/**************************************************************************** * Driver for Solarflare Solarstorm network controllers and boards * Copyright 2005-2006 Fen Systems Ltd. * Copyright 2006-2008 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 #include #include #include #include #include "net_driver.h" #include "bitfield.h" #include "efx.h" #include "mac.h" #include "gmii.h" #include "spi.h" #include "falcon.h" #include "falcon_hwdefs.h" #include "falcon_io.h" #include "mdio_10g.h" #include "phy.h" #include "boards.h" #include "workarounds.h" /* Falcon hardware control. * Falcon is the internal codename for the SFC4000 controller that is * present in SFE400X evaluation boards */ /** * struct falcon_nic_data - Falcon NIC state * @next_buffer_table: First available buffer table id * @pci_dev2: The secondary PCI device if present */ struct falcon_nic_data { unsigned next_buffer_table; struct pci_dev *pci_dev2; }; /************************************************************************** * * Configurable values * ************************************************************************** */ static int disable_dma_stats; /* This is set to 16 for a good reason. In summary, if larger than * 16, the descriptor cache holds more than a default socket * buffer's worth of packets (for UDP we can only have at most one * socket buffer's worth outstanding). This combined with the fact * that we only get 1 TX event per descriptor cache means the NIC * goes idle. */ #define TX_DC_ENTRIES 16 #define TX_DC_ENTRIES_ORDER 0 #define TX_DC_BASE 0x130000 #define RX_DC_ENTRIES 64 #define RX_DC_ENTRIES_ORDER 2 #define RX_DC_BASE 0x100000 /* RX FIFO XOFF watermark * * When the amount of the RX FIFO increases used increases past this * watermark send XOFF. Only used if RX flow control is enabled (ethtool -A) * This also has an effect on RX/TX arbitration */ static int rx_xoff_thresh_bytes = -1; module_param(rx_xoff_thresh_bytes, int, 0644); MODULE_PARM_DESC(rx_xoff_thresh_bytes, "RX fifo XOFF threshold"); /* RX FIFO XON watermark * * When the amount of the RX FIFO used decreases below this * watermark send XON. Only used if TX flow control is enabled (ethtool -A) * This also has an effect on RX/TX arbitration */ static int rx_xon_thresh_bytes = -1; module_param(rx_xon_thresh_bytes, int, 0644); MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold"); /* TX descriptor ring size - min 512 max 4k */ #define FALCON_TXD_RING_ORDER TX_DESCQ_SIZE_1K #define FALCON_TXD_RING_SIZE 1024 #define FALCON_TXD_RING_MASK (FALCON_TXD_RING_SIZE - 1) /* RX descriptor ring size - min 512 max 4k */ #define FALCON_RXD_RING_ORDER RX_DESCQ_SIZE_1K #define FALCON_RXD_RING_SIZE 1024 #define FALCON_RXD_RING_MASK (FALCON_RXD_RING_SIZE - 1) /* Event queue size - max 32k */ #define FALCON_EVQ_ORDER EVQ_SIZE_4K #define FALCON_EVQ_SIZE 4096 #define FALCON_EVQ_MASK (FALCON_EVQ_SIZE - 1) /* Max number of internal errors. After this resets will not be performed */ #define FALCON_MAX_INT_ERRORS 4 /* Maximum period that we wait for flush events. If the flush event * doesn't arrive in this period of time then we check if the queue * was disabled anyway. */ #define FALCON_FLUSH_TIMEOUT 10 /* 10ms */ /************************************************************************** * * Falcon constants * ************************************************************************** */ /* DMA address mask (up to 46-bit, avoiding compiler warnings) * * Note that it is possible to have a platform with 64-bit longs and * 32-bit DMA addresses, or vice versa. EFX_DMA_MASK takes care of the * platform DMA mask. */ #if BITS_PER_LONG == 64 #define FALCON_DMA_MASK EFX_DMA_MASK(0x00003fffffffffffUL) #else #define FALCON_DMA_MASK EFX_DMA_MASK(0x00003fffffffffffULL) #endif /* TX DMA length mask (13-bit) */ #define FALCON_TX_DMA_MASK (4096 - 1) /* Size and alignment of special buffers (4KB) */ #define FALCON_BUF_SIZE 4096 /* Dummy SRAM size code */ #define SRM_NB_BSZ_ONCHIP_ONLY (-1) /* Be nice if these (or equiv.) were in linux/pci_regs.h, but they're not. */ #define PCI_EXP_DEVCAP_PWR_VAL_LBN 18 #define PCI_EXP_DEVCAP_PWR_SCL_LBN 26 #define PCI_EXP_DEVCTL_PAYLOAD_LBN 5 #define PCI_EXP_LNKSTA_LNK_WID 0x3f0 #define PCI_EXP_LNKSTA_LNK_WID_LBN 4 #define FALCON_IS_DUAL_FUNC(efx) \ (FALCON_REV(efx) < FALCON_REV_B0) /************************************************************************** * * Falcon hardware access * **************************************************************************/ /* Read the current event from the event queue */ static inline efx_qword_t *falcon_event(struct efx_channel *channel, unsigned int index) { return (((efx_qword_t *) (channel->eventq.addr)) + index); } /* See if an event is present * * We check both the high and low dword of the event for all ones. We * wrote all ones when we cleared the event, and no valid event can * have all ones in either its high or low dwords. This approach is * robust against reordering. * * Note that using a single 64-bit comparison is incorrect; even * though the CPU read will be atomic, the DMA write may not be. */ static inline int falcon_event_present(efx_qword_t *event) { return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) | EFX_DWORD_IS_ALL_ONES(event->dword[1]))); } /************************************************************************** * * I2C bus - this is a bit-bashing interface using GPIO pins * Note that it uses the output enables to tristate the outputs * SDA is the data pin and SCL is the clock * ************************************************************************** */ static void falcon_setsdascl(struct efx_i2c_interface *i2c) { efx_oword_t reg; falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER); EFX_SET_OWORD_FIELD(reg, GPIO0_OEN, (i2c->scl ? 0 : 1)); EFX_SET_OWORD_FIELD(reg, GPIO3_OEN, (i2c->sda ? 0 : 1)); falcon_write(i2c->efx, ®, GPIO_CTL_REG_KER); } static int falcon_getsda(struct efx_i2c_interface *i2c) { efx_oword_t reg; falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER); return EFX_OWORD_FIELD(reg, GPIO3_IN); } static int falcon_getscl(struct efx_i2c_interface *i2c) { efx_oword_t reg; falcon_read(i2c->efx, ®, GPIO_CTL_REG_KER); return EFX_DWORD_FIELD(reg, GPIO0_IN); } static struct efx_i2c_bit_operations falcon_i2c_bit_operations = { .setsda = falcon_setsdascl, .setscl = falcon_setsdascl, .getsda = falcon_getsda, .getscl = falcon_getscl, .udelay = 100, .mdelay = 10, }; /************************************************************************** * * Falcon special buffer handling * Special buffers are used for event queues and the TX and RX * descriptor rings. * *************************************************************************/ /* * Initialise a Falcon special buffer * * This will define a buffer (previously allocated via * falcon_alloc_special_buffer()) in Falcon's buffer table, allowing * it to be used for event queues, descriptor rings etc. */ static int falcon_init_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer) { efx_qword_t buf_desc; int index; dma_addr_t dma_addr; int i; EFX_BUG_ON_PARANOID(!buffer->addr); /* Write buffer descriptors to NIC */ for (i = 0; i < buffer->entries; i++) { index = buffer->index + i; dma_addr = buffer->dma_addr + (i * 4096); EFX_LOG(efx, "mapping special buffer %d at %llx\n", index, (unsigned long long)dma_addr); EFX_POPULATE_QWORD_4(buf_desc, IP_DAT_BUF_SIZE, IP_DAT_BUF_SIZE_4K, BUF_ADR_REGION, 0, BUF_ADR_FBUF, (dma_addr >> 12), BUF_OWNER_ID_FBUF, 0); falcon_write_sram(efx, &buf_desc, index); } return 0; } /* Unmaps a buffer from Falcon and clears the buffer table entries */ static void falcon_fini_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer) { efx_oword_t buf_tbl_upd; unsigned int start = buffer->index; unsigned int end = (buffer->index + buffer->entries - 1); if (!buffer->entries) return; EFX_LOG(efx, "unmapping special buffers %d-%d\n", buffer->index, buffer->index + buffer->entries - 1); EFX_POPULATE_OWORD_4(buf_tbl_upd, BUF_UPD_CMD, 0, BUF_CLR_CMD, 1, BUF_CLR_END_ID, end, BUF_CLR_START_ID, start); falcon_write(efx, &buf_tbl_upd, BUF_TBL_UPD_REG_KER); } /* * Allocate a new Falcon special buffer * * This allocates memory for a new buffer, clears it and allocates a * new buffer ID range. It does not write into Falcon's buffer table. * * This call will allocate 4KB buffers, since Falcon can't use 8KB * buffers for event queues and descriptor rings. */ static int falcon_alloc_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer, unsigned int len) { struct falcon_nic_data *nic_data = efx->nic_data; len = ALIGN(len, FALCON_BUF_SIZE); buffer->addr = pci_alloc_consistent(efx->pci_dev, len, &buffer->dma_addr); if (!buffer->addr) return -ENOMEM; buffer->len = len; buffer->entries = len / FALCON_BUF_SIZE; BUG_ON(buffer->dma_addr & (FALCON_BUF_SIZE - 1)); /* All zeros is a potentially valid event so memset to 0xff */ memset(buffer->addr, 0xff, len); /* Select new buffer ID */ buffer->index = nic_data->next_buffer_table; nic_data->next_buffer_table += buffer->entries; EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x " "(virt %p phys %lx)\n", buffer->index, buffer->index + buffer->entries - 1, (unsigned long long)buffer->dma_addr, len, buffer->addr, virt_to_phys(buffer->addr)); return 0; } static void falcon_free_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer) { if (!buffer->addr) return; EFX_LOG(efx, "deallocating special buffers %d-%d at %llx+%x " "(virt %p phys %lx)\n", buffer->index, buffer->index + buffer->entries - 1, (unsigned long long)buffer->dma_addr, buffer->len, buffer->addr, virt_to_phys(buffer->addr)); pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr, buffer->dma_addr); buffer->addr = NULL; buffer->entries = 0; } /************************************************************************** * * Falcon generic buffer handling * These buffers are used for interrupt status and MAC stats * **************************************************************************/ static int falcon_alloc_buffer(struct efx_nic *efx, struct efx_buffer *buffer, unsigned int len) { buffer->addr = pci_alloc_consistent(efx->pci_dev, len, &buffer->dma_addr); if (!buffer->addr) return -ENOMEM; buffer->len = len; memset(buffer->addr, 0, len); return 0; } static void falcon_free_buffer(struct efx_nic *efx, struct efx_buffer *buffer) { if (buffer->addr) { pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr, buffer->dma_addr); buffer->addr = NULL; } } /************************************************************************** * * Falcon TX path * **************************************************************************/ /* Returns a pointer to the specified transmit descriptor in the TX * descriptor queue belonging to the specified channel. */ static inline efx_qword_t *falcon_tx_desc(struct efx_tx_queue *tx_queue, unsigned int index) { return (((efx_qword_t *) (tx_queue->txd.addr)) + index); } /* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */ static inline void falcon_notify_tx_desc(struct efx_tx_queue *tx_queue) { unsigned write_ptr; efx_dword_t reg; write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK; EFX_POPULATE_DWORD_1(reg, TX_DESC_WPTR_DWORD, write_ptr); falcon_writel_page(tx_queue->efx, ®, TX_DESC_UPD_REG_KER_DWORD, tx_queue->queue); } /* For each entry inserted into the software descriptor ring, create a * descriptor in the hardware TX descriptor ring (in host memory), and * write a doorbell. */ void falcon_push_buffers(struct efx_tx_queue *tx_queue) { struct efx_tx_buffer *buffer; efx_qword_t *txd; unsigned write_ptr; BUG_ON(tx_queue->write_count == tx_queue->insert_count); do { write_ptr = tx_queue->write_count & FALCON_TXD_RING_MASK; buffer = &tx_queue->buffer[write_ptr]; txd = falcon_tx_desc(tx_queue, write_ptr); ++tx_queue->write_count; /* Create TX descriptor ring entry */ EFX_POPULATE_QWORD_5(*txd, TX_KER_PORT, 0, TX_KER_CONT, buffer->continuation, TX_KER_BYTE_CNT, buffer->len, TX_KER_BUF_REGION, 0, TX_KER_BUF_ADR, buffer->dma_addr); } while (tx_queue->write_count != tx_queue->insert_count); wmb(); /* Ensure descriptors are written before they are fetched */ falcon_notify_tx_desc(tx_queue); } /* Allocate hardware resources for a TX queue */ int falcon_probe_tx(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; return falcon_alloc_special_buffer(efx, &tx_queue->txd, FALCON_TXD_RING_SIZE * sizeof(efx_qword_t)); } int falcon_init_tx(struct efx_tx_queue *tx_queue) { efx_oword_t tx_desc_ptr; struct efx_nic *efx = tx_queue->efx; int rc; /* Pin TX descriptor ring */ rc = falcon_init_special_buffer(efx, &tx_queue->txd); if (rc) return rc; /* Push TX descriptor ring to card */ EFX_POPULATE_OWORD_10(tx_desc_ptr, TX_DESCQ_EN, 1, TX_ISCSI_DDIG_EN, 0, TX_ISCSI_HDIG_EN, 0, TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index, TX_DESCQ_EVQ_ID, tx_queue->channel->evqnum, TX_DESCQ_OWNER_ID, 0, TX_DESCQ_LABEL, tx_queue->queue, TX_DESCQ_SIZE, FALCON_TXD_RING_ORDER, TX_DESCQ_TYPE, 0, TX_NON_IP_DROP_DIS_B0, 1); if (FALCON_REV(efx) >= FALCON_REV_B0) { int csum = !(efx->net_dev->features & NETIF_F_IP_CSUM); EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_IP_CHKSM_DIS_B0, csum); EFX_SET_OWORD_FIELD(tx_desc_ptr, TX_TCP_CHKSM_DIS_B0, csum); } falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base, tx_queue->queue); if (FALCON_REV(efx) < FALCON_REV_B0) { efx_oword_t reg; BUG_ON(tx_queue->queue >= 128); /* HW limit */ falcon_read(efx, ®, TX_CHKSM_CFG_REG_KER_A1); if (efx->net_dev->features & NETIF_F_IP_CSUM) clear_bit_le(tx_queue->queue, (void *)®); else set_bit_le(tx_queue->queue, (void *)®); falcon_write(efx, ®, TX_CHKSM_CFG_REG_KER_A1); } return 0; } static int falcon_flush_tx_queue(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; struct efx_channel *channel = &efx->channel[0]; efx_oword_t tx_flush_descq; unsigned int read_ptr, i; /* Post a flush command */ EFX_POPULATE_OWORD_2(tx_flush_descq, TX_FLUSH_DESCQ_CMD, 1, TX_FLUSH_DESCQ, tx_queue->queue); falcon_write(efx, &tx_flush_descq, TX_FLUSH_DESCQ_REG_KER); msleep(FALCON_FLUSH_TIMEOUT); if (EFX_WORKAROUND_7803(efx)) return 0; /* Look for a flush completed event */ read_ptr = channel->eventq_read_ptr; for (i = 0; i < FALCON_EVQ_SIZE; ++i) { efx_qword_t *event = falcon_event(channel, read_ptr); int ev_code, ev_sub_code, ev_queue; if (!falcon_event_present(event)) break; ev_code = EFX_QWORD_FIELD(*event, EV_CODE); ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE); ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_TX_DESCQ_ID); if ((ev_sub_code == TX_DESCQ_FLS_DONE_EV_DECODE) && (ev_queue == tx_queue->queue)) { EFX_LOG(efx, "tx queue %d flush command succesful\n", tx_queue->queue); return 0; } read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK; } if (EFX_WORKAROUND_11557(efx)) { efx_oword_t reg; int enabled; falcon_read_table(efx, ®, efx->type->txd_ptr_tbl_base, tx_queue->queue); enabled = EFX_OWORD_FIELD(reg, TX_DESCQ_EN); if (!enabled) { EFX_LOG(efx, "tx queue %d disabled without a " "flush event seen\n", tx_queue->queue); return 0; } } EFX_ERR(efx, "tx queue %d flush command timed out\n", tx_queue->queue); return -ETIMEDOUT; } void falcon_fini_tx(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; efx_oword_t tx_desc_ptr; /* Stop the hardware using the queue */ if (falcon_flush_tx_queue(tx_queue)) EFX_ERR(efx, "failed to flush tx queue %d\n", tx_queue->queue); /* Remove TX descriptor ring from card */ EFX_ZERO_OWORD(tx_desc_ptr); falcon_write_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base, tx_queue->queue); /* Unpin TX descriptor ring */ falcon_fini_special_buffer(efx, &tx_queue->txd); } /* Free buffers backing TX queue */ void falcon_remove_tx(struct efx_tx_queue *tx_queue) { falcon_free_special_buffer(tx_queue->efx, &tx_queue->txd); } /************************************************************************** * * Falcon RX path * **************************************************************************/ /* Returns a pointer to the specified descriptor in the RX descriptor queue */ static inline efx_qword_t *falcon_rx_desc(struct efx_rx_queue *rx_queue, unsigned int index) { return (((efx_qword_t *) (rx_queue->rxd.addr)) + index); } /* This creates an entry in the RX descriptor queue */ static inline void falcon_build_rx_desc(struct efx_rx_queue *rx_queue, unsigned index) { struct efx_rx_buffer *rx_buf; efx_qword_t *rxd; rxd = falcon_rx_desc(rx_queue, index); rx_buf = efx_rx_buffer(rx_queue, index); EFX_POPULATE_QWORD_3(*rxd, RX_KER_BUF_SIZE, rx_buf->len - rx_queue->efx->type->rx_buffer_padding, RX_KER_BUF_REGION, 0, RX_KER_BUF_ADR, rx_buf->dma_addr); } /* This writes to the RX_DESC_WPTR register for the specified receive * descriptor ring. */ void falcon_notify_rx_desc(struct efx_rx_queue *rx_queue) { efx_dword_t reg; unsigned write_ptr; while (rx_queue->notified_count != rx_queue->added_count) { falcon_build_rx_desc(rx_queue, rx_queue->notified_count & FALCON_RXD_RING_MASK); ++rx_queue->notified_count; } wmb(); write_ptr = rx_queue->added_count & FALCON_RXD_RING_MASK; EFX_POPULATE_DWORD_1(reg, RX_DESC_WPTR_DWORD, write_ptr); falcon_writel_page(rx_queue->efx, ®, RX_DESC_UPD_REG_KER_DWORD, rx_queue->queue); } int falcon_probe_rx(struct efx_rx_queue *rx_queue) { struct efx_nic *efx = rx_queue->efx; return falcon_alloc_special_buffer(efx, &rx_queue->rxd, FALCON_RXD_RING_SIZE * sizeof(efx_qword_t)); } int falcon_init_rx(struct efx_rx_queue *rx_queue) { efx_oword_t rx_desc_ptr; struct efx_nic *efx = rx_queue->efx; int rc; int is_b0 = FALCON_REV(efx) >= FALCON_REV_B0; int iscsi_digest_en = is_b0; EFX_LOG(efx, "RX queue %d ring in special buffers %d-%d\n", rx_queue->queue, rx_queue->rxd.index, rx_queue->rxd.index + rx_queue->rxd.entries - 1); /* Pin RX descriptor ring */ rc = falcon_init_special_buffer(efx, &rx_queue->rxd); if (rc) return rc; /* Push RX descriptor ring to card */ EFX_POPULATE_OWORD_10(rx_desc_ptr, RX_ISCSI_DDIG_EN, iscsi_digest_en, RX_ISCSI_HDIG_EN, iscsi_digest_en, RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index, RX_DESCQ_EVQ_ID, rx_queue->channel->evqnum, RX_DESCQ_OWNER_ID, 0, RX_DESCQ_LABEL, rx_queue->queue, RX_DESCQ_SIZE, FALCON_RXD_RING_ORDER, RX_DESCQ_TYPE, 0 /* kernel queue */ , /* For >=B0 this is scatter so disable */ RX_DESCQ_JUMBO, !is_b0, RX_DESCQ_EN, 1); falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, rx_queue->queue); return 0; } static int falcon_flush_rx_queue(struct efx_rx_queue *rx_queue) { struct efx_nic *efx = rx_queue->efx; struct efx_channel *channel = &efx->channel[0]; unsigned int read_ptr, i; efx_oword_t rx_flush_descq; /* Post a flush command */ EFX_POPULATE_OWORD_2(rx_flush_descq, RX_FLUSH_DESCQ_CMD, 1, RX_FLUSH_DESCQ, rx_queue->queue); falcon_write(efx, &rx_flush_descq, RX_FLUSH_DESCQ_REG_KER); msleep(FALCON_FLUSH_TIMEOUT); if (EFX_WORKAROUND_7803(efx)) return 0; /* Look for a flush completed event */ read_ptr = channel->eventq_read_ptr; for (i = 0; i < FALCON_EVQ_SIZE; ++i) { efx_qword_t *event = falcon_event(channel, read_ptr); int ev_code, ev_sub_code, ev_queue, ev_failed; if (!falcon_event_present(event)) break; ev_code = EFX_QWORD_FIELD(*event, EV_CODE); ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE); ev_queue = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_DESCQ_ID); ev_failed = EFX_QWORD_FIELD(*event, DRIVER_EV_RX_FLUSH_FAIL); if ((ev_sub_code == RX_DESCQ_FLS_DONE_EV_DECODE) && (ev_queue == rx_queue->queue)) { if (ev_failed) { EFX_INFO(efx, "rx queue %d flush command " "failed\n", rx_queue->queue); return -EAGAIN; } else { EFX_LOG(efx, "rx queue %d flush command " "succesful\n", rx_queue->queue); return 0; } } read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK; } if (EFX_WORKAROUND_11557(efx)) { efx_oword_t reg; int enabled; falcon_read_table(efx, ®, efx->type->rxd_ptr_tbl_base, rx_queue->queue); enabled = EFX_OWORD_FIELD(reg, RX_DESCQ_EN); if (!enabled) { EFX_LOG(efx, "rx queue %d disabled without a " "flush event seen\n", rx_queue->queue); return 0; } } EFX_ERR(efx, "rx queue %d flush command timed out\n", rx_queue->queue); return -ETIMEDOUT; } void falcon_fini_rx(struct efx_rx_queue *rx_queue) { efx_oword_t rx_desc_ptr; struct efx_nic *efx = rx_queue->efx; int i, rc; /* Try and flush the rx queue. This may need to be repeated */ for (i = 0; i < 5; i++) { rc = falcon_flush_rx_queue(rx_queue); if (rc == -EAGAIN) continue; break; } if (rc) EFX_ERR(efx, "failed to flush rx queue %d\n", rx_queue->queue); /* Remove RX descriptor ring from card */ EFX_ZERO_OWORD(rx_desc_ptr); falcon_write_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, rx_queue->queue); /* Unpin RX descriptor ring */ falcon_fini_special_buffer(efx, &rx_queue->rxd); } /* Free buffers backing RX queue */ void falcon_remove_rx(struct efx_rx_queue *rx_queue) { falcon_free_special_buffer(rx_queue->efx, &rx_queue->rxd); } /************************************************************************** * * Falcon event queue processing * Event queues are processed by per-channel tasklets. * **************************************************************************/ /* Update a channel's event queue's read pointer (RPTR) register * * This writes the EVQ_RPTR_REG register for the specified channel's * event queue. * * Note that EVQ_RPTR_REG contains the index of the "last read" event, * whereas channel->eventq_read_ptr contains the index of the "next to * read" event. */ void falcon_eventq_read_ack(struct efx_channel *channel) { efx_dword_t reg; struct efx_nic *efx = channel->efx; EFX_POPULATE_DWORD_1(reg, EVQ_RPTR_DWORD, channel->eventq_read_ptr); falcon_writel_table(efx, ®, efx->type->evq_rptr_tbl_base, channel->evqnum); } /* Use HW to insert a SW defined event */ void falcon_generate_event(struct efx_channel *channel, efx_qword_t *event) { efx_oword_t drv_ev_reg; EFX_POPULATE_OWORD_2(drv_ev_reg, DRV_EV_QID, channel->evqnum, DRV_EV_DATA, EFX_QWORD_FIELD64(*event, WHOLE_EVENT)); falcon_write(channel->efx, &drv_ev_reg, DRV_EV_REG_KER); } /* Handle a transmit completion event * * Falcon batches TX completion events; the message we receive is of * the form "complete all TX events up to this index". */ static inline void falcon_handle_tx_event(struct efx_channel *channel, efx_qword_t *event) { unsigned int tx_ev_desc_ptr; unsigned int tx_ev_q_label; struct efx_tx_queue *tx_queue; struct efx_nic *efx = channel->efx; if (likely(EFX_QWORD_FIELD(*event, TX_EV_COMP))) { /* Transmit completion */ tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, TX_EV_DESC_PTR); tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL); tx_queue = &efx->tx_queue[tx_ev_q_label]; efx_xmit_done(tx_queue, tx_ev_desc_ptr); } else if (EFX_QWORD_FIELD(*event, TX_EV_WQ_FF_FULL)) { /* Rewrite the FIFO write pointer */ tx_ev_q_label = EFX_QWORD_FIELD(*event, TX_EV_Q_LABEL); tx_queue = &efx->tx_queue[tx_ev_q_label]; if (NET_DEV_REGISTERED(efx)) netif_tx_lock(efx->net_dev); falcon_notify_tx_desc(tx_queue); if (NET_DEV_REGISTERED(efx)) netif_tx_unlock(efx->net_dev); } else if (EFX_QWORD_FIELD(*event, TX_EV_PKT_ERR) && EFX_WORKAROUND_10727(efx)) { efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH); } else { EFX_ERR(efx, "channel %d unexpected TX event " EFX_QWORD_FMT"\n", channel->channel, EFX_QWORD_VAL(*event)); } } /* Check received packet's destination MAC address. */ static int check_dest_mac(struct efx_rx_queue *rx_queue, const efx_qword_t *event) { struct efx_rx_buffer *rx_buf; struct efx_nic *efx = rx_queue->efx; int rx_ev_desc_ptr; struct ethhdr *eh; if (efx->promiscuous) return 1; rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR); rx_buf = efx_rx_buffer(rx_queue, rx_ev_desc_ptr); eh = (struct ethhdr *)rx_buf->data; if (memcmp(eh->h_dest, efx->net_dev->dev_addr, ETH_ALEN)) return 0; return 1; } /* Detect errors included in the rx_evt_pkt_ok bit. */ static void falcon_handle_rx_not_ok(struct efx_rx_queue *rx_queue, const efx_qword_t *event, unsigned *rx_ev_pkt_ok, int *discard, int byte_count) { struct efx_nic *efx = rx_queue->efx; unsigned rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err; unsigned rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err; unsigned rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc; unsigned rx_ev_pkt_type, rx_ev_other_err, rx_ev_pause_frm; unsigned rx_ev_ip_frag_err, rx_ev_hdr_type, rx_ev_mcast_pkt; int snap, non_ip; rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE); rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT); rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, RX_EV_TOBE_DISC); rx_ev_pkt_type = EFX_QWORD_FIELD(*event, RX_EV_PKT_TYPE); rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event, RX_EV_BUF_OWNER_ID_ERR); rx_ev_ip_frag_err = EFX_QWORD_FIELD(*event, RX_EV_IF_FRAG_ERR); rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event, RX_EV_IP_HDR_CHKSUM_ERR); rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event, RX_EV_TCP_UDP_CHKSUM_ERR); rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, RX_EV_ETH_CRC_ERR); rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, RX_EV_FRM_TRUNC); rx_ev_drib_nib = ((FALCON_REV(efx) >= FALCON_REV_B0) ? 0 : EFX_QWORD_FIELD(*event, RX_EV_DRIB_NIB)); rx_ev_pause_frm = EFX_QWORD_FIELD(*event, RX_EV_PAUSE_FRM_ERR); /* Every error apart from tobe_disc and pause_frm */ rx_ev_other_err = (rx_ev_drib_nib | rx_ev_tcp_udp_chksum_err | rx_ev_buf_owner_id_err | rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_ip_hdr_chksum_err); snap = (rx_ev_pkt_type == RX_EV_PKT_TYPE_LLC_DECODE) || (rx_ev_pkt_type == RX_EV_PKT_TYPE_VLAN_LLC_DECODE); non_ip = (rx_ev_hdr_type == RX_EV_HDR_TYPE_NON_IP_DECODE); /* SFC bug 5475/8970: The Falcon XMAC incorrectly calculates the * length field of an LLC frame, which sets TOBE_DISC. We could set * PASS_LEN_ERR, but we want the MAC to filter out short frames (to * protect the RX block). * * bug5475 - LLC/SNAP: Falcon identifies SNAP packets. * bug8970 - LLC/noSNAP: Falcon does not provide an LLC flag. * LLC can't encapsulate IP, so by definition * these packets are NON_IP. * * Unicast mismatch will also cause TOBE_DISC, so the driver needs * to check this. */ if (EFX_WORKAROUND_5475(efx) && rx_ev_tobe_disc && (snap || non_ip)) { /* If all the other flags are zero then we can state the * entire packet is ok, which will flag to the kernel not * to recalculate checksums. */ if (!(non_ip | rx_ev_other_err | rx_ev_pause_frm)) *rx_ev_pkt_ok = 1; rx_ev_tobe_disc = 0; /* TOBE_DISC is set for unicast mismatch. But given that * we can't trust TOBE_DISC here, we must validate the dest * MAC address ourselves. */ if (!rx_ev_mcast_pkt && !check_dest_mac(rx_queue, event)) rx_ev_tobe_disc = 1; } /* Count errors that are not in MAC stats. */ if (rx_ev_frm_trunc) ++rx_queue->channel->n_rx_frm_trunc; else if (rx_ev_tobe_disc) ++rx_queue->channel->n_rx_tobe_disc; else if (rx_ev_ip_hdr_chksum_err) ++rx_queue->channel->n_rx_ip_hdr_chksum_err; else if (rx_ev_tcp_udp_chksum_err) ++rx_queue->channel->n_rx_tcp_udp_chksum_err; if (rx_ev_ip_frag_err) ++rx_queue->channel->n_rx_ip_frag_err; /* The frame must be discarded if any of these are true. */ *discard = (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib | rx_ev_tobe_disc | rx_ev_pause_frm); /* TOBE_DISC is expected on unicast mismatches; don't print out an * error message. FRM_TRUNC indicates RXDP dropped the packet due * to a FIFO overflow. */ #ifdef EFX_ENABLE_DEBUG if (rx_ev_other_err) { EFX_INFO_RL(efx, " RX queue %d unexpected RX event " EFX_QWORD_FMT "%s%s%s%s%s%s%s%s%s\n", rx_queue->queue, EFX_QWORD_VAL(*event), rx_ev_buf_owner_id_err ? " [OWNER_ID_ERR]" : "", rx_ev_ip_hdr_chksum_err ? " [IP_HDR_CHKSUM_ERR]" : "", rx_ev_tcp_udp_chksum_err ? " [TCP_UDP_CHKSUM_ERR]" : "", rx_ev_eth_crc_err ? " [ETH_CRC_ERR]" : "", rx_ev_frm_trunc ? " [FRM_TRUNC]" : "", rx_ev_drib_nib ? " [DRIB_NIB]" : "", rx_ev_tobe_disc ? " [TOBE_DISC]" : "", rx_ev_pause_frm ? " [PAUSE]" : "", snap ? " [SNAP/LLC]" : ""); } #endif if (unlikely(rx_ev_eth_crc_err && EFX_WORKAROUND_10750(efx) && efx->phy_type == PHY_TYPE_10XPRESS)) tenxpress_crc_err(efx); } /* Handle receive events that are not in-order. */ static void falcon_handle_rx_bad_index(struct efx_rx_queue *rx_queue, unsigned index) { struct efx_nic *efx = rx_queue->efx; unsigned expected, dropped; expected = rx_queue->removed_count & FALCON_RXD_RING_MASK; dropped = ((index + FALCON_RXD_RING_SIZE - expected) & FALCON_RXD_RING_MASK); EFX_INFO(efx, "dropped %d events (index=%d expected=%d)\n", dropped, index, expected); efx_schedule_reset(efx, EFX_WORKAROUND_5676(efx) ? RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE); } /* Handle a packet received event * * Falcon silicon gives a "discard" flag if it's a unicast packet with the * wrong destination address * Also "is multicast" and "matches multicast filter" flags can be used to * discard non-matching multicast packets. */ static inline int falcon_handle_rx_event(struct efx_channel *channel, const efx_qword_t *event) { unsigned int rx_ev_q_label, rx_ev_desc_ptr, rx_ev_byte_cnt; unsigned int rx_ev_pkt_ok, rx_ev_hdr_type, rx_ev_mcast_pkt; unsigned expected_ptr; int discard = 0, checksummed; struct efx_rx_queue *rx_queue; struct efx_nic *efx = channel->efx; /* Basic packet information */ rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, RX_EV_BYTE_CNT); rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, RX_EV_PKT_OK); rx_ev_hdr_type = EFX_QWORD_FIELD(*event, RX_EV_HDR_TYPE); WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_JUMBO_CONT)); WARN_ON(EFX_QWORD_FIELD(*event, RX_EV_SOP) != 1); rx_ev_q_label = EFX_QWORD_FIELD(*event, RX_EV_Q_LABEL); rx_queue = &efx->rx_queue[rx_ev_q_label]; rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, RX_EV_DESC_PTR); expected_ptr = rx_queue->removed_count & FALCON_RXD_RING_MASK; if (unlikely(rx_ev_desc_ptr != expected_ptr)) { falcon_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr); return rx_ev_q_label; } if (likely(rx_ev_pkt_ok)) { /* If packet is marked as OK and packet type is TCP/IPv4 or * UDP/IPv4, then we can rely on the hardware checksum. */ checksummed = RX_EV_HDR_TYPE_HAS_CHECKSUMS(rx_ev_hdr_type); } else { falcon_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok, &discard, rx_ev_byte_cnt); checksummed = 0; } /* Detect multicast packets that didn't match the filter */ rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, RX_EV_MCAST_PKT); if (rx_ev_mcast_pkt) { unsigned int rx_ev_mcast_hash_match = EFX_QWORD_FIELD(*event, RX_EV_MCAST_HASH_MATCH); if (unlikely(!rx_ev_mcast_hash_match)) discard = 1; } /* Handle received packet */ efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt, checksummed, discard); return rx_ev_q_label; } /* Global events are basically PHY events */ static void falcon_handle_global_event(struct efx_channel *channel, efx_qword_t *event) { struct efx_nic *efx = channel->efx; int is_phy_event = 0, handled = 0; /* Check for interrupt on either port. Some boards have a * single PHY wired to the interrupt line for port 1. */ if (EFX_QWORD_FIELD(*event, G_PHY0_INTR) || EFX_QWORD_FIELD(*event, G_PHY1_INTR) || EFX_QWORD_FIELD(*event, XG_PHY_INTR)) is_phy_event = 1; if ((FALCON_REV(efx) >= FALCON_REV_B0) && EFX_OWORD_FIELD(*event, XG_MNT_INTR_B0)) is_phy_event = 1; if (is_phy_event) { efx->phy_op->clear_interrupt(efx); queue_work(efx->workqueue, &efx->reconfigure_work); handled = 1; } if (EFX_QWORD_FIELD_VER(efx, *event, RX_RECOVERY)) { EFX_ERR(efx, "channel %d seen global RX_RESET " "event. Resetting.\n", channel->channel); atomic_inc(&efx->rx_reset); efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ? RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE); handled = 1; } if (!handled) EFX_ERR(efx, "channel %d unknown global event " EFX_QWORD_FMT "\n", channel->channel, EFX_QWORD_VAL(*event)); } static void falcon_handle_driver_event(struct efx_channel *channel, efx_qword_t *event) { struct efx_nic *efx = channel->efx; unsigned int ev_sub_code; unsigned int ev_sub_data; ev_sub_code = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_CODE); ev_sub_data = EFX_QWORD_FIELD(*event, DRIVER_EV_SUB_DATA); switch (ev_sub_code) { case TX_DESCQ_FLS_DONE_EV_DECODE: EFX_TRACE(efx, "channel %d TXQ %d flushed\n", channel->channel, ev_sub_data); break; case RX_DESCQ_FLS_DONE_EV_DECODE: EFX_TRACE(efx, "channel %d RXQ %d flushed\n", channel->channel, ev_sub_data); break; case EVQ_INIT_DONE_EV_DECODE: EFX_LOG(efx, "channel %d EVQ %d initialised\n", channel->channel, ev_sub_data); break; case SRM_UPD_DONE_EV_DECODE: EFX_TRACE(efx, "channel %d SRAM update done\n", channel->channel); break; case WAKE_UP_EV_DECODE: EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n", channel->channel, ev_sub_data); break; case TIMER_EV_DECODE: EFX_TRACE(efx, "channel %d RX queue %d timer expired\n", channel->channel, ev_sub_data); break; case RX_RECOVERY_EV_DECODE: EFX_ERR(efx, "channel %d seen DRIVER RX_RESET event. " "Resetting.\n", channel->channel); atomic_inc(&efx->rx_reset); efx_schedule_reset(efx, EFX_WORKAROUND_6555(efx) ? RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE); break; case RX_DSC_ERROR_EV_DECODE: EFX_ERR(efx, "RX DMA Q %d reports descriptor fetch error." " RX Q %d is disabled.\n", ev_sub_data, ev_sub_data); efx_schedule_reset(efx, RESET_TYPE_RX_DESC_FETCH); break; case TX_DSC_ERROR_EV_DECODE: EFX_ERR(efx, "TX DMA Q %d reports descriptor fetch error." " TX Q %d is disabled.\n", ev_sub_data, ev_sub_data); efx_schedule_reset(efx, RESET_TYPE_TX_DESC_FETCH); break; default: EFX_TRACE(efx, "channel %d unknown driver event code %d " "data %04x\n", channel->channel, ev_sub_code, ev_sub_data); break; } } int falcon_process_eventq(struct efx_channel *channel, int *rx_quota) { unsigned int read_ptr; efx_qword_t event, *p_event; int ev_code; int rxq; int rxdmaqs = 0; read_ptr = channel->eventq_read_ptr; do { p_event = falcon_event(channel, read_ptr); event = *p_event; if (!falcon_event_present(&event)) /* End of events */ break; EFX_TRACE(channel->efx, "channel %d event is "EFX_QWORD_FMT"\n", channel->channel, EFX_QWORD_VAL(event)); /* Clear this event by marking it all ones */ EFX_SET_QWORD(*p_event); ev_code = EFX_QWORD_FIELD(event, EV_CODE); switch (ev_code) { case RX_IP_EV_DECODE: rxq = falcon_handle_rx_event(channel, &event); rxdmaqs |= (1 << rxq); (*rx_quota)--; break; case TX_IP_EV_DECODE: falcon_handle_tx_event(channel, &event); break; case DRV_GEN_EV_DECODE: channel->eventq_magic = EFX_QWORD_FIELD(event, EVQ_MAGIC); EFX_LOG(channel->efx, "channel %d received generated " "event "EFX_QWORD_FMT"\n", channel->channel, EFX_QWORD_VAL(event)); break; case GLOBAL_EV_DECODE: falcon_handle_global_event(channel, &event); break; case DRIVER_EV_DECODE: falcon_handle_driver_event(channel, &event); break; default: EFX_ERR(channel->efx, "channel %d unknown event type %d" " (data " EFX_QWORD_FMT ")\n", channel->channel, ev_code, EFX_QWORD_VAL(event)); } /* Increment read pointer */ read_ptr = (read_ptr + 1) & FALCON_EVQ_MASK; } while (*rx_quota); channel->eventq_read_ptr = read_ptr; return rxdmaqs; } void falcon_set_int_moderation(struct efx_channel *channel) { efx_dword_t timer_cmd; struct efx_nic *efx = channel->efx; /* Set timer register */ if (channel->irq_moderation) { /* Round to resolution supported by hardware. The value we * program is based at 0. So actual interrupt moderation * achieved is ((x + 1) * res). */ unsigned int res = 5; channel->irq_moderation -= (channel->irq_moderation % res); if (channel->irq_moderation < res) channel->irq_moderation = res; EFX_POPULATE_DWORD_2(timer_cmd, TIMER_MODE, TIMER_MODE_INT_HLDOFF, TIMER_VAL, (channel->irq_moderation / res) - 1); } else { EFX_POPULATE_DWORD_2(timer_cmd, TIMER_MODE, TIMER_MODE_DIS, TIMER_VAL, 0); } falcon_writel_page_locked(efx, &timer_cmd, TIMER_CMD_REG_KER, channel->evqnum); } /* Allocate buffer table entries for event queue */ int falcon_probe_eventq(struct efx_channel *channel) { struct efx_nic *efx = channel->efx; unsigned int evq_size; evq_size = FALCON_EVQ_SIZE * sizeof(efx_qword_t); return falcon_alloc_special_buffer(efx, &channel->eventq, evq_size); } int falcon_init_eventq(struct efx_channel *channel) { efx_oword_t evq_ptr; struct efx_nic *efx = channel->efx; int rc; EFX_LOG(efx, "channel %d event queue in special buffers %d-%d\n", channel->channel, channel->eventq.index, channel->eventq.index + channel->eventq.entries - 1); /* Pin event queue buffer */ rc = falcon_init_special_buffer(efx, &channel->eventq); if (rc) return rc; /* Fill event queue with all ones (i.e. empty events) */ memset(channel->eventq.addr, 0xff, channel->eventq.len); /* Push event queue to card */ EFX_POPULATE_OWORD_3(evq_ptr, EVQ_EN, 1, EVQ_SIZE, FALCON_EVQ_ORDER, EVQ_BUF_BASE_ID, channel->eventq.index); falcon_write_table(efx, &evq_ptr, efx->type->evq_ptr_tbl_base, channel->evqnum); falcon_set_int_moderation(channel); return 0; } void falcon_fini_eventq(struct efx_channel *channel) { efx_oword_t eventq_ptr; struct efx_nic *efx = channel->efx; /* Remove event queue from card */ EFX_ZERO_OWORD(eventq_ptr); falcon_write_table(efx, &eventq_ptr, efx->type->evq_ptr_tbl_base, channel->evqnum); /* Unpin event queue */ falcon_fini_special_buffer(efx, &channel->eventq); } /* Free buffers backing event queue */ void falcon_remove_eventq(struct efx_channel *channel) { falcon_free_special_buffer(channel->efx, &channel->eventq); } /* Generates a test event on the event queue. A subsequent call to * process_eventq() should pick up the event and place the value of * "magic" into channel->eventq_magic; */ void falcon_generate_test_event(struct efx_channel *channel, unsigned int magic) { efx_qword_t test_event; EFX_POPULATE_QWORD_2(test_event, EV_CODE, DRV_GEN_EV_DECODE, EVQ_MAGIC, magic); falcon_generate_event(channel, &test_event); } /************************************************************************** * * Falcon hardware interrupts * The hardware interrupt handler does very little work; all the event * queue processing is carried out by per-channel tasklets. * **************************************************************************/ /* Enable/disable/generate Falcon interrupts */ static inline void falcon_interrupts(struct efx_nic *efx, int enabled, int force) { efx_oword_t int_en_reg_ker; EFX_POPULATE_OWORD_2(int_en_reg_ker, KER_INT_KER, force, DRV_INT_EN_KER, enabled); falcon_write(efx, &int_en_reg_ker, INT_EN_REG_KER); } void falcon_enable_interrupts(struct efx_nic *efx) { efx_oword_t int_adr_reg_ker; struct efx_channel *channel; EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr)); wmb(); /* Ensure interrupt vector is clear before interrupts enabled */ /* Program address */ EFX_POPULATE_OWORD_2(int_adr_reg_ker, NORM_INT_VEC_DIS_KER, EFX_INT_MODE_USE_MSI(efx), INT_ADR_KER, efx->irq_status.dma_addr); falcon_write(efx, &int_adr_reg_ker, INT_ADR_REG_KER); /* Enable interrupts */ falcon_interrupts(efx, 1, 0); /* Force processing of all the channels to get the EVQ RPTRs up to date */ efx_for_each_channel_with_interrupt(channel, efx) efx_schedule_channel(channel); } void falcon_disable_interrupts(struct efx_nic *efx) { /* Disable interrupts */ falcon_interrupts(efx, 0, 0); } /* Generate a Falcon test interrupt * Interrupt must already have been enabled, otherwise nasty things * may happen. */ void falcon_generate_interrupt(struct efx_nic *efx) { falcon_interrupts(efx, 1, 1); } /* Acknowledge a legacy interrupt from Falcon * * This acknowledges a legacy (not MSI) interrupt via INT_ACK_KER_REG. * * Due to SFC bug 3706 (silicon revision <=A1) reads can be duplicated in the * BIU. Interrupt acknowledge is read sensitive so must write instead * (then read to ensure the BIU collector is flushed) * * NB most hardware supports MSI interrupts */ static inline void falcon_irq_ack_a1(struct efx_nic *efx) { efx_dword_t reg; EFX_POPULATE_DWORD_1(reg, INT_ACK_DUMMY_DATA, 0xb7eb7e); falcon_writel(efx, ®, INT_ACK_REG_KER_A1); falcon_readl(efx, ®, WORK_AROUND_BROKEN_PCI_READS_REG_KER_A1); } /* Process a fatal interrupt * Disable bus mastering ASAP and schedule a reset */ static irqreturn_t falcon_fatal_interrupt(struct efx_nic *efx) { struct falcon_nic_data *nic_data = efx->nic_data; efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr; efx_oword_t fatal_intr; int error, mem_perr; static int n_int_errors; falcon_read(efx, &fatal_intr, FATAL_INTR_REG_KER); error = EFX_OWORD_FIELD(fatal_intr, INT_KER_ERROR); EFX_ERR(efx, "SYSTEM ERROR " EFX_OWORD_FMT " status " EFX_OWORD_FMT ": %s\n", EFX_OWORD_VAL(*int_ker), EFX_OWORD_VAL(fatal_intr), error ? "disabling bus mastering" : "no recognised error"); if (error == 0) goto out; /* If this is a memory parity error dump which blocks are offending */ mem_perr = EFX_OWORD_FIELD(fatal_intr, MEM_PERR_INT_KER); if (mem_perr) { efx_oword_t reg; falcon_read(efx, ®, MEM_STAT_REG_KER); EFX_ERR(efx, "SYSTEM ERROR: memory parity error " EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg)); } /* Disable DMA bus mastering on both devices */ pci_disable_device(efx->pci_dev); if (FALCON_IS_DUAL_FUNC(efx)) pci_disable_device(nic_data->pci_dev2); if (++n_int_errors < FALCON_MAX_INT_ERRORS) { EFX_ERR(efx, "SYSTEM ERROR - reset scheduled\n"); efx_schedule_reset(efx, RESET_TYPE_INT_ERROR); } else { EFX_ERR(efx, "SYSTEM ERROR - max number of errors seen." "NIC will be disabled\n"); efx_schedule_reset(efx, RESET_TYPE_DISABLE); } out: return IRQ_HANDLED; } /* Handle a legacy interrupt from Falcon * Acknowledges the interrupt and schedule event queue processing. */ static irqreturn_t falcon_legacy_interrupt_b0(int irq, void *dev_id) { struct efx_nic *efx = (struct efx_nic *)dev_id; efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr; struct efx_channel *channel; efx_dword_t reg; u32 queues; int syserr; /* Read the ISR which also ACKs the interrupts */ falcon_readl(efx, ®, INT_ISR0_B0); queues = EFX_EXTRACT_DWORD(reg, 0, 31); /* Check to see if we have a serious error condition */ syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT); if (unlikely(syserr)) return falcon_fatal_interrupt(efx); if (queues == 0) return IRQ_NONE; efx->last_irq_cpu = raw_smp_processor_id(); EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n", irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg)); /* Schedule processing of any interrupting queues */ channel = &efx->channel[0]; while (queues) { if (queues & 0x01) efx_schedule_channel(channel); channel++; queues >>= 1; } return IRQ_HANDLED; } static irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id) { struct efx_nic *efx = (struct efx_nic *)dev_id; efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr; struct efx_channel *channel; int syserr; int queues; /* Check to see if this is our interrupt. If it isn't, we * exit without having touched the hardware. */ if (unlikely(EFX_OWORD_IS_ZERO(*int_ker))) { EFX_TRACE(efx, "IRQ %d on CPU %d not for me\n", irq, raw_smp_processor_id()); return IRQ_NONE; } efx->last_irq_cpu = raw_smp_processor_id(); EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n", irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker)); /* Check to see if we have a serious error condition */ syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT); if (unlikely(syserr)) return falcon_fatal_interrupt(efx); /* Determine interrupting queues, clear interrupt status * register and acknowledge the device interrupt. */ BUILD_BUG_ON(INT_EVQS_WIDTH > EFX_MAX_CHANNELS); queues = EFX_OWORD_FIELD(*int_ker, INT_EVQS); EFX_ZERO_OWORD(*int_ker); wmb(); /* Ensure the vector is cleared before interrupt ack */ falcon_irq_ack_a1(efx); /* Schedule processing of any interrupting queues */ channel = &efx->channel[0]; while (queues) { if (queues & 0x01) efx_schedule_channel(channel); channel++; queues >>= 1; } return IRQ_HANDLED; } /* Handle an MSI interrupt from Falcon * * Handle an MSI hardware interrupt. This routine schedules event * queue processing. No interrupt acknowledgement cycle is necessary. * Also, we never need to check that the interrupt is for us, since * MSI interrupts cannot be shared. */ static irqreturn_t falcon_msi_interrupt(int irq, void *dev_id) { struct efx_channel *channel = (struct efx_channel *)dev_id; struct efx_nic *efx = channel->efx; efx_oword_t *int_ker = (efx_oword_t *) efx->irq_status.addr; int syserr; efx->last_irq_cpu = raw_smp_processor_id(); EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n", irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker)); /* Check to see if we have a serious error condition */ syserr = EFX_OWORD_FIELD(*int_ker, FATAL_INT); if (unlikely(syserr)) return falcon_fatal_interrupt(efx); /* Schedule processing of the channel */ efx_schedule_channel(channel); return IRQ_HANDLED; } /* Setup RSS indirection table. * This maps from the hash value of the packet to RXQ */ static void falcon_setup_rss_indir_table(struct efx_nic *efx) { int i = 0; unsigned long offset; efx_dword_t dword; if (FALCON_REV(efx) < FALCON_REV_B0) return; for (offset = RX_RSS_INDIR_TBL_B0; offset < RX_RSS_INDIR_TBL_B0 + 0x800; offset += 0x10) { EFX_POPULATE_DWORD_1(dword, RX_RSS_INDIR_ENT_B0, i % efx->rss_queues); falcon_writel(efx, &dword, offset); i++; } } /* Hook interrupt handler(s) * Try MSI and then legacy interrupts. */ int falcon_init_interrupt(struct efx_nic *efx) { struct efx_channel *channel; int rc; if (!EFX_INT_MODE_USE_MSI(efx)) { irq_handler_t handler; if (FALCON_REV(efx) >= FALCON_REV_B0) handler = falcon_legacy_interrupt_b0; else handler = falcon_legacy_interrupt_a1; rc = request_irq(efx->legacy_irq, handler, IRQF_SHARED, efx->name, efx); if (rc) { EFX_ERR(efx, "failed to hook legacy IRQ %d\n", efx->pci_dev->irq); goto fail1; } return 0; } /* Hook MSI or MSI-X interrupt */ efx_for_each_channel_with_interrupt(channel, efx) { rc = request_irq(channel->irq, falcon_msi_interrupt, IRQF_PROBE_SHARED, /* Not shared */ efx->name, channel); if (rc) { EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq); goto fail2; } } return 0; fail2: efx_for_each_channel_with_interrupt(channel, efx) free_irq(channel->irq, channel); fail1: return rc; } void falcon_fini_interrupt(struct efx_nic *efx) { struct efx_channel *channel; efx_oword_t reg; /* Disable MSI/MSI-X interrupts */ efx_for_each_channel_with_interrupt(channel, efx) if (channel->irq) free_irq(channel->irq, channel); /* ACK legacy interrupt */ if (FALCON_REV(efx) >= FALCON_REV_B0) falcon_read(efx, ®, INT_ISR0_B0); else falcon_irq_ack_a1(efx); /* Disable legacy interrupt */ if (efx->legacy_irq) free_irq(efx->legacy_irq, efx); } /************************************************************************** * * EEPROM/flash * ************************************************************************** */ #define FALCON_SPI_MAX_LEN sizeof(efx_oword_t) /* Wait for SPI command completion */ static int falcon_spi_wait(struct efx_nic *efx) { efx_oword_t reg; int cmd_en, timer_active; int count; count = 0; do { falcon_read(efx, ®, EE_SPI_HCMD_REG_KER); cmd_en = EFX_OWORD_FIELD(reg, EE_SPI_HCMD_CMD_EN); timer_active = EFX_OWORD_FIELD(reg, EE_WR_TIMER_ACTIVE); if (!cmd_en && !timer_active) return 0; udelay(10); } while (++count < 10000); /* wait upto 100msec */ EFX_ERR(efx, "timed out waiting for SPI\n"); return -ETIMEDOUT; } static int falcon_spi_read(struct efx_nic *efx, int device_id, unsigned int command, unsigned int address, unsigned int addr_len, void *data, unsigned int len) { efx_oword_t reg; int rc; BUG_ON(len > FALCON_SPI_MAX_LEN); /* Check SPI not currently being accessed */ rc = falcon_spi_wait(efx); if (rc) return rc; /* Program address register */ EFX_POPULATE_OWORD_1(reg, EE_SPI_HADR_ADR, address); falcon_write(efx, ®, EE_SPI_HADR_REG_KER); /* Issue read command */ EFX_POPULATE_OWORD_7(reg, EE_SPI_HCMD_CMD_EN, 1, EE_SPI_HCMD_SF_SEL, device_id, EE_SPI_HCMD_DABCNT, len, EE_SPI_HCMD_READ, EE_SPI_READ, EE_SPI_HCMD_DUBCNT, 0, EE_SPI_HCMD_ADBCNT, addr_len, EE_SPI_HCMD_ENC, command); falcon_write(efx, ®, EE_SPI_HCMD_REG_KER); /* Wait for read to complete */ rc = falcon_spi_wait(efx); if (rc) return rc; /* Read data */ falcon_read(efx, ®, EE_SPI_HDATA_REG_KER); memcpy(data, ®, len); return 0; } /************************************************************************** * * MAC wrapper * ************************************************************************** */ void falcon_drain_tx_fifo(struct efx_nic *efx) { efx_oword_t temp; int count; if ((FALCON_REV(efx) < FALCON_REV_B0) || (efx->loopback_mode != LOOPBACK_NONE)) return; falcon_read(efx, &temp, MAC0_CTRL_REG_KER); /* There is no point in draining more than once */ if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0)) return; /* MAC stats will fail whilst the TX fifo is draining. Serialise * the drain sequence with the statistics fetch */ spin_lock(&efx->stats_lock); EFX_SET_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0, 1); falcon_write(efx, &temp, MAC0_CTRL_REG_KER); /* Reset the MAC and EM block. */ falcon_read(efx, &temp, GLB_CTL_REG_KER); EFX_SET_OWORD_FIELD(temp, RST_XGTX, 1); EFX_SET_OWORD_FIELD(temp, RST_XGRX, 1); EFX_SET_OWORD_FIELD(temp, RST_EM, 1); falcon_write(efx, &temp, GLB_CTL_REG_KER); count = 0; while (1) { falcon_read(efx, &temp, GLB_CTL_REG_KER); if (!EFX_OWORD_FIELD(temp, RST_XGTX) && !EFX_OWORD_FIELD(temp, RST_XGRX) && !EFX_OWORD_FIELD(temp, RST_EM)) { EFX_LOG(efx, "Completed MAC reset after %d loops\n", count); break; } if (count > 20) { EFX_ERR(efx, "MAC reset failed\n"); break; } count++; udelay(10); } spin_unlock(&efx->stats_lock); /* If we've reset the EM block and the link is up, then * we'll have to kick the XAUI link so the PHY can recover */ if (efx->link_up && EFX_WORKAROUND_5147(efx)) falcon_reset_xaui(efx); } void falcon_deconfigure_mac_wrapper(struct efx_nic *efx) { efx_oword_t temp; if (FALCON_REV(efx) < FALCON_REV_B0) return; /* Isolate the MAC -> RX */ falcon_read(efx, &temp, RX_CFG_REG_KER); EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 0); falcon_write(efx, &temp, RX_CFG_REG_KER); if (!efx->link_up) falcon_drain_tx_fifo(efx); } void falcon_reconfigure_mac_wrapper(struct efx_nic *efx) { efx_oword_t reg; int link_speed; unsigned int tx_fc; if (efx->link_options & GM_LPA_10000) link_speed = 0x3; else if (efx->link_options & GM_LPA_1000) link_speed = 0x2; else if (efx->link_options & GM_LPA_100) link_speed = 0x1; else link_speed = 0x0; /* MAC_LINK_STATUS controls MAC backpressure but doesn't work * as advertised. Disable to ensure packets are not * indefinitely held and TX queue can be flushed at any point * while the link is down. */ EFX_POPULATE_OWORD_5(reg, MAC_XOFF_VAL, 0xffff /* max pause time */, MAC_BCAD_ACPT, 1, MAC_UC_PROM, efx->promiscuous, MAC_LINK_STATUS, 1, /* always set */ MAC_SPEED, link_speed); /* On B0, MAC backpressure can be disabled and packets get * discarded. */ if (FALCON_REV(efx) >= FALCON_REV_B0) { EFX_SET_OWORD_FIELD(reg, TXFIFO_DRAIN_EN_B0, !efx->link_up); } falcon_write(efx, ®, MAC0_CTRL_REG_KER); /* Restore the multicast hash registers. */ falcon_set_multicast_hash(efx); /* Transmission of pause frames when RX crosses the threshold is * covered by RX_XOFF_MAC_EN and XM_TX_CFG_REG:XM_FCNTL. * Action on receipt of pause frames is controller by XM_DIS_FCNTL */ tx_fc = (efx->flow_control & EFX_FC_TX) ? 1 : 0; falcon_read(efx, ®, RX_CFG_REG_KER); EFX_SET_OWORD_FIELD_VER(efx, reg, RX_XOFF_MAC_EN, tx_fc); /* Unisolate the MAC -> RX */ if (FALCON_REV(efx) >= FALCON_REV_B0) EFX_SET_OWORD_FIELD(reg, RX_INGR_EN_B0, 1); falcon_write(efx, ®, RX_CFG_REG_KER); } int falcon_dma_stats(struct efx_nic *efx, unsigned int done_offset) { efx_oword_t reg; u32 *dma_done; int i; if (disable_dma_stats) return 0; /* Statistics fetch will fail if the MAC is in TX drain */ if (FALCON_REV(efx) >= FALCON_REV_B0) { efx_oword_t temp; falcon_read(efx, &temp, MAC0_CTRL_REG_KER); if (EFX_OWORD_FIELD(temp, TXFIFO_DRAIN_EN_B0)) return 0; } dma_done = (efx->stats_buffer.addr + done_offset); *dma_done = FALCON_STATS_NOT_DONE; wmb(); /* ensure done flag is clear */ /* Initiate DMA transfer of stats */ EFX_POPULATE_OWORD_2(reg, MAC_STAT_DMA_CMD, 1, MAC_STAT_DMA_ADR, efx->stats_buffer.dma_addr); falcon_write(efx, ®, MAC0_STAT_DMA_REG_KER); /* Wait for transfer to complete */ for (i = 0; i < 400; i++) { if (*(volatile u32 *)dma_done == FALCON_STATS_DONE) return 0; udelay(10); } EFX_ERR(efx, "timed out waiting for statistics\n"); return -ETIMEDOUT; } /************************************************************************** * * PHY access via GMII * ************************************************************************** */ /* Use the top bit of the MII PHY id to indicate the PHY type * (1G/10G), with the remaining bits as the actual PHY id. * * This allows us to avoid leaking information from the mii_if_info * structure into other data structures. */ #define FALCON_PHY_ID_ID_WIDTH EFX_WIDTH(MD_PRT_DEV_ADR) #define FALCON_PHY_ID_ID_MASK ((1 << FALCON_PHY_ID_ID_WIDTH) - 1) #define FALCON_PHY_ID_WIDTH (FALCON_PHY_ID_ID_WIDTH + 1) #define FALCON_PHY_ID_MASK ((1 << FALCON_PHY_ID_WIDTH) - 1) #define FALCON_PHY_ID_10G (1 << (FALCON_PHY_ID_WIDTH - 1)) /* Packing the clause 45 port and device fields into a single value */ #define MD_PRT_ADR_COMP_LBN (MD_PRT_ADR_LBN - MD_DEV_ADR_LBN) #define MD_PRT_ADR_COMP_WIDTH MD_PRT_ADR_WIDTH #define MD_DEV_ADR_COMP_LBN 0 #define MD_DEV_ADR_COMP_WIDTH MD_DEV_ADR_WIDTH /* Wait for GMII access to complete */ static int falcon_gmii_wait(struct efx_nic *efx) { efx_dword_t md_stat; int count; for (count = 0; count < 1000; count++) { /* wait upto 10ms */ falcon_readl(efx, &md_stat, MD_STAT_REG_KER); if (EFX_DWORD_FIELD(md_stat, MD_BSY) == 0) { if (EFX_DWORD_FIELD(md_stat, MD_LNFL) != 0 || EFX_DWORD_FIELD(md_stat, MD_BSERR) != 0) { EFX_ERR(efx, "error from GMII access " EFX_DWORD_FMT"\n", EFX_DWORD_VAL(md_stat)); return -EIO; } return 0; } udelay(10); } EFX_ERR(efx, "timed out waiting for GMII\n"); return -ETIMEDOUT; } /* Writes a GMII register of a PHY connected to Falcon using MDIO. */ static void falcon_mdio_write(struct net_device *net_dev, int phy_id, int addr, int value) { struct efx_nic *efx = (struct efx_nic *)net_dev->priv; unsigned int phy_id2 = phy_id & FALCON_PHY_ID_ID_MASK; efx_oword_t reg; /* The 'generic' prt/dev packing in mdio_10g.h is conveniently * chosen so that the only current user, Falcon, can take the * packed value and use them directly. * Fail to build if this assumption is broken. */ BUILD_BUG_ON(FALCON_PHY_ID_10G != MDIO45_XPRT_ID_IS10G); BUILD_BUG_ON(FALCON_PHY_ID_ID_WIDTH != MDIO45_PRT_DEV_WIDTH); BUILD_BUG_ON(MD_PRT_ADR_COMP_LBN != MDIO45_PRT_ID_COMP_LBN); BUILD_BUG_ON(MD_DEV_ADR_COMP_LBN != MDIO45_DEV_ID_COMP_LBN); if (phy_id2 == PHY_ADDR_INVALID) return; /* See falcon_mdio_read for an explanation. */ if (!(phy_id & FALCON_PHY_ID_10G)) { int mmd = ffs(efx->phy_op->mmds) - 1; EFX_TRACE(efx, "Fixing erroneous clause22 write\n"); phy_id2 = mdio_clause45_pack(phy_id2, mmd) & FALCON_PHY_ID_ID_MASK; } EFX_REGDUMP(efx, "writing GMII %d register %02x with %04x\n", phy_id, addr, value); spin_lock_bh(&efx->phy_lock); /* Check MII not currently being accessed */ if (falcon_gmii_wait(efx) != 0) goto out; /* Write the address/ID register */ EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr); falcon_write(efx, ®, MD_PHY_ADR_REG_KER); EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_id2); falcon_write(efx, ®, MD_ID_REG_KER); /* Write data */ EFX_POPULATE_OWORD_1(reg, MD_TXD, value); falcon_write(efx, ®, MD_TXD_REG_KER); EFX_POPULATE_OWORD_2(reg, MD_WRC, 1, MD_GC, 0); falcon_write(efx, ®, MD_CS_REG_KER); /* Wait for data to be written */ if (falcon_gmii_wait(efx) != 0) { /* Abort the write operation */ EFX_POPULATE_OWORD_2(reg, MD_WRC, 0, MD_GC, 1); falcon_write(efx, ®, MD_CS_REG_KER); udelay(10); } out: spin_unlock_bh(&efx->phy_lock); } /* Reads a GMII register from a PHY connected to Falcon. If no value * could be read, -1 will be returned. */ static int falcon_mdio_read(struct net_device *net_dev, int phy_id, int addr) { struct efx_nic *efx = (struct efx_nic *)net_dev->priv; unsigned int phy_addr = phy_id & FALCON_PHY_ID_ID_MASK; efx_oword_t reg; int value = -1; if (phy_addr == PHY_ADDR_INVALID) return -1; /* Our PHY code knows whether it needs to talk clause 22(1G) or 45(10G) * but the generic Linux code does not make any distinction or have * any state for this. * We spot the case where someone tried to talk 22 to a 45 PHY and * redirect the request to the lowest numbered MMD as a clause45 * request. This is enough to allow simple queries like id and link * state to succeed. TODO: We may need to do more in future. */ if (!(phy_id & FALCON_PHY_ID_10G)) { int mmd = ffs(efx->phy_op->mmds) - 1; EFX_TRACE(efx, "Fixing erroneous clause22 read\n"); phy_addr = mdio_clause45_pack(phy_addr, mmd) & FALCON_PHY_ID_ID_MASK; } spin_lock_bh(&efx->phy_lock); /* Check MII not currently being accessed */ if (falcon_gmii_wait(efx) != 0) goto out; EFX_POPULATE_OWORD_1(reg, MD_PHY_ADR, addr); falcon_write(efx, ®, MD_PHY_ADR_REG_KER); EFX_POPULATE_OWORD_1(reg, MD_PRT_DEV_ADR, phy_addr); falcon_write(efx, ®, MD_ID_REG_KER); /* Request data to be read */ EFX_POPULATE_OWORD_2(reg, MD_RDC, 1, MD_GC, 0); falcon_write(efx, ®, MD_CS_REG_KER); /* Wait for data to become available */ value = falcon_gmii_wait(efx); if (value == 0) { falcon_read(efx, ®, MD_RXD_REG_KER); value = EFX_OWORD_FIELD(reg, MD_RXD); EFX_REGDUMP(efx, "read from GMII %d register %02x, got %04x\n", phy_id, addr, value); } else { /* Abort the read operation */ EFX_POPULATE_OWORD_2(reg, MD_RIC, 0, MD_GC, 1); falcon_write(efx, ®, MD_CS_REG_KER); EFX_LOG(efx, "read from GMII 0x%x register %02x, got " "error %d\n", phy_id, addr, value); } out: spin_unlock_bh(&efx->phy_lock); return value; } static void falcon_init_mdio(struct mii_if_info *gmii) { gmii->mdio_read = falcon_mdio_read; gmii->mdio_write = falcon_mdio_write; gmii->phy_id_mask = FALCON_PHY_ID_MASK; gmii->reg_num_mask = ((1 << EFX_WIDTH(MD_PHY_ADR)) - 1); } static int falcon_probe_phy(struct efx_nic *efx) { switch (efx->phy_type) { case PHY_TYPE_10XPRESS: efx->phy_op = &falcon_tenxpress_phy_ops; break; case PHY_TYPE_XFP: efx->phy_op = &falcon_xfp_phy_ops; break; default: EFX_ERR(efx, "Unknown PHY type %d\n", efx->phy_type); return -1; } efx->loopback_modes = LOOPBACKS_10G_INTERNAL | efx->phy_op->loopbacks; return 0; } /* This call is responsible for hooking in the MAC and PHY operations */ int falcon_probe_port(struct efx_nic *efx) { int rc; /* Hook in PHY operations table */ rc = falcon_probe_phy(efx); if (rc) return rc; /* Set up GMII structure for PHY */ efx->mii.supports_gmii = 1; falcon_init_mdio(&efx->mii); /* Hardware flow ctrl. FalconA RX FIFO too small for pause generation */ if (FALCON_REV(efx) >= FALCON_REV_B0) efx->flow_control = EFX_FC_RX | EFX_FC_TX; else efx->flow_control = EFX_FC_RX; /* Allocate buffer for stats */ rc = falcon_alloc_buffer(efx, &efx->stats_buffer, FALCON_MAC_STATS_SIZE); if (rc) return rc; EFX_LOG(efx, "stats buffer at %llx (virt %p phys %lx)\n", (unsigned long long)efx->stats_buffer.dma_addr, efx->stats_buffer.addr, virt_to_phys(efx->stats_buffer.addr)); return 0; } void falcon_remove_port(struct efx_nic *efx) { falcon_free_buffer(efx, &efx->stats_buffer); } /************************************************************************** * * Multicast filtering * ************************************************************************** */ void falcon_set_multicast_hash(struct efx_nic *efx) { union efx_multicast_hash *mc_hash = &efx->multicast_hash; /* Broadcast packets go through the multicast hash filter. * ether_crc_le() of the broadcast address is 0xbe2612ff * so we always add bit 0xff to the mask. */ set_bit_le(0xff, mc_hash->byte); falcon_write(efx, &mc_hash->oword[0], MAC_MCAST_HASH_REG0_KER); falcon_write(efx, &mc_hash->oword[1], MAC_MCAST_HASH_REG1_KER); } /************************************************************************** * * Device reset * ************************************************************************** */ /* Resets NIC to known state. This routine must be called in process * context and is allowed to sleep. */ int falcon_reset_hw(struct efx_nic *efx, enum reset_type method) { struct falcon_nic_data *nic_data = efx->nic_data; efx_oword_t glb_ctl_reg_ker; int rc; EFX_LOG(efx, "performing hardware reset (%d)\n", method); /* Initiate device reset */ if (method == RESET_TYPE_WORLD) { rc = pci_save_state(efx->pci_dev); if (rc) { EFX_ERR(efx, "failed to backup PCI state of primary " "function prior to hardware reset\n"); goto fail1; } if (FALCON_IS_DUAL_FUNC(efx)) { rc = pci_save_state(nic_data->pci_dev2); if (rc) { EFX_ERR(efx, "failed to backup PCI state of " "secondary function prior to " "hardware reset\n"); goto fail2; } } EFX_POPULATE_OWORD_2(glb_ctl_reg_ker, EXT_PHY_RST_DUR, 0x7, SWRST, 1); } else { int reset_phy = (method == RESET_TYPE_INVISIBLE ? EXCLUDE_FROM_RESET : 0); EFX_POPULATE_OWORD_7(glb_ctl_reg_ker, EXT_PHY_RST_CTL, reset_phy, PCIE_CORE_RST_CTL, EXCLUDE_FROM_RESET, PCIE_NSTCK_RST_CTL, EXCLUDE_FROM_RESET, PCIE_SD_RST_CTL, EXCLUDE_FROM_RESET, EE_RST_CTL, EXCLUDE_FROM_RESET, EXT_PHY_RST_DUR, 0x7 /* 10ms */, SWRST, 1); } falcon_write(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER); EFX_LOG(efx, "waiting for hardware reset\n"); schedule_timeout_uninterruptible(HZ / 20); /* Restore PCI configuration if needed */ if (method == RESET_TYPE_WORLD) { if (FALCON_IS_DUAL_FUNC(efx)) { rc = pci_restore_state(nic_data->pci_dev2); if (rc) { EFX_ERR(efx, "failed to restore PCI config for " "the secondary function\n"); goto fail3; } } rc = pci_restore_state(efx->pci_dev); if (rc) { EFX_ERR(efx, "failed to restore PCI config for the " "primary function\n"); goto fail4; } EFX_LOG(efx, "successfully restored PCI config\n"); } /* Assert that reset complete */ falcon_read(efx, &glb_ctl_reg_ker, GLB_CTL_REG_KER); if (EFX_OWORD_FIELD(glb_ctl_reg_ker, SWRST) != 0) { rc = -ETIMEDOUT; EFX_ERR(efx, "timed out waiting for hardware reset\n"); goto fail5; } EFX_LOG(efx, "hardware reset complete\n"); return 0; /* pci_save_state() and pci_restore_state() MUST be called in pairs */ fail2: fail3: pci_restore_state(efx->pci_dev); fail1: fail4: fail5: return rc; } /* Zeroes out the SRAM contents. This routine must be called in * process context and is allowed to sleep. */ static int falcon_reset_sram(struct efx_nic *efx) { efx_oword_t srm_cfg_reg_ker, gpio_cfg_reg_ker; int count; /* Set the SRAM wake/sleep GPIO appropriately. */ falcon_read(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER); EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OEN, 1); EFX_SET_OWORD_FIELD(gpio_cfg_reg_ker, GPIO1_OUT, 1); falcon_write(efx, &gpio_cfg_reg_ker, GPIO_CTL_REG_KER); /* Initiate SRAM reset */ EFX_POPULATE_OWORD_2(srm_cfg_reg_ker, SRAM_OOB_BT_INIT_EN, 1, SRM_NUM_BANKS_AND_BANK_SIZE, 0); falcon_write(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER); /* Wait for SRAM reset to complete */ count = 0; do { EFX_LOG(efx, "waiting for SRAM reset (attempt %d)...\n", count); /* SRAM reset is slow; expect around 16ms */ schedule_timeout_uninterruptible(HZ / 50); /* Check for reset complete */ falcon_read(efx, &srm_cfg_reg_ker, SRM_CFG_REG_KER); if (!EFX_OWORD_FIELD(srm_cfg_reg_ker, SRAM_OOB_BT_INIT_EN)) { EFX_LOG(efx, "SRAM reset complete\n"); return 0; } } while (++count < 20); /* wait upto 0.4 sec */ EFX_ERR(efx, "timed out waiting for SRAM reset\n"); return -ETIMEDOUT; } /* Extract non-volatile configuration */ static int falcon_probe_nvconfig(struct efx_nic *efx) { struct falcon_nvconfig *nvconfig; efx_oword_t nic_stat; int device_id; unsigned addr_len; size_t offset, len; int magic_num, struct_ver, board_rev; int rc; /* Find the boot device. */ falcon_read(efx, &nic_stat, NIC_STAT_REG); if (EFX_OWORD_FIELD(nic_stat, SF_PRST)) { device_id = EE_SPI_FLASH; addr_len = 3; } else if (EFX_OWORD_FIELD(nic_stat, EE_PRST)) { device_id = EE_SPI_EEPROM; addr_len = 2; } else { return -ENODEV; } nvconfig = kmalloc(sizeof(*nvconfig), GFP_KERNEL); /* Read the whole configuration structure into memory. */ for (offset = 0; offset < sizeof(*nvconfig); offset += len) { len = min(sizeof(*nvconfig) - offset, (size_t) FALCON_SPI_MAX_LEN); rc = falcon_spi_read(efx, device_id, SPI_READ, NVCONFIG_BASE + offset, addr_len, (char *)nvconfig + offset, len); if (rc) goto out; } /* Read the MAC addresses */ memcpy(efx->mac_address, nvconfig->mac_address[0], ETH_ALEN); /* Read the board configuration. */ magic_num = le16_to_cpu(nvconfig->board_magic_num); struct_ver = le16_to_cpu(nvconfig->board_struct_ver); if (magic_num != NVCONFIG_BOARD_MAGIC_NUM || struct_ver < 2) { EFX_ERR(efx, "Non volatile memory bad magic=%x ver=%x " "therefore using defaults\n", magic_num, struct_ver); efx->phy_type = PHY_TYPE_NONE; efx->mii.phy_id = PHY_ADDR_INVALID; board_rev = 0; } else { struct falcon_nvconfig_board_v2 *v2 = &nvconfig->board_v2; efx->phy_type = v2->port0_phy_type; efx->mii.phy_id = v2->port0_phy_addr; board_rev = le16_to_cpu(v2->board_revision); } EFX_LOG(efx, "PHY is %d phy_id %d\n", efx->phy_type, efx->mii.phy_id); efx_set_board_info(efx, board_rev); out: kfree(nvconfig); return rc; } /* Probe the NIC variant (revision, ASIC vs FPGA, function count, port * count, port speed). Set workaround and feature flags accordingly. */ static int falcon_probe_nic_variant(struct efx_nic *efx) { efx_oword_t altera_build; falcon_read(efx, &altera_build, ALTERA_BUILD_REG_KER); if (EFX_OWORD_FIELD(altera_build, VER_ALL)) { EFX_ERR(efx, "Falcon FPGA not supported\n"); return -ENODEV; } switch (FALCON_REV(efx)) { case FALCON_REV_A0: case 0xff: EFX_ERR(efx, "Falcon rev A0 not supported\n"); return -ENODEV; case FALCON_REV_A1:{ efx_oword_t nic_stat; falcon_read(efx, &nic_stat, NIC_STAT_REG); if (EFX_OWORD_FIELD(nic_stat, STRAP_PCIE) == 0) { EFX_ERR(efx, "Falcon rev A1 PCI-X not supported\n"); return -ENODEV; } if (!EFX_OWORD_FIELD(nic_stat, STRAP_10G)) { EFX_ERR(efx, "1G mode not supported\n"); return -ENODEV; } break; } case FALCON_REV_B0: break; default: EFX_ERR(efx, "Unknown Falcon rev %d\n", FALCON_REV(efx)); return -ENODEV; } return 0; } int falcon_probe_nic(struct efx_nic *efx) { struct falcon_nic_data *nic_data; int rc; /* Initialise I2C interface state */ efx->i2c.efx = efx; efx->i2c.op = &falcon_i2c_bit_operations; efx->i2c.sda = 1; efx->i2c.scl = 1; /* Allocate storage for hardware specific data */ nic_data = kzalloc(sizeof(*nic_data), GFP_KERNEL); efx->nic_data = (void *) nic_data; /* Determine number of ports etc. */ rc = falcon_probe_nic_variant(efx); if (rc) goto fail1; /* Probe secondary function if expected */ if (FALCON_IS_DUAL_FUNC(efx)) { struct pci_dev *dev = pci_dev_get(efx->pci_dev); while ((dev = pci_get_device(EFX_VENDID_SFC, FALCON_A_S_DEVID, dev))) { if (dev->bus == efx->pci_dev->bus && dev->devfn == efx->pci_dev->devfn + 1) { nic_data->pci_dev2 = dev; break; } } if (!nic_data->pci_dev2) { EFX_ERR(efx, "failed to find secondary function\n"); rc = -ENODEV; goto fail2; } } /* Now we can reset the NIC */ rc = falcon_reset_hw(efx, RESET_TYPE_ALL); if (rc) { EFX_ERR(efx, "failed to reset NIC\n"); goto fail3; } /* Allocate memory for INT_KER */ rc = falcon_alloc_buffer(efx, &efx->irq_status, sizeof(efx_oword_t)); if (rc) goto fail4; BUG_ON(efx->irq_status.dma_addr & 0x0f); EFX_LOG(efx, "INT_KER at %llx (virt %p phys %lx)\n", (unsigned long long)efx->irq_status.dma_addr, efx->irq_status.addr, virt_to_phys(efx->irq_status.addr)); /* Read in the non-volatile configuration */ rc = falcon_probe_nvconfig(efx); if (rc) goto fail5; return 0; fail5: falcon_free_buffer(efx, &efx->irq_status); fail4: fail3: if (nic_data->pci_dev2) { pci_dev_put(nic_data->pci_dev2); nic_data->pci_dev2 = NULL; } fail2: fail1: kfree(efx->nic_data); return rc; } /* This call performs hardware-specific global initialisation, such as * defining the descriptor cache sizes and number of RSS channels. * It does not set up any buffers, descriptor rings or event queues. */ int falcon_init_nic(struct efx_nic *efx) { struct falcon_nic_data *data; efx_oword_t temp; unsigned thresh; int rc; data = (struct falcon_nic_data *)efx->nic_data; /* Set up the address region register. This is only needed * for the B0 FPGA, but since we are just pushing in the * reset defaults this may as well be unconditional. */ EFX_POPULATE_OWORD_4(temp, ADR_REGION0, 0, ADR_REGION1, (1 << 16), ADR_REGION2, (2 << 16), ADR_REGION3, (3 << 16)); falcon_write(efx, &temp, ADR_REGION_REG_KER); /* Use on-chip SRAM */ falcon_read(efx, &temp, NIC_STAT_REG); EFX_SET_OWORD_FIELD(temp, ONCHIP_SRAM, 1); falcon_write(efx, &temp, NIC_STAT_REG); /* Set buffer table mode */ EFX_POPULATE_OWORD_1(temp, BUF_TBL_MODE, BUF_TBL_MODE_FULL); falcon_write(efx, &temp, BUF_TBL_CFG_REG_KER); rc = falcon_reset_sram(efx); if (rc) return rc; /* Set positions of descriptor caches in SRAM. */ EFX_POPULATE_OWORD_1(temp, SRM_TX_DC_BASE_ADR, TX_DC_BASE / 8); falcon_write(efx, &temp, SRM_TX_DC_CFG_REG_KER); EFX_POPULATE_OWORD_1(temp, SRM_RX_DC_BASE_ADR, RX_DC_BASE / 8); falcon_write(efx, &temp, SRM_RX_DC_CFG_REG_KER); /* Set TX descriptor cache size. */ BUILD_BUG_ON(TX_DC_ENTRIES != (16 << TX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, TX_DC_SIZE, TX_DC_ENTRIES_ORDER); falcon_write(efx, &temp, TX_DC_CFG_REG_KER); /* Set RX descriptor cache size. Set low watermark to size-8, as * this allows most efficient prefetching. */ BUILD_BUG_ON(RX_DC_ENTRIES != (16 << RX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, RX_DC_SIZE, RX_DC_ENTRIES_ORDER); falcon_write(efx, &temp, RX_DC_CFG_REG_KER); EFX_POPULATE_OWORD_1(temp, RX_DC_PF_LWM, RX_DC_ENTRIES - 8); falcon_write(efx, &temp, RX_DC_PF_WM_REG_KER); /* Clear the parity enables on the TX data fifos as * they produce false parity errors because of timing issues */ if (EFX_WORKAROUND_5129(efx)) { falcon_read(efx, &temp, SPARE_REG_KER); EFX_SET_OWORD_FIELD(temp, MEM_PERR_EN_TX_DATA, 0); falcon_write(efx, &temp, SPARE_REG_KER); } /* Enable all the genuinely fatal interrupts. (They are still * masked by the overall interrupt mask, controlled by * falcon_interrupts()). * * Note: All other fatal interrupts are enabled */ EFX_POPULATE_OWORD_3(temp, ILL_ADR_INT_KER_EN, 1, RBUF_OWN_INT_KER_EN, 1, TBUF_OWN_INT_KER_EN, 1); EFX_INVERT_OWORD(temp); falcon_write(efx, &temp, FATAL_INTR_REG_KER); /* Set number of RSS queues for receive path. */ falcon_read(efx, &temp, RX_FILTER_CTL_REG); if (FALCON_REV(efx) >= FALCON_REV_B0) EFX_SET_OWORD_FIELD(temp, NUM_KER, 0); else EFX_SET_OWORD_FIELD(temp, NUM_KER, efx->rss_queues - 1); if (EFX_WORKAROUND_7244(efx)) { EFX_SET_OWORD_FIELD(temp, UDP_FULL_SRCH_LIMIT, 8); EFX_SET_OWORD_FIELD(temp, UDP_WILD_SRCH_LIMIT, 8); EFX_SET_OWORD_FIELD(temp, TCP_FULL_SRCH_LIMIT, 8); EFX_SET_OWORD_FIELD(temp, TCP_WILD_SRCH_LIMIT, 8); } falcon_write(efx, &temp, RX_FILTER_CTL_REG); falcon_setup_rss_indir_table(efx); /* Setup RX. Wait for descriptor is broken and must * be disabled. RXDP recovery shouldn't be needed, but is. */ falcon_read(efx, &temp, RX_SELF_RST_REG_KER); EFX_SET_OWORD_FIELD(temp, RX_NODESC_WAIT_DIS, 1); EFX_SET_OWORD_FIELD(temp, RX_RECOVERY_EN, 1); if (EFX_WORKAROUND_5583(efx)) EFX_SET_OWORD_FIELD(temp, RX_ISCSI_DIS, 1); falcon_write(efx, &temp, RX_SELF_RST_REG_KER); /* Disable the ugly timer-based TX DMA backoff and allow TX DMA to be * controlled by the RX FIFO fill level. Set arbitration to one pkt/Q. */ falcon_read(efx, &temp, TX_CFG2_REG_KER); EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER, 0xfe); EFX_SET_OWORD_FIELD(temp, TX_RX_SPACER_EN, 1); EFX_SET_OWORD_FIELD(temp, TX_ONE_PKT_PER_Q, 1); EFX_SET_OWORD_FIELD(temp, TX_CSR_PUSH_EN, 0); EFX_SET_OWORD_FIELD(temp, TX_DIS_NON_IP_EV, 1); /* Enable SW_EV to inherit in char driver - assume harmless here */ EFX_SET_OWORD_FIELD(temp, TX_SW_EV_EN, 1); /* Prefetch threshold 2 => fetch when descriptor cache half empty */ EFX_SET_OWORD_FIELD(temp, TX_PREF_THRESHOLD, 2); /* Squash TX of packets of 16 bytes or less */ if (FALCON_REV(efx) >= FALCON_REV_B0 && EFX_WORKAROUND_9141(efx)) EFX_SET_OWORD_FIELD(temp, TX_FLUSH_MIN_LEN_EN_B0, 1); falcon_write(efx, &temp, TX_CFG2_REG_KER); /* Do not enable TX_NO_EOP_DISC_EN, since it limits packets to 16 * descriptors (which is bad). */ falcon_read(efx, &temp, TX_CFG_REG_KER); EFX_SET_OWORD_FIELD(temp, TX_NO_EOP_DISC_EN, 0); falcon_write(efx, &temp, TX_CFG_REG_KER); /* RX config */ falcon_read(efx, &temp, RX_CFG_REG_KER); EFX_SET_OWORD_FIELD_VER(efx, temp, RX_DESC_PUSH_EN, 0); if (EFX_WORKAROUND_7575(efx)) EFX_SET_OWORD_FIELD_VER(efx, temp, RX_USR_BUF_SIZE, (3 * 4096) / 32); if (FALCON_REV(efx) >= FALCON_REV_B0) EFX_SET_OWORD_FIELD(temp, RX_INGR_EN_B0, 1); /* RX FIFO flow control thresholds */ thresh = ((rx_xon_thresh_bytes >= 0) ? rx_xon_thresh_bytes : efx->type->rx_xon_thresh); EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_MAC_TH, thresh / 256); thresh = ((rx_xoff_thresh_bytes >= 0) ? rx_xoff_thresh_bytes : efx->type->rx_xoff_thresh); EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_MAC_TH, thresh / 256); /* RX control FIFO thresholds [32 entries] */ EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XON_TX_TH, 25); EFX_SET_OWORD_FIELD_VER(efx, temp, RX_XOFF_TX_TH, 20); falcon_write(efx, &temp, RX_CFG_REG_KER); /* Set destination of both TX and RX Flush events */ if (FALCON_REV(efx) >= FALCON_REV_B0) { EFX_POPULATE_OWORD_1(temp, FLS_EVQ_ID, 0); falcon_write(efx, &temp, DP_CTRL_REG); } return 0; } void falcon_remove_nic(struct efx_nic *efx) { struct falcon_nic_data *nic_data = efx->nic_data; falcon_free_buffer(efx, &efx->irq_status); (void) falcon_reset_hw(efx, RESET_TYPE_ALL); /* Release the second function after the reset */ if (nic_data->pci_dev2) { pci_dev_put(nic_data->pci_dev2); nic_data->pci_dev2 = NULL; } /* Tear down the private nic state */ kfree(efx->nic_data); efx->nic_data = NULL; } void falcon_update_nic_stats(struct efx_nic *efx) { efx_oword_t cnt; falcon_read(efx, &cnt, RX_NODESC_DROP_REG_KER); efx->n_rx_nodesc_drop_cnt += EFX_OWORD_FIELD(cnt, RX_NODESC_DROP_CNT); } /************************************************************************** * * Revision-dependent attributes used by efx.c * ************************************************************************** */ struct efx_nic_type falcon_a_nic_type = { .mem_bar = 2, .mem_map_size = 0x20000, .txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_A1, .rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_A1, .buf_tbl_base = BUF_TBL_KER_A1, .evq_ptr_tbl_base = EVQ_PTR_TBL_KER_A1, .evq_rptr_tbl_base = EVQ_RPTR_REG_KER_A1, .txd_ring_mask = FALCON_TXD_RING_MASK, .rxd_ring_mask = FALCON_RXD_RING_MASK, .evq_size = FALCON_EVQ_SIZE, .max_dma_mask = FALCON_DMA_MASK, .tx_dma_mask = FALCON_TX_DMA_MASK, .bug5391_mask = 0xf, .rx_xoff_thresh = 2048, .rx_xon_thresh = 512, .rx_buffer_padding = 0x24, .max_interrupt_mode = EFX_INT_MODE_MSI, .phys_addr_channels = 4, }; struct efx_nic_type falcon_b_nic_type = { .mem_bar = 2, /* Map everything up to and including the RSS indirection * table. Don't map MSI-X table, MSI-X PBA since Linux * requires that they not be mapped. */ .mem_map_size = RX_RSS_INDIR_TBL_B0 + 0x800, .txd_ptr_tbl_base = TX_DESC_PTR_TBL_KER_B0, .rxd_ptr_tbl_base = RX_DESC_PTR_TBL_KER_B0, .buf_tbl_base = BUF_TBL_KER_B0, .evq_ptr_tbl_base = EVQ_PTR_TBL_KER_B0, .evq_rptr_tbl_base = EVQ_RPTR_REG_KER_B0, .txd_ring_mask = FALCON_TXD_RING_MASK, .rxd_ring_mask = FALCON_RXD_RING_MASK, .evq_size = FALCON_EVQ_SIZE, .max_dma_mask = FALCON_DMA_MASK, .tx_dma_mask = FALCON_TX_DMA_MASK, .bug5391_mask = 0, .rx_xoff_thresh = 54272, /* ~80Kb - 3*max MTU */ .rx_xon_thresh = 27648, /* ~3*max MTU */ .rx_buffer_padding = 0, .max_interrupt_mode = EFX_INT_MODE_MSIX, .phys_addr_channels = 32, /* Hardware limit is 64, but the legacy * interrupt handler only supports 32 * channels */ };