From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e31.co.us.ibm.com (e31.co.us.ibm.com [32.97.110.149]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "e31.co.us.ibm.com", Issuer "Equifax" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 7AE61DFC22 for ; Thu, 26 Jun 2008 06:19:23 +1000 (EST) Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e31.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id m5PKJGYc008096 for ; Wed, 25 Jun 2008 16:19:16 -0400 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v9.0) with ESMTP id m5PKJE93147492 for ; Wed, 25 Jun 2008 14:19:14 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m5PKJBVt024721 for ; Wed, 25 Jun 2008 14:19:14 -0600 Date: Wed, 25 Jun 2008 15:19:00 -0500 From: Robert Jennings To: paulus@samba.org Subject: [PATCH 15/18 v2] ibmveth: Automatically enable larger rx buffer pools for larger mtu Message-ID: <20080625201900.GQ17020@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20080625201202.GB17020@linux.vnet.ibm.com> Cc: netdev@vger.kernel.org, linuxppc-dev@ozlabs.org, David Darrington , Brian King List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , =46rom: Santiago Leon 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 Signed-off-by: Robert Jennings --- drivers/net/ibmveth.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) Index: b/drivers/net/ibmveth.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -1054,7 +1054,6 @@ static int ibmveth_change_mtu(struct net { struct ibmveth_adapter *adapter =3D dev->priv; int new_mtu_oh =3D new_mtu + IBMVETH_BUFF_OH; - int reinit =3D 0; int i, rc; =20 if (new_mtu < IBMVETH_MAX_MTU) @@ -1067,15 +1066,21 @@ static int ibmveth_change_mtu(struct net if (i =3D=3D IbmVethNumBufferPools) return -EINVAL; =20 + /* Deactivate all the buffer pools so that the next loop can activate + only the buffer pools necessary to hold the new MTU */ + for (i =3D 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 =3D 0; + } + /* Look for an active buffer pool that can hold the new MTU */ for(i =3D 0; irx_buff_pool[i].active) { - adapter->rx_buff_pool[i].active =3D 1; - reinit =3D 1; - } + adapter->rx_buff_pool[i].active =3D 1; =20 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 =3D 1; ibmveth_close(adapter->netdev); adapter->pool_config =3D 0; @@ -1402,14 +1407,15 @@ const char * buf, size_t count) return -EPERM; } =20 - pool->active =3D 0; if (netif_running(netdev)) { adapter->pool_config =3D 1; ibmveth_close(netdev); + pool->active =3D 0; adapter->pool_config =3D 0; if ((rc =3D ibmveth_open(netdev))) return rc; } + pool->active =3D 0; } } else if (attr =3D=3D &veth_num_attr) { if (value <=3D 0 || value > IBMVETH_MAX_POOL_COUNT)