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ibmveth: Automatically enable larger rx buffer pools for larger mtu

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Activates larger rx buffer pools when the MTU is changed to a larger
value.  This patch de-activates the large rx buffer pools when the MTU
changes to a smaller value.

Signed-off-by: Santiago Leon <santil@us.ibm.com>
Signed-off-by: Robert Jennings <rcj@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Santiago Leon 2008-07-24 04:34:23 +10:00 committed by Benjamin Herrenschmidt
parent 22e1a4dd3f
commit ea866e6526
1 changed files with 14 additions and 8 deletions
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22
drivers/net/ibmveth.c
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@ -1054,7 +1054,6 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
{
struct ibmveth_adapter *adapter = dev->priv;
int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
int reinit = 0;
int i, rc;
if (new_mtu < IBMVETH_MAX_MTU)
@ -1067,15 +1066,21 @@ static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
if (i == IbmVethNumBufferPools)
return -EINVAL;
/* Look for an active buffer pool that can hold the new MTU */
for(i = 0; i<IbmVethNumBufferPools; i++) {
if (!adapter->rx_buff_pool[i].active) {
adapter->rx_buff_pool[i].active = 1;
reinit = 1;
/* Deactivate all the buffer pools so that the next loop can activate
only the buffer pools necessary to hold the new MTU */
for (i = 0; i < IbmVethNumBufferPools; i++)
if (adapter->rx_buff_pool[i].active) {
ibmveth_free_buffer_pool(adapter,
&adapter->rx_buff_pool[i]);
adapter->rx_buff_pool[i].active = 0;
}
/* Look for an active buffer pool that can hold the new MTU */
for(i = 0; i<IbmVethNumBufferPools; i++) {
adapter->rx_buff_pool[i].active = 1;
if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
if (reinit && netif_running(adapter->netdev)) {
if (netif_running(adapter->netdev)) {
adapter->pool_config = 1;
ibmveth_close(adapter->netdev);
adapter->pool_config = 0;
@ -1402,14 +1407,15 @@ const char * buf, size_t count)
return -EPERM;
}
pool->active = 0;
if (netif_running(netdev)) {
adapter->pool_config = 1;
ibmveth_close(netdev);
pool->active = 0;
adapter->pool_config = 0;
if ((rc = ibmveth_open(netdev)))
return rc;
}
pool->active = 0;
}
} else if (attr == &veth_num_attr) {
if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)