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  1. 26 Jan, 2021 16 commits
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  7. 23 Jan, 2021 17 commits
    • Jakub Kicinski's avatar
      Merge branch 'remove-unneeded-phy-time-stamping-option' · 692347a9
      Jakub Kicinski authored 
      Richard Cochran says:

====================
Remove unneeded PHY time stamping option.

The NETWORK_PHY_TIMESTAMPING configuration option adds additional
checks into the networking hot path, and it is only needed by two
rather esoteric devices, namely the TI DP83640 PHYTER and the ZHAW
InES 1588 IP core.  Very few end users have these devices, and those
that do have them are building specialized embedded systems.

Unfortunately two unrelated drivers depend on this option, and two
defconfigs enable it.  It is probably my fault for not paying enough
attention in reviews.

This series corrects the gratuitous use of NETWORK_PHY_TIMESTAMPING.
====================

Link: https://lore.kernel.org/r/cover.1611198584.git.richardcochran@gmail.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      692347a9
    • Richard Cochran's avatar
      net: mvpp2: Remove unneeded Kconfig dependency. · 04cbb740
      Richard Cochran authored 
      The mvpp2 is an Ethernet driver, and it implements MAC style time
stamping of PTP frames.  It has no need of the expensive option to
enable PHY time stamping.  Remove the incorrect dependency.
Signed-off-by: default avatarRichard Cochran <richardcochran@gmail.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      04cbb740
    • Richard Cochran's avatar
      net: dsa: mv88e6xxx: Remove bogus Kconfig dependency. · 57ba0077
      Richard Cochran authored 
      The mv88e6xxx is a DSA driver, and it implements DSA style time
stamping of PTP frames.  It has no need of the expensive option to
enable PHY time stamping.  Remove the bogus dependency.
Signed-off-by: default avatarRichard Cochran <richardcochran@gmail.com>
Acked-by: default avatarBrandon Streiff <brandon.streiff@ni.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      57ba0077
    • Jakub Kicinski's avatar
      Merge branch 'net-ipa-napi-poll-updates' · e7b76db3
      Jakub Kicinski authored 
      Alex Elder says:

====================
net: ipa: NAPI poll updates

While reviewing the IPA NAPI polling code in detail I found two
problems.  This series fixes those, and implements a few other
improvements to this part of the code.

The first two patches are minor bug fixes that avoid extra passes
through the poll function.  The third simplifies code inside the
polling loop a bit.

The last two update how interrupts are disabled; previously it was
possible for another I/O completion condition to be recorded before
NAPI got scheduled.
====================

Link: https://lore.kernel.org/r/20210121114821.26495-1-elder@linaro.orgSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      e7b76db3
    • Alex Elder's avatar
      net: ipa: disable IEOB interrupts before clearing · 7bd9785f
      Alex Elder authored 
      Currently in gsi_isr_ieob(), event ring IEOB interrupts are disabled
one at a time.  The loop disables the IEOB interrupt for all event
rings represented in the event mask.  Instead, just disable them all
at once.

Disable them all *before* clearing the interrupt condition.  This
guarantees we'll schedule NAPI for each event once, before another
IEOB interrupt could be signaled.
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      7bd9785f
    • Alex Elder's avatar
      net: ipa: repurpose gsi_irq_ieob_disable() · 5725593e
      Alex Elder authored 
      Rename gsi_irq_ieob_disable() to be gsi_irq_ieob_disable_one().

Introduce a new function gsi_irq_ieob_disable() that takes a mask of
events to disable rather than a single event id.  This will be used
in the next patch.

Rename gsi_irq_ieob_enable() to be gsi_irq_ieob_enable_one() to be
consistent.
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      5725593e
    • Alex Elder's avatar
      net: ipa: have gsi_channel_update() return a value · 223f5b34
      Alex Elder authored 
      Have gsi_channel_update() return the first transaction in the
updated completed transaction list, or NULL if no new transactions
have been added.
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      223f5b34
    • Alex Elder's avatar
      net: ipa: heed napi_complete() return value · 148604e7
      Alex Elder authored 
      Pay attention to the return value of napi_complete(), completing
polling only if it returns true.

Just use napi rather than &channel->napi as the argument passed to
napi_complete().
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      148604e7
    • Alex Elder's avatar
      net: ipa: count actual work done in gsi_channel_poll() · c80c4a1e
      Alex Elder authored 
      There is an off-by-one problem in gsi_channel_poll().  The count of
transactions completed is incremented each time through the loop
*before* determining whether there is any more work to do.  As a
result, if we exit the loop early the counter its value is one more
than the number of transactions actually processed.

Instead, increment the count after processing, to ensure it reflects
the number of processed transactions.  The result is more naturally
described as a for loop rather than a while loop, so change that.
Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      c80c4a1e
    • Jakub Kicinski's avatar
      Merge branch 'mlxsw-expose-number-of-physical-ports' · 59a49d96
      Jakub Kicinski authored 
      Ido Schimmel says:

====================
mlxsw: Expose number of physical ports

The switch ASIC has a limited capacity of physical ports that it can
support. While each system is brought up with a different number of
ports, this number can be increased via splitting up to the ASIC's
limit.

Expose physical ports as a devlink resource so that user space will have
visibility into the maximum number of ports that can be supported and
the current occupancy. With this resource it is possible, for example,
to write generic (i.e., not platform dependent) tests for port
splitting.

Patch #1 adds the new resource and patch #2 adds a selftest.

v2:
* Add the physical ports resource as a generic devlink resource so that
  it could be re-used by other device drivers
====================

Link: https://lore.kernel.org/r/20210121131024.2656154-1-idosch@idosch.orgSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      59a49d96
    • Danielle Ratson's avatar
      selftests: mlxsw: Add a scale test for physical ports · 5154b1b8
      Danielle Ratson authored 
      Query the maximum number of supported physical ports using devlink-resource
and test that this number can be reached by splitting each of the
splittable ports to its width. Test that an error is returned in case
the maximum number is exceeded.
Signed-off-by: default avatarDanielle Ratson <danieller@nvidia.com>
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      5154b1b8
    • Danielle Ratson's avatar
      mlxsw: Register physical ports as a devlink resource · 321f7ab0
      Danielle Ratson authored 
      The switch ASIC has a limited capacity of physical ('flavour physical'
in devlink terminology) ports that it can support. While each system is
brought up with a different number of ports, this number can be
increased via splitting up to the ASIC's limit.

Expose physical ports as a devlink resource so that user space will have
visibility to the maximum number of ports that can be supported and the
current occupancy.

In addition, add a "Generic Resources" section in devlink-resource
documentation so the different drivers will be aligned by the same resource
name when exposing to user space.
Signed-off-by: default avatarDanielle Ratson <danieller@nvidia.com>
Reviewed-by: default avatarJiri Pirko <jiri@nvidia.com>
Signed-off-by: default avatarIdo Schimmel <idosch@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      321f7ab0
    • Jakub Kicinski's avatar
      Merge branch 'htb-offload' · 35187642
      Jakub Kicinski authored 
      Maxim Mikityanskiy says:

====================
HTB offload

This series adds support for HTB offload to the HTB qdisc, and adds
usage to mlx5 driver.

The previous RFCs are available at [1], [2].

The feature is intended to solve the performance bottleneck caused by
the single lock of the HTB qdisc, which prevents it from scaling well.
The HTB algorithm itself is offloaded to the device, eliminating the
need to take the root lock of HTB on every packet. Classification part
is done in clsact (still in software) to avoid acquiring the lock, which
imposes a limitation that filters can target only leaf classes.

The speedup on Mellanox ConnectX-6 Dx was 14.2 times in the UDP
multi-stream test, compared to software HTB implementation (more details
in the mlx5 patch).

[1]: https://www.spinics.net/lists/netdev/msg628422.html
[2]: https://www.spinics.net/lists/netdev/msg663548.html

v2 changes:

Fixed sparse and smatch warnings. Formatted HTB patches to 80 chars per
line.

v3 changes:

Fixed the CI failure on parisc with 16-bit xchg by replacing it with
WRITE_ONCE. Fixed the capability bits in mlx5_ifc.h and the value of
MLX5E_QOS_MAX_LEAF_NODES.

v4 changes:

Check if HTB is root when offloading. Add extack for hardware errors.
Rephrase explanations of how it works in the commit message. Remove %hu
from format strings. Add resiliency when leaf_del_last fails to create a
new leaf node.
====================

Link: https://lore.kernel.org/r/20210119120815.463334-1-maximmi@mellanox.comSigned-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      35187642
    • Maxim Mikityanskiy's avatar
      net/mlx5e: Support HTB offload · 214baf22
      Maxim Mikityanskiy authored 
      This commit adds support for HTB offload in the mlx5e driver.

Performance:

  NIC: Mellanox ConnectX-6 Dx
  CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (24 cores with HT)

  100 Gbit/s line rate, 500 UDP streams @ ~200 Mbit/s each
  48 traffic classes, flower used for steering
  No shaping (rate limits set to 4 Gbit/s per TC) - checking for max
  throughput.

  Baseline: 98.7 Gbps, 8.25 Mpps
  HTB: 6.7 Gbps, 0.56 Mpps
  HTB offload: 95.6 Gbps, 8.00 Mpps

Limitations:

1. 256 leaf nodes, 3 levels of depth.

2. Granularity for ceil is 1 Mbit/s. Rates are converted to weights, and
the bandwidth is split among the siblings according to these weights.
Other parameters for classes are not supported.

Ethtool statistics support for QoS SQs are also added. The counters are
called qos_txN_*, where N is the QoS queue number (starting from 0, the
numeration is separate from the normal SQs), and * is the counter name
(the counters are the same as for the normal SQs).
Signed-off-by: default avatarMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: default avatarTariq Toukan <tariqt@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      214baf22
    • Maxim Mikityanskiy's avatar
      sch_htb: Stats for offloaded HTB · 83271586
      Maxim Mikityanskiy authored 
      This commit adds support for statistics of offloaded HTB. Bytes and
packets counters for leaf and inner nodes are supported, the values are
taken from per-queue qdiscs, and the numbers that the user sees should
have the same behavior as the software (non-offloaded) HTB.
Signed-off-by: default avatarMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: default avatarTariq Toukan <tariqt@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      83271586
    • Maxim Mikityanskiy's avatar
      sch_htb: Hierarchical QoS hardware offload · d03b195b
      Maxim Mikityanskiy authored 
      HTB doesn't scale well because of contention on a single lock, and it
also consumes CPU. This patch adds support for offloading HTB to
hardware that supports hierarchical rate limiting.

In the offload mode, HTB passes control commands to the driver using
ndo_setup_tc. The driver has to replicate the whole hierarchy of classes
and their settings (rate, ceil) in the NIC. Every modification of the
HTB tree caused by the admin results in ndo_setup_tc being called.

After this setup, the HTB algorithm is done completely in the NIC. An SQ
(send queue) is created for every leaf class and attached to the
hierarchy, so that the NIC can calculate and obey aggregated rate
limits, too. In the future, it can be changed, so that multiple SQs will
back a single leaf class.

ndo_select_queue is responsible for selecting the right queue that
serves the traffic class of each packet.

The data path works as follows: a packet is classified by clsact, the
driver selects a hardware queue according to its class, and the packet
is enqueued into this queue's qdisc.

This solution addresses two main problems of scaling HTB:

1. Contention by flow classification. Currently the filters are attached
to the HTB instance as follows:

    # tc filter add dev eth0 parent 1:0 protocol ip flower dst_port 80
    classid 1:10

It's possible to move classification to clsact egress hook, which is
thread-safe and lock-free:

    # tc filter add dev eth0 egress protocol ip flower dst_port 80
    action skbedit priority 1:10

This way classification still happens in software, but the lock
contention is eliminated, and it happens before selecting the TX queue,
allowing the driver to translate the class to the corresponding hardware
queue in ndo_select_queue.

Note that this is already compatible with non-offloaded HTB and doesn't
require changes to the kernel nor iproute2.

2. Contention by handling packets. HTB is not multi-queue, it attaches
to a whole net device, and handling of all packets takes the same lock.
When HTB is offloaded, it registers itself as a multi-queue qdisc,
similarly to mq: HTB is attached to the netdev, and each queue has its
own qdisc.

Some features of HTB may be not supported by some particular hardware,
for example, the maximum number of classes may be limited, the
granularity of rate and ceil parameters may be different, etc. - so, the
offload is not enabled by default, a new parameter is used to enable it:

    # tc qdisc replace dev eth0 root handle 1: htb offload
Signed-off-by: default avatarMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: default avatarTariq Toukan <tariqt@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      d03b195b
    • Maxim Mikityanskiy's avatar
      net: sched: Add extack to Qdisc_class_ops.delete · 4dd78a73
      Maxim Mikityanskiy authored 
      In a following commit, sch_htb will start using extack in the delete
class operation to pass hardware errors in offload mode. This commit
prepares for that by adding the extack parameter to this callback and
converting usage of the existing qdiscs.
Signed-off-by: default avatarMaxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: default avatarTariq Toukan <tariqt@nvidia.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
      4dd78a73
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