From patchwork Tue Jun 1 08:45:02 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 12290731 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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 7ADC7C4708F for ; Tue, 1 Jun 2021 08:45:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5D8B26138C for ; Tue, 1 Jun 2021 08:45:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233645AbhFAIrT (ORCPT ); Tue, 1 Jun 2021 04:47:19 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31644 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233471AbhFAIrM (ORCPT ); Tue, 1 Jun 2021 04:47:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622537130; 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=WrB6mvofF/eyGV52SKIt7JTVB1esFhxct19/WhmLXiU=; b=aHG+6lyPQjSMzlSsJEQAAONYoHswJC28or+6ucxWm7ds9V6oIUwE5oAFAwe7vwNpfWsZob JE7KgCSj9Z6DxQYPRnoaxzdFh/WfJ08bpbN4z662BVSHhKSsV3KuT1mXkyDq0T4YcvtjZZ jh/32L2c25LGPvMKpuV71rnSZmvvKtM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-325-p9zeVaMKOt2wE7gdk0fP-w-1; Tue, 01 Jun 2021 04:45:29 -0400 X-MC-Unique: p9zeVaMKOt2wE7gdk0fP-w-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 29C14802E80; Tue, 1 Jun 2021 08:45:28 +0000 (UTC) Received: from localhost.localdomain (ovpn-12-16.pek2.redhat.com [10.72.12.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id AEBAC1037F21; Tue, 1 Jun 2021 08:45:25 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, netdev@vger.kernel.org Cc: eli@mellanox.com Subject: [PATCH 3/4] vp_vdpa: allow set vq state to initial state after reset Date: Tue, 1 Jun 2021 16:45:02 +0800 Message-Id: <20210601084503.34724-4-jasowang@redhat.com> In-Reply-To: <20210601084503.34724-1-jasowang@redhat.com> References: <20210601084503.34724-1-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org We used to fail the set_vq_state() since it was not supported yet by the virtio spec. But if the bus tries to set the state which is equal to the device initial state after reset, we can let it go. This is a must for virtio_vdpa() to set vq state during probe which is required for some vDPA parents. Signed-off-by: Jason Wang --- drivers/vdpa/virtio_pci/vp_vdpa.c | 42 ++++++++++++++++++++++++++++--- 1 file changed, 39 insertions(+), 3 deletions(-) diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c index c76ebb531212..18bf4a422772 100644 --- a/drivers/vdpa/virtio_pci/vp_vdpa.c +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c @@ -210,13 +210,49 @@ static int vp_vdpa_get_vq_state(struct vdpa_device *vdpa, u16 qid, return -EOPNOTSUPP; } +static int vp_vdpa_set_vq_state_split(struct vdpa_device *vdpa, + const struct vdpa_vq_state *state) +{ + const struct vdpa_vq_state_split *split = &state->split; + + if (split->avail_index == 0) + return 0; + + return -EOPNOTSUPP; +} + +static int vp_vdpa_set_vq_state_packed(struct vdpa_device *vdpa, + const struct vdpa_vq_state *state) +{ + const struct vdpa_vq_state_packed *packed = &state->packed; + + if (packed->last_avail_counter == 1 && + packed->last_avail_idx == 0 && + packed->last_used_counter == 1 && + packed->last_used_idx == 0) + return 0; + + return -EOPNOTSUPP; +} + static int vp_vdpa_set_vq_state(struct vdpa_device *vdpa, u16 qid, const struct vdpa_vq_state *state) { - /* Note that this is not supported by virtio specification, so - * we return -ENOPOTSUPP here. This means we can't support live - * migration, vhost device start/stop. + struct virtio_pci_modern_device *mdev = vdpa_to_mdev(vdpa); + + /* Note that this is not supported by virtio specification. + * But if the state is by chance equal to the device initial + * state, we can let it go. */ + if ((vp_modern_get_status(mdev) & VIRTIO_CONFIG_S_FEATURES_OK) && + !vp_modern_get_queue_enable(mdev, qid)) { + if (vp_modern_get_driver_features(mdev) & + BIT_ULL(VIRTIO_F_RING_PACKED)) + return vp_vdpa_set_vq_state_packed(vdpa, state); + else + return vp_vdpa_set_vq_state_split(vdpa, state); + } + return -EOPNOTSUPP; }