From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7832C55ABD for ; Mon, 16 Nov 2020 09:51:00 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 296F622314 for ; Mon, 16 Nov 2020 09:51:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iFBBmKte" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 296F622314 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=virtualization-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id C34448562D; Mon, 16 Nov 2020 09:50:59 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b6QagQrh8wV0; Mon, 16 Nov 2020 09:50:57 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 24A978560C; Mon, 16 Nov 2020 09:50:57 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id EA75DC0891; Mon, 16 Nov 2020 09:50:56 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id F2251C07FF for ; Mon, 16 Nov 2020 09:50:54 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id D83028562D for ; Mon, 16 Nov 2020 09:50:54 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kV4jLbpy37Ut for ; Mon, 16 Nov 2020 09:50:54 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by fraxinus.osuosl.org (Postfix) with ESMTPS id 0CD688560C for ; Mon, 16 Nov 2020 09:50:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605520252; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=1tFy2QDhVKk++GXQ1cATriAqBAtzlx74HcCkbk1BOfw=; b=iFBBmKte/L6/xUlGy8hSTKElKdJKfSNZ7JXgLQEGOlREXjbUtqLa7HxwRUc2p7OKIoQ80y VuQUHLt011tVK41/hhYvHLYd8gTPPG+03f3eDu9dfKzyKabWN2dM7GyQGqDfGgFGjzxlzB RoPXOQ2877yAleLik839SoXZhFkr8hI= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-3-bODsbyh9Pwe1rD3vq2vakg-1; Mon, 16 Nov 2020 04:50:48 -0500 X-MC-Unique: bODsbyh9Pwe1rD3vq2vakg-1 Received: by mail-wr1-f70.google.com with SMTP id r15so10924608wrn.15 for ; Mon, 16 Nov 2020 01:50:48 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=1tFy2QDhVKk++GXQ1cATriAqBAtzlx74HcCkbk1BOfw=; b=HUwQYOCmZlgNkBH7kphLFIRo0p0U5gE4194dtMckZsDeoK0wtLQZyTQWW+pN65RpXb SVV1BJ6Z4lzcEL36hsrpyoDrJNMYzRi5cMGswn67pf+0SN1UNzoMKmYvO2jslgRd8g/o EuuddFb0Prktdhj0x1dbb24CJ18oQlq81CIlo/vDG5+2qcbz101BUDKq4dcnfgFRyHwu zj4iUfWNs7Qd8kPFpMUnLpZ7vnyk+9zhZqzh8nnlEkCBTo2/0t6YUdIdTvtG/Oz6ivyW H3fvr9gYPs1Ih1pwS8CALbdndN2T6ndSpJnWOtpIdV5nJA3otE+3Rj79PVnqx/zj3F+C C08Q== X-Gm-Message-State: AOAM530APJ5B/YviYr1ONAO/2NyKxPeGeLDOejN6vJ7Gzm3qAXYefnMM jwbT67L4uTnUDuhEX4VaXtRzMHV1RVUisr0WFdtet8ZAq1h/egqwlmvlNXWY0o8kayuAZZ4tYdF q14/ar/hSBY/+unMDDK2mM7N+L/reFA9Wl6FlckmUxw== X-Received: by 2002:a1c:2b05:: with SMTP id r5mr14438505wmr.179.1605520247241; Mon, 16 Nov 2020 01:50:47 -0800 (PST) X-Google-Smtp-Source: ABdhPJysy4H0AGXU4sqyTmIIkBPHVyFghUL0GznzWcsb550MbEY/P8U+UOZWEvnSZRrYpKJEFvf6wg== X-Received: by 2002:a1c:2b05:: with SMTP id r5mr14438489wmr.179.1605520247024; Mon, 16 Nov 2020 01:50:47 -0800 (PST) Received: from redhat.com (bzq-79-176-118-93.red.bezeqint.net. [79.176.118.93]) by smtp.gmail.com with ESMTPSA id a144sm5284763wmd.47.2020.11.16.01.50.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 01:50:46 -0800 (PST) Date: Mon, 16 Nov 2020 04:50:43 -0500 From: "Michael S. Tsirkin" To: Stefano Garzarella Subject: Re: [PATCH RFC 12/12] vdpa_sim_blk: implement ramdisk behaviour Message-ID: <20201116045029-mutt-send-email-mst@kernel.org> References: <20201113134712.69744-1-sgarzare@redhat.com> <20201113134712.69744-13-sgarzare@redhat.com> MIME-Version: 1.0 In-Reply-To: <20201113134712.69744-13-sgarzare@redhat.com> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: Laurent Vivier , Max Gurtovoy , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, Stefan Hajnoczi , Eli Cohen X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Fri, Nov 13, 2020 at 02:47:12PM +0100, Stefano Garzarella wrote: > The previous implementation wrote only the status of each request. > This patch implements a more accurate block device simulator, > providing a ramdisk-like behavior. > > Also handle VIRTIO_BLK_T_GET_ID request, always answering the > "vdpa_blk_sim" string. Maybe an ioctl to specify the id makes more sense. > Signed-off-by: Stefano Garzarella > --- > drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 151 +++++++++++++++++++++++---- > 1 file changed, 133 insertions(+), 18 deletions(-) > > diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c > index 8e41b3ab98d5..68e74383322f 100644 > --- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c > @@ -7,6 +7,7 @@ > */ > > #include > +#include > #include > > #include "vdpa_sim.h" > @@ -24,10 +25,137 @@ > > static struct vdpasim *vdpasim_blk_dev; > > +static int vdpasim_blk_handle_req(struct vdpasim *vdpasim, > + struct vdpasim_virtqueue *vq) > +{ > + size_t wrote = 0, to_read = 0, to_write = 0; > + struct virtio_blk_outhdr hdr; > + uint8_t status; > + uint32_t type; > + ssize_t bytes; > + loff_t offset; > + int i, ret; > + > + vringh_kiov_cleanup(&vq->riov); > + vringh_kiov_cleanup(&vq->wiov); > + > + ret = vringh_getdesc_iotlb(&vq->vring, &vq->riov, &vq->wiov, > + &vq->head, GFP_ATOMIC); > + if (ret != 1) > + return ret; > + > + for (i = 0; i < vq->wiov.used; i++) > + to_write += vq->wiov.iov[i].iov_len; > + to_write -= 1; /* last byte is the status */ > + > + for (i = 0; i < vq->riov.used; i++) > + to_read += vq->riov.iov[i].iov_len; > + > + bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->riov, &hdr, sizeof(hdr)); > + if (bytes != sizeof(hdr)) > + return 0; > + > + to_read -= bytes; > + > + type = le32_to_cpu(hdr.type); > + offset = le64_to_cpu(hdr.sector) << SECTOR_SHIFT; > + status = VIRTIO_BLK_S_OK; > + > + switch (type) { > + case VIRTIO_BLK_T_IN: > + if (offset + to_write > VDPASIM_BLK_CAPACITY << SECTOR_SHIFT) { > + dev_err(&vdpasim->vdpa.dev, > + "reading over the capacity - offset: 0x%llx len: 0x%lx\n", > + offset, to_write); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + > + bytes = vringh_iov_push_iotlb(&vq->vring, &vq->wiov, > + vdpasim->buffer + offset, > + to_write); > + if (bytes < 0) { > + dev_err(&vdpasim->vdpa.dev, > + "vringh_iov_push_iotlb() error: %ld offset: 0x%llx len: 0x%lx\n", > + bytes, offset, to_write); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + > + wrote += bytes; > + break; > + > + case VIRTIO_BLK_T_OUT: > + if (offset + to_read > VDPASIM_BLK_CAPACITY << SECTOR_SHIFT) { > + dev_err(&vdpasim->vdpa.dev, > + "writing over the capacity - offset: 0x%llx len: 0x%lx\n", > + offset, to_read); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + > + bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->riov, > + vdpasim->buffer + offset, > + to_read); > + if (bytes < 0) { > + dev_err(&vdpasim->vdpa.dev, > + "vringh_iov_pull_iotlb() error: %ld offset: 0x%llx len: 0x%lx\n", > + bytes, offset, to_read); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + break; > + > + case VIRTIO_BLK_T_GET_ID: { > + char id[VIRTIO_BLK_ID_BYTES] = "vdpa_blk_sim"; > + > + bytes = vringh_iov_push_iotlb(&vq->vring, > + &vq->wiov, id, > + VIRTIO_BLK_ID_BYTES); > + if (bytes < 0) { > + dev_err(&vdpasim->vdpa.dev, > + "vringh_iov_push_iotlb() error: %ld\n", bytes); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + > + wrote += bytes; > + break; > + } > + > + default: > + dev_warn(&vdpasim->vdpa.dev, > + "Unsupported request type %d\n", type); > + status = VIRTIO_BLK_S_IOERR; > + break; > + } > + > + /* if VIRTIO_BLK_T_IN or VIRTIO_BLK_T_GET_ID fail, we need to skip > + * the remaining bytes to put the status in the last byte > + */ > + if (to_write - wrote > 0) { > + vringh_iov_push_iotlb(&vq->vring, &vq->wiov, NULL, > + to_write - wrote); > + } > + > + /* last byte is the status */ > + bytes = vringh_iov_push_iotlb(&vq->vring, &vq->wiov, &status, 1); > + if (bytes != 1) > + return 0; > + > + wrote += bytes; > + > + /* Make sure data is wrote before advancing index */ > + smp_wmb(); > + > + vringh_complete_iotlb(&vq->vring, vq->head, wrote); > + > + return ret; > +} > + > static void vdpasim_blk_work(struct work_struct *work) > { > struct vdpasim *vdpasim = container_of(work, struct vdpasim, work); > - u8 status = VIRTIO_BLK_S_OK; > int i; > > spin_lock(&vdpasim->lock); > @@ -41,21 +169,7 @@ static void vdpasim_blk_work(struct work_struct *work) > if (!vq->ready) > continue; > > - while (vringh_getdesc_iotlb(&vq->vring, &vq->riov, &vq->wiov, > - &vq->head, GFP_ATOMIC) > 0) { > - > - int write; > - > - vq->wiov.i = vq->wiov.used - 1; > - write = vringh_iov_push_iotlb(&vq->vring, &vq->wiov, &status, 1); > - if (write <= 0) > - break; > - > - /* Make sure data is wrote before advancing index */ > - smp_wmb(); > - > - vringh_complete_iotlb(&vq->vring, vq->head, write); > - > + while (vdpasim_blk_handle_req(vdpasim, vq) > 0) { > /* Make sure used is visible before rasing the interrupt. */ > smp_wmb(); > > @@ -67,6 +181,7 @@ static void vdpasim_blk_work(struct work_struct *work) > vq->cb(vq->private); > local_bh_enable(); > } > + > } > out: > spin_unlock(&vdpasim->lock); > @@ -84,7 +199,7 @@ static void vdpasim_blk_update_config(struct vdpasim *vdpasim) > config->num_queues = cpu_to_vdpasim16(vdpasim, VDPASIM_BLK_VQ_NUM); > config->min_io_size = cpu_to_vdpasim16(vdpasim, 1); > config->opt_io_size = cpu_to_vdpasim32(vdpasim, 1); > - config->blk_size = cpu_to_vdpasim32(vdpasim, 512); > + config->blk_size = cpu_to_vdpasim32(vdpasim, SECTOR_SIZE); > } > > static int __init vdpasim_blk_init(void) > @@ -100,7 +215,7 @@ static int __init vdpasim_blk_init(void) > attr.device.update_config = vdpasim_blk_update_config; > > attr.work_fn = vdpasim_blk_work; > - attr.buffer_size = PAGE_SIZE; > + attr.buffer_size = VDPASIM_BLK_CAPACITY << SECTOR_SHIFT; > > vdpasim_blk_dev = vdpasim_create(&attr); > if (IS_ERR(vdpasim_blk_dev)) { > -- > 2.26.2 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization