[Intel-wired-lan] [PATCH net v1] iavf: Fix error when changing ring parameters on ice PF

[Michal Maloszewski <michal.maloszewski@intel.com>]

Reset is triggered when ring parameters are being changed through
ethtool and queues are reconfigured for VF's VSI. If ring is changed
again immediately, then the next reset could be executed before
queues could be properly reinitialized on VF's VSI. It caused ice PF
to mess up the VSI resource tree.

Add a check in iavf_set_ringparam for adapter and VF's queue
state. If VF is currently resetting or queues are disabled for the VF
return with EAGAIN error.

Fixes: d732a1844507 ("i40evf: fix crash when changing ring sizes")
Signed-off-by: Sylwester Dziedziuch <sylwesterx.dziedziuch@intel.com>
Signed-off-by: Michal Maloszewski <michal.maloszewski@intel.com>
---
 drivers/net/ethernet/intel/iavf/iavf_ethtool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index 3bb56714beb0..8213bf3f8dfc 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -631,6 +631,11 @@ static int iavf_set_ringparam(struct net_device *netdev,
 	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
 		return -EINVAL;
 
+	if ((adapter->state == __IAVF_RESETTING) ||
+	    ((adapter->state == __IAVF_RUNNING) &&
+	     (adapter->flags & IAVF_FLAG_QUEUES_DISABLED)))
+		return -EAGAIN;
+
 	if (ring->tx_pending > IAVF_MAX_TXD ||
 	    ring->tx_pending < IAVF_MIN_TXD ||
 	    ring->rx_pending > IAVF_MAX_RXD ||
-- 
2.27.0