netdev - Re: [PATCH 1/2] net: add IFF_SKB_TX_SHARED flag to priv

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Date:	Tue, 26 Jul 2011 10:54:21 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, Robert Olsson <robert.olsson@....uu.se>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/2] net: add IFF_SKB_TX_SHARED flag to priv_flags

On Mon, Jul 25, 2011 at 10:11:22PM +0200, Eric Dumazet wrote:
> Le lundi 25 juillet 2011 à 15:45 -0400, Neil Horman a écrit :
> > Pktgen attempts to transmit shared skbs to net devices, which can't be used by
> > some drivers as they keep state information in skbs.  This patch adds a flag
> > marking drivers as being able to handle shared skbs in their tx path.  Drivers
> > are defaulted to being unable to do so, but calling ether_setup enables this
> > flag, as 90% of the drivers calling ether_setup touch real hardware and can
> > handle shared skbs.  A subsequent patch will audit drivers to ensure that the
> > flag is set properly
> > 
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> > Reported-by: Jiri Pirko <jpirko@...hat.com>
> > CC: Robert Olsson <robert.olsson@....uu.se>
> > CC: Eric Dumazet <eric.dumazet@...il.com>
> > CC: Alexey Dobriyan <adobriyan@...il.com>
> > CC: David S. Miller <davem@...emloft.net>
> > ---
> >  include/linux/if.h |    2 ++
> >  net/core/pktgen.c  |    8 +++++---
> >  net/ethernet/eth.c |    1 +
> >  3 files changed, 8 insertions(+), 3 deletions(-)
> > 
> > diff --git a/include/linux/if.h b/include/linux/if.h
> > index 3bc63e6..03489ca 100644
> > --- a/include/linux/if.h
> > +++ b/include/linux/if.h
> > @@ -76,6 +76,8 @@
> >  #define IFF_BRIDGE_PORT	0x4000		/* device used as bridge port */
> >  #define IFF_OVS_DATAPATH	0x8000	/* device used as Open vSwitch
> >  					 * datapath port */
> > +#define IFF_TX_SKB_SHARING	0x10000	/* The interface supports sharing
> > +					 * skbs on transmit */
> >  
> >  #define IF_GET_IFACE	0x0001		/* for querying only */
> >  #define IF_GET_PROTO	0x0002
> > diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> > index f76079c..53f3f15 100644
> > --- a/net/core/pktgen.c
> > +++ b/net/core/pktgen.c
> > @@ -1070,7 +1070,9 @@ static ssize_t pktgen_if_write(struct file *file,
> >  		len = num_arg(&user_buffer[i], 10, &value);
> >  		if (len < 0)
> >  			return len;
> > -
> > +		if ((len > 0) &&
> 
> 		if ((value > 0) ...
> 
Thank you Eric, I'll respin this shortly
Neil
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