses the _IO{R,W} helpers to embedded the
> argument size and operation direction. Also allocates a unused ioctl
> chunk for uring command usage.
>
> In order to call ioctl on sockets, use the file_operations->uring_cmd
> callbacks, and map it to a uring socket function, which handles the
> SOCKET_URING_OP accordingly, and calls socket ioctls.
>
> This patches was tested by creating a new test case in liburing.
> Link: https://github.com/leitao/liburing/commit/3340908b742c6a26f662a0679c4ddf9df84ef431
>
> Signed-off-by: Breno Leitao <leitao@debian.org>
> ---

Isn't this a new version of an older patch?

> .../userspace-api/ioctl/ioctl-number.rst | 1 +
> include/linux/io_uring.h | 6 +++++
> include/uapi/linux/io_uring.h | 6 +++++
> io_uring/uring_cmd.c | 27 +++++++++++++++++++
> net/socket.c | 2 ++
> 5 files changed, 42 insertions(+)
>
> diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
> index 4f7b23faebb9..23348636f2ef 100644
> --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> @@ -361,6 +361,7 @@ Code Seq# Include File Comments
> 0xCB 00-1F CBM serial IEC bus in development:
> <mailto:michael.klein@puffin.lb.shuttle.de>
> 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver
> +0xCC A0-BF uapi/linux/io_uring.h io_uring cmd subsystem

This change is nice, but not totally related to this specific one,
shouldn't it be separate?

> 0xCD 01 linux/reiserfs_fs.h
> 0xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices
> 0xCF 02 fs/smb/client/cifs_ioctl.h
> diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
> index 7fe31b2cd02f..d1b20e2a9fb0 100644
> --- a/include/linux/io_uring.h
> +++ b/include/linux/io_uring.h
> @@ -71,6 +71,7 @@ static inline void io_uring_free(struct task_struct *tsk)
> if (tsk->io_uring)
> __io_uring_free(tsk);
> }
> +int uring_sock_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags);
> #else
> static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
> struct iov_iter *iter, void *ioucmd)
> @@ -102,6 +103,11 @@ static inline const char *io_uring_get_opcode(u8 opcode)
> {
> return "";
> }
> +static inline int uring_sock_cmd(struct io_uring_cmd *cmd,
> + unsigned int issue_flags)
> +{
> + return -EOPNOTSUPP;
> +}
> #endif
>
> #endif
> diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
> index 0716cb17e436..e20ba410859d 100644
> --- a/include/uapi/linux/io_uring.h
> +++ b/include/uapi/linux/io_uring.h
> @@ -703,6 +703,12 @@ struct io_uring_recvmsg_out {
> __u32 flags;
> };
>
> +/*
> + * Argument for IORING_OP_URING_CMD when file is a socket
> + */
> +#define SOCKET_URING_OP_SIOCINQ _IOR(0xcc, 0xa0, int)
> +#define SOCKET_URING_OP_SIOCOUTQ _IOR(0xcc, 0xa1, int)
> +
> #ifdef __cplusplus
> }
> #endif
> diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c
> index 5e32db48696d..dcbe6493b03f 100644
> --- a/io_uring/uring_cmd.c
> +++ b/io_uring/uring_cmd.c
> @@ -7,6 +7,7 @@
> #include <linux/nospec.h>
>
> #include <uapi/linux/io_uring.h>
> +#include <uapi/asm-generic/ioctls.h>
>
> #include "io_uring.h"
> #include "rsrc.h"
> @@ -156,3 +157,29 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
> return io_import_fixed(rw, iter, req->imu, ubuf, len);
> }
> EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
> +
> +int uring_sock_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
> +{
> + struct socket *sock = cmd->file->private_data;
> + struct sock *sk = sock->sk;
> + int ret, arg = 0;
> +
> + if (!sk->sk_prot || !sk->sk_prot->ioctl)
> + return -EOPNOTSUPP;
> +
> + switch (cmd->sqe->cmd_op) {
> + case SOCKET_URING_OP_SIOCINQ:
> + ret = sk->sk_prot->ioctl(sk, SIOCINQ, &arg);
> + if (ret)
> + return ret;
> + return arg;
> + case SOCKET_URING_OP_SIOCOUTQ:
> + ret = sk->sk_prot->ioctl(sk, SIOCOUTQ, &arg);
> + if (ret)
> + return ret;
> + return arg;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +EXPORT_SYMBOL_GPL(uring_sock_cmd);

Did you forget the "io_" prefix?

thanks,

greg k-h