Re: [PATCH net v1] ice: fix LLDP AQ filter fallback not working on E82x and E830 hardware

[Simon Horman <horms@kernel.org>]

On Fri, Mar 20, 2026 at 06:10:34AM +0100, Aleksandr Loktionov wrote:
> Commit 4d5a1c4e6d49 ("ice: do not add LLDP-specific filter if not
> necessary") restructured ice_vsi_cfg_sw_lldp() to first attempt a
> generic ethernet Rx filter and, on failure, fall back to the specialized
> LLDP filter control AQ command (0x0A0A) via ice_lldp_fltr_add_remove().
> This fallback is gated by ice_fw_supports_lldp_fltr_ctrl(), which only
> accepted E810, causing two distinct omissions.
> 
> E82x (ICE_MAC_GENERIC, e.g. E822/E823) support the same LLDP filter
> control AQ command with the same minimum firmware API version as E810
> (>= 1.7.1). On E82x systems where the generic ethernet LLDP Rx filter
> cannot be added, the AQ fallback silently returns -EOPNOTSUPP and the
> port is left with no LLDP Rx filter.
> 
> E830 has been supported since kernel 6.9 and implements the same AQ
> command but requires a higher minimum API version (>= 1.7.11). Starting
> with NVM 1.2 / FW 7.9.1, the generic ethernet LLDP Rx filter path is
> blocked on E830, making the AQ fallback the only viable option. With
> ice_fw_supports_lldp_fltr_ctrl() returning false for E830, no LLDP Rx
> filter is installed after a firmware-update-triggered reset (e.g. NVM
> 1.1->1.2 on an E830-CC in HPE DL380 Gen11), and the interface stays
> link-down with complete loss of network connectivity.
> 
> Replace the single-type if-chain with a switch on hw->mac_type so each
> family's version requirement is explicit. E810 and E82x share the 1.7.1
> constants; E830 gets its own 1.7.11 constants. The default branch returns
> false, covering any future MAC type that does not implement the command.
> 
> Fixes: 4d5a1c4e6d49 ("ice: do not add LLDP-specific filter if not necessary")
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

Reviewed-by: Simon Horman <horms@kernel.org>