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From: Breno Leitao <[email protected]>
To: [email protected], [email protected], [email protected],
	[email protected], [email protected],
	[email protected]
Cc: [email protected], [email protected],
	[email protected], [email protected],
	[email protected], [email protected]
Subject: [PATCH v4 00/10] io_uring: Initial support for {s,g}etsockopt commands
Date: Mon,  4 Sep 2023 09:24:53 -0700	[thread overview]
Message-ID: <[email protected]> (raw)

This patchset adds support for getsockopt (SOCKET_URING_OP_GETSOCKOPT)
and setsockopt (SOCKET_URING_OP_SETSOCKOPT) in io_uring commands.
SOCKET_URING_OP_SETSOCKOPT implements generic case, covering all levels
and optnames. SOCKET_URING_OP_GETSOCKOPT is limited, for now, to
SOL_SOCKET level, which seems to be the most common level parameter for
get/setsockopt(2).

In order to keep the implementation (and tests) simple, some refactors
were done prior to the changes, as follows:

Patches 1-2: Modify the BPF hooks to support sockptr_t, so, these functions
become flexible enough to accept user or kernel pointers for optval/optlen.

Patch 3-4:  Remove the core {s,g}etsockopt() core function from
__sys_{g,s}etsockopt, so, the code could be reused by other callers,
such as io_uring.

Patch 5: Pass compat mode to the file/socket callbacks

Patch 6: Move io_uring helpers from io_uring_zerocopy_tx to a generic
io_uring headers. This simplify the test case (last patch)

Patch 7: Protect io_uring_cmd_sock() to not be called if CONFIG_NET is
disabled.

PS1: For getsockopt command, the optlen field is not a userspace
pointers, but an absolute value, so this is slightly different from
getsockopt(2) behaviour. The new optlen value is returned in cqe->res.

PS2: The userspace pointers need to be alive until the operation is
completed.

These changes were tested with a new test[1] in liburing, LTP sockopt*
tests, as also with bpf/progs/sockopt test case, which is now adapted to
run using both system calls and io_uring commands.

[1] Link: https://github.com/leitao/liburing/blob/getsockopt/test/socket-getsetsock-cmd.c

RFC -> V1:
	* Copy user memory at io_uring subsystem, and call proto_ops
	  callbacks using kernel memory
	* Implement all the cases for SOCKET_URING_OP_SETSOCKOPT

V1 -> V2
	* Implemented the BPF part
	* Using user pointers from optval to avoid kmalloc in io_uring part.

V2 -> V3:
	* Break down __sys_setsockopt and reuse the core code, avoiding
	  duplicated code. This removed the requirement to expose
	  sock_use_custom_sol_socket().
	* Added io_uring test to selftests/bpf/sockopt.
	* Fixed compat argument, by passing it to the issue_flags.

V3 -> V4:
	* Rebase on top of commit 1ded5e5a5931b ("net: annotate data-races around sock->ops")
	* Also broke down __sys_setsockopt() to reuse the core function
	  from io_uring.
	* Create a new patch to return -EOPNOTSUPP if CONFIG_NET is
	  disabled
	* Added two SOL_SOCKET tests in bpf/prog_tests/sockopt.c

Breno Leitao (10):
  bpf: Leverage sockptr_t in BPF getsockopt hook
  bpf: Leverage sockptr_t in BPF setsockopt hook
  net/socket: Break down __sys_setsockopt
  net/socket: Break down __sys_getsockopt
  io_uring/cmd: Pass compat mode in issue_flags
  selftests/net: Extract uring helpers to be reusable
  io_uring/cmd: return -EOPNOTSUPP if net is disabled
  io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT
  io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT
  selftests/bpf/sockopt: Add io_uring support

 include/linux/bpf-cgroup.h                    |   9 +-
 include/linux/io_uring.h                      |   1 +
 include/net/sock.h                            |   4 +
 include/uapi/linux/io_uring.h                 |   8 +
 io_uring/uring_cmd.c                          |  55 ++++
 kernel/bpf/cgroup.c                           |  25 +-
 net/core/sock.c                               |   8 -
 net/socket.c                                  | 102 ++++---
 tools/include/io_uring/mini_liburing.h        | 282 ++++++++++++++++++
 .../selftests/bpf/prog_tests/sockopt.c        | 113 ++++++-
 tools/testing/selftests/net/Makefile          |   1 +
 .../selftests/net/io_uring_zerocopy_tx.c      | 268 +----------------
 12 files changed, 544 insertions(+), 332 deletions(-)
 create mode 100644 tools/include/io_uring/mini_liburing.h

-- 
2.34.1


             reply	other threads:[~2023-09-04 16:25 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-04 16:24 Breno Leitao [this message]
2023-09-04 16:24 ` [PATCH v4 01/10] bpf: Leverage sockptr_t in BPF getsockopt hook Breno Leitao
2023-09-04 16:24 ` [PATCH v4 02/10] bpf: Leverage sockptr_t in BPF setsockopt hook Breno Leitao
2023-09-04 16:24 ` [PATCH v4 03/10] net/socket: Break down __sys_setsockopt Breno Leitao
2023-09-04 16:24 ` [PATCH v4 04/10] net/socket: Break down __sys_getsockopt Breno Leitao
2023-09-05  9:36   ` David Laight
2023-09-05 10:29   ` Andy Shevchenko
2023-09-04 16:24 ` [PATCH v4 05/10] io_uring/cmd: Pass compat mode in issue_flags Breno Leitao
2023-09-04 16:24 ` [PATCH v4 06/10] selftests/net: Extract uring helpers to be reusable Breno Leitao
2023-09-04 16:25 ` [PATCH v4 07/10] io_uring/cmd: return -EOPNOTSUPP if net is disabled Breno Leitao
2023-09-05 12:32   ` Gabriel Krisman Bertazi
2023-09-08 17:04     ` Breno Leitao
2023-09-04 16:25 ` [PATCH v4 08/10] io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT Breno Leitao
2023-09-05 12:24   ` Gabriel Krisman Bertazi
2023-09-04 16:25 ` [PATCH v4 09/10] io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT Breno Leitao
2023-09-05 12:24   ` Gabriel Krisman Bertazi
2023-09-04 16:25 ` [PATCH v4 10/10] selftests/bpf/sockopt: Add io_uring support Breno Leitao
2023-09-05 22:49 ` [PATCH v4 00/10] io_uring: Initial support for {s,g}etsockopt commands Jakub Kicinski
2023-09-08 16:55   ` Breno Leitao
2023-10-06 15:45   ` Breno Leitao
2023-10-09 10:11     ` Willem de Bruijn
2023-10-09 13:28       ` Breno Leitao
2023-10-09 16:55         ` Jakub Kicinski

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