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 /* 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 EFX_MEM_BAR 2
  20 #define EFX_MEM_VF_BAR 0
  21
  22 int efx_net_open(struct net_device *net_dev);
  23 int efx_net_stop(struct net_device *net_dev);
  24
  25 /* TX */
  26 int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
  27 void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
  28 void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
  29 void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
  30 void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
  31 netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
  32                                 struct net_device *net_dev);
  33 netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
  34 void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
  35 int efx_setup_tc(struct net_device *net_dev, u32 handle, __be16 proto,
  36                  struct tc_to_netdev *tc);
  37 unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
  38 extern unsigned int efx_piobuf_size;
  39 extern bool efx_separate_tx_channels;
  40
  41 /* RX */
  42 void efx_set_default_rx_indir_table(struct efx_nic *efx);
  43 void efx_rx_config_page_split(struct efx_nic *efx);
  44 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
  45 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
  46 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
  47 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
  48 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
  49 void efx_rx_slow_fill(unsigned long context);
  50 void __efx_rx_packet(struct efx_channel *channel);
  51 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
  52                    unsigned int n_frags, unsigned int len, u16 flags);
  53 static inline void efx_rx_flush_packet(struct efx_channel *channel)
  54 {
  55         if (channel->rx_pkt_n_frags)
  56                 __efx_rx_packet(channel);
  57 }
  58 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
  59
  60 #define EFX_MAX_DMAQ_SIZE 4096UL
  61 #define EFX_DEFAULT_DMAQ_SIZE 1024UL
  62 #define EFX_MIN_DMAQ_SIZE 512UL
  63
  64 #define EFX_MAX_EVQ_SIZE 16384UL
  65 #define EFX_MIN_EVQ_SIZE 512UL
  66
  67 /* Maximum number of TCP segments we support for soft-TSO */
  68 #define EFX_TSO_MAX_SEGS        100
  69
  70 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  71  * is a bit arbitrary.  For TX, we must have space for at least 2
  72  * TSO skbs.
  73  */
  74 #define EFX_RXQ_MIN_ENT         128U
  75 #define EFX_TXQ_MIN_ENT(efx)    (2 * efx_tx_max_skb_descs(efx))
  76
  77 #define EFX_TXQ_MAX_ENT(efx)    (EFX_WORKAROUND_35388(efx) ? \
  78                                  EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)
  79
  80 static inline bool efx_rss_enabled(struct efx_nic *efx)
  81 {
  82         return efx->rss_spread > 1;
  83 }
  84
  85 /* Filters */
  86
  87 void efx_mac_reconfigure(struct efx_nic *efx);
  88
  89 /**
  90  * efx_filter_insert_filter - add or replace a filter
  91  * @efx: NIC in which to insert the filter
  92  * @spec: Specification for the filter
  93  * @replace_equal: Flag for whether the specified filter may replace an
  94  *      existing filter with equal priority
  95  *
  96  * On success, return the filter ID.
  97  * On failure, return a negative error code.
  98  *
  99  * If existing filters have equal match values to the new filter spec,
 100  * then the new filter might replace them or the function might fail,
 101  * as follows.
 102  *
 103  * 1. If the existing filters have lower priority, or @replace_equal
 104  *    is set and they have equal priority, replace them.
 105  *
 106  * 2. If the existing filters have higher priority, return -%EPERM.
 107  *
 108  * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
 109  *    support delivery to multiple recipients, return -%EEXIST.
 110  *
 111  * This implies that filters for multiple multicast recipients must
 112  * all be inserted with the same priority and @replace_equal = %false.
 113  */
 114 static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
 115                                            struct efx_filter_spec *spec,
 116                                            bool replace_equal)
 117 {
 118         return efx->type->filter_insert(efx, spec, replace_equal);
 119 }
 120
 121 /**
 122  * efx_filter_remove_id_safe - remove a filter by ID, carefully
 123  * @efx: NIC from which to remove the filter
 124  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 125  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 126  *
 127  * This function will range-check @filter_id, so it is safe to call
 128  * with a value passed from userland.
 129  */
 130 static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
 131                                             enum efx_filter_priority priority,
 132                                             u32 filter_id)
 133 {
 134         return efx->type->filter_remove_safe(efx, priority, filter_id);
 135 }
 136
 137 /**
 138  * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
 139  * @efx: NIC from which to remove the filter
 140  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 141  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 142  * @spec: Buffer in which to store filter specification
 143  *
 144  * This function will range-check @filter_id, so it is safe to call
 145  * with a value passed from userland.
 146  */
 147 static inline int
 148 efx_filter_get_filter_safe(struct efx_nic *efx,
 149                            enum efx_filter_priority priority,
 150                            u32 filter_id, struct efx_filter_spec *spec)
 151 {
 152         return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 153 }
 154
 155 static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
 156                                            enum efx_filter_priority priority)
 157 {
 158         return efx->type->filter_count_rx_used(efx, priority);
 159 }
 160 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 161 {
 162         return efx->type->filter_get_rx_id_limit(efx);
 163 }
 164 static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
 165                                         enum efx_filter_priority priority,
 166                                         u32 *buf, u32 size)
 167 {
 168         return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 169 }
 170 #ifdef CONFIG_RFS_ACCEL
 171 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 172                    u16 rxq_index, u32 flow_id);
 173 bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
 174 static inline void efx_filter_rfs_expire(struct efx_channel *channel)
 175 {
 176         if (channel->rfs_filters_added >= 60 &&
 177             __efx_filter_rfs_expire(channel->efx, 100))
 178                 channel->rfs_filters_added -= 60;
 179 }
 180 #define efx_filter_rfs_enabled() 1
 181 #else
 182 static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
 183 #define efx_filter_rfs_enabled() 0
 184 #endif
 185 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
 186
 187 /* Channels */
 188 int efx_channel_dummy_op_int(struct efx_channel *channel);
 189 void efx_channel_dummy_op_void(struct efx_channel *channel);
 190 int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
 191
 192 /* Ports */
 193 int efx_reconfigure_port(struct efx_nic *efx);
 194 int __efx_reconfigure_port(struct efx_nic *efx);
 195
 196 /* Ethtool support */
 197 extern const struct ethtool_ops efx_ethtool_ops;
 198
 199 /* Reset handling */
 200 int efx_reset(struct efx_nic *efx, enum reset_type method);
 201 void efx_reset_down(struct efx_nic *efx, enum reset_type method);
 202 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
 203 int efx_try_recovery(struct efx_nic *efx);
 204
 205 /* Global */
 206 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
 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, u32);
 262 void efx_link_set_wanted_fc(struct efx_nic *efx, u8);
 263
 264 static inline void efx_device_detach_sync(struct efx_nic *efx)
 265 {
 266         struct net_device *dev = efx->net_dev;
 267
 268         /* Lock/freeze all TX queues so that we can be sure the
 269          * TX scheduler is stopped when we're done and before
 270          * netif_device_present() becomes false.
 271          */
 272         netif_tx_lock_bh(dev);
 273         netif_device_detach(dev);
 274         netif_tx_unlock_bh(dev);
 275 }
 276
 277 static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem)
 278 {
 279         if (WARN_ON(down_read_trylock(sem))) {
 280                 up_read(sem);
 281                 return false;
 282         }
 283         return true;
 284 }
 285
 286 #endif /* EFX_EFX_H */