netdev - Re: Hight speed data sending from custom IP out of kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 25 Apr 2011 14:30:25 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	monstr@...str.eu
Cc:	juice@...gman.org, netdev@...r.kernel.org
Subject: Re: Hight speed data sending from custom IP out of kernel

Le lundi 25 avril 2011 à 14:27 +0200, Eric Dumazet a écrit :
> Le lundi 25 avril 2011 à 14:18 +0200, Michal Simek a écrit :
> 
> > > 
> > > Now, if all you want to do is send many packets from pktgen (with only
> > > ID changing), you could add a fast path to not rebuild from scratch new
> > > packets.
> > 
> > What do you mean?
> 
> 
> If you know your device has X slots in its TX ring buffer, you would
> have to maintain at least X+1 skbs in pktgen to make sure you reuse an
> skb while its previous logical content was sent on wire.
> 
> Then you are free to only change iph->id and iph->check very fast.
> 

Checking skb->users would also be a good way to know if TX completion
released skb reference. If your module owns the last reference, it can
do a recycle.




--
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