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caif: Use link layer MTU instead of fixed MTU

Browse source 
Previously CAIF supported maximum transfer size of ~4050.
The transfer size is now calculated dynamically based on the
link layers mtu size.

Signed-off-by: Sjur Braendeland@stericsson.com
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sjur Braendeland 2010-06-17 06:55:40 +00:00 committed by David S. Miller
parent a7da1f55a8
commit 2aa40aef9d
15 changed files with 173 additions and 69 deletions
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1
drivers/net/caif/caif_serial.c
View file

@ -403,7 +403,6 @@ static void caifdev_setup(struct net_device *dev)
dev->type = ARPHRD_CAIF;
dev->flags = IFF_POINTOPOINT | IFF_NOARP;
dev->mtu = CAIF_MAX_MTU;
dev->hard_header_len = CAIF_NEEDED_HEADROOM;
dev->tx_queue_len = 0;
dev->destructor = free_netdev;
skb_queue_head_init(&serdev->head);

8
include/net/caif/caif_dev.h
View file

@ -50,6 +50,9 @@ struct caif_connect_request {
* @client_layer: User implementation of client layer. This layer
* MUST have receive and control callback functions
* implemented.
* @ifindex: Link layer interface index used for this connection.
* @headroom: Head room needed by CAIF protocol.
* @tailroom: Tail room needed by CAIF protocol.
*
* This function connects a CAIF channel. The Client must implement
* the struct cflayer. This layer represents the Client layer and holds
@ -59,8 +62,9 @@ struct caif_connect_request {
* E.g. CAIF Socket will call this function for each socket it connects
* and have one client_layer instance for each socket.
*/
int caif_connect_client(struct caif_connect_request *config,
struct cflayer *client_layer);
int caif_connect_client(struct caif_connect_request *conn_req,
struct cflayer *client_layer, int *ifindex,
int *headroom, int *tailroom);
/**
* caif_disconnect_client - Disconnects a client from the CAIF stack.

6
include/net/caif/caif_layer.h
View file

@ -15,14 +15,8 @@ struct cfpktq;
struct caif_payload_info;
struct caif_packet_funcs;
#define CAIF_MAX_FRAMESIZE 4096
#define CAIF_MAX_PAYLOAD_SIZE (4096 - 64)
#define CAIF_NEEDED_HEADROOM (10)
#define CAIF_NEEDED_TAILROOM (2)
#define CAIF_LAYER_NAME_SZ 16
#define CAIF_SUCCESS 1
#define CAIF_FAILURE 0
/**
* caif_assert() - Assert function for CAIF.

16
include/net/caif/cfcnfg.h
View file

@ -7,6 +7,7 @@
#ifndef CFCNFG_H_
#define CFCNFG_H_
#include <linux/spinlock.h>
#include <linux/netdevice.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfctrl.h>
@ -73,8 +74,8 @@ void cfcnfg_remove(struct cfcnfg *cfg);
void
cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
void *dev, struct cflayer *phy_layer, u16 *phyid,
enum cfcnfg_phy_preference pref,
struct net_device *dev, struct cflayer *phy_layer,
u16 *phyid, enum cfcnfg_phy_preference pref,
bool fcs, bool stx);
/**
@ -114,11 +115,18 @@ void cfcnfg_release_adap_layer(struct cflayer *adap_layer);
* @param: Link setup parameters.
* @adap_layer: Specify the adaptation layer; the receive and
* flow-control functions MUST be set in the structure.
*
* @ifindex: Link layer interface index used for this connection.
* @proto_head: Protocol head-space needed by CAIF protocol,
* excluding link layer.
* @proto_tail: Protocol tail-space needed by CAIF protocol,
* excluding link layer.
*/
int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
struct cfctrl_link_param *param,
struct cflayer *adap_layer);
struct cflayer *adap_layer,
int *ifindex,
int *proto_head,
int *proto_tail);
/**
* cfcnfg_get_phyid() - Get physical ID, given type.

12
net/caif/caif_dev.c
View file

@ -255,7 +255,7 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
pref = CFPHYPREF_HIGH_BW;
break;
}
dev_hold(dev);
cfcnfg_add_phy_layer(get_caif_conf(),
phy_type,
dev,
@ -285,6 +285,7 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
caifd->layer.up->ctrlcmd(caifd->layer.up,
_CAIF_CTRLCMD_PHYIF_DOWN_IND,
caifd->layer.id);
might_sleep();
res = wait_event_interruptible_timeout(caifd->event,
atomic_read(&caifd->in_use) == 0,
TIMEOUT);
@ -300,6 +301,7 @@ static int caif_device_notify(struct notifier_block *me, unsigned long what,
"Unregistering an active CAIF device: %s\n",
__func__, dev->name);
cfcnfg_del_phy_layer(get_caif_conf(), &caifd->layer);
dev_put(dev);
atomic_set(&caifd->state, what);
break;
@ -326,7 +328,8 @@ struct cfcnfg *get_caif_conf(void)
EXPORT_SYMBOL(get_caif_conf);
int caif_connect_client(struct caif_connect_request *conn_req,
struct cflayer *client_layer)
struct cflayer *client_layer, int *ifindex,
int *headroom, int *tailroom)
{
struct cfctrl_link_param param;
int ret;
@ -334,8 +337,9 @@ int caif_connect_client(struct caif_connect_request *conn_req,
if (ret)
return ret;
/* Hook up the adaptation layer. */
return cfcnfg_add_adaptation_layer(get_caif_conf(),
&param, client_layer);
return cfcnfg_add_adaptation_layer(get_caif_conf(), &param,
client_layer, ifindex,
headroom, tailroom);
}
EXPORT_SYMBOL(caif_connect_client);

54
net/caif/caif_socket.c
View file

@ -28,8 +28,8 @@
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(AF_CAIF);
#define CAIF_DEF_SNDBUF (CAIF_MAX_PAYLOAD_SIZE*10)
#define CAIF_DEF_RCVBUF (CAIF_MAX_PAYLOAD_SIZE*100)
#define CAIF_DEF_SNDBUF (4096*10)
#define CAIF_DEF_RCVBUF (4096*100)
/*
* CAIF state is re-using the TCP socket states.
@ -76,6 +76,7 @@ struct caifsock {
struct caif_connect_request conn_req;
struct mutex readlock;
struct dentry *debugfs_socket_dir;
int headroom, tailroom, maxframe;
};
static int rx_flow_is_on(struct caifsock *cf_sk)
@ -594,23 +595,32 @@ static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock,
goto err;
noblock = msg->msg_flags & MSG_DONTWAIT;
buffer_size = len + CAIF_NEEDED_HEADROOM + CAIF_NEEDED_TAILROOM;
timeo = sock_sndtimeo(sk, noblock);
timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
1, timeo, &ret);
if (ret)
goto err;
ret = -EPIPE;
if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
sock_flag(sk, SOCK_DEAD) ||
(sk->sk_shutdown & RCV_SHUTDOWN))
goto err;
/* Error if trying to write more than maximum frame size. */
ret = -EMSGSIZE;
if (len > cf_sk->maxframe && cf_sk->sk.sk_protocol != CAIFPROTO_RFM)
goto err;
buffer_size = len + cf_sk->headroom + cf_sk->tailroom;
ret = -ENOMEM;
skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
if (!skb)
if (!skb || skb_tailroom(skb) < buffer_size)
goto err;
skb_reserve(skb, CAIF_NEEDED_HEADROOM);
skb_reserve(skb, cf_sk->headroom);
ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
@ -641,7 +651,6 @@ static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
long timeo;
err = -EOPNOTSUPP;
if (unlikely(msg->msg_flags&MSG_OOB))
goto out_err;
@ -658,8 +667,8 @@ static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
size = len-sent;
if (size > CAIF_MAX_PAYLOAD_SIZE)
size = CAIF_MAX_PAYLOAD_SIZE;
if (size > cf_sk->maxframe)
size = cf_sk->maxframe;
/* If size is more than half of sndbuf, chop up message */
if (size > ((sk->sk_sndbuf >> 1) - 64))
@ -669,14 +678,14 @@ static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
size = SKB_MAX_ALLOC;
skb = sock_alloc_send_skb(sk,
size + CAIF_NEEDED_HEADROOM
+ CAIF_NEEDED_TAILROOM,
size + cf_sk->headroom +
cf_sk->tailroom,
msg->msg_flags&MSG_DONTWAIT,
&err);
if (skb == NULL)
goto out_err;
skb_reserve(skb, CAIF_NEEDED_HEADROOM);
skb_reserve(skb, cf_sk->headroom);
/*
* If you pass two values to the sock_alloc_send_skb
* it tries to grab the large buffer with GFP_NOFS
@ -817,17 +826,15 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
long timeo;
int err;
int ifindex, headroom, tailroom;
struct net_device *dev;
lock_sock(sk);
err = -EAFNOSUPPORT;
if (uaddr->sa_family != AF_CAIF)
goto out;
err = -ESOCKTNOSUPPORT;
if (unlikely(!(sk->sk_type == SOCK_STREAM &&
cf_sk->sk.sk_protocol == CAIFPROTO_AT) &&
sk->sk_type != SOCK_SEQPACKET))
goto out;
switch (sock->state) {
case SS_UNCONNECTED:
/* Normal case, a fresh connect */
@ -883,12 +890,23 @@ static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
dbfs_atomic_inc(&cnt.num_connect_req);
cf_sk->layer.receive = caif_sktrecv_cb;
err = caif_connect_client(&cf_sk->conn_req,
&cf_sk->layer);
&cf_sk->layer, &ifindex, &headroom, &tailroom);
if (err < 0) {
cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
cf_sk->sk.sk_state = CAIF_DISCONNECTED;
goto out;
}
dev = dev_get_by_index(sock_net(sk), ifindex);
cf_sk->headroom = LL_RESERVED_SPACE_EXTRA(dev, headroom);
cf_sk->tailroom = tailroom;
cf_sk->maxframe = dev->mtu - (headroom + tailroom);
dev_put(dev);
if (cf_sk->maxframe < 1) {
pr_warning("CAIF: %s(): CAIF Interface MTU too small (%d)\n",
__func__, dev->mtu);
err = -ENODEV;
goto out;
}
err = -EINPROGRESS;
wait_connect:

44
net/caif/cfcnfg.c
View file

@ -6,6 +6,7 @@
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfpkt.h>
#include <net/caif/cfcnfg.h>
@ -42,6 +43,15 @@ struct cfcnfg_phyinfo {
/* Information about the physical device */
struct dev_info dev_info;
/* Interface index */
int ifindex;
/* Use Start of frame extension */
bool use_stx;
/* Use Start of frame checksum */
bool use_fcs;
};
struct cfcnfg {
@ -249,9 +259,20 @@ static void cfcnfg_linkdestroy_rsp(struct cflayer *layer, u8 channel_id)
{
}
int protohead[CFCTRL_SRV_MASK] = {
[CFCTRL_SRV_VEI] = 4,
[CFCTRL_SRV_DATAGRAM] = 7,
[CFCTRL_SRV_UTIL] = 4,
[CFCTRL_SRV_RFM] = 3,
[CFCTRL_SRV_DBG] = 3,
};
int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
struct cfctrl_link_param *param,
struct cflayer *adap_layer)
struct cflayer *adap_layer,
int *ifindex,
int *proto_head,
int *proto_tail)
{
struct cflayer *frml;
if (adap_layer == NULL) {
@ -277,6 +298,14 @@ int cfcnfg_add_adaptation_layer(struct cfcnfg *cnfg,
param->phyid);
caif_assert(cnfg->phy_layers[param->phyid].phy_layer->id ==
param->phyid);
*ifindex = cnfg->phy_layers[param->phyid].ifindex;
*proto_head =
protohead[param->linktype]+
(cnfg->phy_layers[param->phyid].use_stx ? 1 : 0);
*proto_tail = 2;
/* FIXME: ENUMERATE INITIALLY WHEN ACTIVATING PHYSICAL INTERFACE */
cfctrl_enum_req(cnfg->ctrl, param->phyid);
return cfctrl_linkup_request(cnfg->ctrl, param, adap_layer);
@ -298,6 +327,8 @@ cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
struct cfcnfg *cnfg = container_obj(layer);
struct cflayer *servicel = NULL;
struct cfcnfg_phyinfo *phyinfo;
struct net_device *netdev;
if (adapt_layer == NULL) {
pr_debug("CAIF: %s(): link setup response "
"but no client exist, send linkdown back\n",
@ -329,8 +360,9 @@ cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
servicel = cfdgml_create(channel_id, &phyinfo->dev_info);
break;
case CFCTRL_SRV_RFM:
netdev = phyinfo->dev_info.dev;
servicel = cfrfml_create(channel_id, &phyinfo->dev_info,
RFM_FRAGMENT_SIZE);
netdev->mtu);
break;
case CFCTRL_SRV_UTIL:
servicel = cfutill_create(channel_id, &phyinfo->dev_info);
@ -361,8 +393,8 @@ cfcnfg_linkup_rsp(struct cflayer *layer, u8 channel_id, enum cfctrl_srv serv,
void
cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
void *dev, struct cflayer *phy_layer, u16 *phyid,
enum cfcnfg_phy_preference pref,
struct net_device *dev, struct cflayer *phy_layer,
u16 *phyid, enum cfcnfg_phy_preference pref,
bool fcs, bool stx)
{
struct cflayer *frml;
@ -416,6 +448,10 @@ cfcnfg_add_phy_layer(struct cfcnfg *cnfg, enum cfcnfg_phy_type phy_type,
cnfg->phy_layers[*phyid].dev_info.dev = dev;
cnfg->phy_layers[*phyid].phy_layer = phy_layer;
cnfg->phy_layers[*phyid].phy_ref_count = 0;
cnfg->phy_layers[*phyid].ifindex = dev->ifindex;
cnfg->phy_layers[*phyid].use_stx = stx;
cnfg->phy_layers[*phyid].use_fcs = fcs;
phy_layer->type = phy_type;
frml = cffrml_create(*phyid, fcs);
if (!frml) {

6
net/caif/cfctrl.c
View file

@ -19,7 +19,7 @@
#ifdef CAIF_NO_LOOP
static int handle_loop(struct cfctrl *ctrl,
int cmd, struct cfpkt *pkt){
return CAIF_FAILURE;
return -1;
}
#else
static int handle_loop(struct cfctrl *ctrl,
@ -395,7 +395,7 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
cmd = cmdrsp & CFCTRL_CMD_MASK;
if (cmd != CFCTRL_CMD_LINK_ERR
&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
if (handle_loop(cfctrl, cmd, pkt) != 0)
cmdrsp |= CFCTRL_ERR_BIT;
}
@ -647,6 +647,6 @@ static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
default:
break;
}
return CAIF_SUCCESS;
return 0;
}
#endif

5
net/caif/cfdgml.c
View file

@ -17,6 +17,7 @@
#define DGM_FLOW_OFF 0x81
#define DGM_FLOW_ON 0x80
#define DGM_CTRL_PKT_SIZE 1
#define DGM_MTU 1500
static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
@ -89,6 +90,10 @@ static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
if (!cfsrvl_ready(service, &ret))
return ret;
/* STE Modem cannot handle more than 1500 bytes datagrams */
if (cfpkt_getlen(pkt) > DGM_MTU)
return -EMSGSIZE;
cfpkt_add_head(pkt, &zero, 4);
/* Add info for MUX-layer to route the packet out. */

4
net/caif/cfpkt_skbuff.c
View file

@ -9,8 +9,8 @@
#include <linux/hardirq.h>
#include <net/caif/cfpkt.h>
#define PKT_PREFIX CAIF_NEEDED_HEADROOM
#define PKT_POSTFIX CAIF_NEEDED_TAILROOM
#define PKT_PREFIX 16
#define PKT_POSTFIX 2
#define PKT_LEN_WHEN_EXTENDING 128
#define PKT_ERROR(pkt, errmsg) do { \
cfpkt_priv(pkt)->erronous = true; \

7
net/caif/cfserl.c
View file

@ -14,7 +14,8 @@
#define container_obj(layr) ((struct cfserl *) layr)
#define CFSERL_STX 0x02
#define CAIF_MINIUM_PACKET_SIZE 4
#define SERIAL_MINIUM_PACKET_SIZE 4
#define SERIAL_MAX_FRAMESIZE 4096
struct cfserl {
struct cflayer layer;
struct cfpkt *incomplete_frm;
@ -119,8 +120,8 @@ static int cfserl_receive(struct cflayer *l, struct cfpkt *newpkt)
/*
* Frame error handling
*/
if (expectlen < CAIF_MINIUM_PACKET_SIZE
|| expectlen > CAIF_MAX_FRAMESIZE) {
if (expectlen < SERIAL_MINIUM_PACKET_SIZE
|| expectlen > SERIAL_MAX_FRAMESIZE) {
if (!layr->usestx) {
if (pkt != NULL)
cfpkt_destroy(pkt);

1
net/caif/cfsrvl.c
View file

@ -162,7 +162,6 @@ void cfservl_destroy(struct cflayer *layer)
void cfsrvl_release(struct kref *kref)
{
struct cfsrvl *service = container_of(kref, struct cfsrvl, ref);
pr_info("CAIF: %s(): enter\n", __func__);
kfree(service);
}

6
net/caif/cfutill.c
View file

@ -90,12 +90,6 @@ static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
if (!cfsrvl_ready(service, &ret))
return ret;
if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_err("CAIF: %s(): packet too large size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
cfpkt_add_head(pkt, &zero, 1);
/* Add info for MUX-layer to route the packet out. */
info = cfpkt_info(pkt);

5
net/caif/cfveil.c
View file

@ -84,11 +84,6 @@ static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
return ret;
caif_assert(layr->dn != NULL);
caif_assert(layr->dn->transmit != NULL);
if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
pr_warning("CAIF: %s(): Packet too large - size=%d\n",
__func__, cfpkt_getlen(pkt));
return -EOVERFLOW;
}
if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);

67
net/caif/chnl_net.c
View file

@ -23,7 +23,7 @@
#include <net/caif/caif_dev.h>
/* GPRS PDP connection has MTU to 1500 */
#define SIZE_MTU 1500
#define GPRS_PDP_MTU 1500
/* 5 sec. connect timeout */
#define CONNECT_TIMEOUT (5 * HZ)
#define CAIF_NET_DEFAULT_QUEUE_LEN 500
@ -232,6 +232,8 @@ static int chnl_net_open(struct net_device *dev)
{
struct chnl_net *priv = NULL;
int result = -1;
int llifindex, headroom, tailroom, mtu;
struct net_device *lldev;
ASSERT_RTNL();
priv = netdev_priv(dev);
if (!priv) {
@ -241,41 +243,88 @@ static int chnl_net_open(struct net_device *dev)
if (priv->state != CAIF_CONNECTING) {
priv->state = CAIF_CONNECTING;
result = caif_connect_client(&priv->conn_req, &priv->chnl);
result = caif_connect_client(&priv->conn_req, &priv->chnl,
&llifindex, &headroom, &tailroom);
if (result != 0) {
priv->state = CAIF_DISCONNECTED;
pr_debug("CAIF: %s(): err: "
"Unable to register and open device,"
" Err:%d\n",
__func__,
result);
return result;
goto error;
}
lldev = dev_get_by_index(dev_net(dev), llifindex);
if (lldev == NULL) {
pr_debug("CAIF: %s(): no interface?\n", __func__);
result = -ENODEV;
goto error;
}
dev->needed_tailroom = tailroom + lldev->needed_tailroom;
dev->hard_header_len = headroom + lldev->hard_header_len +
lldev->needed_tailroom;
/*
* MTU, head-room etc is not know before we have a
* CAIF link layer device available. MTU calculation may
* override initial RTNL configuration.
* MTU is minimum of current mtu, link layer mtu pluss
* CAIF head and tail, and PDP GPRS contexts max MTU.
*/
mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
mtu = min_t(int, GPRS_PDP_MTU, mtu);
dev_set_mtu(dev, mtu);
dev_put(lldev);
if (mtu < 100) {
pr_warning("CAIF: %s(): "
"CAIF Interface MTU too small (%d)\n",
__func__, mtu);
result = -ENODEV;
goto error;
}
}
rtnl_unlock(); /* Release RTNL lock during connect wait */
result = wait_event_interruptible_timeout(priv->netmgmt_wq,
priv->state != CAIF_CONNECTING,
CONNECT_TIMEOUT);
rtnl_lock();
if (result == -ERESTARTSYS) {
pr_debug("CAIF: %s(): wait_event_interruptible"
" woken by a signal\n", __func__);
return -ERESTARTSYS;
result = -ERESTARTSYS;
goto error;
}
if (result == 0) {
pr_debug("CAIF: %s(): connect timeout\n", __func__);
caif_disconnect_client(&priv->chnl);
priv->state = CAIF_DISCONNECTED;
pr_debug("CAIF: %s(): state disconnected\n", __func__);
return -ETIMEDOUT;
result = -ETIMEDOUT;
goto error;
}
if (priv->state != CAIF_CONNECTED) {
pr_debug("CAIF: %s(): connect failed\n", __func__);
return -ECONNREFUSED;
result = -ECONNREFUSED;
goto error;
}
pr_debug("CAIF: %s(): CAIF Netdevice connected\n", __func__);
return 0;
error:
caif_disconnect_client(&priv->chnl);
priv->state = CAIF_DISCONNECTED;
pr_debug("CAIF: %s(): state disconnected\n", __func__);
return result;
}
static int chnl_net_stop(struct net_device *dev)
@ -321,9 +370,7 @@ static void ipcaif_net_setup(struct net_device *dev)
dev->destructor = free_netdev;
dev->flags |= IFF_NOARP;
dev->flags |= IFF_POINTOPOINT;
dev->needed_headroom = CAIF_NEEDED_HEADROOM;
dev->needed_tailroom = CAIF_NEEDED_TAILROOM;
dev->mtu = SIZE_MTU;
dev->mtu = GPRS_PDP_MTU;
dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
priv = netdev_priv(dev);