From: Breno Leitao <leitao@xxxxxxxxxx> Date: Thu, 22 Jun 2023 14:59:14 -0700 > Enable io_uring commands on network sockets. Create two new > SOCKET_URING_OP commands that will operate on sockets. > > In order to call ioctl on sockets, use the file_operations->io_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/tree/io_uring_cmd > > Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> > --- > V1 -> V2: > * Keep uring code outside of network core subsystem > * Uses ioctl to define uring operation > * Use a generic ioctl function, instead of copying it over > V2 -> V3: > * Do not use ioctl() helpers to create uring operations > * Rename uring_sock_cmd to io_uring_cmd_sock > --- > include/linux/io_uring.h | 6 ++++++ > include/uapi/linux/io_uring.h | 8 ++++++++ > io_uring/uring_cmd.c | 27 +++++++++++++++++++++++++++ > net/socket.c | 2 ++ > 4 files changed, 43 insertions(+) > > diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h > index 7fe31b2cd02f..f00baf2929ff 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 io_uring_cmd_sock(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 io_uring_cmd_sock(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..5c25f8c98aa8 100644 > --- a/include/uapi/linux/io_uring.h > +++ b/include/uapi/linux/io_uring.h > @@ -703,6 +703,14 @@ struct io_uring_recvmsg_out { > __u32 flags; > }; > > +/* > + * Argument for IORING_OP_URING_CMD when file is a socket > + */ > +enum { > + SOCKET_URING_OP_SIOCINQ = 0, > + SOCKET_URING_OP_SIOCOUTQ, > +}; > + > #ifdef __cplusplus > } > #endif > diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c > index 5e32db48696d..31ce59567295 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 io_uring_cmd_sock(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; Please cache READ_ONCE(sk->sk_prot) here and reuse it. Thanks. > + > + 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(io_uring_cmd_sock); > diff --git a/net/socket.c b/net/socket.c > index b778fc03c6e0..09b105d00445 100644 > --- a/net/socket.c > +++ b/net/socket.c > @@ -88,6 +88,7 @@ > #include <linux/xattr.h> > #include <linux/nospec.h> > #include <linux/indirect_call_wrapper.h> > +#include <linux/io_uring.h> > > #include <linux/uaccess.h> > #include <asm/unistd.h> > @@ -159,6 +160,7 @@ static const struct file_operations socket_file_ops = { > #ifdef CONFIG_COMPAT > .compat_ioctl = compat_sock_ioctl, > #endif > + .uring_cmd = io_uring_cmd_sock, > .mmap = sock_mmap, > .release = sock_close, > .fasync = sock_fasync, > -- > 2.34.1
