net: dsa: mv88e6xxx: Add FID map cache

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Add a cached FID bitmap. This mitigates the need to walk all VTU entries
to find the next free FID.

When flushing the VTU (during init), zero the FID bitmap. Use and
manipulate this bitmap from now on, instead of reading HW for the FID
map.

The repeated VTU walks are costly and can take ~40 mins if ~4000 vlans
are added. Caching the FID map reduces this time to <2 mins.

Signed-off-by: Aryan Srivastava <aryan.srivastava@alliedtelesis.co.nz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241006212905.3142976-1-aryan.srivastava@alliedtelesis.co.nz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Aryan Srivastava 2024-10-07 10:29:05 +13:00 • committed by Jakub Kicinski

parent 42b2331081

commit ada5c3229b

4 changed files with 14 additions and 38 deletions

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35

drivers/net/dsa/mv88e6xxx/chip.c

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5

drivers/net/dsa/mv88e6xxx/chip.h

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9

drivers/net/dsa/mv88e6xxx/devlink.c

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3

drivers/net/dsa/mv88e6xxx/global1_vtu.c

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