Patch "iavf: Fix TC config comparison with existing adapter TC config" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    iavf: Fix TC config comparison with existing adapter TC config

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     iavf-fix-tc-config-comparison-with-existing-adapter-.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 733a364a03250d3df17544e4e8b94e255a246ec4
Author: Sudheer Mogilappagari <sudheer.mogilappagari@xxxxxxxxx>
Date:   Tue Apr 23 11:27:19 2024 -0700

    iavf: Fix TC config comparison with existing adapter TC config
    
    [ Upstream commit 54976cf58d6168b8d15cebb395069f23b2f34b31 ]
    
    Same number of TCs doesn't imply that underlying TC configs are
    same. The config could be different due to difference in number
    of queues in each TC. Add utility function to determine if TC
    configs are same.
    
    Fixes: d5b33d024496 ("i40evf: add ndo_setup_tc callback to i40evf")
    Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@xxxxxxxxx>
    Tested-by: Mineri Bhange <minerix.bhange@xxxxxxxxx> (A Contingent Worker at Intel)
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20240423182723.740401-4-anthony.l.nguyen@xxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 41b8ff0d4df5e..6073dcc414d6d 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -2901,6 +2901,34 @@ static void iavf_del_all_cloud_filters(struct iavf_adapter *adapter)
 	spin_unlock_bh(&adapter->cloud_filter_list_lock);
 }
 
+/**
+ * iavf_is_tc_config_same - Compare the mqprio TC config with the
+ * TC config already configured on this adapter.
+ * @adapter: board private structure
+ * @mqprio_qopt: TC config received from kernel.
+ *
+ * This function compares the TC config received from the kernel
+ * with the config already configured on the adapter.
+ *
+ * Return: True if configuration is same, false otherwise.
+ **/
+static bool iavf_is_tc_config_same(struct iavf_adapter *adapter,
+				   struct tc_mqprio_qopt *mqprio_qopt)
+{
+	struct virtchnl_channel_info *ch = &adapter->ch_config.ch_info[0];
+	int i;
+
+	if (adapter->num_tc != mqprio_qopt->num_tc)
+		return false;
+
+	for (i = 0; i < adapter->num_tc; i++) {
+		if (ch[i].count != mqprio_qopt->count[i] ||
+		    ch[i].offset != mqprio_qopt->offset[i])
+			return false;
+	}
+	return true;
+}
+
 /**
  * __iavf_setup_tc - configure multiple traffic classes
  * @netdev: network interface device structure
@@ -2958,7 +2986,7 @@ static int __iavf_setup_tc(struct net_device *netdev, void *type_data)
 		if (ret)
 			return ret;
 		/* Return if same TC config is requested */
-		if (adapter->num_tc == num_tc)
+		if (iavf_is_tc_config_same(adapter, &mqprio_qopt->qopt))
 			return 0;
 		adapter->num_tc = num_tc;