diff options
| author | Santiago Leon <santil@us.ibm.com> | 2008-07-24 04:34:23 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-25 15:44:44 +1000 |
| commit | ea866e6526b8a2ead92875732d41b26fdb470312 (patch) | |
| tree | b6645f5f136691defbe6a73941a05d0649811a37 /drivers/net/ibmveth.c | |
| parent | 22e1a4dd3f2a9009d1d8896a5e833b6094877008 (diff) | |
| download | talos-obmc-linux-ea866e6526b8a2ead92875732d41b26fdb470312.tar.gz talos-obmc-linux-ea866e6526b8a2ead92875732d41b26fdb470312.zip | |
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>
Diffstat (limited to 'drivers/net/ibmveth.c')
| -rw-r--r-- | drivers/net/ibmveth.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index 00527805e4f1..007ca8735a94 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -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; + /* 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++) { - if (!adapter->rx_buff_pool[i].active) { - adapter->rx_buff_pool[i].active = 1; - reinit = 1; - } + 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) |
