c04bfc6b22
Long before this driver went into mainline, it had support for multiple TX queues per port, with lockless TX enabled. Since Linux did not know anything of this, filling up any hardware TX queue would stop the core TX queue and multiple hardware TX queues could fill up before the scheduler reacted. Thus it was necessary to keep a count of how many TX queues were stopped and to wake the core TX queue only when all had free space again. The driver also previously (ab)used the per-hardware-queue stopped flag as a counter to deal with various things that can inhibit TX, but it no longer does that. Remove the per-channel tx_stop_count, tx_stop_lock and per-hardware-queue stopped count and just use the networking core queue state directly. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
131 lines
4.9 KiB
C
131 lines
4.9 KiB
C
/****************************************************************************
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* Driver for Solarflare Solarstorm network controllers and boards
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* Copyright 2005-2006 Fen Systems Ltd.
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* Copyright 2006-2009 Solarflare Communications Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation, incorporated herein by reference.
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*/
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#ifndef EFX_EFX_H
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#define EFX_EFX_H
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#include "net_driver.h"
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#include "filter.h"
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/* PCI IDs */
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#define EFX_VENDID_SFC 0x1924
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#define FALCON_A_P_DEVID 0x0703
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#define FALCON_A_S_DEVID 0x6703
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#define FALCON_B_P_DEVID 0x0710
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#define BETHPAGE_A_P_DEVID 0x0803
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#define SIENA_A_P_DEVID 0x0813
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/* Solarstorm controllers use BAR 0 for I/O space and BAR 2(&3) for memory */
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#define EFX_MEM_BAR 2
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/* TX */
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extern int efx_probe_tx_queue(struct efx_tx_queue *tx_queue);
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extern void efx_remove_tx_queue(struct efx_tx_queue *tx_queue);
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extern void efx_init_tx_queue(struct efx_tx_queue *tx_queue);
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extern void efx_fini_tx_queue(struct efx_tx_queue *tx_queue);
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extern void efx_release_tx_buffers(struct efx_tx_queue *tx_queue);
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extern netdev_tx_t
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efx_hard_start_xmit(struct sk_buff *skb, struct net_device *net_dev);
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extern netdev_tx_t
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efx_enqueue_skb(struct efx_tx_queue *tx_queue, struct sk_buff *skb);
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extern void efx_xmit_done(struct efx_tx_queue *tx_queue, unsigned int index);
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/* RX */
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extern int efx_probe_rx_queue(struct efx_rx_queue *rx_queue);
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extern void efx_remove_rx_queue(struct efx_rx_queue *rx_queue);
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extern void efx_init_rx_queue(struct efx_rx_queue *rx_queue);
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extern void efx_fini_rx_queue(struct efx_rx_queue *rx_queue);
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extern void efx_rx_strategy(struct efx_channel *channel);
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extern void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue);
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extern void efx_rx_slow_fill(unsigned long context);
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extern void __efx_rx_packet(struct efx_channel *channel,
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struct efx_rx_buffer *rx_buf, bool checksummed);
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extern void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
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unsigned int len, bool checksummed, bool discard);
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extern void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue);
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#define EFX_MAX_DMAQ_SIZE 4096UL
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#define EFX_DEFAULT_DMAQ_SIZE 1024UL
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#define EFX_MIN_DMAQ_SIZE 512UL
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#define EFX_MAX_EVQ_SIZE 16384UL
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#define EFX_MIN_EVQ_SIZE 512UL
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/* The smallest [rt]xq_entries that the driver supports. Callers of
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* efx_wake_queue() assume that they can subsequently send at least one
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* skb. Falcon/A1 may require up to three descriptors per skb_frag. */
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#define EFX_MIN_RING_SIZE (roundup_pow_of_two(2 * 3 * MAX_SKB_FRAGS))
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/* Filters */
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extern int efx_probe_filters(struct efx_nic *efx);
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extern void efx_restore_filters(struct efx_nic *efx);
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extern void efx_remove_filters(struct efx_nic *efx);
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extern int efx_filter_insert_filter(struct efx_nic *efx,
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struct efx_filter_spec *spec,
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bool replace);
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extern int efx_filter_remove_filter(struct efx_nic *efx,
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struct efx_filter_spec *spec);
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extern void efx_filter_clear_rx(struct efx_nic *efx,
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enum efx_filter_priority priority);
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/* Channels */
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extern void efx_process_channel_now(struct efx_channel *channel);
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extern int
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efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries);
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/* Ports */
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extern int efx_reconfigure_port(struct efx_nic *efx);
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extern int __efx_reconfigure_port(struct efx_nic *efx);
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/* Ethtool support */
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extern const struct ethtool_ops efx_ethtool_ops;
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/* Reset handling */
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extern int efx_reset(struct efx_nic *efx, enum reset_type method);
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extern void efx_reset_down(struct efx_nic *efx, enum reset_type method);
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extern int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
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/* Global */
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extern void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);
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extern void efx_init_irq_moderation(struct efx_nic *efx, int tx_usecs,
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int rx_usecs, bool rx_adaptive);
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/* Dummy PHY ops for PHY drivers */
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extern int efx_port_dummy_op_int(struct efx_nic *efx);
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extern void efx_port_dummy_op_void(struct efx_nic *efx);
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/* MTD */
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#ifdef CONFIG_SFC_MTD
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extern int efx_mtd_probe(struct efx_nic *efx);
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extern void efx_mtd_rename(struct efx_nic *efx);
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extern void efx_mtd_remove(struct efx_nic *efx);
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#else
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static inline int efx_mtd_probe(struct efx_nic *efx) { return 0; }
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static inline void efx_mtd_rename(struct efx_nic *efx) {}
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static inline void efx_mtd_remove(struct efx_nic *efx) {}
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#endif
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static inline void efx_schedule_channel(struct efx_channel *channel)
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{
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netif_vdbg(channel->efx, intr, channel->efx->net_dev,
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"channel %d scheduling NAPI poll on CPU%d\n",
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channel->channel, raw_smp_processor_id());
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channel->work_pending = true;
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napi_schedule(&channel->napi_str);
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}
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extern void efx_link_status_changed(struct efx_nic *efx);
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extern void efx_link_set_advertising(struct efx_nic *efx, u32);
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extern void efx_link_set_wanted_fc(struct efx_nic *efx, enum efx_fc_type);
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#endif /* EFX_EFX_H */
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