[PATCH] e1000: Dump information on Tx ring

Dump information on Tx ring when 'NETDEV: Watchdog' condition is reached

Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@intel.com>
Signed-off-by: Ganesh Venkatesan <ganesh.venkatesan@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
diff -up net-drivers-2.6/drivers/net/e1000/e1000_main.c net-drivers-2.6/drivers/net/e1000.new/e1000_main.c

1 files changed, 30 insertions, 3 deletions

diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 4a8c069e6c7c..b5811f4f88f0 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2442,10 +2442,37 @@ e1000_clean_tx_irq(struct e1000_adapter *adapter)
                 /* detect a transmit hang in hardware, this serializes the
                  * check with the clearing of time_stamp and movement of i */
                 adapter->detect_tx_hung = FALSE;
-                if(tx_ring->buffer_info[i].dma &&
-                   time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ) &&
-                   !(E1000_READ_REG(&adapter->hw, STATUS) & E1000_STATUS_TXOFF))
+                if (tx_ring->buffer_info[i].dma &&
+                    time_after(jiffies, tx_ring->buffer_info[i].time_stamp + HZ)
+                    && !(E1000_READ_REG(&adapter->hw, STATUS) &
+                        E1000_STATUS_TXOFF)) {
+
+                        /* detected Tx unit hang */
+                        i = tx_ring->next_to_clean;
+                        eop = tx_ring->buffer_info[i].next_to_watch;
+                        eop_desc = E1000_TX_DESC(*tx_ring, eop);
+                        DPRINTK(TX_ERR, ERR, "Detected Tx Unit Hang\n"
+                                        "  TDH                  <%x>\n"
+                                        "  TDT                  <%x>\n"
+                                        "  next_to_use          <%x>\n"
+                                        "  next_to_clean        <%x>\n"
+                                        "buffer_info[next_to_clean]\n"
+                                        "  dma                  <%llx>\n"
+                                        "  time_stamp           <%lx>\n"
+                                        "  next_to_watch        <%x>\n"
+                                        "  jiffies              <%lx>\n"
+                                        "  next_to_watch.status <%x>\n",
+                                E1000_READ_REG(&adapter->hw, TDH),
+                                E1000_READ_REG(&adapter->hw, TDT),
+                                tx_ring->next_to_use,
+                                i,
+                                tx_ring->buffer_info[i].dma,
+                                tx_ring->buffer_info[i].time_stamp,
+                                eop,
+                                jiffies,
+                                eop_desc->upper.fields.status);
                         netif_stop_queue(netdev);
+                }
         }
 #ifdef NETIF_F_TSO