From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- include/net/lapb.h | 162 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 162 insertions(+) create mode 100644 include/net/lapb.h (limited to 'include/net/lapb.h') diff --git a/include/net/lapb.h b/include/net/lapb.h new file mode 100644 index 000000000..6c0742064 --- /dev/null +++ b/include/net/lapb.h @@ -0,0 +1,162 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LAPB_H +#define _LAPB_H +#include +#include + +#define LAPB_HEADER_LEN MAX_HEADER /* LAPB over Ethernet + a bit more */ + +#define LAPB_ACK_PENDING_CONDITION 0x01 +#define LAPB_REJECT_CONDITION 0x02 +#define LAPB_PEER_RX_BUSY_CONDITION 0x04 + +/* Control field templates */ +#define LAPB_I 0x00 /* Information frames */ +#define LAPB_S 0x01 /* Supervisory frames */ +#define LAPB_U 0x03 /* Unnumbered frames */ + +#define LAPB_RR 0x01 /* Receiver ready */ +#define LAPB_RNR 0x05 /* Receiver not ready */ +#define LAPB_REJ 0x09 /* Reject */ + +#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */ +#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */ +#define LAPB_DISC 0x43 /* Disconnect */ +#define LAPB_DM 0x0F /* Disconnected mode */ +#define LAPB_UA 0x63 /* Unnumbered acknowledge */ +#define LAPB_FRMR 0x87 /* Frame reject */ + +#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */ + +#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */ +#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */ + +#define LAPB_FRMR_W 0x01 /* Control field invalid */ +#define LAPB_FRMR_X 0x02 /* I field invalid */ +#define LAPB_FRMR_Y 0x04 /* I field too long */ +#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */ + +#define LAPB_POLLOFF 0 +#define LAPB_POLLON 1 + +/* LAPB C-bit */ +#define LAPB_COMMAND 1 +#define LAPB_RESPONSE 2 + +#define LAPB_ADDR_A 0x03 +#define LAPB_ADDR_B 0x01 +#define LAPB_ADDR_C 0x0F +#define LAPB_ADDR_D 0x07 + +/* Define Link State constants. */ +enum { + LAPB_STATE_0, /* Disconnected State */ + LAPB_STATE_1, /* Awaiting Connection State */ + LAPB_STATE_2, /* Awaiting Disconnection State */ + LAPB_STATE_3, /* Data Transfer State */ + LAPB_STATE_4 /* Frame Reject State */ +}; + +#define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE) +#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */ +#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */ +#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */ +#define LAPB_DEFAULT_N2 20 /* N2=20 */ + +#define LAPB_SMODULUS 8 +#define LAPB_EMODULUS 128 + +/* + * Information about the current frame. + */ +struct lapb_frame { + unsigned short type; /* Parsed type */ + unsigned short nr, ns; /* N(R), N(S) */ + unsigned char cr; /* Command/Response */ + unsigned char pf; /* Poll/Final */ + unsigned char control[2]; /* Original control data*/ +}; + +/* + * The per LAPB connection control structure. + */ +struct lapb_cb { + struct list_head node; + struct net_device *dev; + + /* Link status fields */ + unsigned int mode; + unsigned char state; + unsigned short vs, vr, va; + unsigned char condition; + unsigned short n2, n2count; + unsigned short t1, t2; + struct timer_list t1timer, t2timer; + bool t1timer_running, t2timer_running; + + /* Internal control information */ + struct sk_buff_head write_queue; + struct sk_buff_head ack_queue; + unsigned char window; + const struct lapb_register_struct *callbacks; + + /* FRMR control information */ + struct lapb_frame frmr_data; + unsigned char frmr_type; + + spinlock_t lock; + refcount_t refcnt; +}; + +/* lapb_iface.c */ +void lapb_connect_confirmation(struct lapb_cb *lapb, int); +void lapb_connect_indication(struct lapb_cb *lapb, int); +void lapb_disconnect_confirmation(struct lapb_cb *lapb, int); +void lapb_disconnect_indication(struct lapb_cb *lapb, int); +int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *); +int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *); + +/* lapb_in.c */ +void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *); + +/* lapb_out.c */ +void lapb_kick(struct lapb_cb *lapb); +void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int); +void lapb_establish_data_link(struct lapb_cb *lapb); +void lapb_enquiry_response(struct lapb_cb *lapb); +void lapb_timeout_response(struct lapb_cb *lapb); +void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short); +void lapb_check_need_response(struct lapb_cb *lapb, int, int); + +/* lapb_subr.c */ +void lapb_clear_queues(struct lapb_cb *lapb); +void lapb_frames_acked(struct lapb_cb *lapb, unsigned short); +void lapb_requeue_frames(struct lapb_cb *lapb); +int lapb_validate_nr(struct lapb_cb *lapb, unsigned short); +int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *); +void lapb_send_control(struct lapb_cb *lapb, int, int, int); +void lapb_transmit_frmr(struct lapb_cb *lapb); + +/* lapb_timer.c */ +void lapb_start_t1timer(struct lapb_cb *lapb); +void lapb_start_t2timer(struct lapb_cb *lapb); +void lapb_stop_t1timer(struct lapb_cb *lapb); +void lapb_stop_t2timer(struct lapb_cb *lapb); +int lapb_t1timer_running(struct lapb_cb *lapb); + +/* + * Debug levels. + * 0 = Off + * 1 = State Changes + * 2 = Packets I/O and State Changes + * 3 = Hex dumps, Packets I/O and State Changes. + */ +#define LAPB_DEBUG 0 + +#define lapb_dbg(level, fmt, ...) \ +do { \ + if (level < LAPB_DEBUG) \ + pr_debug(fmt, ##__VA_ARGS__); \ +} while (0) + +#endif -- cgit v1.3.1