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

[Marcin Szycik <marcin.szycik@linux.intel.com>]

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 <aleksandr.loktionov@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Marcin Szycik <marcin.szycik@linux.intel.com>
---
 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;
 
 	err = ice_update_vsi(hw, vsi->idx, ctx, NULL);
 	if (err) {
-- 
2.49.0