1 files changed, 24 insertions, 40 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index e0ae248b4313..438a931fd55d 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -711,6 +711,7 @@ e1000_probe(struct pci_dev *pdev,
                 break;
         case e1000_82546:
         case e1000_82546_rev_3:
+        case e1000_82571:
                 if((E1000_READ_REG(&adapter->hw, STATUS) & E1000_STATUS_FUNC_1)
                    && (adapter->hw.media_type == e1000_media_type_copper)) {
                         e1000_read_eeprom(&adapter->hw,
@@ -1158,7 +1159,6 @@ e1000_setup_tx_resources(struct e1000_adapter *adapter,
                 return -ENOMEM;
         }
         memset(txdr->buffer_info, 0, size);
-        memset(&txdr->previous_buffer_info, 0, sizeof(struct e1000_buffer));
 
         /* round up to nearest 4K */
 
@@ -1813,11 +1813,6 @@ e1000_clean_tx_ring(struct e1000_adapter *adapter,
 
         /* Free all the Tx ring sk_buffs */
 
-        if (likely(tx_ring->previous_buffer_info.skb != NULL)) {
-                e1000_unmap_and_free_tx_resource(adapter,
-                                &tx_ring->previous_buffer_info);
-        }
-
         for(i = 0; i < tx_ring->count; i++) {
                 buffer_info = &tx_ring->buffer_info[i];
                 e1000_unmap_and_free_tx_resource(adapter, buffer_info);
@@ -1832,6 +1827,7 @@ e1000_clean_tx_ring(struct e1000_adapter *adapter,
 
         tx_ring->next_to_use = 0;
         tx_ring->next_to_clean = 0;
+        tx_ring->last_tx_tso = 0;
 
         writel(0, adapter->hw.hw_addr + tx_ring->tdh);
         writel(0, adapter->hw.hw_addr + tx_ring->tdt);
@@ -2437,6 +2433,16 @@ e1000_tx_map(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
                 buffer_info = &tx_ring->buffer_info[i];
                 size = min(len, max_per_txd);
 #ifdef NETIF_F_TSO
+                /* Workaround for Controller erratum --
+                 * descriptor for non-tso packet in a linear SKB that follows a
+                 * tso gets written back prematurely before the data is fully
+                 * DMAd to the controller */
+                if (!skb->data_len && tx_ring->last_tx_tso &&
+                                !skb_shinfo(skb)->tso_size) {
+                        tx_ring->last_tx_tso = 0;
+                        size -= 4;
+                }
+
                 /* Workaround for premature desc write-backs
                  * in TSO mode.  Append 4-byte sentinel desc */
                 if(unlikely(mss && !nr_frags && size == len && size > 8))
@@ -2693,6 +2699,14 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
         if(skb->ip_summed == CHECKSUM_HW)
                 count++;
 #endif
+
+#ifdef NETIF_F_TSO
+        /* Controller Erratum workaround */
+        if (!skb->data_len && tx_ring->last_tx_tso &&
+                !skb_shinfo(skb)->tso_size)
+                count++;
+#endif
+
         count += TXD_USE_COUNT(len, max_txd_pwr);
 
         if(adapter->pcix_82544)
@@ -2774,9 +2788,10 @@ e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
                 return NETDEV_TX_OK;
         }
 
-        if (likely(tso))
+        if (likely(tso)) {
+                tx_ring->last_tx_tso = 1;
                 tx_flags |= E1000_TX_FLAGS_TSO;
-        else if (likely(e1000_tx_csum(adapter, tx_ring, skb)))
+        } else if (likely(e1000_tx_csum(adapter, tx_ring, skb)))
                 tx_flags |= E1000_TX_FLAGS_CSUM;
 
         /* Old method was to assume IPv4 packet by default if TSO was enabled.
@@ -3227,37 +3242,12 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
         eop_desc = E1000_TX_DESC(*tx_ring, eop);
 
         while (eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) {
-                /* Premature writeback of Tx descriptors clear (free buffers
-                 * and unmap pci_mapping) previous_buffer_info */
-                if (likely(tx_ring->previous_buffer_info.skb != NULL)) {
-                        e1000_unmap_and_free_tx_resource(adapter,
-                                        &tx_ring->previous_buffer_info);
-                }
-
                 for(cleaned = FALSE; !cleaned; ) {
                         tx_desc = E1000_TX_DESC(*tx_ring, i);
                         buffer_info = &tx_ring->buffer_info[i];
                         cleaned = (i == eop);
 
-#ifdef NETIF_F_TSO
-                        if (!(netdev->features & NETIF_F_TSO)) {
-#endif
-                                e1000_unmap_and_free_tx_resource(adapter,
-                                                                 buffer_info);
-#ifdef NETIF_F_TSO
-                        } else {
-                                if (cleaned) {
-                                        memcpy(&tx_ring->previous_buffer_info,
-                                               buffer_info,
-                                               sizeof(struct e1000_buffer));
-                                        memset(buffer_info, 0,
-                                               sizeof(struct e1000_buffer));
-                                } else {
-                                        e1000_unmap_and_free_tx_resource(
-                                            adapter, buffer_info);
-                                }
-                        }
-#endif
+                        e1000_unmap_and_free_tx_resource(adapter, buffer_info);
 
                         tx_desc->buffer_addr = 0;
                         tx_desc->lower.data = 0;
@@ -3318,12 +3308,6 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter,
                         netif_stop_queue(netdev);
                 }
         }
-#ifdef NETIF_F_TSO
-        if (unlikely(!(eop_desc->upper.data & cpu_to_le32(E1000_TXD_STAT_DD)) &&
-            time_after(jiffies, tx_ring->previous_buffer_info.time_stamp + HZ)))
-                e1000_unmap_and_free_tx_resource(
-                    adapter, &tx_ring->previous_buffer_info);
-#endif
         return cleaned;
 }