tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2005-2006 Fen Systems Ltd.
4 * Copyright 2006-2013 Solarflare Communications Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation, incorporated herein by reference.
9 */
10
11#ifndef EFX_EFX_H
12#define EFX_EFX_H
13
14#include "net_driver.h"
15#include "filter.h"
16
17int efx_net_open(struct net_device *net_dev);
18int efx_net_stop(struct net_device *net_dev);
19
20/* TX */
21int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
22void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
23void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
24void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
25void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
26netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
27 struct net_device *net_dev);
28netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
29void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
30int efx_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
31 void *type_data);
32unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
33extern unsigned int efx_piobuf_size;
34extern bool efx_separate_tx_channels;
35
36/* RX */
37void efx_set_default_rx_indir_table(struct efx_nic *efx,
38 struct efx_rss_context *ctx);
39void efx_rx_config_page_split(struct efx_nic *efx);
40int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
41void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
42void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
43void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
44void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
45void efx_rx_slow_fill(struct timer_list *t);
46void __efx_rx_packet(struct efx_channel *channel);
47void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
48 unsigned int n_frags, unsigned int len, u16 flags);
49static inline void efx_rx_flush_packet(struct efx_channel *channel)
50{
51 if (channel->rx_pkt_n_frags)
52 __efx_rx_packet(channel);
53}
54void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
55
56#define EFX_MAX_DMAQ_SIZE 4096UL
57#define EFX_DEFAULT_DMAQ_SIZE 1024UL
58#define EFX_MIN_DMAQ_SIZE 512UL
59
60#define EFX_MAX_EVQ_SIZE 16384UL
61#define EFX_MIN_EVQ_SIZE 512UL
62
63/* Maximum number of TCP segments we support for soft-TSO */
64#define EFX_TSO_MAX_SEGS 100
65
66/* The smallest [rt]xq_entries that the driver supports. RX minimum
67 * is a bit arbitrary. For TX, we must have space for at least 2
68 * TSO skbs.
69 */
70#define EFX_RXQ_MIN_ENT 128U
71#define EFX_TXQ_MIN_ENT(efx) (2 * efx_tx_max_skb_descs(efx))
72
73/* All EF10 architecture NICs steal one bit of the DMAQ size for various
74 * other purposes when counting TxQ entries, so we halve the queue size.
75 */
76#define EFX_TXQ_MAX_ENT(efx) (EFX_WORKAROUND_EF10(efx) ? \
77 EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)
78
79static inline bool efx_rss_enabled(struct efx_nic *efx)
80{
81 return efx->rss_spread > 1;
82}
83
84/* Filters */
85
86void efx_mac_reconfigure(struct efx_nic *efx);
87
88/**
89 * efx_filter_insert_filter - add or replace a filter
90 * @efx: NIC in which to insert the filter
91 * @spec: Specification for the filter
92 * @replace_equal: Flag for whether the specified filter may replace an
93 * existing filter with equal priority
94 *
95 * On success, return the filter ID.
96 * On failure, return a negative error code.
97 *
98 * If existing filters have equal match values to the new filter spec,
99 * then the new filter might replace them or the function might fail,
100 * as follows.
101 *
102 * 1. If the existing filters have lower priority, or @replace_equal
103 * is set and they have equal priority, replace them.
104 *
105 * 2. If the existing filters have higher priority, return -%EPERM.
106 *
107 * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
108 * support delivery to multiple recipients, return -%EEXIST.
109 *
110 * This implies that filters for multiple multicast recipients must
111 * all be inserted with the same priority and @replace_equal = %false.
112 */
113static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
114 struct efx_filter_spec *spec,
115 bool replace_equal)
116{
117 return efx->type->filter_insert(efx, spec, replace_equal);
118}
119
120/**
121 * efx_filter_remove_id_safe - remove a filter by ID, carefully
122 * @efx: NIC from which to remove the filter
123 * @priority: Priority of filter, as passed to @efx_filter_insert_filter
124 * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
125 *
126 * This function will range-check @filter_id, so it is safe to call
127 * with a value passed from userland.
128 */
129static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
130 enum efx_filter_priority priority,
131 u32 filter_id)
132{
133 return efx->type->filter_remove_safe(efx, priority, filter_id);
134}
135
136/**
137 * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
138 * @efx: NIC from which to remove the filter
139 * @priority: Priority of filter, as passed to @efx_filter_insert_filter
140 * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
141 * @spec: Buffer in which to store filter specification
142 *
143 * This function will range-check @filter_id, so it is safe to call
144 * with a value passed from userland.
145 */
146static inline int
147efx_filter_get_filter_safe(struct efx_nic *efx,
148 enum efx_filter_priority priority,
149 u32 filter_id, struct efx_filter_spec *spec)
150{
151 return efx->type->filter_get_safe(efx, priority, filter_id, spec);
152}
153
154static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
155 enum efx_filter_priority priority)
156{
157 return efx->type->filter_count_rx_used(efx, priority);
158}
159static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
160{
161 return efx->type->filter_get_rx_id_limit(efx);
162}
163static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
164 enum efx_filter_priority priority,
165 u32 *buf, u32 size)
166{
167 return efx->type->filter_get_rx_ids(efx, priority, buf, size);
168}
169#ifdef CONFIG_RFS_ACCEL
170int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
171 u16 rxq_index, u32 flow_id);
172bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
173static inline void efx_filter_rfs_expire(struct work_struct *data)
174{
175 struct efx_channel *channel = container_of(data, struct efx_channel,
176 filter_work);
177
178 if (channel->rfs_filters_added >= 60 &&
179 __efx_filter_rfs_expire(channel->efx, 100))
180 channel->rfs_filters_added -= 60;
181}
182#define efx_filter_rfs_enabled() 1
183#else
184static inline void efx_filter_rfs_expire(struct work_struct *data) {}
185#define efx_filter_rfs_enabled() 0
186#endif
187bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
188
189bool efx_filter_spec_equal(const struct efx_filter_spec *left,
190 const struct efx_filter_spec *right);
191u32 efx_filter_spec_hash(const struct efx_filter_spec *spec);
192
193#ifdef CONFIG_RFS_ACCEL
194bool efx_rps_check_rule(struct efx_arfs_rule *rule, unsigned int filter_idx,
195 bool *force);
196
197struct efx_arfs_rule *efx_rps_hash_find(struct efx_nic *efx,
198 const struct efx_filter_spec *spec);
199
200/* @new is written to indicate if entry was newly added (true) or if an old
201 * entry was found and returned (false).
202 */
203struct efx_arfs_rule *efx_rps_hash_add(struct efx_nic *efx,
204 const struct efx_filter_spec *spec,
205 bool *new);
206
207void efx_rps_hash_del(struct efx_nic *efx, const struct efx_filter_spec *spec);
208#endif
209
210/* RSS contexts */
211struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx);
212struct efx_rss_context *efx_find_rss_context_entry(struct efx_nic *efx, u32 id);
213void efx_free_rss_context_entry(struct efx_rss_context *ctx);
214static inline bool efx_rss_active(struct efx_rss_context *ctx)
215{
216 return ctx->context_id != EFX_EF10_RSS_CONTEXT_INVALID;
217}
218
219/* Channels */
220int efx_channel_dummy_op_int(struct efx_channel *channel);
221void efx_channel_dummy_op_void(struct efx_channel *channel);
222int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
223
224/* Ports */
225int efx_reconfigure_port(struct efx_nic *efx);
226int __efx_reconfigure_port(struct efx_nic *efx);
227
228/* Ethtool support */
229extern const struct ethtool_ops efx_ethtool_ops;
230
231/* Reset handling */
232int efx_reset(struct efx_nic *efx, enum reset_type method);
233void efx_reset_down(struct efx_nic *efx, enum reset_type method);
234int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
235int efx_try_recovery(struct efx_nic *efx);
236
237/* Global */
238void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
239unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs);
240unsigned int efx_ticks_to_usecs(struct efx_nic *efx, unsigned int ticks);
241int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
242 unsigned int rx_usecs, bool rx_adaptive,
243 bool rx_may_override_tx);
244void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
245 unsigned int *rx_usecs, bool *rx_adaptive);
246void efx_stop_eventq(struct efx_channel *channel);
247void efx_start_eventq(struct efx_channel *channel);
248
249/* Dummy PHY ops for PHY drivers */
250int efx_port_dummy_op_int(struct efx_nic *efx);
251void efx_port_dummy_op_void(struct efx_nic *efx);
252
253/* Update the generic software stats in the passed stats array */
254void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
255
256/* MTD */
257#ifdef CONFIG_SFC_MTD
258int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
259 size_t n_parts, size_t sizeof_part);
260static inline int efx_mtd_probe(struct efx_nic *efx)
261{
262 return efx->type->mtd_probe(efx);
263}
264void efx_mtd_rename(struct efx_nic *efx);
265void efx_mtd_remove(struct efx_nic *efx);
266#else
267static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
268static inline void efx_mtd_rename(struct efx_nic *efx) {}
269static inline void efx_mtd_remove(struct efx_nic *efx) {}
270#endif
271
272#ifdef CONFIG_SFC_SRIOV
273static inline unsigned int efx_vf_size(struct efx_nic *efx)
274{
275 return 1 << efx->vi_scale;
276}
277#endif
278
279static inline void efx_schedule_channel(struct efx_channel *channel)
280{
281 netif_vdbg(channel->efx, intr, channel->efx->net_dev,
282 "channel %d scheduling NAPI poll on CPU%d\n",
283 channel->channel, raw_smp_processor_id());
284
285 napi_schedule(&channel->napi_str);
286}
287
288static inline void efx_schedule_channel_irq(struct efx_channel *channel)
289{
290 channel->event_test_cpu = raw_smp_processor_id();
291 efx_schedule_channel(channel);
292}
293
294void efx_link_status_changed(struct efx_nic *efx);
295void efx_link_set_advertising(struct efx_nic *efx,
296 const unsigned long *advertising);
297void efx_link_clear_advertising(struct efx_nic *efx);
298void efx_link_set_wanted_fc(struct efx_nic *efx, u8);
299
300static inline void efx_device_detach_sync(struct efx_nic *efx)
301{
302 struct net_device *dev = efx->net_dev;
303
304 /* Lock/freeze all TX queues so that we can be sure the
305 * TX scheduler is stopped when we're done and before
306 * netif_device_present() becomes false.
307 */
308 netif_tx_lock_bh(dev);
309 netif_device_detach(dev);
310 netif_tx_unlock_bh(dev);
311}
312
313static inline void efx_device_attach_if_not_resetting(struct efx_nic *efx)
314{
315 if ((efx->state != STATE_DISABLED) && !efx->reset_pending)
316 netif_device_attach(efx->net_dev);
317}
318
319static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem)
320{
321 if (WARN_ON(down_read_trylock(sem))) {
322 up_read(sem);
323 return false;
324 }
325 return true;
326}
327
328#endif /* EFX_EFX_H */