It was found that when a process was rapidly sending MADs other processes could
be hung in their unregister calls.

This would happen when process A was injecting packets fast enough that the
single threaded workqueue was never exiting ib_mad_completion_handler.
Therefore when process B called flush_workqueue via the unregister call it
would hang until process A stopped sending MADs.

The fix is to periodically reschedule ib_mad_completion_handler after
processing a large number of completions.  The number of completions chosen was
decided based on the defaults for the recv queue size.  However, it was kept
fixed such that increasing those queue sizes would not adversely affect
fairness in the future.
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NDean Luick <dean.luick@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Add support of cross-channel functionality to mlx5
driver. This includes ability to ignore overrun for CQ
which intended for cross-channel, export device capability and
configure the QP to be sync master/slave queues.

The cross-channel enabled QP supports combination of
three possible properties:
* WQE processing on the receive queue of this QP
* WQE processing on the send queue of this QP
* WQE are supported on the send queue
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The cross-channel feature allows to execute WQEs that involve
synchronization of I/O operations’ on different QPs.

This capability enables to program complex flows with a single
function call, hereby significantly reducing overhead associated
with I/O processing.

Cross-channel operations support is indicated by HCA capability
information.

The queue pairs can be configured to work as a “sync master queue”
or “sync slave queues”.

The added flags are:

1. Device capability flag IB_DEVICE_CROSS_CHANNEL for the
   devices that can perform cross-channel operations.

2. CQ property flag IB_CQ_FLAGS_IGNORE_OVERRUN to disable CQ overrun
   check. This check is useless in cross-channel scenario.

3. QP property flags to indicate if queues are slave or master:
   * IB_QP_CREATE_MANAGED_SEND indicates that posted send work requests
     will not be executed immediately and requires enabling.
   * IB_QP_CREATE_MANAGED_RECV indicates that posted receive work
     requests will not be executed immediately and requires enabling.
   * IB_QP_CREATE_CROSS_CHANNEL declares the QP to work in cross-channel
     mode. If IB_QP_CREATE_MANAGED_SEND and IB_QP_CREATE_MANAGED_RECV are
     not provided, this QP will be sync master queue, else it will be sync
     slave.
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Modify enum ib_device_cap_flags such that other patches which add new
enum values pass strict checkpatch.pl checks.
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

In order to read the HCA's current cycles register, we need
to map it to user-space. Add support to map this register
via mmap command.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NMoshe Lazer <moshel@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Pass hca_core_clock_offset to user-space is mandatory in order to
let the user-space read the free-running clock register from the
right offset in the memory mapped page.
Passing this value is done by changing the vendor's command
and response of init_ucontext to be in extensible form.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NMoshe Lazer <moshel@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Reporting the hca_core_clock (in kHZ) and the timestamp_mask in
query_device extended verb. timestamp_mask is used by users in order
to know what is the valid range of the raw timestamps, while
hca_core_clock reports the clock frequency that is used for
timestamps.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NMoshe Lazer <moshel@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Extending core and vendor verb commands require us to check that the
unknown part of the user's given command is all zeros.
Adding ib_is_udata_cleared in order to do so.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NHaggai Eran <haggaie@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

In order to create a CQ that supports timestamp, mlx5 needs to
support the extended create CQ command with the timestamp flag.
Signed-off-by: NMatan Barak <matanb@mellanox.com>
Reviewed-by: NEli Cohen <eli@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Check if the extended counters are available and if so
create the proper extended and additional counters.
Signed-off-by: NChristoph Lameter <cl@linux.com>
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Reviewed-by: NHal Rosenstock <hal@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Add the attr_id on port_table_attribute since we will have to add
a different port_table_attribute for the extended attribute soon.
Reviewed-by: NHal Rosenstock <hal@mellanox.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Create a new function to retrieve performance management
data from the existing code in get_pma_counter().
Reviewed-by: NHal Rosenstock <hal@mellanox.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

The driver was written originally by Roland Dreier, currently there's
no official maintainer. Yishai steps in as maintainer.
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Cc: Roland Dreier <roland@kernel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Matan and Leon step in as co-maintainers to replace Eli Cohen
who wrote and maintained the core and IB drivers.
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NBart Van Assche <bvanassche@sandisk.com>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

And simplify the calling convention for full-memory registrations.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Just pass and address/size pair instead of an ib_phys_buf array.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Fold simplified versions of build_phys_page_list and
iwch_register_phys_mem into iwch_get_dma_wr now that no other callers
are left.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Remove the unused ib_allow_mw and ib_bind_mw functions, remove the
unused IB_WR_BIND_MW and IB_WC_BIND_MW opcodes and move ib_dealloc_mw
into the uverbs module.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

We have stopped using phys MRs in the kernel a while ago, so let's
remove all the cruft used to implement them.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-By: Devesh Sharma<devesh.sharma@avagotech.com> [ocrdma]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

This functionality has no users and was only supported by the staged out
EHCA driver.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Just IB_DEVICE_LOCAL_DMA_LKEY and IB_DEVICE_MEM_MGT_EXTENSIONS for now
as I'm most familar with those.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NSagi Grimberg <sagig@mellanox.com>
Reviewed-By: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Code cleanup to move multicast specific code that checks for
a sendonly join to ipoib_multicast.c. This allows the removal
of the export of __ipoib_mcast_find().
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Code cleanup to remove multicast specific code from ipoib_main.c

The removal of a list of multicast groups occurs in three places.
Create a new function ipoib_mcast_remove_list(). Use this new
function in ipoib_main.c too.
That in turn allows the dropping of two functions that were
exported from ipoib_multicast.c for expiration of mc groups.
Reviewed-by: NIra Weiny <ira.weiny@intel.com>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Advertise RoCE support for IB/core layer and set the hardware to
work in RoCE mode.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Set the address handle and QP address path fields according to the
link layer type (IB/Eth).
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

These callbacks write into the mlx5 RoCE address table.
Upon del_gid we write a zero'd GID.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

When handling a responder completion, if the link layer is Ethernet,
set the work completion network_hdr_type field according to CQE's
info and the IB_WC_WITH_NETWORK_HDR_TYPE flag.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Using the vport access functions to retrieve the Ethernet
specific information and return this information in
ib_query_device and ib_query_port.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Introduce access functions to query NIC vport system_image_guid,
node_guid and qkey_viol_cntr.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

A mlx5 Ethernet port must be explicitly enabled for RoCE.
When RoCE is not enabled on the port, the NIC will refuse to create
QPs attached to it and incoming RoCE packets will be considered by the
NIC as plain Ethernet packets.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Introduce a new function called mlx5_query_nic_vport_context().
This function gets all the NIC vport attributes from the device.

The MAC address is just one of the NIC vport attributes, so
mlx5_query_nic_vport_mac_address() is now just a wrapper function
above mlx5_query_nic_vport_context().

More NIC vport attributes will be used in following commits.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

For Eth ports only:
Maintain a net device pointer in mlx5_ib_device and update it
upon NETDEV_REGISTER and NETDEV_UNREGISTER events if the
net-device and IB device have the same PCI parent device.
Implement the get_netdev callback to return this net device.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Make the existing mlx5_ib_port_link_layer() signature match
the ib device callback signature (add port_num parameter).
Refactor it to use a sub function so that the link layer could
be queried also before the ibdev is created.
Signed-off-by: NAchiad Shochat <achiad@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

kzalloc doesn't return ERR_PTR, so there is no need to test for it.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,e;
@@

* x = kzalloc(...)
... when != x = e
* IS_ERR_OR_NULL(x)
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: NDave Goodell <dgoodell@cisco.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NDave Goodell <dgoodell@cisco.com>
Reviewed-by: NReese Faucette <rfaucett@cisco.com>
Reviewed-by: NXuyang Wang <xuywang@cisco.com>
Signed-off-by: NNelson Escobar <neescoba@cisco.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

Signed-off-by: NDave Goodell <dgoodell@cisco.com>
Reviewed-by: NReese Faucette <rfaucett@cisco.com>
Reviewed-by: NXuyang Wang <xuywang@cisco.com>
Signed-off-by: NNelson Escobar <neescoba@cisco.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

They were already implemented at a lower layer, but the upper level
routine placed arbitrary restrictions on which transitions were
permitted.  Simplify the state machine logic to live wholly in
usnic_ib_qp_grp_modify.
Signed-off-by: NDave Goodell <dgoodell@cisco.com>
Reviewed-by: NReese Faucette <rfaucett@cisco.com>
Reviewed-by: NXuyang Wang <xuywang@cisco.com>
Signed-off-by: NNelson Escobar <neescoba@cisco.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>