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linux/drivers/s390/net/lcs.h
Klaus D. Wacker 59579da329 lcs: Channel errors drive lcs_recovery which leads to kernel panic. 
When the lcs irq routine detects channel failures it drives device recovery.
After this event the device is no longer usable for shutdown requests,
because the lcs_irq routine may get wrong channel status information.
In such a case the lcs_irq routine marks the channel in 'error' state.
The channel state comes back to 'running' after restarting the channels.

Signed-off-by: Klaus D. Wacker <kdwacker@de.ibm.com>
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-10-10 16:54:41 -07:00

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/*lcs.h*/
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <asm/ccwdev.h>
#define LCS_DBF_TEXT(level, name, text) \
do { \
debug_text_event(lcs_dbf_##name, level, text); \
} while (0)
#define LCS_DBF_HEX(level,name,addr,len) \
do { \
debug_event(lcs_dbf_##name,level,(void*)(addr),len); \
} while (0)
#define LCS_DBF_TEXT_(level,name,text...) \
do { \
sprintf(debug_buffer, text); \
debug_text_event(lcs_dbf_##name,level, debug_buffer);\
} while (0)
/**
* sysfs related stuff
*/
#define CARD_FROM_DEV(cdev) \
(struct lcs_card *) \
((struct ccwgroup_device *)cdev->dev.driver_data)->dev.driver_data;
/**
* CCW commands used in this driver
*/
#define LCS_CCW_WRITE 0x01
#define LCS_CCW_READ 0x02
#define LCS_CCW_TRANSFER 0x08
/**
* LCS device status primitives
*/
#define LCS_CMD_STARTLAN 0x01
#define LCS_CMD_STOPLAN 0x02
#define LCS_CMD_LANSTAT 0x04
#define LCS_CMD_STARTUP 0x07
#define LCS_CMD_SHUTDOWN 0x08
#define LCS_CMD_QIPASSIST 0xb2
#define LCS_CMD_SETIPM 0xb4
#define LCS_CMD_DELIPM 0xb5
#define LCS_INITIATOR_TCPIP 0x00
#define LCS_INITIATOR_LGW 0x01
#define LCS_STD_CMD_SIZE 16
#define LCS_MULTICAST_CMD_SIZE 404
/**
* LCS IPASSIST MASKS,only used when multicast is switched on
*/
/* Not supported by LCS */
#define LCS_IPASS_ARP_PROCESSING 0x0001
#define LCS_IPASS_IN_CHECKSUM_SUPPORT 0x0002
#define LCS_IPASS_OUT_CHECKSUM_SUPPORT 0x0004
#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008
#define LCS_IPASS_IP_FILTERING 0x0010
/* Supported by lcs 3172 */
#define LCS_IPASS_IPV6_SUPPORT 0x0020
#define LCS_IPASS_MULTICAST_SUPPORT 0x0040
/**
* LCS sense byte definitions
*/
#define LCS_SENSE_BYTE_0 0
#define LCS_SENSE_BYTE_1 1
#define LCS_SENSE_BYTE_2 2
#define LCS_SENSE_BYTE_3 3
#define LCS_SENSE_INTERFACE_DISCONNECT 0x01
#define LCS_SENSE_EQUIPMENT_CHECK 0x10
#define LCS_SENSE_BUS_OUT_CHECK 0x20
#define LCS_SENSE_INTERVENTION_REQUIRED 0x40
#define LCS_SENSE_CMD_REJECT 0x80
#define LCS_SENSE_RESETTING_EVENT 0x80
#define LCS_SENSE_DEVICE_ONLINE 0x20
/**
* LCS packet type definitions
*/
#define LCS_FRAME_TYPE_CONTROL 0
#define LCS_FRAME_TYPE_ENET 1
#define LCS_FRAME_TYPE_TR 2
#define LCS_FRAME_TYPE_FDDI 7
#define LCS_FRAME_TYPE_AUTO -1
/**
* some more definitions,we will sort them later
*/
#define LCS_ILLEGAL_OFFSET 0xffff
#define LCS_IOBUFFERSIZE 0x5000
#define LCS_NUM_BUFFS 32 /* needs to be power of 2 */
#define LCS_MAC_LENGTH 6
#define LCS_INVALID_PORT_NO -1
#define LCS_LANCMD_TIMEOUT_DEFAULT 5
/**
* Multicast state
*/
#define LCS_IPM_STATE_SET_REQUIRED 0
#define LCS_IPM_STATE_DEL_REQUIRED 1
#define LCS_IPM_STATE_ON_CARD 2
/**
* LCS IP Assist declarations
* seems to be only used for multicast
*/
#define LCS_IPASS_ARP_PROCESSING 0x0001
#define LCS_IPASS_INBOUND_CSUM_SUPP 0x0002
#define LCS_IPASS_OUTBOUND_CSUM_SUPP 0x0004
#define LCS_IPASS_IP_FRAG_REASSEMBLY 0x0008
#define LCS_IPASS_IP_FILTERING 0x0010
#define LCS_IPASS_IPV6_SUPPORT 0x0020
#define LCS_IPASS_MULTICAST_SUPPORT 0x0040
/**
* LCS Buffer states
*/
enum lcs_buffer_states {
LCS_BUF_STATE_EMPTY, /* buffer is empty */
LCS_BUF_STATE_LOCKED, /* buffer is locked, don't touch */
LCS_BUF_STATE_READY, /* buffer is ready for read/write */
LCS_BUF_STATE_PROCESSED,
};
/**
* LCS Channel State Machine declarations
*/
enum lcs_channel_states {
LCS_CH_STATE_INIT,
LCS_CH_STATE_HALTED,
LCS_CH_STATE_STOPPED,
LCS_CH_STATE_RUNNING,
LCS_CH_STATE_SUSPENDED,
LCS_CH_STATE_CLEARED,
LCS_CH_STATE_ERROR,
};
/**
* LCS device state machine
*/
enum lcs_dev_states {
DEV_STATE_DOWN,
DEV_STATE_UP,
DEV_STATE_RECOVER,
};
enum lcs_threads {
LCS_SET_MC_THREAD = 1,
LCS_RECOVERY_THREAD = 2,
};
/**
* LCS struct declarations
*/
struct lcs_header {
__u16 offset;
__u8 type;
__u8 slot;
} __attribute__ ((packed));
struct lcs_ip_mac_pair {
__be32 ip_addr;
__u8 mac_addr[LCS_MAC_LENGTH];
__u8 reserved[2];
} __attribute__ ((packed));
struct lcs_ipm_list {
struct list_head list;
struct lcs_ip_mac_pair ipm;
__u8 ipm_state;
};
struct lcs_cmd {
__u16 offset;
__u8 type;
__u8 slot;
__u8 cmd_code;
__u8 initiator;
__u16 sequence_no;
__u16 return_code;
union {
struct {
__u8 lan_type;
__u8 portno;
__u16 parameter_count;
__u8 operator_flags[3];
__u8 reserved[3];
} lcs_std_cmd;
struct {
__u16 unused1;
__u16 buff_size;
__u8 unused2[6];
} lcs_startup;
struct {
__u8 lan_type;
__u8 portno;
__u8 unused[10];
__u8 mac_addr[LCS_MAC_LENGTH];
__u32 num_packets_deblocked;
__u32 num_packets_blocked;
__u32 num_packets_tx_on_lan;
__u32 num_tx_errors_detected;
__u32 num_tx_packets_disgarded;
__u32 num_packets_rx_from_lan;
__u32 num_rx_errors_detected;
__u32 num_rx_discarded_nobuffs_avail;
__u32 num_rx_packets_too_large;
} lcs_lanstat_cmd;
#ifdef CONFIG_IP_MULTICAST
struct {
__u8 lan_type;
__u8 portno;
__u16 num_ip_pairs;
__u16 ip_assists_supported;
__u16 ip_assists_enabled;
__u16 version;
struct {
struct lcs_ip_mac_pair
ip_mac_pair[32];
__u32 response_data;
} lcs_ipass_ctlmsg __attribute ((packed));
} lcs_qipassist __attribute__ ((packed));
#endif /*CONFIG_IP_MULTICAST */
} cmd __attribute__ ((packed));
} __attribute__ ((packed));
/**
* Forward declarations.
*/
struct lcs_card;
struct lcs_channel;
/**
* Definition of an lcs buffer.
*/
struct lcs_buffer {
enum lcs_buffer_states state;
void *data;
int count;
/* Callback for completion notification. */
void (*callback)(struct lcs_channel *, struct lcs_buffer *);
};
struct lcs_reply {
struct list_head list;
__u16 sequence_no;
atomic_t refcnt;
/* Callback for completion notification. */
void (*callback)(struct lcs_card *, struct lcs_cmd *);
wait_queue_head_t wait_q;
struct lcs_card *card;
int received;
int rc;
};
/**
* Definition of an lcs channel
*/
struct lcs_channel {
enum lcs_channel_states state;
struct ccw_device *ccwdev;
struct ccw1 ccws[LCS_NUM_BUFFS + 1];
wait_queue_head_t wait_q;
struct tasklet_struct irq_tasklet;
struct lcs_buffer iob[LCS_NUM_BUFFS];
int io_idx;
int buf_idx;
};
/**
* definition of the lcs card
*/
struct lcs_card {
spinlock_t lock;
spinlock_t ipm_lock;
enum lcs_dev_states state;
struct net_device *dev;
struct net_device_stats stats;
__be16 (*lan_type_trans)(struct sk_buff *skb,
struct net_device *dev);
struct ccwgroup_device *gdev;
struct lcs_channel read;
struct lcs_channel write;
struct lcs_buffer *tx_buffer;
int tx_emitted;
struct list_head lancmd_waiters;
int lancmd_timeout;
struct work_struct kernel_thread_starter;
spinlock_t mask_lock;
unsigned long thread_start_mask;
unsigned long thread_running_mask;
unsigned long thread_allowed_mask;
wait_queue_head_t wait_q;
#ifdef CONFIG_IP_MULTICAST
struct list_head ipm_list;
#endif
__u8 mac[LCS_MAC_LENGTH];
__u16 ip_assists_supported;
__u16 ip_assists_enabled;
__s8 lan_type;
__u32 pkt_seq;
__u16 sequence_no;
__s16 portno;
/* Some info copied from probeinfo */
u8 device_forced;
u8 max_port_no;
u8 hint_port_no;
s16 port_protocol_no;
} __attribute__ ((aligned(8)));
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