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[2a03:2880:31ff:7::face:b00c]) by smtp.gmail.com with ESMTPSA id qx26-20020a170906fcda00b00982cfe1fe5dsm6835841ejb.65.2023.07.24.07.23.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jul 2023 07:23:49 -0700 (PDT) From: Breno Leitao To: asml.silence@gmail.com, axboe@kernel.dk Cc: io-uring@vger.kernel.org, netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, edumazet@google.com, pabeni@redhat.com, linux-kernel@vger.kernel.org, leit@meta.com Subject: [PATCH 0/3] io_uring: Initial support for {s,g}etsockopt commands Date: Mon, 24 Jul 2023 07:22:33 -0700 Message-Id: <20230724142237.358769-1-leitao@debian.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-1.4 required=5.0 tests=BAYES_00, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H3,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772313309568080778 X-GMAIL-MSGID: 1772313309568080778 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. On the other hand, SOCKET_URING_OP_GETSOCKOPT just implements level SOL_SOCKET case, which seems to be the most common level parameter for get/setsockopt(2). struct proto_ops->setsockopt() uses sockptr instead of userspace pointers, which makes it easy to bind to io_uring. Unfortunately proto_ops->getsockopt() callback uses userspace pointers, except for SOL_SOCKET, which is handled by sk_getsockopt(). Thus, this patchset leverages sk_getsockopt() to implement the SOCKET_URING_OP_GETSOCKOPT case. 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. This patch was tested with a new test[1] in liburing. This patch depends on "io_uring: Add io_uring command support for sockets"[2] [1] Link: https://github.com/leitao/liburing/blob/getsock/test/socket-getsetsock-cmd.c [2] Link: https://lore.kernel.org/all/20230627134424.2784797-1-leitao@debian.org/ Changes from RFC: * Copy user memory at io_uring subsystem, and call proto_ops callbacks using kernel memory * Implement all the cases for SOCKET_URING_OP_SETSOCKOPT Breno Leitao (4): net: expose sock_use_custom_sol_socket io_uring/cmd: Introduce SOCKET_URING_OP_GETSOCKOPT io_uring/cmd: Introduce SOCKET_URING_OP_SETSOCKOPT io_uring/cmd: Extend support beyond SOL_SOCKET include/linux/net.h | 5 +++ include/uapi/linux/io_uring.h | 8 ++++ io_uring/uring_cmd.c | 81 +++++++++++++++++++++++++++++++++++ net/socket.c | 5 --- 4 files changed, 94 insertions(+), 5 deletions(-)