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sunvnet: allow admin to set sunvnet MTU

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This patch allows an admin to set the MTU on a sunvnet device to arbitrary
values between the minimum (68) and maximum (65535) IPv4 packet sizes.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens 2014-09-29 19:48:18 -04:00 committed by David S. Miller
parent 8e845f4cbb
commit 42db672dca
3 changed files with 10 additions and 5 deletions
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2
arch/sparc/kernel/ldc.c
View file

@ -2159,7 +2159,7 @@ int ldc_map_single(struct ldc_channel *lp,
state.pte_idx = (base - iommu->page_table);
state.nc = 0;
fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len);
BUG_ON(state.nc != 1);
BUG_ON(state.nc > ncookies);
return state.nc;
}

7
drivers/net/ethernet/sun/sunvnet.c
View file

@ -913,6 +913,9 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(!skb))
goto out_dropped;
if (skb->len > port->rmtu)
goto out_dropped;
spin_lock_irqsave(&port->vio.lock, flags);
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
@ -944,7 +947,7 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
skb = NULL;
err = ldc_map_single(port->vio.lp, start, nlen,
port->tx_bufs[txi].cookies, 2,
port->tx_bufs[txi].cookies, VNET_MAXCOOKIES,
(LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
if (err < 0) {
netdev_info(dev, "tx buffer map error %d\n", err);
@ -1182,7 +1185,7 @@ static void vnet_set_rx_mode(struct net_device *dev)
static int vnet_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu != ETH_DATA_LEN)
if (new_mtu < 68 || new_mtu > 65535)
return -EINVAL;
dev->mtu = new_mtu;

6
drivers/net/ethernet/sun/sunvnet.h
View file

@ -16,7 +16,7 @@
*/
#define VNET_CLEAN_TIMEOUT ((HZ/100)+1)
#define VNET_MAXPACKET 1518ULL /* ETH_FRAMELEN + VLAN_HDR */
#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN)
#define VNET_TX_RING_SIZE 512
#define VNET_TX_WAKEUP_THRESH(dr) ((dr)->pending / 4)
@ -26,10 +26,12 @@
*/
#define VNET_PACKET_SKIP 6
#define VNET_MAXCOOKIES (VNET_MAXPACKET/PAGE_SIZE + 1)
struct vnet_tx_entry {
struct sk_buff *skb;
unsigned int ncookies;
struct ldc_trans_cookie cookies[2];
struct ldc_trans_cookie cookies[VNET_MAXCOOKIES];
};
struct vnet;