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Vladimir Oltean 9d5ef190e5 net: dsa: automatically bring up DSA master when opening user port DSA wants the master interface to be open before the user port is due to historical reasons. The promiscuity of interfaces that are down used to have issues, as referenced Lennert Buytenhek in commit `df02c6ff2e` ("dsa: fix master interface allmulti/promisc handling"). The bugfix mentioned there, commit `b6c40d68ff` ("net: only invoke dev->change_rx_flags when device is UP"), was basically a "don't do that" approach to working around the promiscuity while down issue. Further work done by Vlad Yasevich in commit `d2615bf450` ("net: core: Always propagate flag changes to interfaces") has resolved the underlying issue, and it is strictly up to the DSA and 8021q drivers now, it is no longer mandated by the networking core that the master interface must be up when changing its promiscuity. From DSA's point of view, deciding to error out in dsa_slave_open because the master isn't up is (a) a bad user experience and (b) knocking at an open door. Even if there still was an issue with promiscuity while down, DSA could still just open the master and avoid it. Doing it this way has the additional benefit that user space can now remove DSA-specific workarounds, like systemd-networkd with BindCarrier: https://github.com/systemd/systemd/issues/7478 And we can finally remove one of the 2 bullets in the "Common pitfalls using DSA setups" chapter. Tested with two cascaded DSA switches: $ ip link set sw0p2 up fsl_enetc 0000:00:00.2 eno2: configuring for fixed/internal link mode fsl_enetc 0000:00:00.2 eno2: Link is Up - 1Gbps/Full - flow control rx/tx mscc_felix 0000:00:00.5 swp0: configuring for fixed/sgmii link mode mscc_felix 0000:00:00.5 swp0: Link is Up - 1Gbps/Full - flow control off 8021q: adding VLAN 0 to HW filter on device swp0 sja1105 spi2.0 sw0p2: configuring for phy/rgmii-id link mode IPv6: ADDRCONF(NETDEV_CHANGE): eno2: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): swp0: link becomes ready Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2021-02-06 14:42:57 -08:00
arch	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-02-02 14:21:31 -08:00
block	block-5.11-2021-01-29	2021-01-29 13:50:06 -08:00
certs	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
crypto	X.509: Fix crash caused by NULL pointer	2021-01-20 11:33:51 -08:00
Documentation	net: dsa: automatically bring up DSA master when opening user port	2021-02-06 14:42:57 -08:00
drivers	net: hns3: replace macro of max qset number with specification	2021-02-06 14:36:05 -08:00
fs	Networking fixes for 5.11-rc7, including fixes from bpf and mac80211	2021-02-02 10:26:09 -08:00
include	net: Introduce {netdev,napi}_alloc_frag_align()	2021-02-06 11:57:28 -08:00
init	Revert "init/console: Use ttynull as a fallback when there is no console"	2021-01-08 11:02:18 -08:00
ipc	Merge branch 'akpm' (patches from Andrew)	2020-12-15 12:53:37 -08:00
kernel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-02-02 14:21:31 -08:00
lib	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-01-28 17:09:31 -08:00
LICENSES	LICENSES: Add the CC-BY-4.0 license	2020-12-08 10:33:27 -07:00
mm	mm: page_frag: Introduce page_frag_alloc_align()	2021-02-06 11:57:28 -08:00
net	net: dsa: automatically bring up DSA master when opening user port	2021-02-06 14:42:57 -08:00
samples	bpf: Rename BPF_XADD and prepare to encode other atomics in .imm	2021-01-14 18:34:29 -08:00
scripts	Kbuild fixes for v5.11	2021-01-10 13:24:55 -08:00
security	dump_common_audit_data(): fix racy accesses to ->d_name	2021-01-16 15:11:35 -05:00
sound	ALSA: hda/via: Apply the workaround generically for Clevo machines	2021-01-26 18:05:03 +01:00
tools	selftests: mptcp: add command line arguments for mptcp_join.sh	2021-02-06 14:35:47 -08:00
usr	Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-08-07 13:29:39 -07:00
virt	KVM/arm64 fixes for 5.11, take #2	2021-01-25 18:52:01 -05:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-01-29 15:00:23 +01:00
.cocciconfig
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: docs: ignore sphinx_*/ directories	2020-09-10 10:44:31 -06:00
.mailmap	mailmap: remove the "repo-abbrev" comment	2021-01-26 11:40:17 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: dccp: move Gerrit Renker to CREDITS	2021-01-14 10:53:49 -08:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	net: dsa: add a second tagger for Ocelot switches based on tag_8021q	2021-01-29 21:25:27 -08:00
Makefile	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2021-02-02 14:21:31 -08:00
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.