drivers/net/ethernet/sfc/efx.h - maze/linux - Git at Google

 /****************************************************************************
  * Driver for Solarflare network controllers and boards
  * Copyright 2005-2006 Fen Systems Ltd.
  * Copyright 2006-2013 Solarflare Communications Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation, incorporated herein by reference.
  */

 #ifndef EFX_EFX_H
 #define EFX_EFX_H

 #include "net_driver.h"
 #include "filter.h"

 /* All controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
 #define EFX_MEM_BAR 2

 /* TX */
 int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
 void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
 void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
 void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
 void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
 netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
 				struct net_device *net_dev);
 netdev_tx_t efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
 void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
 int efx_setup_tc(struct net_device *net_dev, u8 num_tc);
 unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
 extern unsigned int efx_piobuf_size;

 /* RX */
 void efx_rx_config_page_split(struct efx_nic *efx);
 int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
 void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
 void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
 void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
 void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
 void efx_rx_slow_fill(unsigned long context);
 void __efx_rx_packet(struct efx_channel *channel);
 void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
 		   unsigned int n_frags, unsigned int len, u16 flags);
 static inline void efx_rx_flush_packet(struct efx_channel *channel)
 {
 	if (channel->rx_pkt_n_frags)
 		__efx_rx_packet(channel);
 }
 void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);

 #define EFX_MAX_DMAQ_SIZE 4096UL
 #define EFX_DEFAULT_DMAQ_SIZE 1024UL
 #define EFX_MIN_DMAQ_SIZE 512UL

 #define EFX_MAX_EVQ_SIZE 16384UL
 #define EFX_MIN_EVQ_SIZE 512UL

 /* Maximum number of TCP segments we support for soft-TSO */
 #define EFX_TSO_MAX_SEGS	100

 /* The smallest [rt]xq_entries that the driver supports.  RX minimum
  * is a bit arbitrary.  For TX, we must have space for at least 2
  * TSO skbs.
  */
 #define EFX_RXQ_MIN_ENT		128U
 #define EFX_TXQ_MIN_ENT(efx)	(2 * efx_tx_max_skb_descs(efx))

 #define EFX_TXQ_MAX_ENT(efx)	(EFX_WORKAROUND_35388(efx) ? \
 				 EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)

 /* Filters */

 /**
  * efx_filter_insert_filter - add or replace a filter
  * @efx: NIC in which to insert the filter
  * @spec: Specification for the filter
  * @replace_equal: Flag for whether the specified filter may replace an
  *	existing filter with equal priority
  *
  * On success, return the filter ID.
  * On failure, return a negative error code.
  *
  * If existing filters have equal match values to the new filter spec,
  * then the new filter might replace them or the function might fail,
  * as follows.
  *
  * 1. If the existing filters have lower priority, or @replace_equal
  *    is set and they have equal priority, replace them.
  *
  * 2. If the existing filters have higher priority, return -%EPERM.
  *
  * 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
  *    support delivery to multiple recipients, return -%EEXIST.
  *
  * This implies that filters for multiple multicast recipients must
  * all be inserted with the same priority and @replace_equal = %false.
  */
 static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
 					   struct efx_filter_spec *spec,
 					   bool replace_equal)
 {
 	return efx->type->filter_insert(efx, spec, replace_equal);
 }

 /**
  * efx_filter_remove_id_safe - remove a filter by ID, carefully
  * @efx: NIC from which to remove the filter
  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
  *
  * This function will range-check @filter_id, so it is safe to call
  * with a value passed from userland.
  */
 static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
 					    enum efx_filter_priority priority,
 					    u32 filter_id)
 {
 	return efx->type->filter_remove_safe(efx, priority, filter_id);
 }

 /**
  * efx_filter_get_filter_safe - retrieve a filter by ID, carefully
  * @efx: NIC from which to remove the filter
  * @priority: Priority of filter, as passed to @efx_filter_insert_filter
  * @filter_id: ID of filter, as returned by @efx_filter_insert_filter
  * @spec: Buffer in which to store filter specification
  *
  * This function will range-check @filter_id, so it is safe to call
  * with a value passed from userland.
  */
 static inline int
 efx_filter_get_filter_safe(struct efx_nic *efx,
 			   enum efx_filter_priority priority,
 			   u32 filter_id, struct efx_filter_spec *spec)
 {
 	return efx->type->filter_get_safe(efx, priority, filter_id, spec);
 }

 static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
 					   enum efx_filter_priority priority)
 {
 	return efx->type->filter_count_rx_used(efx, priority);
 }
 static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
 {
 	return efx->type->filter_get_rx_id_limit(efx);
 }
 static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
 					enum efx_filter_priority priority,
 					u32 *buf, u32 size)
 {
 	return efx->type->filter_get_rx_ids(efx, priority, buf, size);
 }
 #ifdef CONFIG_RFS_ACCEL
 int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
 		   u16 rxq_index, u32 flow_id);
 bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
 static inline void efx_filter_rfs_expire(struct efx_channel *channel)
 {
 	if (channel->rfs_filters_added >= 60 &&
 	    __efx_filter_rfs_expire(channel->efx, 100))
 		channel->rfs_filters_added -= 60;
 }
 #define efx_filter_rfs_enabled() 1
 #else
 static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
 #define efx_filter_rfs_enabled() 0
 #endif
 bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);

 /* Channels */
 int efx_channel_dummy_op_int(struct efx_channel *channel);
 void efx_channel_dummy_op_void(struct efx_channel *channel);
 int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);

 /* Ports */
 int efx_reconfigure_port(struct efx_nic *efx);
 int __efx_reconfigure_port(struct efx_nic *efx);

 /* Ethtool support */
 extern const struct ethtool_ops efx_ethtool_ops;

 /* Reset handling */
 int efx_reset(struct efx_nic *efx, enum reset_type method);
 void efx_reset_down(struct efx_nic *efx, enum reset_type method);
 int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
 int efx_try_recovery(struct efx_nic *efx);

 /* Global */
 void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
 			    unsigned int rx_usecs, bool rx_adaptive,
 			    bool rx_may_override_tx);
 void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
 			    unsigned int *rx_usecs, bool *rx_adaptive);

 /* Dummy PHY ops for PHY drivers */
 int efx_port_dummy_op_int(struct efx_nic *efx);
 void efx_port_dummy_op_void(struct efx_nic *efx);

 /* MTD */
 #ifdef CONFIG_SFC_MTD
 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
 		size_t n_parts, size_t sizeof_part);
 static inline int efx_mtd_probe(struct efx_nic *efx)
 {
 	return efx->type->mtd_probe(efx);
 }
 void efx_mtd_rename(struct efx_nic *efx);
 void efx_mtd_remove(struct efx_nic *efx);
 #else
 static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
 static inline void efx_mtd_rename(struct efx_nic *efx) {}
 static inline void efx_mtd_remove(struct efx_nic *efx) {}
 #endif

 static inline void efx_schedule_channel(struct efx_channel *channel)
 {
 	netif_vdbg(channel->efx, intr, channel->efx->net_dev,
 		   "channel %d scheduling NAPI poll on CPU%d\n",
 		   channel->channel, raw_smp_processor_id());

 	napi_schedule(&channel->napi_str);
 }

 static inline void efx_schedule_channel_irq(struct efx_channel *channel)
 {
 	channel->event_test_cpu = raw_smp_processor_id();
 	efx_schedule_channel(channel);
 }

 void efx_link_status_changed(struct efx_nic *efx);
 void efx_link_set_advertising(struct efx_nic *efx, u32);
 void efx_link_set_wanted_fc(struct efx_nic *efx, u8);

 static inline void efx_device_detach_sync(struct efx_nic *efx)
 {
 	struct net_device *dev = efx->net_dev;

 	/* Lock/freeze all TX queues so that we can be sure the
 	 * TX scheduler is stopped when we're done and before
 	 * netif_device_present() becomes false.
 	 */
 	netif_tx_lock_bh(dev);
 	netif_device_detach(dev);
 	netif_tx_unlock_bh(dev);
 }

 #endif /* EFX_EFX_H */
	/****************************************************************************
	* Driver for Solarflare network controllers and boards
	* Copyright 2005-2006 Fen Systems Ltd.
	* Copyright 2006-2013 Solarflare Communications Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation, incorporated herein by reference.
	*/

	#ifndef EFX_EFX_H
	#define EFX_EFX_H

	#include "net_driver.h"
	#include "filter.h"

	/* All controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
	#define EFX_MEM_BAR 2

	/* TX */
	int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
	void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
	void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
	void efx_init_tx_queue_core_txq(struct efx_tx_queue *tx_queue);
	void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
	netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb,
	struct net_device *net_dev);
	netdev_tx_t efx_enqueue_skb(struct efx_tx_queue tx_queue, struct sk_buff skb);
	void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
	int efx_setup_tc(struct net_device *net_dev, u8 num_tc);
	unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
	extern unsigned int efx_piobuf_size;

	/* RX */
	void efx_rx_config_page_split(struct efx_nic *efx);
	int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
	void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
	void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
	void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
	void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, bool atomic);
	void efx_rx_slow_fill(unsigned long context);
	void __efx_rx_packet(struct efx_channel *channel);
	void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
	unsigned int n_frags, unsigned int len, u16 flags);
	static inline void efx_rx_flush_packet(struct efx_channel *channel)
	{
	if (channel->rx_pkt_n_frags)
	__efx_rx_packet(channel);
	}
	void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);

	#define EFX_MAX_DMAQ_SIZE 4096UL
	#define EFX_DEFAULT_DMAQ_SIZE 1024UL
	#define EFX_MIN_DMAQ_SIZE 512UL

	#define EFX_MAX_EVQ_SIZE 16384UL
	#define EFX_MIN_EVQ_SIZE 512UL

	/* Maximum number of TCP segments we support for soft-TSO */
	#define EFX_TSO_MAX_SEGS 100

	/* The smallest [rt]xq_entries that the driver supports. RX minimum
	* is a bit arbitrary. For TX, we must have space for at least 2
	* TSO skbs.
	*/
	#define EFX_RXQ_MIN_ENT 128U
	#define EFX_TXQ_MIN_ENT(efx) (2 * efx_tx_max_skb_descs(efx))

	#define EFX_TXQ_MAX_ENT(efx) (EFX_WORKAROUND_35388(efx) ? \
	EFX_MAX_DMAQ_SIZE / 2 : EFX_MAX_DMAQ_SIZE)

	/* Filters */

	/**
	* efx_filter_insert_filter - add or replace a filter
	* @efx: NIC in which to insert the filter
	* @spec: Specification for the filter
	* @replace_equal: Flag for whether the specified filter may replace an
	* existing filter with equal priority
	*
	* On success, return the filter ID.
	* On failure, return a negative error code.
	*
	* If existing filters have equal match values to the new filter spec,
	* then the new filter might replace them or the function might fail,
	* as follows.
	*
	* 1. If the existing filters have lower priority, or @replace_equal
	* is set and they have equal priority, replace them.
	*
	* 2. If the existing filters have higher priority, return -%EPERM.
	*
	* 3. If !efx_filter_is_mc_recipient(@spec), or the NIC does not
	* support delivery to multiple recipients, return -%EEXIST.
	*
	* This implies that filters for multiple multicast recipients must
	* all be inserted with the same priority and @replace_equal = %false.
	*/
	static inline s32 efx_filter_insert_filter(struct efx_nic *efx,
	struct efx_filter_spec *spec,
	bool replace_equal)
	{
	return efx->type->filter_insert(efx, spec, replace_equal);
	}

	/**
	* efx_filter_remove_id_safe - remove a filter by ID, carefully
	* @efx: NIC from which to remove the filter
	* @priority: Priority of filter, as passed to @efx_filter_insert_filter
	* @filter_id: ID of filter, as returned by @efx_filter_insert_filter
	*
	* This function will range-check @filter_id, so it is safe to call
	* with a value passed from userland.
	*/
	static inline int efx_filter_remove_id_safe(struct efx_nic *efx,
	enum efx_filter_priority priority,
	u32 filter_id)
	{
	return efx->type->filter_remove_safe(efx, priority, filter_id);
	}

	/**
	* efx_filter_get_filter_safe - retrieve a filter by ID, carefully
	* @efx: NIC from which to remove the filter
	* @priority: Priority of filter, as passed to @efx_filter_insert_filter
	* @filter_id: ID of filter, as returned by @efx_filter_insert_filter
	* @spec: Buffer in which to store filter specification
	*
	* This function will range-check @filter_id, so it is safe to call
	* with a value passed from userland.
	*/
	static inline int
	efx_filter_get_filter_safe(struct efx_nic *efx,
	enum efx_filter_priority priority,
	u32 filter_id, struct efx_filter_spec *spec)
	{
	return efx->type->filter_get_safe(efx, priority, filter_id, spec);
	}

	static inline u32 efx_filter_count_rx_used(struct efx_nic *efx,
	enum efx_filter_priority priority)
	{
	return efx->type->filter_count_rx_used(efx, priority);
	}
	static inline u32 efx_filter_get_rx_id_limit(struct efx_nic *efx)
	{
	return efx->type->filter_get_rx_id_limit(efx);
	}
	static inline s32 efx_filter_get_rx_ids(struct efx_nic *efx,
	enum efx_filter_priority priority,
	u32 *buf, u32 size)
	{
	return efx->type->filter_get_rx_ids(efx, priority, buf, size);
	}
	#ifdef CONFIG_RFS_ACCEL
	int efx_filter_rfs(struct net_device net_dev, const struct sk_buff skb,
	u16 rxq_index, u32 flow_id);
	bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
	static inline void efx_filter_rfs_expire(struct efx_channel *channel)
	{
	if (channel->rfs_filters_added >= 60 &&
	__efx_filter_rfs_expire(channel->efx, 100))
	channel->rfs_filters_added -= 60;
	}
	#define efx_filter_rfs_enabled() 1
	#else
	static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
	#define efx_filter_rfs_enabled() 0
	#endif
	bool efx_filter_is_mc_recipient(const struct efx_filter_spec *spec);

	/* Channels */
	int efx_channel_dummy_op_int(struct efx_channel *channel);
	void efx_channel_dummy_op_void(struct efx_channel *channel);
	int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);

	/* Ports */
	int efx_reconfigure_port(struct efx_nic *efx);
	int __efx_reconfigure_port(struct efx_nic *efx);

	/* Ethtool support */
	extern const struct ethtool_ops efx_ethtool_ops;

	/* Reset handling */
	int efx_reset(struct efx_nic *efx, enum reset_type method);
	void efx_reset_down(struct efx_nic *efx, enum reset_type method);
	int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
	int efx_try_recovery(struct efx_nic *efx);

	/* Global */
	void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
	int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
	unsigned int rx_usecs, bool rx_adaptive,
	bool rx_may_override_tx);
	void efx_get_irq_moderation(struct efx_nic efx, unsigned int tx_usecs,
	unsigned int rx_usecs, bool rx_adaptive);

	/* Dummy PHY ops for PHY drivers */
	int efx_port_dummy_op_int(struct efx_nic *efx);
	void efx_port_dummy_op_void(struct efx_nic *efx);

	/* MTD */
	#ifdef CONFIG_SFC_MTD
	int efx_mtd_add(struct efx_nic efx, struct efx_mtd_partition parts,
	size_t n_parts, size_t sizeof_part);
	static inline int efx_mtd_probe(struct efx_nic *efx)
	{
	return efx->type->mtd_probe(efx);
	}
	void efx_mtd_rename(struct efx_nic *efx);
	void efx_mtd_remove(struct efx_nic *efx);
	#else
	static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
	static inline void efx_mtd_rename(struct efx_nic *efx) {}
	static inline void efx_mtd_remove(struct efx_nic *efx) {}
	#endif

	static inline void efx_schedule_channel(struct efx_channel *channel)
	{
	netif_vdbg(channel->efx, intr, channel->efx->net_dev,
	"channel %d scheduling NAPI poll on CPU%d\n",
	channel->channel, raw_smp_processor_id());

	napi_schedule(&channel->napi_str);
	}

	static inline void efx_schedule_channel_irq(struct efx_channel *channel)
	{
	channel->event_test_cpu = raw_smp_processor_id();
	efx_schedule_channel(channel);
	}

	void efx_link_status_changed(struct efx_nic *efx);
	void efx_link_set_advertising(struct efx_nic *efx, u32);
	void efx_link_set_wanted_fc(struct efx_nic *efx, u8);

	static inline void efx_device_detach_sync(struct efx_nic *efx)
	{
	struct net_device *dev = efx->net_dev;

	/* Lock/freeze all TX queues so that we can be sure the
	* TX scheduler is stopped when we're done and before
	* netif_device_present() becomes false.
	*/
	netif_tx_lock_bh(dev);
	netif_device_detach(dev);
	netif_tx_unlock_bh(dev);
	}

	#endif /* EFX_EFX_H */