drivers/net/ethernet/sfc/efx.h

   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
  17 int efx_net_open(struct net_device *net_dev);
  18 int efx_net_stop(struct net_device *net_dev);
  19
  20 /* TX */
  21 int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
  22 void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
  23 void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
  24 void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
  25 void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
  26 netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
  27                                 struct net_device *net_dev);
  28 netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
  29 void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
  30 int efx_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
  31                  void *type_data);
  32 unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
  33 extern unsigned int efx_piobuf_size;
  34 extern bool efx_separate_tx_channels;
  35
  36 /* RX */
  37 void efx_set_default_rx_indir_table(struct efx_nic *efx,
  38                                     struct efx_rss_context *ctx);
  39 void efx_rx_config_page_split(struct efx_nic *efx);
  40 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
  41 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
  42 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
  43 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
  44 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
  45 void efx_rx_slow_fill(struct timer_list *t);
  46 void __efx_rx_packet(struct efx_channel *channel);
  47 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
  48                    unsigned int n_frags, unsigned int len, u16 flags);
  49 static inline void efx_rx_flush_packet(struct efx_channel *channel)
  50 {
  51         if (channel->rx_pkt_n_frags)
  52                 __efx_rx_packet(channel);
  53 }
  54 void 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
  79 static inline bool efx_rss_enabled(struct efx_nic *efx)
  80 {
  81         return efx->rss_spread > 1;
  82 }
  83
  84 /* Filters */
  85
  86 void 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  */
 113 static 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  */
 129 static 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  */
 146 static inline int
 147 efx_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
 154 static 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 }
 159 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 160 {
 161         return efx->type->filter_get_rx_id_limit(efx);
 162 }
 163 static 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
 170 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 171                    u16 rxq_index, u32 flow_id);
 172 bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
 173 static 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
 184 static inline void efx_filter_rfs_expire(struct work_struct *data) {}
 185 #define efx_filter_rfs_enabled() 0
 186 #endif
 187 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
 188
 189 bool efx_filter_spec_equal(const struct efx_filter_spec *left,
 190                            const struct efx_filter_spec *right);
 191 u32 efx_filter_spec_hash(const struct efx_filter_spec *spec);
 192
 193 #ifdef CONFIG_RFS_ACCEL
 194 bool efx_rps_check_rule(struct efx_arfs_rule *rule, unsigned int filter_idx,
 195                         bool *force);
 196
 197 struct 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  */
 203 struct efx_arfs_rule *efx_rps_hash_add(struct efx_nic *efx,
 204                                        const struct efx_filter_spec *spec,
 205                                        bool *new);
 206
 207 void efx_rps_hash_del(struct efx_nic *efx, const struct efx_filter_spec *spec);
 208 #endif
 209
 210 /* RSS contexts */
 211 struct efx_rss_context *efx_alloc_rss_context_entry(struct efx_nic *efx);
 212 struct efx_rss_context *efx_find_rss_context_entry(struct efx_nic *efx, u32 id);
 213 void efx_free_rss_context_entry(struct efx_rss_context *ctx);
 214 static 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 */
 220 int efx_channel_dummy_op_int(struct efx_channel *channel);
 221 void efx_channel_dummy_op_void(struct efx_channel *channel);
 222 int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
 223
 224 /* Ports */
 225 int efx_reconfigure_port(struct efx_nic *efx);
 226 int __efx_reconfigure_port(struct efx_nic *efx);
 227
 228 /* Ethtool support */
 229 extern const struct ethtool_ops efx_ethtool_ops;
 230
 231 /* Reset handling */
 232 int efx_reset(struct efx_nic *efx, enum reset_type method);
 233 void efx_reset_down(struct efx_nic *efx, enum reset_type method);
 234 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
 235 int efx_try_recovery(struct efx_nic *efx);
 236
 237 /* Global */
 238 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
 239 unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs);
 240 unsigned int efx_ticks_to_usecs(struct efx_nic *efx, unsigned int ticks);
 241 int 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);
 244 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 245                             unsigned int *rx_usecs, bool *rx_adaptive);
 246 void efx_stop_eventq(struct efx_channel *channel);
 247 void efx_start_eventq(struct efx_channel *channel);
 248
 249 /* Dummy PHY ops for PHY drivers */
 250 int efx_port_dummy_op_int(struct efx_nic *efx);
 251 void efx_port_dummy_op_void(struct efx_nic *efx);
 252
 253 /* Update the generic software stats in the passed stats array */
 254 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
 255
 256 /* MTD */
 257 #ifdef CONFIG_SFC_MTD
 258 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
 259                 size_t n_parts, size_t sizeof_part);
 260 static inline int efx_mtd_probe(struct efx_nic *efx)
 261 {
 262         return efx->type->mtd_probe(efx);
 263 }
 264 void efx_mtd_rename(struct efx_nic *efx);
 265 void efx_mtd_remove(struct efx_nic *efx);
 266 #else
 267 static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
 268 static inline void efx_mtd_rename(struct efx_nic *efx) {}
 269 static inline void efx_mtd_remove(struct efx_nic *efx) {}
 270 #endif
 271
 272 #ifdef CONFIG_SFC_SRIOV
 273 static inline unsigned int efx_vf_size(struct efx_nic *efx)
 274 {
 275         return 1 << efx->vi_scale;
 276 }
 277 #endif
 278
 279 static 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
 288 static 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
 294 void efx_link_status_changed(struct efx_nic *efx);
 295 void efx_link_set_advertising(struct efx_nic *efx,
 296                               const unsigned long *advertising);
 297 void efx_link_clear_advertising(struct efx_nic *efx);
 298 void efx_link_set_wanted_fc(struct efx_nic *efx, u8);
 299
 300 static 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
 313 static 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
 319 static 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 */