iavf: Fix promiscuous mode configuration flow messages

Currently when configuring promiscuous mode on the AVF we detect a
change in the netdev->flags. We use IFF_PROMISC and IFF_ALLMULTI to
determine whether or not we need to request/release promiscuous mode
and/or multicast promiscuous mode. The problem is that the AQ calls for
setting/clearing promiscuous/multicast mode are treated separately. This
leads to a case where we can trigger two promiscuous mode AQ calls in
a row with the incorrect state. To fix this make a few changes.

Use IAVF_FLAG_AQ_CONFIGURE_PROMISC_MODE instead of the previous
IAVF_FLAG_AQ_[REQUEST|RELEASE]_[PROMISC|ALLMULTI] flags.

In iavf_set_rx_mode() detect if there is a change in the
netdev->flags in comparison with adapter->flags and set the
IAVF_FLAG_AQ_CONFIGURE_PROMISC_MODE aq_required bit. Then in
iavf_process_aq_command() only check for IAVF_FLAG_CONFIGURE_PROMISC_MODE
and call iavf_set_promiscuous() if it's set.

In iavf_set_promiscuous() check again to see which (if any) promiscuous
mode bits have changed when comparing the netdev->flags with the
adapter->flags. Use this to set the flags which get sent to the PF
driver.

Add a spinlock that is used for updating current_netdev_promisc_flags
and only allows one promiscuous mode AQ at a time.

[1] Fixes the fact that we will only have one AQ call in the aq_required
queue at any one time.

[2] Streamlines the change in promiscuous mode to only set one AQ
required bit.

[3] This allows us to keep track of the current state of the flags and
also makes it so we can take the most recent netdev->flags promiscuous
mode state.

[4] This fixes the problem where a change in the netdev->flags can cause
IAVF_FLAG_AQ_CONFIGURE_PROMISC_MODE to be set in iavf_set_rx_mode(),
but cleared in iavf_set_promiscuous() before the change is ever made via
AQ call.

Fixes: 47d3483988f6 ("i40evf: Add driver support for promiscuous mode")
Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Signed-off-by: Ahmed Zaki <ahmed.zaki@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/net/ethernet/intel/iavf/iavf.h b/drivers/net/ethernet/intel/iavf/iavf.h
index 85fba85fbb23..738e25657c6b 100644
--- a/drivers/net/ethernet/intel/iavf/iavf.h
+++ b/drivers/net/ethernet/intel/iavf/iavf.h
@@ -298,8 +298,6 @@ struct iavf_adapter {
 #define IAVF_FLAG_CLIENT_NEEDS_OPEN		BIT(10)
 #define IAVF_FLAG_CLIENT_NEEDS_CLOSE		BIT(11)
 #define IAVF_FLAG_CLIENT_NEEDS_L2_PARAMS	BIT(12)
-#define IAVF_FLAG_PROMISC_ON			BIT(13)
-#define IAVF_FLAG_ALLMULTI_ON			BIT(14)
 #define IAVF_FLAG_LEGACY_RX			BIT(15)
 #define IAVF_FLAG_REINIT_ITR_NEEDED		BIT(16)
 #define IAVF_FLAG_QUEUES_DISABLED		BIT(17)
@@ -325,10 +323,7 @@ struct iavf_adapter {
 #define IAVF_FLAG_AQ_SET_HENA			BIT_ULL(12)
 #define IAVF_FLAG_AQ_SET_RSS_KEY		BIT_ULL(13)
 #define IAVF_FLAG_AQ_SET_RSS_LUT		BIT_ULL(14)
-#define IAVF_FLAG_AQ_REQUEST_PROMISC		BIT_ULL(15)
-#define IAVF_FLAG_AQ_RELEASE_PROMISC		BIT_ULL(16)
-#define IAVF_FLAG_AQ_REQUEST_ALLMULTI		BIT_ULL(17)
-#define IAVF_FLAG_AQ_RELEASE_ALLMULTI		BIT_ULL(18)
+#define IAVF_FLAG_AQ_CONFIGURE_PROMISC_MODE	BIT_ULL(15)
 #define IAVF_FLAG_AQ_ENABLE_VLAN_STRIPPING	BIT_ULL(19)
 #define IAVF_FLAG_AQ_DISABLE_VLAN_STRIPPING	BIT_ULL(20)
 #define IAVF_FLAG_AQ_ENABLE_CHANNELS		BIT_ULL(21)
@@ -365,6 +360,12 @@ struct iavf_adapter {
 	(IAVF_EXTENDED_CAP_SEND_VLAN_V2 |		\
 	 IAVF_EXTENDED_CAP_RECV_VLAN_V2)
 
+	/* Lock to prevent possible clobbering of
+	 * current_netdev_promisc_flags
+	 */
+	spinlock_t current_netdev_promisc_flags_lock;
+	netdev_features_t current_netdev_promisc_flags;
+
 	/* OS defined structs */
 	struct net_device *netdev;
 	struct pci_dev *pdev;
@@ -551,7 +552,8 @@ void iavf_add_ether_addrs(struct iavf_adapter *adapter);
 void iavf_del_ether_addrs(struct iavf_adapter *adapter);
 void iavf_add_vlans(struct iavf_adapter *adapter);
 void iavf_del_vlans(struct iavf_adapter *adapter);
-void iavf_set_promiscuous(struct iavf_adapter *adapter, int flags);
+void iavf_set_promiscuous(struct iavf_adapter *adapter);
+bool iavf_promiscuous_mode_changed(struct iavf_adapter *adapter);
 void iavf_request_stats(struct iavf_adapter *adapter);
 int iavf_request_reset(struct iavf_adapter *adapter);
 void iavf_get_hena(struct iavf_adapter *adapter);