Re: [PATCH net 3/3] ice: Fix PF with enabled XDP going no-carrier after reset

[Maciej Fijalkowski <maciej.fijalkowski@intel.com>]

On Mon, Dec 18, 2023 at 11:27:06AM -0800, Tony Nguyen wrote:
> From: Larysa Zaremba <larysa.zaremba@intel.com>
> 
> Commit 6624e780a577fc596788 ("ice: split ice_vsi_setup into smaller
> functions") has refactored a bunch of code involved in PFR. In this
> process, TC queue number adjustment for XDP was lost. Bring it back.
> 
> Lack of such adjustment causes interface to go into no-carrier after a
> reset, if XDP program is attached, with the following message:
> 
> ice 0000:b1:00.0: Failed to set LAN Tx queue context, error: -22
> ice 0000:b1:00.0 ens801f0np0: Failed to open VSI 0x0006 on switch 0x0001
> ice 0000:b1:00.0: enable VSI failed, err -22, VSI index 0, type ICE_VSI_PF
> ice 0000:b1:00.0: PF VSI rebuild failed: -22
> ice 0000:b1:00.0: Rebuild failed, unload and reload driver
> 
> Fixes: 6624e780a577 ("ice: split ice_vsi_setup into smaller functions")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> Reviewed-by: Simon Horman <horms@kernel.org>
> Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_lib.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
> index de7ba87af45d..1bad6e17f9be 100644
> --- a/drivers/net/ethernet/intel/ice/ice_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_lib.c
> @@ -2371,6 +2371,9 @@ static int ice_vsi_cfg_tc_lan(struct ice_pf *pf, struct ice_vsi *vsi)
>  		} else {
>  			max_txqs[i] = vsi->alloc_txq;
>  		}
> +
> +		if (vsi->type == ICE_VSI_PF)
> +			max_txqs[i] += vsi->num_xdp_txq;

Nit: typically we always preceded this with ice_is_xdp_ena_vsi() call.
However, in this case I suppose it doesn't matter much, as if XDP prog is
not present then this value will just be 0.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

>  	}
>  
>  	dev_dbg(dev, "vsi->tc_cfg.ena_tc = %d\n", vsi->tc_cfg.ena_tc);
> -- 
> 2.41.0
>