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 void efx_rx_config_page_split(struct efx_nic *efx);
  39 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
  40 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
  41 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
  42 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
  43 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
  44 void efx_rx_slow_fill(struct timer_list *t);
  45 void __efx_rx_packet(struct efx_channel *channel);
  46 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
  47                    unsigned int n_frags, unsigned int len, u16 flags);
  48 static inline void efx_rx_flush_packet(struct efx_channel *channel)
  49 {
  50         if (channel->rx_pkt_n_frags)
  51                 __efx_rx_packet(channel);
  52 }
  53 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
  54
  55 #define EFX_MAX_DMAQ_SIZE 4096UL
  56 #define EFX_DEFAULT_DMAQ_SIZE 1024UL
  57 #define EFX_MIN_DMAQ_SIZE 512UL
  58
  59 #define EFX_MAX_EVQ_SIZE 16384UL
  60 #define EFX_MIN_EVQ_SIZE 512UL
  61
  62 /* Maximum number of TCP segments we support for soft-TSO */
  63 #define EFX_TSO_MAX_SEGS        100
  64
  65 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  66  * is a bit arbitrary.  For TX, we must have space for at least 2
  67  * TSO skbs.
  68  */
  69 #define EFX_RXQ_MIN_ENT         128U
  70 #define EFX_TXQ_MIN_ENT(efx)    (2 * efx_tx_max_skb_descs(efx))
  71
  72 /* All EF10 architecture NICs steal one bit of the DMAQ size for various
  73  * other purposes when counting TxQ entries, so we halve the queue size.
  74  */
  75 #define EFX_TXQ_MAX_ENT(efx)    (EFX_WORKAROUND_EF10(efx) ? \
  76                                  EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)
  77
  78 static inline bool efx_rss_enabled(struct efx_nic *efx)
  79 {
  80         return efx->rss_spread > 1;
  81 }
  82
  83 /* Filters */
  84
  85 void efx_mac_reconfigure(struct efx_nic *efx);
  86
  87 /**
  88  * efx_filter_insert_filter - add or replace a filter
  89  * @efx: NIC in which to insert the filter
  90  * @spec: Specification for the filter
  91  * @replace_equal: Flag for whether the specified filter may replace an
  92  *      existing filter with equal priority
  93  *
  94  * On success, return the filter ID.
  95  * On failure, return a negative error code.
  96  *
  97  * If existing filters have equal match values to the new filter spec,
  98  * then the new filter might replace them or the function might fail,
  99  * as follows.
 100  *
 101  * 1. If the existing filters have lower priority, or @replace_equal
 102  *    is set and they have equal priority, replace them.
 103  *
 104  * 2. If the existing filters have higher priority, return -%EPERM.
 105  *
 106  * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
 107  *    support delivery to multiple recipients, return -%EEXIST.
 108  *
 109  * This implies that filters for multiple multicast recipients must
 110  * all be inserted with the same priority and @replace_equal = %false.
 111  */
 112 static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
 113                                            struct efx_filter_spec *spec,
 114                                            bool replace_equal)
 115 {
 116         return efx->type->filter_insert(efx, spec, replace_equal);
 117 }
 118
 119 /**
 120  * efx_filter_remove_id_safe - remove a filter by ID, carefully
 121  * @efx: NIC from which to remove the filter
 122  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 123  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 124  *
 125  * This function will range-check @filter_id, so it is safe to call
 126  * with a value passed from userland.
 127  */
 128 static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
 129                                             enum efx_filter_priority priority,
 130                                             u32 filter_id)
 131 {
 132         return efx->type->filter_remove_safe(efx, priority, filter_id);
 133 }
 134
 135 /**
 136  * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
 137  * @efx: NIC from which to remove the filter
 138  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 139  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 140  * @spec: Buffer in which to store filter specification
 141  *
 142  * This function will range-check @filter_id, so it is safe to call
 143  * with a value passed from userland.
 144  */
 145 static inline int
 146 efx_filter_get_filter_safe(struct efx_nic *efx,
 147                            enum efx_filter_priority priority,
 148                            u32 filter_id, struct efx_filter_spec *spec)
 149 {
 150         return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 151 }
 152
 153 static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
 154                                            enum efx_filter_priority priority)
 155 {
 156         return efx->type->filter_count_rx_used(efx, priority);
 157 }
 158 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 159 {
 160         return efx->type->filter_get_rx_id_limit(efx);
 161 }
 162 static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
 163                                         enum efx_filter_priority priority,
 164                                         u32 *buf, u32 size)
 165 {
 166         return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 167 }
 168 #ifdef CONFIG_RFS_ACCEL
 169 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 170                    u16 rxq_index, u32 flow_id);
 171 bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
 172 static inline void efx_filter_rfs_expire(struct efx_channel *channel)
 173 {
 174         if (channel->rfs_filters_added >= 60 &&
 175             __efx_filter_rfs_expire(channel->efx, 100))
 176                 channel->rfs_filters_added -= 60;
 177 }
 178 #define efx_filter_rfs_enabled() 1
 179 #else
 180 static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
 181 #define efx_filter_rfs_enabled() 0
 182 #endif
 183 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
 184
 185 /* Channels */
 186 int efx_channel_dummy_op_int(struct efx_channel *channel);
 187 void efx_channel_dummy_op_void(struct efx_channel *channel);
 188 int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
 189
 190 /* Ports */
 191 int efx_reconfigure_port(struct efx_nic *efx);
 192 int __efx_reconfigure_port(struct efx_nic *efx);
 193
 194 /* Ethtool support */
 195 extern const struct ethtool_ops efx_ethtool_ops;
 196
 197 /* Reset handling */
 198 int efx_reset(struct efx_nic *efx, enum reset_type method);
 199 void efx_reset_down(struct efx_nic *efx, enum reset_type method);
 200 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
 201 int efx_try_recovery(struct efx_nic *efx);
 202
 203 /* Global */
 204 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
 205 unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs);
 206 unsigned int efx_ticks_to_usecs(struct efx_nic *efx, unsigned int ticks);
 207 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
 208                             unsigned int rx_usecs, bool rx_adaptive,
 209                             bool rx_may_override_tx);
 210 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 211                             unsigned int *rx_usecs, bool *rx_adaptive);
 212 void efx_stop_eventq(struct efx_channel *channel);
 213 void efx_start_eventq(struct efx_channel *channel);
 214
 215 /* Dummy PHY ops for PHY drivers */
 216 int efx_port_dummy_op_int(struct efx_nic *efx);
 217 void efx_port_dummy_op_void(struct efx_nic *efx);
 218
 219 /* Update the generic software stats in the passed stats array */
 220 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
 221
 222 /* MTD */
 223 #ifdef CONFIG_SFC_MTD
 224 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
 225                 size_t n_parts, size_t sizeof_part);
 226 static inline int efx_mtd_probe(struct efx_nic *efx)
 227 {
 228         return efx->type->mtd_probe(efx);
 229 }
 230 void efx_mtd_rename(struct efx_nic *efx);
 231 void efx_mtd_remove(struct efx_nic *efx);
 232 #else
 233 static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
 234 static inline void efx_mtd_rename(struct efx_nic *efx) {}
 235 static inline void efx_mtd_remove(struct efx_nic *efx) {}
 236 #endif
 237
 238 #ifdef CONFIG_SFC_SRIOV
 239 static inline unsigned int efx_vf_size(struct efx_nic *efx)
 240 {
 241         return 1 << efx->vi_scale;
 242 }
 243 #endif
 244
 245 static inline void efx_schedule_channel(struct efx_channel *channel)
 246 {
 247         netif_vdbg(channel->efx, intr, channel->efx->net_dev,
 248                    "channel %d scheduling NAPI poll on CPU%d\n",
 249                    channel->channel, raw_smp_processor_id());
 250
 251         napi_schedule(&channel->napi_str);
 252 }
 253
 254 static inline void efx_schedule_channel_irq(struct efx_channel *channel)
 255 {
 256         channel->event_test_cpu = raw_smp_processor_id();
 257         efx_schedule_channel(channel);
 258 }
 259
 260 void efx_link_status_changed(struct efx_nic *efx);
 261 void efx_link_set_advertising(struct efx_nic *efx,
 262                               const unsigned long *advertising);
 263 void efx_link_clear_advertising(struct efx_nic *efx);
 264 void efx_link_set_wanted_fc(struct efx_nic *efx, u8);
 265
 266 static inline void efx_device_detach_sync(struct efx_nic *efx)
 267 {
 268         struct net_device *dev = efx->net_dev;
 269
 270         /* Lock/freeze all TX queues so that we can be sure the
 271          * TX scheduler is stopped when we're done and before
 272          * netif_device_present() becomes false.
 273          */
 274         netif_tx_lock_bh(dev);
 275         netif_device_detach(dev);
 276         netif_tx_unlock_bh(dev);
 277 }
 278
 279 static inline void efx_device_attach_if_not_resetting(struct efx_nic *efx)
 280 {
 281         if ((efx->state != STATE_DISABLED) && !efx->reset_pending)
 282                 netif_device_attach(efx->net_dev);
 283 }
 284
 285 static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem)
 286 {
 287         if (WARN_ON(down_read_trylock(sem))) {
 288                 up_read(sem);
 289                 return false;
 290         }
 291         return true;
 292 }
 293
 294 #endif /* EFX_EFX_H */