diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/falcon/farch.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/falcon/farch.c | 2892 |
1 files changed, 2892 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/falcon/farch.c b/drivers/net/ethernet/sfc/falcon/farch.c new file mode 100644 index 000000000000..05916c710d8c --- /dev/null +++ b/drivers/net/ethernet/sfc/falcon/farch.c @@ -0,0 +1,2892 @@ +/**************************************************************************** + * Driver for Solarflare network controllers and boards + * Copyright 2005-2006 Fen Systems Ltd. + * Copyright 2006-2013 Solarflare Communications Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/pci.h> +#include <linux/module.h> +#include <linux/seq_file.h> +#include <linux/crc32.h> +#include "net_driver.h" +#include "bitfield.h" +#include "efx.h" +#include "nic.h" +#include "farch_regs.h" +#include "io.h" +#include "workarounds.h" + +/* Falcon-architecture (SFC4000) support */ + +/************************************************************************** + * + * 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 + +/* If EF4_MAX_INT_ERRORS internal errors occur within + * EF4_INT_ERROR_EXPIRE seconds, we consider the NIC broken and + * disable it. + */ +#define EF4_INT_ERROR_EXPIRE 3600 +#define EF4_MAX_INT_ERRORS 5 + +/* Depth of RX flush request fifo */ +#define EF4_RX_FLUSH_COUNT 4 + +/* Driver generated events */ +#define _EF4_CHANNEL_MAGIC_TEST 0x000101 +#define _EF4_CHANNEL_MAGIC_FILL 0x000102 +#define _EF4_CHANNEL_MAGIC_RX_DRAIN 0x000103 +#define _EF4_CHANNEL_MAGIC_TX_DRAIN 0x000104 + +#define _EF4_CHANNEL_MAGIC(_code, _data) ((_code) << 8 | (_data)) +#define _EF4_CHANNEL_MAGIC_CODE(_magic) ((_magic) >> 8) + +#define EF4_CHANNEL_MAGIC_TEST(_channel) \ + _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_TEST, (_channel)->channel) +#define EF4_CHANNEL_MAGIC_FILL(_rx_queue) \ + _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_FILL, \ + ef4_rx_queue_index(_rx_queue)) +#define EF4_CHANNEL_MAGIC_RX_DRAIN(_rx_queue) \ + _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_RX_DRAIN, \ + ef4_rx_queue_index(_rx_queue)) +#define EF4_CHANNEL_MAGIC_TX_DRAIN(_tx_queue) \ + _EF4_CHANNEL_MAGIC(_EF4_CHANNEL_MAGIC_TX_DRAIN, \ + (_tx_queue)->queue) + +static void ef4_farch_magic_event(struct ef4_channel *channel, u32 magic); + +/************************************************************************** + * + * Hardware access + * + **************************************************************************/ + +static inline void ef4_write_buf_tbl(struct ef4_nic *efx, ef4_qword_t *value, + unsigned int index) +{ + ef4_sram_writeq(efx, efx->membase + efx->type->buf_tbl_base, + value, index); +} + +static bool ef4_masked_compare_oword(const ef4_oword_t *a, const ef4_oword_t *b, + const ef4_oword_t *mask) +{ + return ((a->u64[0] ^ b->u64[0]) & mask->u64[0]) || + ((a->u64[1] ^ b->u64[1]) & mask->u64[1]); +} + +int ef4_farch_test_registers(struct ef4_nic *efx, + const struct ef4_farch_register_test *regs, + size_t n_regs) +{ + unsigned address = 0; + int i, j; + ef4_oword_t mask, imask, original, reg, buf; + + for (i = 0; i < n_regs; ++i) { + address = regs[i].address; + mask = imask = regs[i].mask; + EF4_INVERT_OWORD(imask); + + ef4_reado(efx, &original, address); + + /* bit sweep on and off */ + for (j = 0; j < 128; j++) { + if (!EF4_EXTRACT_OWORD32(mask, j, j)) + continue; + + /* Test this testable bit can be set in isolation */ + EF4_AND_OWORD(reg, original, mask); + EF4_SET_OWORD32(reg, j, j, 1); + + ef4_writeo(efx, ®, address); + ef4_reado(efx, &buf, address); + + if (ef4_masked_compare_oword(®, &buf, &mask)) + goto fail; + + /* Test this testable bit can be cleared in isolation */ + EF4_OR_OWORD(reg, original, mask); + EF4_SET_OWORD32(reg, j, j, 0); + + ef4_writeo(efx, ®, address); + ef4_reado(efx, &buf, address); + + if (ef4_masked_compare_oword(®, &buf, &mask)) + goto fail; + } + + ef4_writeo(efx, &original, address); + } + + return 0; + +fail: + netif_err(efx, hw, efx->net_dev, + "wrote "EF4_OWORD_FMT" read "EF4_OWORD_FMT + " at address 0x%x mask "EF4_OWORD_FMT"\n", EF4_OWORD_VAL(reg), + EF4_OWORD_VAL(buf), address, EF4_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 + * ef4_alloc_special_buffer()) in the buffer table, allowing + * it to be used for event queues, descriptor rings etc. + */ +static void +ef4_init_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer) +{ + ef4_qword_t buf_desc; + unsigned int index; + dma_addr_t dma_addr; + int i; + + EF4_BUG_ON_PARANOID(!buffer->buf.addr); + + /* Write buffer descriptors to NIC */ + for (i = 0; i < buffer->entries; i++) { + index = buffer->index + i; + dma_addr = buffer->buf.dma_addr + (i * EF4_BUF_SIZE); + netif_dbg(efx, probe, efx->net_dev, + "mapping special buffer %d at %llx\n", + index, (unsigned long long)dma_addr); + EF4_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); + ef4_write_buf_tbl(efx, &buf_desc, index); + } +} + +/* Unmaps a buffer and clears the buffer table entries */ +static void +ef4_fini_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer) +{ + ef4_oword_t buf_tbl_upd; + unsigned int start = buffer->index; + unsigned int end = (buffer->index + buffer->entries - 1); + + if (!buffer->entries) + return; + + netif_dbg(efx, hw, efx->net_dev, "unmapping special buffers %d-%d\n", + buffer->index, buffer->index + buffer->entries - 1); + + EF4_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); + ef4_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 ef4_alloc_special_buffer(struct ef4_nic *efx, + struct ef4_special_buffer *buffer, + unsigned int len) +{ + len = ALIGN(len, EF4_BUF_SIZE); + + if (ef4_nic_alloc_buffer(efx, &buffer->buf, len, GFP_KERNEL)) + return -ENOMEM; + buffer->entries = len / EF4_BUF_SIZE; + BUG_ON(buffer->buf.dma_addr & (EF4_BUF_SIZE - 1)); + + /* Select new buffer ID */ + buffer->index = efx->next_buffer_table; + efx->next_buffer_table += buffer->entries; + + netif_dbg(efx, probe, efx->net_dev, + "allocating special buffers %d-%d at %llx+%x " + "(virt %p phys %llx)\n", buffer->index, + buffer->index + buffer->entries - 1, + (u64)buffer->buf.dma_addr, len, + buffer->buf.addr, (u64)virt_to_phys(buffer->buf.addr)); + + return 0; +} + +static void +ef4_free_special_buffer(struct ef4_nic *efx, struct ef4_special_buffer *buffer) +{ + if (!buffer->buf.addr) + return; + + netif_dbg(efx, hw, efx->net_dev, + "deallocating special buffers %d-%d at %llx+%x " + "(virt %p phys %llx)\n", buffer->index, + buffer->index + buffer->entries - 1, + (u64)buffer->buf.dma_addr, buffer->buf.len, + buffer->buf.addr, (u64)virt_to_phys(buffer->buf.addr)); + + ef4_nic_free_buffer(efx, &buffer->buf); + buffer->entries = 0; +} + +/************************************************************************** + * + * TX path + * + **************************************************************************/ + +/* This writes to the TX_DESC_WPTR; write pointer for TX descriptor ring */ +static inline void ef4_farch_notify_tx_desc(struct ef4_tx_queue *tx_queue) +{ + unsigned write_ptr; + ef4_dword_t reg; + + write_ptr = tx_queue->write_count & tx_queue->ptr_mask; + EF4_POPULATE_DWORD_1(reg, FRF_AZ_TX_DESC_WPTR_DWORD, write_ptr); + ef4_writed_page(tx_queue->efx, ®, + FR_AZ_TX_DESC_UPD_DWORD_P0, tx_queue->queue); +} + +/* Write pointer and first descriptor for TX descriptor ring */ +static inline void ef4_farch_push_tx_desc(struct ef4_tx_queue *tx_queue, + const ef4_qword_t *txd) +{ + unsigned write_ptr; + ef4_oword_t reg; + + BUILD_BUG_ON(FRF_AZ_TX_DESC_LBN != 0); + BUILD_BUG_ON(FR_AA_TX_DESC_UPD_KER != FR_BZ_TX_DESC_UPD_P0); + + write_ptr = tx_queue->write_count & tx_queue->ptr_mask; + EF4_POPULATE_OWORD_2(reg, FRF_AZ_TX_DESC_PUSH_CMD, true, + FRF_AZ_TX_DESC_WPTR, write_ptr); + reg.qword[0] = *txd; + ef4_writeo_page(tx_queue->efx, ®, + FR_BZ_TX_DESC_UPD_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 ef4_farch_tx_write(struct ef4_tx_queue *tx_queue) +{ + struct ef4_tx_buffer *buffer; + ef4_qword_t *txd; + unsigned write_ptr; + unsigned old_write_count = tx_queue->write_count; + + tx_queue->xmit_more_available = false; + if (unlikely(tx_queue->write_count == tx_queue->insert_count)) + return; + + do { + write_ptr = tx_queue->write_count & tx_queue->ptr_mask; + buffer = &tx_queue->buffer[write_ptr]; + txd = ef4_tx_desc(tx_queue, write_ptr); + ++tx_queue->write_count; + + EF4_BUG_ON_PARANOID(buffer->flags & EF4_TX_BUF_OPTION); + + /* Create TX descriptor ring entry */ + BUILD_BUG_ON(EF4_TX_BUF_CONT != 1); + EF4_POPULATE_QWORD_4(*txd, + FSF_AZ_TX_KER_CONT, + buffer->flags & EF4_TX_BUF_CONT, + 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 */ + + if (ef4_nic_may_push_tx_desc(tx_queue, old_write_count)) { + txd = ef4_tx_desc(tx_queue, + old_write_count & tx_queue->ptr_mask); + ef4_farch_push_tx_desc(tx_queue, txd); + ++tx_queue->pushes; + } else { + ef4_farch_notify_tx_desc(tx_queue); + } +} + +unsigned int ef4_farch_tx_limit_len(struct ef4_tx_queue *tx_queue, + dma_addr_t dma_addr, unsigned int len) +{ + /* Don't cross 4K boundaries with descriptors. */ + unsigned int limit = (~dma_addr & (EF4_PAGE_SIZE - 1)) + 1; + + len = min(limit, len); + + if (EF4_WORKAROUND_5391(tx_queue->efx) && (dma_addr & 0xf)) + len = min_t(unsigned int, len, 512 - (dma_addr & 0xf)); + + return len; +} + + +/* Allocate hardware resources for a TX queue */ +int ef4_farch_tx_probe(struct ef4_tx_queue *tx_queue) +{ + struct ef4_nic *efx = tx_queue->efx; + unsigned entries; + + entries = tx_queue->ptr_mask + 1; + return ef4_alloc_special_buffer(efx, &tx_queue->txd, + entries * sizeof(ef4_qword_t)); +} + +void ef4_farch_tx_init(struct ef4_tx_queue *tx_queue) +{ + struct ef4_nic *efx = tx_queue->efx; + ef4_oword_t reg; + + /* Pin TX descriptor ring */ + ef4_init_special_buffer(efx, &tx_queue->txd); + + /* Push TX descriptor ring to card */ + EF4_POPULATE_OWORD_10(reg, + 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 (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) { + int csum = tx_queue->queue & EF4_TXQ_TYPE_OFFLOAD; + EF4_SET_OWORD_FIELD(reg, FRF_BZ_TX_IP_CHKSM_DIS, !csum); + EF4_SET_OWORD_FIELD(reg, FRF_BZ_TX_TCP_CHKSM_DIS, + !csum); + } + + ef4_writeo_table(efx, ®, efx->type->txd_ptr_tbl_base, + tx_queue->queue); + + if (ef4_nic_rev(efx) < EF4_REV_FALCON_B0) { + /* Only 128 bits in this register */ + BUILD_BUG_ON(EF4_MAX_TX_QUEUES > 128); + + ef4_reado(efx, ®, FR_AA_TX_CHKSM_CFG); + if (tx_queue->queue & EF4_TXQ_TYPE_OFFLOAD) + __clear_bit_le(tx_queue->queue, ®); + else + __set_bit_le(tx_queue->queue, ®); + ef4_writeo(efx, ®, FR_AA_TX_CHKSM_CFG); + } + + if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) { + EF4_POPULATE_OWORD_1(reg, + FRF_BZ_TX_PACE, + (tx_queue->queue & EF4_TXQ_TYPE_HIGHPRI) ? + FFE_BZ_TX_PACE_OFF : + FFE_BZ_TX_PACE_RESERVED); + ef4_writeo_table(efx, ®, FR_BZ_TX_PACE_TBL, + tx_queue->queue); + } +} + +static void ef4_farch_flush_tx_queue(struct ef4_tx_queue *tx_queue) +{ + struct ef4_nic *efx = tx_queue->efx; + ef4_oword_t tx_flush_descq; + + WARN_ON(atomic_read(&tx_queue->flush_outstanding)); + atomic_set(&tx_queue->flush_outstanding, 1); + + EF4_POPULATE_OWORD_2(tx_flush_descq, + FRF_AZ_TX_FLUSH_DESCQ_CMD, 1, + FRF_AZ_TX_FLUSH_DESCQ, tx_queue->queue); + ef4_writeo(efx, &tx_flush_descq, FR_AZ_TX_FLUSH_DESCQ); +} + +void ef4_farch_tx_fini(struct ef4_tx_queue *tx_queue) +{ + struct ef4_nic *efx = tx_queue->efx; + ef4_oword_t tx_desc_ptr; + + /* Remove TX descriptor ring from card */ + EF4_ZERO_OWORD(tx_desc_ptr); + ef4_writeo_table(efx, &tx_desc_ptr, efx->type->txd_ptr_tbl_base, + tx_queue->queue); + + /* Unpin TX descriptor ring */ + ef4_fini_special_buffer(efx, &tx_queue->txd); +} + +/* Free buffers backing TX queue */ +void ef4_farch_tx_remove(struct ef4_tx_queue *tx_queue) +{ + ef4_free_special_buffer(tx_queue->efx, &tx_queue->txd); +} + +/************************************************************************** + * + * RX path + * + **************************************************************************/ + +/* This creates an entry in the RX descriptor queue */ +static inline void +ef4_farch_build_rx_desc(struct ef4_rx_queue *rx_queue, unsigned index) +{ + struct ef4_rx_buffer *rx_buf; + ef4_qword_t *rxd; + + rxd = ef4_rx_desc(rx_queue, index); + rx_buf = ef4_rx_buffer(rx_queue, index); + EF4_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 ef4_farch_rx_write(struct ef4_rx_queue *rx_queue) +{ + struct ef4_nic *efx = rx_queue->efx; + ef4_dword_t reg; + unsigned write_ptr; + + while (rx_queue->notified_count != rx_queue->added_count) { + ef4_farch_build_rx_desc( + rx_queue, + rx_queue->notified_count & rx_queue->ptr_mask); + ++rx_queue->notified_count; + } + + wmb(); + write_ptr = rx_queue->added_count & rx_queue->ptr_mask; + EF4_POPULATE_DWORD_1(reg, FRF_AZ_RX_DESC_WPTR_DWORD, write_ptr); + ef4_writed_page(efx, ®, FR_AZ_RX_DESC_UPD_DWORD_P0, + ef4_rx_queue_index(rx_queue)); +} + +int ef4_farch_rx_probe(struct ef4_rx_queue *rx_queue) +{ + struct ef4_nic *efx = rx_queue->efx; + unsigned entries; + + entries = rx_queue->ptr_mask + 1; + return ef4_alloc_special_buffer(efx, &rx_queue->rxd, + entries * sizeof(ef4_qword_t)); +} + +void ef4_farch_rx_init(struct ef4_rx_queue *rx_queue) +{ + ef4_oword_t rx_desc_ptr; + struct ef4_nic *efx = rx_queue->efx; + bool is_b0 = ef4_nic_rev(efx) >= EF4_REV_FALCON_B0; + bool iscsi_digest_en = is_b0; + bool jumbo_en; + + /* For kernel-mode queues in Falcon A1, the JUMBO flag enables + * DMA to continue after a PCIe page boundary (and scattering + * is not possible). In Falcon B0 and Siena, it enables + * scatter. + */ + jumbo_en = !is_b0 || efx->rx_scatter; + + netif_dbg(efx, hw, efx->net_dev, + "RX queue %d ring in special buffers %d-%d\n", + ef4_rx_queue_index(rx_queue), rx_queue->rxd.index, + rx_queue->rxd.index + rx_queue->rxd.entries - 1); + + rx_queue->scatter_n = 0; + + /* Pin RX descriptor ring */ + ef4_init_special_buffer(efx, &rx_queue->rxd); + + /* Push RX descriptor ring to card */ + EF4_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, + ef4_rx_queue_channel(rx_queue)->channel, + FRF_AZ_RX_DESCQ_OWNER_ID, 0, + FRF_AZ_RX_DESCQ_LABEL, + ef4_rx_queue_index(rx_queue), + FRF_AZ_RX_DESCQ_SIZE, + __ffs(rx_queue->rxd.entries), + FRF_AZ_RX_DESCQ_TYPE, 0 /* kernel queue */ , + FRF_AZ_RX_DESCQ_JUMBO, jumbo_en, + FRF_AZ_RX_DESCQ_EN, 1); + ef4_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, + ef4_rx_queue_index(rx_queue)); +} + +static void ef4_farch_flush_rx_queue(struct ef4_rx_queue *rx_queue) +{ + struct ef4_nic *efx = rx_queue->efx; + ef4_oword_t rx_flush_descq; + + EF4_POPULATE_OWORD_2(rx_flush_descq, + FRF_AZ_RX_FLUSH_DESCQ_CMD, 1, + FRF_AZ_RX_FLUSH_DESCQ, + ef4_rx_queue_index(rx_queue)); + ef4_writeo(efx, &rx_flush_descq, FR_AZ_RX_FLUSH_DESCQ); +} + +void ef4_farch_rx_fini(struct ef4_rx_queue *rx_queue) +{ + ef4_oword_t rx_desc_ptr; + struct ef4_nic *efx = rx_queue->efx; + + /* Remove RX descriptor ring from card */ + EF4_ZERO_OWORD(rx_desc_ptr); + ef4_writeo_table(efx, &rx_desc_ptr, efx->type->rxd_ptr_tbl_base, + ef4_rx_queue_index(rx_queue)); + + /* Unpin RX descriptor ring */ + ef4_fini_special_buffer(efx, &rx_queue->rxd); +} + +/* Free buffers backing RX queue */ +void ef4_farch_rx_remove(struct ef4_rx_queue *rx_queue) +{ + ef4_free_special_buffer(rx_queue->efx, &rx_queue->rxd); +} + +/************************************************************************** + * + * Flush handling + * + **************************************************************************/ + +/* ef4_farch_flush_queues() must be woken up when all flushes are completed, + * or more RX flushes can be kicked off. + */ +static bool ef4_farch_flush_wake(struct ef4_nic *efx) +{ + /* Ensure that all updates are visible to ef4_farch_flush_queues() */ + smp_mb(); + + return (atomic_read(&efx->active_queues) == 0 || + (atomic_read(&efx->rxq_flush_outstanding) < EF4_RX_FLUSH_COUNT + && atomic_read(&efx->rxq_flush_pending) > 0)); +} + +static bool ef4_check_tx_flush_complete(struct ef4_nic *efx) +{ + bool i = true; + ef4_oword_t txd_ptr_tbl; + struct ef4_channel *channel; + struct ef4_tx_queue *tx_queue; + + ef4_for_each_channel(channel, efx) { + ef4_for_each_channel_tx_queue(tx_queue, channel) { + ef4_reado_table(efx, &txd_ptr_tbl, + FR_BZ_TX_DESC_PTR_TBL, tx_queue->queue); + if (EF4_OWORD_FIELD(txd_ptr_tbl, + FRF_AZ_TX_DESCQ_FLUSH) || + EF4_OWORD_FIELD(txd_ptr_tbl, + FRF_AZ_TX_DESCQ_EN)) { + netif_dbg(efx, hw, efx->net_dev, + "flush did not complete on TXQ %d\n", + tx_queue->queue); + i = false; + } else if (atomic_cmpxchg(&tx_queue->flush_outstanding, + 1, 0)) { + /* The flush is complete, but we didn't + * receive a flush completion event + */ + netif_dbg(efx, hw, efx->net_dev, + "flush complete on TXQ %d, so drain " + "the queue\n", tx_queue->queue); + /* Don't need to increment active_queues as it + * has already been incremented for the queues + * which did not drain + */ + ef4_farch_magic_event(channel, + EF4_CHANNEL_MAGIC_TX_DRAIN( + tx_queue)); + } + } + } + + return i; +} + +/* Flush all the transmit queues, and continue flushing receive queues until + * they're all flushed. Wait for the DRAIN events to be received so that there + * are no more RX and TX events left on any channel. */ +static int ef4_farch_do_flush(struct ef4_nic *efx) +{ + unsigned timeout = msecs_to_jiffies(5000); /* 5s for all flushes and drains */ + struct ef4_channel *channel; + struct ef4_rx_queue *rx_queue; + struct ef4_tx_queue *tx_queue; + int rc = 0; + + ef4_for_each_channel(channel, efx) { + ef4_for_each_channel_tx_queue(tx_queue, channel) { + ef4_farch_flush_tx_queue(tx_queue); + } + ef4_for_each_channel_rx_queue(rx_queue, channel) { + rx_queue->flush_pending = true; + atomic_inc(&efx->rxq_flush_pending); + } + } + + while (timeout && atomic_read(&efx->active_queues) > 0) { + /* The hardware supports four concurrent rx flushes, each of + * which may need to be retried if there is an outstanding + * descriptor fetch + */ + ef4_for_each_channel(channel, efx) { + ef4_for_each_channel_rx_queue(rx_queue, channel) { + if (atomic_read(&efx->rxq_flush_outstanding) >= + EF4_RX_FLUSH_COUNT) + break; + + if (rx_queue->flush_pending) { + rx_queue->flush_pending = false; + atomic_dec(&efx->rxq_flush_pending); + atomic_inc(&efx->rxq_flush_outstanding); + ef4_farch_flush_rx_queue(rx_queue); + } + } + } + + timeout = wait_event_timeout(efx->flush_wq, + ef4_farch_flush_wake(efx), + timeout); + } + + if (atomic_read(&efx->active_queues) && + !ef4_check_tx_flush_complete(efx)) { + netif_err(efx, hw, efx->net_dev, "failed to flush %d queues " + "(rx %d+%d)\n", atomic_read(&efx->active_queues), + atomic_read(&efx->rxq_flush_outstanding), + atomic_read(&efx->rxq_flush_pending)); + rc = -ETIMEDOUT; + + atomic_set(&efx->active_queues, 0); + atomic_set(&efx->rxq_flush_pending, 0); + atomic_set(&efx->rxq_flush_outstanding, 0); + } + + return rc; +} + +int ef4_farch_fini_dmaq(struct ef4_nic *efx) +{ + struct ef4_channel *channel; + struct ef4_tx_queue *tx_queue; + struct ef4_rx_queue *rx_queue; + int rc = 0; + + /* Do not attempt to write to the NIC during EEH recovery */ + if (efx->state != STATE_RECOVERY) { + /* Only perform flush if DMA is enabled */ + if (efx->pci_dev->is_busmaster) { + efx->type->prepare_flush(efx); + rc = ef4_farch_do_flush(efx); + efx->type->finish_flush(efx); + } + + ef4_for_each_channel(channel, efx) { + ef4_for_each_channel_rx_queue(rx_queue, channel) + ef4_farch_rx_fini(rx_queue); + ef4_for_each_channel_tx_queue(tx_queue, channel) + ef4_farch_tx_fini(tx_queue); + } + } + + return rc; +} + +/* Reset queue and flush accounting after FLR + * + * One possible cause of FLR recovery is that DMA may be failing (eg. if bus + * mastering was disabled), in which case we don't receive (RXQ) flush + * completion events. This means that efx->rxq_flush_outstanding remained at 4 + * after the FLR; also, efx->active_queues was non-zero (as no flush completion + * events were received, and we didn't go through ef4_check_tx_flush_complete()) + * If we don't fix this up, on the next call to ef4_realloc_channels() we won't + * flush any RX queues because efx->rxq_flush_outstanding is at the limit of 4 + * for batched flush requests; and the efx->active_queues gets messed up because + * we keep incrementing for the newly initialised queues, but it never went to + * zero previously. Then we get a timeout every time we try to restart the + * queues, as it doesn't go back to zero when we should be flushing the queues. + */ +void ef4_farch_finish_flr(struct ef4_nic *efx) +{ + atomic_set(&efx->rxq_flush_pending, 0); + atomic_set(&efx->rxq_flush_outstanding, 0); + atomic_set(&efx->active_queues, 0); +} + + +/************************************************************************** + * + * 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. + */ +void ef4_farch_ev_read_ack(struct ef4_channel *channel) +{ + ef4_dword_t reg; + struct ef4_nic *efx = channel->efx; + + EF4_POPULATE_DWORD_1(reg, FRF_AZ_EVQ_RPTR, + channel->eventq_read_ptr & channel->eventq_mask); + + /* For Falcon A1, EVQ_RPTR_KER is documented as having a step size + * of 4 bytes, but it is really 16 bytes just like later revisions. + */ + ef4_writed(efx, ®, + efx->type->evq_rptr_tbl_base + + FR_BZ_EVQ_RPTR_STEP * channel->channel); +} + +/* Use HW to insert a SW defined event */ +void ef4_farch_generate_event(struct ef4_nic *efx, unsigned int evq, + ef4_qword_t *event) +{ + ef4_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; + EF4_SET_OWORD_FIELD(drv_ev_reg, FRF_AZ_DRV_EV_QID, evq); + ef4_writeo(efx, &drv_ev_reg, FR_AZ_DRV_EV); +} + +static void ef4_farch_magic_event(struct ef4_channel *channel, u32 magic) +{ + ef4_qword_t event; + + EF4_POPULATE_QWORD_2(event, FSF_AZ_EV_CODE, + FSE_AZ_EV_CODE_DRV_GEN_EV, + FSF_AZ_DRV_GEN_EV_MAGIC, magic); + ef4_farch_generate_event(channel->efx, channel->channel, &event); +} + +/* 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 int +ef4_farch_handle_tx_event(struct ef4_channel *channel, ef4_qword_t *event) +{ + unsigned int tx_ev_desc_ptr; + unsigned int tx_ev_q_label; + struct ef4_tx_queue *tx_queue; + struct ef4_nic *efx = channel->efx; + int tx_packets = 0; + + if (unlikely(ACCESS_ONCE(efx->reset_pending))) + return 0; + + if (likely(EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_COMP))) { + /* Transmit completion */ + tx_ev_desc_ptr = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_DESC_PTR); + tx_ev_q_label = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL); + tx_queue = ef4_channel_get_tx_queue( + channel, tx_ev_q_label % EF4_TXQ_TYPES); + tx_packets = ((tx_ev_desc_ptr - tx_queue->read_count) & + tx_queue->ptr_mask); + ef4_xmit_done(tx_queue, tx_ev_desc_ptr); + } else if (EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_WQ_FF_FULL)) { + /* Rewrite the FIFO write pointer */ + tx_ev_q_label = EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_Q_LABEL); + tx_queue = ef4_channel_get_tx_queue( + channel, tx_ev_q_label % EF4_TXQ_TYPES); + + netif_tx_lock(efx->net_dev); + ef4_farch_notify_tx_desc(tx_queue); + netif_tx_unlock(efx->net_dev); + } else if (EF4_QWORD_FIELD(*event, FSF_AZ_TX_EV_PKT_ERR)) { + ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR); + } else { + netif_err(efx, tx_err, efx->net_dev, + "channel %d unexpected TX event " + EF4_QWORD_FMT"\n", channel->channel, + EF4_QWORD_VAL(*event)); + } + + return tx_packets; +} + +/* Detect errors included in the rx_evt_pkt_ok bit. */ +static u16 ef4_farch_handle_rx_not_ok(struct ef4_rx_queue *rx_queue, + const ef4_qword_t *event) +{ + struct ef4_channel *channel = ef4_rx_queue_channel(rx_queue); + struct ef4_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 = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE); + rx_ev_mcast_pkt = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT); + rx_ev_tobe_disc = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_TOBE_DISC); + rx_ev_pkt_type = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_TYPE); + rx_ev_buf_owner_id_err = EF4_QWORD_FIELD(*event, + FSF_AZ_RX_EV_BUF_OWNER_ID_ERR); + rx_ev_ip_hdr_chksum_err = EF4_QWORD_FIELD(*event, + FSF_AZ_RX_EV_IP_HDR_CHKSUM_ERR); + rx_ev_tcp_udp_chksum_err = EF4_QWORD_FIELD(*event, + FSF_AZ_RX_EV_TCP_UDP_CHKSUM_ERR); + rx_ev_eth_crc_err = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_ETH_CRC_ERR); + rx_ev_frm_trunc = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_FRM_TRUNC); + rx_ev_drib_nib = ((ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) ? + 0 : EF4_QWORD_FIELD(*event, FSF_AA_RX_EV_DRIB_NIB)); + rx_ev_pause_frm = EF4_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) + ++channel->n_rx_frm_trunc; + else if (rx_ev_tobe_disc) + ++channel->n_rx_tobe_disc; + else if (!efx->loopback_selftest) { + if (rx_ev_ip_hdr_chksum_err) + ++channel->n_rx_ip_hdr_chksum_err; + else if (rx_ev_tcp_udp_chksum_err) + ++channel->n_rx_tcp_udp_chksum_err; + } + + /* 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 DEBUG + if (rx_ev_other_err && net_ratelimit()) { + netif_dbg(efx, rx_err, efx->net_dev, + " RX queue %d unexpected RX event " + EF4_QWORD_FMT "%s%s%s%s%s%s%s%s\n", + ef4_rx_queue_index(rx_queue), EF4_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 + + /* The frame must be discarded if any of these are true. */ + return (rx_ev_eth_crc_err | rx_ev_frm_trunc | rx_ev_drib_nib | + rx_ev_tobe_disc | rx_ev_pause_frm) ? + EF4_RX_PKT_DISCARD : 0; +} + +/* Handle receive events that are not in-order. Return true if this + * can be handled as a partial packet discard, false if it's more + * serious. + */ +static bool +ef4_farch_handle_rx_bad_index(struct ef4_rx_queue *rx_queue, unsigned index) +{ + struct ef4_channel *channel = ef4_rx_queue_channel(rx_queue); + struct ef4_nic *efx = rx_queue->efx; + unsigned expected, dropped; + + if (rx_queue->scatter_n && + index == ((rx_queue->removed_count + rx_queue->scatter_n - 1) & + rx_queue->ptr_mask)) { + ++channel->n_rx_nodesc_trunc; + return true; + } + + expected = rx_queue->removed_count & rx_queue->ptr_mask; + dropped = (index - expected) & rx_queue->ptr_mask; + netif_info(efx, rx_err, efx->net_dev, + "dropped %d events (index=%d expected=%d)\n", + dropped, index, expected); + + ef4_schedule_reset(efx, EF4_WORKAROUND_5676(efx) ? + RESET_TYPE_RX_RECOVERY : RESET_TYPE_DISABLE); + return false; +} + +/* 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 +ef4_farch_handle_rx_event(struct ef4_channel *channel, const ef4_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, rx_ev_sop, rx_ev_cont; + u16 flags; + struct ef4_rx_queue *rx_queue; + struct ef4_nic *efx = channel->efx; + + if (unlikely(ACCESS_ONCE(efx->reset_pending))) + return; + + rx_ev_cont = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_JUMBO_CONT); + rx_ev_sop = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_SOP); + WARN_ON(EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_Q_LABEL) != + channel->channel); + + rx_queue = ef4_channel_get_rx_queue(channel); + + rx_ev_desc_ptr = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_DESC_PTR); + expected_ptr = ((rx_queue->removed_count + rx_queue->scatter_n) & + rx_queue->ptr_mask); + + /* Check for partial drops and other errors */ + if (unlikely(rx_ev_desc_ptr != expected_ptr) || + unlikely(rx_ev_sop != (rx_queue->scatter_n == 0))) { + if (rx_ev_desc_ptr != expected_ptr && + !ef4_farch_handle_rx_bad_index(rx_queue, rx_ev_desc_ptr)) + return; + + /* Discard all pending fragments */ + if (rx_queue->scatter_n) { + ef4_rx_packet( + rx_queue, + rx_queue->removed_count & rx_queue->ptr_mask, + rx_queue->scatter_n, 0, EF4_RX_PKT_DISCARD); + rx_queue->removed_count += rx_queue->scatter_n; + rx_queue->scatter_n = 0; + } + + /* Return if there is no new fragment */ + if (rx_ev_desc_ptr != expected_ptr) + return; + + /* Discard new fragment if not SOP */ + if (!rx_ev_sop) { + ef4_rx_packet( + rx_queue, + rx_queue->removed_count & rx_queue->ptr_mask, + 1, 0, EF4_RX_PKT_DISCARD); + ++rx_queue->removed_count; + return; + } + } + + ++rx_queue->scatter_n; + if (rx_ev_cont) + return; + + rx_ev_byte_cnt = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_BYTE_CNT); + rx_ev_pkt_ok = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_PKT_OK); + rx_ev_hdr_type = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_HDR_TYPE); + + if (likely(rx_ev_pkt_ok)) { + /* If packet is marked as OK then we can rely on the + * hardware checksum and classification. + */ + flags = 0; + switch (rx_ev_hdr_type) { + case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_TCP: + flags |= EF4_RX_PKT_TCP; + /* fall through */ + case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_UDP: + flags |= EF4_RX_PKT_CSUMMED; + /* fall through */ + case FSE_CZ_RX_EV_HDR_TYPE_IPV4V6_OTHER: + case FSE_AZ_RX_EV_HDR_TYPE_OTHER: + break; + } + } else { + flags = ef4_farch_handle_rx_not_ok(rx_queue, event); + } + + /* Detect multicast packets that didn't match the filter */ + rx_ev_mcast_pkt = EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_PKT); + if (rx_ev_mcast_pkt) { + unsigned int rx_ev_mcast_hash_match = + EF4_QWORD_FIELD(*event, FSF_AZ_RX_EV_MCAST_HASH_MATCH); + + if (unlikely(!rx_ev_mcast_hash_match)) { + ++channel->n_rx_mcast_mismatch; + flags |= EF4_RX_PKT_DISCARD; + } + } + + channel->irq_mod_score += 2; + + /* Handle received packet */ + ef4_rx_packet(rx_queue, + rx_queue->removed_count & rx_queue->ptr_mask, + rx_queue->scatter_n, rx_ev_byte_cnt, flags); + rx_queue->removed_count += rx_queue->scatter_n; + rx_queue->scatter_n = 0; +} + +/* If this flush done event corresponds to a &struct ef4_tx_queue, then + * send an %EF4_CHANNEL_MAGIC_TX_DRAIN event to drain the event queue + * of all transmit completions. + */ +static void +ef4_farch_handle_tx_flush_done(struct ef4_nic *efx, ef4_qword_t *event) +{ + struct ef4_tx_queue *tx_queue; + int qid; + + qid = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA); + if (qid < EF4_TXQ_TYPES * efx->n_tx_channels) { + tx_queue = ef4_get_tx_queue(efx, qid / EF4_TXQ_TYPES, + qid % EF4_TXQ_TYPES); + if (atomic_cmpxchg(&tx_queue->flush_outstanding, 1, 0)) { + ef4_farch_magic_event(tx_queue->channel, + EF4_CHANNEL_MAGIC_TX_DRAIN(tx_queue)); + } + } +} + +/* If this flush done event corresponds to a &struct ef4_rx_queue: If the flush + * was successful then send an %EF4_CHANNEL_MAGIC_RX_DRAIN, otherwise add + * the RX queue back to the mask of RX queues in need of flushing. + */ +static void +ef4_farch_handle_rx_flush_done(struct ef4_nic *efx, ef4_qword_t *event) +{ + struct ef4_channel *channel; + struct ef4_rx_queue *rx_queue; + int qid; + bool failed; + + qid = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_DESCQ_ID); + failed = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_RX_FLUSH_FAIL); + if (qid >= efx->n_channels) + return; + channel = ef4_get_channel(efx, qid); + if (!ef4_channel_has_rx_queue(channel)) + return; + rx_queue = ef4_channel_get_rx_queue(channel); + + if (failed) { + netif_info(efx, hw, efx->net_dev, + "RXQ %d flush retry\n", qid); + rx_queue->flush_pending = true; + atomic_inc(&efx->rxq_flush_pending); + } else { + ef4_farch_magic_event(ef4_rx_queue_channel(rx_queue), + EF4_CHANNEL_MAGIC_RX_DRAIN(rx_queue)); + } + atomic_dec(&efx->rxq_flush_outstanding); + if (ef4_farch_flush_wake(efx)) + wake_up(&efx->flush_wq); +} + +static void +ef4_farch_handle_drain_event(struct ef4_channel *channel) +{ + struct ef4_nic *efx = channel->efx; + + WARN_ON(atomic_read(&efx->active_queues) == 0); + atomic_dec(&efx->active_queues); + if (ef4_farch_flush_wake(efx)) + wake_up(&efx->flush_wq); +} + +static void ef4_farch_handle_generated_event(struct ef4_channel *channel, + ef4_qword_t *event) +{ + struct ef4_nic *efx = channel->efx; + struct ef4_rx_queue *rx_queue = + ef4_channel_has_rx_queue(channel) ? + ef4_channel_get_rx_queue(channel) : NULL; + unsigned magic, code; + + magic = EF4_QWORD_FIELD(*event, FSF_AZ_DRV_GEN_EV_MAGIC); + code = _EF4_CHANNEL_MAGIC_CODE(magic); + + if (magic == EF4_CHANNEL_MAGIC_TEST(channel)) { + channel->event_test_cpu = raw_smp_processor_id(); + } else if (rx_queue && magic == EF4_CHANNEL_MAGIC_FILL(rx_queue)) { + /* The queue must be empty, so we won't receive any rx + * events, so ef4_process_channel() won't refill the + * queue. Refill it here */ + ef4_fast_push_rx_descriptors(rx_queue, true); + } else if (rx_queue && magic == EF4_CHANNEL_MAGIC_RX_DRAIN(rx_queue)) { + ef4_farch_handle_drain_event(channel); + } else if (code == _EF4_CHANNEL_MAGIC_TX_DRAIN) { + ef4_farch_handle_drain_event(channel); + } else { + netif_dbg(efx, hw, efx->net_dev, "channel %d received " + "generated event "EF4_QWORD_FMT"\n", + channel->channel, EF4_QWORD_VAL(*event)); + } +} + +static void +ef4_farch_handle_driver_event(struct ef4_channel *channel, ef4_qword_t *event) +{ + struct ef4_nic *efx = channel->efx; + unsigned int ev_sub_code; + unsigned int ev_sub_data; + + ev_sub_code = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBCODE); + ev_sub_data = EF4_QWORD_FIELD(*event, FSF_AZ_DRIVER_EV_SUBDATA); + + switch (ev_sub_code) { + case FSE_AZ_TX_DESCQ_FLS_DONE_EV: + netif_vdbg(efx, hw, efx->net_dev, "channel %d TXQ %d flushed\n", + channel->channel, ev_sub_data); + ef4_farch_handle_tx_flush_done(efx, event); + break; + case FSE_AZ_RX_DESCQ_FLS_DONE_EV: + netif_vdbg(efx, hw, efx->net_dev, "channel %d RXQ %d flushed\n", + channel->channel, ev_sub_data); + ef4_farch_handle_rx_flush_done(efx, event); + break; + case FSE_AZ_EVQ_INIT_DONE_EV: + netif_dbg(efx, hw, efx->net_dev, + "channel %d EVQ %d initialised\n", + channel->channel, ev_sub_data); + break; + case FSE_AZ_SRM_UPD_DONE_EV: + netif_vdbg(efx, hw, efx->net_dev, + "channel %d SRAM update done\n", channel->channel); + break; + case FSE_AZ_WAKE_UP_EV: + netif_vdbg(efx, hw, efx->net_dev, + "channel %d RXQ %d wakeup event\n", + channel->channel, ev_sub_data); + break; + case FSE_AZ_TIMER_EV: + netif_vdbg(efx, hw, efx->net_dev, + "channel %d RX queue %d timer expired\n", + channel->channel, ev_sub_data); + break; + case FSE_AA_RX_RECOVER_EV: + netif_err(efx, rx_err, efx->net_dev, + "channel %d seen DRIVER RX_RESET event. " + "Resetting.\n", channel->channel); + atomic_inc(&efx->rx_reset); + ef4_schedule_reset(efx, + EF4_WORKAROUND_6555(efx) ? + RESET_TYPE_RX_RECOVERY : + RESET_TYPE_DISABLE); + break; + case FSE_BZ_RX_DSC_ERROR_EV: + netif_err(efx, rx_err, efx->net_dev, + "RX DMA Q %d reports descriptor fetch error." + " RX Q %d is disabled.\n", ev_sub_data, + ev_sub_data); + ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR); + break; + case FSE_BZ_TX_DSC_ERROR_EV: + netif_err(efx, tx_err, efx->net_dev, + "TX DMA Q %d reports descriptor fetch error." + " TX Q %d is disabled.\n", ev_sub_data, + ev_sub_data); + ef4_schedule_reset(efx, RESET_TYPE_DMA_ERROR); + break; + default: + netif_vdbg(efx, hw, efx->net_dev, + "channel %d unknown driver event code %d " + "data %04x\n", channel->channel, ev_sub_code, + ev_sub_data); + break; + } +} + +int ef4_farch_ev_process(struct ef4_channel *channel, int budget) +{ + struct ef4_nic *efx = channel->efx; + unsigned int read_ptr; + ef4_qword_t event, *p_event; + int ev_code; + int tx_packets = 0; + int spent = 0; + + if (budget <= 0) + return spent; + + read_ptr = channel->eventq_read_ptr; + + for (;;) { + p_event = ef4_event(channel, read_ptr); + event = *p_event; + + if (!ef4_event_present(&event)) + /* End of events */ + break; + + netif_vdbg(channel->efx, intr, channel->efx->net_dev, + "channel %d event is "EF4_QWORD_FMT"\n", + channel->channel, EF4_QWORD_VAL(event)); + + /* Clear this event by marking it all ones */ + EF4_SET_QWORD(*p_event); + + ++read_ptr; + + ev_code = EF4_QWORD_FIELD(event, FSF_AZ_EV_CODE); + + switch (ev_code) { + case FSE_AZ_EV_CODE_RX_EV: + ef4_farch_handle_rx_event(channel, &event); + if (++spent == budget) + goto out; + break; + case FSE_AZ_EV_CODE_TX_EV: + tx_packets += ef4_farch_handle_tx_event(channel, + &event); + if (tx_packets > efx->txq_entries) { + spent = budget; + goto out; + } + break; + case FSE_AZ_EV_CODE_DRV_GEN_EV: + ef4_farch_handle_generated_event(channel, &event); + break; + case FSE_AZ_EV_CODE_DRIVER_EV: + ef4_farch_handle_driver_event(channel, &event); + break; + case FSE_AZ_EV_CODE_GLOBAL_EV: + if (efx->type->handle_global_event && + efx->type->handle_global_event(channel, &event)) + break; + /* else fall through */ + default: + netif_err(channel->efx, hw, channel->efx->net_dev, + "channel %d unknown event type %d (data " + EF4_QWORD_FMT ")\n", channel->channel, + ev_code, EF4_QWORD_VAL(event)); + } + } + +out: + channel->eventq_read_ptr = read_ptr; + return spent; +} + +/* Allocate buffer table entries for event queue */ +int ef4_farch_ev_probe(struct ef4_channel *channel) +{ + struct ef4_nic *efx = channel->efx; + unsigned entries; + + entries = channel->eventq_mask + 1; + return ef4_alloc_special_buffer(efx, &channel->eventq, + entries * sizeof(ef4_qword_t)); +} + +int ef4_farch_ev_init(struct ef4_channel *channel) +{ + ef4_oword_t reg; + struct ef4_nic *efx = channel->efx; + + netif_dbg(efx, hw, efx->net_dev, + "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 */ + ef4_init_special_buffer(efx, &channel->eventq); + + /* Fill event queue with all ones (i.e. empty events) */ + memset(channel->eventq.buf.addr, 0xff, channel->eventq.buf.len); + + /* Push event queue to card */ + EF4_POPULATE_OWORD_3(reg, + FRF_AZ_EVQ_EN, 1, + FRF_AZ_EVQ_SIZE, __ffs(channel->eventq.entries), + FRF_AZ_EVQ_BUF_BASE_ID, channel->eventq.index); + ef4_writeo_table(efx, ®, efx->type->evq_ptr_tbl_base, + channel->channel); + + return 0; +} + +void ef4_farch_ev_fini(struct ef4_channel *channel) +{ + ef4_oword_t reg; + struct ef4_nic *efx = channel->efx; + + /* Remove event queue from card */ + EF4_ZERO_OWORD(reg); + ef4_writeo_table(efx, ®, efx->type->evq_ptr_tbl_base, + channel->channel); + + /* Unpin event queue */ + ef4_fini_special_buffer(efx, &channel->eventq); +} + +/* Free buffers backing event queue */ +void ef4_farch_ev_remove(struct ef4_channel *channel) +{ + ef4_free_special_buffer(channel->efx, &channel->eventq); +} + + +void ef4_farch_ev_test_generate(struct ef4_channel *channel) +{ + ef4_farch_magic_event(channel, EF4_CHANNEL_MAGIC_TEST(channel)); +} + +void ef4_farch_rx_defer_refill(struct ef4_rx_queue *rx_queue) +{ + ef4_farch_magic_event(ef4_rx_queue_channel(rx_queue), + EF4_CHANNEL_MAGIC_FILL(rx_queue)); +} + +/************************************************************************** + * + * 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 ef4_farch_interrupts(struct ef4_nic *efx, + bool enabled, bool force) +{ + ef4_oword_t int_en_reg_ker; + + EF4_POPULATE_OWORD_3(int_en_reg_ker, + FRF_AZ_KER_INT_LEVE_SEL, efx->irq_level, + FRF_AZ_KER_INT_KER, force, + FRF_AZ_DRV_INT_EN_KER, enabled); + ef4_writeo(efx, &int_en_reg_ker, FR_AZ_INT_EN_KER); +} + +void ef4_farch_irq_enable_master(struct ef4_nic *efx) +{ + EF4_ZERO_OWORD(*((ef4_oword_t *) efx->irq_status.addr)); + wmb(); /* Ensure interrupt vector is clear before interrupts enabled */ + + ef4_farch_interrupts(efx, true, false); +} + +void ef4_farch_irq_disable_master(struct ef4_nic *efx) +{ + /* Disable interrupts */ + ef4_farch_interrupts(efx, false, false); +} + +/* Generate a test interrupt + * Interrupt must already have been enabled, otherwise nasty things + * may happen. + */ +int ef4_farch_irq_test_generate(struct ef4_nic *efx) +{ + ef4_farch_interrupts(efx, true, true); + return 0; +} + +/* Process a fatal interrupt + * Disable bus mastering ASAP and schedule a reset + */ +irqreturn_t ef4_farch_fatal_interrupt(struct ef4_nic *efx) +{ + struct falcon_nic_data *nic_data = efx->nic_data; + ef4_oword_t *int_ker = efx->irq_status.addr; + ef4_oword_t fatal_intr; + int error, mem_perr; + + ef4_reado(efx, &fatal_intr, FR_AZ_FATAL_INTR_KER); + error = EF4_OWORD_FIELD(fatal_intr, FRF_AZ_FATAL_INTR); + + netif_err(efx, hw, efx->net_dev, "SYSTEM ERROR "EF4_OWORD_FMT" status " + EF4_OWORD_FMT ": %s\n", EF4_OWORD_VAL(*int_ker), + EF4_OWORD_VAL(fatal_intr), + error ? "disabling bus mastering" : "no recognised error"); + + /* If this is a memory parity error dump which blocks are offending */ + mem_perr = (EF4_OWORD_FIELD(fatal_intr, FRF_AZ_MEM_PERR_INT_KER) || + EF4_OWORD_FIELD(fatal_intr, FRF_AZ_SRM_PERR_INT_KER)); + if (mem_perr) { + ef4_oword_t reg; + ef4_reado(efx, ®, FR_AZ_MEM_STAT); + netif_err(efx, hw, efx->net_dev, + "SYSTEM ERROR: memory parity error "EF4_OWORD_FMT"\n", + EF4_OWORD_VAL(reg)); + } + + /* Disable both devices */ + pci_clear_master(efx->pci_dev); + if (ef4_nic_is_dual_func(efx)) + pci_clear_master(nic_data->pci_dev2); + ef4_farch_irq_disable_master(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 + EF4_INT_ERROR_EXPIRE * HZ; + } + if (++efx->int_error_count < EF4_MAX_INT_ERRORS) { + netif_err(efx, hw, efx->net_dev, + "SYSTEM ERROR - reset scheduled\n"); + ef4_schedule_reset(efx, RESET_TYPE_INT_ERROR); + } else { + netif_err(efx, hw, efx->net_dev, + "SYSTEM ERROR - max number of errors seen." + "NIC will be disabled\n"); + ef4_schedule_reset(efx, RESET_TYPE_DISABLE); + } + + return IRQ_HANDLED; +} + +/* Handle a legacy interrupt + * Acknowledges the interrupt and schedule event queue processing. + */ +irqreturn_t ef4_farch_legacy_interrupt(int irq, void *dev_id) +{ + struct ef4_nic *efx = dev_id; + bool soft_enabled = ACCESS_ONCE(efx->irq_soft_enabled); + ef4_oword_t *int_ker = efx->irq_status.addr; + irqreturn_t result = IRQ_NONE; + struct ef4_channel *channel; + ef4_dword_t reg; + u32 queues; + int syserr; + + /* Read the ISR which also ACKs the interrupts */ + ef4_readd(efx, ®, FR_BZ_INT_ISR0); + queues = EF4_EXTRACT_DWORD(reg, 0, 31); + + /* Legacy interrupts are disabled too late by the EEH kernel + * code. Disable them earlier. + * If an EEH error occurred, the read will have returned all ones. + */ + if (EF4_DWORD_IS_ALL_ONES(reg) && ef4_try_recovery(efx) && + !efx->eeh_disabled_legacy_irq) { + disable_irq_nosync(efx->legacy_irq); + efx->eeh_disabled_legacy_irq = true; + } + + /* Handle non-event-queue sources */ + if (queues & (1U << efx->irq_level) && soft_enabled) { + syserr = EF4_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT); + if (unlikely(syserr)) + return ef4_farch_fatal_interrupt(efx); + efx->last_irq_cpu = raw_smp_processor_id(); + } + + if (queues != 0) { + efx->irq_zero_count = 0; + + /* Schedule processing of any interrupting queues */ + if (likely(soft_enabled)) { + ef4_for_each_channel(channel, efx) { + if (queues & 1) + ef4_schedule_channel_irq(channel); + queues >>= 1; + } + } + result = IRQ_HANDLED; + + } else { + ef4_qword_t *event; + + /* Legacy ISR read can return zero once (SF bug 15783) */ + + /* We can't return IRQ_HANDLED more than once on seeing ISR=0 + * because this might be a shared interrupt. */ + if (efx->irq_zero_count++ == 0) + result = IRQ_HANDLED; + + /* Ensure we schedule or rearm all event queues */ + if (likely(soft_enabled)) { + ef4_for_each_channel(channel, efx) { + event = ef4_event(channel, + channel->eventq_read_ptr); + if (ef4_event_present(event)) + ef4_schedule_channel_irq(channel); + else + ef4_farch_ev_read_ack(channel); + } + } + } + + if (result == IRQ_HANDLED) + netif_vdbg(efx, intr, efx->net_dev, + "IRQ %d on CPU %d status " EF4_DWORD_FMT "\n", + irq, raw_smp_processor_id(), EF4_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. + */ +irqreturn_t ef4_farch_msi_interrupt(int irq, void *dev_id) +{ + struct ef4_msi_context *context = dev_id; + struct ef4_nic *efx = context->efx; + ef4_oword_t *int_ker = efx->irq_status.addr; + int syserr; + + netif_vdbg(efx, intr, efx->net_dev, + "IRQ %d on CPU %d status " EF4_OWORD_FMT "\n", + irq, raw_smp_processor_id(), EF4_OWORD_VAL(*int_ker)); + + if (!likely(ACCESS_ONCE(efx->irq_soft_enabled))) + return IRQ_HANDLED; + + /* Handle non-event-queue sources */ + if (context->index == efx->irq_level) { + syserr = EF4_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT); + if (unlikely(syserr)) + return ef4_farch_fatal_interrupt(efx); + efx->last_irq_cpu = raw_smp_processor_id(); + } + + /* Schedule processing of the channel */ + ef4_schedule_channel_irq(efx->channel[context->index]); + + return IRQ_HANDLED; +} + +/* Setup RSS indirection table. + * This maps from the hash value of the packet to RXQ + */ +void ef4_farch_rx_push_indir_table(struct ef4_nic *efx) +{ + size_t i = 0; + ef4_dword_t dword; + + BUG_ON(ef4_nic_rev(efx) < EF4_REV_FALCON_B0); + + BUILD_BUG_ON(ARRAY_SIZE(efx->rx_indir_table) != + FR_BZ_RX_INDIRECTION_TBL_ROWS); + + for (i = 0; i < FR_BZ_RX_INDIRECTION_TBL_ROWS; i++) { + EF4_POPULATE_DWORD_1(dword, FRF_BZ_IT_QUEUE, + efx->rx_indir_table[i]); + ef4_writed(efx, &dword, + FR_BZ_RX_INDIRECTION_TBL + + FR_BZ_RX_INDIRECTION_TBL_STEP * i); + } +} + +/* Looks at available SRAM resources and works out how many queues we + * can support, and where things like descriptor caches should live. + * + * SRAM is split up as follows: + * 0 buftbl entries for channels + * efx->vf_buftbl_base buftbl entries for SR-IOV + * efx->rx_dc_base RX descriptor caches + * efx->tx_dc_base TX descriptor caches + */ +void ef4_farch_dimension_resources(struct ef4_nic *efx, unsigned sram_lim_qw) +{ + unsigned vi_count, buftbl_min; + + /* Account for the buffer table entries backing the datapath channels + * and the descriptor caches for those channels. + */ + buftbl_min = ((efx->n_rx_channels * EF4_MAX_DMAQ_SIZE + + efx->n_tx_channels * EF4_TXQ_TYPES * EF4_MAX_DMAQ_SIZE + + efx->n_channels * EF4_MAX_EVQ_SIZE) + * sizeof(ef4_qword_t) / EF4_BUF_SIZE); + vi_count = max(efx->n_channels, efx->n_tx_channels * EF4_TXQ_TYPES); + + efx->tx_dc_base = sram_lim_qw - vi_count * TX_DC_ENTRIES; + efx->rx_dc_base = efx->tx_dc_base - vi_count * RX_DC_ENTRIES; +} + +u32 ef4_farch_fpga_ver(struct ef4_nic *efx) +{ + ef4_oword_t altera_build; + ef4_reado(efx, &altera_build, FR_AZ_ALTERA_BUILD); + return EF4_OWORD_FIELD(altera_build, FRF_AZ_ALTERA_BUILD_VER); +} + +void ef4_farch_init_common(struct ef4_nic *efx) +{ + ef4_oword_t temp; + + /* Set positions of descriptor caches in SRAM. */ + EF4_POPULATE_OWORD_1(temp, FRF_AZ_SRM_TX_DC_BASE_ADR, efx->tx_dc_base); + ef4_writeo(efx, &temp, FR_AZ_SRM_TX_DC_CFG); + EF4_POPULATE_OWORD_1(temp, FRF_AZ_SRM_RX_DC_BASE_ADR, efx->rx_dc_base); + ef4_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)); + EF4_POPULATE_OWORD_1(temp, FRF_AZ_TX_DC_SIZE, TX_DC_ENTRIES_ORDER); + ef4_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)); + EF4_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_SIZE, RX_DC_ENTRIES_ORDER); + ef4_writeo(efx, &temp, FR_AZ_RX_DC_CFG); + EF4_POPULATE_OWORD_1(temp, FRF_AZ_RX_DC_PF_LWM, RX_DC_ENTRIES - 8); + ef4_writeo(efx, &temp, FR_AZ_RX_DC_PF_WM); + + /* Program INT_KER address */ + EF4_POPULATE_OWORD_2(temp, + FRF_AZ_NORM_INT_VEC_DIS_KER, + EF4_INT_MODE_USE_MSI(efx), + FRF_AZ_INT_ADR_KER, efx->irq_status.dma_addr); + ef4_writeo(efx, &temp, FR_AZ_INT_ADR_KER); + + /* Use a valid MSI-X vector */ + efx->irq_level = 0; + + /* 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 + */ + EF4_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); + EF4_INVERT_OWORD(temp); + ef4_writeo(efx, &temp, FR_AZ_FATAL_INTR_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. + */ + ef4_reado(efx, &temp, FR_AZ_TX_RESERVED); + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER, 0xfe); + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_RX_SPACER_EN, 1); + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_ONE_PKT_PER_Q, 1); + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PUSH_EN, 1); + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_DIS_NON_IP_EV, 1); + /* Enable SW_EV to inherit in char driver - assume harmless here */ + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_SOFT_EVT_EN, 1); + /* Prefetch threshold 2 => fetch when descriptor cache half empty */ + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_THRESHOLD, 2); + /* Disable hardware watchdog which can misfire */ + EF4_SET_OWORD_FIELD(temp, FRF_AZ_TX_PREF_WD_TMR, 0x3fffff); + /* Squash TX of packets of 16 bytes or less */ + if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) + EF4_SET_OWORD_FIELD(temp, FRF_BZ_TX_FLUSH_MIN_LEN_EN, 1); + ef4_writeo(efx, &temp, FR_AZ_TX_RESERVED); + + if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) { + EF4_POPULATE_OWORD_4(temp, + /* Default values */ + FRF_BZ_TX_PACE_SB_NOT_AF, 0x15, + FRF_BZ_TX_PACE_SB_AF, 0xb, + FRF_BZ_TX_PACE_FB_BASE, 0, + /* Allow large pace values in the + * fast bin. */ + FRF_BZ_TX_PACE_BIN_TH, + FFE_BZ_TX_PACE_RESERVED); + ef4_writeo(efx, &temp, FR_BZ_TX_PACE); + } +} + +/************************************************************************** + * + * Filter tables + * + ************************************************************************** + */ + +/* "Fudge factors" - difference between programmed value and actual depth. + * Due to pipelined implementation we need to program H/W with a value that + * is larger than the hop limit we want. + */ +#define EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD 3 +#define EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL 1 + +/* Hard maximum search limit. Hardware will time-out beyond 200-something. + * We also need to avoid infinite loops in ef4_farch_filter_search() when the + * table is full. + */ +#define EF4_FARCH_FILTER_CTL_SRCH_MAX 200 + +/* Don't try very hard to find space for performance hints, as this is + * counter-productive. */ +#define EF4_FARCH_FILTER_CTL_SRCH_HINT_MAX 5 + +enum ef4_farch_filter_type { + EF4_FARCH_FILTER_TCP_FULL = 0, + EF4_FARCH_FILTER_TCP_WILD, + EF4_FARCH_FILTER_UDP_FULL, + EF4_FARCH_FILTER_UDP_WILD, + EF4_FARCH_FILTER_MAC_FULL = 4, + EF4_FARCH_FILTER_MAC_WILD, + EF4_FARCH_FILTER_UC_DEF = 8, + EF4_FARCH_FILTER_MC_DEF, + EF4_FARCH_FILTER_TYPE_COUNT, /* number of specific types */ +}; + +enum ef4_farch_filter_table_id { + EF4_FARCH_FILTER_TABLE_RX_IP = 0, + EF4_FARCH_FILTER_TABLE_RX_MAC, + EF4_FARCH_FILTER_TABLE_RX_DEF, + EF4_FARCH_FILTER_TABLE_TX_MAC, + EF4_FARCH_FILTER_TABLE_COUNT, +}; + +enum ef4_farch_filter_index { + EF4_FARCH_FILTER_INDEX_UC_DEF, + EF4_FARCH_FILTER_INDEX_MC_DEF, + EF4_FARCH_FILTER_SIZE_RX_DEF, +}; + +struct ef4_farch_filter_spec { + u8 type:4; + u8 priority:4; + u8 flags; + u16 dmaq_id; + u32 data[3]; +}; + +struct ef4_farch_filter_table { + enum ef4_farch_filter_table_id id; + u32 offset; /* address of table relative to BAR */ + unsigned size; /* number of entries */ + unsigned step; /* step between entries */ + unsigned used; /* number currently used */ + unsigned long *used_bitmap; + struct ef4_farch_filter_spec *spec; + unsigned search_limit[EF4_FARCH_FILTER_TYPE_COUNT]; +}; + +struct ef4_farch_filter_state { + struct ef4_farch_filter_table table[EF4_FARCH_FILTER_TABLE_COUNT]; +}; + +static void +ef4_farch_filter_table_clear_entry(struct ef4_nic *efx, + struct ef4_farch_filter_table *table, + unsigned int filter_idx); + +/* The filter hash function is LFSR polynomial x^16 + x^3 + 1 of a 32-bit + * key derived from the n-tuple. The initial LFSR state is 0xffff. */ +static u16 ef4_farch_filter_hash(u32 key) +{ + u16 tmp; + + /* First 16 rounds */ + tmp = 0x1fff ^ key >> 16; + tmp = tmp ^ tmp >> 3 ^ tmp >> 6; + tmp = tmp ^ tmp >> 9; + /* Last 16 rounds */ + tmp = tmp ^ tmp << 13 ^ key; + tmp = tmp ^ tmp >> 3 ^ tmp >> 6; + return tmp ^ tmp >> 9; +} + +/* To allow for hash collisions, filter search continues at these + * increments from the first possible entry selected by the hash. */ +static u16 ef4_farch_filter_increment(u32 key) +{ + return key * 2 - 1; +} + +static enum ef4_farch_filter_table_id +ef4_farch_filter_spec_table_id(const struct ef4_farch_filter_spec *spec) +{ + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP != + (EF4_FARCH_FILTER_TCP_FULL >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP != + (EF4_FARCH_FILTER_TCP_WILD >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP != + (EF4_FARCH_FILTER_UDP_FULL >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_IP != + (EF4_FARCH_FILTER_UDP_WILD >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_MAC != + (EF4_FARCH_FILTER_MAC_FULL >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_RX_MAC != + (EF4_FARCH_FILTER_MAC_WILD >> 2)); + BUILD_BUG_ON(EF4_FARCH_FILTER_TABLE_TX_MAC != + EF4_FARCH_FILTER_TABLE_RX_MAC + 2); + return (spec->type >> 2) + ((spec->flags & EF4_FILTER_FLAG_TX) ? 2 : 0); +} + +static void ef4_farch_filter_push_rx_config(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + struct ef4_farch_filter_table *table; + ef4_oword_t filter_ctl; + + ef4_reado(efx, &filter_ctl, FR_BZ_RX_FILTER_CTL); + + table = &state->table[EF4_FARCH_FILTER_TABLE_RX_IP]; + EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_FULL_SRCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_TCP_FULL] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL); + EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_TCP_WILD_SRCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_TCP_WILD] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD); + EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_FULL_SRCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_UDP_FULL] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL); + EF4_SET_OWORD_FIELD(filter_ctl, FRF_BZ_UDP_WILD_SRCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_UDP_WILD] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD); + + table = &state->table[EF4_FARCH_FILTER_TABLE_RX_MAC]; + if (table->size) { + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_ETHERNET_FULL_SEARCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_MAC_FULL] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL); + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_ETHERNET_WILDCARD_SEARCH_LIMIT, + table->search_limit[EF4_FARCH_FILTER_MAC_WILD] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD); + } + + table = &state->table[EF4_FARCH_FILTER_TABLE_RX_DEF]; + if (table->size) { + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_UNICAST_NOMATCH_Q_ID, + table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].dmaq_id); + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_UNICAST_NOMATCH_RSS_ENABLED, + !!(table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].flags & + EF4_FILTER_FLAG_RX_RSS)); + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_MULTICAST_NOMATCH_Q_ID, + table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].dmaq_id); + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_CZ_MULTICAST_NOMATCH_RSS_ENABLED, + !!(table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].flags & + EF4_FILTER_FLAG_RX_RSS)); + + /* There is a single bit to enable RX scatter for all + * unmatched packets. Only set it if scatter is + * enabled in both filter specs. + */ + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_BZ_SCATTER_ENBL_NO_MATCH_Q, + !!(table->spec[EF4_FARCH_FILTER_INDEX_UC_DEF].flags & + table->spec[EF4_FARCH_FILTER_INDEX_MC_DEF].flags & + EF4_FILTER_FLAG_RX_SCATTER)); + } else if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) { + /* We don't expose 'default' filters because unmatched + * packets always go to the queue number found in the + * RSS table. But we still need to set the RX scatter + * bit here. + */ + EF4_SET_OWORD_FIELD( + filter_ctl, FRF_BZ_SCATTER_ENBL_NO_MATCH_Q, + efx->rx_scatter); + } + + ef4_writeo(efx, &filter_ctl, FR_BZ_RX_FILTER_CTL); +} + +static void ef4_farch_filter_push_tx_limits(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + struct ef4_farch_filter_table *table; + ef4_oword_t tx_cfg; + + ef4_reado(efx, &tx_cfg, FR_AZ_TX_CFG); + + table = &state->table[EF4_FARCH_FILTER_TABLE_TX_MAC]; + if (table->size) { + EF4_SET_OWORD_FIELD( + tx_cfg, FRF_CZ_TX_ETH_FILTER_FULL_SEARCH_RANGE, + table->search_limit[EF4_FARCH_FILTER_MAC_FULL] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_FULL); + EF4_SET_OWORD_FIELD( + tx_cfg, FRF_CZ_TX_ETH_FILTER_WILD_SEARCH_RANGE, + table->search_limit[EF4_FARCH_FILTER_MAC_WILD] + + EF4_FARCH_FILTER_CTL_SRCH_FUDGE_WILD); + } + + ef4_writeo(efx, &tx_cfg, FR_AZ_TX_CFG); +} + +static int +ef4_farch_filter_from_gen_spec(struct ef4_farch_filter_spec *spec, + const struct ef4_filter_spec *gen_spec) +{ + bool is_full = false; + + if ((gen_spec->flags & EF4_FILTER_FLAG_RX_RSS) && + gen_spec->rss_context != EF4_FILTER_RSS_CONTEXT_DEFAULT) + return -EINVAL; + + spec->priority = gen_spec->priority; + spec->flags = gen_spec->flags; + spec->dmaq_id = gen_spec->dmaq_id; + + switch (gen_spec->match_flags) { + case (EF4_FILTER_MATCH_ETHER_TYPE | EF4_FILTER_MATCH_IP_PROTO | + EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT | + EF4_FILTER_MATCH_REM_HOST | EF4_FILTER_MATCH_REM_PORT): + is_full = true; + /* fall through */ + case (EF4_FILTER_MATCH_ETHER_TYPE | EF4_FILTER_MATCH_IP_PROTO | + EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT): { + __be32 rhost, host1, host2; + __be16 rport, port1, port2; + + EF4_BUG_ON_PARANOID(!(gen_spec->flags & EF4_FILTER_FLAG_RX)); + + if (gen_spec->ether_type != htons(ETH_P_IP)) + return -EPROTONOSUPPORT; + if (gen_spec->loc_port == 0 || + (is_full && gen_spec->rem_port == 0)) + return -EADDRNOTAVAIL; + switch (gen_spec->ip_proto) { + case IPPROTO_TCP: + spec->type = (is_full ? EF4_FARCH_FILTER_TCP_FULL : + EF4_FARCH_FILTER_TCP_WILD); + break; + case IPPROTO_UDP: + spec->type = (is_full ? EF4_FARCH_FILTER_UDP_FULL : + EF4_FARCH_FILTER_UDP_WILD); + break; + default: + return -EPROTONOSUPPORT; + } + + /* Filter is constructed in terms of source and destination, + * with the odd wrinkle that the ports are swapped in a UDP + * wildcard filter. We need to convert from local and remote + * (= zero for wildcard) addresses. + */ + rhost = is_full ? gen_spec->rem_host[0] : 0; + rport = is_full ? gen_spec->rem_port : 0; + host1 = rhost; + host2 = gen_spec->loc_host[0]; + if (!is_full && gen_spec->ip_proto == IPPROTO_UDP) { + port1 = gen_spec->loc_port; + port2 = rport; + } else { + port1 = rport; + port2 = gen_spec->loc_port; + } + spec->data[0] = ntohl(host1) << 16 | ntohs(port1); + spec->data[1] = ntohs(port2) << 16 | ntohl(host1) >> 16; + spec->data[2] = ntohl(host2); + + break; + } + + case EF4_FILTER_MATCH_LOC_MAC | EF4_FILTER_MATCH_OUTER_VID: + is_full = true; + /* fall through */ + case EF4_FILTER_MATCH_LOC_MAC: + spec->type = (is_full ? EF4_FARCH_FILTER_MAC_FULL : + EF4_FARCH_FILTER_MAC_WILD); + spec->data[0] = is_full ? ntohs(gen_spec->outer_vid) : 0; + spec->data[1] = (gen_spec->loc_mac[2] << 24 | + gen_spec->loc_mac[3] << 16 | + gen_spec->loc_mac[4] << 8 | + gen_spec->loc_mac[5]); + spec->data[2] = (gen_spec->loc_mac[0] << 8 | + gen_spec->loc_mac[1]); + break; + + case EF4_FILTER_MATCH_LOC_MAC_IG: + spec->type = (is_multicast_ether_addr(gen_spec->loc_mac) ? + EF4_FARCH_FILTER_MC_DEF : + EF4_FARCH_FILTER_UC_DEF); + memset(spec->data, 0, sizeof(spec->data)); /* ensure equality */ + break; + + default: + return -EPROTONOSUPPORT; + } + + return 0; +} + +static void +ef4_farch_filter_to_gen_spec(struct ef4_filter_spec *gen_spec, + const struct ef4_farch_filter_spec *spec) +{ + bool is_full = false; + + /* *gen_spec should be completely initialised, to be consistent + * with ef4_filter_init_{rx,tx}() and in case we want to copy + * it back to userland. + */ + memset(gen_spec, 0, sizeof(*gen_spec)); + + gen_spec->priority = spec->priority; + gen_spec->flags = spec->flags; + gen_spec->dmaq_id = spec->dmaq_id; + + switch (spec->type) { + case EF4_FARCH_FILTER_TCP_FULL: + case EF4_FARCH_FILTER_UDP_FULL: + is_full = true; + /* fall through */ + case EF4_FARCH_FILTER_TCP_WILD: + case EF4_FARCH_FILTER_UDP_WILD: { + __be32 host1, host2; + __be16 port1, port2; + + gen_spec->match_flags = + EF4_FILTER_MATCH_ETHER_TYPE | + EF4_FILTER_MATCH_IP_PROTO | + EF4_FILTER_MATCH_LOC_HOST | EF4_FILTER_MATCH_LOC_PORT; + if (is_full) + gen_spec->match_flags |= (EF4_FILTER_MATCH_REM_HOST | + EF4_FILTER_MATCH_REM_PORT); + gen_spec->ether_type = htons(ETH_P_IP); + gen_spec->ip_proto = + (spec->type == EF4_FARCH_FILTER_TCP_FULL || + spec->type == EF4_FARCH_FILTER_TCP_WILD) ? + IPPROTO_TCP : IPPROTO_UDP; + + host1 = htonl(spec->data[0] >> 16 | spec->data[1] << 16); + port1 = htons(spec->data[0]); + host2 = htonl(spec->data[2]); + port2 = htons(spec->data[1] >> 16); + if (spec->flags & EF4_FILTER_FLAG_TX) { + gen_spec->loc_host[0] = host1; + gen_spec->rem_host[0] = host2; + } else { + gen_spec->loc_host[0] = host2; + gen_spec->rem_host[0] = host1; + } + if (!!(gen_spec->flags & EF4_FILTER_FLAG_TX) ^ + (!is_full && gen_spec->ip_proto == IPPROTO_UDP)) { + gen_spec->loc_port = port1; + gen_spec->rem_port = port2; + } else { + gen_spec->loc_port = port2; + gen_spec->rem_port = port1; + } + + break; + } + + case EF4_FARCH_FILTER_MAC_FULL: + is_full = true; + /* fall through */ + case EF4_FARCH_FILTER_MAC_WILD: + gen_spec->match_flags = EF4_FILTER_MATCH_LOC_MAC; + if (is_full) + gen_spec->match_flags |= EF4_FILTER_MATCH_OUTER_VID; + gen_spec->loc_mac[0] = spec->data[2] >> 8; + gen_spec->loc_mac[1] = spec->data[2]; + gen_spec->loc_mac[2] = spec->data[1] >> 24; + gen_spec->loc_mac[3] = spec->data[1] >> 16; + gen_spec->loc_mac[4] = spec->data[1] >> 8; + gen_spec->loc_mac[5] = spec->data[1]; + gen_spec->outer_vid = htons(spec->data[0]); + break; + + case EF4_FARCH_FILTER_UC_DEF: + case EF4_FARCH_FILTER_MC_DEF: + gen_spec->match_flags = EF4_FILTER_MATCH_LOC_MAC_IG; + gen_spec->loc_mac[0] = spec->type == EF4_FARCH_FILTER_MC_DEF; + break; + + default: + WARN_ON(1); + break; + } +} + +static void +ef4_farch_filter_init_rx_auto(struct ef4_nic *efx, + struct ef4_farch_filter_spec *spec) +{ + /* If there's only one channel then disable RSS for non VF + * traffic, thereby allowing VFs to use RSS when the PF can't. + */ + spec->priority = EF4_FILTER_PRI_AUTO; + spec->flags = (EF4_FILTER_FLAG_RX | + (ef4_rss_enabled(efx) ? EF4_FILTER_FLAG_RX_RSS : 0) | + (efx->rx_scatter ? EF4_FILTER_FLAG_RX_SCATTER : 0)); + spec->dmaq_id = 0; +} + +/* Build a filter entry and return its n-tuple key. */ +static u32 ef4_farch_filter_build(ef4_oword_t *filter, + struct ef4_farch_filter_spec *spec) +{ + u32 data3; + + switch (ef4_farch_filter_spec_table_id(spec)) { + case EF4_FARCH_FILTER_TABLE_RX_IP: { + bool is_udp = (spec->type == EF4_FARCH_FILTER_UDP_FULL || + spec->type == EF4_FARCH_FILTER_UDP_WILD); + EF4_POPULATE_OWORD_7( + *filter, + FRF_BZ_RSS_EN, + !!(spec->flags & EF4_FILTER_FLAG_RX_RSS), + FRF_BZ_SCATTER_EN, + !!(spec->flags & EF4_FILTER_FLAG_RX_SCATTER), + FRF_BZ_TCP_UDP, is_udp, + FRF_BZ_RXQ_ID, spec->dmaq_id, + EF4_DWORD_2, spec->data[2], + EF4_DWORD_1, spec->data[1], + EF4_DWORD_0, spec->data[0]); + data3 = is_udp; + break; + } + + case EF4_FARCH_FILTER_TABLE_RX_MAC: { + bool is_wild = spec->type == EF4_FARCH_FILTER_MAC_WILD; + EF4_POPULATE_OWORD_7( + *filter, + FRF_CZ_RMFT_RSS_EN, + !!(spec->flags & EF4_FILTER_FLAG_RX_RSS), + FRF_CZ_RMFT_SCATTER_EN, + !!(spec->flags & EF4_FILTER_FLAG_RX_SCATTER), + FRF_CZ_RMFT_RXQ_ID, spec->dmaq_id, + FRF_CZ_RMFT_WILDCARD_MATCH, is_wild, + FRF_CZ_RMFT_DEST_MAC_HI, spec->data[2], + FRF_CZ_RMFT_DEST_MAC_LO, spec->data[1], + FRF_CZ_RMFT_VLAN_ID, spec->data[0]); + data3 = is_wild; + break; + } + + case EF4_FARCH_FILTER_TABLE_TX_MAC: { + bool is_wild = spec->type == EF4_FARCH_FILTER_MAC_WILD; + EF4_POPULATE_OWORD_5(*filter, + FRF_CZ_TMFT_TXQ_ID, spec->dmaq_id, + FRF_CZ_TMFT_WILDCARD_MATCH, is_wild, + FRF_CZ_TMFT_SRC_MAC_HI, spec->data[2], + FRF_CZ_TMFT_SRC_MAC_LO, spec->data[1], + FRF_CZ_TMFT_VLAN_ID, spec->data[0]); + data3 = is_wild | spec->dmaq_id << 1; + break; + } + + default: + BUG(); + } + + return spec->data[0] ^ spec->data[1] ^ spec->data[2] ^ data3; +} + +static bool ef4_farch_filter_equal(const struct ef4_farch_filter_spec *left, + const struct ef4_farch_filter_spec *right) +{ + if (left->type != right->type || + memcmp(left->data, right->data, sizeof(left->data))) + return false; + + if (left->flags & EF4_FILTER_FLAG_TX && + left->dmaq_id != right->dmaq_id) + return false; + + return true; +} + +/* + * Construct/deconstruct external filter IDs. At least the RX filter + * IDs must be ordered by matching priority, for RX NFC semantics. + * + * Deconstruction needs to be robust against invalid IDs so that + * ef4_filter_remove_id_safe() and ef4_filter_get_filter_safe() can + * accept user-provided IDs. + */ + +#define EF4_FARCH_FILTER_MATCH_PRI_COUNT 5 + +static const u8 ef4_farch_filter_type_match_pri[EF4_FARCH_FILTER_TYPE_COUNT] = { + [EF4_FARCH_FILTER_TCP_FULL] = 0, + [EF4_FARCH_FILTER_UDP_FULL] = 0, + [EF4_FARCH_FILTER_TCP_WILD] = 1, + [EF4_FARCH_FILTER_UDP_WILD] = 1, + [EF4_FARCH_FILTER_MAC_FULL] = 2, + [EF4_FARCH_FILTER_MAC_WILD] = 3, + [EF4_FARCH_FILTER_UC_DEF] = 4, + [EF4_FARCH_FILTER_MC_DEF] = 4, +}; + +static const enum ef4_farch_filter_table_id ef4_farch_filter_range_table[] = { + EF4_FARCH_FILTER_TABLE_RX_IP, /* RX match pri 0 */ + EF4_FARCH_FILTER_TABLE_RX_IP, + EF4_FARCH_FILTER_TABLE_RX_MAC, + EF4_FARCH_FILTER_TABLE_RX_MAC, + EF4_FARCH_FILTER_TABLE_RX_DEF, /* RX match pri 4 */ + EF4_FARCH_FILTER_TABLE_TX_MAC, /* TX match pri 0 */ + EF4_FARCH_FILTER_TABLE_TX_MAC, /* TX match pri 1 */ +}; + +#define EF4_FARCH_FILTER_INDEX_WIDTH 13 +#define EF4_FARCH_FILTER_INDEX_MASK ((1 << EF4_FARCH_FILTER_INDEX_WIDTH) - 1) + +static inline u32 +ef4_farch_filter_make_id(const struct ef4_farch_filter_spec *spec, + unsigned int index) +{ + unsigned int range; + + range = ef4_farch_filter_type_match_pri[spec->type]; + if (!(spec->flags & EF4_FILTER_FLAG_RX)) + range += EF4_FARCH_FILTER_MATCH_PRI_COUNT; + + return range << EF4_FARCH_FILTER_INDEX_WIDTH | index; +} + +static inline enum ef4_farch_filter_table_id +ef4_farch_filter_id_table_id(u32 id) +{ + unsigned int range = id >> EF4_FARCH_FILTER_INDEX_WIDTH; + + if (range < ARRAY_SIZE(ef4_farch_filter_range_table)) + return ef4_farch_filter_range_table[range]; + else + return EF4_FARCH_FILTER_TABLE_COUNT; /* invalid */ +} + +static inline unsigned int ef4_farch_filter_id_index(u32 id) +{ + return id & EF4_FARCH_FILTER_INDEX_MASK; +} + +u32 ef4_farch_filter_get_rx_id_limit(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + unsigned int range = EF4_FARCH_FILTER_MATCH_PRI_COUNT - 1; + enum ef4_farch_filter_table_id table_id; + + do { + table_id = ef4_farch_filter_range_table[range]; + if (state->table[table_id].size != 0) + return range << EF4_FARCH_FILTER_INDEX_WIDTH | + state->table[table_id].size; + } while (range--); + + return 0; +} + +s32 ef4_farch_filter_insert(struct ef4_nic *efx, + struct ef4_filter_spec *gen_spec, + bool replace_equal) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + struct ef4_farch_filter_table *table; + struct ef4_farch_filter_spec spec; + ef4_oword_t filter; + int rep_index, ins_index; + unsigned int depth = 0; + int rc; + + rc = ef4_farch_filter_from_gen_spec(&spec, gen_spec); + if (rc) + return rc; + + table = &state->table[ef4_farch_filter_spec_table_id(&spec)]; + if (table->size == 0) + return -EINVAL; + + netif_vdbg(efx, hw, efx->net_dev, + "%s: type %d search_limit=%d", __func__, spec.type, + table->search_limit[spec.type]); + + if (table->id == EF4_FARCH_FILTER_TABLE_RX_DEF) { + /* One filter spec per type */ + BUILD_BUG_ON(EF4_FARCH_FILTER_INDEX_UC_DEF != 0); + BUILD_BUG_ON(EF4_FARCH_FILTER_INDEX_MC_DEF != + EF4_FARCH_FILTER_MC_DEF - EF4_FARCH_FILTER_UC_DEF); + rep_index = spec.type - EF4_FARCH_FILTER_UC_DEF; + ins_index = rep_index; + + spin_lock_bh(&efx->filter_lock); + } else { + /* Search concurrently for + * (1) a filter to be replaced (rep_index): any filter + * with the same match values, up to the current + * search depth for this type, and + * (2) the insertion point (ins_index): (1) or any + * free slot before it or up to the maximum search + * depth for this priority + * We fail if we cannot find (2). + * + * We can stop once either + * (a) we find (1), in which case we have definitely + * found (2) as well; or + * (b) we have searched exhaustively for (1), and have + * either found (2) or searched exhaustively for it + */ + u32 key = ef4_farch_filter_build(&filter, &spec); + unsigned int hash = ef4_farch_filter_hash(key); + unsigned int incr = ef4_farch_filter_increment(key); + unsigned int max_rep_depth = table->search_limit[spec.type]; + unsigned int max_ins_depth = + spec.priority <= EF4_FILTER_PRI_HINT ? + EF4_FARCH_FILTER_CTL_SRCH_HINT_MAX : + EF4_FARCH_FILTER_CTL_SRCH_MAX; + unsigned int i = hash & (table->size - 1); + + ins_index = -1; + depth = 1; + + spin_lock_bh(&efx->filter_lock); + + for (;;) { + if (!test_bit(i, table->used_bitmap)) { + if (ins_index < 0) + ins_index = i; + } else if (ef4_farch_filter_equal(&spec, + &table->spec[i])) { + /* Case (a) */ + if (ins_index < 0) + ins_index = i; + rep_index = i; + break; + } + + if (depth >= max_rep_depth && + (ins_index >= 0 || depth >= max_ins_depth)) { + /* Case (b) */ + if (ins_index < 0) { + rc = -EBUSY; + goto out; + } + rep_index = -1; + break; + } + + i = (i + incr) & (table->size - 1); + ++depth; + } + } + + /* If we found a filter to be replaced, check whether we + * should do so + */ + if (rep_index >= 0) { + struct ef4_farch_filter_spec *saved_spec = + &table->spec[rep_index]; + + if (spec.priority == saved_spec->priority && !replace_equal) { + rc = -EEXIST; + goto out; + } + if (spec.priority < saved_spec->priority) { + rc = -EPERM; + goto out; + } + if (saved_spec->priority == EF4_FILTER_PRI_AUTO || + saved_spec->flags & EF4_FILTER_FLAG_RX_OVER_AUTO) + spec.flags |= EF4_FILTER_FLAG_RX_OVER_AUTO; + } + + /* Insert the filter */ + if (ins_index != rep_index) { + __set_bit(ins_index, table->used_bitmap); + ++table->used; + } + table->spec[ins_index] = spec; + + if (table->id == EF4_FARCH_FILTER_TABLE_RX_DEF) { + ef4_farch_filter_push_rx_config(efx); + } else { + if (table->search_limit[spec.type] < depth) { + table->search_limit[spec.type] = depth; + if (spec.flags & EF4_FILTER_FLAG_TX) + ef4_farch_filter_push_tx_limits(efx); + else + ef4_farch_filter_push_rx_config(efx); + } + + ef4_writeo(efx, &filter, + table->offset + table->step * ins_index); + + /* If we were able to replace a filter by inserting + * at a lower depth, clear the replaced filter + */ + if (ins_index != rep_index && rep_index >= 0) + ef4_farch_filter_table_clear_entry(efx, table, + rep_index); + } + + netif_vdbg(efx, hw, efx->net_dev, + "%s: filter type %d index %d rxq %u set", + __func__, spec.type, ins_index, spec.dmaq_id); + rc = ef4_farch_filter_make_id(&spec, ins_index); + +out: + spin_unlock_bh(&efx->filter_lock); + return rc; +} + +static void +ef4_farch_filter_table_clear_entry(struct ef4_nic *efx, + struct ef4_farch_filter_table *table, + unsigned int filter_idx) +{ + static ef4_oword_t filter; + + EF4_WARN_ON_PARANOID(!test_bit(filter_idx, table->used_bitmap)); + BUG_ON(table->offset == 0); /* can't clear MAC default filters */ + + __clear_bit(filter_idx, table->used_bitmap); + --table->used; + memset(&table->spec[filter_idx], 0, sizeof(table->spec[0])); + + ef4_writeo(efx, &filter, table->offset + table->step * filter_idx); + + /* If this filter required a greater search depth than + * any other, the search limit for its type can now be + * decreased. However, it is hard to determine that + * unless the table has become completely empty - in + * which case, all its search limits can be set to 0. + */ + if (unlikely(table->used == 0)) { + memset(table->search_limit, 0, sizeof(table->search_limit)); + if (table->id == EF4_FARCH_FILTER_TABLE_TX_MAC) + ef4_farch_filter_push_tx_limits(efx); + else + ef4_farch_filter_push_rx_config(efx); + } +} + +static int ef4_farch_filter_remove(struct ef4_nic *efx, + struct ef4_farch_filter_table *table, + unsigned int filter_idx, + enum ef4_filter_priority priority) +{ + struct ef4_farch_filter_spec *spec = &table->spec[filter_idx]; + + if (!test_bit(filter_idx, table->used_bitmap) || + spec->priority != priority) + return -ENOENT; + + if (spec->flags & EF4_FILTER_FLAG_RX_OVER_AUTO) { + ef4_farch_filter_init_rx_auto(efx, spec); + ef4_farch_filter_push_rx_config(efx); + } else { + ef4_farch_filter_table_clear_entry(efx, table, filter_idx); + } + + return 0; +} + +int ef4_farch_filter_remove_safe(struct ef4_nic *efx, + enum ef4_filter_priority priority, + u32 filter_id) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + unsigned int filter_idx; + struct ef4_farch_filter_spec *spec; + int rc; + + table_id = ef4_farch_filter_id_table_id(filter_id); + if ((unsigned int)table_id >= EF4_FARCH_FILTER_TABLE_COUNT) + return -ENOENT; + table = &state->table[table_id]; + + filter_idx = ef4_farch_filter_id_index(filter_id); + if (filter_idx >= table->size) + return -ENOENT; + spec = &table->spec[filter_idx]; + + spin_lock_bh(&efx->filter_lock); + rc = ef4_farch_filter_remove(efx, table, filter_idx, priority); + spin_unlock_bh(&efx->filter_lock); + + return rc; +} + +int ef4_farch_filter_get_safe(struct ef4_nic *efx, + enum ef4_filter_priority priority, + u32 filter_id, struct ef4_filter_spec *spec_buf) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + struct ef4_farch_filter_spec *spec; + unsigned int filter_idx; + int rc; + + table_id = ef4_farch_filter_id_table_id(filter_id); + if ((unsigned int)table_id >= EF4_FARCH_FILTER_TABLE_COUNT) + return -ENOENT; + table = &state->table[table_id]; + + filter_idx = ef4_farch_filter_id_index(filter_id); + if (filter_idx >= table->size) + return -ENOENT; + spec = &table->spec[filter_idx]; + + spin_lock_bh(&efx->filter_lock); + + if (test_bit(filter_idx, table->used_bitmap) && + spec->priority == priority) { + ef4_farch_filter_to_gen_spec(spec_buf, spec); + rc = 0; + } else { + rc = -ENOENT; + } + + spin_unlock_bh(&efx->filter_lock); + + return rc; +} + +static void +ef4_farch_filter_table_clear(struct ef4_nic *efx, + enum ef4_farch_filter_table_id table_id, + enum ef4_filter_priority priority) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + struct ef4_farch_filter_table *table = &state->table[table_id]; + unsigned int filter_idx; + + spin_lock_bh(&efx->filter_lock); + for (filter_idx = 0; filter_idx < table->size; ++filter_idx) { + if (table->spec[filter_idx].priority != EF4_FILTER_PRI_AUTO) + ef4_farch_filter_remove(efx, table, + filter_idx, priority); + } + spin_unlock_bh(&efx->filter_lock); +} + +int ef4_farch_filter_clear_rx(struct ef4_nic *efx, + enum ef4_filter_priority priority) +{ + ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_IP, + priority); + ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_MAC, + priority); + ef4_farch_filter_table_clear(efx, EF4_FARCH_FILTER_TABLE_RX_DEF, + priority); + return 0; +} + +u32 ef4_farch_filter_count_rx_used(struct ef4_nic *efx, + enum ef4_filter_priority priority) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + unsigned int filter_idx; + u32 count = 0; + + spin_lock_bh(&efx->filter_lock); + + for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP; + table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF; + table_id++) { + table = &state->table[table_id]; + for (filter_idx = 0; filter_idx < table->size; filter_idx++) { + if (test_bit(filter_idx, table->used_bitmap) && + table->spec[filter_idx].priority == priority) + ++count; + } + } + + spin_unlock_bh(&efx->filter_lock); + + return count; +} + +s32 ef4_farch_filter_get_rx_ids(struct ef4_nic *efx, + enum ef4_filter_priority priority, + u32 *buf, u32 size) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + unsigned int filter_idx; + s32 count = 0; + + spin_lock_bh(&efx->filter_lock); + + for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP; + table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF; + table_id++) { + table = &state->table[table_id]; + for (filter_idx = 0; filter_idx < table->size; filter_idx++) { + if (test_bit(filter_idx, table->used_bitmap) && + table->spec[filter_idx].priority == priority) { + if (count == size) { + count = -EMSGSIZE; + goto out; + } + buf[count++] = ef4_farch_filter_make_id( + &table->spec[filter_idx], filter_idx); + } + } + } +out: + spin_unlock_bh(&efx->filter_lock); + + return count; +} + +/* Restore filter stater after reset */ +void ef4_farch_filter_table_restore(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + ef4_oword_t filter; + unsigned int filter_idx; + + spin_lock_bh(&efx->filter_lock); + + for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) { + table = &state->table[table_id]; + + /* Check whether this is a regular register table */ + if (table->step == 0) + continue; + + for (filter_idx = 0; filter_idx < table->size; filter_idx++) { + if (!test_bit(filter_idx, table->used_bitmap)) + continue; + ef4_farch_filter_build(&filter, &table->spec[filter_idx]); + ef4_writeo(efx, &filter, + table->offset + table->step * filter_idx); + } + } + + ef4_farch_filter_push_rx_config(efx); + ef4_farch_filter_push_tx_limits(efx); + + spin_unlock_bh(&efx->filter_lock); +} + +void ef4_farch_filter_table_remove(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + + for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) { + kfree(state->table[table_id].used_bitmap); + vfree(state->table[table_id].spec); + } + kfree(state); +} + +int ef4_farch_filter_table_probe(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state; + struct ef4_farch_filter_table *table; + unsigned table_id; + + state = kzalloc(sizeof(struct ef4_farch_filter_state), GFP_KERNEL); + if (!state) + return -ENOMEM; + efx->filter_state = state; + + if (ef4_nic_rev(efx) >= EF4_REV_FALCON_B0) { + table = &state->table[EF4_FARCH_FILTER_TABLE_RX_IP]; + table->id = EF4_FARCH_FILTER_TABLE_RX_IP; + table->offset = FR_BZ_RX_FILTER_TBL0; + table->size = FR_BZ_RX_FILTER_TBL0_ROWS; + table->step = FR_BZ_RX_FILTER_TBL0_STEP; + } + + for (table_id = 0; table_id < EF4_FARCH_FILTER_TABLE_COUNT; table_id++) { + table = &state->table[table_id]; + if (table->size == 0) + continue; + table->used_bitmap = kcalloc(BITS_TO_LONGS(table->size), + sizeof(unsigned long), + GFP_KERNEL); + if (!table->used_bitmap) + goto fail; + table->spec = vzalloc(table->size * sizeof(*table->spec)); + if (!table->spec) + goto fail; + } + + table = &state->table[EF4_FARCH_FILTER_TABLE_RX_DEF]; + if (table->size) { + /* RX default filters must always exist */ + struct ef4_farch_filter_spec *spec; + unsigned i; + + for (i = 0; i < EF4_FARCH_FILTER_SIZE_RX_DEF; i++) { + spec = &table->spec[i]; + spec->type = EF4_FARCH_FILTER_UC_DEF + i; + ef4_farch_filter_init_rx_auto(efx, spec); + __set_bit(i, table->used_bitmap); + } + } + + ef4_farch_filter_push_rx_config(efx); + + return 0; + +fail: + ef4_farch_filter_table_remove(efx); + return -ENOMEM; +} + +/* Update scatter enable flags for filters pointing to our own RX queues */ +void ef4_farch_filter_update_rx_scatter(struct ef4_nic *efx) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + enum ef4_farch_filter_table_id table_id; + struct ef4_farch_filter_table *table; + ef4_oword_t filter; + unsigned int filter_idx; + + spin_lock_bh(&efx->filter_lock); + + for (table_id = EF4_FARCH_FILTER_TABLE_RX_IP; + table_id <= EF4_FARCH_FILTER_TABLE_RX_DEF; + table_id++) { + table = &state->table[table_id]; + + for (filter_idx = 0; filter_idx < table->size; filter_idx++) { + if (!test_bit(filter_idx, table->used_bitmap) || + table->spec[filter_idx].dmaq_id >= + efx->n_rx_channels) + continue; + + if (efx->rx_scatter) + table->spec[filter_idx].flags |= + EF4_FILTER_FLAG_RX_SCATTER; + else + table->spec[filter_idx].flags &= + ~EF4_FILTER_FLAG_RX_SCATTER; + + if (table_id == EF4_FARCH_FILTER_TABLE_RX_DEF) + /* Pushed by ef4_farch_filter_push_rx_config() */ + continue; + + ef4_farch_filter_build(&filter, &table->spec[filter_idx]); + ef4_writeo(efx, &filter, + table->offset + table->step * filter_idx); + } + } + + ef4_farch_filter_push_rx_config(efx); + + spin_unlock_bh(&efx->filter_lock); +} + +#ifdef CONFIG_RFS_ACCEL + +s32 ef4_farch_filter_rfs_insert(struct ef4_nic *efx, + struct ef4_filter_spec *gen_spec) +{ + return ef4_farch_filter_insert(efx, gen_spec, true); +} + +bool ef4_farch_filter_rfs_expire_one(struct ef4_nic *efx, u32 flow_id, + unsigned int index) +{ + struct ef4_farch_filter_state *state = efx->filter_state; + struct ef4_farch_filter_table *table = + &state->table[EF4_FARCH_FILTER_TABLE_RX_IP]; + + if (test_bit(index, table->used_bitmap) && + table->spec[index].priority == EF4_FILTER_PRI_HINT && + rps_may_expire_flow(efx->net_dev, table->spec[index].dmaq_id, + flow_id, index)) { + ef4_farch_filter_table_clear_entry(efx, table, index); + return true; + } + + return false; +} + +#endif /* CONFIG_RFS_ACCEL */ + +void ef4_farch_filter_sync_rx_mode(struct ef4_nic *efx) +{ + struct net_device *net_dev = efx->net_dev; + struct netdev_hw_addr *ha; + union ef4_multicast_hash *mc_hash = &efx->multicast_hash; + u32 crc; + int bit; + + if (!ef4_dev_registered(efx)) + return; + + netif_addr_lock_bh(net_dev); + + efx->unicast_filter = !(net_dev->flags & IFF_PROMISC); + + /* Build multicast hash table */ + if (net_dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { + memset(mc_hash, 0xff, sizeof(*mc_hash)); + } else { + memset(mc_hash, 0x00, sizeof(*mc_hash)); + netdev_for_each_mc_addr(ha, net_dev) { + crc = ether_crc_le(ETH_ALEN, ha->addr); + bit = crc & (EF4_MCAST_HASH_ENTRIES - 1); + __set_bit_le(bit, mc_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); + } + + netif_addr_unlock_bh(net_dev); +} |