From patchwork Thu Nov 7 11:01:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 13866187 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 F11741373 for ; Thu, 7 Nov 2024 11:02:51 +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=1730977373; cv=none; b=tHQtcRqoflTFg2BSo5o3GMMk+DYrz17Rm70UYNfZo9+Gk2/GssdCp9fO9rcOmon4DOmEqnSBxURKFBF42grW21mlZ3DMgqtBaiTy1wMbRimVVOViysJ4WSm3PIJT6NxsswoQ7umRc5zxPT3RrDUrAT22YCjZpxq/H5anaGNwyM8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730977373; c=relaxed/simple; bh=NZJz+MfkbY392ub/DHGzxgS6cymJL7zcbYfAl3y7Pgk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Y8i84coRj8nThL/Fj3rkMZt82EemFZQlRT8CcQGyRdNd4g6kEN38NQz7kYKWMvkFPN40xjMQeZRaXOxKCYN5QMp+IOwdWdhKNhThkLLmiMX7+BzpA8xK4mqLP0KH183076pKeKhAzx3J2ImPzLmKQR7LxdD2qghIyrgYW+Zptj0= 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=Ips2zOeL; 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="Ips2zOeL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730977371; 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=C1/P1RCfeEfoec5Dd70p3CI65Q7oJutsf47QDyw0okI=; b=Ips2zOeLO1TVZs2Uz5DvDYJl9FlIl8iROi8e8smwVFPkfBnYxm9nyyTFkTf2ianhwLax1E PbrYq+s1AucASrWglWSPO7TmUlkBQYZCKvkoZQXDwQo8vMtKmaD3tEJk/U9k/QaOOopSyg BPoWl/XIwTWiMxSK7ulK8cY3GrSRO3Q= Received: from mx-prod-mc-01.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-400-fa_4EcmFMISrUjoD2tI3gA-1; Thu, 07 Nov 2024 06:02:48 -0500 X-MC-Unique: fa_4EcmFMISrUjoD2tI3gA-1 X-Mimecast-MFC-AGG-ID: fa_4EcmFMISrUjoD2tI3gA Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A7AB21955D58; Thu, 7 Nov 2024 11:02:46 +0000 (UTC) Received: from localhost (unknown [10.72.116.54]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7B826196BC05; Thu, 7 Nov 2024 11:02:45 +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 V10 11/12] io_uring/uring_cmd: support leasing device kernel buffer to io_uring Date: Thu, 7 Nov 2024 19:01:44 +0800 Message-ID: <20241107110149.890530-12-ming.lei@redhat.com> In-Reply-To: <20241107110149.890530-1-ming.lei@redhat.com> References: <20241107110149.890530-1-ming.lei@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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_BUF. - 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 | 10 ++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index 578a3fdf5c71..0997ea247188 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, + struct io_rsrc_node *node); #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, + struct io_rsrc_node *node); +{ + return -EOPNOTSUPP; +} #endif /* diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index b62965f58f30..e7723759cb23 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 +176,15 @@ 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, + struct io_rsrc_node *node) +{ + struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); + + return io_lease_group_kbuf(req, node); +} +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) {