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linux-next/drivers/net/ethernet/sfc/efx.h
Alexandre Rames 36763266bb sfc: Add support for busy polling 
This patch adds the sfc driver code for implementing busy polling.
It adds ndo_busy_poll method and locking between it and napi poll.
It also adds each napi to the napi_hash right after netif_napi_add().

Uses efx_start_eventq and efx_stop_eventq in the self tests.

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-22 19:55:20 -07:00

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/****************************************************************************
* 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);
void efx_stop_eventq(struct efx_channel *channel);
void efx_start_eventq(struct efx_channel *channel);
/* 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);
/* Update the generic software stats in the passed stats array */
void efx_update_sw_stats(struct efx_nic *efx, u64 *stats);
/* 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 */
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