summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/sfc/nic_common.h
blob: 466df5348b29f4546d0c3c4cfece2e9253a88d09 (plain)
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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/* SPDX-License-Identifier: GPL-2.0-only */
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2005-2006 Fen Systems Ltd.
 * Copyright 2006-2013 Solarflare Communications Inc.
 * Copyright 2019-2020 Xilinx Inc.
 */

#ifndef EFX_NIC_COMMON_H
#define EFX_NIC_COMMON_H

#include "net_driver.h"
#include "efx_common.h"
#include "mcdi.h"
#include "ptp.h"

enum {
	/* Revisions 0-3 were Falcon A0, A1, B0 and Siena respectively.
	 * They are not supported by this driver but these revision numbers
	 * form part of the ethtool API for register dumping.
	 */
	EFX_REV_HUNT_A0 = 4,
	EFX_REV_EF100 = 5,
};

static inline int efx_nic_rev(struct efx_nic *efx)
{
	return efx->type->revision;
}

/* Read the current event from the event queue */
static inline efx_qword_t *efx_event(struct efx_channel *channel,
				     unsigned int index)
{
	return ((efx_qword_t *)(channel->eventq.addr)) +
		(index & channel->eventq_mask);
}

/* See if an event is present
 *
 * We check both the high and low dword of the event for all ones.  We
 * wrote all ones when we cleared the event, and no valid event can
 * have all ones in either its high or low dwords.  This approach is
 * robust against reordering.
 *
 * Note that using a single 64-bit comparison is incorrect; even
 * though the CPU read will be atomic, the DMA write may not be.
 */
static inline int efx_event_present(efx_qword_t *event)
{
	return !(EFX_DWORD_IS_ALL_ONES(event->dword[0]) |
		  EFX_DWORD_IS_ALL_ONES(event->dword[1]));
}

/* Returns a pointer to the specified transmit descriptor in the TX
 * descriptor queue belonging to the specified channel.
 */
static inline efx_qword_t *
efx_tx_desc(struct efx_tx_queue *tx_queue, unsigned int index)
{
	return ((efx_qword_t *)(tx_queue->txd.addr)) + index;
}

/* Report whether this TX queue would be empty for the given write_count.
 * May return false negative.
 */
static inline bool efx_nic_tx_is_empty(struct efx_tx_queue *tx_queue, unsigned int write_count)
{
	unsigned int empty_read_count = READ_ONCE(tx_queue->empty_read_count);

	if (empty_read_count == 0)
		return false;

	return ((empty_read_count ^ write_count) & ~EFX_EMPTY_COUNT_VALID) == 0;
}

int efx_enqueue_skb_tso(struct efx_tx_queue *tx_queue, struct sk_buff *skb,
			bool *data_mapped);

/* Decide whether to push a TX descriptor to the NIC vs merely writing
 * the doorbell.  This can reduce latency when we are adding a single
 * descriptor to an empty queue, but is otherwise pointless.
 * We use the write_count used for the last doorbell push, to get the
 * NIC's view of the tx queue.
 */
static inline bool efx_nic_may_push_tx_desc(struct efx_tx_queue *tx_queue,
					    unsigned int write_count)
{
	bool was_empty = efx_nic_tx_is_empty(tx_queue, write_count);

	tx_queue->empty_read_count = 0;
	return was_empty && tx_queue->write_count - write_count == 1;
}

/* Returns a pointer to the specified descriptor in the RX descriptor queue */
static inline efx_qword_t *
efx_rx_desc(struct efx_rx_queue *rx_queue, unsigned int index)
{
	return ((efx_qword_t *)(rx_queue->rxd.addr)) + index;
}

/* Alignment of PCIe DMA boundaries (4KB) */
#define EFX_PAGE_SIZE	4096
/* Size and alignment of buffer table entries (same) */
#define EFX_BUF_SIZE	EFX_PAGE_SIZE

/* NIC-generic software stats */
enum {
	GENERIC_STAT_rx_noskb_drops,
	GENERIC_STAT_rx_nodesc_trunc,
	GENERIC_STAT_COUNT
};

#define EFX_GENERIC_SW_STAT(ext_name)				\
	[GENERIC_STAT_ ## ext_name] = { #ext_name, 0, 0 }

/* TX data path */
static inline int efx_nic_probe_tx(struct efx_tx_queue *tx_queue)
{
	return tx_queue->efx->type->tx_probe(tx_queue);
}
static inline void efx_nic_init_tx(struct efx_tx_queue *tx_queue)
{
	tx_queue->efx->type->tx_init(tx_queue);
}
static inline void efx_nic_remove_tx(struct efx_tx_queue *tx_queue)
{
	if (tx_queue->efx->type->tx_remove)
		tx_queue->efx->type->tx_remove(tx_queue);
}
static inline void efx_nic_push_buffers(struct efx_tx_queue *tx_queue)
{
	tx_queue->efx->type->tx_write(tx_queue);
}

/* RX data path */
static inline int efx_nic_probe_rx(struct efx_rx_queue *rx_queue)
{
	return rx_queue->efx->type->rx_probe(rx_queue);
}
static inline void efx_nic_init_rx(struct efx_rx_queue *rx_queue)
{
	rx_queue->efx->type->rx_init(rx_queue);
}
static inline void efx_nic_remove_rx(struct efx_rx_queue *rx_queue)
{
	rx_queue->efx->type->rx_remove(rx_queue);
}
static inline void efx_nic_notify_rx_desc(struct efx_rx_queue *rx_queue)
{
	rx_queue->efx->type->rx_write(rx_queue);
}
static inline void efx_nic_generate_fill_event(struct efx_rx_queue *rx_queue)
{
	rx_queue->efx->type->rx_defer_refill(rx_queue);
}

/* Event data path */
static inline int efx_nic_probe_eventq(struct efx_channel *channel)
{
	return channel->efx->type->ev_probe(channel);
}
static inline int efx_nic_init_eventq(struct efx_channel *channel)
{
	return channel->efx->type->ev_init(channel);
}
static inline void efx_nic_fini_eventq(struct efx_channel *channel)
{
	channel->efx->type->ev_fini(channel);
}
static inline void efx_nic_remove_eventq(struct efx_channel *channel)
{
	channel->efx->type->ev_remove(channel);
}
static inline int
efx_nic_process_eventq(struct efx_channel *channel, int quota)
{
	return channel->efx->type->ev_process(channel, quota);
}
static inline void efx_nic_eventq_read_ack(struct efx_channel *channel)
{
	channel->efx->type->ev_read_ack(channel);
}

void efx_nic_event_test_start(struct efx_channel *channel);

bool efx_nic_event_present(struct efx_channel *channel);

static inline void efx_sensor_event(struct efx_nic *efx, efx_qword_t *ev)
{
	if (efx->type->sensor_event)
		efx->type->sensor_event(efx, ev);
}

static inline unsigned int efx_rx_recycle_ring_size(const struct efx_nic *efx)
{
	return efx->type->rx_recycle_ring_size(efx);
}

/* Some statistics are computed as A - B where A and B each increase
 * linearly with some hardware counter(s) and the counters are read
 * asynchronously.  If the counters contributing to B are always read
 * after those contributing to A, the computed value may be lower than
 * the true value by some variable amount, and may decrease between
 * subsequent computations.
 *
 * We should never allow statistics to decrease or to exceed the true
 * value.  Since the computed value will never be greater than the
 * true value, we can achieve this by only storing the computed value
 * when it increases.
 */
static inline void efx_update_diff_stat(u64 *stat, u64 diff)
{
	if ((s64)(diff - *stat) > 0)
		*stat = diff;
}

/* Interrupts */
int efx_nic_init_interrupt(struct efx_nic *efx);
int efx_nic_irq_test_start(struct efx_nic *efx);
void efx_nic_fini_interrupt(struct efx_nic *efx);

static inline int efx_nic_event_test_irq_cpu(struct efx_channel *channel)
{
	return READ_ONCE(channel->event_test_cpu);
}
static inline int efx_nic_irq_test_irq_cpu(struct efx_nic *efx)
{
	return READ_ONCE(efx->last_irq_cpu);
}

/* Global Resources */
int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
			 unsigned int len, gfp_t gfp_flags);
void efx_nic_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer);

size_t efx_nic_get_regs_len(struct efx_nic *efx);
void efx_nic_get_regs(struct efx_nic *efx, void *buf);

#define EFX_MC_STATS_GENERATION_INVALID ((__force __le64)(-1))

size_t efx_nic_describe_stats(const struct efx_hw_stat_desc *desc, size_t count,
			      const unsigned long *mask, u8 *names);
int efx_nic_copy_stats(struct efx_nic *efx, __le64 *dest);
void efx_nic_update_stats(const struct efx_hw_stat_desc *desc, size_t count,
			  const unsigned long *mask, u64 *stats,
			  const void *dma_buf, bool accumulate);
void efx_nic_fix_nodesc_drop_stat(struct efx_nic *efx, u64 *stat);
static inline size_t efx_nic_update_stats_atomic(struct efx_nic *efx, u64 *full_stats,
						 struct rtnl_link_stats64 *core_stats)
{
	if (efx->type->update_stats_atomic)
		return efx->type->update_stats_atomic(efx, full_stats, core_stats);
	return efx->type->update_stats(efx, full_stats, core_stats);
}

#define EFX_MAX_FLUSH_TIME 5000

#endif /* EFX_NIC_COMMON_H */