ibmveth: Automatically enable larger rx buffer pools for larger mtu
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>
diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index 0052780..007ca87 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -1054,7 +1054,6 @@
{
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 @@
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 @@
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)