igb: handle vlan types with checker enabled

The sparse build (C=2) finds some issues with how the driver
dealt with the (very difficult) hardware that in some generations
uses little-endian, and in others uses big endian, for the VLAN
field. The code as written picks __le16 as a type and for some
hardware revisions we override it to __be16 as done in this
patch. This impacted the VF driver as well so fix it there too.

Also change the vlan_tci assignment to override the sparse
warning without changing functionality.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index cf91e3624a8995367cf08bdd299f68b63d302cb2..3a96b61a72299c4c775184dec7a61c3f65703446 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2643,7 +2643,8 @@ static int igb_parse_cls_flower(struct igb_adapter *adapter,
                        }
 
                        input->filter.match_flags |= IGB_FILTER_FLAG_VLAN_TCI;
-                       input->filter.vlan_tci = match.key->vlan_priority;
+                       input->filter.vlan_tci =
+                               (__force __be16)match.key->vlan_priority;
                }
        }
 
@@ -8597,7 +8598,7 @@ static void igb_process_skb_fields(struct igb_ring *rx_ring,
 
                if (igb_test_staterr(rx_desc, E1000_RXDEXT_STATERR_LB) &&
                    test_bit(IGB_RING_FLAG_RX_LB_VLAN_BSWAP, &rx_ring->flags))
-                       vid = be16_to_cpu(rx_desc->wb.upper.vlan);
+                       vid = be16_to_cpu((__force __be16)rx_desc->wb.upper.vlan);
                else
                        vid = le16_to_cpu(rx_desc->wb.upper.vlan);
 

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c
index fb3fbcb1333103fb13349adf883b221d88e2e152..630c1155f1965cefd9999d7abb33f5b39dd3432b 100644 (file)
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -83,14 +83,14 @@ static int igbvf_desc_unused(struct igbvf_ring *ring)
 static void igbvf_receive_skb(struct igbvf_adapter *adapter,
                              struct net_device *netdev,
                              struct sk_buff *skb,
-                             u32 status, u16 vlan)
+                             u32 status, __le16 vlan)
 {
        u16 vid;
 
        if (status & E1000_RXD_STAT_VP) {
                if ((adapter->flags & IGBVF_FLAG_RX_LB_VLAN_BSWAP) &&
                    (status & E1000_RXDEXT_STATERR_LB))
-                       vid = be16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
+                       vid = be16_to_cpu((__force __be16)vlan) & E1000_RXD_SPC_VLAN_MASK;
                else
                        vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
                if (test_bit(vid, adapter->active_vlans))