Date: Fri, 3 Apr 2015 12:15:54 -0700 From: Adrian Chadd <adrian@freebsd.org> To: hiren panchasara <hiren@strugglingcoder.info> Cc: Jack F Vogel <jfv@freebsd.org>, FreeBSD Net <freebsd-net@freebsd.org>, erj@freebsd.org, Jack Vogel <jfvogel@gmail.com>, Jason Wolfe <nitroboost@gmail.com> Subject: Re: Full 32bit flowid from igb(4) Message-ID: <CAJ-Vmom5tetcq%2BJHFdYH6kWi8qx2GNEV7WAKfAb5%2B6D3YKr7OQ@mail.gmail.com> In-Reply-To: <20150403170239.GD72165@strugglingcoder.info> References: <20150324154931.GC53237@strugglingcoder.info> <CAJ-Vmo=ajfWokQ3bdu1Ww8kV3AdVwwsDpoS9y_%2Bywk%2BgcrbBvQ@mail.gmail.com> <20150330225945.GI10892@strugglingcoder.info> <CAJ-Vmom1tE6g=ta-DPLDF%2Bnp0GOpFYOXn=PkspaALfazz-n4Gg@mail.gmail.com> <20150331050628.GJ10892@strugglingcoder.info> <CAJ-VmokL1PnA=Nv0wKTWtY2f1RLCzW3GShOPQ0t=gd6B93kC4A@mail.gmail.com> <20150331170933.GK10892@strugglingcoder.info> <CAJ-Vmok19d4K0ucvsxc8kUmpv0e2L7CHkYjgNC56sg_wigC1cQ@mail.gmail.com> <20150403165411.GC72165@strugglingcoder.info> <CAJ-VmokzcHKHYanmwFgB_4d8CJKajs6G7gY11_J4nWGf3JAUkQ@mail.gmail.com> <20150403170239.GD72165@strugglingcoder.info>
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On 3 April 2015 at 10:02, hiren panchasara <hiren@strugglingcoder.info> wrote: > On 04/03/15 at 10:00P, Adrian Chadd wrote: >> On 3 April 2015 at 09:54, hiren panchasara <hiren@strugglingcoder.info> wrote: >> > On 03/31/15 at 11:15P, Adrian Chadd wrote: >> >> Yeah, I think the right thing to do is: >> >> >> >> * If the descriptor says it's RSS, then use the flowid + rss type >> > So, if we have multiqueue, we do everything needed to get RSS >> > flowid/type. That means, with num_queues > 1 we can just expose those. >> > >> >> * else, set it to queue id and set the type to opaque. >> > >> > This part becomes irrelevant as it's a single queue case. Do we care >> > about setting flowid value/type in case of single queue? >> >> My whole point with not always setting it is that people may do things >> to /other/ parts of the driver and suddenly the RSS field isn't the >> RSS field anymore. >> >> Doubly so if you start playing with multiqueue + flowdirector on ixgbe. :) >> >> So I'd rather the driver be right and correct - checking if the field >> /is/ RSS and only setting the flowid+flowtype /if/ the value in that >> register is an RSS flowid, rather than setting it to whatever's there >> and hoping it's an RSS value. :) > > Okay, I guess it doesn't hurt to read those registers again at the time > of actually assigning flowid/type. I'll do that and post a review on > phabricator. Well, the "Is this RSS flowid" bits are in the RX descriptor, so you don't have to worry about reading registers. :) -adrian
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