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 #define EFX_MEM_BAR 2
  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, u8 num_tc);
  31 unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
  32 extern unsigned int efx_piobuf_size;
  33
  34 /* RX */
  35 void efx_rx_config_page_split(struct efx_nic *efx);
  36 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
  37 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
  38 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
  39 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
  40 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
  41 void efx_rx_slow_fill(unsigned long context);
  42 void __efx_rx_packet(struct efx_channel *channel);
  43 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
  44                    unsigned int n_frags, unsigned int len, u16 flags);
  45 static inline void efx_rx_flush_packet(struct efx_channel *channel)
  46 {
  47         if (channel->rx_pkt_n_frags)
  48                 __efx_rx_packet(channel);
  49 }
  50 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
  51
  52 #define EFX_MAX_DMAQ_SIZE 4096UL
  53 #define EFX_DEFAULT_DMAQ_SIZE 1024UL
  54 #define EFX_MIN_DMAQ_SIZE 512UL
  55
  56 #define EFX_MAX_EVQ_SIZE 16384UL
  57 #define EFX_MIN_EVQ_SIZE 512UL
  58
  59 /* Maximum number of TCP segments we support for soft-TSO */
  60 #define EFX_TSO_MAX_SEGS        100
  61
  62 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  63  * is a bit arbitrary.  For TX, we must have space for at least 2
  64  * TSO skbs.
  65  */
  66 #define EFX_RXQ_MIN_ENT         128U
  67 #define EFX_TXQ_MIN_ENT(efx)    (2 * efx_tx_max_skb_descs(efx))
  68
  69 #define EFX_TXQ_MAX_ENT(efx)    (EFX_WORKAROUND_35388(efx) ? \
  70                                  EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)
  71
  72 /* Filters */
  73
  74 /**
  75  * efx_filter_insert_filter - add or replace a filter
  76  * @efx: NIC in which to insert the filter
  77  * @spec: Specification for the filter
  78  * @replace_equal: Flag for whether the specified filter may replace an
  79  *      existing filter with equal priority
  80  *
  81  * On success, return the filter ID.
  82  * On failure, return a negative error code.
  83  *
  84  * If existing filters have equal match values to the new filter spec,
  85  * then the new filter might replace them or the function might fail,
  86  * as follows.
  87  *
  88  * 1. If the existing filters have lower priority, or @replace_equal
  89  *    is set and they have equal priority, replace them.
  90  *
  91  * 2. If the existing filters have higher priority, return -%EPERM.
  92  *
  93  * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
  94  *    support delivery to multiple recipients, return -%EEXIST.
  95  *
  96  * This implies that filters for multiple multicast recipients must
  97  * all be inserted with the same priority and @replace_equal = %false.
  98  */
  99 static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
 100                                            struct efx_filter_spec *spec,
 101                                            bool replace_equal)
 102 {
 103         return efx->type->filter_insert(efx, spec, replace_equal);
 104 }
 105
 106 /**
 107  * efx_filter_remove_id_safe - remove a filter by ID, carefully
 108  * @efx: NIC from which to remove the filter
 109  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 110  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 111  *
 112  * This function will range-check @filter_id, so it is safe to call
 113  * with a value passed from userland.
 114  */
 115 static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
 116                                             enum efx_filter_priority priority,
 117                                             u32 filter_id)
 118 {
 119         return efx->type->filter_remove_safe(efx, priority, filter_id);
 120 }
 121
 122 /**
 123  * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
 124  * @efx: NIC from which to remove the filter
 125  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 126  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 127  * @spec: Buffer in which to store filter specification
 128  *
 129  * This function will range-check @filter_id, so it is safe to call
 130  * with a value passed from userland.
 131  */
 132 static inline int
 133 efx_filter_get_filter_safe(struct efx_nic *efx,
 134                            enum efx_filter_priority priority,
 135                            u32 filter_id, struct efx_filter_spec *spec)
 136 {
 137         return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 138 }
 139
 140 static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
 141                                            enum efx_filter_priority priority)
 142 {
 143         return efx->type->filter_count_rx_used(efx, priority);
 144 }
 145 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 146 {
 147         return efx->type->filter_get_rx_id_limit(efx);
 148 }
 149 static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
 150                                         enum efx_filter_priority priority,
 151                                         u32 *buf, u32 size)
 152 {
 153         return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 154 }
 155 #ifdef CONFIG_RFS_ACCEL
 156 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 157                    u16 rxq_index, u32 flow_id);
 158 bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
 159 static inline void efx_filter_rfs_expire(struct efx_channel *channel)
 160 {
 161         if (channel->rfs_filters_added >= 60 &&
 162             __efx_filter_rfs_expire(channel->efx, 100))
 163                 channel->rfs_filters_added -= 60;
 164 }
 165 #define efx_filter_rfs_enabled() 1
 166 #else
 167 static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
 168 #define efx_filter_rfs_enabled() 0
 169 #endif
 170 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);
 171
 172 /* Channels */
 173 int efx_channel_dummy_op_int(struct efx_channel *channel);
 174 void efx_channel_dummy_op_void(struct efx_channel *channel);
 175 int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
 176
 177 /* Ports */
 178 int efx_reconfigure_port(struct efx_nic *efx);
 179 int __efx_reconfigure_port(struct efx_nic *efx);
 180
 181 /* Ethtool support */
 182 extern const struct ethtool_ops efx_ethtool_ops;
 183
 184 /* Reset handling */
 185 int efx_reset(struct efx_nic *efx, enum reset_type method);
 186 void efx_reset_down(struct efx_nic *efx, enum reset_type method);
 187 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
 188 int efx_try_recovery(struct efx_nic *efx);
 189
 190 /* Global */
 191 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
 192 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
 193                             unsigned int rx_usecs, bool rx_adaptive,
 194                             bool rx_may_override_tx);
 195 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 196                             unsigned int *rx_usecs, bool *rx_adaptive);
 197 void efx_stop_eventq(struct efx_channel *channel);
 198 void efx_start_eventq(struct efx_channel *channel);
 199
 200 /* Dummy PHY ops for PHY drivers */
 201 int efx_port_dummy_op_int(struct efx_nic *efx);
 202 void efx_port_dummy_op_void(struct efx_nic *efx);
 203
 204 /* Update the generic software stats in the passed stats array */
 205 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
 206
 207 /* MTD */
 208 #ifdef CONFIG_SFC_MTD
 209 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
 210                 size_t n_parts, size_t sizeof_part);
 211 static inline int efx_mtd_probe(struct efx_nic *efx)
 212 {
 213         return efx->type->mtd_probe(efx);
 214 }
 215 void efx_mtd_rename(struct efx_nic *efx);
 216 void efx_mtd_remove(struct efx_nic *efx);
 217 #else
 218 static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
 219 static inline void efx_mtd_rename(struct efx_nic *efx) {}
 220 static inline void efx_mtd_remove(struct efx_nic *efx) {}
 221 #endif
 222
 223 static inline void efx_schedule_channel(struct efx_channel *channel)
 224 {
 225         netif_vdbg(channel->efx, intr, channel->efx->net_dev,
 226                    "channel %d scheduling NAPI poll on CPU%d\n",
 227                    channel->channel, raw_smp_processor_id());
 228
 229         napi_schedule(&channel->napi_str);
 230 }
 231
 232 static inline void efx_schedule_channel_irq(struct efx_channel *channel)
 233 {
 234         channel->event_test_cpu = raw_smp_processor_id();
 235         efx_schedule_channel(channel);
 236 }
 237
 238 void efx_link_status_changed(struct efx_nic *efx);
 239 void efx_link_set_advertising(struct efx_nic *efx, u32);
 240 void efx_link_set_wanted_fc(struct efx_nic *efx, u8);
 241
 242 static inline void efx_device_detach_sync(struct efx_nic *efx)
 243 {
 244         struct net_device *dev = efx->net_dev;
 245
 246         /* Lock/freeze all TX queues so that we can be sure the
 247          * TX scheduler is stopped when we're done and before
 248          * netif_device_present() becomes false.
 249          */
 250         netif_tx_lock_bh(dev);
 251         netif_device_detach(dev);
 252         netif_tx_unlock_bh(dev);
 253 }
 254
 255 #endif /* EFX_EFX_H */