1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2023, 2024 Pengutronix,
// Marc Kleine-Budde <kernel@pengutronix.de>
//
#include <net/netdev_queues.h>
#include "rockchip_canfd.h"
static bool rkcanfd_tx_tail_is_eff(const struct rkcanfd_priv *priv)
{
const struct canfd_frame *cfd;
const struct sk_buff *skb;
unsigned int tx_tail;
if (!rkcanfd_get_tx_pending(priv))
return false;
tx_tail = rkcanfd_get_tx_tail(priv);
skb = priv->can.echo_skb[tx_tail];
if (!skb) {
netdev_err(priv->ndev,
"%s: echo_skb[%u]=NULL tx_head=0x%08x tx_tail=0x%08x\n",
__func__, tx_tail,
priv->tx_head, priv->tx_tail);
return false;
}
cfd = (struct canfd_frame *)skb->data;
return cfd->can_id & CAN_EFF_FLAG;
}
unsigned int rkcanfd_get_effective_tx_free(const struct rkcanfd_priv *priv)
{
if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_6 &&
rkcanfd_tx_tail_is_eff(priv))
return 0;
return rkcanfd_get_tx_free(priv);
}
static void rkcanfd_start_xmit_write_cmd(const struct rkcanfd_priv *priv,
const u32 reg_cmd)
{
if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12)
rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default |
RKCANFD_REG_MODE_SPACE_RX_MODE);
rkcanfd_write(priv, RKCANFD_REG_CMD, reg_cmd);
if (priv->devtype_data.quirks & RKCANFD_QUIRK_RK3568_ERRATUM_12)
rkcanfd_write(priv, RKCANFD_REG_MODE, priv->reg_mode_default);
}
void rkcanfd_xmit_retry(struct rkcanfd_priv *priv)
{
const unsigned int tx_head = rkcanfd_get_tx_head(priv);
const u32 reg_cmd = RKCANFD_REG_CMD_TX_REQ(tx_head);
rkcanfd_start_xmit_write_cmd(priv, reg_cmd);
}
netdev_tx_t rkcanfd_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct rkcanfd_priv *priv = netdev_priv(ndev);
u32 reg_frameinfo, reg_id, reg_cmd;
unsigned int tx_head, frame_len;
const struct canfd_frame *cfd;
int err;
u8 i;
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
if (!netif_subqueue_maybe_stop(priv->ndev, 0,
rkcanfd_get_effective_tx_free(priv),
RKCANFD_TX_STOP_THRESHOLD,
RKCANFD_TX_START_THRESHOLD)) {
if (net_ratelimit())
netdev_info(priv->ndev,
"Stopping tx-queue (tx_head=0x%08x, tx_tail=0x%08x, tx_pending=%d)\n",
priv->tx_head, priv->tx_tail,
rkcanfd_get_tx_pending(priv));
return NETDEV_TX_BUSY;
}
cfd = (struct canfd_frame *)skb->data;
if (cfd->can_id & CAN_EFF_FLAG) {
reg_frameinfo = RKCANFD_REG_FD_FRAMEINFO_FRAME_FORMAT;
reg_id = FIELD_PREP(RKCANFD_REG_FD_ID_EFF, cfd->can_id);
} else {
reg_frameinfo = 0;
reg_id = FIELD_PREP(RKCANFD_REG_FD_ID_SFF, cfd->can_id);
}
if (cfd->can_id & CAN_RTR_FLAG)
reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_RTR;
if (can_is_canfd_skb(skb)) {
reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_FDF;
if (cfd->flags & CANFD_BRS)
reg_frameinfo |= RKCANFD_REG_FD_FRAMEINFO_BRS;
reg_frameinfo |= FIELD_PREP(RKCANFD_REG_FD_FRAMEINFO_DATA_LENGTH,
can_fd_len2dlc(cfd->len));
} else {
reg_frameinfo |= FIELD_PREP(RKCANFD_REG_FD_FRAMEINFO_DATA_LENGTH,
cfd->len);
}
tx_head = rkcanfd_get_tx_head(priv);
reg_cmd = RKCANFD_REG_CMD_TX_REQ(tx_head);
rkcanfd_write(priv, RKCANFD_REG_FD_TXFRAMEINFO, reg_frameinfo);
rkcanfd_write(priv, RKCANFD_REG_FD_TXID, reg_id);
for (i = 0; i < cfd->len; i += 4)
rkcanfd_write(priv, RKCANFD_REG_FD_TXDATA0 + i,
*(u32 *)(cfd->data + i));
frame_len = can_skb_get_frame_len(skb);
err = can_put_echo_skb(skb, ndev, tx_head, frame_len);
if (!err)
netdev_sent_queue(priv->ndev, frame_len);
WRITE_ONCE(priv->tx_head, priv->tx_head + 1);
rkcanfd_start_xmit_write_cmd(priv, reg_cmd);
netif_subqueue_maybe_stop(priv->ndev, 0,
rkcanfd_get_effective_tx_free(priv),
RKCANFD_TX_STOP_THRESHOLD,
RKCANFD_TX_START_THRESHOLD);
return NETDEV_TX_OK;
}
void rkcanfd_handle_tx_done_one(struct rkcanfd_priv *priv, const u32 ts,
unsigned int *frame_len_p)
{
struct net_device_stats *stats = &priv->ndev->stats;
unsigned int tx_tail;
struct sk_buff *skb;
tx_tail = rkcanfd_get_tx_tail(priv);
skb = priv->can.echo_skb[tx_tail];
/* Manual handling of CAN Bus Error counters. See
* rkcanfd_get_corrected_berr_counter() for detailed
* explanation.
*/
if (priv->bec.txerr)
priv->bec.txerr--;
if (skb)
rkcanfd_skb_set_timestamp(priv, skb, ts);
stats->tx_bytes +=
can_rx_offload_get_echo_skb_queue_timestamp(&priv->offload,
tx_tail, ts,
frame_len_p);
stats->tx_packets++;
}
|