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Add fundamental firmware (FW) communication operations via PF-FW mailbox, including: - FW sync (via HW info query with retries) - HW reset (post FW command to reset hardware) - MAC address retrieval (request FW for port-specific MAC) - Power management (powerup/powerdown notification to FW) Signed-off-by: Dong Yibo <dong100@mucse.com> Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev> Link: https://patch.msgid.link/20251101013849.120565-5-dong100@mucse.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>