drivers/net/ethernet/sfc/efx.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /****************************************************************************
   3  * Driver for Solarflare network controllers and boards
   4  * Copyright 2005-2006 Fen Systems Ltd.
   5  * Copyright 2006-2013 Solarflare Communications Inc.
   6  */
   7
   8 #ifndef EFX_EFX_H
   9 #define EFX_EFX_H
  10
  11 #include <linux/indirect_call_wrapper.h>
  12 #include "net_driver.h"
  13 #include "ef100_rx.h"
  14 #include "ef100_tx.h"
  15 #include "efx_common.h"
  16 #include "filter.h"
  17
  18 int efx_net_open(struct net_device *net_dev);
  19 int efx_net_stop(struct net_device *net_dev);
  20
  21 /* TX */
  22 void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
  23 netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
  24                                 struct net_device *net_dev);
  25 netdev_tx_t __efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
  26 static inline netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb)
  27 {
  28         return INDIRECT_CALL_2(tx_queue->efx->type->tx_enqueue,
  29                                ef100_enqueue_skb, __efx_enqueue_skb,
  30                                tx_queue, skb);
  31 }
  32 void efx_xmit_done_single(struct efx_tx_queue *tx_queue);
  33 extern unsigned int efx_piobuf_size;
  34
  35 /* RX */
  36 void __efx_rx_packet(struct efx_channel *channel);
  37 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
  38                    unsigned int n_frags, unsigned int len, u16 flags);
  39 static inline void efx_rx_flush_packet(struct efx_channel *channel)
  40 {
  41         if (channel->rx_pkt_n_frags)
  42                 INDIRECT_CALL_2(channel->efx->type->rx_packet,
  43                                 __ef100_rx_packet, __efx_rx_packet,
  44                                 channel);
  45 }
  46 static inline bool efx_rx_buf_hash_valid(struct efx_nic *efx, const u8 *prefix)
  47 {
  48         if (efx->type->rx_buf_hash_valid)
  49                 return INDIRECT_CALL_1(efx->type->rx_buf_hash_valid,
  50                                        ef100_rx_buf_hash_valid,
  51                                        prefix);
  52         return true;
  53 }
  54
  55 /* Maximum number of TCP segments we support for soft-TSO */
  56 #define EFX_TSO_MAX_SEGS        100
  57
  58 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  59  * is a bit arbitrary.  For TX, we must have space for at least 2
  60  * TSO skbs.
  61  */
  62 #define EFX_RXQ_MIN_ENT         128U
  63 #define EFX_TXQ_MIN_ENT(efx)    (2 * efx_tx_max_skb_descs(efx))
  64
  65 /* All EF10 architecture NICs steal one bit of the DMAQ size for various
  66  * other purposes when counting TxQ entries, so we halve the queue size.
  67  */
  68 #define EFX_TXQ_MAX_ENT(efx)    (EFX_WORKAROUND_EF10(efx) ? \
  69                                  EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)
  70
  71 static inline bool efx_rss_enabled(struct efx_nic *efx)
  72 {
  73         return efx->rss_spread > 1;
  74 }
  75
  76 /* Filters */
  77
  78 /**
  79  * efx_filter_insert_filter - add or replace a filter
  80  * @efx: NIC in which to insert the filter
  81  * @spec: Specification for the filter
  82  * @replace_equal: Flag for whether the specified filter may replace an
  83  *      existing filter with equal priority
  84  *
  85  * On success, return the filter ID.
  86  * On failure, return a negative error code.
  87  *
  88  * If existing filters have equal match values to the new filter spec,
  89  * then the new filter might replace them or the function might fail,
  90  * as follows.
  91  *
  92  * 1. If the existing filters have lower priority, or @replace_equal
  93  *    is set and they have equal priority, replace them.
  94  *
  95  * 2. If the existing filters have higher priority, return -%EPERM.
  96  *
  97  * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
  98  *    support delivery to multiple recipients, return -%EEXIST.
  99  *
 100  * This implies that filters for multiple multicast recipients must
 101  * all be inserted with the same priority and @replace_equal = %false.
 102  */
 103 static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
 104                                            struct efx_filter_spec *spec,
 105                                            bool replace_equal)
 106 {
 107         return efx->type->filter_insert(efx, spec, replace_equal);
 108 }
 109
 110 /**
 111  * efx_filter_remove_id_safe - remove a filter by ID, carefully
 112  * @efx: NIC from which to remove the filter
 113  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 114  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 115  *
 116  * This function will range-check @filter_id, so it is safe to call
 117  * with a value passed from userland.
 118  */
 119 static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
 120                                             enum efx_filter_priority priority,
 121                                             u32 filter_id)
 122 {
 123         return efx->type->filter_remove_safe(efx, priority, filter_id);
 124 }
 125
 126 /**
 127  * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
 128  * @efx: NIC from which to remove the filter
 129  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
 130  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
 131  * @spec: Buffer in which to store filter specification
 132  *
 133  * This function will range-check @filter_id, so it is safe to call
 134  * with a value passed from userland.
 135  */
 136 static inline int
 137 efx_filter_get_filter_safe(struct efx_nic *efx,
 138                            enum efx_filter_priority priority,
 139                            u32 filter_id, struct efx_filter_spec *spec)
 140 {
 141         return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 142 }
 143
 144 static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
 145                                            enum efx_filter_priority priority)
 146 {
 147         return efx->type->filter_count_rx_used(efx, priority);
 148 }
 149 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 150 {
 151         return efx->type->filter_get_rx_id_limit(efx);
 152 }
 153 static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
 154                                         enum efx_filter_priority priority,
 155                                         u32 *buf, u32 size)
 156 {
 157         return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 158 }
 159
 160 /* RSS contexts */
 161 static inline bool efx_rss_active(struct efx_rss_context_priv *ctx)
 162 {
 163         return ctx->context_id != EFX_MCDI_RSS_CONTEXT_INVALID;
 164 }
 165
 166 /* Ethtool support */
 167 extern const struct ethtool_ops efx_ethtool_ops;
 168
 169 /* Global */
 170 unsigned int efx_usecs_to_ticks(struct efx_nic *efx, unsigned int usecs);
 171 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
 172                             unsigned int rx_usecs, bool rx_adaptive,
 173                             bool rx_may_override_tx);
 174 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 175                             unsigned int *rx_usecs, bool *rx_adaptive);
 176
 177 /* Update the generic software stats in the passed stats array */
 178 void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
 179
 180 /* MTD */
 181 #ifdef CONFIG_SFC_MTD
 182 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
 183                 size_t n_parts, size_t sizeof_part);
 184 static inline int efx_mtd_probe(struct efx_nic *efx)
 185 {
 186         return efx->type->mtd_probe(efx);
 187 }
 188 void efx_mtd_rename(struct efx_nic *efx);
 189 void efx_mtd_remove(struct efx_nic *efx);
 190 #else
 191 static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
 192 static inline void efx_mtd_rename(struct efx_nic *efx) {}
 193 static inline void efx_mtd_remove(struct efx_nic *efx) {}
 194 #endif
 195
 196 #ifdef CONFIG_SFC_SRIOV
 197 static inline unsigned int efx_vf_size(struct efx_nic *efx)
 198 {
 199         return 1 << efx->vi_scale;
 200 }
 201 #endif
 202
 203 static inline void efx_device_detach_sync(struct efx_nic *efx)
 204 {
 205         struct net_device *dev = efx->net_dev;
 206
 207         /* We must stop reps (which use our TX) before we stop ourselves. */
 208         efx_detach_reps(efx);
 209
 210         /* Lock/freeze all TX queues so that we can be sure the
 211          * TX scheduler is stopped when we're done and before
 212          * netif_device_present() becomes false.
 213          */
 214         netif_tx_lock_bh(dev);
 215         netif_device_detach(dev);
 216         netif_tx_unlock_bh(dev);
 217 }
 218
 219 static inline void efx_device_attach_if_not_resetting(struct efx_nic *efx)
 220 {
 221         if ((efx->state != STATE_DISABLED) && !efx->reset_pending) {
 222                 netif_device_attach(efx->net_dev);
 223                 if (efx->state == STATE_NET_UP)
 224                         efx_attach_reps(efx);
 225         }
 226 }
 227
 228 static inline bool efx_rwsem_assert_write_locked(struct rw_semaphore *sem)
 229 {
 230         if (WARN_ON(down_read_trylock(sem))) {
 231                 up_read(sem);
 232                 return false;
 233         }
 234         return true;
 235 }
 236
 237 int efx_xdp_tx_buffers(struct efx_nic *efx, int n, struct xdp_frame **xdpfs,
 238                        bool flush);
 239
 240 #endif /* EFX_EFX_H */