GitHub/MotorolaMobilityLLC/kernel-slsi.git
7 years agoIB/mlx5: Expose MR cache for mlx5_ib
Artemy Kovalyov [Wed, 18 Jan 2017 14:58:10 +0000 (16:58 +0200)]
IB/mlx5: Expose MR cache for mlx5_ib

Allow other parts of mlx5_ib to use MR cache mechanism.
* Add new functions mlx5_mr_cache_alloc and mlx5_mr_cache_free
* Traditional MTT MKey buckets are limited by MAX_UMR_CACHE_ENTRY
  Additinal buckets may be added above.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Add null_mkey access
Artemy Kovalyov [Wed, 18 Jan 2017 14:58:09 +0000 (16:58 +0200)]
IB/mlx5: Add null_mkey access

Add mlx5_cmd_null_mkey() function to access null_mkey information
from firmware.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/umem: Indicate that process is being terminated
Artemy Kovalyov [Wed, 18 Jan 2017 14:58:08 +0000 (16:58 +0200)]
IB/umem: Indicate that process is being terminated

When process is killed while pagefault operation still in progress -
function will fail. In this specific case we don't want any warnings in
dmesg to avoid log analyzers false alerts. So we need distinct error
code for this case.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/umem: Update on demand page (ODP) support
Artemy Kovalyov [Wed, 18 Jan 2017 14:58:07 +0000 (16:58 +0200)]
IB/umem: Update on demand page (ODP) support

Currently ODP MR may explicitly register virtual address space area
of limited length.
This change allows MR to cover entire process virtual address space
dynamicaly adding/removing translation entries to device MTT.

Add following changes to support implicit MR:
* Allow umem to be zero size to back-up implicit MR.
* Add new function ib_alloc_odp_umem() to add virtual memory regions
  to implicit MR dynamically on demand.
* Add new function rbt_ib_umem_lookup() to find dynamically added
  virtual memory regions.
* Expose function rbt_ib_umem_for_each_in_range() to other modules and
  make it safe

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Add implicit MR flag
Artemy Kovalyov [Wed, 18 Jan 2017 14:58:06 +0000 (16:58 +0200)]
IB/core: Add implicit MR flag

Add flag IB_ODP_SUPPORT_IMPLICIT indicating implicit MR supported.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Support creation of a WQ with scatter FCS offload
Noa Osherovich [Wed, 18 Jan 2017 13:40:04 +0000 (15:40 +0200)]
IB/mlx5: Support creation of a WQ with scatter FCS offload

Add support for creation of a WQ with scatter FCS capability, if
this capability is supported by the hardware.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Enable QP creation with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:40:03 +0000 (15:40 +0200)]
IB/mlx5: Enable QP creation with cvlan offload

Enable creating a RAW Ethernet QP with cvlan stripping offload when
it's supported by the hardware.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Enable WQ creation and modification with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:40:02 +0000 (15:40 +0200)]
IB/mlx5: Enable WQ creation and modification with cvlan offload

Allow creating a WQ with cvlan stripping considering device's
capabilities. The default value was fixed to disable vlan stripping
till was asked explicitly.

In addition, allow modification of a WQ to turn on/off this property.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Expose vlan offloads capabilities
Noa Osherovich [Wed, 18 Jan 2017 13:40:01 +0000 (15:40 +0200)]
IB/mlx5: Expose vlan offloads capabilities

Check device's capabilities and report which raw packet capabilities
are supported.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/uverbs: Enable QP creation with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:40:00 +0000 (15:40 +0200)]
IB/uverbs: Enable QP creation with cvlan offload

Enable user applications to create a QP with cvlan stripping offload.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/uverbs: Enable WQ creation and modification with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:39:59 +0000 (15:39 +0200)]
IB/uverbs: Enable WQ creation and modification with cvlan offload

Enable user space application via WQ creation and modification to
turn on and off cvlan offload.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/uverbs: Expose vlan offloads capabilities
Noa Osherovich [Wed, 18 Jan 2017 13:39:58 +0000 (15:39 +0200)]
IB/uverbs: Expose vlan offloads capabilities

Expose raw packet capabilities to user space as part of query device.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Add scatter FCS flag to use in WQ creation
Noa Osherovich [Wed, 18 Jan 2017 13:39:57 +0000 (15:39 +0200)]
IB/core: Add scatter FCS flag to use in WQ creation

Add a new creation flag to set the scatter FCS capability of a WQ.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Enable QP creation with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:39:56 +0000 (15:39 +0200)]
IB/core: Enable QP creation with cvlan offload

Add a QP creation flag to support cvlan stripping, it's applicable
for RAW Ethernet QP.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Enable WQ creation and modification with cvlan offload
Noa Osherovich [Wed, 18 Jan 2017 13:39:55 +0000 (15:39 +0200)]
IB/core: Enable WQ creation and modification with cvlan offload

Enable WQ creation and modification with cvlan stripping offload.
This includes:
- Adding WQ creation flags.
- Extending modify WQ to get flags and flags mask to enable turning
  it on and off.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Expose vlan offloads capabilities
Noa Osherovich [Wed, 18 Jan 2017 13:39:54 +0000 (15:39 +0200)]
IB/core: Expose vlan offloads capabilities

Expose raw packet capabilities in the core layer to enable a device
to report it.
Two existing capabilities, scatter FCS and IP CSUM were added to this
field for a better user experience by exposing the raw packet caps
from one location.
This field will serve also for future capabilities for raw packet QP.

A new capability was introduced - cvlan stripping, which is the
device's ability to remove cvlan tag from an incoming packet and
report it in the matching work completion.

Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Add port counter support for Receive WQs
Majd Dibbiny [Wed, 18 Jan 2017 13:25:10 +0000 (15:25 +0200)]
IB/mlx5: Add port counter support for Receive WQs

Counters weren't updated due to Receive WQs' traffic since the
counter-id was not associated with the RQ.

Added support for associating the q-counter-id with the Receive WQ.
The attachment is done only when changing WQ's state from RESET to
READY in modify-WQ command.

FW support is required for the above, without this support
Receive WQ counters will not count.

Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Expose Q counters groups only if they are supported by FW
Kamal Heib [Wed, 18 Jan 2017 13:25:09 +0000 (15:25 +0200)]
IB/mlx5: Expose Q counters groups only if they are supported by FW

This patch modify the Q counters implementation, so each one of the
three Q counters groups will be exposed by the driver only if they are
supported by the firmware.

Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Replace ENOTSUPP usage with EOPNOTSUPP
Leon Romanovsky [Wed, 18 Jan 2017 12:59:51 +0000 (14:59 +0200)]
IB/mlx5: Replace ENOTSUPP usage with EOPNOTSUPP

Flow steering is supposed to return EOPNOTSUPP error
for unsupported fields and not ENOTSUPP error.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Add flow tag support
Moses Reuben [Wed, 18 Jan 2017 12:59:50 +0000 (14:59 +0200)]
IB/mlx5: Add flow tag support

Set flow tag in flow table entry, when IB_FLOW_SPEC_ACTION_TAG
is part of the flow specifications.

Flow tag doesn't support multicast flows, so it's passing to
hardware only when used.

Signed-off-by: Moses Reuben <mosesr@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/uverbs: Add support for flow tag
Moses Reuben [Wed, 18 Jan 2017 12:59:49 +0000 (14:59 +0200)]
IB/uverbs: Add support for flow tag

The struct ib_uverbs_flow_spec_action_tag associates a tag_id with the
flow defined by any number of other flow_spec entries which can reference
L2, L3, and L4 packet contents.

Use of ib_uverbs_flow_spec_action_tag allows the consumer to identify
the set of rules which where matched by
the packet by examining the tag_id in the CQE.

Signed-off-by: Moses Reuben <mosesr@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/core: Introduce flow tag specification
Moses Reuben [Wed, 18 Jan 2017 12:59:48 +0000 (14:59 +0200)]
IB/core: Introduce flow tag specification

This specification identifies flow with a specific tag-id.
This tag-id will be reported in the CQE.

Signed-off-by: Moses Reuben <mosesr@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agonet/mlx5: Consolidate flow rules regardless their flow tag
Maor Gottlieb [Wed, 18 Jan 2017 12:59:47 +0000 (14:59 +0200)]
net/mlx5: Consolidate flow rules regardless their flow tag

Flow rules with same match criteria and value should be mapped to
the same flow table entry regardless the flow tag identifier.

Flow tag is part of flow table entry context and not of the
destination, therefore we should return error when we try to add
destination to flow table entry with different flow tag.

Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Remove deprecated module parameter
Leon Romanovsky [Wed, 18 Jan 2017 12:10:36 +0000 (14:10 +0200)]
IB/mlx5: Remove deprecated module parameter

Commit 9603b61de1ee ("mlx5: Move pci device handling from mlx5_ib
to mlx5_core") moved prof_sel module parameter from mlx5_ib to mlx5_core
and marked it as deprecated in 2014.

Three years after deprecation, it is time to remove the deprecated
module parameter.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Jack Morgenstein <jackm@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Assign DSCP for R-RoCE QPs Address Path
Majd Dibbiny [Wed, 18 Jan 2017 12:10:35 +0000 (14:10 +0200)]
IB/mlx5: Assign DSCP for R-RoCE QPs Address Path

For Routable RoCE QPs, the DSCP should be set in the QP's
address path.

The DSCP's value is derived from the traffic class.

Fixes: 2811ba51b049 ("IB/mlx5: Add RoCE fields to Address Vector")
Cc: Achiad Shochat <achiad@mellanox.com>
Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Reviewed-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Avoid SMP MADs from VFs
Maor Gottlieb [Wed, 18 Jan 2017 12:10:34 +0000 (14:10 +0200)]
IB/mlx5: Avoid SMP MADs from VFs

According to the device specification, we need to check that the
has_smi bit is set in vport context before allowing send SMP
MADs from VF.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Add additional checks before processing MADs
Maor Gottlieb [Wed, 18 Jan 2017 12:10:33 +0000 (14:10 +0200)]
IB/mlx5: Add additional checks before processing MADs

Check the has_smi bit in vport context and class version of MADs
before allowing MADs processing to take place.
MAD_IFC SMI commands can be executed only if smi bit is set.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Parvi Kaustubhi <parvik@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Verify that Q counters are supported
Kamal Heib [Wed, 18 Jan 2017 12:10:32 +0000 (14:10 +0200)]
IB/mlx5: Verify that Q counters are supported

Make sure that the Q counters are supported by the FW before trying
to allocate/deallocte them, this will avoid driver load failure when
they aren't supported by the FW.

Fixes: 0837e86a7a34 ('IB/mlx5: Add per port counters')
Cc: <stable@vger.kernel.org> # v4.7+
Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Return error for unsupported signature type
Leon Romanovsky [Wed, 18 Jan 2017 12:10:31 +0000 (14:10 +0200)]
IB/mlx5: Return error for unsupported signature type

In case of unsupported singature, we returned positive
value, while the better approach is to return -EINVAL.

In addition, in this change, the error print is enriched
to provide an actual supplied signature type.

Fixes: e6631814fb3a ("IB/mlx5: Support IB_WR_REG_SIG_MR")
Cc: Sagi Grimberg <sagi@grimberg.me>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoIB/mlx5: Fix out-of-bound access
Leon Romanovsky [Wed, 18 Jan 2017 12:10:30 +0000 (14:10 +0200)]
IB/mlx5: Fix out-of-bound access

When we initialize buffer to create SRQ in kernel,
the number of pages was less than actually used in
following mlx5_fill_page_array().

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Cc: <stable@vger.kernel.org> # v3.10+
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
7 years agoMerge tag 'mlx5-4kuar-for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git...
David S. Miller [Mon, 9 Jan 2017 22:09:31 +0000 (17:09 -0500)]
Merge tag 'mlx5-4kuar-for-4.11' of git://git./linux/kernel/git/mellanox/linux

Saeed Mahameed says:

====================
mlx5 4K UAR

The following series of patches optimizes the usage of the UAR area which is
contained within the BAR 0-1. Previous versions of the firmware and the driver
assumed each system page contains a single UAR. This patch set will query the
firmware for a new capability that if published, means that the firmware can
support UARs of fixed 4K regardless of system page size. In the case of
powerpc, where page size equals 64KB, this means we can utilize 16 UARs per
system page. Since user space processes by default consume eight UARs per
context this means that with this change a process will need a single system
page to fulfill that requirement and in fact make use of more UARs which is
better in terms of performance.

In addition to optimizing user-space processes, we introduce an allocator
that can be used by kernel consumers to allocate blue flame registers
(which are areas within a UAR that are used to write doorbells). This provides
further optimization on using the UAR area since the Ethernet driver makes
use of a single blue flame register per system page and now it will use two
blue flame registers per 4K.

The series also makes changes to naming conventions and now the terms used in
the driver code match the terms used in the PRM (programmers reference manual).
Thus, what used to be called UUAR (micro UAR) is now called BFREG (blue flame
register).

In order to support compatibility between different versions of
library/driver/firmware, the library has now means to notify the kernel driver
that it supports the new scheme and the kernel can notify the library if it
supports this extension. So mixed versions of libraries can run concurrently
without any issues.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agotcp: make TCP_INFO more consistent
Eric Dumazet [Mon, 9 Jan 2017 18:29:27 +0000 (10:29 -0800)]
tcp: make TCP_INFO more consistent

tcp_get_info() has to lock the socket, so lets lock it
for an extended critical section, so that various fields
have consistent values.

This solves an annoying issue that some applications
reported when multiple counters are updated during one
particular rx/rx event, and TCP_INFO was called from
another cpu.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'bpf-verifier-improvements'
David S. Miller [Mon, 9 Jan 2017 21:56:28 +0000 (16:56 -0500)]
Merge branch 'bpf-verifier-improvements'

Alexei Starovoitov says:

====================
bpf: verifier improvements

A number of bpf verifier improvements from Gianluca.
See individual patches for details.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agobpf: rename ARG_PTR_TO_STACK
Alexei Starovoitov [Mon, 9 Jan 2017 18:19:50 +0000 (10:19 -0800)]
bpf: rename ARG_PTR_TO_STACK

since ARG_PTR_TO_STACK is no longer just pointer to stack
rename it to ARG_PTR_TO_MEM and adjust comment.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agobpf: allow helpers access to variable memory
Gianluca Borello [Mon, 9 Jan 2017 18:19:49 +0000 (10:19 -0800)]
bpf: allow helpers access to variable memory

Currently, helpers that read and write from/to the stack can do so using
a pair of arguments of type ARG_PTR_TO_STACK and ARG_CONST_STACK_SIZE.
ARG_CONST_STACK_SIZE accepts a constant register of type CONST_IMM, so
that the verifier can safely check the memory access. However, requiring
the argument to be a constant can be limiting in some circumstances.

Since the current logic keeps track of the minimum and maximum value of
a register throughout the simulated execution, ARG_CONST_STACK_SIZE can
be changed to also accept an UNKNOWN_VALUE register in case its
boundaries have been set and the range doesn't cause invalid memory
accesses.

One common situation when this is useful:

int len;
char buf[BUFSIZE]; /* BUFSIZE is 128 */

if (some_condition)
len = 42;
else
len = 84;

some_helper(..., buf, len & (BUFSIZE - 1));

The compiler can often decide to assign the constant values 42 or 48
into a variable on the stack, instead of keeping it in a register. When
the variable is then read back from stack into the register in order to
be passed to the helper, the verifier will not be able to recognize the
register as constant (the verifier is not currently tracking all
constant writes into memory), and the program won't be valid.

However, by allowing the helper to accept an UNKNOWN_VALUE register,
this program will work because the bitwise AND operation will set the
range of possible values for the UNKNOWN_VALUE register to [0, BUFSIZE),
so the verifier can guarantee the helper call will be safe (assuming the
argument is of type ARG_CONST_STACK_SIZE_OR_ZERO, otherwise one more
check against 0 would be needed). Custom ranges can be set not only with
ALU operations, but also by explicitly comparing the UNKNOWN_VALUE
register with constants.

Another very common example happens when intercepting system call
arguments and accessing user-provided data of variable size using
bpf_probe_read(). One can load at runtime the user-provided length in an
UNKNOWN_VALUE register, and then read that exact amount of data up to a
compile-time determined limit in order to fit into the proper local
storage allocated on the stack, without having to guess a suboptimal
access size at compile time.

Also, in case the helpers accepting the UNKNOWN_VALUE register operate
in raw mode, disable the raw mode so that the program is required to
initialize all memory, since there is no guarantee the helper will fill
it completely, leaving possibilities for data leak (just relevant when
the memory used by the helper is the stack, not when using a pointer to
map element value or packet). In other words, ARG_PTR_TO_RAW_STACK will
be treated as ARG_PTR_TO_STACK.

Signed-off-by: Gianluca Borello <g.borello@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agobpf: allow adjusted map element values to spill
Gianluca Borello [Mon, 9 Jan 2017 18:19:48 +0000 (10:19 -0800)]
bpf: allow adjusted map element values to spill

commit 484611357c19 ("bpf: allow access into map value arrays")
introduces the ability to do pointer math inside a map element value via
the PTR_TO_MAP_VALUE_ADJ register type.

The current support doesn't handle the case where a PTR_TO_MAP_VALUE_ADJ
is spilled into the stack, limiting several use cases, especially when
generating bpf code from a compiler.

Handle this case by explicitly enabling the register type
PTR_TO_MAP_VALUE_ADJ to be spilled. Also, make sure that min_value and
max_value are reset just for BPF_LDX operations that don't result in a
restore of a spilled register from stack.

Signed-off-by: Gianluca Borello <g.borello@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agobpf: allow helpers access to map element values
Gianluca Borello [Mon, 9 Jan 2017 18:19:47 +0000 (10:19 -0800)]
bpf: allow helpers access to map element values

Enable helpers to directly access a map element value by passing a
register type PTR_TO_MAP_VALUE (or PTR_TO_MAP_VALUE_ADJ) to helper
arguments ARG_PTR_TO_STACK or ARG_PTR_TO_RAW_STACK.

This enables several use cases. For example, a typical tracing program
might want to capture pathnames passed to sys_open() with:

struct trace_data {
char pathname[PATHLEN];
};

SEC("kprobe/sys_open")
void bpf_sys_open(struct pt_regs *ctx)
{
struct trace_data data;
bpf_probe_read(data.pathname, sizeof(data.pathname), ctx->di);

/* consume data.pathname, for example via
 * bpf_trace_printk() or bpf_perf_event_output()
 */
}

Such a program could easily hit the stack limit in case PATHLEN needs to
be large or more local variables need to exist, both of which are quite
common scenarios. Allowing direct helper access to map element values,
one could do:

struct bpf_map_def SEC("maps") scratch_map = {
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
.key_size = sizeof(u32),
.value_size = sizeof(struct trace_data),
.max_entries = 1,
};

SEC("kprobe/sys_open")
int bpf_sys_open(struct pt_regs *ctx)
{
int id = 0;
struct trace_data *p = bpf_map_lookup_elem(&scratch_map, &id);
if (!p)
return;
bpf_probe_read(p->pathname, sizeof(p->pathname), ctx->di);

/* consume p->pathname, for example via
 * bpf_trace_printk() or bpf_perf_event_output()
 */
}

And wouldn't risk exhausting the stack.

Code changes are loosely modeled after commit 6841de8b0d03 ("bpf: allow
helpers access the packet directly"). Unlike with PTR_TO_PACKET, these
changes just work with ARG_PTR_TO_STACK and ARG_PTR_TO_RAW_STACK (not
ARG_PTR_TO_MAP_KEY, ARG_PTR_TO_MAP_VALUE, ...): adding those would be
trivial, but since there is not currently a use case for that, it's
reasonable to limit the set of changes.

Also, add new tests to make sure accesses to map element values from
helpers never go out of boundary, even when adjusted.

Signed-off-by: Gianluca Borello <g.borello@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agobpf: split check_mem_access logic for map values
Gianluca Borello [Mon, 9 Jan 2017 18:19:46 +0000 (10:19 -0800)]
bpf: split check_mem_access logic for map values

Move the logic to check memory accesses to a PTR_TO_MAP_VALUE_ADJ from
check_mem_access() to a separate helper check_map_access_adj(). This
enables to use those checks in other parts of the verifier as well,
where boundaries on PTR_TO_MAP_VALUE_ADJ might need to be checked, for
example when checking helper function arguments. The same thing is
already happening for other types such as PTR_TO_PACKET and its
check_packet_access() helper.

The code has been copied verbatim, with the only difference of removing
the "off += reg->max_value" statement and moving the sum into the call
statement to check_map_access(), as that was only needed due to the
earlier common check_map_access() call.

Signed-off-by: Gianluca Borello <g.borello@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'net-smc'
David S. Miller [Mon, 9 Jan 2017 21:07:41 +0000 (16:07 -0500)]
Merge branch 'net-smc'

Ursula Braun says:

====================
net/smc: Shared Memory Communications - RDMA

here is now V4 of the SMC-R patches having processed your feedback from end
of November. The most important change is the replacement of sysfs by a
generic netlink solution in patch 04. And I tried to get rid of the __packed
attributes. There are still a few usages left due to SMC-R protocol defined
structures.

V4 changes:
The order of patches 03 and 04 for pnet table management and SMC IB-client
establishing has been exchanged, since pnet table management is now built on
top of smc_ib_devices.
Patch 01: Use EXPORT_SYMBOL_GPL().
Patch 02: Define "use_fallback" as bool.
          Get rid of useless smc_sock fields clearing in smc_sock_alloc(),
          since sk_alloc() clears out the memory.
Patch 03: Postpone smc_ib_remember_port_attr() call till ib_device is
          mentioned in the pnet table.
Patch 04: Replace sysfs-usage by a generic netlink approach for pnet table
          configuration.
          Change layout of pnet table entries to reference net_device and
          ib_device instead of dealing with names of net_devices and
          ib_devices.
Patch 05: Adapt "use_fallback" usages to new type bool.
          Get rid of useless smc_sock fields clearing in smc_sock_alloc()
          Avoid __packed where possible.
          Check if clc responses are not too big.
Patch 09: Postpone smc_setup_per_ibdev till the first connection with this
          ib_device is really created.
Patch 11: Get rid of __packed usage.

V3 changes:
Patch 05: Remove unneeded DEFINE_WAIT
Patch 06: Improve synchronization of link group creation
Patch 07: Rename peer_rmbe_len into peer_rmbe_size to be more consistent
Patch 09: Avoid calls of ib_get_memory_region with IB_ACCESS_LOCAL_WRITE,
          use new default local_dma_lkey from protection domain as lkey
          instead.
          Remove no longer needed function smc_ib_dereg_memory_region().
Patch 14: Switch to state ACTIVE only if still in state INIT.
          Return 0 for recvmsg invoked in a socket closing state.
          Allow getname call in state APPCLOSEWAIT1
          Do not trigger destruction of a socket-in-error queued in accept
          queue.
          During cleanup of accept queue, make sure sockets are destructed,
          and sockets in fallback mode are handled appropriately.
          When freeing sndbufs/rmbs, remove them from their list and free
          the entry.
          Use add_wait_queue() and remove_wait_queue() in close wait
          functions.
          If actively closing a socket in state for PEERFINCLOSEWAIT, keep
          this state.
          If passively closing a socket while bytes are to be received, move
          to state APPCLOSEWAIT1.
          If actively aborting a socket, skip sending the close_abort flag,
          since RDMA communication is no longer possible.
          When terminating a link group, do not schedule link group freeing a
          2nd time, since already done when unregistering the last remaining
          connection.
Patch 15: Introduce smc_diag module for monitoring SMC protocol sockets.
          This replaces the old patch 0015 dealing with procfs.

V2 changes:
Patch 0002: Add SMC versions for family key strings in net/core/sock.c.
Patch 0006: initialize rb_tree.
Patch 0007: Get rid of unneeded use of xchg() in smc_sndbuf_unuse() and
            smc_rmb_unuse().
Patch 0008: Correct error checking logic for ib_function calls.
            Define struct smc_link field wr_tx_id as atomic_long_t.
            Use "do_div" instead of "%" to be architecture-independent.
Patch 0009: Correct error checking logic for ib_function calls.
Patch 0011: Remove xchg() calls in cursor handling. Use atomic64_t for cursor
            overlays on 64-bit architectures. If not available, use plain u64
            and add locking for cursor reading and writing.
            Implement smc_curs_add() without modulo operator "%".
Patch 0012: Remove xchg() calls in cursor handling.
            Implement smc_tx_rdma_writes() without module operator "%".
Patch 0013: Remove xchg() calls in cursor handling.
Patch 0014: Return type bool in smc_wr_tx_has_pending().
            Remove unneeded semicolon in smc_close_shutdown_write().
            Call smc_close_active() in non-fallback case only.
            Get rid of duplicate schedule of sock_put_work().
            Take nested sock_lock in smc_listen_work().
            Start close stream_wait in case of prepared sends only.
Patch 0015: Remove unneeded socket ref_count in smc_proc_seq_show().
            Take lock before list_empty check in smc_proc_sock_list_del().

These patches are the initial part of the implementation of the
"Shared Memory Communications-RDMA" (SMC-R) protocol as defined in
RFC7609 [1]. While SMC-R does not aim to replace TCP,
it taps a wealth of existing data center TCP socket applications
to become more efficient without the need for rewriting them.
SMC-R uses RDMA over Converged Ethernet (RoCE) to save CPU consumption.
For instance, when running 10 parallel connections with uperf, we measured
a decrease of 60% in CPU consumption with SMC-R compared to TCP/IP
(with throughput and latency comparable;
measured on x86_64 with the same RoCE card and port).

SMC-R does not require an RDMA communication manager (RDMA CM).

SMC-R inherits TCP qualities such as reliable connections, host-based
firewall packet filtering (on connection establishment) and unmodified
application of communication encryption such as TLS (transport layer
security) or SSL (secure sockets layer). Since original TCP is used to
establish SMC-R connections, load balancers and packet inspection based
on TCP/IP connection establishment continue to work for SMC-R.

On the other hand, using SMC-R implies:
- either involving a preload library when invoking the unchanged TCP-application
  or slightly modifying the source by simply changing the socket family in
  the socket() call
- accepting extra overhead and latency in connection establishment due to
  SMC Connection Layer Control (CLC) handshake
- explicit coupling of RoCE ports with Ethernet ports
- not routable as currently built on RoCE V1
- bypassing of packet-based networking features
    - filtering (netfilter)
    - sniffing (libpcap, packet sockets, (E)BPF)
    - traffic control (scheduling, shaping)
- bypassing of IP-header based socket options
- bypassing of memory buffer (pressure) management
- unusable together with IPsec

Overview of the SMC-R Protocol described in informational RFC 7609

SMC-R is an open protocol that provides RDMA capabilities over RoCE
transparently for applications exploiting TCP sockets.
A new socket protocol family PF_SMC is introduced.
There are no changes required to applications using the sockets API for TCP
stream sockets other than the specification of the new socket family AF_SMC.
Unmodified applications can be used by means of a dynamic preload shared
library which rewrites the socket API call
socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) into
socket(AF_SMC,  SOCK_STREAM, IPPROTO_TCP).
SMC-R re-uses the address family AF_INET for all addressing purposes around
struct sockaddr.

SMC-R system architecture layers:

+=============================================================================+
|                                      | unmodified TCP application           |
| native SMC application               +--------------------------------------+
|                                      | dynamic preload shared library       |
+=============================================================================+
|                                 SMC socket                                  |
+-----------------------------------------------------------------------------+
|                    | TCP socket (for connection establishment and fallback) |
| IB verbs           +--------------------------------------------------------+
|                    | IP                                                     |
+--------------------+--------------------------------------------------------+
| RoCE device driver | some network device driver                             |
+=============================================================================+

Terms:

A link group is determined by an ordered peer pair of TCP client and TCP server
(IP addresses and subnet). Reversed client server roles cause an own link group.
A link is a logical point-to-point connection based on an
infiniband reliable connected queue pair (RC-QP) between two RoCE ports
(MACs and GIDs) of a peer pair.
A link group can have 1..8 links for failover and load balancing.
This initial Linux implementation always has 1 link per link group.
Each link group on a peer can have 1..255 remote memory buffers (RMBs).
If more RMBs are needed, a peer can open another link group
(this initial Linux implementation) or fall back to TCP.
Each RMB has its own particular size and its own (R)DMA mapping and credentials
(rtoken consisting of rkey and RDMA "virtual address").
This initial Linux implementation uses physically contiguous memory for RMBs
but we are working towards scattered memory because of memory fragmentation.
Each RMB has 1..255 RMB elements (RMBEs) of equal size
to provide multiplexing of connections within an RMB.
An RMBE is the RDMA Write destination organized as wrapping ring buffer
for data transmit of a particular connection in one direction
(duplex by means of mirror symmetry as with TCP).
This initial Linux implementation always has 1 RMBE per RMB
and thus an individual RMB for each connection.

SMC-R connection establishment with subsequent data transfer:

   CLIENT                                                   SERVER

TCP three-way handshake:
                         regular TCP SYN
      -------------------------------------------------------->
                       regular TCP SYN ACK
      <--------------------------------------------------------
                         regular TCP ACK
      -------------------------------------------------------->

SMC Connection Layer Control (CLC) handshake
exchanges RDMA credentials between peers:
             via above TCP connection: SMC CLC Proposal
      -------------------------------------------------------->
              via above TCP connection: SMC CLC Accept
      <--------------------------------------------------------
             via above TCP connection: SMC CLC Confirm
      -------------------------------------------------------->

SMC Link Layer Control (LLC) (only once per link, i.e. 1st conn. of link group):
                 RoCE RC-QP: SMC LLC Confirm Link
      <========================================================
             RoCE RC-QP: SMC LLC Confirm Link response
      ========================================================>

SMC data transmission (incl. SMC Connection Data Control (CDC) message):
                       RoCE RC-QP: RDMA Write
      ========================================================>
             RoCE RC-QP: SMC CDC message (flow control)
      ========================================================>
                          ...

                       RoCE RC-QP: RDMA Write
      <========================================================
             RoCE RC-QP: SMC CDC message (flow control)
      <========================================================
                          ...

Data flow within an established connection:

+----------------------------------------------------------------------------
|            SENDER
| sendmsg()
|    |
|    | produces into sndbuf [sender's process context]
|    v
| +--------+
| | sndbuf | [ring buffer]
| +--------+
|    |
|    | consumes from sndbuf and produces into receiver's RMBE [any context]
|    | by sending RDMA Write followed by SMC CDC message over RoCE RC-QP
|    |
+----|-----------------------------------------------------------------------
     |
+----|-----------------------------------------------------------------------
|    v       RECEIVER
| +------+
| | RMBE | [ring buffer, can have size different from sender's sndbuf]
| |      | [RMBE represents rcvbuf, no further de-coupling as on sender side]
| +------+
|    |
|    | consumes from RMBE [receiver's process context]
|    v
| recvmsg()
+----------------------------------------------------------------------------

Flow control ("cursor" updates) by means of SMC CDC messages:

               SENDER                            RECEIVER

        sends updates via CDC-------------+   sends updates via CDC
        on consuming from sndbuf          |   on consuming from RMBE
        and producing into RMBE           |   by means of recvmsg()
                                          |            |
                                          |            |
      +-----------------------------------|------------+
      |                                   |
   +--v-------------------------+      +--v-----------------------+
   | receiver's consumer cursor |      | sender's producer cursor----+
   +----------------|-----------+      +--------------------------+  |
                    |                                                |
                    |                        receiver's RMBE         |
                    |                  +--------------------------+  |
                    |                  |                          |  |
                    +--------------------------------+            |  |
                                       |             |            |  |
                                       |             v            |  |
                                       |             +------------|  |
                                       |-------------+////////////|  |
                                       |//RDMA data written by////|  |
                                       |////sender that is////////|  |
                                       |/available to be consumed/|  |
                                       |///////// +---------------|  |
                                       |----------+^              |  |
                                       |           |              |  |
                                       |           +-----------------+
                                       |                          |
                                       +--------------------------+

Sending updates of the producer cursor is immediate for low latency;
something like Nagle's algorithm (absence of TCP_NODELAY) is optional and
currently not part of this initial Linux implementation.
Sending updates of the consumer cursor is conditional to avoid the
silly window syndrome.

Normal connection termination:

Normal connection termination starts transitioning from socket state
ACTIVE via either "Active Close" or "Passive Close".

shutdown rdwr               +-----------------+
or close,   +-------------->|  INIT / CLOSED  |<-------------+
send PeerCon|nClosed        +-----------------+              | PeerConnClosed
            |                       |                        | received
            |            connection | established            |
            |                       V                        |
    +----------------+     +-----------------+     +----------------+
    |AppFinCloseWait |     |     ACTIVE      |     |PeerFinCloseWait|
    +----------------+     +-----------------+     +----------------+
            |                   |         |                   |
            |     Active Close: |         |Passive Close:     |
            |     close or      |         |PeerConnClosed or  |
            |     shutdown wr or|         |PeerDoneWriting    |
            |     shutdown rdwr |         |received           |

    |                   V         V                   |
 PeerConnClo|sed    +--------------+   +-------------+        | close or
 received   +--<----|PeerCloseWait1|   |AppCloseWait1|--->----+ shutdown rdwr,
            |       +--------------+   +-------------+        | send
            |  PeerDoneWri|ting                | shutdown wr, | PeerConnClosed
            |  received   |            send Pee|rDoneWriting  |
            |             V                    V              |
            |       +--------------+   +-------------+        |
            +--<----|PeerCloseWait2|   |AppCloseWait2|--->----+
                    +--------------+   +-------------+

In state CLOSED, the socket can be destructed only, once the application has
issued a close().

Abnormal connection termination:

                            +-----------------+
            +-------------->|  INIT / CLOSED  |<-------------+
            |               +-----------------+              |
            |                                                |
            |           +-----------------------+            |
            |           |     Any state         |            |
 PeerConnAbo|rt         | (before setting       |            | send
 received   |           |  PeerConnClosed       |            | PeerConnAbort
            |           |  indicator in         |            |
            |           |  peer's RMBE)         |            |
            |           +-----------------------+            |
            |                   |         |                  |
            |     Active Abort: |         | Passive Abort:   |
            |     problem,      |         | PeerConnAbort    |
            |     send          |         | received,        |
            |     PeerConnAbort,|         | ECONNRESET       |
            |     ECONNABORTED  |         |                  |
            |                   V         V                  |
            |       +--------------+   +--------------+      |
            +-------|PeerAbortWait |   | ProcessAbort |------+
                    +--------------+   +--------------+

Implementation notes beyond RFC 7609:

A PNET table in sysfs provides the mapping between network device names and
RoCE Infiniband device names for the transparent switch of data communication.
A PNET table can contain an arbitrary number of PNETIDs.
Each PNETID contains exactly one (Ethernet) network device name
and one or more RoCE Infiniband device names.
Each device name can only exist in at most one PNETID (no overlapping).
This initial Linux implementation allows at most one RoCE Infiniband device
name per PNETID.
After a new TCP connection is established, the network device name
used for egress traffic with the TCP connection's local source IP address
is used as key to lookup the unique PNETID, and the RoCE Infiniband device
of this PNETID is used to switch data communication from TCP to RDMA
during SMC CLC handshake.

Problem determination:

A protocol dissector is available with upstream wireshark for formatting
SMC-R related RoCE LAN traffic.
[https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob;f=epan/dissectors/packet-smcr.c]

We are working on enhancing the Linux implementation to cover:

- Improve default socket closing asynchronicity
- Address corner cases with many parallel connections
- Tracing
- Integrated load balancing and fail-over within a link group
- Splice and sendpage support
- IPv6 addressing support
- Keepalive, Cork
- Namespaces support
- Urgent data
- More socket options
- Diagnostics
- Statistics support
- SNMP support

References:

[1] SMC-R Informational RFC: http://www.rfc-editor.org/info/rfc7609
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: netlink interface for SMC sockets
Ursula Braun [Mon, 9 Jan 2017 15:55:26 +0000 (16:55 +0100)]
smc: netlink interface for SMC sockets

Support for SMC socket monitoring via netlink sockets of protocol
NETLINK_SOCK_DIAG.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: socket closing and linkgroup cleanup
Ursula Braun [Mon, 9 Jan 2017 15:55:25 +0000 (16:55 +0100)]
smc: socket closing and linkgroup cleanup

smc_shutdown() and smc_release() handling
delayed linkgroup cleanup for linkgroups without connections

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: receive data from RMBE
Ursula Braun [Mon, 9 Jan 2017 15:55:24 +0000 (16:55 +0100)]
smc: receive data from RMBE

move RMBE data into user space buffer and update managing cursors

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: send data (through RDMA)
Ursula Braun [Mon, 9 Jan 2017 15:55:23 +0000 (16:55 +0100)]
smc: send data (through RDMA)

copy data to kernel send buffer, and trigger RDMA write

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: connection data control (CDC)
Ursula Braun [Mon, 9 Jan 2017 15:55:22 +0000 (16:55 +0100)]
smc: connection data control (CDC)

send and receive CDC messages (via IB message send and CQE)

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: link layer control (LLC)
Ursula Braun [Mon, 9 Jan 2017 15:55:21 +0000 (16:55 +0100)]
smc: link layer control (LLC)

send and receive LLC messages CONFIRM_LINK (via IB message send and CQE)

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: initialize IB transport incl. PD, MR, QP, CQ, event, WR
Ursula Braun [Mon, 9 Jan 2017 15:55:20 +0000 (16:55 +0100)]
smc: initialize IB transport incl. PD, MR, QP, CQ, event, WR

Prepare the link for RDMA transport:
Create a queue pair (QP) and move it into the state Ready-To-Receive (RTR).

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: work request (WR) base for use by LLC and CDC
Ursula Braun [Mon, 9 Jan 2017 15:55:19 +0000 (16:55 +0100)]
smc: work request (WR) base for use by LLC and CDC

The base containers for RDMA transport are work requests and completion
queue entries processed through Infiniband verbs:
* allocate and initialize these areas
* map these areas to DMA
* implement the basic communication consisting of work request posting
  and receival of completion queue events

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: remote memory buffers (RMBs)
Ursula Braun [Mon, 9 Jan 2017 15:55:18 +0000 (16:55 +0100)]
smc: remote memory buffers (RMBs)

* allocate data RMB memory for sending and receiving
* size depends on the maximum socket send and receive buffers
* allocated RMBs are kept during life time of the owning link group
* map the allocated RMBs to DMA

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: connection and link group creation
Ursula Braun [Mon, 9 Jan 2017 15:55:17 +0000 (16:55 +0100)]
smc: connection and link group creation

* create smc_connection for SMC-sockets
* determine suitable link group for a connection
* create a new link group if necessary

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: CLC handshake (incl. preparation steps)
Ursula Braun [Mon, 9 Jan 2017 15:55:16 +0000 (16:55 +0100)]
smc: CLC handshake (incl. preparation steps)

* CLC (Connection Layer Control) handshake

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: establish pnet table management
Thomas Richter [Mon, 9 Jan 2017 15:55:15 +0000 (16:55 +0100)]
smc: establish pnet table management

Connection creation with SMC-R starts through an internal
TCP-connection. The Ethernet interface for this TCP-connection is not
restricted to the Ethernet interface of a RoCE device. Any existing
Ethernet interface belonging to the same physical net can be used, as
long as there is a defined relation between the Ethernet interface and
some RoCE devices. This relation is defined with the help of an
identification string called "Physical Net ID" or short "pnet ID".
Information about defined pnet IDs and their related Ethernet
interfaces and RoCE devices is stored in the SMC-R pnet table.

A pnet table entry consists of the identifying pnet ID and the
associated network and IB device.
This patch adds pnet table configuration support using the
generic netlink message interface referring to network and IB device
by their names. Commands exist to add, delete, and display pnet table
entries, and to flush or display the entire pnet table.

There are cross-checks to verify whether the ethernet interfaces
or infiniband devices really exist in the system. If either device
is not available, the pnet ID entry is not created.
Loss of network devices and IB devices is also monitored;
a pnet ID entry is removed when an associated network or
IB device is removed.

Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: introduce SMC as an IB-client
Ursula Braun [Mon, 9 Jan 2017 15:55:14 +0000 (16:55 +0100)]
smc: introduce SMC as an IB-client

* create a list of SMC IB-devices

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosmc: establish new socket family
Ursula Braun [Mon, 9 Jan 2017 15:55:13 +0000 (16:55 +0100)]
smc: establish new socket family

* enable smc module loading and unloading
 * register new socket family
 * basic smc socket creation and deletion
 * use backing TCP socket to run CLC (Connection Layer Control)
   handshake of SMC protocol
 * Setup for infiniband traffic is implemented in follow-on patches.
   For now fallback to TCP socket is always used.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: introduce keepalive function in struct proto
Ursula Braun [Mon, 9 Jan 2017 15:55:12 +0000 (16:55 +0100)]
net: introduce keepalive function in struct proto

Direct call of tcp_set_keepalive() function from protocol-agnostic
sock_setsockopt() function in net/core/sock.c violates network
layering. And newly introduced protocol (SMC-R) will need its own
keepalive function. Therefore, add "keepalive" function pointer
to "struct proto", and call it from sock_setsockopt() via this pointer.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'sh_eth-wol'
David S. Miller [Mon, 9 Jan 2017 20:55:18 +0000 (15:55 -0500)]
Merge branch 'sh_eth-wol'

Niklas Söderlund says:

====================
sh_eth: add wake-on-lan support via magic packet

This series adds support for Wake-on-Lan using Magic Packet for a few
models of the sh_eth driver. Patch 1/6 fix a naming error, patch 2/6
adds generic support to control and support WoL while patches 3/6 - 6/6
enable different models.

Based ontop of net-next master.

Changes since v2.
- Fix bookkeeping for "active_count" and "event_count" reported in
  /sys/kernel/debug/wakeup_sources. Thanks Geert for noticing this.
- Add new patch 1/6 which corrects the name of ECMR_MPDE bit, suggested
  by Sergei.
- s/sh7743/sh7734/ in patch 5/6. Thanks Geert for spotting this.
- Spelling improvements suggested by Sergei and Geert.
- Add Tested-by to 3/6 and 4/6.

Changes since v1.
- Split generic WoL functionality and device enablement to different
  patches.
- Enable more devices then Gen2 after feedback from Geert and
  datasheets.
- Do not set mdp->irq_enabled = false and remove specific MagicPacket
  interrupt clearing, instead let sh_eth_error() clear the interrupt as
  for other EMAC interrupts, thanks Sergei for the suggestion.
- Use the original return logic in sh_eth_resume().
- Moved sh_eth_private variable *clk to top of data structure  to avoid
  possible gaps due to alignment restrictions.
- Make wol_enabled in sh_eth_private part of the already existing
  bitfield instead of a bool.
- Do not initiate mdp->wol_enabled to 0, the struct is kzalloc'ed so
  it's already set to 0.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: enable wake-on-lan for sh7763
Niklas Söderlund [Mon, 9 Jan 2017 15:34:09 +0000 (16:34 +0100)]
sh_eth: enable wake-on-lan for sh7763

This is based on public datasheet for sh7763 which shows it has the
same behavior and registers for WoL as other versions of sh_eth.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: enable wake-on-lan for sh7734
Niklas Söderlund [Mon, 9 Jan 2017 15:34:08 +0000 (16:34 +0100)]
sh_eth: enable wake-on-lan for sh7734

This is based on public datasheet for sh7734 which shows it has the
same behavior and registers for WoL as other versions of sh_eth.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: enable wake-on-lan for r8a7740/armadillo
Niklas Söderlund [Mon, 9 Jan 2017 15:34:07 +0000 (16:34 +0100)]
sh_eth: enable wake-on-lan for r8a7740/armadillo

Geert Uytterhoeven reported WoL worked on his Armadillo board.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: enable wake-on-lan for R-Car Gen2 devices
Niklas Söderlund [Mon, 9 Jan 2017 15:34:06 +0000 (16:34 +0100)]
sh_eth: enable wake-on-lan for R-Car Gen2 devices

Tested on Gen2 r8a7791/Koelsch.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: add generic wake-on-lan support via magic packet
Niklas Söderlund [Mon, 9 Jan 2017 15:34:05 +0000 (16:34 +0100)]
sh_eth: add generic wake-on-lan support via magic packet

Add generic functionality to support Wake-on-LAN using MagicPacket which
are supported by at least a few versions of sh_eth. Only add
functionality for WoL, no specific sh_eth versions are marked to support
WoL yet.

WoL is enabled in the suspend callback by setting MagicPacket detection
and disabling all interrupts expect MagicPacket. In the resume path the
driver needs to reset the hardware to rearm the WoL logic, this prevents
the driver from simply restoring the registers and to take advantage of
that sh_eth was not suspended to reduce resume time. To reset the
hardware the driver closes and reopens the device just like it would do
in a normal suspend/resume scenario without WoL enabled, but it both
closes and opens the device in the resume callback since the device
needs to be open for WoL to work.

One quirk needed for WoL is that the module clock needs to be prevented
from being switched off by Runtime PM. To keep the clock alive the
suspend callback need to call clk_enable() directly to increase the
usage count of the clock. Then when Runtime PM decreases the clock usage
count it won't reach 0 and be switched off.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: use correct name for ECMR_MPDE bit
Niklas Söderlund [Mon, 9 Jan 2017 15:34:04 +0000 (16:34 +0100)]
sh_eth: use correct name for ECMR_MPDE bit

This bit was wrongly named due to a typo, Sergei checked the SH7734/63
manuals and this bit should be named MPDE.

Suggested-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'icmp-reply-optimize'
David S. Miller [Mon, 9 Jan 2017 20:49:13 +0000 (15:49 -0500)]
Merge branch 'icmp-reply-optimize'

Jesper Dangaard Brouer says:

====================
net: optimize ICMP-reply code path

This patchset is optimizing the ICMP-reply code path, for ICMP packets
that gets rate limited. A remote party can easily trigger this code
path by sending packets to port number with no listening service.

Generally the patchset moves the sysctl_icmp_msgs_per_sec ratelimit
checking to earlier in the code path and removes an allocation.

Use-case: The specific case I experienced this being a bottleneck is,
sending UDP packets to a port with no listener, which obviously result
in kernel replying with ICMP Destination Unreachable (type:3), Port
Unreachable (code:3), which cause the bottleneck.

 After Eric and Paolo optimized the UDP socket code, the kernels PPS
processing capabilities is lower for no-listen ports, than normal UDP
sockets.  This is bad for capacity planning when restarting a service.

UDP no-listen benchmark 8xCPUs using pktgen_sample04_many_flows.sh:
 Baseline: 6.6 Mpps
 Patch:   14.7 Mpps
Driver mlx5 at 50Gbit/s.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: for rate-limited ICMP replies save one atomic operation
Jesper Dangaard Brouer [Mon, 9 Jan 2017 15:04:14 +0000 (16:04 +0100)]
net: for rate-limited ICMP replies save one atomic operation

It is possible to avoid the atomic operation in icmp{v6,}_xmit_lock,
by checking the sysctl_icmp_msgs_per_sec ratelimit before these calls,
as pointed out by Eric Dumazet, but the BH disabled state must be correct.

The icmp_global_allow() call states it must be called with BH
disabled.  This protection was given by the calls icmp_xmit_lock and
icmpv6_xmit_lock.  Thus, split out local_bh_disable/enable from these
functions and maintain it explicitly at callers.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: reduce cycles spend on ICMP replies that gets rate limited
Jesper Dangaard Brouer [Mon, 9 Jan 2017 15:04:09 +0000 (16:04 +0100)]
net: reduce cycles spend on ICMP replies that gets rate limited

This patch split the global and per (inet)peer ICMP-reply limiter
code, and moves the global limit check to earlier in the packet
processing path.  Thus, avoid spending cycles on ICMP replies that
gets limited/suppressed anyhow.

The global ICMP rate limiter icmp_global_allow() is a good solution,
it just happens too late in the process.  The kernel goes through the
full route lookup (return path) for the ICMP message, before taking
the rate limit decision of not sending the ICMP reply.

Details: The kernels global rate limiter for ICMP messages got added
in commit 4cdf507d5452 ("icmp: add a global rate limitation").  It is
a token bucket limiter with a global lock.  It brilliantly avoids
locking congestion by only updating when 20ms (HZ/50) were elapsed. It
can then avoids taking lock when credit is exhausted (when under
pressure) and time constraint for refill is not yet meet.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoRevert "icmp: avoid allocating large struct on stack"
Jesper Dangaard Brouer [Mon, 9 Jan 2017 15:04:04 +0000 (16:04 +0100)]
Revert "icmp: avoid allocating large struct on stack"

This reverts commit 9a99d4a50cb8 ("icmp: avoid allocating large struct
on stack"), because struct icmp_bxm no really a large struct, and
allocating and free of this small 112 bytes hurts performance.

Fixes: 9a99d4a50cb8 ("icmp: avoid allocating large struct on stack")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge tag 'rxrpc-rewrite-20170109' of git://git.kernel.org/pub/scm/linux/kernel/git...
David S. Miller [Mon, 9 Jan 2017 20:47:52 +0000 (15:47 -0500)]
Merge tag 'rxrpc-rewrite-20170109' of git://git./linux/kernel/git/dhowells/linux-fs

David Howells says:

====================
afs: Refcount afs_call struct

These patches provide some tracepoints for AFS and fix a potential leak by
adding refcounting to the afs_call struct.

The patches are:

 (1) Add some tracepoints for logging incoming calls and monitoring
     notifications from AF_RXRPC and data reception.

 (2) Get rid of afs_wait_mode as it didn't turn out to be as useful as
     initially expected.  It can be brought back later if needed.  This
     clears some stuff out that I don't then need to fix up in (4).

 (3) Allow listen(..., 0) to be used to disable listening.  This makes
     shutting down the AFS cache manager server in the kernel much easier
     and the accounting simpler as we can then be sure that (a) all
     preallocated afs_call structs are relesed and (b) no new incoming
     calls are going to be started.

     For the moment, listening cannot be reenabled.

 (4) Add refcounting to the afs_call struct to fix a potential multiple
     release detected by static checking and add a tracepoint to follow the
     lifecycle of afs_call objects.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'dsa_swqitch_ops-const'
David S. Miller [Mon, 9 Jan 2017 20:44:57 +0000 (15:44 -0500)]
Merge branch 'dsa_swqitch_ops-const'

Florian Fainelli says:

====================
net: dsa: Make dsa_switch_ops const

This patch series allows us to annotate dsa_switch_ops with a const
qualifier.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: dsa: Make dsa_switch_ops const
Florian Fainelli [Sun, 8 Jan 2017 22:52:08 +0000 (14:52 -0800)]
net: dsa: Make dsa_switch_ops const

Now that we have properly encapsulated and made drivers utilize exported
functions, we can switch dsa_switch_ops to be a annotated with const.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: dsa: Encapsulate legacy switch drivers into dsa_switch_driver
Florian Fainelli [Sun, 8 Jan 2017 22:52:07 +0000 (14:52 -0800)]
net: dsa: Encapsulate legacy switch drivers into dsa_switch_driver

In preparation for making struct dsa_switch_ops const, encapsulate it
within a dsa_switch_driver which has a list pointer and a pointer to
dsa_switch_ops. This allows us to take the list_head pointer out of
dsa_switch_ops, which is written to by {un,}register_switch_driver.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: dsa: bcm_sf2: Declare our own dsa_switch_ops
Florian Fainelli [Sun, 8 Jan 2017 22:52:06 +0000 (14:52 -0800)]
net: dsa: bcm_sf2: Declare our own dsa_switch_ops

Utilize the b53 exported functions to fill our bcm_sf2_ops structure,
also making it clear what we utilize and what we specifically override.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: dsa: b53: Export most operations to other drivers
Florian Fainelli [Sun, 8 Jan 2017 22:52:05 +0000 (14:52 -0800)]
net: dsa: b53: Export most operations to other drivers

In preparation for making dsa_switch_ops const, export b53 operations
utilized by other drivers such as bcm_sf2.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'sh_eth-csum'
David S. Miller [Mon, 9 Jan 2017 20:40:57 +0000 (15:40 -0500)]
Merge branch 'sh_eth-csum'

Sergei Shtylyov says:

====================
sh_eth: "intgelligent checksum" related cleanups

   Here's a set of 2 patches against DaveM's 'net.git' repo, as they are based
on a couple patches merged there recently; however, the patches are destined
for 'net-next.git' (once 'net.git' gets merged there next time). I'm cleaning
up the "intelligent checksum" related code (however, the driver only disables
this feature for now, theres's no proper offload supprt yet).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: rename 'sh_eth_cpu_data::hw_crc'
Sergei Shtylyov [Fri, 6 Jan 2017 21:03:37 +0000 (00:03 +0300)]
sh_eth: rename 'sh_eth_cpu_data::hw_crc'

The 'struct sh_eth_cpu_data' field indicating the "intelligent checksum"
support was misnamed 'hw_crc' -- rename it to 'hw_checksum'.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosh_eth: get rid of 'sh_eth_cpu_data::shift_rd0'
Sergei Shtylyov [Fri, 6 Jan 2017 21:02:52 +0000 (00:02 +0300)]
sh_eth: get rid of 'sh_eth_cpu_data::shift_rd0'

After checking all  the available manuals,  I have enough information to
conclude  that the 'shift_rd0' flag is only relevant  for the Ether cores
supporting so called "intelligent checksum" (and hence having CSMR) which
is indicated  by the 'hw_crc' flag.  Since  all the relevant SoCs now have
both these flags set, we can  at last  get  rid of the former flag...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
David S. Miller [Mon, 9 Jan 2017 20:39:11 +0000 (15:39 -0500)]
Merge git://git./linux/kernel/git/davem/net

7 years agophy state machine: failsafe leave invalid RUNNING state
Zefir Kurtisi [Fri, 6 Jan 2017 11:14:48 +0000 (12:14 +0100)]
phy state machine: failsafe leave invalid RUNNING state

While in RUNNING state, phy_state_machine() checks for link changes by
comparing phydev->link before and after calling phy_read_status().
This works as long as it is guaranteed that phydev->link is never
changed outside the phy_state_machine().

If in some setups this happens, it causes the state machine to miss
a link loss and remain RUNNING despite phydev->link being 0.

This has been observed running a dsa setup with a process continuously
polling the link states over ethtool each second (SNMPD RFC-1213
agent). Disconnecting the link on a phy followed by a ETHTOOL_GSET
causes dsa_slave_get_settings() / dsa_slave_get_link_ksettings() to
call phy_read_status() and with that modify the link status - and
with that bricking the phy state machine.

This patch adds a fail-safe check while in RUNNING, which causes to
move to CHANGELINK when the link is gone and we are still RUNNING.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Linus Torvalds [Mon, 9 Jan 2017 19:58:28 +0000 (11:58 -0800)]
Merge git://git./linux/kernel/git/davem/net

Pull networking fixes from David Miller:

 1) Fix dumping of nft_quota entries, from Pablo Neira Ayuso.

 2) Fix out of bounds access in nf_tables discovered by KASAN, from
    Florian Westphal.

 3) Fix IRQ enabling in dp83867 driver, from Grygorii Strashko.

 4) Fix unicast filtering in be2net driver, from Ivan Vecera.

 5) tg3_get_stats64() can race with driver close and ethtool
    reconfigurations, fix from Michael Chan.

 6) Fix error handling when pass limit is reached in bpf code gen on
    x86. From Daniel Borkmann.

 7) Don't clobber switch ops and use proper MDIO nested reads and writes
    in bcm_sf2 driver, from Florian Fainelli.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (21 commits)
  net: dsa: bcm_sf2: Utilize nested MDIO read/write
  net: dsa: bcm_sf2: Do not clobber b53_switch_ops
  net: stmmac: fix maxmtu assignment to be within valid range
  bpf: change back to orig prog on too many passes
  tg3: Fix race condition in tg3_get_stats64().
  be2net: fix unicast list filling
  be2net: fix accesses to unicast list
  netlabel: add CALIPSO to the list of built-in protocols
  vti6: fix device register to report IFLA_INFO_KIND
  net: phy: dp83867: fix irq generation
  amd-xgbe: Fix IRQ processing when running in single IRQ mode
  sh_eth: R8A7740 supports packet shecksumming
  sh_eth: fix EESIPR values for SH77{34|63}
  r8169: fix the typo in the comment
  nl80211: fix sched scan netlink socket owner destruction
  bridge: netfilter: Fix dropping packets that moving through bridge interface
  netfilter: ipt_CLUSTERIP: check duplicate config when initializing
  netfilter: nft_payload: mangle ckecksum if NFT_PAYLOAD_L4CSUM_PSEUDOHDR is set
  netfilter: nf_tables: fix oob access
  netfilter: nft_queue: use raw_smp_processor_id()
  ...

7 years agoMerge branch 'dwmac-dwc-qos-eth'
David S. Miller [Mon, 9 Jan 2017 19:54:30 +0000 (14:54 -0500)]
Merge branch 'dwmac-dwc-qos-eth'

Joao Pinto says:

====================
adding new glue driver dwmac-dwc-qos-eth

This patch set contains the porting of the synopsys/dwc_eth_qos.c driver
to the stmmac structure. This operation resulted in the creation of a new
platform glue driver called dwmac-dwc-qos-eth which was based in the
dwc_eth_qos as is.

dwmac-dwc-qos-eth inherited dwc_eth_qos DT bindings, to assure that current
and old users can continue to use it as before. We can see this driver as
being deprecated, since all new development will be done in stmmac.

Please check each patch for implementation details.
====================

Tested-by: Niklas Cassel <niklas.cassel@axis.com>
Reviewed-by: Lars Persson <larper@axis.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agostmmac: adding new glue driver dwmac-dwc-qos-eth
jpinto [Mon, 9 Jan 2017 12:35:10 +0000 (12:35 +0000)]
stmmac: adding new glue driver dwmac-dwc-qos-eth

This patch adds a new glue driver called dwmac-dwc-qos-eth which
was based in the dwc_eth_qos as is. To assure retro-compatibility a slight
tweak was also added to stmmac_platform.

Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Tested-by: Niklas Cassel <niklas.cassel@axis.com>
Reviewed-by: Lars Persson <larper@axis.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agostmmac: move stmmac_clk, pclk, clk_ptp_ref and stmmac_rst to platform structure
jpinto [Mon, 9 Jan 2017 12:35:09 +0000 (12:35 +0000)]
stmmac: move stmmac_clk, pclk, clk_ptp_ref and stmmac_rst to platform structure

This patch moves stmmac_clk, pclk, clk_ptp_ref and stmmac_rst to the
plat_stmmacenet_data structure. It also moves these platform variables
initialization to stmmac_platform. This was done for two reasons:

a) If PCI is used, platform related code is being executed in stmmac_main
resulting in warnings that have no sense and conceptually was not right

b) stmmac as a synopsys reference ethernet driver stack will be hosting
more and more drivers to its structure like synopsys/dwc_eth_qos.c.
These drivers have their own DT bindings that are not compatible with
stmmac's. One of the most important are the clock names, and so they need
to be parsed in the glue logic and initialized there, and that is the main
reason why the clocks were passed to the platform structure.

Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Tested-by: Niklas Cassel <niklas.cassel@axis.com>
Reviewed-by: Lars Persson <larper@axis.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agostmmac: adding DT parameter for LPI tx clock gating
jpinto [Mon, 9 Jan 2017 12:35:08 +0000 (12:35 +0000)]
stmmac: adding DT parameter for LPI tx clock gating

This patch adds a new parameter to the stmmac DT: snps,en-tx-lpi-clockgating.
It was ported from synopsys/dwc_eth_qos.c and it is useful if lpi tx clock
gating is needed by stmmac users also.

Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Tested-by: Niklas Cassel <niklas.cassel@axis.com>
Reviewed-by: Lars Persson <larper@axis.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoalx: add feature flag for rx checksumming
Tobias Regnery [Mon, 9 Jan 2017 12:15:55 +0000 (13:15 +0100)]
alx: add feature flag for rx checksumming

The code to handle rx checksumming was in the driver since its introduction
but for reasons unknown the feature flag was left out. Now it is possible
to enable this feature with ethtool.

Tested on my AR8161 ethernet card, there are no regressions observed in
netperf if this feature is enabled.

Signed-off-by: Tobias Regnery <tobias.regnery@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'act_csum-sctp'
David S. Miller [Mon, 9 Jan 2017 19:36:58 +0000 (14:36 -0500)]
Merge branch 'act_csum-sctp'

Davide Caratti says:

====================
net/sched: act_csum: add support for SCTP checksum

This series extends current act_csum functionality to allow computation of
SCTP checksums. Patch 1 ensures LIBCRC32C will be selected if NET_ACT_CSUM
is selected. Patch 2 extends act_csum to handle IPPROTO_SCTP protocol in
IPv4/IPv6 header, and eventually compute the CRC32c value.

v2:
- style fix in tc_csum.h
- avoid nested if statement in act_csum.c
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet/sched: act_csum: compute crc32c on SCTP packets
Davide Caratti [Mon, 9 Jan 2017 10:24:21 +0000 (11:24 +0100)]
net/sched: act_csum: compute crc32c on SCTP packets

modify act_csum to compute crc32c on IPv4/IPv6 packets having SCTP in
their payload, and extend UAPI definitions accordingly.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet/sched: Kconfig: select LIBCRC32C if NET_ACT_CSUM is selected
Davide Caratti [Mon, 9 Jan 2017 10:24:20 +0000 (11:24 +0100)]
net/sched: Kconfig: select LIBCRC32C if NET_ACT_CSUM is selected

LIBCRC32C is needed to compute crc32c on SCTP packets.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'mlxsw-small-driver-update'
David S. Miller [Mon, 9 Jan 2017 19:35:15 +0000 (14:35 -0500)]
Merge branch 'mlxsw-small-driver-update'

Jiri Pirko says:

====================
mlxsw: small driver update

This patchset contains various small "non-net" fixes and enhancements.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agomlxsw: spectrum: Change ENOTSUPP to EOPNOTSUPP
Yotam Gigi [Mon, 9 Jan 2017 10:25:48 +0000 (11:25 +0100)]
mlxsw: spectrum: Change ENOTSUPP to EOPNOTSUPP

As ENOTSUPP is specific to NFS, change the return error value to
EOPNOTSUPP in various places in the mlxsw driver.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agomlxsw: spectrum: Fix order of commands in port remove function
Yotam Gigi [Mon, 9 Jan 2017 10:25:47 +0000 (11:25 +0100)]
mlxsw: spectrum: Fix order of commands in port remove function

Fix the order of the free directives to match the port init function

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agomlxsw: spectrum: Make the add_matchall_tc_entry symmetric
Yotam Gigi [Mon, 9 Jan 2017 10:25:46 +0000 (11:25 +0100)]
mlxsw: spectrum: Make the add_matchall_tc_entry symmetric

Currently, the mlxsw spectrum driver only supports offloading the matchall
classifier together with the mirred action. To allow more matchall tc
offloads, make the code symmetric so that it can be easily extended later
on for other actions.

Signed-off-by: Yotam Gigi <yotamg@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agomlxsw: cmd: Fix API name comments for event-queues
Elad Raz [Mon, 9 Jan 2017 10:25:45 +0000 (11:25 +0100)]
mlxsw: cmd: Fix API name comments for event-queues

Probably some copy-paste error from "int_msix" that caused "int_" prefix to
appear in the comments for all "eq_" APIs.

Signed-off-by: Elad Raz <eladr@mellanox.com>
Acked-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agomlxsw: Fix mlxsw_i2c_write return value
Elad Raz [Mon, 9 Jan 2017 10:25:44 +0000 (11:25 +0100)]
mlxsw: Fix mlxsw_i2c_write return value

The "err" variable is been checked, return always 0.

Signed-off-by: Elad Raz <eladr@mellanox.com>
Acked-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Vadim Pasternak <vadimp@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: ethernet: ti: cpsw: extend limits for cpsw_get/set_ringparam
Ivan Khoronzhuk [Sun, 8 Jan 2017 20:12:27 +0000 (22:12 +0200)]
net: ethernet: ti: cpsw: extend limits for cpsw_get/set_ringparam

Allow to set number of descs close to possible values. In case of
minimum limit it's equal to number of channels to be able to set
at least one desc per channel. For maximum limit leave enough descs
number for tx channels.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agocls_u32: don't bother explicitly initializing ->divisor to zero
Alexandru Moise [Sun, 8 Jan 2017 16:49:46 +0000 (18:49 +0200)]
cls_u32: don't bother explicitly initializing ->divisor to zero

This struct member is already initialized to zero upon root_ht's
allocation via kzalloc().

Signed-off-by: Alexandru Moise <00moses.alexander00@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agoMerge branch 'siphash'
David S. Miller [Mon, 9 Jan 2017 18:58:58 +0000 (13:58 -0500)]
Merge branch 'siphash'

Jason A. Donenfeld says:

====================
Introduce The SipHash PRF

This patch series introduces SipHash into the kernel. SipHash is a
cryptographically secure PRF, which serves a variety of functions, and is
introduced in patch #1. The following patch #2 introduces HalfSipHash,
an optimization suitable for hash tables only. Finally, the last two patches
in this series show two usages of the introduced siphash function family.
It is expected that after this initial introduction, other usages will follow.

Please read the extensive descriptions in patch #1 and patch #2 of what these
functions do and the various levels of assurances. They're products of intense
cryptographic research, and I believe they're suitable for the uses outlined
herein.

The use of SipHash is not limited to the networking subsystem -- indeed I
would like to use it in other places too in the kernel. But after discussing
with a few on this list and at Linus' suggestion, the initial import of these
functions is coming through the networking tree. After these are merged, it
will then be easier to expand use elsewhere.

Changes v2->v3:
  - hsiphash keys now simply use an unsigned long, in order to avoid
    a cluttered ifdef and make it a bit more clear what's happening.
  - A typo in the documentation has been fixed.
  - The documentation has been augmented with an example relating to struct
    packing and passing.
  - The net_secret variable is now __read_mostly.

Hopefully this is the last of the required revisions, and v3 can be merged
into net-next.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosyncookies: use SipHash in place of SHA1
Jason A. Donenfeld [Sun, 8 Jan 2017 12:54:03 +0000 (13:54 +0100)]
syncookies: use SipHash in place of SHA1

SHA1 is slower and less secure than SipHash, and so replacing syncookie
generation with SipHash makes natural sense. Some BSDs have been doing
this for several years in fact.

The speedup should be similar -- and even more impressive -- to the
speedup from the sequence number fix in this series.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosecure_seq: use SipHash in place of MD5
Jason A. Donenfeld [Sun, 8 Jan 2017 12:54:02 +0000 (13:54 +0100)]
secure_seq: use SipHash in place of MD5

This gives a clear speed and security improvement. Siphash is both
faster and is more solid crypto than the aging MD5.

Rather than manually filling MD5 buffers, for IPv6, we simply create
a layout by a simple anonymous struct, for which gcc generates
rather efficient code. For IPv4, we pass the values directly to the
short input convenience functions.

64-bit x86_64:
[    1.683628] secure_tcpv6_sequence_number_md5# cycles: 99563527
[    1.717350] secure_tcp_sequence_number_md5# cycles: 92890502
[    1.741968] secure_tcpv6_sequence_number_siphash# cycles: 67825362
[    1.762048] secure_tcp_sequence_number_siphash# cycles: 67485526

32-bit x86:
[    1.600012] secure_tcpv6_sequence_number_md5# cycles: 103227892
[    1.634219] secure_tcp_sequence_number_md5# cycles: 94732544
[    1.669102] secure_tcpv6_sequence_number_siphash# cycles: 96299384
[    1.700165] secure_tcp_sequence_number_siphash# cycles: 86015473

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Miller <davem@davemloft.net>
Cc: David Laight <David.Laight@aculab.com>
Cc: Tom Herbert <tom@herbertland.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosiphash: implement HalfSipHash1-3 for hash tables
Jason A. Donenfeld [Sun, 8 Jan 2017 12:54:01 +0000 (13:54 +0100)]
siphash: implement HalfSipHash1-3 for hash tables

HalfSipHash, or hsiphash, is a shortened version of SipHash, which
generates 32-bit outputs using a weaker 64-bit key. It has *much* lower
security margins, and shouldn't be used for anything too sensitive, but
it could be used as a hashtable key function replacement, if the output
is never exposed, and if the security requirement is not too high.

The goal is to make this something that performance-critical jhash users
would be willing to use.

On 64-bit machines, HalfSipHash1-3 is slower than SipHash1-3, so we alias
SipHash1-3 to HalfSipHash1-3 on those systems.

64-bit x86_64:
[    0.509409] test_siphash:     SipHash2-4 cycles: 4049181
[    0.510650] test_siphash:     SipHash1-3 cycles: 2512884
[    0.512205] test_siphash: HalfSipHash1-3 cycles: 3429920
[    0.512904] test_siphash:    JenkinsHash cycles:  978267
So, we map hsiphash() -> SipHash1-3

32-bit x86:
[    0.509868] test_siphash:     SipHash2-4 cycles: 14812892
[    0.513601] test_siphash:     SipHash1-3 cycles:  9510710
[    0.515263] test_siphash: HalfSipHash1-3 cycles:  3856157
[    0.515952] test_siphash:    JenkinsHash cycles:  1148567
So, we map hsiphash() -> HalfSipHash1-3

hsiphash() is roughly 3 times slower than jhash(), but comes with a
considerable security improvement.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agosiphash: add cryptographically secure PRF
Jason A. Donenfeld [Sun, 8 Jan 2017 12:54:00 +0000 (13:54 +0100)]
siphash: add cryptographically secure PRF

SipHash is a 64-bit keyed hash function that is actually a
cryptographically secure PRF, like HMAC. Except SipHash is super fast,
and is meant to be used as a hashtable keyed lookup function, or as a
general PRF for short input use cases, such as sequence numbers or RNG
chaining.

For the first usage:

There are a variety of attacks known as "hashtable poisoning" in which an
attacker forms some data such that the hash of that data will be the
same, and then preceeds to fill up all entries of a hashbucket. This is
a realistic and well-known denial-of-service vector. Currently
hashtables use jhash, which is fast but not secure, and some kind of
rotating key scheme (or none at all, which isn't good). SipHash is meant
as a replacement for jhash in these cases.

There are a modicum of places in the kernel that are vulnerable to
hashtable poisoning attacks, either via userspace vectors or network
vectors, and there's not a reliable mechanism inside the kernel at the
moment to fix it. The first step toward fixing these issues is actually
getting a secure primitive into the kernel for developers to use. Then
we can, bit by bit, port things over to it as deemed appropriate.

While SipHash is extremely fast for a cryptographically secure function,
it is likely a bit slower than the insecure jhash, and so replacements
will be evaluated on a case-by-case basis based on whether or not the
difference in speed is negligible and whether or not the current jhash usage
poses a real security risk.

For the second usage:

A few places in the kernel are using MD5 or SHA1 for creating secure
sequence numbers, syn cookies, port numbers, or fast random numbers.
SipHash is a faster and more fitting, and more secure replacement for MD5
in those situations. Replacing MD5 and SHA1 with SipHash for these uses is
obvious and straight-forward, and so is submitted along with this patch
series. There shouldn't be much of a debate over its efficacy.

Dozens of languages are already using this internally for their hash
tables and PRFs. Some of the BSDs already use this in their kernels.
SipHash is a widely known high-speed solution to a widely known set of
problems, and it's time we catch-up.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Jean-Philippe Aumasson <jeanphilippe.aumasson@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet: ipv4: remove disable of bottom half in inet_rtm_getroute
David Ahern [Sun, 8 Jan 2017 04:04:23 +0000 (20:04 -0800)]
net: ipv4: remove disable of bottom half in inet_rtm_getroute

Nothing about the route lookup requires bottom half to be disabled.
Remove the local_bh_disable ... local_bh_enable around ip_route_input.
This appears to be a vestige of days gone by as it has been there
since the beginning of git time.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
7 years agonet/mlx5: Activate support for 4K UARs
Eli Cohen [Tue, 3 Jan 2017 21:55:28 +0000 (23:55 +0200)]
net/mlx5: Activate support for 4K UARs

Activate 4K UAR support for firmware versions that support it.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>