/**************************************************************************** * 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 "nic.h" #include "regs.h" #include "io.h" #include "workarounds.h" /************************************************************************** * * Configurable values * ************************************************************************** */ /* 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 1 #define RX_DC_ENTRIES 64 #define RX_DC_ENTRIES_ORDER 3 /* 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 */ int efx_nic_rx_xoff_thresh = -1; module_param_named(rx_xoff_thresh_bytes, efx_nic_rx_xoff_thresh, 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 */ int efx_nic_rx_xon_thresh = -1; module_param_named(rx_xon_thresh_bytes, efx_nic_rx_xon_thresh, int, 0644); MODULE_PARM_DESC(rx_xon_thresh_bytes, "RX fifo XON threshold"); /* If EFX_MAX_INT_ERRORS internal errors occur within * EFX_INT_ERROR_EXPIRE seconds, we consider the NIC broken and * disable it. */ #define EFX_INT_ERROR_EXPIRE 3600 #define EFX_MAX_INT_ERRORS 5 /* We poll for events every FLUSH_INTERVAL ms, and check FLUSH_POLL_COUNT times */ #define EFX_FLUSH_INTERVAL 10 #define EFX_FLUSH_POLL_COUNT 100 /* Size and alignment of special buffers (4KB) */ #define EFX_BUF_SIZE 4096 /* Depth of RX flush request fifo */ #define EFX_RX_FLUSH_COUNT 4 /************************************************************************** * * Solarstorm hardware access * **************************************************************************/ static inline void efx_write_buf_tbl(struct efx_nic *efx, efx_qword_t *value, unsigned int index) { efx_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base, value, index); } /* Read the current event from the event queue */ static inline efx_qword_t *efx_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 efx_event_present(efx_qword_t *event) { return (!(EFX_DWORD_IS_ALL_ONES(event->dword[0]) | EFX_DWORD_IS_ALL_ONES(event->dword[1]))); } static bool efx_masked_compare_oword(const efx_oword_t *a, const efx_oword_t *b, const efx_oword_t *mask) { return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) || ((a->u64[1] ^ b->u64[1]) & mask->u64[1]); } int efx_nic_test_registers(struct efx_nic *efx, const struct efx_nic_register_test *regs, size_t n_regs) { unsigned address = 0, i, j; efx_oword_t mask, imask, original, reg, buf; /* Falcon should be in loopback to isolate the XMAC from the PHY */ WARN_ON(!LOOPBACK_INTERNAL(efx)); for (i = 0; i < n_regs; ++i) { address = regs[i].address; mask = imask = regs[i].mask; EFX_INVERT_OWORD(imask); efx_reado(efx, &original, address); /* bit sweep on and off */ for (j = 0; j < 128; j++) { if (!EFX_EXTRACT_OWORD32(mask, j, j)) continue; /* Test this testable bit can be set in isolation */ EFX_AND_OWORD(reg, original, mask); EFX_SET_OWORD32(reg, j, j, 1); efx_writeo(efx, ®, address); efx_reado(efx, &buf, address); if (efx_masked_compare_oword(®, &buf, &mask)) goto fail; /* Test this testable bit can be cleared in isolation */ EFX_OR_OWORD(reg, original, mask); EFX_SET_OWORD32(reg, j, j, 0); efx_writeo(efx, ®, address); efx_reado(efx, &buf, address); if (efx_masked_compare_oword(®, &buf, &mask)) goto fail; } efx_writeo(efx, &original, address); } return 0; fail: EFX_ERR(efx, "wrote "EFX_OWORD_FMT" read "EFX_OWORD_FMT " at address 0x%x mask "EFX_OWORD_FMT"\n", EFX_OWORD_VAL(reg), EFX_OWORD_VAL(buf), address, EFX_OWORD_VAL(mask)); return -EIO; } /************************************************************************** * * Special buffer handling * Special buffers are used for event queues and the TX and RX * descriptor rings. * *************************************************************************/ /* * Initialise a special buffer * * This will define a buffer (previously allocated via * efx_alloc_special_buffer()) in the buffer table, allowing * it to be used for event queues, descriptor rings etc. */ static void efx_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_3(buf_desc, FRF_AZ_BUF_ADR_REGION, 0, FRF_AZ_BUF_ADR_FBUF, dma_addr >> 12, FRF_AZ_BUF_OWNER_ID_FBUF, 0); efx_write_buf_tbl(efx, &buf_desc, index); } } /* Unmaps a buffer and clears the buffer table entries */ static void efx_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, FRF_AZ_BUF_UPD_CMD, 0, FRF_AZ_BUF_CLR_CMD, 1, FRF_AZ_BUF_CLR_END_ID, end, FRF_AZ_BUF_CLR_START_ID, start); efx_writeo(efx, &buf_tbl_upd, FR_AZ_BUF_TBL_UPD); } /* * Allocate a new special buffer * * This allocates memory for a new buffer, clears it and allocates a * new buffer ID range. It does not write into the buffer table. * * This call will allocate 4KB buffers, since 8KB buffers can't be * used for event queues and descriptor rings. */ static int efx_alloc_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer, unsigned int len) { len = ALIGN(len, EFX_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 / EFX_BUF_SIZE; BUG_ON(buffer->dma_addr & (EFX_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 = efx->next_buffer_table; efx->next_buffer_table += buffer->entries; EFX_LOG(efx, "allocating special buffers %d-%d at %llx+%x " "(virt %p phys %llx)\n", buffer->index, buffer->index + buffer->entries - 1, (u64)buffer->dma_addr, len, buffer->addr, (u64)virt_to_phys(buffer->addr)); return 0; } static void efx_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 %llx)\n", buffer->index, buffer->index + buffer->entries - 1, (u64)buffer->dma_addr, buffer->len, buffer->addr, (u64)virt_to_phys(buffer->addr)); pci_free_consistent(efx->pci_dev, buffer->len, buffer->addr, buffer->dma_addr); buffer->addr = NULL; buffer->entries = 0; } /************************************************************************** * * Generic buffer handling * These buffers are used for interrupt status and MAC stats * **************************************************************************/ int efx_nic_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; } void efx_nic_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; } } /************************************************************************** * * 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 * efx_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 efx_notify_tx_desc(struct efx_tx_queue *tx_queue) { unsigned write_ptr; efx_dword_t reg; write_ptr = tx_queue->write_count & EFX_TXQ_MASK; EFX_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr); efx_writed_page(tx_queue->efx, ®, FR_AZ_TX_DESC_UPD_DWORD_P0, 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 efx_nic_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 & EFX_TXQ_MASK; buffer = &tx_queue->buffer[write_ptr]; txd = efx_tx_desc(tx_queue, write_ptr); ++tx_queue->write_count; /* Create TX descriptor ring entry */ EFX_POPULATE_QWORD_4(*txd, FSF_AZ_TX_KER_CONT, buffer->continuation, FSF_AZ_TX_KER_BYTE_COUNT, buffer->len, FSF_AZ_TX_KER_BUF_REGION, 0, FSF_AZ_TX_KER_BUF_ADDR, buffer->dma_addr); } while (tx_queue->write_count != tx_queue->insert_count); wmb(); /* Ensure descriptors are written before they are fetched */ efx_notify_tx_desc(tx_queue); } /* Allocate hardware resources for a TX queue */ int efx_nic_probe_tx(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; BUILD_BUG_ON(EFX_TXQ_SIZE < 512 || EFX_TXQ_SIZE > 4096 || EFX_TXQ_SIZE & EFX_TXQ_MASK); return efx_alloc_special_buffer(efx, &tx_queue->txd, EFX_TXQ_SIZE * sizeof(efx_qword_t)); } void efx_nic_init_tx(struct efx_tx_queue *tx_queue) { efx_oword_t tx_desc_ptr; struct efx_nic *efx = tx_queue->efx; tx_queue->flushed = FLUSH_NONE; /* Pin TX descriptor ring */ efx_init_special_buffer(efx, &tx_queue->txd); /* Push TX descriptor ring to card */ EFX_POPULATE_OWORD_10(tx_desc_ptr, FRF_AZ_TX_DESCQ_EN, 1, FRF_AZ_TX_ISCSI_DDIG_EN, 0, FRF_AZ_TX_ISCSI_HDIG_EN, 0, FRF_AZ_TX_DESCQ_BUF_BASE_ID, tx_queue->txd.index, FRF_AZ_TX_DESCQ_EVQ_ID, tx_queue->channel->channel, FRF_AZ_TX_DESCQ_OWNER_ID, 0, FRF_AZ_TX_DESCQ_LABEL, tx_queue->queue, FRF_AZ_TX_DESCQ_SIZE, __ffs(tx_queue->txd.entries), FRF_AZ_TX_DESCQ_TYPE, 0, FRF_BZ_TX_NON_IP_DROP_DIS, 1); if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) { int csum = tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM; EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_IP_CHKSM_DIS, !csum); EFX_SET_OWORD_FIELD(tx_desc_ptr, FRF_BZ_TX_TCP_CHKSM_DIS, !csum); } efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base, tx_queue->queue); if (efx_nic_rev(efx) < EFX_REV_FALCON_B0) { efx_oword_t reg; /* Only 128 bits in this register */ BUILD_BUG_ON(EFX_TX_QUEUE_COUNT >= 128); efx_reado(efx, ®, FR_AA_TX_CHKSM_CFG); if (tx_queue->queue == EFX_TX_QUEUE_OFFLOAD_CSUM) clear_bit_le(tx_queue->queue, (void *)®); else set_bit_le(tx_queue->queue, (void *)®); efx_writeo(efx, ®, FR_AA_TX_CHKSM_CFG); } } static void efx_flush_tx_queue(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; efx_oword_t tx_flush_descq; tx_queue->flushed = FLUSH_PENDING; /* Post a flush command */ EFX_POPULATE_OWORD_2(tx_flush_descq, FRF_AZ_TX_FLUSH_DESCQ_CMD, 1, FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue); efx_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ); } void efx_nic_fini_tx(struct efx_tx_queue *tx_queue) { struct efx_nic *efx = tx_queue->efx; efx_oword_t tx_desc_ptr; /* The queue should have been flushed */ WARN_ON(tx_queue->flushed != FLUSH_DONE); /* Remove TX descriptor ring from card */ EFX_ZERO_OWORD(tx_desc_ptr); efx_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base, tx_queue->queue); /* Unpin TX descriptor ring */ efx_fini_special_buffer(efx, &tx_queue->txd); } /* Free buffers backing TX queue */ void efx_nic_remove_tx(struct efx_tx_queue *tx_queue) { efx_free_special_buffer(tx_queue->efx, &tx_queue->txd); } /************************************************************************** * * RX path * **************************************************************************/ /* Returns a pointer to the specified descriptor in the RX descriptor queue */ static inline efx_qword_t * efx_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 efx_build_rx_desc(struct efx_rx_queue *rx_queue, unsigned index) { struct efx_rx_buffer *rx_buf; efx_qword_t *rxd; rxd = efx_rx_desc(rx_queue, index); rx_buf = efx_rx_buffer(rx_queue, index); EFX_POPULATE_QWORD_3(*rxd, FSF_AZ_RX_KER_BUF_SIZE, rx_buf->len - rx_queue->efx->type->rx_buffer_padding, FSF_AZ_RX_KER_BUF_REGION, 0, FSF_AZ_RX_KER_BUF_ADDR, rx_buf->dma_addr); } /* This writes to the RX_DESC_WPTR register for the specified receive * descriptor ring. */ void efx_nic_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) { efx_build_rx_desc(rx_queue, rx_queue->notified_count & EFX_RXQ_MASK); ++rx_queue->notified_count; } wmb(); write_ptr = rx_queue->added_count & EFX_RXQ_MASK; EFX_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr); efx_writed_page(rx_queue->efx, ®, FR_AZ_RX_DESC_UPD_DWORD_P0, rx_queue->queue); } int efx_nic_probe_rx(struct efx_rx_queue *rx_queue) { struct efx_nic *efx = rx_queue->efx; BUILD_BUG_ON(EFX_RXQ_SIZE < 512 || EFX_RXQ_SIZE > 4096 || EFX_RXQ_SIZE & EFX_RXQ_MASK); return efx_alloc_special_buffer(efx, &rx_queue->rxd, EFX_RXQ_SIZE * sizeof(efx_qword_t)); } void efx_nic_init_rx(struct efx_rx_queue *rx_queue) { efx_oword_t rx_desc_ptr; struct efx_nic *efx = rx_queue->efx; bool is_b0 = efx_nic_rev(efx) >= EFX_REV_FALCON_B0; bool 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); rx_queue->flushed = FLUSH_NONE; /* Pin RX descriptor ring */ efx_init_special_buffer(efx, &rx_queue->rxd); /* Push RX descriptor ring to card */ EFX_POPULATE_OWORD_10(rx_desc_ptr, FRF_AZ_RX_ISCSI_DDIG_EN, iscsi_digest_en, FRF_AZ_RX_ISCSI_HDIG_EN, iscsi_digest_en, FRF_AZ_RX_DESCQ_BUF_BASE_ID, rx_queue->rxd.index, FRF_AZ_RX_DESCQ_EVQ_ID, rx_queue->channel->channel, FRF_AZ_RX_DESCQ_OWNER_ID, 0, FRF_AZ_RX_DESCQ_LABEL, rx_queue->queue, FRF_AZ_RX_DESCQ_SIZE, __ffs(rx_queue->rxd.entries), FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ , /* For >=B0 this is scatter so disable */ FRF_AZ_RX_DESCQ_JUMBO, !is_b0, FRF_AZ_RX_DESCQ_EN, 1); efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, rx_queue->queue); } static void efx_flush_rx_queue(struct efx_rx_queue *rx_queue) { struct efx_nic *efx = rx_queue->efx; efx_oword_t rx_flush_descq; rx_queue->flushed = FLUSH_PENDING; /* Post a flush command */ EFX_POPULATE_OWORD_2(rx_flush_descq, FRF_AZ_RX_FLUSH_DESCQ_CMD, 1, FRF_AZ_RX_FLUSH_DESCQ, rx_queue->queue); efx_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ); } void efx_nic_fini_rx(struct efx_rx_queue *rx_queue) { efx_oword_t rx_desc_ptr; struct efx_nic *efx = rx_queue->efx; /* The queue should already have been flushed */ WARN_ON(rx_queue->flushed != FLUSH_DONE); /* Remove RX descriptor ring from card */ EFX_ZERO_OWORD(rx_desc_ptr); efx_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, rx_queue->queue); /* Unpin RX descriptor ring */ efx_fini_special_buffer(efx, &rx_queue->rxd); } /* Free buffers backing RX queue */ void efx_nic_remove_rx(struct efx_rx_queue *rx_queue) { efx_free_special_buffer(rx_queue->efx, &rx_queue->rxd); } /************************************************************************** * * 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 efx_nic_eventq_read_ack(struct efx_channel *channel) { efx_dword_t reg; struct efx_nic *efx = channel->efx; EFX_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR, channel->eventq_read_ptr); efx_writed_table(efx, ®, efx->type->evq_rptr_tbl_base, channel->channel); } /* Use HW to insert a SW defined event */ void efx_generate_event(struct efx_channel *channel, efx_qword_t *event) { efx_oword_t drv_ev_reg; BUILD_BUG_ON(FRF_AZ_DRV_EV_DATA_LBN != 0 || FRF_AZ_DRV_EV_DATA_WIDTH != 64); drv_ev_reg.u32[0] = event->u32[0]; drv_ev_reg.u32[1] = event->u32[1]; drv_ev_reg.u32[2] = 0; drv_ev_reg.u32[3] = 0; EFX_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, channel->channel); efx_writeo(channel->efx, &drv_ev_reg, FR_AZ_DRV_EV); } /* Handle a transmit completion event * * The NIC batches TX completion events; the message we receive is of * the form "complete all TX events up to this index". */ static void efx_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, FSF_AZ_TX_EV_COMP))) { /* Transmit completion */ tx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR); tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL); tx_queue = &efx->tx_queue[tx_ev_q_label]; channel->irq_mod_score += (tx_ev_desc_ptr - tx_queue->read_count) & EFX_TXQ_MASK; efx_xmit_done(tx_queue, tx_ev_desc_ptr); } else if (EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) { /* Rewrite the FIFO write pointer */ tx_ev_q_label = EFX_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL); tx_queue = &efx->tx_queue[tx_ev_q_label]; if (efx_dev_registered(efx)) netif_tx_lock(efx->net_dev); efx_notify_tx_desc(tx_queue); if (efx_dev_registered(efx)) netif_tx_unlock(efx->net_dev); } else if (EFX_QWORD_FIELD(*event, FSF_AZ_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)); } } /* Detect errors included in the rx_evt_pkt_ok bit. */ static void efx_handle_rx_not_ok(struct efx_rx_queue *rx_queue, const efx_qword_t *event, bool *rx_ev_pkt_ok, bool *discard) { struct efx_nic *efx = rx_queue->efx; bool rx_ev_buf_owner_id_err, rx_ev_ip_hdr_chksum_err; bool rx_ev_tcp_udp_chksum_err, rx_ev_eth_crc_err; bool rx_ev_frm_trunc, rx_ev_drib_nib, rx_ev_tobe_disc; bool rx_ev_other_err, rx_ev_pause_frm; bool rx_ev_hdr_type, rx_ev_mcast_pkt; unsigned rx_ev_pkt_type; rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE); rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT); rx_ev_tobe_disc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC); rx_ev_pkt_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE); rx_ev_buf_owner_id_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_BUF_OWNER_ID_ERR); rx_ev_ip_hdr_chksum_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR); rx_ev_tcp_udp_chksum_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR); rx_ev_eth_crc_err = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR); rx_ev_frm_trunc = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC); rx_ev_drib_nib = ((efx_nic_rev(efx) >= EFX_REV_FALCON_B0) ? 0 : EFX_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB)); rx_ev_pause_frm = EFX_QWORD_FIELD(*event, FSF_AZ_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); /* Count errors that are not in MAC stats. Ignore expected * checksum errors during self-test. */ 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 (!efx->loopback_selftest) { 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; } /* 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\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]" : ""); } #endif } /* Handle receive events that are not in-order. */ static void efx_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 & EFX_RXQ_MASK; dropped = (index - expected) & EFX_RXQ_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 * * The NIC 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 void efx_handle_rx_event(struct efx_channel *channel, const efx_qword_t *event) { unsigned int rx_ev_desc_ptr, rx_ev_byte_cnt; unsigned int rx_ev_hdr_type, rx_ev_mcast_pkt; unsigned expected_ptr; bool rx_ev_pkt_ok, discard = false, checksummed; struct efx_rx_queue *rx_queue; struct efx_nic *efx = channel->efx; /* Basic packet information */ rx_ev_byte_cnt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT); rx_ev_pkt_ok = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK); rx_ev_hdr_type = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE); WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT)); WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP) != 1); WARN_ON(EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) != channel->channel); rx_queue = &efx->rx_queue[channel->channel]; rx_ev_desc_ptr = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR); expected_ptr = rx_queue->removed_count & EFX_RXQ_MASK; if (unlikely(rx_ev_desc_ptr != expected_ptr)) efx_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr); if (likely(rx_ev_pkt_ok)) { /* If packet is marked as OK and packet type is TCP/IP or * UDP/IP, then we can rely on the hardware checksum. */ checksummed = likely(efx->rx_checksum_enabled) && (rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_TCP || rx_ev_hdr_type == FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_UDP); } else { efx_handle_rx_not_ok(rx_queue, event, &rx_ev_pkt_ok, &discard); checksummed = false; } /* Detect multicast packets that didn't match the filter */ rx_ev_mcast_pkt = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT); if (rx_ev_mcast_pkt) { unsigned int rx_ev_mcast_hash_match = EFX_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH); if (unlikely(!rx_ev_mcast_hash_match)) { ++channel->n_rx_mcast_mismatch; discard = true; } } channel->irq_mod_score += 2; /* Handle received packet */ efx_rx_packet(rx_queue, rx_ev_desc_ptr, rx_ev_byte_cnt, checksummed, discard); } /* Global events are basically PHY events */ static void efx_handle_global_event(struct efx_channel *channel, efx_qword_t *event) { struct efx_nic *efx = channel->efx; bool handled = false; if (EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_G_PHY0_INTR) || EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XG_PHY0_INTR) || EFX_QWORD_FIELD(*event, FSF_AB_GLB_EV_XFP_PHY0_INTR)) { /* Ignored */ handled = true; } if ((efx_nic_rev(efx) >= EFX_REV_FALCON_B0) && EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_XG_MGT_INTR)) { efx->xmac_poll_required = true; handled = true; } if (efx_nic_rev(efx) <= EFX_REV_FALCON_A1 ? EFX_QWORD_FIELD(*event, FSF_AA_GLB_EV_RX_RECOVERY) : EFX_QWORD_FIELD(*event, FSF_BB_GLB_EV_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 = true; } if (!handled) EFX_ERR(efx, "channel %d unknown global event " EFX_QWORD_FMT "\n", channel->channel, EFX_QWORD_VAL(*event)); } static void efx_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, FSF_AZ_DRIVER_EV_SUBCODE); ev_sub_data = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA); switch (ev_sub_code) { case FSE_AZ_TX_DESCQ_FLS_DONE_EV: EFX_TRACE(efx, "channel %d TXQ %d flushed\n", channel->channel, ev_sub_data); break; case FSE_AZ_RX_DESCQ_FLS_DONE_EV: EFX_TRACE(efx, "channel %d RXQ %d flushed\n", channel->channel, ev_sub_data); break; case FSE_AZ_EVQ_INIT_DONE_EV: EFX_LOG(efx, "channel %d EVQ %d initialised\n", channel->channel, ev_sub_data); break; case FSE_AZ_SRM_UPD_DONE_EV: EFX_TRACE(efx, "channel %d SRAM update done\n", channel->channel); break; case FSE_AZ_WAKE_UP_EV: EFX_TRACE(efx, "channel %d RXQ %d wakeup event\n", channel->channel, ev_sub_data); break; case FSE_AZ_TIMER_EV: EFX_TRACE(efx, "channel %d RX queue %d timer expired\n", channel->channel, ev_sub_data); break; case FSE_AA_RX_RECOVER_EV: 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 FSE_BZ_RX_DSC_ERROR_EV: 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 FSE_BZ_TX_DSC_ERROR_EV: 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 efx_nic_process_eventq(struct efx_channel *channel, int rx_quota) { unsigned int read_ptr; efx_qword_t event, *p_event; int ev_code; int rx_packets = 0; read_ptr = channel->eventq_read_ptr; do { p_event = efx_event(channel, read_ptr); event = *p_event; if (!efx_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, FSF_AZ_EV_CODE); switch (ev_code) { case FSE_AZ_EV_CODE_RX_EV: efx_handle_rx_event(channel, &event); ++rx_packets; break; case FSE_AZ_EV_CODE_TX_EV: efx_handle_tx_event(channel, &event); break; case FSE_AZ_EV_CODE_DRV_GEN_EV: channel->eventq_magic = EFX_QWORD_FIELD( event, FSF_AZ_DRV_GEN_EV_MAGIC); EFX_LOG(channel->efx, "channel %d received generated " "event "EFX_QWORD_FMT"\n", channel->channel, EFX_QWORD_VAL(event)); break; case FSE_AZ_EV_CODE_GLOBAL_EV: efx_handle_global_event(channel, &event); break; case FSE_AZ_EV_CODE_DRIVER_EV: efx_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) & EFX_EVQ_MASK; } while (rx_packets < rx_quota); channel->eventq_read_ptr = read_ptr; return rx_packets; } /* Allocate buffer table entries for event queue */ int efx_nic_probe_eventq(struct efx_channel *channel) { struct efx_nic *efx = channel->efx; BUILD_BUG_ON(EFX_EVQ_SIZE < 512 || EFX_EVQ_SIZE > 32768 || EFX_EVQ_SIZE & EFX_EVQ_MASK); return efx_alloc_special_buffer(efx, &channel->eventq, EFX_EVQ_SIZE * sizeof(efx_qword_t)); } void efx_nic_init_eventq(struct efx_channel *channel) { efx_oword_t evq_ptr; struct efx_nic *efx = channel->efx; 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 */ efx_init_special_buffer(efx, &channel->eventq); /* 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, FRF_AZ_EVQ_EN, 1, FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries), FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index); efx_writeo_table(efx, &evq_ptr, efx->type->evq_ptr_tbl_base, channel->channel); efx->type->push_irq_moderation(channel); } void efx_nic_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); efx_writeo_table(efx, &eventq_ptr, efx->type->evq_ptr_tbl_base, channel->channel); /* Unpin event queue */ efx_fini_special_buffer(efx, &channel->eventq); } /* Free buffers backing event queue */ void efx_nic_remove_eventq(struct efx_channel *channel) { efx_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 efx_nic_generate_test_event(struct efx_channel *channel, unsigned int magic) { efx_qword_t test_event; EFX_POPULATE_QWORD_2(test_event, FSF_AZ_EV_CODE, FSE_AZ_EV_CODE_DRV_GEN_EV, FSF_AZ_DRV_GEN_EV_MAGIC, magic); efx_generate_event(channel, &test_event); } /************************************************************************** * * Flush handling * **************************************************************************/ static void efx_poll_flush_events(struct efx_nic *efx) { struct efx_channel *channel = &efx->channel[0]; struct efx_tx_queue *tx_queue; struct efx_rx_queue *rx_queue; unsigned int read_ptr = channel->eventq_read_ptr; unsigned int end_ptr = (read_ptr - 1) & EFX_EVQ_MASK; do { efx_qword_t *event = efx_event(channel, read_ptr); int ev_code, ev_sub_code, ev_queue; bool ev_failed; if (!efx_event_present(event)) break; ev_code = EFX_QWORD_FIELD(*event, FSF_AZ_EV_CODE); ev_sub_code = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE); if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV && ev_sub_code == FSE_AZ_TX_DESCQ_FLS_DONE_EV) { ev_queue = EFX_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA); if (ev_queue < EFX_TX_QUEUE_COUNT) { tx_queue = efx->tx_queue + ev_queue; tx_queue->flushed = FLUSH_DONE; } } else if (ev_code == FSE_AZ_EV_CODE_DRIVER_EV && ev_sub_code == FSE_AZ_RX_DESCQ_FLS_DONE_EV) { ev_queue = EFX_QWORD_FIELD( *event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID); ev_failed = EFX_QWORD_FIELD( *event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL); if (ev_queue < efx->n_rx_queues) { rx_queue = efx->rx_queue + ev_queue; rx_queue->flushed = ev_failed ? FLUSH_FAILED : FLUSH_DONE; } } /* We're about to destroy the queue anyway, so * it's ok to throw away every non-flush event */ EFX_SET_QWORD(*event); read_ptr = (read_ptr + 1) & EFX_EVQ_MASK; } while (read_ptr != end_ptr); channel->eventq_read_ptr = read_ptr; } /* Handle tx and rx flushes at the same time, since they run in * parallel in the hardware and there's no reason for us to * serialise them */ int efx_nic_flush_queues(struct efx_nic *efx) { struct efx_rx_queue *rx_queue; struct efx_tx_queue *tx_queue; int i, tx_pending, rx_pending; /* If necessary prepare the hardware for flushing */ efx->type->prepare_flush(efx); /* Flush all tx queues in parallel */ efx_for_each_tx_queue(tx_queue, efx) efx_flush_tx_queue(tx_queue); /* The hardware supports four concurrent rx flushes, each of which may * need to be retried if there is an outstanding descriptor fetch */ for (i = 0; i < EFX_FLUSH_POLL_COUNT; ++i) { rx_pending = tx_pending = 0; efx_for_each_rx_queue(rx_queue, efx) { if (rx_queue->flushed == FLUSH_PENDING) ++rx_pending; } efx_for_each_rx_queue(rx_queue, efx) { if (rx_pending == EFX_RX_FLUSH_COUNT) break; if (rx_queue->flushed == FLUSH_FAILED || rx_queue->flushed == FLUSH_NONE) { efx_flush_rx_queue(rx_queue); ++rx_pending; } } efx_for_each_tx_queue(tx_queue, efx) { if (tx_queue->flushed != FLUSH_DONE) ++tx_pending; } if (rx_pending == 0 && tx_pending == 0) return 0; msleep(EFX_FLUSH_INTERVAL); efx_poll_flush_events(efx); } /* Mark the queues as all flushed. We're going to return failure * leading to a reset, or fake up success anyway */ efx_for_each_tx_queue(tx_queue, efx) { if (tx_queue->flushed != FLUSH_DONE) EFX_ERR(efx, "tx queue %d flush command timed out\n", tx_queue->queue); tx_queue->flushed = FLUSH_DONE; } efx_for_each_rx_queue(rx_queue, efx) { if (rx_queue->flushed != FLUSH_DONE) EFX_ERR(efx, "rx queue %d flush command timed out\n", rx_queue->queue); rx_queue->flushed = FLUSH_DONE; } if (EFX_WORKAROUND_7803(efx)) return 0; return -ETIMEDOUT; } /************************************************************************** * * 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 interrupts */ static inline void efx_nic_interrupts(struct efx_nic *efx, bool enabled, bool force) { efx_oword_t int_en_reg_ker; EFX_POPULATE_OWORD_2(int_en_reg_ker, FRF_AZ_KER_INT_KER, force, FRF_AZ_DRV_INT_EN_KER, enabled); efx_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER); } void efx_nic_enable_interrupts(struct efx_nic *efx) { struct efx_channel *channel; EFX_ZERO_OWORD(*((efx_oword_t *) efx->irq_status.addr)); wmb(); /* Ensure interrupt vector is clear before interrupts enabled */ /* Enable interrupts */ efx_nic_interrupts(efx, true, false); /* Force processing of all the channels to get the EVQ RPTRs up to date */ efx_for_each_channel(channel, efx) efx_schedule_channel(channel); } void efx_nic_disable_interrupts(struct efx_nic *efx) { /* Disable interrupts */ efx_nic_interrupts(efx, false, false); } /* Generate a test interrupt * Interrupt must already have been enabled, otherwise nasty things * may happen. */ void efx_nic_generate_interrupt(struct efx_nic *efx) { efx_nic_interrupts(efx, true, true); } /* Process a fatal interrupt * Disable bus mastering ASAP and schedule a reset */ irqreturn_t efx_nic_fatal_interrupt(struct efx_nic *efx) { struct falcon_nic_data *nic_data = efx->nic_data; efx_oword_t *int_ker = efx->irq_status.addr; efx_oword_t fatal_intr; int error, mem_perr; efx_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER); error = EFX_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR); 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, FRF_AZ_MEM_PERR_INT_KER); if (mem_perr) { efx_oword_t reg; efx_reado(efx, ®, FR_AZ_MEM_STAT); EFX_ERR(efx, "SYSTEM ERROR: memory parity error " EFX_OWORD_FMT "\n", EFX_OWORD_VAL(reg)); } /* Disable both devices */ pci_clear_master(efx->pci_dev); if (efx_nic_is_dual_func(efx)) pci_clear_master(nic_data->pci_dev2); efx_nic_disable_interrupts(efx); /* Count errors and reset or disable the NIC accordingly */ if (efx->int_error_count == 0 || time_after(jiffies, efx->int_error_expire)) { efx->int_error_count = 0; efx->int_error_expire = jiffies + EFX_INT_ERROR_EXPIRE * HZ; } if (++efx->int_error_count < EFX_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 * Acknowledges the interrupt and schedule event queue processing. */ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id) { struct efx_nic *efx = dev_id; efx_oword_t *int_ker = efx->irq_status.addr; irqreturn_t result = IRQ_NONE; struct efx_channel *channel; efx_dword_t reg; u32 queues; int syserr; /* Read the ISR which also ACKs the interrupts */ efx_readd(efx, ®, FR_BZ_INT_ISR0); queues = EFX_EXTRACT_DWORD(reg, 0, 31); /* Check to see if we have a serious error condition */ syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT); if (unlikely(syserr)) return efx_nic_fatal_interrupt(efx); /* Schedule processing of any interrupting queues */ efx_for_each_channel(channel, efx) { if ((queues & 1) || efx_event_present( efx_event(channel, channel->eventq_read_ptr))) { efx_schedule_channel(channel); result = IRQ_HANDLED; } queues >>= 1; } if (result == IRQ_HANDLED) { 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)); } return result; } /* Handle an MSI interrupt * * 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 efx_msi_interrupt(int irq, void *dev_id) { struct efx_channel *channel = dev_id; struct efx_nic *efx = channel->efx; efx_oword_t *int_ker = 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, FSF_AZ_NET_IVEC_FATAL_INT); if (unlikely(syserr)) return efx_nic_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 efx_setup_rss_indir_table(struct efx_nic *efx) { int i = 0; unsigned long offset; efx_dword_t dword; if (efx_nic_rev(efx) < EFX_REV_FALCON_B0) return; for (offset = FR_BZ_RX_INDIRECTION_TBL; offset < FR_BZ_RX_INDIRECTION_TBL + 0x800; offset += 0x10) { EFX_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE, i % efx->n_rx_queues); efx_writed(efx, &dword, offset); i++; } } /* Hook interrupt handler(s) * Try MSI and then legacy interrupts. */ int efx_nic_init_interrupt(struct efx_nic *efx) { struct efx_channel *channel; int rc; if (!EFX_INT_MODE_USE_MSI(efx)) { irq_handler_t handler; if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) handler = efx_legacy_interrupt; 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(channel, efx) { rc = request_irq(channel->irq, efx_msi_interrupt, IRQF_PROBE_SHARED, /* Not shared */ channel->name, channel); if (rc) { EFX_ERR(efx, "failed to hook IRQ %d\n", channel->irq); goto fail2; } } return 0; fail2: efx_for_each_channel(channel, efx) free_irq(channel->irq, channel); fail1: return rc; } void efx_nic_fini_interrupt(struct efx_nic *efx) { struct efx_channel *channel; efx_oword_t reg; /* Disable MSI/MSI-X interrupts */ efx_for_each_channel(channel, efx) { if (channel->irq) free_irq(channel->irq, channel); } /* ACK legacy interrupt */ if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) efx_reado(efx, ®, FR_BZ_INT_ISR0); else falcon_irq_ack_a1(efx); /* Disable legacy interrupt */ if (efx->legacy_irq) free_irq(efx->legacy_irq, efx); } u32 efx_nic_fpga_ver(struct efx_nic *efx) { efx_oword_t altera_build; efx_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD); return EFX_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER); } void efx_nic_init_common(struct efx_nic *efx) { efx_oword_t temp; /* Set positions of descriptor caches in SRAM. */ EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR, efx->type->tx_dc_base / 8); efx_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG); EFX_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR, efx->type->rx_dc_base / 8); efx_writeo(efx, &temp, FR_AZ_SRM_RX_DC_CFG); /* Set TX descriptor cache size. */ BUILD_BUG_ON(TX_DC_ENTRIES != (8 << TX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER); efx_writeo(efx, &temp, FR_AZ_TX_DC_CFG); /* Set RX descriptor cache size. Set low watermark to size-8, as * this allows most efficient prefetching. */ BUILD_BUG_ON(RX_DC_ENTRIES != (8 << RX_DC_ENTRIES_ORDER)); EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER); efx_writeo(efx, &temp, FR_AZ_RX_DC_CFG); EFX_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8); efx_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM); /* Program INT_KER address */ EFX_POPULATE_OWORD_2(temp, FRF_AZ_NORM_INT_VEC_DIS_KER, EFX_INT_MODE_USE_MSI(efx), FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr); efx_writeo(efx, &temp, FR_AZ_INT_ADR_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, FRF_AZ_ILL_ADR_INT_KER_EN, 1, FRF_AZ_RBUF_OWN_INT_KER_EN, 1, FRF_AZ_TBUF_OWN_INT_KER_EN, 1); EFX_INVERT_OWORD(temp); efx_writeo(efx, &temp, FR_AZ_FATAL_INTR_KER); efx_setup_rss_indir_table(efx); /* 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. */ efx_reado(efx, &temp, FR_AZ_TX_RESERVED); EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe); EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1); EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1); EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 0); EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1); /* Enable SW_EV to inherit in char driver - assume harmless here */ EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1); /* Prefetch threshold 2 => fetch when descriptor cache half empty */ EFX_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2); /* Squash TX of packets of 16 bytes or less */ if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0) EFX_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1); efx_writeo(efx, &temp, FR_AZ_TX_RESERVED); }