i40e: better return values

As mentioned by Joe Perches, clean up return values in some functions
making sure to have consistent return types, not mixing types.

A couple of Joe's comments suggested returning void, but since
the functions in question are ndo defined, the return values are fixed.
So make a comment in the header that notes this is a function called by
net_device_ops.

v2: fix post increment bug in return

CC: Joe Perches <joe@perches.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 60c71527f57c6ab82da30db78eb90430e6262160..221aa4795017649ccdd57accb01520c4bccb42e8 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -1787,6 +1787,8 @@ int i40e_vsi_add_vlan(struct i40e_vsi *vsi, s16 vid)
  * i40e_vsi_kill_vlan - Remove vsi membership for given vlan
  * @vsi: the vsi being configured
  * @vid: vlan id to be removed (0 = untagged only , -1 = any)
+ *
+ * Return: 0 on success or negative otherwise
  **/
 int i40e_vsi_kill_vlan(struct i40e_vsi *vsi, s16 vid)
 {
@@ -1860,37 +1862,39 @@ int i40e_vsi_kill_vlan(struct i40e_vsi *vsi, s16 vid)
  * i40e_vlan_rx_add_vid - Add a vlan id filter to HW offload
  * @netdev: network interface to be adjusted
  * @vid: vlan id to be added
+ *
+ * net_device_ops implementation for adding vlan ids
  **/
 static int i40e_vlan_rx_add_vid(struct net_device *netdev,
                                __always_unused __be16 proto, u16 vid)
 {
        struct i40e_netdev_priv *np = netdev_priv(netdev);
        struct i40e_vsi *vsi = np->vsi;
-       int ret;
+       int ret = 0;
 
        if (vid > 4095)
-               return 0;
+               return -EINVAL;
+
+       netdev_info(netdev, "adding %pM vid=%d\n", netdev->dev_addr, vid);
 
-       netdev_info(vsi->netdev, "adding %pM vid=%d\n",
-                   netdev->dev_addr, vid);
        /* If the network stack called us with vid = 0, we should
         * indicate to i40e_vsi_add_vlan() that we want to receive
         * any traffic (i.e. with any vlan tag, or untagged)
         */
        ret = i40e_vsi_add_vlan(vsi, vid ? vid : I40E_VLAN_ANY);
 
-       if (!ret) {
-               if (vid < VLAN_N_VID)
-                       set_bit(vid, vsi->active_vlans);
-       }
+       if (!ret && (vid < VLAN_N_VID))
+               set_bit(vid, vsi->active_vlans);
 
-       return 0;
+       return ret;
 }
 
 /**
  * i40e_vlan_rx_kill_vid - Remove a vlan id filter from HW offload
  * @netdev: network interface to be adjusted
  * @vid: vlan id to be removed
+ *
+ * net_device_ops implementation for adding vlan ids
  **/
 static int i40e_vlan_rx_kill_vid(struct net_device *netdev,
                                 __always_unused __be16 proto, u16 vid)
@@ -1898,15 +1902,16 @@ static int i40e_vlan_rx_kill_vid(struct net_device *netdev,
        struct i40e_netdev_priv *np = netdev_priv(netdev);
        struct i40e_vsi *vsi = np->vsi;
 
-       netdev_info(vsi->netdev, "removing %pM vid=%d\n",
-                   netdev->dev_addr, vid);
+       netdev_info(netdev, "removing %pM vid=%d\n", netdev->dev_addr, vid);
+
        /* return code is ignored as there is nothing a user
         * can do about failure to remove and a log message was
-        * already printed from another function
+        * already printed from the other function
         */
        i40e_vsi_kill_vlan(vsi, vid);
 
        clear_bit(vid, vsi->active_vlans);
+
        return 0;
 }
 
@@ -3324,7 +3329,8 @@ static void i40e_pf_unquiesce_all_vsi(struct i40e_pf *pf)
  **/
 static u8 i40e_dcb_get_num_tc(struct i40e_dcbx_config *dcbcfg)
 {
-       int num_tc = 0, i;
+       u8 num_tc = 0;
+       int i;
 
        /* Scan the ETS Config Priority Table to find
         * traffic class enabled for a given priority
@@ -3339,9 +3345,7 @@ static u8 i40e_dcb_get_num_tc(struct i40e_dcbx_config *dcbcfg)
        /* Traffic class index starts from zero so
         * increment to return the actual count
         */
-       num_tc++;
-
-       return num_tc;
+       return num_tc + 1;
 }
 
 /**
@@ -3491,6 +3495,7 @@ static int i40e_vsi_get_bw_info(struct i40e_vsi *vsi)
                /* 3 bits out of 4 for each TC */
                vsi->bw_ets_max_quanta[i] = (u8)((tc_bw_max >> (i*4)) & 0x7);
        }
+
        return 0;
 }