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  1. 28 Mar, 2017 8 commits
    • David S. Miller's avatar
      Merge tag 'mlx5e-failsafe' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux · cc628c96
      David S. Miller authored 
      Saeed Mahameed says:

====================
mlx5e-failsafe 27-03-2017

This series provides a fail-safe mechanism to allow safely re-configuring
mlx5e netdevice and provides a resiliency against sporadic
configuration failures.

To enable this we do some refactoring and code reorganizing to allow
breaking the drivers open/close flows to stages:
      open -> activate -> deactivate -> close.

In addition we need to allow creating fresh HW ring resources
(mlx5e_channels) with their own "new" set of parameters, while keeping
the current ones running and active until the new channels are
successfully created with the new configuration, and only then we can
safly replace (switch) old channels with new ones.

For that we introduce mlx5e_channels object and an API to manage it:
 - channels = open_channels(new_params):
   open fresh TX/RX channels
 - activate_channels(channels):
   redirect traffic to them and attach them to the netdev
 - deactivate_channes(channels)
   stop traffic and detach from netdev
 - close(channels)
   Free the TX/RX HW resources of those channels

With the above strategy it is straightforward to achieve the desired
behavior of fail-safe configuration.  In pseudo code:

make_new_config(new_params)
{
	old_channels = current_active_channels;
	new_channels = create_channels(new_params);
	if (!new_channels)
		return "Failed, but current channels are still active :)"

	deactivate_channels(old_channels); /* Can't fail */
	set_hw_new_state();                /* If needed  */
	activate_channels(new_channels);   /* Can't fail */
	close_channels(old_channels);
	current_active_channels = new_channels;

        return "SUCCESS";
}

At the top of this series, we change the following flows to be fail-safe:
ethtool:
   - ring parameters
   - coalesce parameters
   - tx copy break parameters
   - cqe compressing/moderation mode setting (priv flags)
ndos:
   - tc setup
   - set features: LRO
   - change mtu
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cc628c96
    • David S. Miller's avatar
      Merge branch 'bond-link-status-fixes' · 95ed0edd
      David S. Miller authored 
      Mahesh Bandewar says:

====================
link-status fixes for mii-monitoring

The mii monitoring is divided into two phases - inspect and commit. The
inspect phase technically should not make any changes to the state and
defer it to the commit phase. However detected link state inconsistencies
on several machines and discovered that it's the result of some
inconsistent update to link states and assumption that you *always* get
rtnl-mutex. In reality when trylock() fails to acquire rtnl-mutex, the
commit phase is postponed until next mii-mon run. At the next round
because of the state change performed in the previous inspect-run, this
round does not detect any changes and would skip calling commit phase.
This would result in an inconsistent state until next link event happens
(if it ever happens).

During the the commit phase, it's always assumed that speed and duplex
fetch is always successful, but that's always not the case. However the
slave state is marked UP irrespective of speed / duplex fetch operation.
If the speed / duplex fetch operation results in insane values for either
of these two fields, then keeping internal link state UP is not going to
provide fruitful results either.

Please see into individual patches for more details.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      95ed0edd
    • Mahesh Bandewar's avatar
      bonding: avoid printing while holding a spinlock · e292dcae
      Mahesh Bandewar authored 
      Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e292dcae
    • Mahesh Bandewar's avatar
      bonding: correctly update link status during mii-commit phase · b5bf0f5b
      Mahesh Bandewar authored 
      bond_miimon_commit() marks the link UP after attempting to get the speed
and duplex settings for the link. There is a possibility that
bond_update_speed_duplex() could fail. This is another place where it
could result into an inconsistent bonding link state.

With this patch the link will be marked UP only if the speed and duplex
values retrieved have sane values and processed further.
Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b5bf0f5b
    • Mahesh Bandewar's avatar
      bonding: make speed, duplex setting consistent with link state · c4adfc82
      Mahesh Bandewar authored 
      bond_update_speed_duplex() retrieves speed and duplex settings. There
is a possibility of failure in retrieving these values but caller has
to assume it's always successful. This leads to having inconsistent
slave link settings. If these (speed, duplex) values cannot be
retrieved, then keeping the link UP causes problems.

The updated bond_update_speed_duplex() returns 0 on success if it
retrieves sane values for speed and duplex. On failure it returns 1
and marks the link down.
Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c4adfc82
    • Mahesh Bandewar's avatar
      bonding: improve link-status update in mii-monitoring · de77ecd4
      Mahesh Bandewar authored 
      The primary issue is that mii-inspect phase updates link-state and
expects changes to be committed during the mii-commit phase. After
the inspect phase if it fails to acquire rtnl-mutex, the commit
phase (bond_mii_commit) doesn't get to run. This partially updated
state stays and makes the internal-state inconsistent.

e.g. setup bond0 => slaves: eth1, eth2
eth1 goes DOWN -> UP
   mii_monitor()
	mii-inspect()
	    bond_set_slave_link_state(eth1, UP, DontNotify)
	rtnl_trylock() <- fails!

Next mii-monitor round
eth1: No change
   mii_monitor()
	mii-inspect()
	    eth1->link == current-status (ethtool_ops->get_link)
	    no-change-detected

End result:
    eth1:
      Link = BOND_LINK_UP
      Speed = 0xfffff  [SpeedUnknown]
      Duplex = 0xff    [DuplexUnknown]

This doesn't always happen but for some unlucky machines in a large set
of machines it creates problems.

The fix for this is to avoid making changes during inspect phase and
postpone them until acquiring the rtnl-mutex / invoking commit phase.
Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      de77ecd4
    • Mahesh Bandewar's avatar
      bonding: split bond_set_slave_link_state into two parts · f307668b
      Mahesh Bandewar authored 
      Split the function into two (a) propose (b) commit phase without
changing the semantics for the original API.
Signed-off-by: default avatarMahesh Bandewar <maheshb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f307668b
    • David S. Miller's avatar
      Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue · 205ed44e
      David S. Miller authored 
      Jeff Kirsher says:

====================
40GbE Intel Wired LAN Driver Updates 2017-03-27

This series contains updates to i40e and i40evf only.

Alex updates the driver code so that we can do bulk updates of the page
reference count instead of just incrementing it by one reference at a
time.  Fixed an issue where we were not resetting skb back to NULL when
we have freed it.  Cleaned up the i40e_process_skb_fields() to align with
other Intel drivers.  Removed FCoE code, since it is not supported in any
of the Fortville/Fortpark hardware, so there is not much point of carrying
the code around, especially if it is broken and untested.

Harshitha fixes a bug in the driver where the calculation of the RSS size
was not taking into account the number of traffic classes enabled.

Robert fixes a potential race condition during VF reset by eliminating
IOMMU DMAR Faults caused by VF hardware and when the OS initiates a VF
reset and before the reset is finished we modify the VF's settings.

Bimmy removes a delay that is no longer needed, since it was only needed
for preproduction hardware.

Colin King fixes null pointer dereference, where VSI was being
dereferenced before the VSI NULL check.

Jake fixes an issue with the recent addition of the "client code" to the
driver, where we attempt to use an uninitialized variable, so correctly
initialize the params variable by calling i40e_client_get_params().

v2: dropped patch 5 of the original series from Carolyn since we need
    more documentation and reason why the added delay, so Carolyn is
    taking the time to update the patch before we re-submit it for
    kernel inclusion.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      205ed44e
  3. 27 Mar, 2017 32 commits
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