diff options
Diffstat (limited to 'drivers/net/hamradio')
| -rw-r--r-- | drivers/net/hamradio/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/net/hamradio/baycom_epp.c | 3 | ||||
| -rw-r--r-- | drivers/net/hamradio/baycom_par.c | 3 | ||||
| -rw-r--r-- | drivers/net/hamradio/baycom_ser_fdx.c | 3 | ||||
| -rw-r--r-- | drivers/net/hamradio/baycom_ser_hdx.c | 3 | ||||
| -rw-r--r-- | drivers/net/hamradio/mkiss.c | 1086 |
6 files changed, 533 insertions, 567 deletions
diff --git a/drivers/net/hamradio/Kconfig b/drivers/net/hamradio/Kconfig index 0cd54306e636..de087cd609d9 100644 --- a/drivers/net/hamradio/Kconfig +++ b/drivers/net/hamradio/Kconfig @@ -1,6 +1,6 @@ config MKISS tristate "Serial port KISS driver" - depends on AX25 && BROKEN_ON_SMP + depends on AX25 ---help--- KISS is a protocol used for the exchange of data between a computer and a Terminal Node Controller (a small embedded system commonly diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c index a7f15d9f13e5..5298096afbdb 100644 --- a/drivers/net/hamradio/baycom_epp.c +++ b/drivers/net/hamradio/baycom_epp.c @@ -54,6 +54,7 @@ #include <linux/kmod.h> #include <linux/hdlcdrv.h> #include <linux/baycom.h> +#include <linux/jiffies.h> #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) /* prototypes for ax25_encapsulate and ax25_rebuild_header */ #include <net/ax25.h> @@ -287,7 +288,7 @@ static inline void baycom_int_freq(struct baycom_state *bc) * measure the interrupt frequency */ bc->debug_vals.cur_intcnt++; - if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) { + if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { bc->debug_vals.last_jiffies = cur_jiffies; bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; bc->debug_vals.cur_intcnt = 0; diff --git a/drivers/net/hamradio/baycom_par.c b/drivers/net/hamradio/baycom_par.c index 612ad452bee0..3b1bef1ee215 100644 --- a/drivers/net/hamradio/baycom_par.c +++ b/drivers/net/hamradio/baycom_par.c @@ -84,6 +84,7 @@ #include <linux/baycom.h> #include <linux/parport.h> #include <linux/bitops.h> +#include <linux/jiffies.h> #include <asm/bug.h> #include <asm/system.h> @@ -165,7 +166,7 @@ static void __inline__ baycom_int_freq(struct baycom_state *bc) * measure the interrupt frequency */ bc->debug_vals.cur_intcnt++; - if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) { + if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { bc->debug_vals.last_jiffies = cur_jiffies; bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; bc->debug_vals.cur_intcnt = 0; diff --git a/drivers/net/hamradio/baycom_ser_fdx.c b/drivers/net/hamradio/baycom_ser_fdx.c index 25f270b05378..232793d2ce6b 100644 --- a/drivers/net/hamradio/baycom_ser_fdx.c +++ b/drivers/net/hamradio/baycom_ser_fdx.c @@ -79,6 +79,7 @@ #include <asm/io.h> #include <linux/hdlcdrv.h> #include <linux/baycom.h> +#include <linux/jiffies.h> /* --------------------------------------------------------------------- */ @@ -159,7 +160,7 @@ static inline void baycom_int_freq(struct baycom_state *bc) * measure the interrupt frequency */ bc->debug_vals.cur_intcnt++; - if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) { + if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { bc->debug_vals.last_jiffies = cur_jiffies; bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; bc->debug_vals.cur_intcnt = 0; diff --git a/drivers/net/hamradio/baycom_ser_hdx.c b/drivers/net/hamradio/baycom_ser_hdx.c index eead85d00962..be596a3eb3fd 100644 --- a/drivers/net/hamradio/baycom_ser_hdx.c +++ b/drivers/net/hamradio/baycom_ser_hdx.c @@ -69,6 +69,7 @@ #include <asm/io.h> #include <linux/hdlcdrv.h> #include <linux/baycom.h> +#include <linux/jiffies.h> /* --------------------------------------------------------------------- */ @@ -150,7 +151,7 @@ static inline void baycom_int_freq(struct baycom_state *bc) * measure the interrupt frequency */ bc->debug_vals.cur_intcnt++; - if ((cur_jiffies - bc->debug_vals.last_jiffies) >= HZ) { + if (time_after_eq(cur_jiffies, bc->debug_vals.last_jiffies + HZ)) { bc->debug_vals.last_jiffies = cur_jiffies; bc->debug_vals.last_intcnt = bc->debug_vals.cur_intcnt; bc->debug_vals.cur_intcnt = 0; diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c index 3035422f5ad8..63b1a2b86acb 100644 --- a/drivers/net/hamradio/mkiss.c +++ b/drivers/net/hamradio/mkiss.c @@ -1,30 +1,19 @@ /* - * MKISS Driver + * This program is free software; you can distribute it and/or modify it + * under the terms of the GNU General Public License (Version 2) as + * published by the Free Software Foundation. * - * This module: - * This module is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. * - * This module implements the AX.25 protocol for kernel-based - * devices like TTYs. It interfaces between a raw TTY, and the - * kernel's AX.25 protocol layers, just like slip.c. - * AX.25 needs to be separated from slip.c while slip.c is no - * longer a static kernel device since it is a module. - * This method clears the way to implement other kiss protocols - * like mkiss smack g8bpq ..... so far only mkiss is implemented. + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * - * Hans Alblas <hans@esrac.ele.tue.nl> - * - * History - * Jonathan (G4KLX) Fixed to match Linux networking changes - 2.1.15. - * Matthias (DG2FEF) Added support for FlexNet CRC (on special request) - * Fixed bug in ax25_close(): dev_lock_wait() was - * called twice, causing a deadlock. - * Jeroen (PE1RXQ) Removed old MKISS_MAGIC stuff and calls to - * MOD_*_USE_COUNT - * Remove cli() and fix rtnl lock usage. + * Copyright (C) Hans Alblas PE1AYX <hans@esrac.ele.tue.nl> + * Copyright (C) 2004, 05 Ralf Baechle DL5RB <ralf@linux-mips.org> */ #include <linux/config.h> @@ -46,177 +35,300 @@ #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/if_arp.h> +#include <linux/jiffies.h> #include <net/ax25.h> -#include "mkiss.h" - #ifdef CONFIG_INET #include <linux/ip.h> #include <linux/tcp.h> #endif -static char banner[] __initdata = KERN_INFO "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; - -typedef struct ax25_ctrl { - struct ax_disp ctrl; /* */ - struct net_device dev; /* the device */ -} ax25_ctrl_t; - -static ax25_ctrl_t **ax25_ctrls; - -int ax25_maxdev = AX25_MAXDEV; /* Can be overridden with insmod! */ - -static struct tty_ldisc ax_ldisc; - -static int ax25_init(struct net_device *); -static int kiss_esc(unsigned char *, unsigned char *, int); -static int kiss_esc_crc(unsigned char *, unsigned char *, unsigned short, int); -static void kiss_unesc(struct ax_disp *, unsigned char); +#define AX_MTU 236 + +/* SLIP/KISS protocol characters. */ +#define END 0300 /* indicates end of frame */ +#define ESC 0333 /* indicates byte stuffing */ +#define ESC_END 0334 /* ESC ESC_END means END 'data' */ +#define ESC_ESC 0335 /* ESC ESC_ESC means ESC 'data' */ + +struct mkiss { + struct tty_struct *tty; /* ptr to TTY structure */ + struct net_device *dev; /* easy for intr handling */ + + /* These are pointers to the malloc()ed frame buffers. */ + spinlock_t buflock;/* lock for rbuf and xbuf */ + unsigned char *rbuff; /* receiver buffer */ + int rcount; /* received chars counter */ + unsigned char *xbuff; /* transmitter buffer */ + unsigned char *xhead; /* pointer to next byte to XMIT */ + int xleft; /* bytes left in XMIT queue */ + + struct net_device_stats stats; + + /* Detailed SLIP statistics. */ + int mtu; /* Our mtu (to spot changes!) */ + int buffsize; /* Max buffers sizes */ + + unsigned long flags; /* Flag values/ mode etc */ + /* long req'd: used by set_bit --RR */ +#define AXF_INUSE 0 /* Channel in use */ +#define AXF_ESCAPE 1 /* ESC received */ +#define AXF_ERROR 2 /* Parity, etc. error */ +#define AXF_KEEPTEST 3 /* Keepalive test flag */ +#define AXF_OUTWAIT 4 /* is outpacket was flag */ + + int mode; + int crcmode; /* MW: for FlexNet, SMACK etc. */ +#define CRC_MODE_NONE 0 +#define CRC_MODE_FLEX 1 +#define CRC_MODE_SMACK 2 + + atomic_t refcnt; + struct semaphore dead_sem; +}; /*---------------------------------------------------------------------------*/ -static const unsigned short Crc_flex_table[] = { - 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38, - 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770, - 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9, - 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1, - 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a, - 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672, - 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb, - 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3, - 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c, - 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574, - 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd, - 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5, - 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e, - 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476, - 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf, - 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7, - 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30, - 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378, - 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1, - 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9, - 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32, - 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a, - 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3, - 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb, - 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34, - 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c, - 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5, - 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd, - 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36, - 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e, - 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7, - 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff +static const unsigned short crc_flex_table[] = { + 0x0f87, 0x1e0e, 0x2c95, 0x3d1c, 0x49a3, 0x582a, 0x6ab1, 0x7b38, + 0x83cf, 0x9246, 0xa0dd, 0xb154, 0xc5eb, 0xd462, 0xe6f9, 0xf770, + 0x1f06, 0x0e8f, 0x3c14, 0x2d9d, 0x5922, 0x48ab, 0x7a30, 0x6bb9, + 0x934e, 0x82c7, 0xb05c, 0xa1d5, 0xd56a, 0xc4e3, 0xf678, 0xe7f1, + 0x2e85, 0x3f0c, 0x0d97, 0x1c1e, 0x68a1, 0x7928, 0x4bb3, 0x5a3a, + 0xa2cd, 0xb344, 0x81df, 0x9056, 0xe4e9, 0xf560, 0xc7fb, 0xd672, + 0x3e04, 0x2f8d, 0x1d16, 0x0c9f, 0x7820, 0x69a9, 0x5b32, 0x4abb, + 0xb24c, 0xa3c5, 0x915e, 0x80d7, 0xf468, 0xe5e1, 0xd77a, 0xc6f3, + 0x4d83, 0x5c0a, 0x6e91, 0x7f18, 0x0ba7, 0x1a2e, 0x28b5, 0x393c, + 0xc1cb, 0xd042, 0xe2d9, 0xf350, 0x87ef, 0x9666, 0xa4fd, 0xb574, + 0x5d02, 0x4c8b, 0x7e10, 0x6f99, 0x1b26, 0x0aaf, 0x3834, 0x29bd, + 0xd14a, 0xc0c3, 0xf258, 0xe3d1, 0x976e, 0x86e7, 0xb47c, 0xa5f5, + 0x6c81, 0x7d08, 0x4f93, 0x5e1a, 0x2aa5, 0x3b2c, 0x09b7, 0x183e, + 0xe0c9, 0xf140, 0xc3db, 0xd252, 0xa6ed, 0xb764, 0x85ff, 0x9476, + 0x7c00, 0x6d89, 0x5f12, 0x4e9b, 0x3a24, 0x2bad, 0x1936, 0x08bf, + 0xf048, 0xe1c1, 0xd35a, 0xc2d3, 0xb66c, 0xa7e5, 0x957e, 0x84f7, + 0x8b8f, 0x9a06, 0xa89d, 0xb914, 0xcdab, 0xdc22, 0xeeb9, 0xff30, + 0x07c7, 0x164e, 0x24d5, 0x355c, 0x41e3, 0x506a, 0x62f1, 0x7378, + 0x9b0e, 0x8a87, 0xb81c, 0xa995, 0xdd2a, 0xcca3, 0xfe38, 0xefb1, + 0x1746, 0x06cf, 0x3454, 0x25dd, 0x5162, 0x40eb, 0x7270, 0x63f9, + 0xaa8d, 0xbb04, 0x899f, 0x9816, 0xeca9, 0xfd20, 0xcfbb, 0xde32, + 0x26c5, 0x374c, 0x05d7, 0x145e, 0x60e1, 0x7168, 0x43f3, 0x527a, + 0xba0c, 0xab85, 0x991e, 0x8897, 0xfc28, 0xeda1, 0xdf3a, 0xceb3, + 0x3644, 0x27cd, 0x1556, 0x04df, 0x7060, 0x61e9, 0x5372, 0x42fb, + 0xc98b, 0xd802, 0xea99, 0xfb10, 0x8faf, 0x9e26, 0xacbd, 0xbd34, + 0x45c3, 0x544a, 0x66d1, 0x7758, 0x03e7, 0x126e, 0x20f5, 0x317c, + 0xd90a, 0xc883, 0xfa18, 0xeb91, 0x9f2e, 0x8ea7, 0xbc3c, 0xadb5, + 0x5542, 0x44cb, 0x7650, 0x67d9, 0x1366, 0x02ef, 0x3074, 0x21fd, + 0xe889, 0xf900, 0xcb9b, 0xda12, 0xaead, 0xbf24, 0x8dbf, 0x9c36, + 0x64c1, 0x7548, 0x47d3, 0x565a, 0x22e5, 0x336c, 0x01f7, 0x107e, + 0xf808, 0xe981, 0xdb1a, 0xca93, 0xbe2c, 0xafa5, 0x9d3e, 0x8cb7, + 0x7440, 0x65c9, 0x5752, 0x46db, 0x3264, 0x23ed, 0x1176, 0x00ff }; -/*---------------------------------------------------------------------------*/ - static unsigned short calc_crc_flex(unsigned char *cp, int size) { - unsigned short crc = 0xffff; - - while (size--) - crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; + unsigned short crc = 0xffff; - return crc; -} + while (size--) + crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; -/*---------------------------------------------------------------------------*/ + return crc; +} static int check_crc_flex(unsigned char *cp, int size) { - unsigned short crc = 0xffff; + unsigned short crc = 0xffff; - if (size < 3) - return -1; + if (size < 3) + return -1; - while (size--) - crc = (crc << 8) ^ Crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; + while (size--) + crc = (crc << 8) ^ crc_flex_table[((crc >> 8) ^ *cp++) & 0xff]; - if ((crc & 0xffff) != 0x7070) - return -1; + if ((crc & 0xffff) != 0x7070) + return -1; - return 0; + return 0; } -/*---------------------------------------------------------------------------*/ +/* + * Standard encapsulation + */ -/* Find a free channel, and link in this `tty' line. */ -static inline struct ax_disp *ax_alloc(void) +static int kiss_esc(unsigned char *s, unsigned char *d, int len) { - ax25_ctrl_t *axp=NULL; - int i; + unsigned char *ptr = d; + unsigned char c; - for (i = 0; i < ax25_maxdev; i++) { - axp = ax25_ctrls[i]; + /* + * Send an initial END character to flush out any data that may have + * accumulated in the receiver due to line noise. + */ - /* Not allocated ? */ - if (axp == NULL) - break; + *ptr++ = END; - /* Not in use ? */ - if (!test_and_set_bit(AXF_INUSE, &axp->ctrl.flags)) + while (len-- > 0) { + switch (c = *s++) { + case END: + *ptr++ = ESC; + *ptr++ = ESC_END; break; + case ESC: + *ptr++ = ESC; + *ptr++ = ESC_ESC; + break; + default: + *ptr++ = c; + break; + } } - /* Sorry, too many, all slots in use */ - if (i >= ax25_maxdev) - return NULL; + *ptr++ = END; + + return ptr - d; +} + +/* + * MW: + * OK its ugly, but tell me a better solution without copying the + * packet to a temporary buffer :-) + */ +static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, + int len) +{ + unsigned char *ptr = d; + unsigned char c=0; + + *ptr++ = END; + while (len > 0) { + if (len > 2) + c = *s++; + else if (len > 1) + c = crc >> 8; + else if (len > 0) + c = crc & 0xff; + + len--; - /* If no channels are available, allocate one */ - if (axp == NULL && (ax25_ctrls[i] = kmalloc(sizeof(ax25_ctrl_t), GFP_KERNEL)) != NULL) { - axp = ax25_ctrls[i]; + switch (c) { + case END: + *ptr++ = ESC; + *ptr++ = ESC_END; + break; + case ESC: + *ptr++ = ESC; + *ptr++ = ESC_ESC; + break; + default: + *ptr++ = c; + break; + } } - memset(axp, 0, sizeof(ax25_ctrl_t)); - - /* Initialize channel control data */ - set_bit(AXF_INUSE, &axp->ctrl.flags); - sprintf(axp->dev.name, "ax%d", i++); - axp->ctrl.tty = NULL; - axp->dev.base_addr = i; - axp->dev.priv = (void *)&axp->ctrl; - axp->dev.next = NULL; - axp->dev.init = ax25_init; - - if (axp != NULL) { - /* - * register device so that it can be ifconfig'ed - * ax25_init() will be called as a side-effect - * SIDE-EFFECT WARNING: ax25_init() CLEARS axp->ctrl ! - */ - if (register_netdev(&axp->dev) == 0) { - /* (Re-)Set the INUSE bit. Very Important! */ - set_bit(AXF_INUSE, &axp->ctrl.flags); - axp->ctrl.dev = &axp->dev; - axp->dev.priv = (void *) &axp->ctrl; - - return &axp->ctrl; - } else { - clear_bit(AXF_INUSE,&axp->ctrl.flags); - printk(KERN_ERR "mkiss: ax_alloc() - register_netdev() failure.\n"); + *ptr++ = END; + + return ptr - d; +} + +/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */ +static void ax_bump(struct mkiss *ax) +{ + struct sk_buff *skb; + int count; + + spin_lock_bh(&ax->buflock); + if (ax->rbuff[0] > 0x0f) { + if (ax->rbuff[0] & 0x20) { + ax->crcmode = CRC_MODE_FLEX; + if (check_crc_flex(ax->rbuff, ax->rcount) < 0) { + ax->stats.rx_errors++; + return; + } + ax->rcount -= 2; + /* dl9sau bugfix: the trailling two bytes flexnet crc + * will not be passed to the kernel. thus we have + * to correct the kissparm signature, because it + * indicates a crc but there's none + */ + *ax->rbuff &= ~0x20; } + } + spin_unlock_bh(&ax->buflock); + + count = ax->rcount; + + if ((skb = dev_alloc_skb(count)) == NULL) { + printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", + ax->dev->name); + ax->stats.rx_dropped++; + return; } - return NULL; + spin_lock_bh(&ax->buflock); + memcpy(skb_put(skb,count), ax->rbuff, count); + spin_unlock_bh(&ax->buflock); + skb->protocol = ax25_type_trans(skb, ax->dev); + netif_rx(skb); + ax->dev->last_rx = jiffies; + ax->stats.rx_packets++; + ax->stats.rx_bytes += count; } -/* Free an AX25 channel. */ -static inline void ax_free(struct ax_disp *ax) +static void kiss_unesc(struct mkiss *ax, unsigned char s) { - /* Free all AX25 frame buffers. */ - if (ax->rbuff) - kfree(ax->rbuff); - ax->rbuff = NULL; - if (ax->xbuff) - kfree(ax->xbuff); - ax->xbuff = NULL; - if (!test_and_clear_bit(AXF_INUSE, &ax->flags)) - printk(KERN_ERR "mkiss: %s: ax_free for already free unit.\n", ax->dev->name); + switch (s) { + case END: + /* drop keeptest bit = VSV */ + if (test_bit(AXF_KEEPTEST, &ax->flags)) + clear_bit(AXF_KEEPTEST, &ax->flags); + + if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2)) + ax_bump(ax); + + clear_bit(AXF_ESCAPE, &ax->flags); + ax->rcount = 0; + return; + + case ESC: + set_bit(AXF_ESCAPE, &ax->flags); + return; + case ESC_ESC: + if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) + s = ESC; + break; + case ESC_END: + if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) + s = END; + break; + } + + spin_lock_bh(&ax->buflock); + if (!test_bit(AXF_ERROR, &ax->flags)) { + if (ax->rcount < ax->buffsize) { + ax->rbuff[ax->rcount++] = s; + spin_unlock_bh(&ax->buflock); + return; + } + + ax->stats.rx_over_errors++; + set_bit(AXF_ERROR, &ax->flags); + } + spin_unlock_bh(&ax->buflock); +} + +static int ax_set_mac_address(struct net_device *dev, void *addr) +{ + struct sockaddr_ax25 *sa = addr; + + spin_lock_irq(&dev->xmit_lock); + memcpy(dev->dev_addr, &sa->sax25_call, AX25_ADDR_LEN); + spin_unlock_irq(&dev->xmit_lock); + + return 0; } -static void ax_changedmtu(struct ax_disp *ax) +/*---------------------------------------------------------------------------*/ + +static void ax_changedmtu(struct mkiss *ax) { struct net_device *dev = ax->dev; unsigned char *xbuff, *rbuff, *oxbuff, *orbuff; @@ -236,7 +348,8 @@ static void ax_changedmtu(struct ax_disp *ax) rbuff = kmalloc(len + 4, GFP_ATOMIC); if (xbuff == NULL || rbuff == NULL) { - printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, MTU change cancelled.\n", + printk(KERN_ERR "mkiss: %s: unable to grow ax25 buffers, " + "MTU change cancelled.\n", ax->dev->name); dev->mtu = ax->mtu; if (xbuff != NULL) @@ -258,7 +371,7 @@ static void ax_changedmtu(struct ax_disp *ax) memcpy(ax->xbuff, ax->xhead, ax->xleft); } else { ax->xleft = 0; - ax->tx_dropped++; + ax->stats.tx_dropped++; } } @@ -269,7 +382,7 @@ static void ax_changedmtu(struct ax_disp *ax) memcpy(ax->rbuff, orbuff, ax->rcount); } else { ax->rcount = 0; - ax->rx_over_errors++; + ax->stats.rx_over_errors++; set_bit(AXF_ERROR, &ax->flags); } } @@ -279,72 +392,14 @@ static void ax_changedmtu(struct ax_disp *ax) spin_unlock_bh(&ax->buflock); - if (oxbuff != NULL) - kfree(oxbuff); - if (orbuff != NULL) - kfree(orbuff); -} - - -/* Set the "sending" flag. This must be atomic. */ -static inline void ax_lock(struct ax_disp *ax) -{ - netif_stop_queue(ax->dev); -} - - -/* Clear the "sending" flag. This must be atomic. */ -static inline void ax_unlock(struct ax_disp *ax) -{ - netif_start_queue(ax->dev); -} - -/* Send one completely decapsulated AX.25 packet to the AX.25 layer. */ -static void ax_bump(struct ax_disp *ax) -{ - struct sk_buff *skb; - int count; - - spin_lock_bh(&ax->buflock); - if (ax->rbuff[0] > 0x0f) { - if (ax->rbuff[0] & 0x20) { - ax->crcmode = CRC_MODE_FLEX; - if (check_crc_flex(ax->rbuff, ax->rcount) < 0) { - ax->rx_errors++; - return; - } - ax->rcount -= 2; - /* dl9sau bugfix: the trailling two bytes flexnet crc - * will not be passed to the kernel. thus we have - * to correct the kissparm signature, because it - * indicates a crc but there's none - */ - *ax->rbuff &= ~0x20; - } - } - spin_unlock_bh(&ax->buflock); - - count = ax->rcount; - - if ((skb = dev_alloc_skb(count)) == NULL) { - printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", ax->dev->name); - ax->rx_dropped++; - return; - } - - spin_lock_bh(&ax->buflock); - memcpy(skb_put(skb,count), ax->rbuff, count); - spin_unlock_bh(&ax->buflock); - skb->protocol = ax25_type_trans(skb, ax->dev); - netif_rx(skb); - ax->dev->last_rx = jiffies; - ax->rx_packets++; - ax->rx_bytes+=count; + kfree(oxbuff); + kfree(orbuff); } /* Encapsulate one AX.25 packet and stuff into a TTY queue. */ -static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) +static void ax_encaps(struct net_device *dev, unsigned char *icp, int len) { + struct mkiss *ax = netdev_priv(dev); unsigned char *p; int actual, count; @@ -354,8 +409,8 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) if (len > ax->mtu) { /* Sigh, shouldn't occur BUT ... */ len = ax->mtu; printk(KERN_ERR "mkiss: %s: truncating oversized transmit packet!\n", ax->dev->name); - ax->tx_dropped++; - ax_unlock(ax); + ax->stats.tx_dropped++; + netif_start_queue(dev); return; } @@ -376,10 +431,11 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) break; } - ax->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); + set_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); actual = ax->tty->driver->write(ax->tty, ax->xbuff, count); - ax->tx_packets++; - ax->tx_bytes+=actual; + ax->stats.tx_packets++; + ax->stats.tx_bytes += actual; + ax->dev->trans_start = jiffies; ax->xleft = count - actual; ax->xhead = ax->xbuff + actual; @@ -387,37 +443,10 @@ static void ax_encaps(struct ax_disp *ax, unsigned char *icp, int len) spin_unlock_bh(&ax->buflock); } -/* - * Called by the driver when there's room for more data. If we have - * more packets to send, we send them here. - */ -static void ax25_write_wakeup(struct tty_struct *tty) -{ - int actual; - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; - - /* First make sure we're connected. */ - if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev)) - return; - if (ax->xleft <= 0) { - /* Now serial buffer is almost free & we can start - * transmission of another packet - */ - tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); - - netif_wake_queue(ax->dev); - return; - } - - actual = tty->driver->write(tty, ax->xhead, ax->xleft); - ax->xleft -= actual; - ax->xhead += actual; -} - /* Encapsulate an AX.25 packet and kick it into a TTY queue. */ static int ax_xmit(struct sk_buff *skb, struct net_device *dev) { - struct ax_disp *ax = netdev_priv(dev); + struct mkiss *ax = netdev_priv(dev); if (!netif_running(dev)) { printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name); @@ -429,7 +458,7 @@ static int ax_xmit(struct sk_buff *skb, struct net_device *dev) * May be we must check transmitter timeout here ? * 14 Oct 1994 Dmitry Gorodchanin. */ - if (jiffies - dev->trans_start < 20 * HZ) { + if (time_before(jiffies, dev->trans_start + 20 * HZ)) { /* 20 sec timeout not reached */ return 1; } @@ -439,20 +468,30 @@ static int ax_xmit(struct sk_buff *skb, struct net_device *dev) "bad line quality" : "driver error"); ax->xleft = 0; - ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); - ax_unlock(ax); + clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); + netif_start_queue(dev); } /* We were not busy, so we are now... :-) */ if (skb != NULL) { - ax_lock(ax); - ax_encaps(ax, skb->data, skb->len); + netif_stop_queue(dev); + ax_encaps(dev, skb->data, skb->len); kfree_skb(skb); } return 0; } +static int ax_open_dev(struct net_device *dev) +{ + struct mkiss *ax = netdev_priv(dev); + + if (ax->tty == NULL) + return -ENODEV; + + return 0; +} + #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE) /* Return the frame type ID */ @@ -481,7 +520,7 @@ static int ax_rebuild_header(struct sk_buff *skb) /* Open the low-level part of the AX25 channel. Easy! */ static int ax_open(struct net_device *dev) { - struct ax_disp *ax = netdev_priv(dev); + struct mkiss *ax = netdev_priv(dev); unsigned long len; if (ax->tty == NULL) @@ -518,7 +557,6 @@ static int ax_open(struct net_device *dev) spin_lock_init(&ax->buflock); - netif_start_queue(dev); return 0; noxbuff: @@ -532,68 +570,100 @@ norbuff: /* Close the low-level part of the AX25 channel. Easy! */ static int ax_close(struct net_device *dev) { - struct ax_disp *ax = netdev_priv(dev); + struct mkiss *ax = netdev_priv(dev); - if (ax->tty == NULL) - return -EBUSY; - - ax->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); + if (ax->tty) + clear_bit(TTY_DO_WRITE_WAKEUP, &ax->tty->flags); netif_stop_queue(dev); return 0; } -static int ax25_receive_room(struct tty_struct *tty) +static struct net_device_stats *ax_get_stats(struct net_device *dev) { - return 65536; /* We can handle an infinite amount of data. :-) */ + struct mkiss *ax = netdev_priv(dev); + + return &ax->stats; +} + +static void ax_setup(struct net_device *dev) +{ + static char ax25_bcast[AX25_ADDR_LEN] = + {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1}; + static char ax25_test[AX25_ADDR_LEN] = + {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1}; + + /* Finish setting up the DEVICE info. */ + dev->mtu = AX_MTU; + dev->hard_start_xmit = ax_xmit; + dev->open = ax_open_dev; + dev->stop = ax_close; + dev->get_stats = ax_get_stats; + dev->set_mac_address = ax_set_mac_address; + dev->hard_header_len = 0; + dev->addr_len = 0; + dev->type = ARPHRD_AX25; + dev->tx_queue_len = 10; + dev->hard_header = ax_header; + dev->rebuild_header = ax_rebuild_header; + + memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN); + memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN); + + dev->flags = IFF_BROADCAST | IFF_MULTICAST; } /* - * Handle the 'receiver data ready' interrupt. - * This function is called by the 'tty_io' module in the kernel when - * a block of data has been received, which can now be decapsulated - * and sent on to the AX.25 layer for further processing. + * We have a potential race on dereferencing tty->disc_data, because the tty + * layer provides no locking at all - thus one cpu could be running + * sixpack_receive_buf while another calls sixpack_close, which zeroes + * tty->disc_data and frees the memory that sixpack_receive_buf is using. The + * best way to fix this is to use a rwlock in the tty struct, but for now we + * use a single global rwlock for all ttys in ppp line discipline. */ -static void ax25_receive_buf(struct tty_struct *tty, const unsigned char *cp, char *fp, int count) +static rwlock_t disc_data_lock = RW_LOCK_UNLOCKED; + +static struct mkiss *mkiss_get(struct tty_struct *tty) { - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; + struct mkiss *ax; - if (ax == NULL || ax->magic != AX25_MAGIC || !netif_running(ax->dev)) - return; + read_lock(&disc_data_lock); + ax = tty->disc_data; + if (ax) + atomic_inc(&ax->refcnt); + read_unlock(&disc_data_lock); - /* - * Argh! mtu change time! - costs us the packet part received - * at the change - */ - if (ax->mtu != ax->dev->mtu + 73) - ax_changedmtu(ax); - - /* Read the characters out of the buffer */ - while (count--) { - if (fp != NULL && *fp++) { - if (!test_and_set_bit(AXF_ERROR, &ax->flags)) - ax->rx_errors++; - cp++; - continue; - } + return ax; +} - kiss_unesc(ax, *cp++); - } +static void mkiss_put(struct mkiss *ax) +{ + if (atomic_dec_and_test(&ax->refcnt)) + up(&ax->dead_sem); } -static int ax25_open(struct tty_struct *tty) +static int mkiss_open(struct tty_struct *tty) { - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; + struct net_device *dev; + struct mkiss *ax; int err; - /* First make sure we're not already connected. */ - if (ax && ax->magic == AX25_MAGIC) - return -EEXIST; + if (!capable(CAP_NET_ADMIN)) + return -EPERM; - /* OK. Find a free AX25 channel to use. */ - if ((ax = ax_alloc()) == NULL) - return -ENFILE; + dev = alloc_netdev(sizeof(struct mkiss), "ax%d", ax_setup); + if (!dev) { + err = -ENOMEM; + goto out; + } + + ax = netdev_priv(dev); + ax->dev = dev; + + spin_lock_init(&ax->buflock); + atomic_set(&ax->refcnt, 1); + init_MUTEX_LOCKED(&ax->dead_sem); ax->tty = tty; tty->disc_data = ax; @@ -602,283 +672,212 @@ static int ax25_open(struct tty_struct *tty) tty->driver->flush_buffer(tty); /* Restore default settings */ - ax->dev->type = ARPHRD_AX25; + dev->type = ARPHRD_AX25; /* Perform the low-level AX25 initialization. */ - if ((err = ax_open(ax->dev))) - return err; + if ((err = ax_open(ax->dev))) { + goto out_free_netdev; + } - /* Done. We have linked the TTY line to a channel. */ - return ax->dev->base_addr; -} + if (register_netdev(dev)) + goto out_free_buffers; -static void ax25_close(struct tty_struct *tty) -{ - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; + netif_start_queue(dev); - /* First make sure we're connected. */ - if (ax == NULL || ax->magic != AX25_MAGIC) - return; + /* Done. We have linked the TTY line to a channel. */ + return 0; - unregister_netdev(ax->dev); +out_free_buffers: + kfree(ax->rbuff); + kfree(ax->xbuff); - tty->disc_data = NULL; - ax->tty = NULL; +out_free_netdev: + free_netdev(dev); - ax_free(ax); +out: + return err; } - -static struct net_device_stats *ax_get_stats(struct net_device *dev) +static void mkiss_close(struct tty_struct *tty) { - static struct net_device_stats stats; - struct ax_disp *ax = netdev_priv(dev); - - memset(&stats, 0, sizeof(struct net_device_stats)); - - stats.rx_packets = ax->rx_packets; - stats.tx_packets = ax->tx_packets; - stats.rx_bytes = ax->rx_bytes; - stats.tx_bytes = ax->tx_bytes; - stats.rx_dropped = ax->rx_dropped; - stats.tx_dropped = ax->tx_dropped; - stats.tx_errors = ax->tx_errors; - stats.rx_errors = ax->rx_errors; - stats.rx_over_errors = ax->rx_over_errors; - - return &stats; -} + struct mkiss *ax; + write_lock(&disc_data_lock); + ax = tty->disc_data; + tty->disc_data = NULL; + write_unlock(&disc_data_lock); -/************************************************************************ - * STANDARD ENCAPSULATION * - ************************************************************************/ - -static int kiss_esc(unsigned char *s, unsigned char *d, int len) -{ - unsigned char *ptr = d; - unsigned char c; + if (ax == 0) + return; /* - * Send an initial END character to flush out any - * data that may have accumulated in the receiver - * due to line noise. + * We have now ensured that nobody can start using ap from now on, but + * we have to wait for all existing users to finish. */ + if (!atomic_dec_and_test(&ax->refcnt)) + down(&ax->dead_sem); - *ptr++ = END; - - while (len-- > 0) { - switch (c = *s++) { - case END: - *ptr++ = ESC; - *ptr++ = ESC_END; - break; - case ESC: - *ptr++ = ESC; - *ptr++ = ESC_ESC; - break; - default: - *ptr++ = c; - break; - } - } + unregister_netdev(ax->dev); - *ptr++ = END; + /* Free all AX25 frame buffers. */ + kfree(ax->rbuff); + kfree(ax->xbuff); - return ptr - d; + ax->tty = NULL; } -/* - * MW: - * OK its ugly, but tell me a better solution without copying the - * packet to a temporary buffer :-) - */ -static int kiss_esc_crc(unsigned char *s, unsigned char *d, unsigned short crc, int len) +/* Perform I/O control on an active ax25 channel. */ +static int mkiss_ioctl(struct tty_struct *tty, struct file *file, + unsigned int cmd, unsigned long arg) { - unsigned char *ptr = d; - unsigned char c=0; - - *ptr++ = END; - while (len > 0) { - if (len > 2) - c = *s++; - else if (len > 1) - c = crc >> 8; - else if (len > 0) - c = crc & 0xff; + struct mkiss *ax = mkiss_get(tty); + struct net_device *dev = ax->dev; + unsigned int tmp, err; - len--; + /* First make sure we're connected. */ + if (ax == NULL) + return -ENXIO; - switch (c) { - case END: - *ptr++ = ESC; - *ptr++ = ESC_END; - break; - case ESC: - *ptr++ = ESC; - *ptr++ = ESC_ESC; - break; - default: - *ptr++ = c; - break; + switch (cmd) { + case SIOCGIFNAME: + err = copy_to_user((void __user *) arg, ax->dev->name, + strlen(ax->dev->name) + 1) ? -EFAULT : 0; + break; + + case SIOCGIFENCAP: + err = put_user(4, (int __user *) arg); + break; + + case SIOCSIFENCAP: + if (get_user(tmp, (int __user *) arg)) { + err = -EFAULT; + break; } - } - *ptr++ = END; - return ptr - d; -} -static void kiss_unesc(struct ax_disp *ax, unsigned char s) -{ - switch (s) { - case END: - /* drop keeptest bit = VSV */ - if (test_bit(AXF_KEEPTEST, &ax->flags)) - clear_bit(AXF_KEEPTEST, &ax->flags); + ax->mode = tmp; + dev->addr_len = AX25_ADDR_LEN; + dev->hard_header_len = AX25_KISS_HEADER_LEN + + AX25_MAX_HEADER_LEN + 3; + dev->type = ARPHRD_AX25; - if (!test_and_clear_bit(AXF_ERROR, &ax->flags) && (ax->rcount > 2)) - ax_bump(ax); + err = 0; + break; - clear_bit(AXF_ESCAPE, &ax->flags); - ax->rcount = 0; - return; + case SIOCSIFHWADDR: { + char addr[AX25_ADDR_LEN]; +printk(KERN_INFO "In SIOCSIFHWADDR"); - case ESC: - set_bit(AXF_ESCAPE, &ax->flags); - return; - case ESC_ESC: - if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) - s = ESC; + if (copy_from_user(&addr, + (void __user *) arg, AX25_ADDR_LEN)) { + err = -EFAULT; break; - case ESC_END: - if (test_and_clear_bit(AXF_ESCAPE, &ax->flags)) - s = END; - break; - } - - spin_lock_bh(&ax->buflock); - if (!test_bit(AXF_ERROR, &ax->flags)) { - if (ax->rcount < ax->buffsize) { - ax->rbuff[ax->rcount++] = s; - spin_unlock_bh(&ax->buflock); - return; } - ax->rx_over_errors++; - set_bit(AXF_ERROR, &ax->flags); + spin_lock_irq(&dev->xmit_lock); + memcpy(dev->dev_addr, addr, AX25_ADDR_LEN); + spin_unlock_irq(&dev->xmit_lock); + + err = 0; + break; + } + default: + err = -ENOIOCTLCMD; } - spin_unlock_bh(&ax->buflock); -} + mkiss_put(ax); -static int ax_set_mac_address(struct net_device *dev, void __user *addr) -{ - if (copy_from_user(dev->dev_addr, addr, AX25_ADDR_LEN)) - return -EFAULT; - return 0; + return err; } -static int ax_set_dev_mac_address(struct net_device *dev, void *addr) +/* + * Handle the 'receiver data ready' interrupt. + * This function is called by the 'tty_io' module in the kernel when + * a block of data has been received, which can now be decapsulated + * and sent on to the AX.25 layer for further processing. + */ +static void mkiss_receive_buf(struct tty_struct *tty, const unsigned char *cp, + char *fp, int count) { - struct sockaddr *sa = addr; - - memcpy(dev->dev_addr, sa->sa_data, AX25_ADDR_LEN); + struct mkiss *ax = mkiss_get(tty); - return 0; -} - - -/* Perform I/O control on an active ax25 channel. */ -static int ax25_disp_ioctl(struct tty_struct *tty, void *file, int cmd, void __user *arg) -{ - struct ax_disp *ax = (struct ax_disp *) tty->disc_data; - unsigned int tmp; + if (!ax) + return; - /* First make sure we're connected. */ - if (ax == NULL || ax->magic != AX25_MAGIC) - return -EINVAL; + /* + * Argh! mtu change time! - costs us the packet part received + * at the change + */ + if (ax->mtu != ax->dev->mtu + 73) + ax_changedmtu(ax); - switch (cmd) { - case SIOCGIFNAME: - if (copy_to_user(arg, ax->dev->name, strlen(ax->dev->name) + 1)) - return -EFAULT; - return 0; - - case SIOCGIFENCAP: - return put_user(4, (int __user *)arg); - - case SIOCSIFENCAP: - if (get_user(tmp, (int __user *)arg)) - return -EFAULT; - ax->mode = tmp; - ax->dev->addr_len = AX25_ADDR_LEN; /* sizeof an AX.25 addr */ - ax->dev->hard_header_len = AX25_KISS_HEADER_LEN + AX25_MAX_HEADER_LEN + 3; - ax->dev->type = ARPHRD_AX25; - return 0; - - case SIOCSIFHWADDR: - return ax_set_mac_address(ax->dev, arg); + /* Read the characters out of the buffer */ + while (count--) { + if (fp != NULL && *fp++) { + if (!test_and_set_bit(AXF_ERROR, &ax->flags)) + ax->stats.rx_errors++; + cp++; + continue; + } - default: - return -ENOIOCTLCMD; + kiss_unesc(ax, *cp++); } + + mkiss_put(ax); + if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) + && tty->driver->unthrottle) + tty->driver->unthrottle(tty); } -static int ax_open_dev(struct net_device *dev) +static int mkiss_receive_room(struct tty_struct *tty) { - struct ax_disp *ax = netdev_priv(dev); - - if (ax->tty == NULL) - return -ENODEV; - - return 0; + return 65536; /* We can handle an infinite amount of data. :-) */ } - -/* Initialize the driver. Called by network startup. */ -static int ax25_init(struct net_device *dev) +/* + * Called by the driver when there's room for more data. If we have + * more packets to send, we send them here. + */ +static void mkiss_write_wakeup(struct tty_struct *tty) { - struct ax_disp *ax = netdev_priv(dev); - - static char ax25_bcast[AX25_ADDR_LEN] = - {'Q'<<1,'S'<<1,'T'<<1,' '<<1,' '<<1,' '<<1,'0'<<1}; - static char ax25_test[AX25_ADDR_LEN] = - {'L'<<1,'I'<<1,'N'<<1,'U'<<1,'X'<<1,' '<<1,'1'<<1}; - - if (ax == NULL) /* Allocation failed ?? */ - return -ENODEV; + struct mkiss *ax = mkiss_get(tty); + int actual; - /* Set up the "AX25 Control Block". (And clear statistics) */ - memset(ax, 0, sizeof (struct ax_disp)); - ax->magic = AX25_MAGIC; - ax->dev = dev; + if (!ax) + return; - /* Finish setting up the DEVICE info. */ - dev->mtu = AX_MTU; - dev->hard_start_xmit = ax_xmit; - dev->open = ax_open_dev; - dev->stop = ax_close; - dev->get_stats = ax_get_stats; - dev->set_mac_address = ax_set_dev_mac_address; - dev->hard_header_len = 0; - dev->addr_len = 0; - dev->type = ARPHRD_AX25; - dev->tx_queue_len = 10; - dev->hard_header = ax_header; - dev->rebuild_header = ax_rebuild_header; + if (ax->xleft <= 0) { + /* Now serial buffer is almost free & we can start + * transmission of another packet + */ + clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); - memcpy(dev->broadcast, ax25_bcast, AX25_ADDR_LEN); - memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN); + netif_wake_queue(ax->dev); + goto out; + } - /* New-style flags. */ - dev->flags = IFF_BROADCAST | IFF_MULTICAST; + actual = tty->driver->write(tty, ax->xhead, ax->xleft); + ax->xleft -= actual; + ax->xhead += actual; - return 0; +out: + mkiss_put(ax); } +static struct tty_ldisc ax_ldisc = { + .magic = TTY_LDISC_MAGIC, + .name = "mkiss", + .open = mkiss_open, + .close = mkiss_close, + .ioctl = mkiss_ioctl, + .receive_buf = mkiss_receive_buf, + .receive_room = mkiss_receive_room, + .write_wakeup = mkiss_write_wakeup +}; -/* ******************************************************************** */ -/* * Init MKISS driver * */ -/* ******************************************************************** */ +static char banner[] __initdata = KERN_INFO \ + "mkiss: AX.25 Multikiss, Hans Albas PE1AYX\n"; +static char msg_regfail[] __initdata = KERN_ERR \ + "mkiss: can't register line discipline (err = %d)\n"; static int __init mkiss_init_driver(void) { @@ -886,64 +885,27 @@ static int __init mkiss_init_driver(void) printk(banner); - if (ax25_maxdev < 4) - ax25_maxdev = 4; /* Sanity */ + if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0) + printk(msg_regfail); - if ((ax25_ctrls = kmalloc(sizeof(void *) * ax25_maxdev, GFP_KERNEL)) == NULL) { - printk(KERN_ERR "mkiss: Can't allocate ax25_ctrls[] array!\n"); - return -ENOMEM; - } - - /* Clear the pointer array, we allocate devices when we need them */ - memset(ax25_ctrls, 0, sizeof(void*) * ax25_maxdev); /* Pointers */ - - /* Fill in our line protocol discipline, and register it */ - ax_ldisc.magic = TTY_LDISC_MAGIC; - ax_ldisc.name = "mkiss"; - ax_ldisc.open = ax25_open; - ax_ldisc.close = ax25_close; - ax_ldisc.ioctl = (int (*)(struct tty_struct *, struct file *, - unsigned int, unsigned long))ax25_disp_ioctl; - ax_ldisc.receive_buf = ax25_receive_buf; - ax_ldisc.receive_room = ax25_receive_room; - ax_ldisc.write_wakeup = ax25_write_wakeup; - - if ((status = tty_register_ldisc(N_AX25, &ax_ldisc)) != 0) { - printk(KERN_ERR "mkiss: can't register line discipline (err = %d)\n", status); - kfree(ax25_ctrls); - } return status; } +static const char msg_unregfail[] __exitdata = KERN_ERR \ + "mkiss: can't unregister line discipline (err = %d)\n"; + static void __exit mkiss_exit_driver(void) { - int i; - - for (i = 0; i < ax25_maxdev; i++) { - if (ax25_ctrls[i]) { - /* - * VSV = if dev->start==0, then device - * unregistered while close proc. - */ - if (netif_running(&ax25_ctrls[i]->dev)) - unregister_netdev(&ax25_ctrls[i]->dev); - kfree(ax25_ctrls[i]); - } - } + int ret; - kfree(ax25_ctrls); - ax25_ctrls = NULL; - - if ((i = tty_unregister_ldisc(N_AX25))) - printk(KERN_ERR "mkiss: can't unregister line discipline (err = %d)\n", i); + if ((ret = tty_unregister_ldisc(N_AX25))) + printk(msg_unregfail, ret); } -MODULE_AUTHOR("Hans Albas PE1AYX <hans@esrac.ele.tue.nl>"); +MODULE_AUTHOR("Ralf Baechle DL5RB <ralf@linux-mips.org>"); MODULE_DESCRIPTION("KISS driver for AX.25 over TTYs"); -MODULE_PARM(ax25_maxdev, "i"); -MODULE_PARM_DESC(ax25_maxdev, "number of MKISS devices"); MODULE_LICENSE("GPL"); MODULE_ALIAS_LDISC(N_AX25); + module_init(mkiss_init_driver); module_exit(mkiss_exit_driver); - |