35266255d6
The Spectrum ASIC has a dedicated table where nexthops (i.e., adjacency
entries) are populated. The size of this table can be controlled via
devlink-resource.
Add such a resource to netdevsim so that its occupancy will reflect the
number of nexthop objects currently programmed to the device.
By limiting the size of the resource, error paths could be exercised and
tested.
Example output:
# devlink resource show netdevsim/netdevsim10
netdevsim/netdevsim10:
name IPv4 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
resources:
name fib size unlimited occ 4 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name fib-rules size unlimited occ 3 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name IPv6 size unlimited unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
resources:
name fib size unlimited occ 1 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name fib-rules size unlimited occ 2 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
name nexthops size unlimited occ 0 unit entry size_min 0 size_max unlimited size_gran 1 dpipe_tables none
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.. SPDX-License-Identifier: GPL-2.0
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=========================
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netdevsim devlink support
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=========================
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This document describes the ``devlink`` features supported by the
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``netdevsim`` device driver.
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Parameters
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==========
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.. list-table:: Generic parameters implemented
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* - Name
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- Mode
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* - ``max_macs``
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- driverinit
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The ``netdevsim`` driver also implements the following driver-specific
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parameters.
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.. list-table:: Driver-specific parameters implemented
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:widths: 5 5 5 85
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* - Name
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- Type
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- Mode
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- Description
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* - ``test1``
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- Boolean
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- driverinit
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- Test parameter used to show how a driver-specific devlink parameter
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can be implemented.
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The ``netdevsim`` driver supports reloading via ``DEVLINK_CMD_RELOAD``
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Regions
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=======
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The ``netdevsim`` driver exposes a ``dummy`` region as an example of how the
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devlink-region interfaces work. A snapshot is taken whenever the
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``take_snapshot`` debugfs file is written to.
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Resources
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=========
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The ``netdevsim`` driver exposes resources to control the number of FIB
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entries, FIB rule entries and nexthops that the driver will allow.
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.. code:: shell
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$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib size 96
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$ devlink resource set netdevsim/netdevsim0 path /IPv4/fib-rules size 16
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$ devlink resource set netdevsim/netdevsim0 path /IPv6/fib size 64
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$ devlink resource set netdevsim/netdevsim0 path /IPv6/fib-rules size 16
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$ devlink resource set netdevsim/netdevsim0 path /nexthops size 16
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$ devlink dev reload netdevsim/netdevsim0
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Driver-specific Traps
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=====================
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.. list-table:: List of Driver-specific Traps Registered by ``netdevsim``
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:widths: 5 5 90
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* - Name
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- Type
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- Description
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* - ``fid_miss``
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- ``exception``
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- When a packet enters the device it is classified to a filtering
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indentifier (FID) based on the ingress port and VLAN. This trap is used
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to trap packets for which a FID could not be found
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