igb: Add workaround for byte swapped VLAN on i350 local traffic

On i350 when traffic is looped back from a VF to the PF the value is byte
swapped from the normal format.  In order to address this we need to add a
flag indicating that the ring will need to byte swap the loopback packets
prior to processing them.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by:  Aaron Brown  <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/igb/e1000_defines.h b/drivers/net/ethernet/intel/igb/e1000_defines.h
index 68558be..f5fc572 100644 (file)
--- a/drivers/net/ethernet/intel/igb/e1000_defines.h
+++ b/drivers/net/ethernet/intel/igb/e1000_defines.h
@@ -85,6 +85,7 @@
 #define E1000_RXD_STAT_TCPCS    0x20    /* TCP xsum calculated */
 #define E1000_RXD_STAT_TS       0x10000 /* Pkt was time stamped */
 
+#define E1000_RXDEXT_STATERR_LB    0x00040000
 #define E1000_RXDEXT_STATERR_CE    0x01000000
 #define E1000_RXDEXT_STATERR_SE    0x02000000
 #define E1000_RXDEXT_STATERR_SEQ   0x04000000

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 4e665a9..4c500a7 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -245,6 +245,7 @@ struct igb_ring {
 
 enum e1000_ring_flags_t {
        IGB_RING_FLAG_RX_SCTP_CSUM,
+       IGB_RING_FLAG_RX_LB_VLAN_BSWAP,
        IGB_RING_FLAG_TX_CTX_IDX,
        IGB_RING_FLAG_TX_DETECT_HANG
 };

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 9e79306..582432f 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -735,6 +735,11 @@ static int igb_alloc_queues(struct igb_adapter *adapter)
                /* set flag indicating ring supports SCTP checksum offload */
                if (adapter->hw.mac.type >= e1000_82576)
                        set_bit(IGB_RING_FLAG_RX_SCTP_CSUM, &ring->flags);
+
+               /* On i350, loopback VLAN packets have the tag byte-swapped. */
+               if (adapter->hw.mac.type == e1000_i350)
+                       set_bit(IGB_RING_FLAG_RX_LB_VLAN_BSWAP, &ring->flags);
+
                adapter->rx_ring[i] = ring;
        }
        /* Restore the adapter's original node */
@@ -5864,6 +5869,23 @@ static void igb_rx_hwtstamp(struct igb_q_vector *q_vector,
 
        igb_systim_to_hwtstamp(adapter, skb_hwtstamps(skb), regval);
 }
+
+static void igb_rx_vlan(struct igb_ring *ring,
+                       union e1000_adv_rx_desc *rx_desc,
+                       struct sk_buff *skb)
+{
+       if (igb_test_staterr(rx_desc, E1000_RXD_STAT_VP)) {
+               u16 vid;
+               if (igb_test_staterr(rx_desc, E1000_RXDEXT_STATERR_LB) &&
+                   test_bit(IGB_RING_FLAG_RX_LB_VLAN_BSWAP, &ring->flags))
+                       vid = be16_to_cpu(rx_desc->wb.upper.vlan);
+               else
+                       vid = le16_to_cpu(rx_desc->wb.upper.vlan);
+
+               __vlan_hwaccel_put_tag(skb, vid);
+       }
+}
+
 static inline u16 igb_get_hlen(union e1000_adv_rx_desc *rx_desc)
 {
        /* HW will not DMA in data larger than the given buffer, even if it
@@ -5960,12 +5982,7 @@ static bool igb_clean_rx_irq(struct igb_q_vector *q_vector, int budget)
                igb_rx_hwtstamp(q_vector, rx_desc, skb);
                igb_rx_hash(rx_ring, rx_desc, skb);
                igb_rx_checksum(rx_ring, rx_desc, skb);
-
-               if (igb_test_staterr(rx_desc, E1000_RXD_STAT_VP)) {
-                       u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
-
-                       __vlan_hwaccel_put_tag(skb, vid);
-               }
+               igb_rx_vlan(rx_ring, rx_desc, skb);
 
                total_bytes += skb->len;
                total_packets++;