Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) // Copyright (c) 2010-2011 EIA Electronics,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) //                         Kurt Van Dijck <kurt.van.dijck@eia.be>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) // Copyright (c) 2017-2019 Pengutronix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) //                         Marc Kleine-Budde <kernel@pengutronix.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) // Copyright (c) 2017-2019 Pengutronix,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) //                         Oleksij Rempel <kernel@pengutronix.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) /* bus for j1939 remote devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * Since rtnetlink, no real bus is used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <net/sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "j1939-priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static void __j1939_ecu_release(struct kref *kref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	struct j1939_ecu *ecu = container_of(kref, struct j1939_ecu, kref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	struct j1939_priv *priv = ecu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	list_del(&ecu->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	kfree(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	j1939_priv_put(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) void j1939_ecu_put(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	kref_put(&ecu->kref, __j1939_ecu_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) static void j1939_ecu_get(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	kref_get(&ecu->kref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static bool j1939_ecu_is_mapped_locked(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct j1939_priv *priv = ecu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return j1939_ecu_find_by_addr_locked(priv, ecu->addr) == ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) /* ECU device interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) /* map ECU to a bus address space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static void j1939_ecu_map_locked(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct j1939_priv *priv = ecu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct j1939_addr_ent *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (!j1939_address_is_unicast(ecu->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	ent = &priv->ents[ecu->addr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (ent->ecu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		netdev_warn(priv->ndev, "Trying to map already mapped ECU, addr: 0x%02x, name: 0x%016llx. Skip it.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			    ecu->addr, ecu->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	j1939_ecu_get(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	ent->ecu = ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	ent->nusers += ecu->nusers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /* unmap ECU from a bus address space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) void j1939_ecu_unmap_locked(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	struct j1939_priv *priv = ecu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	struct j1939_addr_ent *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (!j1939_address_is_unicast(ecu->addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (!j1939_ecu_is_mapped_locked(ecu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ent = &priv->ents[ecu->addr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ent->ecu = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	ent->nusers -= ecu->nusers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	j1939_ecu_put(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) void j1939_ecu_unmap(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	write_lock_bh(&ecu->priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	j1939_ecu_unmap_locked(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	write_unlock_bh(&ecu->priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) void j1939_ecu_unmap_all(struct j1939_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	write_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	for (i = 0; i < ARRAY_SIZE(priv->ents); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if (priv->ents[i].ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			j1939_ecu_unmap_locked(priv->ents[i].ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	write_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) void j1939_ecu_timer_start(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	/* The ECU is held here and released in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	 * j1939_ecu_timer_handler() or j1939_ecu_timer_cancel().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	j1939_ecu_get(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	/* Schedule timer in 250 msec to commit address change. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	hrtimer_start(&ecu->ac_timer, ms_to_ktime(250),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		      HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) void j1939_ecu_timer_cancel(struct j1939_ecu *ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (hrtimer_cancel(&ecu->ac_timer))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		j1939_ecu_put(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static enum hrtimer_restart j1939_ecu_timer_handler(struct hrtimer *hrtimer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct j1939_ecu *ecu =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		container_of(hrtimer, struct j1939_ecu, ac_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	struct j1939_priv *priv = ecu->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	write_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	/* TODO: can we test if ecu->addr is unicast before starting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * the timer?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	j1939_ecu_map_locked(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	/* The corresponding j1939_ecu_get() is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	 * j1939_ecu_timer_start().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	j1939_ecu_put(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	write_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	return HRTIMER_NORESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct j1939_ecu *j1939_ecu_create_locked(struct j1939_priv *priv, name_t name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	ecu = kzalloc(sizeof(*ecu), gfp_any());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (!ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	kref_init(&ecu->kref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	ecu->addr = J1939_IDLE_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	ecu->name = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	hrtimer_init(&ecu->ac_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	ecu->ac_timer.function = j1939_ecu_timer_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	INIT_LIST_HEAD(&ecu->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	j1939_priv_get(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ecu->priv = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	list_add_tail(&ecu->list, &priv->ecus);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct j1939_ecu *j1939_ecu_find_by_addr_locked(struct j1939_priv *priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 						u8 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return priv->ents[addr].ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct j1939_ecu *j1939_ecu_get_by_addr_locked(struct j1939_priv *priv, u8 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!j1939_address_is_unicast(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	ecu = j1939_ecu_find_by_addr_locked(priv, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		j1939_ecu_get(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct j1939_ecu *j1939_ecu_get_by_addr(struct j1939_priv *priv, u8 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	read_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	ecu = j1939_ecu_get_by_addr_locked(priv, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	read_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) /* get pointer to ecu without increasing ref counter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static struct j1939_ecu *j1939_ecu_find_by_name_locked(struct j1939_priv *priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 						       name_t name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	list_for_each_entry(ecu, &priv->ecus, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		if (ecu->name == name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct j1939_ecu *j1939_ecu_get_by_name_locked(struct j1939_priv *priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 					       name_t name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	lockdep_assert_held(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	ecu = j1939_ecu_find_by_name_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		j1939_ecu_get(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) struct j1939_ecu *j1939_ecu_get_by_name(struct j1939_priv *priv, name_t name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	read_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	ecu = j1939_ecu_get_by_name_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	read_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	return ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) u8 j1939_name_to_addr(struct j1939_priv *priv, name_t name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	int addr = J1939_IDLE_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		return J1939_NO_ADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	read_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	ecu = j1939_ecu_find_by_name_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (ecu && j1939_ecu_is_mapped_locked(ecu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		/* ecu's SA is registered */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		addr = ecu->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	read_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	return addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* TX addr/name accounting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * Transport protocol needs to know if a SA is local or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * These functions originate from userspace manipulating sockets,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  * so locking is straigforward
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int j1939_local_ecu_get(struct j1939_priv *priv, name_t name, u8 sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	write_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (j1939_address_is_unicast(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		priv->ents[sa].nusers++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	ecu = j1939_ecu_get_by_name_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (!ecu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		ecu = j1939_ecu_create_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	err = PTR_ERR_OR_ZERO(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	ecu->nusers++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	/* TODO: do we care if ecu->addr != sa? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (j1939_ecu_is_mapped_locked(ecu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		/* ecu's sa is active already */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		priv->ents[ecu->addr].nusers++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)  done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	write_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) void j1939_local_ecu_put(struct j1939_priv *priv, name_t name, u8 sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	struct j1939_ecu *ecu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	write_lock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (j1939_address_is_unicast(sa))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		priv->ents[sa].nusers--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	ecu = j1939_ecu_find_by_name_locked(priv, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (WARN_ON_ONCE(!ecu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	ecu->nusers--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* TODO: do we care if ecu->addr != sa? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if (j1939_ecu_is_mapped_locked(ecu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		/* ecu's sa is active already */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		priv->ents[ecu->addr].nusers--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	j1939_ecu_put(ecu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)  done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	write_unlock_bh(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) }