drivers/net/ethernet/sfc/nic.c - SHIFTPHONES/mainline/linux - Gitiles

 /****************************************************************************
  * 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.
  */

 #include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/seq_file.h>
 #include <linux/cpu_rmap.h>
 #include "net_driver.h"
 #include "bitfield.h"
 #include "efx.h"
 #include "nic.h"
 #include "ef10_regs.h"
 #include "farch_regs.h"
 #include "io.h"
 #include "workarounds.h"

 /**************************************************************************
  *
  * Generic buffer handling
  * These buffers are used for interrupt status, MAC stats, etc.
  *
  **************************************************************************/

 int efx_nic_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer,
 			 unsigned int len, gfp_t gfp_flags)
 {
 	buffer->addr = dma_zalloc_coherent(&efx->pci_dev->dev, len,
 					   &buffer->dma_addr, gfp_flags);
 	if (!buffer->addr)
 		return -ENOMEM;
 	buffer->len = len;
 	return 0;
 }

 void efx_nic_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer)
 {
 	if (buffer->addr) {
 		dma_free_coherent(&efx->pci_dev->dev, buffer->len,
 				  buffer->addr, buffer->dma_addr);
 		buffer->addr = NULL;
 	}
 }

 /* Check whether an event is present in the eventq at the current
  * read pointer.  Only useful for self-test.
  */
 bool efx_nic_event_present(struct efx_channel *channel)
 {
 	return efx_event_present(efx_event(channel, channel->eventq_read_ptr));
 }

 void efx_nic_event_test_start(struct efx_channel *channel)
 {
 	channel->event_test_cpu = -1;
 	smp_wmb();
 	channel->efx->type->ev_test_generate(channel);
 }

 void efx_nic_irq_test_start(struct efx_nic *efx)
 {
 	efx->last_irq_cpu = -1;
 	smp_wmb();
 	efx->type->irq_test_generate(efx);
 }

 /* Hook interrupt handler(s)
  * Try MSI and then legacy interrupts.
  */
 int efx_nic_init_interrupt(struct efx_nic *efx)
 {
 	struct efx_channel *channel;
 	unsigned int n_irqs;
 	int rc;

 	if (!EFX_INT_MODE_USE_MSI(efx)) {
 		rc = request_irq(efx->legacy_irq,
 				 efx->type->irq_handle_legacy, IRQF_SHARED,
 				 efx->name, efx);
 		if (rc) {
 			netif_err(efx, drv, efx->net_dev,
 				  "failed to hook legacy IRQ %d\n",
 				  efx->pci_dev->irq);
 			goto fail1;
 		}
 		return 0;
 	}

 #ifdef CONFIG_RFS_ACCEL
 	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
 		efx->net_dev->rx_cpu_rmap =
 			alloc_irq_cpu_rmap(efx->n_rx_channels);
 		if (!efx->net_dev->rx_cpu_rmap) {
 			rc = -ENOMEM;
 			goto fail1;
 		}
 	}
 #endif

 	/* Hook MSI or MSI-X interrupt */
 	n_irqs = 0;
 	efx_for_each_channel(channel, efx) {
 		rc = request_irq(channel->irq, efx->type->irq_handle_msi,
 				 IRQF_PROBE_SHARED, /* Not shared */
 				 efx->msi_context[channel->channel].name,
 				 &efx->msi_context[channel->channel]);
 		if (rc) {
 			netif_err(efx, drv, efx->net_dev,
 				  "failed to hook IRQ %d\n", channel->irq);
 			goto fail2;
 		}
 		++n_irqs;

 #ifdef CONFIG_RFS_ACCEL
 		if (efx->interrupt_mode == EFX_INT_MODE_MSIX &&
 		    channel->channel < efx->n_rx_channels) {
 			rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap,
 					      channel->irq);
 			if (rc)
 				goto fail2;
 		}
 #endif
 	}

 	return 0;

  fail2:
 #ifdef CONFIG_RFS_ACCEL
 	free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
 	efx->net_dev->rx_cpu_rmap = NULL;
 #endif
 	efx_for_each_channel(channel, efx) {
 		if (n_irqs-- == 0)
 			break;
 		free_irq(channel->irq, &efx->msi_context[channel->channel]);
 	}
  fail1:
 	return rc;
 }

 void efx_nic_fini_interrupt(struct efx_nic *efx)
 {
 	struct efx_channel *channel;

 #ifdef CONFIG_RFS_ACCEL
 	free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
 	efx->net_dev->rx_cpu_rmap = NULL;
 #endif

 	/* Disable MSI/MSI-X interrupts */
 	efx_for_each_channel(channel, efx)
 		free_irq(channel->irq, &efx->msi_context[channel->channel]);

 	/* Disable legacy interrupt */
 	if (efx->legacy_irq)
 		free_irq(efx->legacy_irq, efx);
 }

 /* Register dump */

 #define REGISTER_REVISION_FA	1
 #define REGISTER_REVISION_FB	2
 #define REGISTER_REVISION_FC	3
 #define REGISTER_REVISION_FZ	3	/* last Falcon arch revision */
 #define REGISTER_REVISION_ED	4
 #define REGISTER_REVISION_EZ	4	/* latest EF10 revision */

 struct efx_nic_reg {
 	u32 offset:24;
 	u32 min_revision:3, max_revision:3;
 };

 #define REGISTER(name, arch, min_rev, max_rev) {			\
 	arch ## R_ ## min_rev ## max_rev ## _ ## name,			\
 	REGISTER_REVISION_ ## arch ## min_rev,				\
 	REGISTER_REVISION_ ## arch ## max_rev				\
 }
 #define REGISTER_AA(name) REGISTER(name, F, A, A)
 #define REGISTER_AB(name) REGISTER(name, F, A, B)
 #define REGISTER_AZ(name) REGISTER(name, F, A, Z)
 #define REGISTER_BB(name) REGISTER(name, F, B, B)
 #define REGISTER_BZ(name) REGISTER(name, F, B, Z)
 #define REGISTER_CZ(name) REGISTER(name, F, C, Z)
 #define REGISTER_DZ(name) REGISTER(name, E, D, Z)

 static const struct efx_nic_reg efx_nic_regs[] = {
 	REGISTER_AZ(ADR_REGION),
 	REGISTER_AZ(INT_EN_KER),
 	REGISTER_BZ(INT_EN_CHAR),
 	REGISTER_AZ(INT_ADR_KER),
 	REGISTER_BZ(INT_ADR_CHAR),
 	/* INT_ACK_KER is WO */
 	/* INT_ISR0 is RC */
 	REGISTER_AZ(HW_INIT),
 	REGISTER_CZ(USR_EV_CFG),
 	REGISTER_AB(EE_SPI_HCMD),
 	REGISTER_AB(EE_SPI_HADR),
 	REGISTER_AB(EE_SPI_HDATA),
 	REGISTER_AB(EE_BASE_PAGE),
 	REGISTER_AB(EE_VPD_CFG0),
 	/* EE_VPD_SW_CNTL and EE_VPD_SW_DATA are not used */
 	/* PMBX_DBG_IADDR and PBMX_DBG_IDATA are indirect */
 	/* PCIE_CORE_INDIRECT is indirect */
 	REGISTER_AB(NIC_STAT),
 	REGISTER_AB(GPIO_CTL),
 	REGISTER_AB(GLB_CTL),
 	/* FATAL_INTR_KER and FATAL_INTR_CHAR are partly RC */
 	REGISTER_BZ(DP_CTRL),
 	REGISTER_AZ(MEM_STAT),
 	REGISTER_AZ(CS_DEBUG),
 	REGISTER_AZ(ALTERA_BUILD),
 	REGISTER_AZ(CSR_SPARE),
 	REGISTER_AB(PCIE_SD_CTL0123),
 	REGISTER_AB(PCIE_SD_CTL45),
 	REGISTER_AB(PCIE_PCS_CTL_STAT),
 	/* DEBUG_DATA_OUT is not used */
 	/* DRV_EV is WO */
 	REGISTER_AZ(EVQ_CTL),
 	REGISTER_AZ(EVQ_CNT1),
 	REGISTER_AZ(EVQ_CNT2),
 	REGISTER_AZ(BUF_TBL_CFG),
 	REGISTER_AZ(SRM_RX_DC_CFG),
 	REGISTER_AZ(SRM_TX_DC_CFG),
 	REGISTER_AZ(SRM_CFG),
 	/* BUF_TBL_UPD is WO */
 	REGISTER_AZ(SRM_UPD_EVQ),
 	REGISTER_AZ(SRAM_PARITY),
 	REGISTER_AZ(RX_CFG),
 	REGISTER_BZ(RX_FILTER_CTL),
 	/* RX_FLUSH_DESCQ is WO */
 	REGISTER_AZ(RX_DC_CFG),
 	REGISTER_AZ(RX_DC_PF_WM),
 	REGISTER_BZ(RX_RSS_TKEY),
 	/* RX_NODESC_DROP is RC */
 	REGISTER_AA(RX_SELF_RST),
 	/* RX_DEBUG, RX_PUSH_DROP are not used */
 	REGISTER_CZ(RX_RSS_IPV6_REG1),
 	REGISTER_CZ(RX_RSS_IPV6_REG2),
 	REGISTER_CZ(RX_RSS_IPV6_REG3),
 	/* TX_FLUSH_DESCQ is WO */
 	REGISTER_AZ(TX_DC_CFG),
 	REGISTER_AA(TX_CHKSM_CFG),
 	REGISTER_AZ(TX_CFG),
 	/* TX_PUSH_DROP is not used */
 	REGISTER_AZ(TX_RESERVED),
 	REGISTER_BZ(TX_PACE),
 	/* TX_PACE_DROP_QID is RC */
 	REGISTER_BB(TX_VLAN),
 	REGISTER_BZ(TX_IPFIL_PORTEN),
 	REGISTER_AB(MD_TXD),
 	REGISTER_AB(MD_RXD),
 	REGISTER_AB(MD_CS),
 	REGISTER_AB(MD_PHY_ADR),
 	REGISTER_AB(MD_ID),
 	/* MD_STAT is RC */
 	REGISTER_AB(MAC_STAT_DMA),
 	REGISTER_AB(MAC_CTRL),
 	REGISTER_BB(GEN_MODE),
 	REGISTER_AB(MAC_MC_HASH_REG0),
 	REGISTER_AB(MAC_MC_HASH_REG1),
 	REGISTER_AB(GM_CFG1),
 	REGISTER_AB(GM_CFG2),
 	/* GM_IPG and GM_HD are not used */
 	REGISTER_AB(GM_MAX_FLEN),
 	/* GM_TEST is not used */
 	REGISTER_AB(GM_ADR1),
 	REGISTER_AB(GM_ADR2),
 	REGISTER_AB(GMF_CFG0),
 	REGISTER_AB(GMF_CFG1),
 	REGISTER_AB(GMF_CFG2),
 	REGISTER_AB(GMF_CFG3),
 	REGISTER_AB(GMF_CFG4),
 	REGISTER_AB(GMF_CFG5),
 	REGISTER_BB(TX_SRC_MAC_CTL),
 	REGISTER_AB(XM_ADR_LO),
 	REGISTER_AB(XM_ADR_HI),
 	REGISTER_AB(XM_GLB_CFG),
 	REGISTER_AB(XM_TX_CFG),
 	REGISTER_AB(XM_RX_CFG),
 	REGISTER_AB(XM_MGT_INT_MASK),
 	REGISTER_AB(XM_FC),
 	REGISTER_AB(XM_PAUSE_TIME),
 	REGISTER_AB(XM_TX_PARAM),
 	REGISTER_AB(XM_RX_PARAM),
 	/* XM_MGT_INT_MSK (note no 'A') is RC */
 	REGISTER_AB(XX_PWR_RST),
 	REGISTER_AB(XX_SD_CTL),
 	REGISTER_AB(XX_TXDRV_CTL),
 	/* XX_PRBS_CTL, XX_PRBS_CHK and XX_PRBS_ERR are not used */
 	/* XX_CORE_STAT is partly RC */
 	REGISTER_DZ(BIU_HW_REV_ID),
 	REGISTER_DZ(MC_DB_LWRD),
 	REGISTER_DZ(MC_DB_HWRD),
 };

 struct efx_nic_reg_table {
 	u32 offset:24;
 	u32 min_revision:3, max_revision:3;
 	u32 step:6, rows:21;
 };

 #define REGISTER_TABLE_DIMENSIONS(_, offset, arch, min_rev, max_rev, step, rows) { \
 	offset,								\
 	REGISTER_REVISION_ ## arch ## min_rev,				\
 	REGISTER_REVISION_ ## arch ## max_rev,				\
 	step, rows							\
 }
 #define REGISTER_TABLE(name, arch, min_rev, max_rev)			\
 	REGISTER_TABLE_DIMENSIONS(					\
 		name, arch ## R_ ## min_rev ## max_rev ## _ ## name,	\
 		arch, min_rev, max_rev,					\
 		arch ## R_ ## min_rev ## max_rev ## _ ## name ## _STEP,	\
 		arch ## R_ ## min_rev ## max_rev ## _ ## name ## _ROWS)
 #define REGISTER_TABLE_AA(name) REGISTER_TABLE(name, F, A, A)
 #define REGISTER_TABLE_AZ(name) REGISTER_TABLE(name, F, A, Z)
 #define REGISTER_TABLE_BB(name) REGISTER_TABLE(name, F, B, B)
 #define REGISTER_TABLE_BZ(name) REGISTER_TABLE(name, F, B, Z)
 #define REGISTER_TABLE_BB_CZ(name)					\
 	REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, B, B,	\
 				  FR_BZ_ ## name ## _STEP,		\
 				  FR_BB_ ## name ## _ROWS),		\
 	REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, C, Z,	\
 				  FR_BZ_ ## name ## _STEP,		\
 				  FR_CZ_ ## name ## _ROWS)
 #define REGISTER_TABLE_CZ(name) REGISTER_TABLE(name, F, C, Z)
 #define REGISTER_TABLE_DZ(name) REGISTER_TABLE(name, E, D, Z)

 static const struct efx_nic_reg_table efx_nic_reg_tables[] = {
 	/* DRIVER is not used */
 	/* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */
 	REGISTER_TABLE_BB(TX_IPFIL_TBL),
 	REGISTER_TABLE_BB(TX_SRC_MAC_TBL),
 	REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER),
 	REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL),
 	REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER),
 	REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL),
 	REGISTER_TABLE_AA(EVQ_PTR_TBL_KER),
 	REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL),
 	/* We can't reasonably read all of the buffer table (up to 8MB!).
 	 * However this driver will only use a few entries.  Reading
 	 * 1K entries allows for some expansion of queue count and
 	 * size before we need to change the version. */
 	REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER,
 				  F, A, A, 8, 1024),
 	REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL,
 				  F, B, Z, 8, 1024),
 	REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0),
 	REGISTER_TABLE_BB_CZ(TIMER_TBL),
 	REGISTER_TABLE_BB_CZ(TX_PACE_TBL),
 	REGISTER_TABLE_BZ(RX_INDIRECTION_TBL),
 	/* TX_FILTER_TBL0 is huge and not used by this driver */
 	REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0),
 	REGISTER_TABLE_CZ(MC_TREG_SMEM),
 	/* MSIX_PBA_TABLE is not mapped */
 	/* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */
 	REGISTER_TABLE_BZ(RX_FILTER_TBL0),
 	REGISTER_TABLE_DZ(BIU_MC_SFT_STATUS),
 };

 size_t efx_nic_get_regs_len(struct efx_nic *efx)
 {
 	const struct efx_nic_reg *reg;
 	const struct efx_nic_reg_table *table;
 	size_t len = 0;

 	for (reg = efx_nic_regs;
 	     reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
 	     reg++)
 		if (efx->type->revision >= reg->min_revision &&
 		    efx->type->revision <= reg->max_revision)
 			len += sizeof(efx_oword_t);

 	for (table = efx_nic_reg_tables;
 	     table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
 	     table++)
 		if (efx->type->revision >= table->min_revision &&
 		    efx->type->revision <= table->max_revision)
 			len += table->rows * min_t(size_t, table->step, 16);

 	return len;
 }

 void efx_nic_get_regs(struct efx_nic *efx, void *buf)
 {
 	const struct efx_nic_reg *reg;
 	const struct efx_nic_reg_table *table;

 	for (reg = efx_nic_regs;
 	     reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
 	     reg++) {
 		if (efx->type->revision >= reg->min_revision &&
 		    efx->type->revision <= reg->max_revision) {
 			efx_reado(efx, (efx_oword_t *)buf, reg->offset);
 			buf += sizeof(efx_oword_t);
 		}
 	}

 	for (table = efx_nic_reg_tables;
 	     table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
 	     table++) {
 		size_t size, i;

 		if (!(efx->type->revision >= table->min_revision &&
 		      efx->type->revision <= table->max_revision))
 			continue;

 		size = min_t(size_t, table->step, 16);

 		for (i = 0; i < table->rows; i++) {
 			switch (table->step) {
 			case 4: /* 32-bit SRAM */
 				efx_readd(efx, buf, table->offset + 4 * i);
 				break;
 			case 8: /* 64-bit SRAM */
 				efx_sram_readq(efx,
 					       efx->membase + table->offset,
 					       buf, i);
 				break;
 			case 16: /* 128-bit-readable register */
 				efx_reado_table(efx, buf, table->offset, i);
 				break;
 			case 32: /* 128-bit register, interleaved */
 				efx_reado_table(efx, buf, table->offset, 2 * i);
 				break;
 			default:
 				WARN_ON(1);
 				return;
 			}
 			buf += size;
 		}
 	}
 }

 /**
  * efx_nic_describe_stats - Describe supported statistics for ethtool
  * @desc: Array of &struct efx_hw_stat_desc describing the statistics
  * @count: Length of the @desc array
  * @mask: Bitmask of which elements of @desc are enabled
  * @names: Buffer to copy names to, or %NULL.  The names are copied
  *	starting at intervals of %ETH_GSTRING_LEN bytes.
  *
  * Returns the number of visible statistics, i.e. the number of set
  * bits in the first @count bits of @mask for which a name is defined.
  */
 size_t efx_nic_describe_stats(const struct efx_hw_stat_desc *desc, size_t count,
 			      const unsigned long *mask, u8 *names)
 {
 	size_t visible = 0;
 	size_t index;

 	for_each_set_bit(index, mask, count) {
 		if (desc[index].name) {
 			if (names) {
 				strlcpy(names, desc[index].name,
 					ETH_GSTRING_LEN);
 				names += ETH_GSTRING_LEN;
 			}
 			++visible;
 		}
 	}

 	return visible;
 }

 /**
  * efx_nic_update_stats - Convert statistics DMA buffer to array of u64
  * @desc: Array of &struct efx_hw_stat_desc describing the DMA buffer
  *	layout.  DMA widths of 0, 16, 32 and 64 are supported; where
  *	the width is specified as 0 the corresponding element of
  *	@stats is not updated.
  * @count: Length of the @desc array
  * @mask: Bitmask of which elements of @desc are enabled
  * @stats: Buffer to update with the converted statistics.  The length
  *	of this array must be at least @count.
  * @dma_buf: DMA buffer containing hardware statistics
  * @accumulate: If set, the converted values will be added rather than
  *	directly stored to the corresponding elements of @stats
  */
 void efx_nic_update_stats(const struct efx_hw_stat_desc *desc, size_t count,
 			  const unsigned long *mask,
 			  u64 *stats, const void *dma_buf, bool accumulate)
 {
 	size_t index;

 	for_each_set_bit(index, mask, count) {
 		if (desc[index].dma_width) {
 			const void *addr = dma_buf + desc[index].offset;
 			u64 val;

 			switch (desc[index].dma_width) {
 			case 16:
 				val = le16_to_cpup((__le16 *)addr);
 				break;
 			case 32:
 				val = le32_to_cpup((__le32 *)addr);
 				break;
 			case 64:
 				val = le64_to_cpup((__le64 *)addr);
 				break;
 			default:
 				WARN_ON(1);
 				val = 0;
 				break;
 			}

 			if (accumulate)
 				stats[index] += val;
 			else
 				stats[index] = val;
 		}
 	}
 }

 void efx_nic_fix_nodesc_drop_stat(struct efx_nic *efx, u64 *rx_nodesc_drops)
 {
 	/* if down, or this is the first update after coming up */
 	if (!(efx->net_dev->flags & IFF_UP) || !efx->rx_nodesc_drops_prev_state)
 		efx->rx_nodesc_drops_while_down +=
 			*rx_nodesc_drops - efx->rx_nodesc_drops_total;
 	efx->rx_nodesc_drops_total = *rx_nodesc_drops;
 	efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP);
 	*rx_nodesc_drops -= efx->rx_nodesc_drops_while_down;
 }
	/****************************************************************************
	* 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.
	*/

	#include <linux/bitops.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/pci.h>
	#include <linux/module.h>
	#include <linux/seq_file.h>
	#include <linux/cpu_rmap.h>
	#include "net_driver.h"
	#include "bitfield.h"
	#include "efx.h"
	#include "nic.h"
	#include "ef10_regs.h"
	#include "farch_regs.h"
	#include "io.h"
	#include "workarounds.h"

	/**************************************************************************
	*
	* Generic buffer handling
	* These buffers are used for interrupt status, MAC stats, etc.
	*
	**************************************************************************/

	int efx_nic_alloc_buffer(struct efx_nic efx, struct efx_buffer buffer,
	unsigned int len, gfp_t gfp_flags)
	{
	buffer->addr = dma_zalloc_coherent(&efx->pci_dev->dev, len,
	&buffer->dma_addr, gfp_flags);
	if (!buffer->addr)
	return -ENOMEM;
	buffer->len = len;
	return 0;
	}

	void efx_nic_free_buffer(struct efx_nic efx, struct efx_buffer buffer)
	{
	if (buffer->addr) {
	dma_free_coherent(&efx->pci_dev->dev, buffer->len,
	buffer->addr, buffer->dma_addr);
	buffer->addr = NULL;
	}
	}

	/* Check whether an event is present in the eventq at the current
	* read pointer. Only useful for self-test.
	*/
	bool efx_nic_event_present(struct efx_channel *channel)
	{
	return efx_event_present(efx_event(channel, channel->eventq_read_ptr));
	}

	void efx_nic_event_test_start(struct efx_channel *channel)
	{
	channel->event_test_cpu = -1;
	smp_wmb();
	channel->efx->type->ev_test_generate(channel);
	}

	void efx_nic_irq_test_start(struct efx_nic *efx)
	{
	efx->last_irq_cpu = -1;
	smp_wmb();
	efx->type->irq_test_generate(efx);
	}

	/* Hook interrupt handler(s)
	* Try MSI and then legacy interrupts.
	*/
	int efx_nic_init_interrupt(struct efx_nic *efx)
	{
	struct efx_channel *channel;
	unsigned int n_irqs;
	int rc;

	if (!EFX_INT_MODE_USE_MSI(efx)) {
	rc = request_irq(efx->legacy_irq,
	efx->type->irq_handle_legacy, IRQF_SHARED,
	efx->name, efx);
	if (rc) {
	netif_err(efx, drv, efx->net_dev,
	"failed to hook legacy IRQ %d\n",
	efx->pci_dev->irq);
	goto fail1;
	}
	return 0;
	}

	#ifdef CONFIG_RFS_ACCEL
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
	efx->net_dev->rx_cpu_rmap =
	alloc_irq_cpu_rmap(efx->n_rx_channels);
	if (!efx->net_dev->rx_cpu_rmap) {
	rc = -ENOMEM;
	goto fail1;
	}
	}
	#endif

	/* Hook MSI or MSI-X interrupt */
	n_irqs = 0;
	efx_for_each_channel(channel, efx) {
	rc = request_irq(channel->irq, efx->type->irq_handle_msi,
	IRQF_PROBE_SHARED, /* Not shared */
	efx->msi_context[channel->channel].name,
	&efx->msi_context[channel->channel]);
	if (rc) {
	netif_err(efx, drv, efx->net_dev,
	"failed to hook IRQ %d\n", channel->irq);
	goto fail2;
	}
	++n_irqs;

	#ifdef CONFIG_RFS_ACCEL
	if (efx->interrupt_mode == EFX_INT_MODE_MSIX &&
	channel->channel < efx->n_rx_channels) {
	rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap,
	channel->irq);
	if (rc)
	goto fail2;
	}
	#endif
	}

	return 0;

	fail2:
	#ifdef CONFIG_RFS_ACCEL
	free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
	efx->net_dev->rx_cpu_rmap = NULL;
	#endif
	efx_for_each_channel(channel, efx) {
	if (n_irqs-- == 0)
	break;
	free_irq(channel->irq, &efx->msi_context[channel->channel]);
	}
	fail1:
	return rc;
	}

	void efx_nic_fini_interrupt(struct efx_nic *efx)
	{
	struct efx_channel *channel;

	#ifdef CONFIG_RFS_ACCEL
	free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
	efx->net_dev->rx_cpu_rmap = NULL;
	#endif

	/* Disable MSI/MSI-X interrupts */
	efx_for_each_channel(channel, efx)
	free_irq(channel->irq, &efx->msi_context[channel->channel]);

	/* Disable legacy interrupt */
	if (efx->legacy_irq)
	free_irq(efx->legacy_irq, efx);
	}

	/* Register dump */

	#define REGISTER_REVISION_FA 1
	#define REGISTER_REVISION_FB 2
	#define REGISTER_REVISION_FC 3
	#define REGISTER_REVISION_FZ 3 /* last Falcon arch revision */
	#define REGISTER_REVISION_ED 4
	#define REGISTER_REVISION_EZ 4 /* latest EF10 revision */

	struct efx_nic_reg {
	u32 offset:24;
	u32 min_revision:3, max_revision:3;
	};

	#define REGISTER(name, arch, min_rev, max_rev) { \
	arch ## R_ ## min_rev ## max_rev ## _ ## name, \
	REGISTER_REVISION_ ## arch ## min_rev, \
	REGISTER_REVISION_ ## arch ## max_rev \
	}
	#define REGISTER_AA(name) REGISTER(name, F, A, A)
	#define REGISTER_AB(name) REGISTER(name, F, A, B)
	#define REGISTER_AZ(name) REGISTER(name, F, A, Z)
	#define REGISTER_BB(name) REGISTER(name, F, B, B)
	#define REGISTER_BZ(name) REGISTER(name, F, B, Z)
	#define REGISTER_CZ(name) REGISTER(name, F, C, Z)
	#define REGISTER_DZ(name) REGISTER(name, E, D, Z)

	static const struct efx_nic_reg efx_nic_regs[] = {
	REGISTER_AZ(ADR_REGION),
	REGISTER_AZ(INT_EN_KER),
	REGISTER_BZ(INT_EN_CHAR),
	REGISTER_AZ(INT_ADR_KER),
	REGISTER_BZ(INT_ADR_CHAR),
	/* INT_ACK_KER is WO */
	/* INT_ISR0 is RC */
	REGISTER_AZ(HW_INIT),
	REGISTER_CZ(USR_EV_CFG),
	REGISTER_AB(EE_SPI_HCMD),
	REGISTER_AB(EE_SPI_HADR),
	REGISTER_AB(EE_SPI_HDATA),
	REGISTER_AB(EE_BASE_PAGE),
	REGISTER_AB(EE_VPD_CFG0),
	/* EE_VPD_SW_CNTL and EE_VPD_SW_DATA are not used */
	/* PMBX_DBG_IADDR and PBMX_DBG_IDATA are indirect */
	/* PCIE_CORE_INDIRECT is indirect */
	REGISTER_AB(NIC_STAT),
	REGISTER_AB(GPIO_CTL),
	REGISTER_AB(GLB_CTL),
	/* FATAL_INTR_KER and FATAL_INTR_CHAR are partly RC */
	REGISTER_BZ(DP_CTRL),
	REGISTER_AZ(MEM_STAT),
	REGISTER_AZ(CS_DEBUG),
	REGISTER_AZ(ALTERA_BUILD),
	REGISTER_AZ(CSR_SPARE),
	REGISTER_AB(PCIE_SD_CTL0123),
	REGISTER_AB(PCIE_SD_CTL45),
	REGISTER_AB(PCIE_PCS_CTL_STAT),
	/* DEBUG_DATA_OUT is not used */
	/* DRV_EV is WO */
	REGISTER_AZ(EVQ_CTL),
	REGISTER_AZ(EVQ_CNT1),
	REGISTER_AZ(EVQ_CNT2),
	REGISTER_AZ(BUF_TBL_CFG),
	REGISTER_AZ(SRM_RX_DC_CFG),
	REGISTER_AZ(SRM_TX_DC_CFG),
	REGISTER_AZ(SRM_CFG),
	/* BUF_TBL_UPD is WO */
	REGISTER_AZ(SRM_UPD_EVQ),
	REGISTER_AZ(SRAM_PARITY),
	REGISTER_AZ(RX_CFG),
	REGISTER_BZ(RX_FILTER_CTL),
	/* RX_FLUSH_DESCQ is WO */
	REGISTER_AZ(RX_DC_CFG),
	REGISTER_AZ(RX_DC_PF_WM),
	REGISTER_BZ(RX_RSS_TKEY),
	/* RX_NODESC_DROP is RC */
	REGISTER_AA(RX_SELF_RST),
	/* RX_DEBUG, RX_PUSH_DROP are not used */
	REGISTER_CZ(RX_RSS_IPV6_REG1),
	REGISTER_CZ(RX_RSS_IPV6_REG2),
	REGISTER_CZ(RX_RSS_IPV6_REG3),
	/* TX_FLUSH_DESCQ is WO */
	REGISTER_AZ(TX_DC_CFG),
	REGISTER_AA(TX_CHKSM_CFG),
	REGISTER_AZ(TX_CFG),
	/* TX_PUSH_DROP is not used */
	REGISTER_AZ(TX_RESERVED),
	REGISTER_BZ(TX_PACE),
	/* TX_PACE_DROP_QID is RC */
	REGISTER_BB(TX_VLAN),
	REGISTER_BZ(TX_IPFIL_PORTEN),
	REGISTER_AB(MD_TXD),
	REGISTER_AB(MD_RXD),
	REGISTER_AB(MD_CS),
	REGISTER_AB(MD_PHY_ADR),
	REGISTER_AB(MD_ID),
	/* MD_STAT is RC */
	REGISTER_AB(MAC_STAT_DMA),
	REGISTER_AB(MAC_CTRL),
	REGISTER_BB(GEN_MODE),
	REGISTER_AB(MAC_MC_HASH_REG0),
	REGISTER_AB(MAC_MC_HASH_REG1),
	REGISTER_AB(GM_CFG1),
	REGISTER_AB(GM_CFG2),
	/* GM_IPG and GM_HD are not used */
	REGISTER_AB(GM_MAX_FLEN),
	/* GM_TEST is not used */
	REGISTER_AB(GM_ADR1),
	REGISTER_AB(GM_ADR2),
	REGISTER_AB(GMF_CFG0),
	REGISTER_AB(GMF_CFG1),
	REGISTER_AB(GMF_CFG2),
	REGISTER_AB(GMF_CFG3),
	REGISTER_AB(GMF_CFG4),
	REGISTER_AB(GMF_CFG5),
	REGISTER_BB(TX_SRC_MAC_CTL),
	REGISTER_AB(XM_ADR_LO),
	REGISTER_AB(XM_ADR_HI),
	REGISTER_AB(XM_GLB_CFG),
	REGISTER_AB(XM_TX_CFG),
	REGISTER_AB(XM_RX_CFG),
	REGISTER_AB(XM_MGT_INT_MASK),
	REGISTER_AB(XM_FC),
	REGISTER_AB(XM_PAUSE_TIME),
	REGISTER_AB(XM_TX_PARAM),
	REGISTER_AB(XM_RX_PARAM),
	/* XM_MGT_INT_MSK (note no 'A') is RC */
	REGISTER_AB(XX_PWR_RST),
	REGISTER_AB(XX_SD_CTL),
	REGISTER_AB(XX_TXDRV_CTL),
	/* XX_PRBS_CTL, XX_PRBS_CHK and XX_PRBS_ERR are not used */
	/* XX_CORE_STAT is partly RC */
	REGISTER_DZ(BIU_HW_REV_ID),
	REGISTER_DZ(MC_DB_LWRD),
	REGISTER_DZ(MC_DB_HWRD),
	};

	struct efx_nic_reg_table {
	u32 offset:24;
	u32 min_revision:3, max_revision:3;
	u32 step:6, rows:21;
	};

	#define REGISTER_TABLE_DIMENSIONS(_, offset, arch, min_rev, max_rev, step, rows) { \
	offset, \
	REGISTER_REVISION_ ## arch ## min_rev, \
	REGISTER_REVISION_ ## arch ## max_rev, \
	step, rows \
	}
	#define REGISTER_TABLE(name, arch, min_rev, max_rev) \
	REGISTER_TABLE_DIMENSIONS( \
	name, arch ## R_ ## min_rev ## max_rev ## _ ## name, \
	arch, min_rev, max_rev, \
	arch ## R_ ## min_rev ## max_rev ## _ ## name ## _STEP, \
	arch ## R_ ## min_rev ## max_rev ## _ ## name ## _ROWS)
	#define REGISTER_TABLE_AA(name) REGISTER_TABLE(name, F, A, A)
	#define REGISTER_TABLE_AZ(name) REGISTER_TABLE(name, F, A, Z)
	#define REGISTER_TABLE_BB(name) REGISTER_TABLE(name, F, B, B)
	#define REGISTER_TABLE_BZ(name) REGISTER_TABLE(name, F, B, Z)
	#define REGISTER_TABLE_BB_CZ(name) \
	REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, B, B, \
	FR_BZ_ ## name ## _STEP, \
	FR_BB_ ## name ## _ROWS), \
	REGISTER_TABLE_DIMENSIONS(name, FR_BZ_ ## name, F, C, Z, \
	FR_BZ_ ## name ## _STEP, \
	FR_CZ_ ## name ## _ROWS)
	#define REGISTER_TABLE_CZ(name) REGISTER_TABLE(name, F, C, Z)
	#define REGISTER_TABLE_DZ(name) REGISTER_TABLE(name, E, D, Z)

	static const struct efx_nic_reg_table efx_nic_reg_tables[] = {
	/* DRIVER is not used */
	/* EVQ_RPTR, TIMER_COMMAND, USR_EV and {RX,TX}_DESC_UPD are WO */
	REGISTER_TABLE_BB(TX_IPFIL_TBL),
	REGISTER_TABLE_BB(TX_SRC_MAC_TBL),
	REGISTER_TABLE_AA(RX_DESC_PTR_TBL_KER),
	REGISTER_TABLE_BB_CZ(RX_DESC_PTR_TBL),
	REGISTER_TABLE_AA(TX_DESC_PTR_TBL_KER),
	REGISTER_TABLE_BB_CZ(TX_DESC_PTR_TBL),
	REGISTER_TABLE_AA(EVQ_PTR_TBL_KER),
	REGISTER_TABLE_BB_CZ(EVQ_PTR_TBL),
	/* We can't reasonably read all of the buffer table (up to 8MB!).
	* However this driver will only use a few entries. Reading
	* 1K entries allows for some expansion of queue count and
	* size before we need to change the version. */
	REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL_KER, FR_AA_BUF_FULL_TBL_KER,
	F, A, A, 8, 1024),
	REGISTER_TABLE_DIMENSIONS(BUF_FULL_TBL, FR_BZ_BUF_FULL_TBL,
	F, B, Z, 8, 1024),
	REGISTER_TABLE_CZ(RX_MAC_FILTER_TBL0),
	REGISTER_TABLE_BB_CZ(TIMER_TBL),
	REGISTER_TABLE_BB_CZ(TX_PACE_TBL),
	REGISTER_TABLE_BZ(RX_INDIRECTION_TBL),
	/* TX_FILTER_TBL0 is huge and not used by this driver */
	REGISTER_TABLE_CZ(TX_MAC_FILTER_TBL0),
	REGISTER_TABLE_CZ(MC_TREG_SMEM),
	/* MSIX_PBA_TABLE is not mapped */
	/* SRM_DBG is not mapped (and is redundant with BUF_FLL_TBL) */
	REGISTER_TABLE_BZ(RX_FILTER_TBL0),
	REGISTER_TABLE_DZ(BIU_MC_SFT_STATUS),
	};

	size_t efx_nic_get_regs_len(struct efx_nic *efx)
	{
	const struct efx_nic_reg *reg;
	const struct efx_nic_reg_table *table;
	size_t len = 0;

	for (reg = efx_nic_regs;
	reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
	reg++)
	if (efx->type->revision >= reg->min_revision &&
	efx->type->revision <= reg->max_revision)
	len += sizeof(efx_oword_t);

	for (table = efx_nic_reg_tables;
	table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
	table++)
	if (efx->type->revision >= table->min_revision &&
	efx->type->revision <= table->max_revision)
	len += table->rows * min_t(size_t, table->step, 16);

	return len;
	}

	void efx_nic_get_regs(struct efx_nic efx, void buf)
	{
	const struct efx_nic_reg *reg;
	const struct efx_nic_reg_table *table;

	for (reg = efx_nic_regs;
	reg < efx_nic_regs + ARRAY_SIZE(efx_nic_regs);
	reg++) {
	if (efx->type->revision >= reg->min_revision &&
	efx->type->revision <= reg->max_revision) {
	efx_reado(efx, (efx_oword_t *)buf, reg->offset);
	buf += sizeof(efx_oword_t);
	}
	}

	for (table = efx_nic_reg_tables;
	table < efx_nic_reg_tables + ARRAY_SIZE(efx_nic_reg_tables);
	table++) {
	size_t size, i;

	if (!(efx->type->revision >= table->min_revision &&
	efx->type->revision <= table->max_revision))
	continue;

	size = min_t(size_t, table->step, 16);

	for (i = 0; i < table->rows; i++) {
	switch (table->step) {
	case 4: /* 32-bit SRAM */
	efx_readd(efx, buf, table->offset + 4 * i);
	break;
	case 8: /* 64-bit SRAM */
	efx_sram_readq(efx,
	efx->membase + table->offset,
	buf, i);
	break;
	case 16: /* 128-bit-readable register */
	efx_reado_table(efx, buf, table->offset, i);
	break;
	case 32: /* 128-bit register, interleaved */
	efx_reado_table(efx, buf, table->offset, 2 * i);
	break;
	default:
	WARN_ON(1);
	return;
	}
	buf += size;
	}
	}
	}

	/**
	* efx_nic_describe_stats - Describe supported statistics for ethtool
	* @desc: Array of &struct efx_hw_stat_desc describing the statistics
	* @count: Length of the @desc array
	* @mask: Bitmask of which elements of @desc are enabled
	* @names: Buffer to copy names to, or %NULL. The names are copied
	* starting at intervals of %ETH_GSTRING_LEN bytes.
	*
	* Returns the number of visible statistics, i.e. the number of set
	* bits in the first @count bits of @mask for which a name is defined.
	*/
	size_t efx_nic_describe_stats(const struct efx_hw_stat_desc *desc, size_t count,
	const unsigned long mask, u8 names)
	{
	size_t visible = 0;
	size_t index;

	for_each_set_bit(index, mask, count) {
	if (desc[index].name) {
	if (names) {
	strlcpy(names, desc[index].name,
	ETH_GSTRING_LEN);
	names += ETH_GSTRING_LEN;
	}
	++visible;
	}
	}

	return visible;
	}

	/**
	* efx_nic_update_stats - Convert statistics DMA buffer to array of u64
	* @desc: Array of &struct efx_hw_stat_desc describing the DMA buffer
	* layout. DMA widths of 0, 16, 32 and 64 are supported; where
	* the width is specified as 0 the corresponding element of
	* @stats is not updated.
	* @count: Length of the @desc array
	* @mask: Bitmask of which elements of @desc are enabled
	* @stats: Buffer to update with the converted statistics. The length
	* of this array must be at least @count.
	* @dma_buf: DMA buffer containing hardware statistics
	* @accumulate: If set, the converted values will be added rather than
	* directly stored to the corresponding elements of @stats
	*/
	void efx_nic_update_stats(const struct efx_hw_stat_desc *desc, size_t count,
	const unsigned long *mask,
	u64 stats, const void dma_buf, bool accumulate)
	{
	size_t index;

	for_each_set_bit(index, mask, count) {
	if (desc[index].dma_width) {
	const void *addr = dma_buf + desc[index].offset;
	u64 val;

	switch (desc[index].dma_width) {
	case 16:
	val = le16_to_cpup((__le16 *)addr);
	break;
	case 32:
	val = le32_to_cpup((__le32 *)addr);
	break;
	case 64:
	val = le64_to_cpup((__le64 *)addr);
	break;
	default:
	WARN_ON(1);
	val = 0;
	break;
	}

	if (accumulate)
	stats[index] += val;
	else
	stats[index] = val;
	}
	}
	}

	void efx_nic_fix_nodesc_drop_stat(struct efx_nic efx, u64 rx_nodesc_drops)
	{
	/* if down, or this is the first update after coming up */
	if (!(efx->net_dev->flags & IFF_UP) \|\| !efx->rx_nodesc_drops_prev_state)
	efx->rx_nodesc_drops_while_down +=
	*rx_nodesc_drops - efx->rx_nodesc_drops_total;
	efx->rx_nodesc_drops_total = *rx_nodesc_drops;
	efx->rx_nodesc_drops_prev_state = !!(efx->net_dev->flags & IFF_UP);
	*rx_nodesc_drops -= efx->rx_nodesc_drops_while_down;
	}