drivers/net/ethernet/sfc/falcon/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 EF4_EFX_H
  12 #define EF4_EFX_H
  13
  14 #include "net_driver.h"
  15 #include "filter.h"
  16
  17 /* All controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
  18 /* All VFs use BAR 0/1 for memory */
  19 #define EF4_MEM_BAR 2
  20 #define EF4_MEM_VF_BAR 0
  21
  22 int ef4_net_open(struct net_device *net_dev);
  23 int ef4_net_stop(struct net_device *net_dev);
  24
  25 /* TX */
  26 int ef4_probe_tx_queue(struct ef4_tx_queue *tx_queue);
  27 void ef4_remove_tx_queue(struct ef4_tx_queue *tx_queue);
  28 void ef4_init_tx_queue(struct ef4_tx_queue *tx_queue);
  29 void ef4_init_tx_queue_core_txq(struct ef4_tx_queue *tx_queue);
  30 void ef4_fini_tx_queue(struct ef4_tx_queue *tx_queue);
  31 netdev_tx_t ef4_hard_start_xmit(struct sk_buff *skb,
  32                                 struct net_device *net_dev);
  33 netdev_tx_t ef4_enqueue_skb(struct ef4_tx_queue *tx_queue, struct sk_buff *skb);
  34 void ef4_xmit_done(struct ef4_tx_queue *tx_queue, unsigned int index);
  35 int ef4_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
  36                  void *type_data);
  37 unsigned int ef4_tx_max_skb_descs(struct ef4_nic *efx);
  38 extern bool ef4_separate_tx_channels;
  39
  40 /* RX */
  41 void ef4_set_default_rx_indir_table(struct ef4_nic *efx);
  42 void ef4_rx_config_page_split(struct ef4_nic *efx);
  43 int ef4_probe_rx_queue(struct ef4_rx_queue *rx_queue);
  44 void ef4_remove_rx_queue(struct ef4_rx_queue *rx_queue);
  45 void ef4_init_rx_queue(struct ef4_rx_queue *rx_queue);
  46 void ef4_fini_rx_queue(struct ef4_rx_queue *rx_queue);
  47 void ef4_fast_push_rx_descriptors(struct ef4_rx_queue *rx_queue, bool atomic);
  48 void ef4_rx_slow_fill(struct timer_list *t);
  49 void __ef4_rx_packet(struct ef4_channel *channel);
  50 void ef4_rx_packet(struct ef4_rx_queue *rx_queue, unsigned int index,
  51                    unsigned int n_frags, unsigned int len, u16 flags);
  52 static inline void ef4_rx_flush_packet(struct ef4_channel *channel)
  53 {
  54         if (channel->rx_pkt_n_frags)
  55                 __ef4_rx_packet(channel);
  56 }
  57 void ef4_schedule_slow_fill(struct ef4_rx_queue *rx_queue);
  58
  59 #define EF4_MAX_DMAQ_SIZE 4096UL
  60 #define EF4_DEFAULT_DMAQ_SIZE 1024UL
  61 #define EF4_MIN_DMAQ_SIZE 512UL
  62
  63 #define EF4_MAX_EVQ_SIZE 16384UL
  64 #define EF4_MIN_EVQ_SIZE 512UL
  65
  66 /* Maximum number of TCP segments we support for soft-TSO */
  67 #define EF4_TSO_MAX_SEGS        100
  68
  69 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  70  * is a bit arbitrary.  For TX, we must have space for at least 2
  71  * TSO skbs.
  72  */
  73 #define EF4_RXQ_MIN_ENT         128U
  74 #define EF4_TXQ_MIN_ENT(efx)    (2 * ef4_tx_max_skb_descs(efx))
  75
  76 static inline bool ef4_rss_enabled(struct ef4_nic *efx)
  77 {
  78         return efx->rss_spread > 1;
  79 }
  80
  81 /* Filters */
  82
  83 void ef4_mac_reconfigure(struct ef4_nic *efx);
  84
  85 /**
  86  * ef4_filter_insert_filter - add or replace a filter
  87  * @efx: NIC in which to insert the filter
  88  * @spec: Specification for the filter
  89  * @replace_equal: Flag for whether the specified filter may replace an
  90  *      existing filter with equal priority
  91  *
  92  * On success, return the filter ID.
  93  * On failure, return a negative error code.
  94  *
  95  * If existing filters have equal match values to the new filter spec,
  96  * then the new filter might replace them or the function might fail,
  97  * as follows.
  98  *
  99  * 1. If the existing filters have lower priority, or @replace_equal
 100  *    is set and they have equal priority, replace them.
 101  *
 102  * 2. If the existing filters have higher priority, return -%EPERM.
 103  *
 104  * 3. If !ef4_filter_is_mc_recipient(@spec), or the NIC does not
 105  *    support delivery to multiple recipients, return -%EEXIST.
 106  *
 107  * This implies that filters for multiple multicast recipients must
 108  * all be inserted with the same priority and @replace_equal = %false.
 109  */
 110 static inline s32 ef4_filter_insert_filter(struct ef4_nic *efx,
 111                                            struct ef4_filter_spec *spec,
 112                                            bool replace_equal)
 113 {
 114         return efx->type->filter_insert(efx, spec, replace_equal);
 115 }
 116
 117 /**
 118  * ef4_filter_remove_id_safe - remove a filter by ID, carefully
 119  * @efx: NIC from which to remove the filter
 120  * @priority: Priority of filter, as passed to @ef4_filter_insert_filter
 121  * @filter_id: ID of filter, as returned by @ef4_filter_insert_filter
 122  *
 123  * This function will range-check @filter_id, so it is safe to call
 124  * with a value passed from userland.
 125  */
 126 static inline int ef4_filter_remove_id_safe(struct ef4_nic *efx,
 127                                             enum ef4_filter_priority priority,
 128                                             u32 filter_id)
 129 {
 130         return efx->type->filter_remove_safe(efx, priority, filter_id);
 131 }
 132
 133 /**
 134  * ef4_filter_get_filter_safe - retrieve a filter by ID, carefully
 135  * @efx: NIC from which to remove the filter
 136  * @priority: Priority of filter, as passed to @ef4_filter_insert_filter
 137  * @filter_id: ID of filter, as returned by @ef4_filter_insert_filter
 138  * @spec: Buffer in which to store filter specification
 139  *
 140  * This function will range-check @filter_id, so it is safe to call
 141  * with a value passed from userland.
 142  */
 143 static inline int
 144 ef4_filter_get_filter_safe(struct ef4_nic *efx,
 145                            enum ef4_filter_priority priority,
 146                            u32 filter_id, struct ef4_filter_spec *spec)
 147 {
 148         return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 149 }
 150
 151 static inline u32 ef4_filter_count_rx_used(struct ef4_nic *efx,
 152                                            enum ef4_filter_priority priority)
 153 {
 154         return efx->type->filter_count_rx_used(efx, priority);
 155 }
 156 static inline u32 ef4_filter_get_rx_id_limit(struct ef4_nic *efx)
 157 {
 158         return efx->type->filter_get_rx_id_limit(efx);
 159 }
 160 static inline s32 ef4_filter_get_rx_ids(struct ef4_nic *efx,
 161                                         enum ef4_filter_priority priority,
 162                                         u32 *buf, u32 size)
 163 {
 164         return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 165 }
 166 #ifdef CONFIG_RFS_ACCEL
 167 int ef4_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 168                    u16 rxq_index, u32 flow_id);
 169 bool __ef4_filter_rfs_expire(struct ef4_nic *efx, unsigned quota);
 170 static inline void ef4_filter_rfs_expire(struct ef4_channel *channel)
 171 {
 172         if (channel->rfs_filters_added >= 60 &&
 173             __ef4_filter_rfs_expire(channel->efx, 100))
 174                 channel->rfs_filters_added -= 60;
 175 }
 176 #define ef4_filter_rfs_enabled() 1
 177 #else
 178 static inline void ef4_filter_rfs_expire(struct ef4_channel *channel) {}
 179 #define ef4_filter_rfs_enabled() 0
 180 #endif
 181 bool ef4_filter_is_mc_recipient(const struct ef4_filter_spec *spec);
 182
 183 /* Channels */
 184 int ef4_channel_dummy_op_int(struct ef4_channel *channel);
 185 void ef4_channel_dummy_op_void(struct ef4_channel *channel);
 186 int ef4_realloc_channels(struct ef4_nic *efx, u32 rxq_entries, u32 txq_entries);
 187
 188 /* Ports */
 189 int ef4_reconfigure_port(struct ef4_nic *efx);
 190 int __ef4_reconfigure_port(struct ef4_nic *efx);
 191
 192 /* Ethtool support */
 193 extern const struct ethtool_ops ef4_ethtool_ops;
 194
 195 /* Reset handling */
 196 int ef4_reset(struct ef4_nic *efx, enum reset_type method);
 197 void ef4_reset_down(struct ef4_nic *efx, enum reset_type method);
 198 int ef4_reset_up(struct ef4_nic *efx, enum reset_type method, bool ok);
 199 int ef4_try_recovery(struct ef4_nic *efx);
 200
 201 /* Global */
 202 void ef4_schedule_reset(struct ef4_nic *efx, enum reset_type type);
 203 unsigned int ef4_usecs_to_ticks(struct ef4_nic *efx, unsigned int usecs);
 204 unsigned int ef4_ticks_to_usecs(struct ef4_nic *efx, unsigned int ticks);
 205 int ef4_init_irq_moderation(struct ef4_nic *efx, unsigned int tx_usecs,
 206                             unsigned int rx_usecs, bool rx_adaptive,
 207                             bool rx_may_override_tx);
 208 void ef4_get_irq_moderation(struct ef4_nic *efx, unsigned int *tx_usecs,
 209                             unsigned int *rx_usecs, bool *rx_adaptive);
 210 void ef4_stop_eventq(struct ef4_channel *channel);
 211 void ef4_start_eventq(struct ef4_channel *channel);
 212
 213 /* Dummy PHY ops for PHY drivers */
 214 int ef4_port_dummy_op_int(struct ef4_nic *efx);
 215 void ef4_port_dummy_op_void(struct ef4_nic *efx);
 216
 217 /* Update the generic software stats in the passed stats array */
 218 void ef4_update_sw_stats(struct ef4_nic *efx, u64 *stats);
 219
 220 /* MTD */
 221 #ifdef CONFIG_SFC_FALCON_MTD
 222 int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
 223                 size_t n_parts, size_t sizeof_part);
 224 static inline int ef4_mtd_probe(struct ef4_nic *efx)
 225 {
 226         return efx->type->mtd_probe(efx);
 227 }
 228 void ef4_mtd_rename(struct ef4_nic *efx);
 229 void ef4_mtd_remove(struct ef4_nic *efx);
 230 #else
 231 static inline int ef4_mtd_probe(struct ef4_nic *efx) { return 0; }
 232 static inline void ef4_mtd_rename(struct ef4_nic *efx) {}
 233 static inline void ef4_mtd_remove(struct ef4_nic *efx) {}
 234 #endif
 235
 236 static inline void ef4_schedule_channel(struct ef4_channel *channel)
 237 {
 238         netif_vdbg(channel->efx, intr, channel->efx->net_dev,
 239                    "channel %d scheduling NAPI poll on CPU%d\n",
 240                    channel->channel, raw_smp_processor_id());
 241
 242         napi_schedule(&channel->napi_str);
 243 }
 244
 245 static inline void ef4_schedule_channel_irq(struct ef4_channel *channel)
 246 {
 247         channel->event_test_cpu = raw_smp_processor_id();
 248         ef4_schedule_channel(channel);
 249 }
 250
 251 void ef4_link_status_changed(struct ef4_nic *efx);
 252 void ef4_link_set_advertising(struct ef4_nic *efx, u32);
 253 void ef4_link_set_wanted_fc(struct ef4_nic *efx, u8);
 254
 255 static inline void ef4_device_detach_sync(struct ef4_nic *efx)
 256 {
 257         struct net_device *dev = efx->net_dev;
 258
 259         /* Lock/freeze all TX queues so that we can be sure the
 260          * TX scheduler is stopped when we're done and before
 261          * netif_device_present() becomes false.
 262          */
 263         netif_tx_lock_bh(dev);
 264         netif_device_detach(dev);
 265         netif_tx_unlock_bh(dev);
 266 }
 267
 268 static inline bool ef4_rwsem_assert_write_locked(struct rw_semaphore *sem)
 269 {
 270         if (WARN_ON(down_read_trylock(sem))) {
 271                 up_read(sem);
 272                 return false;
 273         }
 274         return true;
 275 }
 276
 277 #endif /* EF4_EFX_H */