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[79.179.71.128]) by smtp.gmail.com with ESMTPSA id n4sm4598775wrp.61.2020.09.29.00.21.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Sep 2020 00:21:57 -0700 (PDT) Date: Tue, 29 Sep 2020 03:21:54 -0400 From: "Michael S. Tsirkin" To: Tonghao Zhang Cc: Jason Wang , Willem de Bruijn , virtualization@lists.linux-foundation.org, Linux Kernel Network Developers Subject: Re: [PATCH net v2] virtio-net: don't disable guest csum when disable LRO Message-ID: <20200929031754-mutt-send-email-mst@kernel.org> References: <20200929015806.19171-1-xiangxia.m.yue@gmail.com> <20200929022246-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Tue, Sep 29, 2020 at 02:59:03PM +0800, Tonghao Zhang wrote: > On Tue, Sep 29, 2020 at 2:23 PM Michael S. Tsirkin wrote: > > > > On Tue, Sep 29, 2020 at 09:58:06AM +0800, xiangxia.m.yue@gmail.com wrote: > > > From: Tonghao Zhang > > > > > > Open vSwitch and Linux bridge will disable LRO of the interface > > > when this interface added to them. Now when disable the LRO, the > > > virtio-net csum is disable too. That drops the forwarding performance. > > > > > > Fixes: a02e8964eaf9 ("virtio-net: ethtool configurable LRO") > > > Cc: Michael S. Tsirkin > > > Cc: Jason Wang > > > Cc: Willem de Bruijn > > > Signed-off-by: Tonghao Zhang > > > --- > > > v2: > > > * change the fix-tag > > > --- > > > drivers/net/virtio_net.c | 8 +++++++- > > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > > index 7145c83c6c8c..21b71148c532 100644 > > > --- a/drivers/net/virtio_net.c > > > +++ b/drivers/net/virtio_net.c > > > @@ -63,6 +63,11 @@ static const unsigned long guest_offloads[] = { > > > VIRTIO_NET_F_GUEST_CSUM > > > }; > > > > > > +#define GUEST_OFFLOAD_LRO_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ > > > + (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ > > > + (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ > > > + (1ULL << VIRTIO_NET_F_GUEST_UFO)) > > > + > > > > I think I'd rather we open-coded this, the macro is only > > used in one place ... > Yes, in this patch, it is used only in one place. But in next patch > [1], we use it twice and that make the code look a bit nicer. > Would we open-coded this in this patch ? > > [1] - http://patchwork.ozlabs.org/project/netdev/patch/20200928033915.82810-2-xiangxia.m.yue@gmail.com/ OK then maybe keep this in a series like you did with v1. > > > struct virtnet_stat_desc { > > > char desc[ETH_GSTRING_LEN]; > > > size_t offset; > > > @@ -2531,7 +2536,8 @@ static int virtnet_set_features(struct net_device *dev, > > > if (features & NETIF_F_LRO) > > > offloads = vi->guest_offloads_capable; > > > else > > > - offloads = 0; > > > + offloads = vi->guest_offloads_capable & > > > + ~GUEST_OFFLOAD_LRO_MASK; > > > > > > err = virtnet_set_guest_offloads(vi, offloads); > > > if (err) > > > > > -- > > > 2.23.0 > > > > > -- > Best regards, Tonghao