--- Nick Patavalis <npat@inaccessnetworks.com> wrote: > On Tue, Sep 16, 2003 at 06:22:17PM +0300, Nick > Patavalis wrote: > > On Tue, Sep 16, 2003 at 08:09:54AM -0700, Bluesea > wrote: > > > I've a question, does the Linux TCP/IP stack > calculate > > > the pseudo-header checksum if skb->ip_summed = > > > CHECKSUM_HW, or leave it to the driver? > > > > Assuming that you are referring to the transmit > path, and judging from > > the impementation of the e100 driver, it seems > that the kernel has > > performed no checksum calculation if ip_summed == > CHECKSUM_HW. Either > > the hardware or the driver has to do it. In the > case of e100, the > > driver does the pseudo-header checksum calculation > and the hardware > > does the rest. > > > > While this is what happens in the e100 driver, the > kernel *does* seem > to calculate the *pseudo-header checksum* even in > the "skb->ip_summed == CHECKSUM_HW" case. The e100 driver doesn't calculate the pseudo-header checksum. Maybe you are looking at source code of kernel 2.4.20. The function e100_pseudo_hdr_csum() is not used in the later versions. Bluesea __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
