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ieee1394: eth1394: allow MTU bigger than 1500

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RFC 2734 says: "IP-capable nodes may operate with an MTU size larger
than the default [1500 octets], but the means by which a larger MTU is
configured are beyond the scope of this document."

Allow users to set an MTU bigger than 1500.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2007-04-03 23:55:40 +02:00
parent f982e5ffcf
commit 17bab407d5
1 changed files with 19 additions and 15 deletions
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34
drivers/ieee1394/eth1394.c
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@ -136,9 +136,6 @@ static const int hdr_type_len[] = {
sizeof(struct eth1394_sf_hdr)
};
/* For now, this needs to be 1500, so that XP works with us */
#define ETH1394_DATA_LEN ETH_DATA_LEN
static const u16 eth1394_speedto_maxpayload[] = {
/* S100, S200, S400, S800, S1600, S3200 */
512, 1024, 2048, 4096, 4096, 4096
@ -262,17 +259,27 @@ static void ether1394_tx_timeout(struct net_device *dev)
ether1394_host_reset(host);
}
static inline int ether1394_max_mtu(struct hpsb_host* host)
{
return (1 << (host->csr.max_rec + 1))
- sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
}
static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
{
int max_rec =
((struct eth1394_priv *)netdev_priv(dev))->host->csr.max_rec;
int max_mtu;
if (new_mtu < 68 ||
new_mtu > ETH1394_DATA_LEN ||
new_mtu > (1 << (max_rec + 1)) - sizeof(union eth1394_hdr) -
ETHER1394_GASP_OVERHEAD)
if (new_mtu < 68)
return -EINVAL;
max_mtu = ether1394_max_mtu(
((struct eth1394_priv *)netdev_priv(dev))->host);
if (new_mtu > max_mtu) {
ETH1394_PRINT(KERN_INFO, dev->name,
"Local node constrains MTU to %d\n", max_mtu);
return -ERANGE;
}
dev->mtu = new_mtu;
return 0;
}
@ -476,13 +483,10 @@ static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
max_speed = host->speed[i];
priv->bc_sspd = max_speed;
/* We'll use our maximum payload as the default MTU */
if (set_mtu) {
int max_payload = 1 << (host->csr.max_rec + 1);
dev->mtu = min(ETH1394_DATA_LEN,
(int)(max_payload - sizeof(union eth1394_hdr) -
ETHER1394_GASP_OVERHEAD));
/* Use the RFC 2734 default 1500 octets or the maximum payload
* as initial MTU */
dev->mtu = min(1500, ether1394_max_mtu(host));
/* Set our hardware address while we're at it */
memcpy(dev->dev_addr, &guid, sizeof(u64));