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sfc: check MTU against minimum threshold

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Reported-by: Ma Yuying <yuma@redhat.com>
Suggested-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Bert Kenward <bkenward@solarflare.com>
Reviewed-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bert Kenward 2016-09-06 17:50:00 +01:00 committed by David S. Miller
parent f1e4ba5b6a
commit 72a31d85a5
2 changed files with 14 additions and 1 deletions
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12
drivers/net/ethernet/sfc/efx.c
View File

@ -2263,8 +2263,18 @@ static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
rc = efx_check_disabled(efx);
if (rc)
return rc;
if (new_mtu > EFX_MAX_MTU)
if (new_mtu > EFX_MAX_MTU) {
netif_err(efx, drv, efx->net_dev,
"Requested MTU of %d too big (max: %d)\n",
new_mtu, EFX_MAX_MTU);
return -EINVAL;
}
if (new_mtu < EFX_MIN_MTU) {
netif_err(efx, drv, efx->net_dev,
"Requested MTU of %d too small (min: %d)\n",
new_mtu, EFX_MIN_MTU);
return -EINVAL;
}
netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);

3
drivers/net/ethernet/sfc/net_driver.h
View File

@ -76,6 +76,9 @@
/* Maximum possible MTU the driver supports */
#define EFX_MAX_MTU (9 * 1024)
/* Minimum MTU, from RFC791 (IP) */
#define EFX_MIN_MTU 68
/* Size of an RX scatter buffer. Small enough to pack 2 into a 4K page,
* and should be a multiple of the cache line size.
*/