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Message-ID: <20141106211522.GA55313@gmail.com> Date: Thu, 6 Nov 2014 13:15:22 -0800 From: Joe Stringer <joestringer@...ira.com> To: alexander.duyck@...il.com, netdev@...r.kernel.org, Dept-GELinuxNICDev@...gic.com, linux-kernel@...r.kernel.org Cc: Alexander Duyck <alexander.duyck@...il.com>, sathya.perla@...lex.com, jeffrey.t.kirsher@...el.com, linux.nics@...el.com, amirv@...lanox.com, shahed.shaikh@...gic.com, therbert@...gle.com Subject: Re: [PATCH net 3/5] fm10k: Implement ndo_gso_check() On Thu, Nov 06, 2014 at 10:41:15AM -0800, Joe Stringer wrote: > On Wed, Nov 05, 2014 at 06:54:00PM -0800, Alexander Duyck wrote: > > On 11/04/2014 01:56 PM, Joe Stringer wrote: > > > ndo_gso_check() was recently introduced to allow NICs to report the > > > offloading support that they have on a per-skb basis. Add an > > > implementation for this driver which checks for something that looks > > > like VXLAN. > > > > > > Implementation shamelessly stolen from Tom Herbert: > > > http://thread.gmane.org/gmane.linux.network/332428/focus=333111 > > > > > > Signed-off-by: Joe Stringer <joestringer@...ira.com> > > > --- > > > Should this driver report support for GSO on packets with tunnel headers > > > up to 64B like the i40e driver does? > > > --- > > > drivers/net/ethernet/intel/fm10k/fm10k_netdev.c | 12 ++++++++++++ > > > 1 file changed, 12 insertions(+) > > > > > > diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c > > > index 8811364..b9ef622 100644 > > > --- a/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c > > > +++ b/drivers/net/ethernet/intel/fm10k/fm10k_netdev.c > > > @@ -1350,6 +1350,17 @@ static void fm10k_dfwd_del_station(struct net_device *dev, void *priv) > > > } > > > } > > > > > > +static bool fm10k_gso_check(struct sk_buff *skb, struct net_device *dev) > > > +{ > > > + if ((skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) && > > > + (skb->inner_protocol_type != ENCAP_TYPE_ETHER || > > > + skb->inner_protocol != htons(ETH_P_TEB) || > > > + skb_inner_mac_header(skb) - skb_transport_header(skb) != 16)) > > > + return false; > > > + > > > + return true; > > > +} > > > + > > > static const struct net_device_ops fm10k_netdev_ops = { > > > .ndo_open = fm10k_open, > > > .ndo_stop = fm10k_close, > > > @@ -1372,6 +1383,7 @@ static const struct net_device_ops fm10k_netdev_ops = { > > > .ndo_do_ioctl = fm10k_ioctl, > > > .ndo_dfwd_add_station = fm10k_dfwd_add_station, > > > .ndo_dfwd_del_station = fm10k_dfwd_del_station, > > > + .ndo_gso_check = fm10k_gso_check, > > > }; > > > > > > #define DEFAULT_DEBUG_LEVEL_SHIFT 3 > > > > I'm thinking this check is far too simplistic. If you look the fm10k > > driver already has fm10k_tx_encap_offload() in the TSO function for > > verifying if it can support offloading tunnels or not. I would > > recommend starting there or possibly even just adapting that function to > > suit your purpose. > > > > Thanks, > > > > Alex > > Would it be enough to just call fm10k_tx_encap_offload() in a way that echoes fm10k_tso()? > > +static bool fm10k_gso_check(struct sk_buff *skb, struct net_device *dev) > +{ > + if (skb->encapsulation && !fm10k_tx_encap_offload(skb)) > + return false; > + > + return true; > +} Oh, I suppose we need to check the gso_type too. More like this? +static bool fm10k_gso_check(struct sk_buff *skb, struct net_device *dev) +{ + if ((skb_shinfo(skb)->gso_type & (SKB_GSO_UDP_TUNNEL | SKB_GSO_GRE)) && + !fm10k_tx_encap_offload(skb)) + return false; + + return true; +} -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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