Initial import

1 files changed, 534 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/nic.c b/drivers/net/ethernet/sfc/nic.c
new file mode 100644
index 000000000..89b83e59e
--- /dev/null
+++ b/drivers/net/ethernet/sfc/nic.c
@@ -0,0 +1,534 @@
+/****************************************************************************
+ * 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
+
+	if (EFX_INT_MODE_USE_MSI(efx)) {
+		/* Disable MSI/MSI-X interrupts */
+		efx_for_each_channel(channel, efx)
+			free_irq(channel->irq,
+				 &efx->msi_context[channel->channel]);
+	} else {
+		/* Disable legacy interrupt */
+		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;
+}