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Marc Kleine-Budde dc7dabab8c Merge patch series "can: length: fix definitions and add bit length calculation" 
Vincent Mailhol <mailhol.vincent@wanadoo.fr> says:

When created in [1], frames length definitions were added to implement
byte queue limits (bql). Because bql expects lengths in bytes, bit
length definitions were not considered back then.

Recently, a need to refer to the exact frame length in bits, with CAN
bit stuffing, appeared in [2].

This series introduces can_frame_bits(): a function-like macro that
can calculate the exact size of a CAN(-FD) frame in bits with or
without bitsuffing.

[1] commit 85d99c3e2a ("can: length: can_skb_get_frame_len(): introduce
    function to get data length of frame in data link layer")
Link: https://git.kernel.org/torvalds/c/85d99c3e2a13

[2] RE: [PATCH] can: mcp251xfd: Increase poll timeout
Link: https://lore.kernel.org/linux-can/BL3PR11MB64846C83ACD04E9330B0FE66FB729@BL3PR11MB6484.namprd11.prod.outlook.com

* Changelog *

v4 -> v5:

  * In __can_cc_frame_bits() and __can_fd_frame_bits(), enclose
    data_len in brackets to prevent operator precedence issues.

  * Add a note in can_frame_bits() documentation to explain that
    data_len shall have no side effects.

  * While at it, make CAN(FD)_FRAME_LEN_MAX definition fit on a single
    line.

  * A few typo/grammar small fixes in the commit descriptions.

Link: https://lore.kernel.org/linux-can/20230601165625.100040-1-mailhol.vincent@wanadoo.fr

v3 -> v4:

  * No functional changes.

  * as reported by Simon Horman, fix typo in the documentation of
    can_bitstuffing_len(): "bitstream_len" -> "destuffed_len".

  * as reported by Thomas Kopp, fix several other typos:
      - "indicatior" -> "indicator"
      - "in on the wire" -> "on the wire"
      - "bitsuffing" -> "bitstuffing".

  * in CAN_FRAME_LEN_MAX comment: specify that only the dynamic
    bitstuffing gets ignored but that the intermission is included.

  * move the Suggested-by: Thomas Kopp tag from patch 2 to patch 3.

  * add Reviewed-by: Thomas Kopp tag on the full series.

  * add an additional line of comment for the @intermission argument
    of can_frame_bits().

Link: https://lore.kernel.org/linux-can/20230530144637.4746-1-mailhol.vincent@wanadoo.fr

v2 -> v3:

  * turn can_frame_bits() and can_frame_bytes() into function-like
    macros. The fact that inline functions can not be used to
    initialize constant struct fields was bothering me. I did my best
    to make the macro look as less ugly as possible.

  * as reported by Simon Horman, add missing document for the is_fd
    argument of can_frame_bits().

Link: https://lore.kernel.org/linux-can/20230523065218.51227-1-mailhol.vincent@wanadoo.fr

v1 -> v2:

  * as suggested by Thomas Kopp, add a new patch to the series to fix
    the stuff bit count and the fixed stuff bits definitions

  * and another patch to fix documentation of the Remote Request
    Substitution (RRS).

  * refactor the length definition. Instead of using individual macro,
    rely on an inline function. One reason is to minimize the number
    of definitions. Another reason is that because the dynamic bit
    stuff is calculated differently for CAN and CAN-FD, it is just not
    possible to multiply the existing CANFD_FRAME_OVERHEAD_SFF/EFF by
    the overhead ratio to get the bitsuffing: for CAN-FD, the CRC
    field is already stuffed by the fixed stuff bits and is out of
    scope of the dynamic bitstuffing.

Link: https://lore.kernel.org/linux-can/20230507155506.3179711-1-mailhol.vincent@wanadoo.fr

Link: https://lore.kernel.org/all/20230611025728.450837-1-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2023-06-22 09:44:22 +02:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-05-18 14:39:34 -07:00
block for-6.4/block-2023-05-06 2023-05-06 08:28:58 -07:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto This push fixes the following problems: 2023-05-07 10:57:14 -07:00
Documentation Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 2023-05-18 20:04:59 -07:00
drivers can: length: refactor frame lengths definition to add size in bits 2023-06-22 09:43:40 +02:00
fs nfsd-6.4 fixes: 2023-05-17 09:56:01 -07:00
include can: length: refactor frame lengths definition to add size in bits 2023-06-22 09:43:40 +02:00
init Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
io_uring for-6.4/io_uring-2023-05-07 2023-05-07 10:00:09 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-05-18 14:39:34 -07:00
lib Networking fixes for 6.4-rc2, including fixes from netfilter 2023-05-11 08:42:47 -05:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm Reinstate the dmapool changes which were accidentally removed by 2023-05-06 11:43:08 -07:00
net net/tcp: refactor tcp_inet6_sk() 2023-05-22 11:22:58 +01:00
rust Rust changes for v6.4 2023-04-30 11:20:22 -07:00
samples bpf-next-for-netdev 2023-05-16 19:50:05 -07:00
scripts bpf-next-for-netdev 2023-05-16 19:50:05 -07:00
security integrity-v6.4 2023-04-29 10:11:32 -07:00
sound sound fixes for 6.4-rc1 2023-05-06 08:07:11 -07:00
tools selftests: mptcp: centralize stats dumping 2023-05-18 20:06:32 -07:00
usr initramfs: Check negative timestamp to prevent broken cpio archive 2023-04-16 17:37:01 +09:00
virt s390: 2023-05-01 12:06:20 -07:00
.clang-format cxl for v6.4 2023-04-30 11:51:51 -07:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore linux-kselftest-kunit-6.4-rc1 2023-04-24 12:31:32 -07:00
.mailmap mailmap: add entries for Nikolay Aleksandrov 2023-05-17 09:35:05 +01:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING
CREDITS MAINTAINERS: sctp: move Neil to CREDITS 2023-05-12 08:51:32 +01:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 2023-05-18 20:04:59 -07:00
Makefile Linux 6.4-rc2 2023-05-14 12:51:40 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.