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[24.6.151.244]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-a9bce3a7eedsm11353188a12.40.2025.01.22.18.47.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Jan 2025 18:47:29 -0800 (PST) Date: Wed, 22 Jan 2025 18:47:25 -0800 From: Joe Damato To: Jason Wang Cc: netdev@vger.kernel.org, gerhard@engleder-embedded.com, leiyang@redhat.com, xuanzhuo@linux.alibaba.com, mkarsten@uwaterloo.ca, "Michael S. Tsirkin" , Eugenio =?iso-8859-1?Q?P=E9rez?= , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "open list:VIRTIO CORE AND NET DRIVERS" , open list Subject: Re: [RFC net-next v3 2/4] virtio_net: Prepare for NAPI to queue mapping Message-ID: Mail-Followup-To: Joe Damato , Jason Wang , netdev@vger.kernel.org, gerhard@engleder-embedded.com, leiyang@redhat.com, xuanzhuo@linux.alibaba.com, mkarsten@uwaterloo.ca, "Michael S. Tsirkin" , Eugenio =?iso-8859-1?Q?P=E9rez?= , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , "open list:VIRTIO CORE AND NET DRIVERS" , open list References: <20250121191047.269844-1-jdamato@fastly.com> <20250121191047.269844-3-jdamato@fastly.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Jan 23, 2025 at 10:40:43AM +0800, Jason Wang wrote: > On Thu, Jan 23, 2025 at 1:41 AM Joe Damato wrote: > > > > On Wed, Jan 22, 2025 at 02:12:46PM +0800, Jason Wang wrote: > > > On Wed, Jan 22, 2025 at 3:11 AM Joe Damato wrote: > > > > > > > > Slight refactor to prepare the code for NAPI to queue mapping. No > > > > functional changes. > > > > > > > > Signed-off-by: Joe Damato > > > > Reviewed-by: Gerhard Engleder > > > > Tested-by: Lei Yang > > > > --- > > > > v2: > > > > - Previously patch 1 in the v1. > > > > - Added Reviewed-by and Tested-by tags to commit message. No > > > > functional changes. > > > > > > > > drivers/net/virtio_net.c | 10 ++++++++-- > > > > 1 file changed, 8 insertions(+), 2 deletions(-) > > > > > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > > > index 7646ddd9bef7..cff18c66b54a 100644 > > > > --- a/drivers/net/virtio_net.c > > > > +++ b/drivers/net/virtio_net.c > > > > @@ -2789,7 +2789,8 @@ static void skb_recv_done(struct virtqueue *rvq) > > > > virtqueue_napi_schedule(&rq->napi, rvq); > > > > } > > > > > > > > -static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) > > > > +static void virtnet_napi_do_enable(struct virtqueue *vq, > > > > + struct napi_struct *napi) > > > > { > > > > napi_enable(napi); > > > > > > Nit: it might be better to not have this helper to avoid a misuse of > > > this function directly. > > > > Sorry, I'm probably missing something here. > > > > Both virtnet_napi_enable and virtnet_napi_tx_enable need the logic > > in virtnet_napi_do_enable. > > > > Are you suggesting that I remove virtnet_napi_do_enable and repeat > > the block of code in there twice (in virtnet_napi_enable and > > virtnet_napi_tx_enable)? > > I think I miss something here, it looks like virtnet_napi_tx_enable() > calls virtnet_napi_do_enable() directly. > > I would like to know why we don't call netif_queue_set_napi() for TX NAPI here? Please see both the cover letter and the commit message of the next commit which addresses this question. TX-only NAPIs do not have NAPI IDs so there is nothing to map.