netdev - Re: [RFC] be2net: add rxhash support

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Date:	Fri, 25 Feb 2011 20:32:45 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ajit Khaparde <ajit.khaparde@...lex.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] be2net: add rxhash support

Le vendredi 25 février 2011 à 19:21 +0100, Eric Dumazet a écrit :
> Le vendredi 25 février 2011 à 11:44 -0600, Ajit Khaparde a écrit :
> > -----
> > [PATCH net-next] be2net: add rxhash support
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > Signed-off-by: Ajit Khaparde <ajit.khaparde@...lex.com>
> > ---
> >  drivers/net/benet/be_main.c |   11 +++++++++++
> >  1 files changed, 11 insertions(+), 0 deletions(-)
> > 
> > diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
> > index 26f9c56..8c4b782 100644
> > --- a/drivers/net/benet/be_main.c
> > +++ b/drivers/net/benet/be_main.c
> > @@ -1038,6 +1038,10 @@ static void be_rx_compl_process(struct be_adapter *adapter,
> >  
> >  	skb->truesize = skb->len + sizeof(struct sk_buff);
> >  	skb->protocol = eth_type_trans(skb, adapter->netdev);
> > +	if (adapter->netdev->features & NETIF_F_RXHASH)
> > +		skb->rxhash = AMAP_GET_BITS(struct amap_eth_rx_compl,
> > +					rsshash, rxcp);
> > +
> >  
> >  	vlanf = AMAP_GET_BITS(struct amap_eth_rx_compl, vtp, rxcp);
> >  	vtm = AMAP_GET_BITS(struct amap_eth_rx_compl, vtm, rxcp);
> > @@ -1099,6 +1103,10 @@ static void be_rx_compl_process_gro(struct be_adapter *adapter,
> >  		return;
> >  	}
> >  
> > +	if (adapter->netdev->features & NETIF_F_RXHASH)
> > +		skb->rxhash = AMAP_GET_BITS(struct amap_eth_rx_compl,
> > +						rsshash, rxcp);
> > +
> >  	remaining = pkt_size;
> >  	for (i = 0, j = -1; i < num_rcvd; i++) {
> >  		page_info = get_rx_page_info(adapter, rxo, rxq_idx);
> > @@ -2619,6 +2627,9 @@ static void be_netdev_init(struct net_device *netdev)
> >  		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> >  		NETIF_F_GRO | NETIF_F_TSO6;
> >  
> > +	if (be_multi_rxq(adapter))
> > +		netdev->features |= NETIF_F_RXHASH;
> > +
> >  	netdev->vlan_features |= NETIF_F_SG | NETIF_F_TSO |
> >  		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
> >  
> 
> 
> I added some traces, and I am not sure its OK :
> 
> With one active tcp flow, I got different rxhash values :
> 
> [ 1064.674253] rxhash=bbd37952 rsshp=1 bank=1
> [ 1064.738104] rxhash=37acd31d rsshp=1 bank=1
> [ 1064.741684] rxhash=bbd37952 rsshp=1 bank=1
> [ 1064.874283] rxhash=bbd37952 rsshp=1 bank=1
> [ 1064.940201] rxhash=bbd37952 rsshp=1 bank=1
> [ 1064.955278] rxhash=b668ace2 rsshp=1 bank=1
> [ 1065.080028] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.153360] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.293164] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.401862] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.460506] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.519980] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.650160] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.717585] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.730909] rxhash=37acd31d rsshp=1 bank=1
> [ 1065.840350] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.900704] rxhash=bbd37952 rsshp=1 bank=1
> [ 1065.931526] rxhash=b668ace2 rsshp=1 bank=1
> [ 1066.503657] rxhash=bbd37952 rsshp=1 bank=1
> [ 1066.570138] rxhash=bbd37952 rsshp=1 bank=1
> 
> How is it possible ?
> 
> (I have a VLAN config on top of a bonding)
> 
> 

Also, Ajit, we need something to allow ethtool -K rxhash {on|off}

Something like (completely untested)

diff --git a/drivers/net/benet/be_ethtool.c b/drivers/net/benet/be_ethtool.c
index 6e5e433..540c1ea 100644
--- a/drivers/net/benet/be_ethtool.c
+++ b/drivers/net/benet/be_ethtool.c
@@ -712,6 +712,11 @@ be_read_eeprom(struct net_device *netdev, struct ethtool_eeprom *eeprom,
 	return status;
 }
 
+static int be_set_flags(struct net_device *dev, u32 data)
+{
+	return ethtool_op_set_flags(dev, data, ETH_FLAG_RXHASH);
+}
+
 const struct ethtool_ops be_ethtool_ops = {
 	.get_settings = be_get_settings,
 	.get_drvinfo = be_get_drvinfo,
@@ -739,4 +744,5 @@ const struct ethtool_ops be_ethtool_ops = {
 	.get_ethtool_stats = be_get_ethtool_stats,
 	.flash_device = be_do_flash,
 	.self_test = be_self_test,
+	.set_flags = be_set_flags,
 };


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