From patchwork Wed Jun 2 08:45:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhu Lingshan X-Patchwork-Id: 453946 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 7366EC47092 for ; Wed, 2 Jun 2021 08:52:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56D9E61246 for ; Wed, 2 Jun 2021 08:52:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232880AbhFBIxl (ORCPT ); Wed, 2 Jun 2021 04:53:41 -0400 Received: from mga05.intel.com ([192.55.52.43]:29880 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232852AbhFBIxg (ORCPT ); Wed, 2 Jun 2021 04:53:36 -0400 IronPort-SDR: 8yc/Um/296r70J7jdjV5dxWG7SpcrZhYW3WRxW4xIoSE2zwRJWkMYjNqiIAtqb7br417yk2Bpr /vd5f7FXxr5w== X-IronPort-AV: E=McAfee;i="6200,9189,10002"; a="289368388" X-IronPort-AV: E=Sophos;i="5.83,241,1616482800"; d="scan'208";a="289368388" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jun 2021 01:51:54 -0700 IronPort-SDR: ei4V3d31jN+D2Qq/IdxgxhfomvQinCQg9UBA2Mn4PJ2rtIK5ixbH5EXHJd9lcNMtNfVrh4M2Yt zMhgKG8ViAUA== X-IronPort-AV: E=Sophos;i="5.83,241,1616482800"; d="scan'208";a="479628292" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.192.107]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Jun 2021 01:51:51 -0700 From: Zhu Lingshan To: jasowang@redhat.com, mst@redhat.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, Zhu Lingshan Subject: [RESEND PATCH V4 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf Date: Wed, 2 Jun 2021 16:45:50 +0800 Message-Id: <20210602084550.289599-3-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210602084550.289599-1-lingshan.zhu@intel.com> References: <20210602084550.289599-1-lingshan.zhu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This commit implements doorbell mapping feature for ifcvf. This feature maps the notify page to userspace, to eliminate vmexit when kick a vq. Signed-off-by: Zhu Lingshan --- drivers/vdpa/ifcvf/ifcvf_main.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index ab0ab5cf0f6e..46a992eab3e5 100644 --- a/drivers/vdpa/ifcvf/ifcvf_main.c +++ b/drivers/vdpa/ifcvf/ifcvf_main.c @@ -413,6 +413,21 @@ static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev, return vf->vring[qid].irq; } +static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev, + u16 idx) +{ + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); + struct vdpa_notification_area area; + + area.addr = vf->vring[idx].notify_pa; + if (!vf->notify_off_multiplier) + area.size = PAGE_SIZE; + else + area.size = vf->notify_off_multiplier; + + return area; +} + /* * IFCVF currently does't have on-chip IOMMU, so not * implemented set_map()/dma_map()/dma_unmap() @@ -440,6 +455,7 @@ static const struct vdpa_config_ops ifc_vdpa_ops = { .get_config = ifcvf_vdpa_get_config, .set_config = ifcvf_vdpa_set_config, .set_config_cb = ifcvf_vdpa_set_config_cb, + .get_vq_notification = ifcvf_get_vq_notification, }; static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)