Implements the infrastructure for MPTCP sockets.

MPTCP sockets open one in-kernel TCP socket per subflow. These subflow
sockets are only managed by the MPTCP socket that owns them and are not
visible from userspace. This commit allows a userspace program to open
an MPTCP socket with:

  sock = socket(AF_INET, SOCK_STREAM, IPPROTO_MPTCP);

The resulting socket is simply a wrapper around a single regular TCP
socket, without any of the MPTCP protocol implemented over the wire.
Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Co-developed-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com>
Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Nikolay Aleksandrov says:

====================
net: bridge: add per-vlan state option

This set adds the first per-vlan option - state, which uses the new vlan
infrastructure that was recently added. It gives us forwarding control on
per-vlan basis. The first 3 patches prepare the vlan code to support option
dumping and modification. We still compress vlan ranges which have equal
options, each new option will have to add its own equality check to
br_vlan_opts_eq(). The vlans are created in forwarding state by default to
be backwards compatible and vlan state is considered only when the port
state is forwarding (more info in patch 4).
I'll send the selftest for the vlan state with the iproute2 patch-set.

v2: patch 3: do full (all-vlan) notification only on vlan
    create/delete, otherwise use the per-vlan notifications only,
    rework how option change ranges are detected, add more verbose error
    messages when setting options and add checks if a vlan should be used.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

The first per-vlan option added is state, it is needed for EVPN and for
per-vlan STP. The state allows to control the forwarding on per-vlan
basis. The vlan state is considered only if the port state is forwarding
in order to avoid conflicts and be consistent. br_allowed_egress is
called only when the state is forwarding, but the ingress case is a bit
more complicated due to the fact that we may have the transition between
port:BR_STATE_FORWARDING -> vlan:BR_STATE_LEARNING which should still
allow the bridge to learn from the packet after vlan filtering and it will
be dropped after that. Also to optimize the pvid state check we keep a
copy in the vlan group to avoid one lookup. The state members are
modified with *_ONCE() to annotate the lockless access.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch adds support for option modification of single vlans and
ranges. It allows to only modify options, i.e. skip create/delete by
using the BRIDGE_VLAN_INFO_ONLY_OPTS flag. When working with a range
option changes we try to pack the notifications as much as possible.

v2: do full port (all vlans) notification only when creating/deleting
    vlans for compatibility, rework the range detection when changing
    options, add more verbose extack errors and check if a vlan should
    be used (br_vlan_should_use checks)
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We'll be dumping the options for the whole range if they're equal. The
first range vlan will be used to extract the options. The commit doesn't
change anything yet it just adds the skeleton for the support. The dump
will happen when the first option is added.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If we make sure that br_allowed_egress is called only when we have
BR_STATE_FORWARDING state then we can avoid a test later when we add
per-vlan state.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Saeed Mahameed says:

====================
mlx5-updates-2020-01-22

This series provides updates to mlx5 driver.
1) Misc small cleanups
2) Some SW steering updates including header copy support
3) Full ethtool statistics support for E-Switch uplink representor
Some refactoring was required to share the bare-metal NIC ethtool
stats with the Uplink representor. On Top of this Vlad converts the
ethtool stats support in E-Swtich vports representors to use the mlx5e
"stats groups" infrastructure and then applied all applicable stats
to the uplink representor netdev.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Dan Murphy says:

====================
Add PHY IDs for DP83825/6

Adding new PHY IDs for the DP83825 and DP83826 TI Ethernet PHYs to the DP83822
PHY driver.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add PHY IDs for the DP83825CS, DP83825CM and the DP83825S devices to the
DP83822 driver.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add phy IDs to the DP83822 phy driver for the DP83826N
and the DP83826NC devices.  The register map and features
are the same for basic enablement.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Gautam Ramakrishnan says:

====================
net: sched: add Flow Queue PIE packet scheduler

Flow Queue PIE packet scheduler

This patch series implements the Flow Queue Proportional
Integral controller Enhanced (FQ-PIE) active queue
Management algorithm. It is an enhancement over the PIE
algorithm. It integrates the PIE aqm with a deficit round robin
scheme.

FQ-PIE is implemented over the latest version of PIE which
uses timestamps to calculate queue delay with an additional
option of using average dequeue rate to calculate the queue
delay. This patch also adds a memory limit of all the packets
across all queues to a default value of 32Mb.

 - Patch #1
   - Creates pie.h and moves all small functions and structures
     common to PIE and FQ-PIE here. The functions are all made
     inline.
 - Patch #2 - #8
   - Addresses code formatting, indentation, comment changes
     and rearrangement of structure members.
 - Patch #9
   - Refactors sch_pie.c by changing arguments to
     calculate_probability(), [pie_]drop_early() and
     pie_process_dequeue() to make it generic enough to
     be used by sch_fq_pie.c. These functions are exported
     to be used by sch_fq_pie.c.
 - Patch #10
   - Adds the FQ-PIE Qdisc.

For more information:
https://tools.ietf.org/html/rfc8033

Changes from v6 to v7
 - Call tcf_block_put() when destroying the Qdisc as suggested
   by Jakub Kicinski.

Changes from v5 to v6
 - Rearranged struct members according to their access pattern
   and to remove holes.

Changes from v4 to v5
 - This patch series breaks down patch 1 of v4 into
   separate logical commits as suggested by David Miller.

Changes from v3 to v4
 - Used non deprecated version of nla_parse_nested
 - Used SZ_32M macro
 - Removed an unused variable
 - Code cleanup
 All suggested by Jakub and Toke.

Changes from v2 to v3
 - Exported drop_early, pie_process_dequeue and
   calculate_probability functions from sch_pie as
   suggested by Stephen Hemminger.

Changes from v1 ( and RFC patch) to v2
 - Added timestamp to calculate queue delay as recommended
   by Dave Taht
 - Packet memory limit implemented as recommended by Toke.
 - Added external classifier as recommended by Toke.
 - Used NET_XMIT_CN instead of NET_XMIT_DROP as the return
   value in the fq_pie_qdisc_enqueue function.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Principles:
  - Packets are classified on flows.
  - This is a Stochastic model (as we use a hash, several flows might
                                be hashed to the same slot)
  - Each flow has a PIE managed queue.
  - Flows are linked onto two (Round Robin) lists,
    so that new flows have priority on old ones.
  - For a given flow, packets are not reordered.
  - Drops during enqueue only.
  - ECN capability is off by default.
  - ECN threshold (if ECN is enabled) is at 10% by default.
  - Uses timestamps to calculate queue delay by default.

Usage:
tc qdisc ... fq_pie [ limit PACKETS ] [ flows NUMBER ]
                    [ target TIME ] [ tupdate TIME ]
                    [ alpha NUMBER ] [ beta NUMBER ]
                    [ quantum BYTES ] [ memory_limit BYTES ]
                    [ ecnprob PERCENTAGE ] [ [no]ecn ]
                    [ [no]bytemode ] [ [no_]dq_rate_estimator ]

defaults:
  limit: 10240 packets, flows: 1024
  target: 15 ms, tupdate: 15 ms (in jiffies)
  alpha: 1/8, beta : 5/4
  quantum: device MTU, memory_limit: 32 Mb
  ecnprob: 10%, ecn: off
  bytemode: off, dq_rate_estimator: off
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Sachin D. Patil <sdp.sachin@gmail.com>
Signed-off-by: V. Saicharan <vsaicharan1998@gmail.com>
Signed-off-by: Mohit Bhasi <mohitbhasi1998@gmail.com>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch makes the drop_early(), calculate_probability() and
pie_process_dequeue() functions generic enough to be used by
both PIE and FQ-PIE (to be added in a future commit). The major
change here is in the way the functions take in arguments. This
patch exports these functions and makes FQ-PIE dependent on
sch_pie.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make the alignment in the initialization of the struct instances
consistent in the file.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Fix punctuation and logical mistakes in the comments. The
logical mistake was that "dequeue_rate" is no longer the default
way to calculate queuing delay and is not needed. The default
way to calculate queue delay was changed in commit cec2975f
("net: sched: pie: enable timestamp based delay calculation").
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Improve the comments along with the commenting style used to
describe the members of the structures and their initial values
in the init functions.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rearrange the members of the structure such that closely
referenced members appear together and/or fit in the same
cacheline. Also, change the order of their initializations to
match the order in which they appear in the structure.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Linux best practice recommends using u8 for true/false values in
structures.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rearrange macros in order of length and align the values to
improve readability.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use the U64_MAX macro to denote the constant (2^64 - 1).
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch moves macros, structures and small functions common
to PIE and FQ-PIE (to be added in a future commit) from the file
net/sched/sch_pie.c to the header file include/net/pie.h.
All the moved functions are made inline.
Signed-off-by: Mohit P. Tahiliani <tahiliani@nitk.edu.in>
Signed-off-by: Leslie Monis <lesliemonis@gmail.com>
Signed-off-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Convert suitable drivers to use new helper phy_do_ioctl_running.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Acked-by: Timur Tabi <timur@kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alexei Starovoitov says:

====================
pull-request: bpf-next 2020-01-22

The following pull-request contains BPF updates for your *net-next* tree.

We've added 92 non-merge commits during the last 16 day(s) which contain
a total of 320 files changed, 7532 insertions(+), 1448 deletions(-).

The main changes are:

1) function by function verification and program extensions from Alexei.

2) massive cleanup of selftests/bpf from Toke and Andrii.

3) batched bpf map operations from Brian and Yonghong.

4) tcp congestion control in bpf from Martin.

5) bulking for non-map xdp_redirect form Toke.

6) bpf_send_signal_thread helper from Yonghong.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Extend stats group array of uplink representor with all stats that are
available for PF in legacy mode, besides ipsec and TLS which are not
supported.

Don't output vport stats for uplink representor because they are already
handled by 802_3 group (with different names: {tx|rx}_{bytes|packets}_phy).
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Q counters were disabled for all types of representors to prevent an issue
where there is not enough resources to init q counters for 127 representor
instances. Enable q counters only for uplink representors to support
"rx_out_of_buffer", "rx_if_down_packets" counters in ethtool.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

In order to support all of the supported stats that are available in legacy
mode for switchdev uplink representors, convert rep stats infrastructure to
reuse struct mlx5e_stats_grp that is already used when device is in legacy
mode. Refactor rep code to use array of mlx5e_stats_grp
structures (constructed using macros provided by stats infra) to
fill/update stats, instead of fixed hardcoded set of values. This approach
allows to easily extend representors with new stats types.
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Don't copy all of the stats groups used for mlx5e ethernet NIC profile,
have a separate stats groups for IPoIB with the set of the needed stats
only.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Convert stats groups array to array of "stats group" pointers to allow
sharing and individual selection of groups per profile as illustrated in
the next patches.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>

Introduce new macros to declare stats callbacks and groups, for better
code reuse and for individual groups selection per profile which will be
introduced in next patches.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>

Attach stats groups array to the profiles and make the stats utility
functions (get_num, update, fill, fill_strings) generic and use the
profile->stats_grps rather the hardcoded NIC stats groups.

This will allow future extension to have per profile stats groups.

In this patch mlx5e NIC and IPoIB will still share the same stats
groups.
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>

Clean up the code and allows to call uplink rep init/cleanup
from different location later.
To be used later for a new uplink representor mode.
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Eli Britstein <elibr@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Allow connecting SW steering source table to a lower/same level
destination table.
Lifting this limitation is required to support Connection Tracking.
Signed-off-by: Yevgeny Kliteynik <kliteyn@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Modify header supports ADD/SET and from this patch
also COPY. Copy allows to copy header fields and
metadata.
Signed-off-by: Hamdan Igbaria <hamdani@mellanox.com>
Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Modify set actions are not supported on both tx
and rx, added a check for that.
Also refactored the code in a way that every modify
action has his own functions, this needed so in the
future we could add copy action more smoothly.
Signed-off-by: Hamdan Igbaria <hamdani@mellanox.com>
Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

In the flowtables offload all the devices in the flowtables
share the same flow_block. An offload rule will be installed on
all the devices. This scenario is not correct.

It is no problem if there are only two devices in the flowtable,
The rule with ingress and egress on the same device can be reject
by driver.

But more than two devices in the flowtable will install the wrong
rules on hardware.

For example:
Three devices in a offload flowtables: dev_a, dev_b, dev_c

A rule ingress from dev_a and egress to dev_b:
The rule will install on device dev_a.
The rule will try to install on dev_b but failed for ingress
and egress on the same device.
The rule will install on dev_c. This is not correct.

The flowtables offload avoid this case through restricting the ingress dev
with FLOW_DISSECTOR_KEY_META.

So the mlx5e driver also should support the FLOW_DISSECTOR_KEY_META parse.
Signed-off-by: wenxu <wenxu@ucloud.cn>
Acked-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Fix the following sparse warning:
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads_chains.c:35:20: warning: symbol 'ESW_POOLS' was not declared. Should it be static?

Fixes: 39ac237c ("net/mlx5: E-Switch, Refactor chains and priorities")
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Acked-by: Paul Blakey <paulb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

since mlx5 hardware can segment correctly TSO packets on VXLAN over VLAN
topologies, CPU usage can improve significantly if we enable tunnel
offloads in dev->vlan_features, like it was done in the past with other
NIC drivers (e.g. mlx4, be2net and ixgbe).
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Use "%zu" for size_t. Seen on ARM allmodconfig:

drivers/net/ethernet/mellanox/mlx5/core/wq.c: In function 'mlx5_wq_cyc_wqe_dump':
include/linux/kern_levels.h:5:18: warning: format '%ld' expects argument of type 'long int', but argument 5 has type 'size_t' {aka 'unsigned int'} [-Wformat=]

Fixes: 130c7b46 ("net/mlx5e: TX, Dump WQs wqe descriptors on CQE with error events")
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

Martin KaFai Lau says:

====================
This set adds bpf_cubic.c example.  It was separated from the
earlier BPF STRUCT_OPS series.  Some highlights since the
last post:

1. It is based on EricD recent fixes to the kernel tcp_cubic. [1]
2. The bpf jiffies reading helper is inlined by the verifier.
   Different from the earlier version, it only reads jiffies alone
   and does not do usecs/jiffies conversion.
3. The bpf .kconfig map is used to read CONFIG_HZ.

[1]: https://patchwork.ozlabs.org/cover/1215066/

v3:
- Remove __weak from CONFIG_HZ in patch 3. (Andrii)

v2:
- Move inlining to fixup_bpf_calls() in patch 1. (Daniel)
- It is inlined for 64 BITS_PER_LONG and jit_requested
  as the map_gen_lookup().  Other cases could be
  considered together with map_gen_lookup() if needed.
- Use usec resolution in bictcp_update() calculation in patch 3.
  usecs_to_jiffies() is then removed().  (Eric)
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

This patch adds a bpf_cubic example.  Some highlights:
1. CONFIG_HZ .kconfig map is used.
2. In bictcp_update(), calculation is changed to use usec
   resolution (i.e. USEC_PER_JIFFY) instead of using jiffies.
   Thus, usecs_to_jiffies() is not used in the bpf_cubic.c.
3. In bitctcp_update() [under tcp_friendliness], the original
   "while (ca->ack_cnt > delta)" loop is changed to the equivalent
   "ca->ack_cnt / delta" operation.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200122233658.903774-1-kafai@fb.com