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Mon, 31 May 2021 00:56:10 -0700 (PDT) Received: from wangxiaodeMacBook-Air.local ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 76sm920482pfy.82.2021.05.31.00.56.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 31 May 2021 00:56:10 -0700 (PDT) Subject: Re: [PATCH V2 RESEND 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf To: Zhu Lingshan , mst@redhat.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org References: <20210531073316.363655-1-lingshan.zhu@intel.com> <20210531073316.363655-3-lingshan.zhu@intel.com> From: Jason Wang Message-ID: Date: Mon, 31 May 2021 15:56:06 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.10.2 MIME-Version: 1.0 In-Reply-To: <20210531073316.363655-3-lingshan.zhu@intel.com> Content-Type: text/plain; charset=gbk; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org ÔÚ 2021/5/31 ÏÂÎç3:33, Zhu Lingshan дµÀ: > 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 | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c > index ab0ab5cf0f6e..effb0e549135 100644 > --- a/drivers/vdpa/ifcvf/ifcvf_main.c > +++ b/drivers/vdpa/ifcvf/ifcvf_main.c > @@ -413,6 +413,22 @@ 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_adapter *adapter = vdpa_to_adapter(vdpa_dev); > + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev); > + struct pci_dev *pdev = adapter->pdev; > + struct vdpa_notification_area area; > + > + area.addr = vf->vring[idx].notify_pa; > + area.size = PAGE_SIZE; > + if (area.addr % PAGE_SIZE) > + IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE aligned\n", idx); Let's leave the decision to upper layer by: (see vp_vdpa_get_vq_notification) area.addr = notify_pa; area.size = notify_offset_multiplier; Thanks > + > + return area; > +} > + > /* > * IFCVF currently does't have on-chip IOMMU, so not > * implemented set_map()/dma_map()/dma_unmap() > @@ -440,6 +456,7 @@ 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)