github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-02 03:24:19 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ixgb: allocate only buffersize needed

Browse Source 
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);
 	}
This commit is contained in:
Auke Kok 2006-05-26 09:35:43 -07:00 committed by Auke Kok
parent 989316ddfe
commit 3f3dc0dd20
1 changed files with 7 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/net/ixgb/ixgb_main.c
View 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);
}