From patchwork Fri Oct 25 12:22:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13850613 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 15CC82003C1 for ; Fri, 25 Oct 2024 12:24:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729859044; cv=none; b=hKQh0ajHkQ8czIdpTb797206cqqB3vRIVDddq2/E4NbM8Y8xqdO/SzoGokaJavZFU7Di9GWiDd2/OllL4T0SOKUFCf46ZlRdIWYu9gCO724k1Fn9FHFwQxBiw0WzeN3jEpZw0oBOvtRKQMI/64pYdEcWRmpuSgOp1GrR6Pew1rg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729859044; c=relaxed/simple; bh=vABzLKNvlOxdyet/MKsBKs8rtzdGuPcPBOr6mAJI6sM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rvsvKb0J1uXXeK6NQgI+nmyzfv0XFa8aJRvu/cQCUXGyc8EGGveZfV5y+rrWjcmU4M9ZWJKFab09SCOV/gYqfmRps5CYPbOnoV09/Do7iDhtvIVbjXmkSZ92Rlo8Yx00PRQHmUIdJDPmtGHZm+vIWWCK4guI2fOZ5rz7DPJd2jI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=T1tXd1/2; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="T1tXd1/2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729859041; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cywKv9TEoDTr7tj5I18bYRcgvSakRA47XCPWDnlogL0=; b=T1tXd1/2FJBECI3uwkz+wISY0Ko8VKpAREFFWDjWvkTknULakDBGXZc9yg+0NL5wFdszh4 UuhtsVjBlhtZH0xyzA+CFWTe49+Ls1dDbz3ty1n+EVLHTYXLhtc8e1drN38CwdLRoP9o6e Eng6LGiD7/G0oC/Y4auSBvYse4YHX5s= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-164-HydeUNApNS2RR6AwEGz7nw-1; Fri, 25 Oct 2024 08:23:57 -0400 X-MC-Unique: HydeUNApNS2RR6AwEGz7nw-1 Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 281A5191379F; Fri, 25 Oct 2024 12:23:25 +0000 (UTC) Received: from localhost (unknown [10.72.116.106]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 26A4E196BB7D; Fri, 25 Oct 2024 12:23:23 +0000 (UTC) From: Ming Lei To: Jens Axboe , io-uring@vger.kernel.org, Pavel Begunkov Cc: linux-block@vger.kernel.org, Uday Shankar , Akilesh Kailash , Ming Lei Subject: [PATCH V8 6/7] io_uring/uring_cmd: support leasing device kernel buffer to io_uring Date: Fri, 25 Oct 2024 20:22:43 +0800 Message-ID: <20241025122247.3709133-7-ming.lei@redhat.com> In-Reply-To: <20241025122247.3709133-1-ming.lei@redhat.com> References: <20241025122247.3709133-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Add API of io_uring_cmd_lease_kbuf() for driver to lease its kernel buffer to io_uring. The leased buffer can only be consumed by io_uring OPs in group wide, and the uring_cmd has to be one group leader. This way can support generic device zero copy over device buffer in userspace: - create one sqe group - lease one device buffer to io_uring by the group leader of uring_cmd - io_uring member OPs consume this kernel buffer by passing IOSQE_IO_DRAIN which isn't used for group member, and mapped to GROUP_KBUF. - the kernel buffer is returned back after all member OPs are completed Signed-off-by: Ming Lei --- include/linux/io_uring/cmd.h | 7 +++++++ io_uring/uring_cmd.c | 13 +++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index c189d36ad55e..bdf7abfa0d8a 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -60,6 +60,8 @@ void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, /* Execute the request from a blocking context */ void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd); +int io_uring_cmd_lease_kbuf(struct io_uring_cmd *ioucmd, + const struct io_uring_kernel_buf *grp_kbuf); #else static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, struct iov_iter *iter, void *ioucmd) @@ -82,6 +84,11 @@ static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) { } +static inline int io_uring_cmd_lease_kbuf(struct io_uring_cmd *ioucmd, + const struct io_uring_kernel_buf *grp_kbuf) +{ + return -EOPNOTSUPP; +} #endif /* diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 6994f60d7ec7..2c9c2c60c6cd 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -15,6 +15,7 @@ #include "alloc_cache.h" #include "rsrc.h" #include "uring_cmd.h" +#include "kbuf.h" static struct uring_cache *io_uring_async_get(struct io_kiocb *req) { @@ -175,6 +176,18 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, } EXPORT_SYMBOL_GPL(io_uring_cmd_done); +int io_uring_cmd_lease_kbuf(struct io_uring_cmd *ioucmd, + const struct io_uring_kernel_buf *grp_kbuf) +{ + struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); + + if (unlikely(ioucmd->flags & IORING_URING_CMD_FIXED)) + return -EINVAL; + + return io_lease_group_kbuf(req, grp_kbuf); +} +EXPORT_SYMBOL_GPL(io_uring_cmd_lease_kbuf); + static int io_uring_cmd_prep_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe) {