]> err.no Git - linux-2.6/commitdiff
ixgb: allocate only buffersize needed
authorAuke Kok <auke-jan.h.kok@intel.com>
Fri, 26 May 2006 16:35:43 +0000 (09:35 -0700)
committerAuke Kok <juke-jan.h.kok@intel.com>
Fri, 26 May 2006 16:35:43 +0000 (09:35 -0700)
In order to help correct window size growth, use the MFS register
to limit the packet sizes received and allocate only the buffer
size necessary

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
index 0905a82..84a8064 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -574,9 +574,8 @@ ixgb_sw_init(struct ixgb_adapter *adapte
  hw->subsystem_vendor_id = pdev->subsystem_vendor;
  hw->subsystem_id = pdev->subsystem_device;

- adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
-
  hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+ adapter->rx_buffer_len = hw->max_frame_size;

  if((hw->device_id == IXGB_DEVICE_ID_82597EX)
     || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
@@ -820,21 +819,14 @@ ixgb_setup_rctl(struct ixgb_adapter *ada

  rctl |= IXGB_RCTL_SECRC;

- switch (adapter->rx_buffer_len) {
- case IXGB_RXBUFFER_2048:
- default:
+ if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
  rctl |= IXGB_RCTL_BSIZE_2048;
- break;
- case IXGB_RXBUFFER_4096:
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
  rctl |= IXGB_RCTL_BSIZE_4096;
- break;
- case IXGB_RXBUFFER_8192:
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
  rctl |= IXGB_RCTL_BSIZE_8192;
- break;
- case IXGB_RXBUFFER_16384:
+ else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
  rctl |= IXGB_RCTL_BSIZE_16384;
- break;
- }

  IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 }
@@ -1551,25 +1543,12 @@ ixgb_change_mtu(struct net_device *netde
  DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
  return -EINVAL;
  }
-
- if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
-    || (max_frame <= IXGB_RXBUFFER_2048)) {
- adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
-
- } else if(max_frame <= IXGB_RXBUFFER_4096) {
- adapter->rx_buffer_len = IXGB_RXBUFFER_4096;

- } else if(max_frame <= IXGB_RXBUFFER_8192) {
- adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
+ adapter->rx_buffer_len = max_frame;

- } else {
- adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
- }
-
  netdev->mtu = new_mtu;
-
- if(old_max_frame != max_frame && netif_running(netdev)) {

+ if ((old_max_frame != max_frame) && netif_running(netdev)) {
  ixgb_down(adapter, TRUE);
  ixgb_up(adapter);
  }

drivers/net/ixgb/ixgb_main.c

index 5561ab6e9d3622b0be619b968ca1d844da727f97..b8258509f9f986c9d99436a3ea3cb687b661f3cd 100644 (file)
@@ -576,9 +576,8 @@ ixgb_sw_init(struct ixgb_adapter *adapter)
        hw->subsystem_vendor_id = pdev->subsystem_vendor;
        hw->subsystem_id = pdev->subsystem_device;
 
-       adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
-
        hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
+       adapter->rx_buffer_len = hw->max_frame_size;
 
        if((hw->device_id == IXGB_DEVICE_ID_82597EX)
           || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
@@ -822,21 +821,14 @@ ixgb_setup_rctl(struct ixgb_adapter *adapter)
 
        rctl |= IXGB_RCTL_SECRC;
 
-       switch (adapter->rx_buffer_len) {
-       case IXGB_RXBUFFER_2048:
-       default:
+       if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
                rctl |= IXGB_RCTL_BSIZE_2048;
-               break;
-       case IXGB_RXBUFFER_4096:
+       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
                rctl |= IXGB_RCTL_BSIZE_4096;
-               break;
-       case IXGB_RXBUFFER_8192:
+       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
                rctl |= IXGB_RCTL_BSIZE_8192;
-               break;
-       case IXGB_RXBUFFER_16384:
+       else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
                rctl |= IXGB_RCTL_BSIZE_16384;
-               break;
-       }
 
        IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 }
@@ -1546,24 +1538,11 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu)
                return -EINVAL;
        }
 
-       if((max_frame <= IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
-          || (max_frame <= IXGB_RXBUFFER_2048)) {
-               adapter->rx_buffer_len = IXGB_RXBUFFER_2048;
-
-       } else if(max_frame <= IXGB_RXBUFFER_4096) {
-               adapter->rx_buffer_len = IXGB_RXBUFFER_4096;
-
-       } else if(max_frame <= IXGB_RXBUFFER_8192) {
-               adapter->rx_buffer_len = IXGB_RXBUFFER_8192;
-
-       } else {
-               adapter->rx_buffer_len = IXGB_RXBUFFER_16384;
-       }
+       adapter->rx_buffer_len = max_frame;
 
        netdev->mtu = new_mtu;
 
-       if(old_max_frame != max_frame && netif_running(netdev)) {
-
+       if ((old_max_frame != max_frame) && netif_running(netdev)) {
                ixgb_down(adapter, TRUE);
                ixgb_up(adapter);
        }