Joe Damato 492a044508 ice: Add support for persistent NAPI config ...

Use netif_napi_add_config to assign persistent per-NAPI config when
initializing NAPIs. This preserves NAPI config settings when queue
counts are adjusted.

Tested with an E810-2CQDA2 NIC.

Begin by setting the queue count to 4:

$ sudo ethtool -L eth4 combined 4

Check the queue settings:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump napi-get --json='{"ifindex": 4}'
[{'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8452,
  'ifindex': 4,
  'irq': 2782},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8451,
  'ifindex': 4,
  'irq': 2781},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8450,
  'ifindex': 4,
  'irq': 2780},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8449,
  'ifindex': 4,
  'irq': 2779}]

Now, set the queue with NAPI ID 8451 to have a gro-flush-timeout of
1111:

$ sudo ./tools/net/ynl/cli.py \
            --spec Documentation/netlink/specs/netdev.yaml \
            --do napi-set --json='{"id": 8451, "gro-flush-timeout": 1111}'
None

Check that worked:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump napi-get --json='{"ifindex": 4}'
[{'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8452,
  'ifindex': 4,
  'irq': 2782},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 1111,
  'id': 8451,
  'ifindex': 4,
  'irq': 2781},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8450,
  'ifindex': 4,
  'irq': 2780},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8449,
  'ifindex': 4,
  'irq': 2779}]

Now reduce the queue count to 2, which would destroy the queue with NAPI
ID 8451:

$ sudo ethtool -L eth4 combined 2

Check the queue settings, noting that NAPI ID 8451 is gone:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump napi-get --json='{"ifindex": 4}'
[{'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8450,
  'ifindex': 4,
  'irq': 2780},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8449,
  'ifindex': 4,
  'irq': 2779}]

Now, increase the number of queues back to 4:

$ sudo ethtool -L eth4 combined 4

Dump the settings, expecting to see the same NAPI IDs as above and for
NAPI ID 8451 to have its gro-flush-timeout set to 1111:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump napi-get --json='{"ifindex": 4}'
[{'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8452,
  'ifindex': 4,
  'irq': 2782},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 1111,
  'id': 8451,
  'ifindex': 4,
  'irq': 2781},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8450,
  'ifindex': 4,
  'irq': 2780},
 {'defer-hard-irqs': 0,
  'gro-flush-timeout': 0,
  'id': 8449,
  'ifindex': 4,
  'irq': 2779}]

Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

2024-11-13 10:30:20 -08:00

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