[PATCH] e1000: MSI support for PCI-e adapters

MSI support for PCI-e adapters

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.h net-drivers-2.6/drivers/net/e1000.new/e1000.h

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/e1000/e1000.h b/drivers/net/e1000/e1000.h
index 148930d4e9bd..da055520daa0 100644
--- a/drivers/net/e1000/e1000.h
+++ b/drivers/net/e1000/e1000.h
@@ -257,5 +257,8 @@ struct e1000_adapter {
 
 
         int msg_enable;
+#ifdef CONFIG_PCI_MSI
+        boolean_t have_msi;
+#endif
 };
 #endif /* _E1000_H_ */
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 82549a6fcfb3..03e3ec74f3fb 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -312,6 +312,16 @@ e1000_up(struct e1000_adapter *adapter)
         e1000_configure_rx(adapter);
         e1000_alloc_rx_buffers(adapter);
 
+#ifdef CONFIG_PCI_MSI
+        if(adapter->hw.mac_type > e1000_82547_rev_2) {
+                adapter->have_msi = TRUE;
+                if((err = pci_enable_msi(adapter->pdev))) {
+                        DPRINTK(PROBE, ERR,
+                         "Unable to allocate MSI interrupt Error: %d\n", err);
+                        adapter->have_msi = FALSE;
+                }
+        }
+#endif
         if((err = request_irq(adapter->pdev->irq, &e1000_intr,
                               SA_SHIRQ | SA_SAMPLE_RANDOM,
                               netdev->name, netdev)))
@@ -333,6 +343,11 @@ e1000_down(struct e1000_adapter *adapter)
 
         e1000_irq_disable(adapter);
         free_irq(adapter->pdev->irq, netdev);
+#ifdef CONFIG_PCI_MSI
+        if(adapter->hw.mac_type > e1000_82547_rev_2 &&
+           adapter->have_msi == TRUE)
+                pci_disable_msi(adapter->pdev);
+#endif
         del_timer_sync(&adapter->tx_fifo_stall_timer);
         del_timer_sync(&adapter->watchdog_timer);
         del_timer_sync(&adapter->phy_info_timer);