netdev - [PATCH 2/2] ibmveth: Automatically enable larger rx buffer pools for larger mtu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Wed, 16 May 2007 14:47:19 -0500
From:	Brian King <brking@...ux.vnet.ibm.com>
To:	santil@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org, brking@...ux.vnet.ibm.com
Subject: [PATCH 2/2] ibmveth: Automatically enable larger rx buffer pools for larger mtu


Currently, ibmveth maintains several rx buffer pools, which can
be modified through sysfs. By default, pools are not allocated by
default such that jumbo frames cannot be supported without first
activating larger rx buffer pools. This results in failures when attempting
to change the mtu. This patch makes ibmveth automatically allocate
these larger buffer pools when the mtu is changed.

Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
---

 linux-2.6-bjking1/drivers/net/ibmveth.c |   27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff -puN drivers/net/ibmveth.c~ibmveth_large_mtu drivers/net/ibmveth.c
--- linux-2.6/drivers/net/ibmveth.c~ibmveth_large_mtu	2007-05-16 10:47:54.000000000 -0500
+++ linux-2.6-bjking1/drivers/net/ibmveth.c	2007-05-16 10:47:54.000000000 -0500
@@ -915,17 +915,36 @@ static int ibmveth_change_mtu(struct net
 {
 	struct ibmveth_adapter *adapter = dev->priv;
 	int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
-	int i;
+	int reinit = 0;
+	int i, rc;
 
 	if (new_mtu < IBMVETH_MAX_MTU)
 		return -EINVAL;
 
+	for (i = 0; i < IbmVethNumBufferPools; i++)
+		if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
+			break;
+
+	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)
-			continue;
+		if (!adapter->rx_buff_pool[i].active) {
+			adapter->rx_buff_pool[i].active = 1;
+			reinit = 1;
+		}
+
 		if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
-			dev->mtu = new_mtu;
+			if (reinit && netif_running(adapter->netdev)) {
+				adapter->pool_config = 1;
+				ibmveth_close(adapter->netdev);
+				adapter->pool_config = 0;
+				dev->mtu = new_mtu;
+				if ((rc = ibmveth_open(adapter->netdev)))
+					return rc;
+			} else
+				dev->mtu = new_mtu;
 			return 0;
 		}
 	}
_
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html