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Date: Tue, 24 Nov 2015 13:37:54 -0500 (EST) From: David Miller <davem@...emloft.net> To: hannes@...essinduktion.org Cc: tom@...bertland.com, jesse.brandeburg@...el.com, anjali.singhai@...el.com, jesse@...nel.org, netdev@...r.kernel.org, kiran.patil@...el.com Subject: Re: [PATCH v1 1/6] net: Generalize udp based tunnel offload From: Hannes Frederic Sowa <hannes@...essinduktion.org> Date: Tue, 24 Nov 2015 18:43:35 +0100 > On Tue, Nov 24, 2015, at 18:32, Tom Herbert wrote: >> As you said this in only feedback and nobody is forcing anyone to do >> anything. But encouraging HW vendors to provide generic mechanisms so >> that your users can use whatever protocol they want is the exact >> _opposite_ of punishing users, this is very much a pro-user direction. > > Some users will suffer worse performance in case we don't correctly set > ip_summed for a specific protocol before we do the copy operations from > user space into skbs but if they are always done in the driver. Your concern presumes that looking backwards is as important as looking forward. We want to simplify things _and_ move away from protocol specific csums, and if some old crufty hardware based systems pay some performance cost for this I say so be it. So this is not a valid argument against Tom's changes in my mind. -- 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
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