LXR linux/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
  22int ef4_net_open(struct net_device *net_dev);
  23int ef4_net_stop(struct net_device *net_dev);
  24
  25/* TX */
  26int ef4_probe_tx_queue(struct ef4_tx_queue *tx_queue);
  27void ef4_remove_tx_queue(struct ef4_tx_queue *tx_queue);
  28void ef4_init_tx_queue(struct ef4_tx_queue *tx_queue);
  29void ef4_init_tx_queue_core_txq(struct ef4_tx_queue *tx_queue);
  30void ef4_fini_tx_queue(struct ef4_tx_queue *tx_queue);
  31netdev_tx_t ef4_hard_start_xmit(struct sk_buff *skb,
  32                                struct net_device *net_dev);
  33netdev_tx_t ef4_enqueue_skb(struct ef4_tx_queue *tx_queue, struct sk_buff *skb);
  34void ef4_xmit_done(struct ef4_tx_queue *tx_queue, unsigned int index);
  35int ef4_setup_tc(struct net_device *net_dev, enum tc_setup_type type,
  36                 void *type_data);
  37unsigned int ef4_tx_max_skb_descs(struct ef4_nic *efx);
  38extern bool ef4_separate_tx_channels;
  39
  40/* RX */
  41void ef4_set_default_rx_indir_table(struct ef4_nic *efx);
  42void ef4_rx_config_page_split(struct ef4_nic *efx);
  43int ef4_probe_rx_queue(struct ef4_rx_queue *rx_queue);
  44void ef4_remove_rx_queue(struct ef4_rx_queue *rx_queue);
  45void ef4_init_rx_queue(struct ef4_rx_queue *rx_queue);
  46void ef4_fini_rx_queue(struct ef4_rx_queue *rx_queue);
  47void ef4_fast_push_rx_descriptors(struct ef4_rx_queue *rx_queue, bool atomic);
  48void ef4_rx_slow_fill(struct timer_list *t);
  49void __ef4_rx_packet(struct ef4_channel *channel);
  50void ef4_rx_packet(struct ef4_rx_queue *rx_queue, unsigned int index,
  51                   unsigned int n_frags, unsigned int len, u16 flags);
  52static inline void ef4_rx_flush_packet(struct ef4_channel *channel)
  53{
  54        if (channel->rx_pkt_n_frags)
  55                __ef4_rx_packet(channel);
  56}
  57void 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
  76static inline bool ef4_rss_enabled(struct ef4_nic *efx)
  77{
  78        return efx->rss_spread > 1;
  79}
  80
  81/* Filters */
  82
  83void 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 */
 110static 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 */
 126static 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 */
 143static inline int
 144ef4_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
 151static 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}
 156static inline u32 ef4_filter_get_rx_id_limit(struct ef4_nic *efx)
 157{
 158        return efx->type->filter_get_rx_id_limit(efx);
 159}
 160static 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
 167int ef4_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 168                   u16 rxq_index, u32 flow_id);
 169bool __ef4_filter_rfs_expire(struct ef4_nic *efx, unsigned quota);
 170static 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
 178static inline void ef4_filter_rfs_expire(struct ef4_channel *channel) {}
 179#define ef4_filter_rfs_enabled() 0
 180#endif
 181bool ef4_filter_is_mc_recipient(const struct ef4_filter_spec *spec);
 182
 183/* Channels */
 184int ef4_channel_dummy_op_int(struct ef4_channel *channel);
 185void ef4_channel_dummy_op_void(struct ef4_channel *channel);
 186int ef4_realloc_channels(struct ef4_nic *efx, u32 rxq_entries, u32 txq_entries);
 187
 188/* Ports */
 189int ef4_reconfigure_port(struct ef4_nic *efx);
 190int __ef4_reconfigure_port(struct ef4_nic *efx);
 191
 192/* Ethtool support */
 193extern const struct ethtool_ops ef4_ethtool_ops;
 194
 195/* Reset handling */
 196int ef4_reset(struct ef4_nic *efx, enum reset_type method);
 197void ef4_reset_down(struct ef4_nic *efx, enum reset_type method);
 198int ef4_reset_up(struct ef4_nic *efx, enum reset_type method, bool ok);
 199int ef4_try_recovery(struct ef4_nic *efx);
 200
 201/* Global */
 202void ef4_schedule_reset(struct ef4_nic *efx, enum reset_type type);
 203unsigned int ef4_usecs_to_ticks(struct ef4_nic *efx, unsigned int usecs);
 204unsigned int ef4_ticks_to_usecs(struct ef4_nic *efx, unsigned int ticks);
 205int 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);
 208void ef4_get_irq_moderation(struct ef4_nic *efx, unsigned int *tx_usecs,
 209                            unsigned int *rx_usecs, bool *rx_adaptive);
 210void ef4_stop_eventq(struct ef4_channel *channel);
 211void ef4_start_eventq(struct ef4_channel *channel);
 212
 213/* Dummy PHY ops for PHY drivers */
 214int ef4_port_dummy_op_int(struct ef4_nic *efx);
 215void ef4_port_dummy_op_void(struct ef4_nic *efx);
 216
 217/* Update the generic software stats in the passed stats array */
 218void ef4_update_sw_stats(struct ef4_nic *efx, u64 *stats);
 219
 220/* MTD */
 221#ifdef CONFIG_SFC_FALCON_MTD
 222int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
 223                size_t n_parts, size_t sizeof_part);
 224static inline int ef4_mtd_probe(struct ef4_nic *efx)
 225{
 226        return efx->type->mtd_probe(efx);
 227}
 228void ef4_mtd_rename(struct ef4_nic *efx);
 229void ef4_mtd_remove(struct ef4_nic *efx);
 230#else
 231static inline int ef4_mtd_probe(struct ef4_nic *efx) { return 0; }
 232static inline void ef4_mtd_rename(struct ef4_nic *efx) {}
 233static inline void ef4_mtd_remove(struct ef4_nic *efx) {}
 234#endif
 235
 236static 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
 245static 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
 251void ef4_link_status_changed(struct ef4_nic *efx);
 252void ef4_link_set_advertising(struct ef4_nic *efx, u32);
 253void ef4_link_set_wanted_fc(struct ef4_nic *efx, u8);
 254
 255static 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
 268static 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 */
 278