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 PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 29 May 2007 17:10:52 -0700 From: "Michael Chan" <mchan@...adcom.com> To: "Herbert Xu" <herbert.xu@...hat.com> cc: "Stephen Hemminger" <shemminger@...ux-foundation.org>, "netdev" <netdev@...r.kernel.org> Subject: Re: Definition and usage of NETIF_F_HW_SUM? On Wed, 2007-05-30 at 07:36 +1000, Herbert Xu wrote: > > I just checked e1000 and it's correct as it does use the csum_offset > when doing TX offload. However, you're definitely right that bnx2 > seems to be broken. > > > A few devices take a offset, starting point, and insertion point. This looks like > > the correct model. But no upper layer protocols other than IPV4/IPV6 can do checksum > > offload at present, so it seems moot. > > I could easily whip up a patch to get GRE to use it for a start :) > > > IMHO the correct solution would be to get rid if NETIF_F_HW_SUM and make a new flag > > NETIF_F_IPV6_SUM. Devices that can checksum both could do NETIF_F_IPV4_SUM|NETI_F_IPV6_SUM. > > We should definitely keep NETIF_F_HW_SUM for sane hardware such as the > e1000. Unfortunately we may just have to invent IPV6_SUM for the broken > ones. > > Ccing Michael to see if the bnx2 chip can actually do offset-based > checksum offload. > bnx2 and tg3 cannot do offset-based checksumming because the hardware doesn't have room in the buffer descriptors to specify the offsets. So regrettably, the NETIF_F_HW_SUM flag has been misused in these drivers. A new NETIF_F_IPV6_SUM flag will be very useful for us. - 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
Powered by blists - more mailing lists