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  1. 17 Feb, 2016 33 commits
  3. 16 Feb, 2016 7 commits
    • Richard Alpe's avatar
      tipc: refactor node xmit and fix memory leaks · 4952cd3e
      Richard Alpe authored 
      Refactor tipc_node_xmit() to fail fast and fail early. Fix several
potential memory leaks in unexpected error paths.
Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
Reviewed-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Signed-off-by: default avatarRichard Alpe <richard.alpe@ericsson.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      4952cd3e
    • Amitoj Kaur Chawla's avatar
      dmascc: Return correct error codes · 37ace20a
      Amitoj Kaur Chawla authored 
      This change has been made with the goal that kernel functions should
return something more descriptive than -1 on failure.

A variable `err` has been introduced for storing error codes.

The return value of kzalloc on failure should return a -1 and not a
-ENOMEM. This was found using Coccinelle. A simplified version of
the semantic patch used is:

//<smpl>
@@
expression *e;
identifier l1;
@@

e = kzalloc(...);
if (e == NULL) {
...
goto l1;
}
l1:
...
return -1
+ -ENOMEM
;
//</smpl

Furthermore, set `err` to -ENOMEM on failure of alloc_netdev(), and to
-ENODEV on failure of register_netdev() and probe_irq_off().

The single call site only checks that the return value is not 0,
hence no change is required at the call site.
Signed-off-by: default avatarAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      37ace20a
    • David S. Miller's avatar
      Merge branch '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue · 31d035a0
      David S. Miller authored 
      Jeff Kirsher says:

====================
1GbE Intel Wired LAN Driver Updates 2016-02-15

This series contains updates to igb only.

Shota Suzuki cleans up unnecessary flag setting for 82576 in
igb_set_flag_queue_pairs() since the default block already sets
IGB_FLAG_QUEUE_PAIRS to the correct value anyways, so the e1000_82576
code block is not necessary and we can simply fall through.  Then fixes
an issue where IGB_FLAG_QUEUE_PAIRS can now be set by using "ethtool -L"
option but is never cleared unless the driver is reloaded, so clear the
queue pairing if the pairing becomes unnecessary as a result of "ethtool
-L".

Mitch fixes the igbvf from giving up if it fails to get the hardware
mailbox lock.  This can happen when the PF-VF communication channel is
heavily loaded and causes complete communications failure between the
PF and VF drivers, so add a counter and a delay so that the driver will
now retry ten times before giving up on getting the mailbox lock.

The remaining patches in the series are from Alex Duyck, starting with the
cleaning up code that sets the MAC address.  Then refactors the VFTA and
VLVF configuration, to simplify and update to similar setups in the ixgbe
driver.  Fixed an issue were VLANs headers size was being added to the
value programmed into the RLPML registers, yet these registers already
take into account the size of the VLAN headers when determining the
maximum packet length, so we can drop the code that adds the size to
the RLPML registers.  Cleaned up the configuration of the VF port based
VLAN configuration.  Also fixed the igb driver so that we can fully
support SR-IOV or the recently added NTUPLE filtering while allowing
support for VLAN promiscuous mode.  Also added the ability to use the
bridge utility to add a FDB entry for the PF to an igb port.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      31d035a0
    • David S. Miller's avatar
      Merge branch 'ethtool-channels-rxfh-conflict' · 9a14b1c2
      David S. Miller authored 
      Jacob Keller says:

====================
ethtool: correct {GS}CHANNELS and {GS}RXFH conflict

This patch series fixes up ethtool_set_channels operation which
allowed modifying the RXFH table indirectly by reducing the number of
queues below the current max queue used by the Rx flow table. Most
drivers incorrectly allowed this to destroy the Rx flow table and
would then start by reinitializing it to default settings. However,
drivers are not able to correctly handle the conflict since there was
no way to differentiate between the default settings and the user
requested explicit settings.

To fix this, implement a new netdev private flag which we use to
indicate whether the RXFH has been user configured. If someone has
a better alternative of how to store this information, let me know.
I am not sure that priv_flags is the best solution but I have not had
any better idea.

Secondly, we add a function which just calls the driver's get_rxfh
callback to determine the current indirection table. Loop through this
and we can determine the current highest queue that will be used by
RSS.

Now, modify ethtool_set_channels to add a check ensuring that if (a)
we have had rxfh configured by user, (b) we can get the maximum RSS
queue currently used, then we ensure that the newly requested Rx count
(or combined count) is at least as high as this maximum RSS queue. The
reasoning here is that we can always safely increase the number of
queues. If we decrease the queues we must ensure that the decrease
does not go lower than the highest in-use queue for the Rx flow table.

Drivers may still need to be patched if they currently overwrite the
Rx flow table during channel configuration. If the driver currently
always resets Rx flow table when increasing number of queues it must
be patched to only do this when netif_is_rxfh_configured returns
false.

The second patch simply adds a check to ensure that all provided
channel counts fit within driver defined maximums.

The third patch fixes fm10k to correctly reconfigure the RSS reta
table whenever it is still unconfigured. This means that the default
state will provide RSS to every queue. Once the user has configured
RXFH, then we should maintain it. In addition, since the case where we
must reconfigure the RSS table in this case should now no longer
occur, add a dev_err message to indicate the user that we did so.

I have also supplied an ethtool patch to enable setting the default Rx
flow indirection table. Without this, current ethtool does not support
sending an indir_size of 0, and thus does not correctly support
configuring back to the default.

Changes in v2:
* fixed compile error
* fixed incorrect comparison with max_rx_in_use
* adjusted looping over dev_size
* removed inline on function
* dropped patch about separating combined vs asymmetric channels
* verified behavior using fm10k driver
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9a14b1c2
    • Keller, Jacob E's avatar
      fm10k: don't reinitialize RSS flow table when RXFH configured · 1012014e
      Keller, Jacob E authored 
      Also print an error message incase we do have to reconfigure as this
should no longer happen anymore due to ethtool changes. If it somehow
does occur, user should be made aware of it.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1012014e
    • Keller, Jacob E's avatar
      ethtool: ensure channel counts are within bounds during SCHANNELS · 8bf36862
      Keller, Jacob E authored 
      Add a sanity check to ensure that all requested channel sizes are within
bounds, which should reduce errors in driver implementation.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8bf36862
    • Keller, Jacob E's avatar
      ethtool: correctly ensure {GS}CHANNELS doesn't conflict with GS{RXFH} · d4ab4286
      Keller, Jacob E authored 
      Ethernet drivers implementing both {GS}RXFH and {GS}CHANNELS ethtool ops
incorrectly allow SCHANNELS when it would conflict with the settings
from SRXFH. This occurs because it is not possible for drivers to
understand whether their Rx flow indirection table has been configured
or is in the default state. In addition, drivers currently behave in
various ways when increasing the number of Rx channels.

Some drivers will always destroy the Rx flow indirection table when this
occurs, whether it has been set by the user or not. Other drivers will
attempt to preserve the table even if the user has never modified it
from the default driver settings. Neither of these situation is
desirable because it leads to unexpected behavior or loss of user
configuration.

The correct behavior is to simply return -EINVAL when SCHANNELS would
conflict with the current Rx flow table settings. However, it should
only do so if the current settings were modified by the user. If we
required that the new settings never conflict with the current (default)
Rx flow settings, we would force users to first reduce their Rx flow
settings and then reduce the number of Rx channels.

This patch proposes a solution implemented in net/core/ethtool.c which
ensures that all drivers behave correctly. It checks whether the RXFH
table has been configured to non-default settings, and stores this
information in a private netdev flag. When the number of channels is
requested to change, it first ensures that the current Rx flow table is
not going to assign flows to now disabled channels.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d4ab4286
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