Subject: Re: [PATCH net] ice: fix setting RSS VSI hash for E830

From: Vadim Fedorenko <[email-masked]>
Date: Fri, 9 Jan 2026 16:44:55 +0000

On 09/01/2026 08:53, Marcin Szycik wrote:
> ice_set_rss_hfunc() performs a VSI update, in which it sets hashing
> function, leaving other VSI options unchanged. However, ::q_opt_flags is
> mistakenly set to the value of another field, instead of its original
> value, probably due to a typo. What happens next is hardware-dependent:
> 
> On E810, only the first bit is meaningful (see
> ICE_AQ_VSI_Q_OPT_PE_FLTR_EN) and can potentially end up in a different
> state than before VSI update.
> 
> On E830, some of the remaining bits are not reserved. Setting them
> to some unrelated values can cause the firmware to reject the update
> because of invalid settings, or worse - succeed.
> 
> Reproducer:
>    sudo ethtool -X $PF1 equal 8
> 
> Output in dmesg:
>    Failed to configure RSS hash for VSI 6, error -5
> 
> Fixes: 352e9bf23813 ("ice: enable symmetric-xor RSS for Toeplitz hash function")
> Reviewed-by: Aleksandr Loktionov <[email-masked]>
> Reviewed-by: Przemek Kitszel <[email-masked]>
> Signed-off-by: Marcin Szycik <[email-masked]>
> ---
>   drivers/net/ethernet/intel/ice/ice_main.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index cf8ba5a85384..08268f1a03da 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -8038,7 +8038,7 @@ int ice_set_rss_hfunc(struct ice_vsi *vsi, u8 hfunc)
>   	ctx->info.q_opt_rss |=
>   		FIELD_PREP(ICE_AQ_VSI_Q_OPT_RSS_HASH_M, hfunc);
>   	ctx->info.q_opt_tc = vsi->info.q_opt_tc;
> -	ctx->info.q_opt_flags = vsi->info.q_opt_rss;
> +	ctx->info.q_opt_flags = vsi->info.q_opt_flags;

The very same typo pattern is in ice_vc_handle_rss_cfg() in
ice/virt/rss.c

I believe both places have to be fixed.

>   
>   	err = ice_update_vsi(hw, vsi->idx, ctx, NULL);
>   	if (err) {