Date: Mon, 30 Mar 2015 22:06:28 -0700 From: hiren panchasara <hiren@strugglingcoder.info> To: Adrian Chadd <adrian@freebsd.org> 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: <20150331050628.GJ10892@strugglingcoder.info> In-Reply-To: <CAJ-Vmom1tE6g=ta-DPLDF%2Bnp0GOpFYOXn=PkspaALfazz-n4Gg@mail.gmail.com> References: <20150323233908.GT53237@strugglingcoder.info> <20150323234214.GU53237@strugglingcoder.info> <CAFOYbc=f3OT85z50uqYEnBUkEej=8FRnRP8TpQuTStgqUEoDTA@mail.gmail.com> <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>
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--5me2qT3T17SWzdxI Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 03/30/15 at 04:33P, Adrian Chadd wrote: > So, the 32 bit field that has the flowid in the rx descriptor can mean > multiple things - not just the flowid. >=20 > For igb it can also mean one of the RX checksums. I care about igb(4) right now and I350 specifically. I checked the spec and section 7.1.2.8 Receive-Side Scaling (RSS) which defines it. In igb_initialise_rss_mapping(), we do set MRQC register which means we are getting RSS hash in flowid. And we disable packet checksum to get RSS type via PCSD register.=20 Is my understanding not correct? I am missing how can we not get RSS hash in flowid in this case. Can you please explain? Cheers, Hiren --5me2qT3T17SWzdxI Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQF8BAEBCgBmBQJVGitUXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRBNEUyMEZBMUQ4Nzg4RjNGMTdFNjZGMDI4 QjkyNTBFMTU2M0VERkU1AAoJEIuSUOFWPt/lKbQH/iikNL7O3IXlboxmV4b7DVBM 4MuzKx7uEz7fFwq4ybDc5PbSZ3+iFE68A1C7sS5rI0Lf8Ph1xdkDsPYFKFiR1t3v wpT+oNl0fJfFZgGafvxmWcN08XVgOMPJLVWi6ci07/JYv6KTxug4hyTZNs7khYGA nAGd0TjzqVBvO6suXWvufIojpRuxx7R44mtytUjpBdmATdz7Dv/qDOsrrcuAbUal qbNMd0IHPn9gXWDzNne0aNepQKbcCjJ0YTImVnGpZaGtBqNFbwjM41ZjJbM/bT+3 IlCM6//r5E/v3xtIkbymtiQRd7DvApL69qTNfihkinPj7fPDT2nxI8zsyuprwB8= =f/Qc -----END PGP SIGNATURE----- --5me2qT3T17SWzdxI--
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