[PATCH] generic HDLC update

This version fixes:
- missing rtnl_lock()/rtnl_unload() bug on unregister_hdlc_device
- N2, C101: interrupt handler now works under high IRQ load from other
  devices (with previous versions, the IRQ processing for the card could
  sometimes stop after reaching "work limit")

This is production-tested on devices I have access to (N2, C101, PC300,
PCI200SYN).

Documentation/networking/generic-hdlc.txt

-Generic HDLC layer for Linux kernel 2.4/2.5
+Generic HDLC layer
 Krzysztof Halasa <khc@pm.waw.pl>
-May, 2001
+January, 2003
 
 
 Generic HDLC layer currently supports:
-- Frame Relay (ANSI, CCITT and no LMI), with ARP support (no InARP),
-- raw HDLC (IPv4 only),
+- Frame Relay (ANSI, CCITT and no LMI), with ARP support (no InARP).
+  Normal (routed) and Ethernet-bridged (Ethernet device emulation)
+  interfaces can share a single PVC.
+- raw HDLC - either IP (IPv4) interface or Ethernet device emulation.
 - Cisco HDLC,
 - PPP (uses syncppp.c),
 - X.25 (uses X.25 routines).
@@ -15,6 +17,10 @@ There are hardware drivers for the following cards:
 - RISCom/N2 by SDL Communications Inc.
 - and others, some not in the official kernel.
 
+Ethernet device emulation (using HDLC or Frame-Relay PVC) is compatible
+with IEEE 802.1Q (VLANs) and 802.1D (Ethernet bridging).
+
+
 Make sure the hdlc.o and the hardware driver are loaded. It should
 create a number of "hdlc" (hdlc0 etc) network devices, one for each
 WAN port. You'll need the "sethdlc" utility, get it from:
@@ -58,6 +64,9 @@ Setting protocol:
   no-parity / crc16 / crc16-pr0 (CRC16 with preset zeros) / crc32-itu
   crc16-itu (CRC16 with ITU-T polynomial) / crc16-itu-pr0 - sets parity
 
+* hdlc-eth - Ethernet device emulation using HDLC. Parity and encoding
+  as above.
+
 * cisco - sets Cisco HDLC mode (IP, IPv6 and IPX supported)
   interval - time in seconds between keepalive packets
   timeout - time in seconds after last received keepalive packet before
@@ -77,7 +86,12 @@ Setting protocol:
   n392 - error threshold - both user and network
   n393 - monitored events count - both user and network
 
-* create | delete n - FR only - adds / deletes PVC interface with DLCI #n.
+Frame-Relay only:
+* create n | delete n - adds / deletes PVC interface with DLCI #n.
+  Newly created interface will be named pvc0, pvc1 etc.
+
+* create ether n | delete ether n - adds a device for Ethernet-bridged
+  frames. The device will be named pvceth0, pvceth1 etc.
 
 
 
@@ -85,30 +99,30 @@ Setting protocol:
 Board-specific issues
 ---------------------
 
-n2.o and c101.o need parameters to work (note double quotes):
+n2.o and c101.o need parameters to work:
 
-	insmod n2 hw='"io,irq,ram,ports[:io,irq,...]"'
+	insmod n2 hw=io,irq,ram,ports[:io,irq,...]
 example:
-	insmod n2 hw='"0x300,10,0xD0000,01"'
+	insmod n2 hw=0x300,10,0xD0000,01
 
 or
-	insmod c101 hw='"irq,ram[:irq,...]"
+	insmod c101 hw=irq,ram[:irq,...]
 example:
-	insmod c101 hw='"9,0xdc000"'
+	insmod c101 hw=9,0xdc000
 
 If built into the kernel, these drivers need kernel (command line) parameters:
-	n2=io,irq,ram,ports:...
+	n2.hw=io,irq,ram,ports:...
 or
-	c101=irq,ram:...
+	c101.hw=irq,ram:...
 
 
 
 If you have a problem with N2 or C101 card, you can issue the "private"
-command to see port's packet descriptor rings:
+command to see port's packet descriptor rings (in kernel logs):
 
 	sethdlc hdlc0 private
 
-The hardware driver have to be build with CONFIG_HDLC_DEBUG_RINGS.
+The hardware driver has to be build with CONFIG_HDLC_DEBUG_RINGS.
 Attaching this info to bug reports would be helpful. Anyway, let me know
 if you have problems using this.
 

drivers/net/wan/Kconfig

@@ -253,6 +253,11 @@ config HDLC
 	  Generic HDLC driver currently supports raw HDLC, Cisco HDLC, Frame
 	  Relay, synchronous Point-to-Point Protocol (PPP) and X.25.
 
+ 	  If you want to compile the driver as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read Documentation/modules.txt.  The module
+	  will be called hdlc.o.
+
 	  If unsure, say N here.
 
 config HDLC_RAW
@@ -264,6 +269,17 @@ config HDLC_RAW
 
 	  If unsure, say N here.
 
+config HDLC_RAW_ETH
+	bool "Raw HDLC Ethernet device support"
+	depends on HDLC
+	help
+	  Say Y to this option if you want generic HDLC driver to support
+	  raw HDLC Ethernet device emulation over WAN (Wide Area Network)
+	  connections.
+	  You will need it for Ethernet over HDLC bridges.
+
+	  If unsure, say N here.
+
 config HDLC_CISCO
 	bool "Cisco HDLC support"
 	depends on HDLC
@@ -344,6 +360,11 @@ config N2
 
 	  Note that N2csu and N2dds cards are not supported by this driver.
 
+	  If you want to compile the driver as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called n2.o.
+
 	  If unsure, say N here.
 
 config C101
@@ -354,6 +375,11 @@ config C101
 	  Technologies Co., Ltd. If you have such a card,
 	  say Y here and see <http://hq.pm.waw.pl/pub/hdlc/>
 
+	  If you want to compile the driver as a module ( = code which can be
+	  inserted in and removed from the running kernel whenever you want),
+	  say M here and read <file:Documentation/modules.txt>.  The module
+	  will be called c101.o.
+
 	  If unsure, say N here.
 
 config FARSYNC
@@ -377,18 +403,33 @@ config FARSYNC
 config HDLC_DEBUG_PKT
 	bool "Debug received/transmitted packets"
 	depends on HDLC
+	help
+	  This option is for developers only - do NOT use on production
+	  systems.
 
 config HDLC_DEBUG_HARD_HEADER
 	bool "Debug hard_header routines"
 	depends on HDLC
+	help
+	  This option is for developers only - do NOT use on production
+	  systems.
 
 config HDLC_DEBUG_ECN
 	bool "Debug FECN/BECN conditions"
 	depends on HDLC
+	help
+	  This option is for developers only - do NOT use on production
+	  systems.
 
 config HDLC_DEBUG_RINGS
 	bool "Debug RX/TX packet rings"
 	depends on HDLC
+	help
+	  If you answer Y here you will be able to get a diagnostic dump of
+	  port's TX and RX packet rings, using "sethdlc hdlcX private"
+	  command. It does not affect normal operations.
+
+	  If unsure, say Y here.
 
 config DLCI
 	tristate "Frame relay DLCI support"

drivers/net/wan/Makefile

@@ -19,6 +19,7 @@ cyclomx-objs			:= $(cyclomx-y)
 
 hdlc-y				:= hdlc_generic.o
 hdlc-$(CONFIG_HDLC_RAW)		+= hdlc_raw.o
+hdlc-$(CONFIG_HDLC_RAW_ETH)	+= hdlc_raw_eth.o
 hdlc-$(CONFIG_HDLC_CISCO)	+= hdlc_cisco.o
 hdlc-$(CONFIG_HDLC_FR)		+= hdlc_fr.o
 hdlc-$(CONFIG_HDLC_PPP)		+= hdlc_ppp.o

drivers/net/wan/c101.c

 /*
  * Moxa C101 synchronous serial card driver for Linux
  *
- * Copyright (C) 2000-2002 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 2000-2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  *
  * For information see http://hq.pm.waw.pl/hdlc/
  *
@@ -23,6 +22,7 @@
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/init.h>
+#include <linux/moduleparam.h>
 #include <linux/netdevice.h>
 #include <linux/hdlc.h>
 #include <linux/delay.h>
@@ -31,7 +31,7 @@
 #include "hd64570.h"
 
 
-static const char* version = "Moxa C101 driver version: 1.10";
+static const char* version = "Moxa C101 driver version: 1.14";
 static const char* devname = "C101";
 
 #define C101_PAGE 0x1D00
@@ -41,6 +41,10 @@ static const char* devname = "C101";
 #define C101_MAPPED_RAM_SIZE 0x4000
 
 #define RAM_SIZE (256 * 1024)
+#define TX_RING_BUFFERS 10
+#define RX_RING_BUFFERS ((RAM_SIZE - C101_WINDOW_SIZE) /		\
+			 (sizeof(pkt_desc) + HDLC_MAX_MRU) - TX_RING_BUFFERS)
+
 #define CLOCK_BASE 9830400	/* 9.8304 MHz */
 #define PAGE0_ALWAYS_MAPPED
 
@@ -52,20 +56,20 @@ typedef struct card_s {
 	spinlock_t lock;	/* TX lock */
 	u8 *win0base;		/* ISA window base address */
 	u32 phy_winbase;	/* ISA physical base address */
-	u16 buff_offset;	/* offset of first buffer of first channel */
 	sync_serial_settings settings;
+	int rxpart;		/* partial frame received, next frame invalid*/
 	unsigned short encoding;
 	unsigned short parity;
+	u16 rx_ring_buffers;	/* number of buffers in a ring */
+	u16 tx_ring_buffers;
+	u16 buff_offset;	/* offset of first buffer of first channel */
+	u16 rxin;		/* rx ring buffer 'in' pointer */
+	u16 txin;		/* tx ring buffer 'in' and 'last' pointers */
+	u16 txlast;
 	u8 rxs, txs, tmc;	/* SCA registers */
 	u8 irq;			/* IRQ (3-15) */
-	u8 ring_buffers;	/* number of buffers in a ring */
 	u8 page;
 
-	u8 rxin;		/* rx ring buffer 'in' pointer */
-	u8 txin;		/* tx ring buffer 'in' and 'last' pointers */
-	u8 txlast;
-	u8 rxpart;		/* partial frame received, next frame invalid*/
-
 	struct card_s *next_card;
 }card_t;
 
@@ -78,7 +82,12 @@ static card_t **new_card = &first_card;
 #define sca_in(reg, card)	   readb((card)->win0base + C101_SCA + (reg))
 #define sca_out(value, reg, card)  writeb(value, (card)->win0base + C101_SCA + (reg))
 #define sca_inw(reg, card)	   readw((card)->win0base + C101_SCA + (reg))
-#define sca_outw(value, reg, card) writew(value, (card)->win0base + C101_SCA + (reg))
+
+/* EDA address register must be set in EDAL, EDAH order - 8 bit ISA bus */
+#define sca_outw(value, reg, card) do { \
+	writeb(value & 0xFF, (card)->win0base + C101_SCA + (reg)); \
+	writeb((value >> 8 ) & 0xFF, (card)->win0base + C101_SCA + (reg+1));\
+} while(0)
 
 #define port_to_card(port)	   (port)
 #define log_node(port)		   (0)
@@ -146,11 +155,16 @@ static int c101_open(struct net_device *dev)
 {
 	hdlc_device *hdlc = dev_to_hdlc(dev);
 	port_t *port = hdlc_to_port(hdlc);
+
+	if (!try_module_get(THIS_MODULE))
+		return -EFAULT;	/* rmmod in progress */
+
 	int result = hdlc_open(hdlc);
-	if (result)
+	if (result) {
 		return result;
+		module_put(THIS_MODULE);
+	}
 
-	MOD_INC_USE_COUNT;
 	writeb(1, port->win0base + C101_DTR);
 	sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */
 	sca_open(hdlc);
@@ -168,7 +182,7 @@ static int c101_close(struct net_device *dev)
 	writeb(0, port->win0base + C101_DTR);
 	sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port);
 	hdlc_close(hdlc);
-	MOD_DEC_USE_COUNT;
+	module_put(THIS_MODULE);
 	return 0;
 }
 
@@ -229,6 +243,8 @@ static int c101_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 static void c101_destroy_card(card_t *card)
 {
+	readb(card->win0base + C101_PAGE); /* Resets SCA? */
+
 	if (card->irq)
 		free_irq(card->irq, card);
 
@@ -242,7 +258,7 @@ static void c101_destroy_card(card_t *card)
 
 
 
-static int c101_run(unsigned long irq, unsigned long winbase)
+static int __init c101_run(unsigned long irq, unsigned long winbase)
 {
 	struct net_device *dev;
 	card_t *card;
@@ -285,9 +301,10 @@ static int c101_run(unsigned long irq, unsigned long winbase)
 		return -EBUSY;
 	}
 
-	/* 2 rings required for 1 port */
-	card->ring_buffers = (RAM_SIZE -C101_WINDOW_SIZE) / (2 * HDLC_MAX_MRU);
-	printk(KERN_DEBUG "c101: using %u packets rings\n",card->ring_buffers);
+	card->tx_ring_buffers = TX_RING_BUFFERS;
+	card->rx_ring_buffers = RX_RING_BUFFERS;
+	printk(KERN_DEBUG "c101: using %u TX + %u RX packets rings\n",
+	       card->tx_ring_buffers, card->rx_ring_buffers);
 
 	card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
 
@@ -337,7 +354,7 @@ static int __init c101_init(void)
 		return -ENOSYS;	/* no parameters specified, abort */
 	}
 
-	printk(KERN_INFO "%s (SCA-%s)\n", version, sca_version);
+	printk(KERN_INFO "%s\n", version);
 
 	do {
 		unsigned long irq, ram;
@@ -352,7 +369,7 @@ static int __init c101_init(void)
 			c101_run(irq, ram);
 
 		if (*hw == '\x0')
-			return 0;
+			return first_card ? 0 : -ENOSYS;
 	}while(*hw++ == ':');
 
 	printk(KERN_ERR "c101: invalid hardware parameters\n");
@@ -360,17 +377,6 @@ static int __init c101_init(void)
 }
 
 
-#ifndef MODULE
-static int __init c101_setup(char *str)
-{
-	hw = str;
-	return 1;
-}
-
-__setup("c101=", c101_setup);
-#endif
-
-
 static void __exit c101_cleanup(void)
 {
 	card_t *card = first_card;
@@ -389,5 +395,5 @@ module_exit(c101_cleanup);
 
 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 MODULE_DESCRIPTION("Moxa C101 serial port driver");
-MODULE_LICENSE("GPL");
-MODULE_PARM(hw, "s");		/* hw=irq,ram:irq,... */
+MODULE_LICENSE("GPL v2");
+module_param(hw, charp, 0444);	/* hw=irq,ram:irq,... */

drivers/net/wan/dscc4.c

@@ -620,7 +620,7 @@ static inline void dscc4_rx_skb(struct dscc4_dev_priv *dpriv,
 		skb->tail += pkt_len;
 		skb->len = pkt_len;
        	if (netif_running(dev))
-			skb->protocol = htons(ETH_P_HDLC);
+			skb->protocol = hdlc_type_trans(skb, dev);
 		skb->dev->last_rx = jiffies;
 		netif_rx(skb);
 	} else {

drivers/net/wan/farsync.c

@@ -761,7 +761,7 @@ fst_intr_rx ( struct fst_card_info *card, struct fst_port_info *port )
         /* Push upstream */
         skb->mac.raw = skb->data;
         skb->dev = hdlc_to_dev ( &port->hdlc );
-        skb->protocol = htons ( ETH_P_HDLC );
+        skb->protocol = hdlc_type_trans(skb, skb->dev);
         netif_rx ( skb );
 
         port_to_dev ( port )->last_rx = jiffies;

drivers/net/wan/hd6457x.c

 /*
  * Hitachi SCA HD64570 and HD64572 common driver for Linux
  *
- * Copyright (C) 1998-2000 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  *
  * Sources of information:
  *    Hitachi HD64570 SCA User's Manual
  *    Hitachi HD64572 SCA-II User's Manual
+ *
+ * We use the following SCA memory map:
+ *
+ * Packet buffer descriptor rings - starting from winbase or win0base:
+ * rx_ring_buffers * sizeof(pkt_desc) = logical channel #0 RX ring
+ * tx_ring_buffers * sizeof(pkt_desc) = logical channel #0 TX ring
+ * rx_ring_buffers * sizeof(pkt_desc) = logical channel #1 RX ring (if used)
+ * tx_ring_buffers * sizeof(pkt_desc) = logical channel #1 TX ring (if used)
+ *
+ * Packet data buffers - starting from winbase + buff_offset:
+ * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers
+ * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers
+ * rx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 RX buffers (if used)
+ * tx_ring_buffers * HDLC_MAX_MRU     = logical channel #0 TX buffers (if used)
  */
 
 #include <linux/module.h>
@@ -42,8 +55,6 @@
 #error Either hd64570.h or hd64572.h must be included
 #endif
 
-static char sca_version[]="1.09";
-
 #define get_msci(port)	  (phy_node(port) ?   MSCI1_OFFSET :   MSCI0_OFFSET)
 #define get_dmac_rx(port) (phy_node(port) ? DMAC1RX_OFFSET : DMAC0RX_OFFSET)
 #define get_dmac_tx(port) (phy_node(port) ? DMAC1TX_OFFSET : DMAC0TX_OFFSET)
@@ -116,24 +127,35 @@ static inline port_t* dev_to_port(struct net_device *dev)
 
 
 
-static inline u8 next_desc(port_t *port, u8 desc)
+static inline u16 next_desc(port_t *port, u16 desc, int transmit)
+{
+	return (desc + 1) % (transmit ? port_to_card(port)->tx_ring_buffers
+			     : port_to_card(port)->rx_ring_buffers);
+}
+
+
+
+static inline u16 desc_abs_number(port_t *port, u16 desc, int transmit)
 {
-	return (desc + 1) % port_to_card(port)->ring_buffers;
+	u16 rx_buffs = port_to_card(port)->rx_ring_buffers;
+	u16 tx_buffs = port_to_card(port)->tx_ring_buffers;
+
+	desc %= (transmit ? tx_buffs : rx_buffs); // called with "X + 1" etc.
+	return log_node(port) * (rx_buffs + tx_buffs) +
+		transmit * rx_buffs + desc;
 }
 
 
 
-static inline u16 desc_offset(port_t *port, u8 desc, u8 transmit)
+static inline u16 desc_offset(port_t *port, u16 desc, int transmit)
 {
 	/* Descriptor offset always fits in 16 bytes */
-	u8 buffs = port_to_card(port)->ring_buffers;
-	return ((log_node(port) * 2 + transmit) * buffs + (desc % buffs)) *
-		sizeof(pkt_desc);
+	return desc_abs_number(port, desc, transmit) * sizeof(pkt_desc);
 }
 
 
 
-static inline pkt_desc* desc_address(port_t *port, u8 desc, u8 transmit)
+static inline pkt_desc* desc_address(port_t *port, u16 desc, int transmit)
 {
 #ifdef PAGE0_ALWAYS_MAPPED
 	return (pkt_desc*)(win0base(port_to_card(port))
@@ -146,12 +168,10 @@ static inline pkt_desc* desc_address(port_t *port, u8 desc, u8 transmit)
 
 
 
-static inline u32 buffer_offset(port_t *port, u8 desc, u8 transmit)
+static inline u32 buffer_offset(port_t *port, u16 desc, int transmit)
 {
-	u8 buffs = port_to_card(port)->ring_buffers;
 	return port_to_card(port)->buff_offset +
-		((log_node(port) * 2 + transmit) * buffs + (desc % buffs)) *
-		(u32)HDLC_MAX_MRU;
+		desc_abs_number(port, desc, transmit) * (u32)HDLC_MAX_MRU;
 }
 
 
@@ -159,8 +179,7 @@ static inline u32 buffer_offset(port_t *port, u8 desc, u8 transmit)
 static void sca_init_sync_port(port_t *port)
 {
 	card_t *card = port_to_card(port);
-	u8 transmit, i;
-	u16 dmac, buffs = card->ring_buffers;
+	int transmit, i;
 
 	port->rxin = 0;
 	port->txin = 0;
@@ -171,6 +190,10 @@ static void sca_init_sync_port(port_t *port)
 #endif
 
 	for (transmit = 0; transmit < 2; transmit++) {
+		u16 dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
+		u16 buffs = transmit ? card->tx_ring_buffers
+			: card->rx_ring_buffers;
+
 		for (i = 0; i < buffs; i++) {
 			pkt_desc* desc = desc_address(port, i, transmit);
 			u16 chain_off = desc_offset(port, i + 1, transmit);
@@ -182,7 +205,6 @@ static void sca_init_sync_port(port_t *port)
 			writeb(0, &desc->stat);
 		}
 
-		dmac = transmit ? get_dmac_tx(port) : get_dmac_rx(port);
 		/* DMA disable - to halt state */
 		sca_out(0, transmit ? DSR_TX(phy_node(port)) :
 			DSR_RX(phy_node(port)), card);
@@ -247,7 +269,7 @@ static inline void sca_msci_intr(port_t *port)
 
 
 
-static inline void sca_rx(card_t *card, port_t *port, pkt_desc *desc, u8 rxin)
+static inline void sca_rx(card_t *card, port_t *port, pkt_desc *desc, u16 rxin)
 {
 	struct sk_buff *skb;
 	u16 len;
@@ -294,7 +316,7 @@ static inline void sca_rx(card_t *card, port_t *port, pkt_desc *desc, u8 rxin)
 	skb->mac.raw = skb->data;
 	skb->dev = hdlc_to_dev(&port->hdlc);
 	skb->dev->last_rx = jiffies;
-	skb->protocol = htons(ETH_P_HDLC);
+	skb->protocol = hdlc_type_trans(skb, hdlc_to_dev(&port->hdlc));
 	netif_rx(skb);
 }
 
@@ -341,7 +363,7 @@ static inline void sca_rx_intr(port_t *port)
 
 		/* Set new error descriptor address */
 		sca_outa(desc_off, dmac + EDAL, card);
-		port->rxin = next_desc(port, port->rxin);
+		port->rxin = next_desc(port, port->rxin, 0);
 	}
 
 	/* make sure RX DMA is enabled */
@@ -377,8 +399,7 @@ static inline void sca_tx_intr(port_t *port)
 		port->hdlc.stats.tx_packets++;
 		port->hdlc.stats.tx_bytes += readw(&desc->len);
 		writeb(0, &desc->stat);	/* Free descriptor */
-		port->txlast = (port->txlast + 1) %
-			port_to_card(port)->ring_buffers;
+		port->txlast = next_desc(port, port->txlast, 1);
 	}
 
 	netif_wake_queue(hdlc_to_dev(&port->hdlc));
@@ -390,8 +411,6 @@ static inline void sca_tx_intr(port_t *port)
 static void sca_intr(int irq, void* dev_id, struct pt_regs *regs)
 {
 	card_t *card = dev_id;
-/* Maximum events to handle at each interrupt - should I increase it? */
-	int boguscnt = 4;
 	int i;
 	u8 stat;
 
@@ -412,19 +431,9 @@ static void sca_intr(int irq, void* dev_id, struct pt_regs *regs)
 				if (stat & SCA_INTR_DMAC_TX(i))
 					sca_tx_intr(port);
 			}
-
-			if (--boguscnt < 0) {
-#if 0
-				printk(KERN_ERR "%s: too much work at "
-				       "interrupt\n",
-				       hdlc_to_name(&port->hdlc));
-#endif
-				goto exit;
-			}
 		}
 	}
 
- exit:
 #ifndef ALL_PAGES_ALWAYS_MAPPED
 	openwin(card, page);		/* Restore original page */
 #endif
@@ -435,7 +444,7 @@ static void sca_intr(int irq, void* dev_id, struct pt_regs *regs)
 static void sca_set_port(port_t *port)
 {
 	card_t* card = port_to_card(port);
-	u8 msci = get_msci(port);
+	u16 msci = get_msci(port);
 	u8 md2 = sca_in(msci + MD2, card);
 	unsigned int tmc, br = 10, brv = 1024;
 
@@ -495,7 +504,7 @@ static void sca_open(hdlc_device *hdlc)
 {
 	port_t *port = hdlc_to_port(hdlc);
 	card_t* card = port_to_card(port);
-	u8 msci = get_msci(port);
+	u16 msci = get_msci(port);
 	u8 md0, md2;
 
 	switch(port->encoding) {
@@ -639,14 +648,13 @@ static void sca_dump_rings(hdlc_device *hdlc)
 	openwin(card, 0);
 #endif
 
-	printk(KERN_ERR "RX ring: CDA=%u EDA=%u DSR=%02X in=%u "
-	       "%sactive",
+	printk(KERN_ERR "RX ring: CDA=%u EDA=%u DSR=%02X in=%u %sactive",
 	       sca_ina(get_dmac_rx(port) + CDAL, card),
 	       sca_ina(get_dmac_rx(port) + EDAL, card),
 	       sca_in(DSR_RX(phy_node(port)), card),
 	       port->rxin,
 	       sca_in(DSR_RX(phy_node(port)), card) & DSR_DE?"":"in");
-	for (cnt = 0; cnt<port_to_card(port)->ring_buffers; cnt++)
+	for (cnt = 0; cnt < port_to_card(port)->rx_ring_buffers; cnt++)
 		printk(" %02X",
 		       readb(&(desc_address(port, cnt, 0)->stat)));
 
@@ -658,7 +666,7 @@ static void sca_dump_rings(hdlc_device *hdlc)
 	       port->txlast,
 	       sca_in(DSR_TX(phy_node(port)), card) & DSR_DE ? "" : "in");
 
-	for (cnt = 0; cnt<port_to_card(port)->ring_buffers; cnt++)
+	for (cnt = 0; cnt < port_to_card(port)->tx_ring_buffers; cnt++)
 		printk(" %02X",
 		       readb(&(desc_address(port, cnt, 1)->stat)));
 	printk("\n");
@@ -750,7 +758,7 @@ static int sca_xmit(struct sk_buff *skb, struct net_device *dev)
 	writeb(ST_TX_EOM, &desc->stat);
 	dev->trans_start = jiffies;
 
-	port->txin = next_desc(port, port->txin);
+	port->txin = next_desc(port, port->txin, 1);
 	sca_outa(desc_offset(port, port->txin, 1),
 		 get_dmac_tx(port) + EDAL, card);
 
@@ -767,7 +775,49 @@ static int sca_xmit(struct sk_buff *skb, struct net_device *dev)
 }
 
 
-static void sca_init(card_t *card, int wait_states)
+
+#ifdef NEED_DETECT_RAM
+static u32 __devinit sca_detect_ram(card_t *card, u8 *rambase, u32 ramsize)
+{
+	/* Round RAM size to 32 bits, fill from end to start */
+	u32 i = ramsize &= ~3;
+
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+	u32 size = winsize(card);
+
+	openwin(card, (i - 4) / size); /* select last window */
+#endif
+	do {
+		i -= 4;
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+		if ((i + 4) % size == 0)
+			openwin(card, i / size);
+		writel(i ^ 0x12345678, rambase + i % size);
+#else
+		writel(i ^ 0x12345678, rambase + i);
+#endif
+	}while (i > 0);
+
+	for (i = 0; i < ramsize ; i += 4) {
+#ifndef ALL_PAGES_ALWAYS_MAPPED
+		if (i % size == 0)
+			openwin(card, i / size);
+
+		if (readl(rambase + i % size) != (i ^ 0x12345678))
+			break;
+#else
+		if (readl(rambase + i) != (i ^ 0x12345678))
+			break;
+#endif
+	}
+
+	return i;
+}
+#endif /* NEED_DETECT_RAM */
+
+
+
+static void __devinit sca_init(card_t *card, int wait_states)
 {
 	sca_out(wait_states, WCRL, card); /* Wait Control */
 	sca_out(wait_states, WCRM, card);

drivers/net/wan/hdlc_cisco.c

@@ -2,12 +2,11 @@
  * Generic HDLC support routines for Linux
  * Cisco HDLC support
  *
- * Copyright (C) 2000 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 2000 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  */
 
 #include <linux/config.h>
@@ -80,17 +79,43 @@ static void cisco_keepalive_send(hdlc_device *hdlc, u32 type,
 	data->par1 = htonl(par1);
 	data->par2 = htonl(par2);
 	data->rel = 0xFFFF;
-	data->time = htonl(jiffies * 1000 / HZ);
+	/* we will need do_div here if 1000 % HZ != 0 */
+	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
 
 	skb_put(skb, sizeof(cisco_packet));
 	skb->priority = TC_PRIO_CONTROL;
 	skb->dev = hdlc_to_dev(hdlc);
+	skb->nh.raw = skb->data;
 
 	dev_queue_xmit(skb);
 }
 
 
 
+static unsigned short cisco_type_trans(struct sk_buff *skb,
+				       struct net_device *dev)
+{
+	hdlc_header *data = (hdlc_header*)skb->data;
+
+	if (skb->len < sizeof(hdlc_header))
+		return __constant_htons(ETH_P_HDLC);
+
+	if (data->address != CISCO_MULTICAST &&
+	    data->address != CISCO_UNICAST)
+		return __constant_htons(ETH_P_HDLC);
+
+	switch(data->protocol) {
+	case __constant_htons(ETH_P_IP):
+	case __constant_htons(ETH_P_IPX):
+	case __constant_htons(ETH_P_IPV6):
+		skb_pull(skb, sizeof(hdlc_header));
+		return data->protocol;
+	default:
+		return __constant_htons(ETH_P_HDLC);
+	}
+}
+
+
 static void cisco_rx(struct sk_buff *skb)
 {
 	hdlc_device *hdlc = dev_to_hdlc(skb->dev);
@@ -109,14 +134,6 @@ static void cisco_rx(struct sk_buff *skb)
 	skb_pull(skb, sizeof(hdlc_header));
 
 	switch(ntohs(data->protocol)) {
-	case ETH_P_IP:
-	case ETH_P_IPX:
-	case ETH_P_IPV6:
-		skb->protocol = data->protocol;
-		skb->dev = hdlc_to_dev(hdlc);
-		netif_rx(skb);
-		return;
-
 	case CISCO_SYS_INFO:
 		/* Packet is not needed, drop it. */
 		dev_kfree_skb_any(skb);
@@ -288,6 +305,7 @@ int hdlc_cisco_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
 		hdlc->open = cisco_open;
 		hdlc->stop = cisco_close;
 		hdlc->netif_rx = cisco_rx;
+		hdlc->type_trans = cisco_type_trans;
 		hdlc->proto = IF_PROTO_CISCO;
 		dev->hard_start_xmit = hdlc->xmit;
 		dev->hard_header = cisco_hard_header;

drivers/net/wan/hdlc_generic.c

 /*
  * Generic HDLC support routines for Linux
  *
- * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  *
- * Current status:
- *    - this is work in progress
- *    - not heavily tested on SMP
- *    - currently supported:
+ * Currently supported:
  *	* raw IP-in-HDLC
  *	* Cisco HDLC
  *	* Frame Relay with ANSI or CCITT LMI (both user and network side)
@@ -37,7 +33,7 @@
 #include <linux/hdlc.h>
 
 
-static const char* version = "HDLC support module revision 1.11";
+static const char* version = "HDLC support module revision 1.14";
 
 
 static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
@@ -60,7 +56,13 @@ static struct net_device_stats *hdlc_get_stats(struct net_device *dev)
 static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
 		    struct packet_type *p)
 {
-	dev_to_hdlc(dev)->netif_rx(skb);
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	if (hdlc->netif_rx)
+		hdlc->netif_rx(skb);
+	else {
+		hdlc->stats.rx_dropped++; /* Shouldn't happen */
+		dev_kfree_skb(skb);
+	}
 	return 0;
 }
 
@@ -69,6 +71,10 @@ static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
 #define hdlc_raw_ioctl(hdlc, ifr)	-ENOSYS
 #endif
 
+#ifndef CONFIG_HDLC_RAW_ETH
+#define hdlc_raw_eth_ioctl(hdlc, ifr)	-ENOSYS
+#endif
+
 #ifndef CONFIG_HDLC_PPP
 #define hdlc_ppp_ioctl(hdlc, ifr)	-ENOSYS
 #endif
@@ -96,6 +102,7 @@ int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 	switch(ifr->ifr_settings.type) {
 	case IF_PROTO_HDLC:
+	case IF_PROTO_HDLC_ETH:
 	case IF_PROTO_PPP:
 	case IF_PROTO_CISCO:
 	case IF_PROTO_FR:
@@ -109,6 +116,7 @@ int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 	switch(proto) {
 	case IF_PROTO_HDLC:	return hdlc_raw_ioctl(hdlc, ifr);
+	case IF_PROTO_HDLC_ETH:	return hdlc_raw_eth_ioctl(hdlc, ifr);
 	case IF_PROTO_PPP:	return hdlc_ppp_ioctl(hdlc, ifr);
 	case IF_PROTO_CISCO:	return hdlc_cisco_ioctl(hdlc, ifr);
 	case IF_PROTO_FR:	return hdlc_fr_ioctl(hdlc, ifr);
@@ -144,7 +152,6 @@ int register_hdlc_device(hdlc_device *hdlc)
 	if (result != 0)
 		return -EIO;
 
-	MOD_INC_USE_COUNT;
 	return 0;
 }
 
@@ -152,17 +159,17 @@ int register_hdlc_device(hdlc_device *hdlc)
 
 void unregister_hdlc_device(hdlc_device *hdlc)
 {
+	rtnl_lock();
 	hdlc_proto_detach(hdlc);
-
-	unregister_netdev(hdlc_to_dev(hdlc));
-	MOD_DEC_USE_COUNT;
+	unregister_netdevice(hdlc_to_dev(hdlc));
+	rtnl_unlock();
 }
 
 
 
 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 MODULE_DESCRIPTION("HDLC support module");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 
 EXPORT_SYMBOL(hdlc_ioctl);
 EXPORT_SYMBOL(register_hdlc_device);

drivers/net/wan/hdlc_ppp.c

@@ -2,12 +2,11 @@
  * Generic HDLC support routines for Linux
  * Point-to-point protocol support
  *
- * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  */
 
 #include <linux/config.h>
@@ -68,10 +67,10 @@ static void ppp_close(hdlc_device *hdlc)
 
 
 
-static void ppp_rx(struct sk_buff *skb)
+static unsigned short ppp_type_trans(struct sk_buff *skb,
+				     struct net_device *dev)
 {
-	skb->protocol = htons(ETH_P_WAN_PPP);
-	netif_rx(skb);
+	return __constant_htons(ETH_P_WAN_PPP);
 }
 
 
@@ -103,7 +102,8 @@ int hdlc_ppp_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
 
 		hdlc->open = ppp_open;
 		hdlc->stop = ppp_close;
-		hdlc->netif_rx = ppp_rx;
+		hdlc->netif_rx = NULL;
+		hdlc->type_trans = ppp_type_trans;
 		hdlc->proto = IF_PROTO_PPP;
 		dev->hard_start_xmit = hdlc->xmit;
 		dev->hard_header = NULL;

drivers/net/wan/hdlc_raw.c

@@ -2,12 +2,11 @@
  * Generic HDLC support routines for Linux
  * HDLC support
  *
- * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  */
 
 #include <linux/config.h>
@@ -26,10 +25,10 @@
 #include <linux/hdlc.h>
 
 
-static void raw_rx(struct sk_buff *skb)
+static unsigned short raw_type_trans(struct sk_buff *skb,
+				     struct net_device *dev)
 {
-	skb->protocol = htons(ETH_P_IP);
-	netif_rx(skb);
+	return __constant_htons(ETH_P_IP);
 }
 
 
@@ -67,7 +66,7 @@ int hdlc_raw_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
 			new_settings.encoding = ENCODING_NRZ;
 
 		if (new_settings.parity == PARITY_DEFAULT)
-			new_settings.parity = PARITY_NONE;
+			new_settings.parity = PARITY_CRC16_PR1_CCITT;
 
 		result = hdlc->attach(hdlc, new_settings.encoding,
 				      new_settings.parity);
@@ -79,11 +78,13 @@ int hdlc_raw_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
 
 		hdlc->open = NULL;
 		hdlc->stop = NULL;
-		hdlc->netif_rx = raw_rx;
+		hdlc->netif_rx = NULL;
+		hdlc->type_trans = raw_type_trans;
 		hdlc->proto = IF_PROTO_HDLC;
 		dev->hard_start_xmit = hdlc->xmit;
 		dev->hard_header = NULL;
 		dev->type = ARPHRD_RAWHDLC;
+		dev->flags = IFF_POINTOPOINT | IFF_NOARP;
 		dev->addr_len = 0;
 		return 0;
 	}

drivers/net/wan/hdlc_raw_eth.c

+/*
+ * Generic HDLC support routines for Linux
+ * HDLC Ethernet emulation support
+ *
+ * Copyright (C) 2002-2003 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/pkt_sched.h>
+#include <linux/random.h>
+#include <linux/inetdevice.h>
+#include <linux/lapb.h>
+#include <linux/rtnetlink.h>
+#include <linux/etherdevice.h>
+#include <linux/hdlc.h>
+
+
+static int eth_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	int pad = ETH_ZLEN - skb->len;
+	if (pad > 0) {		/* Pad the frame with zeros */
+		int len = skb->len;
+		if (skb_tailroom(skb) < pad)
+			if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
+				dev_to_hdlc(dev)->stats.tx_dropped++;
+				dev_kfree_skb(skb);
+				return 0;
+			}
+		skb_put(skb, pad);
+		memset(skb->data + len, 0, pad);
+	}
+	return dev_to_hdlc(dev)->xmit(skb, dev);
+}
+
+
+int hdlc_raw_eth_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
+{
+	raw_hdlc_proto *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
+	const size_t size = sizeof(raw_hdlc_proto);
+	raw_hdlc_proto new_settings;
+	struct net_device *dev = hdlc_to_dev(hdlc);
+	int result;
+	void *old_ch_mtu;
+	int old_qlen;
+
+	switch (ifr->ifr_settings.type) {
+	case IF_GET_PROTO:
+		ifr->ifr_settings.type = IF_PROTO_HDLC_ETH;
+		if (ifr->ifr_settings.size < size) {
+			ifr->ifr_settings.size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size))
+			return -EFAULT;
+		return 0;
+
+	case IF_PROTO_HDLC_ETH:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+
+		if (copy_from_user(&new_settings, raw_s, size))
+			return -EFAULT;
+
+		if (new_settings.encoding == ENCODING_DEFAULT)
+			new_settings.encoding = ENCODING_NRZ;
+
+		if (new_settings.parity == PARITY_DEFAULT)
+			new_settings.parity = PARITY_CRC16_PR1_CCITT;
+
+		result = hdlc->attach(hdlc, new_settings.encoding,
+				      new_settings.parity);
+		if (result)
+			return result;
+
+		hdlc_proto_detach(hdlc);
+		memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size);
+
+		hdlc->open = NULL;
+		hdlc->stop = NULL;
+		hdlc->netif_rx = NULL;
+		hdlc->type_trans = eth_type_trans;
+		hdlc->proto = IF_PROTO_HDLC_ETH;
+		dev->hard_start_xmit = eth_tx;
+		old_ch_mtu = dev->change_mtu;
+		old_qlen = dev->tx_queue_len;
+		ether_setup(dev);
+		dev->change_mtu = old_ch_mtu;
+		dev->tx_queue_len = old_qlen;
+		memcpy(dev->dev_addr, "\x00\x01", 2);
+                get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
+		return 0;
+	}
+
+	return -EINVAL;
+}

drivers/net/wan/hdlc_x25.c

@@ -2,12 +2,11 @@
  * Generic HDLC support routines for Linux
  * X.25 support
  *
- * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  */
 
 #include <linux/config.h>
@@ -204,6 +203,7 @@ int hdlc_x25_ioctl(hdlc_device *hdlc, struct ifreq *ifr)
 		hdlc->open = x25_open;
 		hdlc->stop = x25_close;
 		hdlc->netif_rx = x25_rx;
+		hdlc->type_trans = NULL;
 		hdlc->proto = IF_PROTO_X25;
 		dev->hard_start_xmit = x25_xmit;
 		dev->hard_header = NULL;

drivers/net/wan/n2.c

 /*
  * SDL Inc. RISCom/N2 synchronous serial card driver for Linux
  *
- * Copyright (C) 1998-2002 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1998-2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  *
  * For information see http://hq.pm.waw.pl/hdlc/
  *
@@ -28,20 +27,28 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
+#include <linux/moduleparam.h>
 #include <linux/netdevice.h>
 #include <linux/hdlc.h>
 #include <asm/io.h>
 #include "hd64570.h"
 
 
-static const char* version = "SDL RISCom/N2 driver version: 1.10";
+static const char* version = "SDL RISCom/N2 driver version: 1.14";
 static const char* devname = "RISCom/N2";
 
 #define USE_WINDOWSIZE 16384
 #define USE_BUS16BITS 1
 #define CLOCK_BASE 9830400	/* 9.8304 MHz */
-
+#define MAX_PAGES      16	/* 16 RAM pages at max */
+#define MAX_RAM_SIZE 0x80000	/* 512 KB */
+#if MAX_RAM_SIZE > MAX_PAGES * USE_WINDOWSIZE
+#undef MAX_RAM_SIZE
+#define MAX_RAM_SIZE (MAX_PAGES * USE_WINDOWSIZE)
+#endif
 #define N2_IOPORTS 0x10
+#define NEED_DETECT_RAM
+#define MAX_TX_BUFFERS 10
 
 static char *hw = NULL;	/* pointer to hw=xxx command line string */
 
@@ -86,16 +93,16 @@ typedef struct port_s {
 	struct card_s *card;
 	spinlock_t lock;	/* TX lock */
 	sync_serial_settings settings;
+	int valid;		/* port enabled */
+	int rxpart;		/* partial frame received, next frame invalid*/
 	unsigned short encoding;
 	unsigned short parity;
+	u16 rxin;		/* rx ring buffer 'in' pointer */
+	u16 txin;		/* tx ring buffer 'in' and 'last' pointers */
+	u16 txlast;
 	u8 rxs, txs, tmc;	/* SCA registers */
-	u8 valid;		/* port enabled */
 	u8 phy_node;		/* physical port # - 0 or 1 */
 	u8 log_node;		/* logical port # */
-	u8 rxin;		/* rx ring buffer 'in' pointer */
-	u8 txin;		/* tx ring buffer 'in' and 'last' pointers */
-	u8 txlast;
-	u8 rxpart;		/* partial frame received, next frame invalid*/
 }port_t;
 
 
@@ -106,8 +113,9 @@ typedef struct card_s {
 	u32 ram_size;		/* number of bytes */
 	u16 io;			/* IO Base address */
 	u16 buff_offset;	/* offset of first buffer of first channel */
+	u16 rx_ring_buffers;	/* number of buffers in a ring */
+	u16 tx_ring_buffers;
 	u8 irq;			/* IRQ (3-15) */
-	u8 ring_buffers;	/* number of buffers in a ring */
 
 	port_t ports[2];
 	struct card_s *next_card;
@@ -209,11 +217,16 @@ static int n2_open(struct net_device *dev)
 	int io = port->card->io;
 	u8 mcr = inb(io + N2_MCR) | (port->phy_node ? TX422_PORT1:TX422_PORT0);
 
+
+	if (!try_module_get(THIS_MODULE))
+		return -EFAULT;	/* rmmod in progress */
+
 	int result = hdlc_open(hdlc);
-	if (result)
+	if (result) {
 		return result;
+		module_put(THIS_MODULE);
+	}
 
-	MOD_INC_USE_COUNT;
 	mcr &= port->phy_node ? ~DTR_PORT1 : ~DTR_PORT0; /* set DTR ON */
 	outb(mcr, io + N2_MCR);
 
@@ -237,7 +250,7 @@ static int n2_close(struct net_device *dev)
 	mcr |= port->phy_node ? DTR_PORT1 : DTR_PORT0; /* set DTR OFF */
 	outb(mcr, io + N2_MCR);
 	hdlc_close(hdlc);
-	MOD_DEC_USE_COUNT;
+	module_put(THIS_MODULE);
 	return 0;
 }
 
@@ -297,62 +310,6 @@ static int n2_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 
 
 
-static u8 n2_count_page(card_t *card)
-{
-	u8 page;
-	int i, bcount = USE_WINDOWSIZE, wcount = USE_WINDOWSIZE/2;
-	u16 *dp = (u16*)card->winbase;
-	u8 *bp = (u8*)card->winbase;
-	u8 psr = inb(card->io + N2_PSR) & PSR_WINBITS;
-
-
-	for (page = 0; page < 16; page++) {
-		outb(psr | page, card->io + N2_PSR); /* select a page */
-		writeb(page, dp);
-		if (readb(dp) != page)
-			break;	/* If can't read back, no good memory */
-
-		outb(psr, card->io + N2_PSR); /* goto page 0 */
-		if (readb(dp))
-			break;	/* If page 0 changed, then wrapped around */
-
-		outb(psr | page, card->io + N2_PSR); /* select page again */
-
-		/*  first do byte tests */
-		for (i = 0; i < bcount; i++)
-			writeb(i, bp + i);
-		for (i = 0; i < bcount; i++)
-			if (readb(bp + i) != (i & 0xff))
-				return 0;
-
-		for (i = 0; i < bcount; i++)
-			writeb(~i, bp + i);
-		for (i = 0; i < bcount; i++)
-			if (readb(bp + i) != (~i & 0xff))
-				return 0;
-
-		/* next do 16-bit tests */
-		for (i = 0; i < wcount; i++)
-			writew(0x55AA, dp + i);
-		for (i = 0; i < wcount; i++)
-			if (readw(dp + i) != 0x55AA)
-				return 0;
-
-		for (i = 0; i < wcount; i++)
-			writew(0xAA55, dp + i);
-		for (i = 0; i < wcount; i++)
-			if (readw(dp + i) != 0xAA55)
-				return 0;
-
-		for (i = 0; i < wcount; i++)
-			writew(page, dp + i);
-	}
-
-	return page;
-}
-
-
-
 static void n2_destroy_card(card_t *card)
 {
 	int cnt;
@@ -376,11 +333,12 @@ static void n2_destroy_card(card_t *card)
 
 
 
-static int n2_run(unsigned long io, unsigned long irq, unsigned long winbase,
-		  long valid0, long valid1)
+static int __init n2_run(unsigned long io, unsigned long irq,
+			 unsigned long winbase, long valid0, long valid1)
 {
 	card_t *card;
 	u8 cnt, pcr;
+	int i;
 
 	if (io < 0x200 || io > 0x3FF || (io % N2_IOPORTS) != 0) {
 		printk(KERN_ERR "n2: invalid I/O port value\n");
@@ -451,25 +409,27 @@ static int n2_run(unsigned long io, unsigned long irq, unsigned long winbase,
 	pcr = PCR_ENWIN | PCR_VPM | (USE_BUS16BITS ? PCR_BUS16 : 0);
 	outb(pcr, io + N2_PCR);
 
-	cnt = n2_count_page(card);
-	if (!cnt) {
-		printk(KERN_ERR "n2: memory test failed.\n");
-		n2_destroy_card(card);
-		return -EIO;
-	}
+	card->ram_size = sca_detect_ram(card, card->winbase, MAX_RAM_SIZE);
 
-	card->ram_size = cnt * USE_WINDOWSIZE;
+	/* number of TX + RX buffers for one port */
+	i = card->ram_size / ((valid0 + valid1) * (sizeof(pkt_desc) +
+						   HDLC_MAX_MRU));
 
-	/* 4 rings required for 2 ports, 2 rings for one port */
-	card->ring_buffers = card->ram_size /
-		((valid0 + valid1) * 2 * (sizeof(pkt_desc) + HDLC_MAX_MRU));
+	card->tx_ring_buffers = min(i / 2, MAX_TX_BUFFERS);
+	card->rx_ring_buffers = i - card->tx_ring_buffers;
 
-	card->buff_offset = (valid0 + valid1) * 2 * (sizeof(pkt_desc))
-		* card->ring_buffers;
+	card->buff_offset = (valid0 + valid1) * sizeof(pkt_desc) *
+		(card->tx_ring_buffers + card->rx_ring_buffers);
 
 	printk(KERN_DEBUG "n2: RISCom/N2 %u KB RAM, IRQ%u, "
-	       "using %u packets rings\n", card->ram_size / 1024, card->irq,
-	       card->ring_buffers);
+	       "using %u TX + %u RX packets rings\n", card->ram_size / 1024,
+	       card->irq, card->tx_ring_buffers, card->rx_ring_buffers);
+
+	if (card->tx_ring_buffers < 1) {
+		printk(KERN_ERR "n2: RAM test failed\n");
+		n2_destroy_card(card);
+		return -EIO;
+	}
 
 	pcr |= PCR_RUNSCA;		/* run SCA */
 	outb(pcr, io + N2_PCR);
@@ -531,7 +491,7 @@ static int __init n2_init(void)
 		return -ENOSYS;	/* no parameters specified, abort */
 	}
 
-	printk(KERN_INFO "%s (SCA-%s)\n", version, sca_version);
+	printk(KERN_INFO "%s\n", version);
 
 	do {
 		unsigned long io, irq, ram;
@@ -566,7 +526,7 @@ static int __init n2_init(void)
 			n2_run(io, irq, ram, valid[0], valid[1]);
 
 		if (*hw == '\x0')
-			return 0;
+			return first_card ? 0 : -ENOSYS;
 	}while(*hw++ == ':');
 
 	printk(KERN_ERR "n2: invalid hardware parameters\n");
@@ -574,17 +534,6 @@ static int __init n2_init(void)
 }
 
 
-#ifndef MODULE
-static int __init n2_setup(char *str)
-{
-	hw = str;
-	return 1;
-}
-
-__setup("n2=", n2_setup);
-#endif
-
-
 static void __exit n2_cleanup(void)
 {
 	card_t *card = first_card;
@@ -602,5 +551,5 @@ module_exit(n2_cleanup);
 
 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
 MODULE_DESCRIPTION("RISCom/N2 serial port driver");
-MODULE_LICENSE("GPL");
-MODULE_PARM(hw, "s");		/* hw=io,irq,ram,ports:io,irq,... */
+MODULE_LICENSE("GPL v2");
+module_param(hw, charp, 0444);	/* hw=io,irq,ram,ports:io,irq,... */

include/linux/hdlc.h

 /*
  * Generic HDLC support routines for Linux
  *
- * Copyright (C) 1999-2002 Krzysztof Halasa <khc@pm.waw.pl>
+ * Copyright (C) 1999-2003 Krzysztof Halasa <khc@pm.waw.pl>
  *
  * This program 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.
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
  */
 
 #ifndef __HDLC_H
@@ -52,7 +51,7 @@
 #include <linux/hdlc/ioctl.h>
 
 #define HDLC_MAX_MTU 1500	/* Ethernet 1500 bytes */
-#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10) /* max 10 bytes for FR */
+#define HDLC_MAX_MRU (HDLC_MAX_MTU + 10 + 14 + 4) /* for ETH+VLAN over FR */
 
 #define MAXLEN_LMISTAT  20	/* max size of status enquiry frame */
 
@@ -145,17 +144,20 @@ typedef struct {
 
 
 typedef struct pvc_device_struct {
-	struct net_device netdev; /* PVC net device - must be first */
-	struct net_device_stats stats;
 	struct hdlc_device_struct *master;
-	struct pvc_device_struct *next;
+	struct net_device *main;
+	struct net_device *ether; /* bridged Ethernet interface */
+	struct pvc_device_struct *next;	/* Sorted in ascending DLCI order */
+	int dlci;
+	int open_count;
 
 	struct {
-		int active;
-		int new;
-		int deleted;
-		int fecn;
-		int becn;
+		unsigned int new: 1;
+		unsigned int active: 1;
+		unsigned int exist: 1;
+		unsigned int deleted: 1;
+		unsigned int fecn: 1;
+		unsigned int becn: 1;
 	}state;
 }pvc_device;
 
@@ -180,18 +182,20 @@ typedef struct hdlc_device_struct {
 	void (*stop)(struct hdlc_device_struct *hdlc);
 	void (*proto_detach)(struct hdlc_device_struct *hdlc);
 	void (*netif_rx)(struct sk_buff *skb);
+	unsigned short (*type_trans)(struct sk_buff *skb,
+				     struct net_device *dev);
 	int proto;		/* IF_PROTO_HDLC/CISCO/FR/etc. */
 
 	union {
 		struct {
 			fr_proto settings;
 			pvc_device *first_pvc;
-			int pvc_count;
+			int dce_pvc_count;
 
 			struct timer_list timer;
 			int last_poll;
 			int reliable;
-			int changed;
+			int dce_changed;
 			int request;
 			int fullrep_sent;
 			u32 last_errors; /* last errors bit list */
@@ -226,6 +230,7 @@ typedef struct hdlc_device_struct {
 
 
 int hdlc_raw_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
+int hdlc_raw_eth_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
 int hdlc_cisco_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
 int hdlc_ppp_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
 int hdlc_fr_ioctl(hdlc_device *hdlc, struct ifreq *ifr);
@@ -254,15 +259,9 @@ static __inline__ hdlc_device* dev_to_hdlc(struct net_device *dev)
 }
 
 
-static __inline__ struct net_device* pvc_to_dev(pvc_device *pvc)
-{
-	return &pvc->netdev;
-}
-
-
 static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
 {
-	return (pvc_device*)dev;
+	return (pvc_device*)dev->priv;
 }
 
 
@@ -272,19 +271,6 @@ static __inline__ const char *hdlc_to_name(hdlc_device *hdlc)
 }
 
 
-static __inline__ const char *pvc_to_name(pvc_device *pvc)
-{
-	return pvc_to_dev(pvc)->name;
-}
-
-
-static __inline__ u16 netdev_dlci(struct net_device *dev)
-{
-	return ntohs(*(u16*)dev->dev_addr);
-}
-
-
-
 static __inline__ u16 q922_to_dlci(u8 *hdr)
 {
 	return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
@@ -345,5 +331,15 @@ static __inline__ void hdlc_proto_detach(hdlc_device *hdlc)
 }
 
 
+static __inline__ unsigned short hdlc_type_trans(struct sk_buff *skb,
+						 struct net_device *dev)
+{
+	hdlc_device *hdlc = dev_to_hdlc(skb->dev);
+	if (hdlc->type_trans)
+		return hdlc->type_trans(skb, dev);
+	else
+		return __constant_htons(ETH_P_HDLC);
+}
+
 #endif /* __KERNEL */
 #endif /* __HDLC_H */

include/linux/hdlc/ioctl.h

@@ -33,6 +33,11 @@ typedef struct {
 	unsigned int dlci;
 } fr_proto_pvc;          /* for creating/deleting FR PVCs */
 
+typedef struct {
+	unsigned int dlci;
+	char master[IFNAMSIZ];	/* Name of master FRAD device */
+}fr_proto_pvc_info;		/* for returning PVC information only */
+
 typedef struct {
     unsigned int interval;
     unsigned int timeout;
@@ -40,16 +45,4 @@ typedef struct {
 
 /* PPP doesn't need any info now - supply length = 0 to ioctl */
 
-union hdlc_settings {
-	raw_hdlc_proto		raw_hdlc;
-	cisco_proto		cisco;
-	fr_proto		fr;
-	fr_proto_pvc		fr_pvc;
-};
-
-union line_settings {
-	sync_serial_settings	sync;
-	te1_settings		te1;
-};
-
 #endif /* __HDLC_IOCTL_H__ */

include/linux/if.h

@@ -21,6 +21,8 @@
 
 #include <linux/types.h>		/* for "__kernel_caddr_t" et al	*/
 #include <linux/socket.h>		/* for "struct sockaddr" et al	*/
+
+#define	IFNAMSIZ	16
 #include <linux/hdlc/ioctl.h>
 
 /* Standard interface flags (netdevice->flags). */
@@ -69,7 +71,11 @@
 #define IF_PROTO_FR_ADD_PVC 0x2004	/*    Create FR PVC		*/
 #define IF_PROTO_FR_DEL_PVC 0x2005	/*    Delete FR PVC		*/
 #define IF_PROTO_X25	0x2006		/* X.25				*/
-
+#define IF_PROTO_HDLC_ETH 0x2007	/* raw HDLC, Ethernet emulation	*/
+#define IF_PROTO_FR_ADD_ETH_PVC 0x2008	/*  Create FR Ethernet-bridged PVC */
+#define IF_PROTO_FR_DEL_ETH_PVC 0x2009	/*  Delete FR Ethernet-bridged PVC */
+#define IF_PROTO_FR_PVC	0x200A		/* for reading PVC status	*/
+#define IF_PROTO_FR_ETH_PVC 0x200B
 
 
 /*
@@ -103,6 +109,7 @@ struct if_settings
 		cisco_proto		*cisco;
 		fr_proto		*fr;
 		fr_proto_pvc		*fr_pvc;
+		fr_proto_pvc_info	*fr_pvc_info;
 
 		/* interface settings */
 		sync_serial_settings	*sync;
@@ -120,7 +127,6 @@ struct if_settings
 struct ifreq 
 {
 #define IFHWADDRLEN	6
-#define	IFNAMSIZ	16
 	union
 	{
 		char	ifrn_name[IFNAMSIZ];		/* if name, e.g. "en0" */