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Diffstat (limited to 'drivers/net/wan/hdlc_fr.c')
-rw-r--r--drivers/net/wan/hdlc_fr.c101
1 files changed, 34 insertions, 67 deletions
diff --git a/drivers/net/wan/hdlc_fr.c b/drivers/net/wan/hdlc_fr.c
index 0720f5f92caa..72250fe0a1df 100644
--- a/drivers/net/wan/hdlc_fr.c
+++ b/drivers/net/wan/hdlc_fr.c
@@ -6,16 +6,16 @@
* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
*
- Theory of PVC state
+ Theory of PVC state
DCE mode:
(exist,new) -> 0,0 when "PVC create" or if "link unreliable"
- 0,x -> 1,1 if "link reliable" when sending FULL STATUS
- 1,1 -> 1,0 if received FULL STATUS ACK
+ 0,x -> 1,1 if "link reliable" when sending FULL STATUS
+ 1,1 -> 1,0 if received FULL STATUS ACK
(active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
- -> 1 when "PVC up" and (exist,new) = 1,0
+ -> 1 when "PVC up" and (exist,new) = 1,0
DTE mode:
(exist,new,active) = FULL STATUS if "link reliable"
@@ -60,7 +60,6 @@
#define NLPID_CCITT_ANSI_LMI 0x08
#define NLPID_CISCO_LMI 0x09
-
#define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */
#define LMI_CISCO_DLCI 1023
@@ -86,7 +85,6 @@
#define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */
#define LMI_ANSI_LENGTH 14
-
struct fr_hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
unsigned ea1: 1;
@@ -111,7 +109,6 @@ struct fr_hdr {
#endif
} __packed;
-
struct pvc_device {
struct net_device *frad;
struct net_device *main;
@@ -128,7 +125,7 @@ struct pvc_device {
unsigned int fecn: 1;
unsigned int becn: 1;
unsigned int bandwidth; /* Cisco LMI reporting only */
- }state;
+ } state;
};
struct frad_state {
@@ -149,29 +146,24 @@ struct frad_state {
u8 rxseq; /* RX sequence number */
};
-
static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
-
static inline u16 q922_to_dlci(u8 *hdr)
{
return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
}
-
static inline void dlci_to_q922(u8 *hdr, u16 dlci)
{
hdr[0] = (dlci >> 2) & 0xFC;
hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
}
-
-static inline struct frad_state* state(hdlc_device *hdlc)
+static inline struct frad_state *state(hdlc_device *hdlc)
{
- return(struct frad_state *)(hdlc->state);
+ return (struct frad_state *)(hdlc->state);
}
-
static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
{
struct pvc_device *pvc = state(hdlc)->first_pvc;
@@ -187,7 +179,6 @@ static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
return NULL;
}
-
static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -215,13 +206,11 @@ static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
return pvc;
}
-
static inline int pvc_is_used(struct pvc_device *pvc)
{
return pvc->main || pvc->ether;
}
-
static inline void pvc_carrier(int on, struct pvc_device *pvc)
{
if (on) {
@@ -241,7 +230,6 @@ static inline void pvc_carrier(int on, struct pvc_device *pvc)
}
}
-
static inline void delete_unused_pvcs(hdlc_device *hdlc)
{
struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
@@ -260,7 +248,6 @@ static inline void delete_unused_pvcs(hdlc_device *hdlc)
}
}
-
static inline struct net_device **get_dev_p(struct pvc_device *pvc,
int type)
{
@@ -270,7 +257,6 @@ static inline struct net_device **get_dev_p(struct pvc_device *pvc,
return &pvc->main;
}
-
static int fr_hard_header(struct sk_buff *skb, u16 dlci)
{
if (!skb->dev) { /* Control packets */
@@ -334,8 +320,6 @@ static int fr_hard_header(struct sk_buff *skb, u16 dlci)
return 0;
}
-
-
static int pvc_open(struct net_device *dev)
{
struct pvc_device *pvc = dev->ml_priv;
@@ -345,6 +329,7 @@ static int pvc_open(struct net_device *dev)
if (pvc->open_count++ == 0) {
hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
+
if (state(hdlc)->settings.lmi == LMI_NONE)
pvc->state.active = netif_carrier_ok(pvc->frad);
@@ -354,14 +339,13 @@ static int pvc_open(struct net_device *dev)
return 0;
}
-
-
static int pvc_close(struct net_device *dev)
{
struct pvc_device *pvc = dev->ml_priv;
if (--pvc->open_count == 0) {
hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
+
if (state(hdlc)->settings.lmi == LMI_NONE)
pvc->state.active = 0;
@@ -373,8 +357,6 @@ static int pvc_close(struct net_device *dev)
return 0;
}
-
-
static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct pvc_device *pvc = dev->ml_priv;
@@ -465,15 +447,12 @@ static inline void fr_log_dlci_active(struct pvc_device *pvc)
pvc->state.active ? "active" : "inactive");
}
-
-
static inline u8 fr_lmi_nextseq(u8 x)
{
x++;
return x ? x : 1;
}
-
static void fr_lmi_send(struct net_device *dev, int fullrep)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -495,17 +474,16 @@ static void fr_lmi_send(struct net_device *dev, int fullrep)
}
skb = dev_alloc_skb(len);
- if (!skb) {
- netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
+ if (!skb)
return;
- }
+
memset(skb->data, 0, len);
skb_reserve(skb, 4);
- if (lmi == LMI_CISCO) {
+ if (lmi == LMI_CISCO)
fr_hard_header(skb, LMI_CISCO_DLCI);
- } else {
+ else
fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);
- }
+
data = skb_tail_pointer(skb);
data[i++] = LMI_CALLREF;
data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
@@ -569,8 +547,6 @@ static void fr_lmi_send(struct net_device *dev, int fullrep)
dev_queue_xmit(skb);
}
-
-
static void fr_set_link_state(int reliable, struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -603,7 +579,6 @@ static void fr_set_link_state(int reliable, struct net_device *dev)
}
}
-
static void fr_timer(struct timer_list *t)
{
struct frad_state *st = from_timer(st, t, timer);
@@ -637,10 +612,10 @@ static void fr_timer(struct timer_list *t)
fr_set_link_state(reliable, dev);
}
- if (state(hdlc)->settings.dce)
+ if (state(hdlc)->settings.dce) {
state(hdlc)->timer.expires = jiffies +
state(hdlc)->settings.t392 * HZ;
- else {
+ } else {
if (state(hdlc)->n391cnt)
state(hdlc)->n391cnt--;
@@ -655,7 +630,6 @@ static void fr_timer(struct timer_list *t)
add_timer(&state(hdlc)->timer);
}
-
static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -696,8 +670,9 @@ static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
return 1;
}
i = 7;
- } else
+ } else {
i = 6;
+ }
if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
LMI_ANSI_CISCO_REPTYPE)) {
@@ -814,8 +789,8 @@ static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
}
i++;
- new = !! (skb->data[i + 2] & 0x08);
- active = !! (skb->data[i + 2] & 0x02);
+ new = !!(skb->data[i + 2] & 0x08);
+ active = !!(skb->data[i + 2] & 0x02);
if (lmi == LMI_CISCO) {
dlci = (skb->data[i] << 8) | skb->data[i + 1];
bw = (skb->data[i + 3] << 16) |
@@ -962,8 +937,8 @@ static int fr_rx(struct sk_buff *skb)
pvc->state.becn ^= 1;
}
-
- if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb) {
frad->stats.rx_dropped++;
return NET_RX_DROP;
}
@@ -1018,8 +993,6 @@ rx_drop:
return NET_RX_DROP;
}
-
-
static void fr_start(struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -1040,11 +1013,11 @@ static void fr_start(struct net_device *dev)
/* First poll after 1 s */
state(hdlc)->timer.expires = jiffies + HZ;
add_timer(&state(hdlc)->timer);
- } else
+ } else {
fr_set_link_state(1, dev);
+ }
}
-
static void fr_stop(struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -1056,7 +1029,6 @@ static void fr_stop(struct net_device *dev)
fr_set_link_state(0, dev);
}
-
static void fr_close(struct net_device *dev)
{
hdlc_device *hdlc = dev_to_hdlc(dev);
@@ -1071,7 +1043,6 @@ static void fr_close(struct net_device *dev)
}
}
-
static void pvc_setup(struct net_device *dev)
{
dev->type = ARPHRD_DLCI;
@@ -1095,7 +1066,8 @@ static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
struct net_device *dev;
int used;
- if ((pvc = add_pvc(frad, dlci)) == NULL) {
+ pvc = add_pvc(frad, dlci);
+ if (!pvc) {
netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
return -ENOBUFS;
}
@@ -1121,7 +1093,7 @@ static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
eth_hw_addr_random(dev);
} else {
- *(__be16*)dev->dev_addr = htons(dlci);
+ *(__be16 *)dev->dev_addr = htons(dlci);
dlci_to_q922(dev->broadcast, dlci);
}
dev->netdev_ops = &pvc_ops;
@@ -1147,17 +1119,17 @@ static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
return 0;
}
-
-
static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
{
struct pvc_device *pvc;
struct net_device *dev;
- if ((pvc = find_pvc(hdlc, dlci)) == NULL)
+ pvc = find_pvc(hdlc, dlci);
+ if (!pvc)
return -ENOENT;
- if ((dev = *get_dev_p(pvc, type)) == NULL)
+ dev = *get_dev_p(pvc, type);
+ if (!dev)
return -ENOENT;
if (dev->flags & IFF_UP)
@@ -1174,12 +1146,11 @@ static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
return 0;
}
-
-
static void fr_destroy(struct net_device *frad)
{
hdlc_device *hdlc = dev_to_hdlc(frad);
struct pvc_device *pvc = state(hdlc)->first_pvc;
+
state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
state(hdlc)->dce_pvc_count = 0;
state(hdlc)->dce_changed = 1;
@@ -1198,7 +1169,6 @@ static void fr_destroy(struct net_device *frad)
}
}
-
static struct hdlc_proto proto = {
.close = fr_close,
.start = fr_start,
@@ -1209,7 +1179,6 @@ static struct hdlc_proto proto = {
.module = THIS_MODULE,
};
-
static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
{
fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
@@ -1259,7 +1228,8 @@ static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
new_settings.dce != 1))
return -EINVAL;
- result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
+ result = hdlc->attach(dev, ENCODING_NRZ,
+ PARITY_CRC16_PR1_CCITT);
if (result)
return result;
@@ -1309,20 +1279,17 @@ static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
return -EINVAL;
}
-
static int __init mod_init(void)
{
register_hdlc_protocol(&proto);
return 0;
}
-
static void __exit mod_exit(void)
{
unregister_hdlc_protocol(&proto);
}
-
module_init(mod_init);
module_exit(mod_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 12:56:56 +0100