[PATCH net-next v2 2/9] net: use core MTU range checking in USB NIC drivers

From: Jarod Wilson
Date: Thu Oct 20 2016 - 13:58:30 EST

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Previous message: Jarod Wilson: "[PATCH net-next v2 3/9] net: use core MTU range checking in wireless drivers"
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usbnet:
- Remove stale new_mtu <= 0 check in usbnet.c
- Set min_mtu = 0, max_mtu = 65535 (sub-drivers must set their own
max_mtu and/or min_mtu as needed)

r8152:
- Set appropriate max_mtu for different variants (1500 or 9194)

lan78xx:
- Set max_mtu = 9000

asix_driver:
- max_mtu = 16384 for ax88178 variant

ax88179:
- max_mtu = 4088

cdc_ncm:
- max_mtu from hardware

cdc-phonet:
- min_mtu = 6, max_mtu = 65541

sierra_net:
- max_mtu = 1500, call usbnet_change_mtu directly
- sierra_net_change_mtu checked for MTU > 1500, then called
usbnet_change_mtu, but if we set max_mtu to let the network core handle
the range check, then we can simply call usbnet_change_mtu directly

smsc75xx:
- max_mtu = 9000

CC: netdev@xxxxxxxxxxxxxxx
CC: Woojung Huh <woojung.huh@xxxxxxxxxxxxx>
CC: Microchip Linux Driver Support <UNGLinuxDriver@xxxxxxxxxxxxx>
CC: Hayes Wang <hayeswang@xxxxxxxxxxx>
CC: Oliver Neukum <oneukum@xxxxxxxx>
CC: Steve Glendinning <steve.glendinning@xxxxxxxxxxx>
Signed-off-by: Jarod Wilson <jarod@xxxxxxxxxx>
---
drivers/net/usb/asix_devices.c | 4 +---
drivers/net/usb/ax88179_178a.c | 4 +---
drivers/net/usb/cdc-phonet.c | 12 ++----------
drivers/net/usb/cdc_ncm.c | 5 +----
drivers/net/usb/lan78xx.c | 8 +++-----
drivers/net/usb/r8152.c | 15 ++++++++++++---
drivers/net/usb/sierra_net.c | 13 ++-----------
drivers/net/usb/smsc75xx.c | 4 +---
drivers/net/usb/usbnet.c | 4 ++--
9 files changed, 25 insertions(+), 44 deletions(-)

diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index cce2495..7363cc5 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -1026,9 +1026,6 @@ static int ax88178_change_mtu(struct net_device *net, int new_mtu)

netdev_dbg(dev->net, "ax88178_change_mtu() new_mtu=%d\n", new_mtu);

- if (new_mtu <= 0 || ll_mtu > 16384)
- return -EINVAL;
-
if ((ll_mtu % dev->maxpacket) == 0)
return -EDOM;

@@ -1081,6 +1078,7 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)

dev->net->netdev_ops = &ax88178_netdev_ops;
dev->net->ethtool_ops = &ax88178_ethtool_ops;
+ dev->net->max_mtu = 16384 - (dev->net->hard_header_len + 4);

/* Blink LEDS so users know driver saw dongle */
asix_sw_reset(dev, 0, 0);
diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
index e6338c1..36c70d6 100644
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -907,9 +907,6 @@ static int ax88179_change_mtu(struct net_device *net, int new_mtu)
struct usbnet *dev = netdev_priv(net);
u16 tmp16;

- if (new_mtu <= 0 || new_mtu > 4088)
- return -EINVAL;
-
net->mtu = new_mtu;
dev->hard_mtu = net->mtu + net->hard_header_len;

@@ -1266,6 +1263,7 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
dev->net->netdev_ops = &ax88179_netdev_ops;
dev->net->ethtool_ops = &ax88179_ethtool_ops;
dev->net->needed_headroom = 8;
+ dev->net->max_mtu = 4088;

/* Initialize MII structure */
dev->mii.dev = dev->net;
diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index ff2270e..eb52de8 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -276,21 +276,11 @@ static int usbpn_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
return -ENOIOCTLCMD;
}

-static int usbpn_set_mtu(struct net_device *dev, int new_mtu)
-{
- if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
- return -EINVAL;
-
- dev->mtu = new_mtu;
- return 0;
-}
-
static const struct net_device_ops usbpn_ops = {
.ndo_open = usbpn_open,
.ndo_stop = usbpn_close,
.ndo_start_xmit = usbpn_xmit,
.ndo_do_ioctl = usbpn_ioctl,
- .ndo_change_mtu = usbpn_set_mtu,
};

static void usbpn_setup(struct net_device *dev)
@@ -301,6 +291,8 @@ static void usbpn_setup(struct net_device *dev)
dev->type = ARPHRD_PHONET;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
dev->mtu = PHONET_MAX_MTU;
+ dev->min_mtu = PHONET_MIN_MTU;
+ dev->max_mtu = PHONET_MAX_MTU;
dev->hard_header_len = 1;
dev->dev_addr[0] = PN_MEDIA_USB;
dev->addr_len = 1;
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 877c951..7141817 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -740,10 +740,6 @@ static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
- int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
-
- if (new_mtu <= 0 || new_mtu > maxmtu)
- return -EINVAL;

net->mtu = new_mtu;
cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
@@ -909,6 +905,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_

/* must handle MTU changes */
dev->net->netdev_ops = &cdc_ncm_netdev_ops;
+ dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);

return 0;

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 13f033c..c4e748e 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1980,11 +1980,6 @@ static int lan78xx_change_mtu(struct net_device *netdev, int new_mtu)
int old_rx_urb_size = dev->rx_urb_size;
int ret;

- if (new_mtu > MAX_SINGLE_PACKET_SIZE)
- return -EINVAL;
-
- if (new_mtu <= 0)
- return -EINVAL;
/* no second zero-length packet read wanted after mtu-sized packets */
if ((ll_mtu % dev->maxpacket) == 0)
return -EDOM;
@@ -3388,6 +3383,9 @@ static int lan78xx_probe(struct usb_interface *intf,
if (netdev->mtu > (dev->hard_mtu - netdev->hard_header_len))
netdev->mtu = dev->hard_mtu - netdev->hard_header_len;

+ /* MTU range: 68 - 9000 */
+ netdev->max_mtu = MAX_SINGLE_PACKET_SIZE;
+
dev->ep_blkin = (intf->cur_altsetting)->endpoint + 0;
dev->ep_blkout = (intf->cur_altsetting)->endpoint + 1;
dev->ep_intr = (intf->cur_altsetting)->endpoint + 2;
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 8d6e13c..4213c28 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -4119,9 +4119,6 @@ static int rtl8152_change_mtu(struct net_device *dev, int new_mtu)
break;
}

- if (new_mtu < 68 || new_mtu > RTL8153_MAX_MTU)
- return -EINVAL;
-
ret = usb_autopm_get_interface(tp->intf);
if (ret < 0)
return ret;
@@ -4311,6 +4308,18 @@ static int rtl8152_probe(struct usb_interface *intf,
netdev->ethtool_ops = &ops;
netif_set_gso_max_size(netdev, RTL_LIMITED_TSO_SIZE);

+ /* MTU range: 68 - 1500 or 9194 */
+ netdev->min_mtu = ETH_MIN_MTU;
+ switch (tp->version) {
+ case RTL_VER_01:
+ case RTL_VER_02:
+ netdev->max_mtu = ETH_DATA_LEN;
+ break;
+ default:
+ netdev->max_mtu = RTL8153_MAX_MTU;
+ break;
+ }
+
tp->mii.dev = netdev;
tp->mii.mdio_read = read_mii_word;
tp->mii.mdio_write = write_mii_word;
diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c
index a2515887..12071f1 100644
--- a/drivers/net/usb/sierra_net.c
+++ b/drivers/net/usb/sierra_net.c
@@ -165,7 +165,6 @@ struct lsi_umts {

/* Forward definitions */
static void sierra_sync_timer(unsigned long syncdata);
-static int sierra_net_change_mtu(struct net_device *net, int new_mtu);

/* Our own net device operations structure */
static const struct net_device_ops sierra_net_device_ops = {
@@ -173,7 +172,7 @@ static const struct net_device_ops sierra_net_device_ops = {
.ndo_stop = usbnet_stop,
.ndo_start_xmit = usbnet_start_xmit,
.ndo_tx_timeout = usbnet_tx_timeout,
- .ndo_change_mtu = sierra_net_change_mtu,
+ .ndo_change_mtu = usbnet_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
@@ -622,15 +621,6 @@ static const struct ethtool_ops sierra_net_ethtool_ops = {
.nway_reset = usbnet_nway_reset,
};

-/* MTU can not be more than 1500 bytes, enforce it. */
-static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
-{
- if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
- return -EINVAL;
-
- return usbnet_change_mtu(net, new_mtu);
-}
-
static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
{
int result = 0;
@@ -720,6 +710,7 @@ static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)

dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
+ dev->net->max_mtu = SIERRA_NET_MAX_SUPPORTED_MTU;

/* Set up the netdev */
dev->net->flags |= IFF_NOARP;
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index 9af9799..0b17b40 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -925,9 +925,6 @@ static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
struct usbnet *dev = netdev_priv(netdev);
int ret;

- if (new_mtu > MAX_SINGLE_PACKET_SIZE)
- return -EINVAL;
-
ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
if (ret < 0) {
netdev_warn(dev->net, "Failed to set mac rx frame length\n");
@@ -1448,6 +1445,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
dev->net->flags |= IFF_MULTICAST;
dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
+ dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
return 0;
}

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index d5071e3..3de65ea 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -384,8 +384,6 @@ int usbnet_change_mtu (struct net_device *net, int new_mtu)
int old_hard_mtu = dev->hard_mtu;
int old_rx_urb_size = dev->rx_urb_size;

- if (new_mtu <= 0)
- return -EINVAL;
// no second zero-length packet read wanted after mtu-sized packets
if ((ll_mtu % dev->maxpacket) == 0)
return -EDOM;
@@ -1669,6 +1667,8 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
* bind() should set rx_urb_size in that case.
*/
dev->hard_mtu = net->mtu + net->hard_header_len;
+ net->min_mtu = 0;
+ net->max_mtu = ETH_MAX_MTU;

net->netdev_ops = &usbnet_netdev_ops;
net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
--
2.10.0

Next message: Krzysztof Kozlowski: "Re: [PATCH v2 3/3] mtd: s3c2410: parse the device configuration from OF node"
Previous message: Jarod Wilson: "[PATCH net-next v2 3/9] net: use core MTU range checking in wireless drivers"
In reply to: David Miller: "Re: [PATCH net-next v2 3/9] net: use core MTU range checking in wireless drivers"
Next in thread: David Miller: "Re: [PATCH net-next v2 0/9] net: use core MTU range checking everywhere"
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