Skip to content
GitLab
  1. Feb 09, 2022
  3. Feb 04, 2022
  5. Feb 03, 2022
    • Waiman Long's avatar
      cgroup/cpuset: Fix "suspicious RCU usage" lockdep warning · 2bdfd282
      Waiman Long authored 
      It was found that a "suspicious RCU usage" lockdep warning was issued
with the rcu_read_lock() call in update_sibling_cpumasks().  It is
because the update_cpumasks_hier() function may sleep. So we have
to release the RCU lock, call update_cpumasks_hier() and reacquire
it afterward.

Also add a percpu_rwsem_assert_held() in update_sibling_cpumasks()
instead of stating that in the comment.

Fixes: 4716909c

 ("cpuset: Track cpusets that use parent's effective_cpus")
Signed-off-by: default avatarWaiman Long <longman@redhat.com>
Tested-by: default avatarPhil Auld <pauld@redhat.com>
Reviewed-by: default avatarPhil Auld <pauld@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      2bdfd282
    • Nathan Chancellor's avatar
      tools/resolve_btfids: Do not print any commands when building silently · 7f3bdbc3
      Nathan Chancellor authored 
      When building with 'make -s', there is some output from resolve_btfids:

$ make -sj"$(nproc)" oldconfig prepare
  MKDIR     .../tools/bpf/resolve_btfids/libbpf/
  MKDIR     .../tools/bpf/resolve_btfids//libsubcmd
  LINK     resolve_btfids

Silent mode means that no information should be emitted about what is
currently being done. Use the $(silent) variable from Makefile.include
to avoid defining the msg macro so that there is no information printed.

Fixes: fbbb68de

 ("bpf: Add resolve_btfids tool to resolve BTF IDs in ELF object")
Signed-off-by: default avatarNathan Chancellor <nathan@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220201212503.731732-1-nathan@kernel.org
      7f3bdbc3
    • John Hubbard's avatar
      Revert "mm/gup: small refactoring: simplify try_grab_page()" · c36c04c2
      John Hubbard authored 
      This reverts commit 54d516b1

That commit did a refactoring that effectively combined fast and slow
gup paths (again).  And that was again incorrect, for two reasons:

 a) Fast gup and slow gup get reference counts on pages in different
    ways and with different goals: see Linus' writeup in commit
    cd1adf1b ("Revert "mm/gup: remove try_get_page(), call
    try_get_compound_head() directly""), and

 b) try_grab_compound_head() also has a specific check for
    "FOLL_LONGTERM && !is_pinned(page)", that assumes that the caller
    can fall back to slow gup. This resulted in new failures, as
    recently report by Will McVicker [1].

But (a) has problems too, even though they may not have been reported
yet.  So just revert this.

Link: https://lore.kernel.org/r/20220131203504.3458775-1-willmcvicker@google.com [1]
Fixes: 54d516b1

 ("mm/gup: small refactoring: simplify try_grab_page()")
Reported-and-tested-by: default avatarWill McVicker <willmcvicker@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Minchan Kim <minchan@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: stable@vger.kernel.org # 5.15
Signed-off-by: default avatarJohn Hubbard <jhubbard@nvidia.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c36c04c2
    • Linus Torvalds's avatar
      Merge tag 'mips-fixes-5.17_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux · d394bb77
      Linus Torvalds authored 
      Pull MIPS fixes from Thomas Bogendoerfer:

 - fix missed change for PTR->PTR_WD conversion

 - kernel-doc fixes

* tag 'mips-fixes-5.17_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: KVM: fix vz.c kernel-doc notation
  MIPS: octeon: Fix missed PTR->PTR_WD conversion
      d394bb77
    • David S. Miller's avatar
      Merge branch 'dsa-mv88e6xxx-phylink_generic_validate' · 9c309189
      David S. Miller authored 
      

Russell King says:

====================
net: dsa: mv88e6xxx: convert to phylink_generic_validate()

The overall objective of this series is to convert the mv88e6xxx DSA
driver to use phylink_generic_validate().

Patch 1 adds a new helper mv88e6352_g2_scratch_port_has_serdes() which
indicates whether an 88e6352 port has a serdes associated with it. This
is necessary as ports 4 and 5 will normally be in automedia mode, where
the CMODE field in the port status register will change e.g. between 15
(internal PHY) and 9 (1000base-X) depending on whether the serdes has
link.

The existing code caches the cmode field, and depending whether the
serdes has link at probe time, determines whether we allow things such
as the serdes statistics to be accessed. This means if the link isn't
up at probe time, the serdes is essentially unavailable.

Patch 1 addresses this by reading the pin configuration to find out
whether the serdes is attached to port 4 or port 5.

Patch 2 is a joint effort between myself and Marek Behún, adding the
supported interfaces and MAC capabilities to all mv88e6xxx supported
switch devices. This is slightly more restrictive than the original
code as we didn't used to care too much about the interface mode, but
with this we do - which is why we must know if there's a serdes
associated now.

Patch 3 switches mv88e6xxx to use the generic validation by removing
the initialisation of the phylink_validate pointer in the dsa_ops
struct.

Patch 4 updates the statistics code to use the new helper in patch 1,
so the serdes statistics are available even if the link was down at
driver probe time.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9c309189
    • Russell King (Oracle)'s avatar
      net: dsa: mv88e6xxx: improve 88e6352 serdes statistics detection · 7f7d32bc
      Russell King (Oracle) authored 
      

The decision whether to report serdes statistics currently depends on
the cached C_Mode value for the port, read at probe time or updated by
configuration. However, port 4 can be in "automedia" mode when it is
used as a serdes port, meaning it switches between the internal PHY and
the serdes, changing the read-only C_Mode value depending on which
first gains link. Consequently, the C_Mode value read at probe does not
accurately reflect whether the port has the serdes associated with it.

In "net: dsa: mv88e6xxx: add mv88e6352_g2_scratch_port_has_serdes()",
we added a way to read the hardware configuration to determine which
port has the serdes associated with it. Use this to determine which
port reports the serdes statistics.

Reviewed-by: default avatarMarek Behún <kabel@kernel.org>
Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7f7d32bc
    • Russell King (Oracle)'s avatar
      net: dsa: mv88e6xxx: convert to phylink_generic_validate() · 2ee84cfe
      Russell King (Oracle) authored 
      

Now that the mv88e6xxx chip drivers are supplying the supported
interfaces and MAC capabilities, switch the driver to use the generic
phylink validation implementation by removing our own validation
implementations. This causes DSA to call phylink_generic_validate()
on our behalf.

Reviewed-by: default avatarMarek Behún <kabel@kernel.org>
Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2ee84cfe
    • Russell King (Oracle)'s avatar
      net: dsa: mv88e6xxx: populate supported_interfaces and mac_capabilities · d4ebf12b
      Russell King (Oracle) authored 
      

Populate the supported interfaces and MAC capabilities for the
Marvell MV88E6xxx DSA switches in preparation to using these for the
validation functionality.

Patch co-authored by Marek.

Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Marek Behún <kabel@kernel.org> [ fixed 6341 and 6393x ]
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d4ebf12b
    • Russell King (Oracle)'s avatar
      net: dsa: mv88e6xxx: add mv88e6352_g2_scratch_port_has_serdes() · 62001548
      Russell King (Oracle) authored 
      

Read the hardware configuration to determine which port is attached
to the serdes.

Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      62001548
    • David S. Miller's avatar
      Merge branch 'dsa-mv88e6xxx-port-isolation' · 09476443
      David S. Miller authored 
      

Tobias Waldekranz says:

====================
net: dsa: mv88e6xxx: Improve standalone port isolation

The ideal isolation between standalone ports satisfies two properties:
1. Packets from one standalone port must not be forwarded to any other
   port.
2. Packets from a standalone port must be sent to the CPU port.

mv88e6xxx solves (1) by isolating standalone ports using the PVT. Up
to this point though, (2) has not guaranteed; as the ATU is still
consulted, there is a chance that incoming packets never reach the CPU
if its DA has previously been used as the SA of an earlier packet (see
1/5 for more details). This is typically not a problem, except for one
very useful setup in which switch ports are looped in order to run the
bridge kselftests in tools/testing/selftests/net/forwarding. This
series attempts to solve (2).

Ideally, we could simply use the "ForceMap" bit of more modern chips
(Agate and newer) to classify all incoming packets as MGMT. This is
not available on older silicon that is still widely used (Opal Plus
chips like the 6097 for example).

Instead, this series takes a two pronged approach:

1/5: Always clear MapDA on standalone ports to make sure that no ATU
     entry can lead packets astray. This solves (2) for single-chip
     systems.

2/5: Trivial prep work for 4/5.
3/5: Trivial prep work for 4/5.

4/5: On multi-chip systems though, this is not enough. On the incoming
     chip, the packet will be forced out towards the CPU thanks to
     1/5, but on any intermediate chips the ATU is still consulted. We
     override this behavior by marking the reserved standalone VID (0)
     as a policy VID, the DSA ports' VID policy is set to TRAP. This
     will cause the packet to be reclassified as MGMT on the first
     intermediate chip, after which it's a straight shot towards the
     CPU.

Finally, we allow more tests to be run on mv88e6xxx:

5/5: The bridge_vlan{,un}aware suites sets an ageing_time of 10s on
     the bridge it creates, but mv88e6xxx has a minimum supported time
     of 15s. Allow this time to be overridden in forwarding.config.

With this series in place, mv88e6xxx passes the following kselftest
suites:

- bridge_port_isolation.sh
- bridge_sticky_fdb.sh
- bridge_vlan_aware.sh
- bridge_vlan_unaware.sh

v1 -> v2:
  - Wording/spelling (Vladimir)
  - Use standard iterator in dsa_switch_upstream_port (Vladimir)
  - Limit enabling of VTU port policy to downstream DSA ports (Vladimir)
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      09476443
    • Tobias Waldekranz's avatar
      selftests: net: bridge: Parameterize ageing timeout · 08119759
      Tobias Waldekranz authored 
      

Allow the ageing timeout that is set on bridges to be customized from
forwarding.config. This allows the tests to be run on hardware which
does not support a 10s timeout (e.g. mv88e6xxx).

Signed-off-by: default avatarTobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: default avatarPetr Machata <petrm@nvidia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      08119759