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From: daniel@iogearbox.net (Daniel Borkmann)
To: linux-arm-kernel@lists.infradead.org
Subject: arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit
Date: Wed, 29 Mar 2017 02:00:08 +0200	[thread overview]
Message-ID: <58DAF908.8010404@iogearbox.net> (raw)
In-Reply-To: <CAHgaXd+4QkFxnt-_iCqH8AyCN_Y8gXwr+y=iugz38NKSWspsbA@mail.gmail.com>

Hi Shubham,

On 03/28/2017 10:49 PM, Shubham Bansal wrote:
[...]
> Do you have any document to understand the working of tail calls? I
> looked at your presentations but it seemed confusing to me. Anything
> simple would be great, just about the tail calls. I don't think I need
> examples, I can get them from your presentations. I just need a very
> general idea. May be you know the code in kernel where it is
> implemented.

Sure, it's in __bpf_prog_run(), see the JMP_TAIL_CALL (kernel/bpf/core.c +1019).
That's effectively what JITs implement. [1] page 3 has a high-level description
as well, hope that helps.

Thanks,
Daniel

   [1] http://www.netdevconf.org/1.1/proceedings/papers/On-getting-tc-classifier-fully-programmable-with-cls-bpf.pdf

  reply	other threads:[~2017-03-29  0:00 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-30 10:38 arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit Shubham Bansal
2017-01-30 21:57 ` Kees Cook
     [not found]   ` <CAHgaXd+nj69n-Xf46N=4M-j-0hKHVrrLfsvRZCG=2CCAtVF6ZA@mail.gmail.com>
     [not found]     ` <CAGXu5j+NSLomuSgD40kys+pWc+J9aB6Bbk_gSP9Lp_ScimQn_w@mail.gmail.com>
2017-02-01 13:01       ` Shubham Bansal
     [not found]         ` <76621BFF-B30B-4417-AB2B-DB21CA6092D9@netronome.com>
2017-02-03  7:04           ` Shubham Bansal
2017-02-03  8:25             ` nick viljoen
2017-02-08  7:29         ` Shubham Bansal
2017-02-08 19:41         ` Kees Cook
2017-03-15 12:13           ` Shubham Bansal
2017-03-15 21:55             ` David Miller
2017-03-28 20:49               ` Shubham Bansal
2017-03-29  0:00                 ` Daniel Borkmann [this message]
2017-03-30 14:04                   ` Shubham Bansal
2017-04-06 11:05                     ` Shubham Bansal
2017-04-06 12:51                       ` Daniel Borkmann
2017-05-06 16:48                         ` Shubham Bansal
2017-05-06 18:38                           ` David Miller
2017-05-06 20:27                             ` Shubham Bansal
2017-05-06 22:17                               ` Shubham Bansal
2017-05-09 20:12                         ` Shubham Bansal
2017-05-09 20:19                           ` David Miller
2017-05-09 20:25                           ` Daniel Borkmann
     [not found] <CAHgaXdKsO2xoKYp7g91g+n+d_1KHSSByLjzBB-WjVXSjhB7qxw@mail.gmail.com>
     [not found] ` <20170510.212952.1440495072777358778.davem@davemloft.net>
     [not found]   ` <CAHgaXdK8LEEUPm4jTRRzCnjwdWAauHmmB=caZsSFY8MmStH89Q@mail.gmail.com>
     [not found]     ` <20170510.215218.2185526627014393313.davem@davemloft.net>
     [not found]       ` <CAHgaXdKZ_v+iO7uqEDx7PA7D+xcp1FngGvJ1SRSsGXNQ-iWWDQ@mail.gmail.com>
2017-05-11  9:32         ` Shubham Bansal
2017-05-11 15:30           ` Kees Cook
2017-05-13 21:38             ` Shubham Bansal
2017-05-15 17:44               ` Kees Cook
2017-05-15 19:55               ` Daniel Borkmann
2017-05-20 20:01                 ` Shubham Bansal
2017-05-22 13:01                   ` Daniel Borkmann
2017-05-22 17:04                     ` Shubham Bansal
2017-05-22 20:05                       ` Kees Cook
2017-05-23  2:58                         ` Shubham Bansal
2017-05-23  4:27                           ` Kees Cook
2017-05-22 18:58                   ` Kees Cook
2017-05-22 19:08                     ` Florian Fainelli
2017-05-23  3:34                       ` Shubham Bansal
2017-05-23  4:22                         ` Kees Cook
2017-05-23  5:03                           ` Shubham Bansal
2017-05-23  5:35                             ` Kees Cook
     [not found]                               ` <CAHgaXdJa9uJYO3bODuzDRaqOas0i=zMk0jioWFXKm_=UJRtVrw@mail.gmail.com>
2017-05-23 19:32                                 ` Kees Cook

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