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35205b211c
efx_device_detach_sync() locks all TX queues before marking the device
detached and thus disabling further TX scheduling. But it can still
be interrupted by TX completions which then result in TX scheduling in
soft interrupt context. This will deadlock when it tries to acquire
a TX queue lock that efx_device_detach_sync() already acquired.
To avoid deadlock, we must use netif_tx_{,un}lock_bh().
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
180 lines
6.7 KiB
C
180 lines
6.7 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 2006-2010 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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/* 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_init_tx_queue_core_txq(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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extern int efx_setup_tc(struct net_device *net_dev, u8 num_tc);
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extern unsigned int efx_tx_max_skb_descs(struct efx_nic *efx);
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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);
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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, u16 flags);
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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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/* Maximum number of TCP segments we support for soft-TSO */
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#define EFX_TSO_MAX_SEGS 100
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/* The smallest [rt]xq_entries that the driver supports. RX minimum
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* is a bit arbitrary. For TX, we must have space for at least 2
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* TSO skbs.
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*/
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#define EFX_RXQ_MIN_ENT 128U
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#define EFX_TXQ_MIN_ENT(efx) (2 * efx_tx_max_skb_descs(efx))
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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 s32 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_id_safe(struct efx_nic *efx,
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enum efx_filter_priority priority,
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u32 filter_id);
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extern int efx_filter_get_filter_safe(struct efx_nic *efx,
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enum efx_filter_priority priority,
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u32 filter_id, struct efx_filter_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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extern u32 efx_filter_count_rx_used(struct efx_nic *efx,
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enum efx_filter_priority priority);
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extern u32 efx_filter_get_rx_id_limit(struct efx_nic *efx);
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extern s32 efx_filter_get_rx_ids(struct efx_nic *efx,
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enum efx_filter_priority priority,
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u32 *buf, u32 size);
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#ifdef CONFIG_RFS_ACCEL
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extern int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
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u16 rxq_index, u32 flow_id);
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extern bool __efx_filter_rfs_expire(struct efx_nic *efx, unsigned quota);
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static inline void efx_filter_rfs_expire(struct efx_channel *channel)
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{
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if (channel->rfs_filters_added >= 60 &&
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__efx_filter_rfs_expire(channel->efx, 100))
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channel->rfs_filters_added -= 60;
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}
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#define efx_filter_rfs_enabled() 1
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#else
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static inline void efx_filter_rfs_expire(struct efx_channel *channel) {}
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#define efx_filter_rfs_enabled() 0
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#endif
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/* Channels */
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extern int efx_channel_dummy_op_int(struct efx_channel *channel);
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extern void efx_channel_dummy_op_void(struct efx_channel *channel);
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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 int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
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unsigned int rx_usecs, bool rx_adaptive,
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bool rx_may_override_tx);
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extern void efx_get_irq_moderation(struct efx_nic *efx, unsigned int *tx_usecs,
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unsigned 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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static inline void efx_schedule_channel_irq(struct efx_channel *channel)
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{
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channel->event_test_cpu = raw_smp_processor_id();
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efx_schedule_channel(channel);
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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, u8);
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static inline void efx_device_detach_sync(struct efx_nic *efx)
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{
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struct net_device *dev = efx->net_dev;
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/* Lock/freeze all TX queues so that we can be sure the
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* TX scheduler is stopped when we're done and before
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* netif_device_present() becomes false.
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*/
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netif_tx_lock_bh(dev);
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netif_device_detach(dev);
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netif_tx_unlock_bh(dev);
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}
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#endif /* EFX_EFX_H */
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