nfp: add support for per-PCI PF mailbox
When working with devlink-related functionality for locking reasons it's easier to create a new mailbox per-PCI PF device than try to use one of the netdev/vNIC mailboxes. Define new mailbox structure and resolve its symbol during probe. For forward compatibility allow silent truncation of mailbox command data. Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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