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authorPekka Enberg <penberg@cs.helsinki.fi>2008-06-23 14:36:56 +0300
committerJeff Garzik <jgarzik@redhat.com>2008-07-04 08:46:54 -0400
commit532f4aee934cf26f1905fae101ac9f0ba3087f21 (patch)
treee90f06c06dd86f6168961e09f21655a51d08ed25 /drivers/net/ipg.c
parentda02b23192e8c1dc6830fc38840ea1c5e416a43c (diff)
downloadlinux-532f4aee934cf26f1905fae101ac9f0ba3087f21.tar.bz2
ipg: run-time configurable jumbo frame support
Make jumbo frame support configurable via ifconfig mtu option as suggested by Stephen Hemminger. Cc: Stephen Hemminger <stephen.hemminger@vyatta.com> Tested-by: Andrew Savchenko <Bircoph@list.ru> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/ipg.c')
-rw-r--r--drivers/net/ipg.c42
1 files changed, 32 insertions, 10 deletions
diff --git a/drivers/net/ipg.c b/drivers/net/ipg.c
index 57395b9587dc..7373dafbb3f7 100644
--- a/drivers/net/ipg.c
+++ b/drivers/net/ipg.c
@@ -42,7 +42,6 @@
#define ipg_r16(reg) ioread16(ioaddr + (reg))
#define ipg_r8(reg) ioread8(ioaddr + (reg))
-#define JUMBO_FRAME_4k_ONLY
enum {
netdev_io_size = 128
};
@@ -55,6 +54,14 @@ MODULE_DESCRIPTION("IC Plus IP1000 Gigabit Ethernet Adapter Linux Driver");
MODULE_LICENSE("GPL");
/*
+ * Defaults
+ */
+#define IPG_MAX_RXFRAME_SIZE 0x0600
+#define IPG_RXFRAG_SIZE 0x0600
+#define IPG_RXSUPPORT_SIZE 0x0600
+#define IPG_IS_JUMBO false
+
+/*
* Variable record -- index by leading revision/length
* Revision/Length(=N*4), Address1, Data1, Address2, Data2,...,AddressN,DataN
*/
@@ -1805,9 +1812,6 @@ static int ipg_nic_open(struct net_device *dev)
sp->jumbo.current_size = 0;
sp->jumbo.skb = NULL;
- if (IPG_TXFRAG_SIZE)
- dev->mtu = IPG_TXFRAG_SIZE;
-
/* Enable transmit and receive operation of the IPG. */
ipg_w32((ipg_r32(MAC_CTRL) | IPG_MC_RX_ENABLE | IPG_MC_TX_ENABLE) &
IPG_MC_RSVD_MASK, MAC_CTRL);
@@ -2116,6 +2120,7 @@ static int ipg_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
static int ipg_nic_change_mtu(struct net_device *dev, int new_mtu)
{
struct ipg_nic_private *sp = netdev_priv(dev);
+ int err;
/* Function to accomodate changes to Maximum Transfer Unit
* (or MTU) of IPG NIC. Cannot use default function since
@@ -2124,16 +2129,33 @@ static int ipg_nic_change_mtu(struct net_device *dev, int new_mtu)
IPG_DEBUG_MSG("_nic_change_mtu\n");
- /* Check that the new MTU value is between 68 (14 byte header, 46
- * byte payload, 4 byte FCS) and IPG_MAX_RXFRAME_SIZE, which
- * corresponds to the MAXFRAMESIZE register in the IPG.
+ /*
+ * Check that the new MTU value is between 68 (14 byte header, 46 byte
+ * payload, 4 byte FCS) and 10 KB, which is the largest supported MTU.
*/
- if ((new_mtu < 68) || (new_mtu > sp->max_rxframe_size))
+ if (new_mtu < 68 || new_mtu > 10240)
return -EINVAL;
+ err = ipg_nic_stop(dev);
+ if (err)
+ return err;
+
dev->mtu = new_mtu;
- return 0;
+ sp->max_rxframe_size = new_mtu;
+
+ sp->rxfrag_size = new_mtu;
+ if (sp->rxfrag_size > 4088)
+ sp->rxfrag_size = 4088;
+
+ sp->rxsupport_size = sp->max_rxframe_size;
+
+ if (new_mtu > 0x0600)
+ sp->is_jumbo = true;
+ else
+ sp->is_jumbo = false;
+
+ return ipg_nic_open(dev);
}
static int ipg_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
@@ -2238,7 +2260,7 @@ static int __devinit ipg_probe(struct pci_dev *pdev,
spin_lock_init(&sp->lock);
mutex_init(&sp->mii_mutex);
- sp->is_jumbo = IPG_JUMBO;
+ sp->is_jumbo = IPG_IS_JUMBO;
sp->rxfrag_size = IPG_RXFRAG_SIZE;
sp->rxsupport_size = IPG_RXSUPPORT_SIZE;
sp->max_rxframe_size = IPG_MAX_RXFRAME_SIZE;