Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Copyright (c) 2014      Protonic Holland,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *                         David Jander
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2014-2017 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)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/can/dev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/can/rx-offload.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) struct can_rx_offload_cb {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 	u32 timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) static inline struct can_rx_offload_cb *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) can_rx_offload_get_cb(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	BUILD_BUG_ON(sizeof(struct can_rx_offload_cb) > sizeof(skb->cb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	return (struct can_rx_offload_cb *)skb->cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static inline bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) can_rx_offload_le(struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 		  unsigned int a, unsigned int b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	if (offload->inc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		return a <= b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return a >= b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) static inline unsigned int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) can_rx_offload_inc(struct can_rx_offload *offload, unsigned int *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if (offload->inc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		return (*val)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		return (*val)--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) static int can_rx_offload_napi_poll(struct napi_struct *napi, int quota)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	struct can_rx_offload *offload = container_of(napi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 						      struct can_rx_offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 						      napi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct net_device *dev = offload->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct net_device_stats *stats = &dev->stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	int work_done = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	while ((work_done < quota) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	       (skb = skb_dequeue(&offload->skb_queue))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		struct can_frame *cf = (struct can_frame *)skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		work_done++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		stats->rx_packets++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		stats->rx_bytes += cf->can_dlc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		netif_receive_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (work_done < quota) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		napi_complete_done(napi, work_done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		/* Check if there was another interrupt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (!skb_queue_empty(&offload->skb_queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			napi_reschedule(&offload->napi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	can_led_event(offload->dev, CAN_LED_EVENT_RX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return work_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) __skb_queue_add_sort(struct sk_buff_head *head, struct sk_buff *new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		     int (*compare)(struct sk_buff *a, struct sk_buff *b))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	struct sk_buff *pos, *insert = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	skb_queue_reverse_walk(head, pos) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		const struct can_rx_offload_cb *cb_pos, *cb_new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		cb_pos = can_rx_offload_get_cb(pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		cb_new = can_rx_offload_get_cb(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		netdev_dbg(new->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			   "%s: pos=0x%08x, new=0x%08x, diff=%10d, queue_len=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			   __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 			   cb_pos->timestamp, cb_new->timestamp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 			   cb_new->timestamp - cb_pos->timestamp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			   skb_queue_len(head));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		if (compare(pos, new) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		insert = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	if (!insert)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		__skb_queue_head(head, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		__skb_queue_after(head, insert, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static int can_rx_offload_compare(struct sk_buff *a, struct sk_buff *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	const struct can_rx_offload_cb *cb_a, *cb_b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	cb_a = can_rx_offload_get_cb(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	cb_b = can_rx_offload_get_cb(b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	/* Subtract two u32 and return result as int, to keep
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	 * difference steady around the u32 overflow.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return cb_b->timestamp - cb_a->timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)  * can_rx_offload_offload_one() - Read one CAN frame from HW
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)  * @offload: pointer to rx_offload context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)  * @n: number of mailbox to read
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)  * The task of this function is to read a CAN frame from mailbox @n
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  * from the device and return the mailbox's content as a struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  * sk_buff.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * If the struct can_rx_offload::skb_queue exceeds the maximal queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * length (struct can_rx_offload::skb_queue_len_max) or no skb can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * allocated, the mailbox contents is discarded by reading it into an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * overflow buffer. This way the mailbox is marked as free by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * Return: A pointer to skb containing the CAN frame on success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  *         NULL if the mailbox @n is empty.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  *         ERR_PTR() in case of an error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static struct sk_buff *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) can_rx_offload_offload_one(struct can_rx_offload *offload, unsigned int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	struct can_rx_offload_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	bool drop = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	u32 timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	/* If queue is full drop frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (unlikely(skb_queue_len(&offload->skb_queue) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		     offload->skb_queue_len_max))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		drop = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	skb = offload->mailbox_read(offload, n, &timestamp, drop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	/* Mailbox was empty. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (unlikely(!skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	/* There was a problem reading the mailbox, propagate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	 * error value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (unlikely(IS_ERR(skb))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		offload->dev->stats.rx_dropped++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		offload->dev->stats.rx_fifo_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	/* Mailbox was read. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	cb = can_rx_offload_get_cb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	cb->timestamp = timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) int can_rx_offload_irq_offload_timestamp(struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 					 u64 pending)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct sk_buff_head skb_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	__skb_queue_head_init(&skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	for (i = offload->mb_first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	     can_rx_offload_le(offload, i, offload->mb_last);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	     can_rx_offload_inc(offload, &i)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		if (!(pending & BIT_ULL(i)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		skb = can_rx_offload_offload_one(offload, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (IS_ERR_OR_NULL(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		__skb_queue_add_sort(&skb_queue, skb, can_rx_offload_compare);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (!skb_queue_empty(&skb_queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		u32 queue_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		spin_lock_irqsave(&offload->skb_queue.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		skb_queue_splice_tail(&skb_queue, &offload->skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		spin_unlock_irqrestore(&offload->skb_queue.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		queue_len = skb_queue_len(&offload->skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		if (queue_len > offload->skb_queue_len_max / 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			netdev_dbg(offload->dev, "%s: queue_len=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 				   __func__, queue_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		can_rx_offload_schedule(offload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return skb_queue_len(&skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) EXPORT_SYMBOL_GPL(can_rx_offload_irq_offload_timestamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) int can_rx_offload_irq_offload_fifo(struct can_rx_offload *offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	int received = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		skb = can_rx_offload_offload_one(offload, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		if (IS_ERR(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		skb_queue_tail(&offload->skb_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		received++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (received)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		can_rx_offload_schedule(offload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	return received;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) EXPORT_SYMBOL_GPL(can_rx_offload_irq_offload_fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) int can_rx_offload_queue_sorted(struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 				struct sk_buff *skb, u32 timestamp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	struct can_rx_offload_cb *cb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (skb_queue_len(&offload->skb_queue) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	    offload->skb_queue_len_max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	cb = can_rx_offload_get_cb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	cb->timestamp = timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	spin_lock_irqsave(&offload->skb_queue.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	__skb_queue_add_sort(&offload->skb_queue, skb, can_rx_offload_compare);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	spin_unlock_irqrestore(&offload->skb_queue.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	can_rx_offload_schedule(offload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) EXPORT_SYMBOL_GPL(can_rx_offload_queue_sorted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) unsigned int can_rx_offload_get_echo_skb(struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 					 unsigned int idx, u32 timestamp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	struct net_device *dev = offload->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	struct net_device_stats *stats = &dev->stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	u8 len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	skb = __can_get_echo_skb(dev, idx, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	err = can_rx_offload_queue_sorted(offload, skb, timestamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		stats->rx_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		stats->tx_fifo_errors++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) EXPORT_SYMBOL_GPL(can_rx_offload_get_echo_skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int can_rx_offload_queue_tail(struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			      struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	if (skb_queue_len(&offload->skb_queue) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	    offload->skb_queue_len_max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		dev_kfree_skb_any(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		return -ENOBUFS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	skb_queue_tail(&offload->skb_queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	can_rx_offload_schedule(offload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) EXPORT_SYMBOL_GPL(can_rx_offload_queue_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int can_rx_offload_init_queue(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				     struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 				     unsigned int weight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	offload->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	/* Limit queue len to 4x the weight (rounted to next power of two) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	offload->skb_queue_len_max = 2 << fls(weight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	offload->skb_queue_len_max *= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	skb_queue_head_init(&offload->skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	netif_napi_add(dev, &offload->napi, can_rx_offload_napi_poll, weight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	dev_dbg(dev->dev.parent, "%s: skb_queue_len_max=%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		__func__, offload->skb_queue_len_max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) int can_rx_offload_add_timestamp(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 				 struct can_rx_offload *offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	unsigned int weight;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (offload->mb_first > BITS_PER_LONG_LONG ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	    offload->mb_last > BITS_PER_LONG_LONG || !offload->mailbox_read)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (offload->mb_first < offload->mb_last) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		offload->inc = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		weight = offload->mb_last - offload->mb_first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		offload->inc = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		weight = offload->mb_first - offload->mb_last;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	return can_rx_offload_init_queue(dev, offload, weight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) EXPORT_SYMBOL_GPL(can_rx_offload_add_timestamp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int can_rx_offload_add_fifo(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 			    struct can_rx_offload *offload, unsigned int weight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (!offload->mailbox_read)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	return can_rx_offload_init_queue(dev, offload, weight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) EXPORT_SYMBOL_GPL(can_rx_offload_add_fifo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) int can_rx_offload_add_manual(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 			      struct can_rx_offload *offload,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 			      unsigned int weight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	if (offload->mailbox_read)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	return can_rx_offload_init_queue(dev, offload, weight);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) EXPORT_SYMBOL_GPL(can_rx_offload_add_manual);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) void can_rx_offload_enable(struct can_rx_offload *offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	napi_enable(&offload->napi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) EXPORT_SYMBOL_GPL(can_rx_offload_enable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) void can_rx_offload_del(struct can_rx_offload *offload)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	netif_napi_del(&offload->napi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	skb_queue_purge(&offload->skb_queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) EXPORT_SYMBOL_GPL(can_rx_offload_del);