2020-09-21 02:37:36 -06:00
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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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2016-08-10 05:03:22 -06:00
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/*
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2020-09-21 02:37:36 -06:00
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* Copyright 2015-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
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2016-08-10 05:03:22 -06:00
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*/
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#ifndef ENA_COM
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#define ENA_COM
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2017-02-09 06:21:35 -07:00
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#include <linux/compiler.h>
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2016-08-10 05:03:22 -06:00
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/gfp.h>
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2018-10-11 02:26:19 -06:00
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#include <linux/io.h>
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2018-10-21 09:07:14 -06:00
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#include <linux/prefetch.h>
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2016-08-10 05:03:22 -06:00
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#include <linux/sched.h>
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#include <linux/sizes.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/wait.h>
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2020-02-11 08:17:43 -07:00
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#include <linux/netdevice.h>
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2016-08-10 05:03:22 -06:00
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#include "ena_common_defs.h"
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#include "ena_admin_defs.h"
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#include "ena_eth_io_defs.h"
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#include "ena_regs_defs.h"
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#undef pr_fmt
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2020-05-03 03:52:20 -06:00
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#define ENA_MAX_NUM_IO_QUEUES 128U
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/* We need to queues for each IO (on for Tx and one for Rx) */
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2020-05-03 03:52:20 -06:00
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#define ENA_TOTAL_NUM_QUEUES (2 * (ENA_MAX_NUM_IO_QUEUES))
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#define ENA_MAX_HANDLERS 256
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#define ENA_MAX_PHYS_ADDR_SIZE_BITS 48
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/* Unit in usec */
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#define ENA_REG_READ_TIMEOUT 200000
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#define ADMIN_SQ_SIZE(depth) ((depth) * sizeof(struct ena_admin_aq_entry))
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#define ADMIN_CQ_SIZE(depth) ((depth) * sizeof(struct ena_admin_acq_entry))
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#define ADMIN_AENQ_SIZE(depth) ((depth) * sizeof(struct ena_admin_aenq_entry))
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/*****************************************************************************/
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/*****************************************************************************/
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/* ENA adaptive interrupt moderation settings */
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2020-05-03 03:52:20 -06:00
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#define ENA_INTR_INITIAL_TX_INTERVAL_USECS 64
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#define ENA_INTR_INITIAL_RX_INTERVAL_USECS 0
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#define ENA_DEFAULT_INTR_DELAY_RESOLUTION 1
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2016-08-10 05:03:22 -06:00
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2020-05-22 03:09:04 -06:00
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#define ENA_HASH_KEY_SIZE 40
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2020-05-03 03:52:20 -06:00
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#define ENA_HW_HINTS_NO_TIMEOUT 0xFFFF
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2017-06-23 02:21:51 -06:00
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2020-05-03 03:52:20 -06:00
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#define ENA_FEATURE_MAX_QUEUE_EXT_VER 1
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2019-06-11 05:58:05 -06:00
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2018-10-11 02:26:18 -06:00
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struct ena_llq_configurations {
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enum ena_admin_llq_header_location llq_header_location;
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enum ena_admin_llq_ring_entry_size llq_ring_entry_size;
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enum ena_admin_llq_stride_ctrl llq_stride_ctrl;
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enum ena_admin_llq_num_descs_before_header llq_num_decs_before_header;
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u16 llq_ring_entry_size_value;
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};
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enum queue_direction {
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ENA_COM_IO_QUEUE_DIRECTION_TX,
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ENA_COM_IO_QUEUE_DIRECTION_RX
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};
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struct ena_com_buf {
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dma_addr_t paddr; /**< Buffer physical address */
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u16 len; /**< Buffer length in bytes */
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};
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struct ena_com_rx_buf_info {
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u16 len;
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u16 req_id;
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};
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struct ena_com_io_desc_addr {
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u8 __iomem *pbuf_dev_addr; /* LLQ address */
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u8 *virt_addr;
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dma_addr_t phys_addr;
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};
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struct ena_com_tx_meta {
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u16 mss;
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u16 l3_hdr_len;
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u16 l3_hdr_offset;
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u16 l4_hdr_len; /* In words */
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};
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2018-10-11 02:26:18 -06:00
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struct ena_com_llq_info {
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u16 header_location_ctrl;
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u16 desc_stride_ctrl;
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u16 desc_list_entry_size_ctrl;
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u16 desc_list_entry_size;
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u16 descs_num_before_header;
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u16 descs_per_entry;
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u16 max_entries_in_tx_burst;
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2020-07-21 07:38:11 -06:00
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bool disable_meta_caching;
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2018-10-11 02:26:18 -06:00
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};
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2016-08-10 05:03:22 -06:00
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struct ena_com_io_cq {
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struct ena_com_io_desc_addr cdesc_addr;
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/* Interrupt unmask register */
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u32 __iomem *unmask_reg;
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/* The completion queue head doorbell register */
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u32 __iomem *cq_head_db_reg;
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/* numa configuration register (for TPH) */
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u32 __iomem *numa_node_cfg_reg;
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/* The value to write to the above register to unmask
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* the interrupt of this queue
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*/
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u32 msix_vector;
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enum queue_direction direction;
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/* holds the number of cdesc of the current packet */
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u16 cur_rx_pkt_cdesc_count;
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/* save the firt cdesc idx of the current packet */
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u16 cur_rx_pkt_cdesc_start_idx;
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u16 q_depth;
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/* Caller qid */
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u16 qid;
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/* Device queue index */
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u16 idx;
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u16 head;
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u16 last_head_update;
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u8 phase;
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u8 cdesc_entry_size_in_bytes;
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} ____cacheline_aligned;
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2018-10-11 02:26:18 -06:00
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struct ena_com_io_bounce_buffer_control {
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u8 *base_buffer;
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u16 next_to_use;
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u16 buffer_size;
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u16 buffers_num; /* Must be a power of 2 */
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};
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/* This struct is to keep tracking the current location of the next llq entry */
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struct ena_com_llq_pkt_ctrl {
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u8 *curr_bounce_buf;
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u16 idx;
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u16 descs_left_in_line;
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};
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2016-08-10 05:03:22 -06:00
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struct ena_com_io_sq {
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struct ena_com_io_desc_addr desc_addr;
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u32 __iomem *db_addr;
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u8 __iomem *header_addr;
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enum queue_direction direction;
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enum ena_admin_placement_policy_type mem_queue_type;
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2020-07-21 07:38:11 -06:00
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bool disable_meta_caching;
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2016-08-10 05:03:22 -06:00
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u32 msix_vector;
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struct ena_com_tx_meta cached_tx_meta;
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2018-10-11 02:26:18 -06:00
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struct ena_com_llq_info llq_info;
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struct ena_com_llq_pkt_ctrl llq_buf_ctrl;
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struct ena_com_io_bounce_buffer_control bounce_buf_ctrl;
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u16 q_depth;
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u16 qid;
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u16 idx;
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u16 tail;
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u16 next_to_comp;
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u16 llq_last_copy_tail;
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u32 tx_max_header_size;
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u8 phase;
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u8 desc_entry_size;
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u8 dma_addr_bits;
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u16 entries_in_tx_burst_left;
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2016-08-10 05:03:22 -06:00
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} ____cacheline_aligned;
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struct ena_com_admin_cq {
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struct ena_admin_acq_entry *entries;
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dma_addr_t dma_addr;
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u16 head;
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u8 phase;
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};
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struct ena_com_admin_sq {
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struct ena_admin_aq_entry *entries;
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dma_addr_t dma_addr;
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u32 __iomem *db_addr;
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u16 head;
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u16 tail;
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u8 phase;
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};
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struct ena_com_stats_admin {
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2020-07-21 07:38:07 -06:00
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u64 aborted_cmd;
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u64 submitted_cmd;
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u64 completed_cmd;
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u64 out_of_space;
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u64 no_completion;
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};
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struct ena_com_admin_queue {
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void *q_dmadev;
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struct ena_com_dev *ena_dev;
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spinlock_t q_lock; /* spinlock for the admin queue */
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2016-08-10 05:03:22 -06:00
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struct ena_comp_ctx *comp_ctx;
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u32 completion_timeout;
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u16 q_depth;
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struct ena_com_admin_cq cq;
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struct ena_com_admin_sq sq;
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/* Indicate if the admin queue should poll for completion */
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bool polling;
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2019-06-03 08:43:25 -06:00
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/* Define if fallback to polling mode should occur */
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bool auto_polling;
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2016-08-10 05:03:22 -06:00
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u16 curr_cmd_id;
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/* Indicate that the ena was initialized and can
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* process new admin commands
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*/
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bool running_state;
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/* Count the number of outstanding admin commands */
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atomic_t outstanding_cmds;
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struct ena_com_stats_admin stats;
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};
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struct ena_aenq_handlers;
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struct ena_com_aenq {
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u16 head;
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u8 phase;
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struct ena_admin_aenq_entry *entries;
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dma_addr_t dma_addr;
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u16 q_depth;
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struct ena_aenq_handlers *aenq_handlers;
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};
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struct ena_com_mmio_read {
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struct ena_admin_ena_mmio_req_read_less_resp *read_resp;
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dma_addr_t read_resp_dma_addr;
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u32 reg_read_to; /* in us */
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u16 seq_num;
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bool readless_supported;
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/* spin lock to ensure a single outstanding read */
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spinlock_t lock;
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};
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struct ena_rss {
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/* Indirect table */
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u16 *host_rss_ind_tbl;
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struct ena_admin_rss_ind_table_entry *rss_ind_tbl;
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dma_addr_t rss_ind_tbl_dma_addr;
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u16 tbl_log_size;
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/* Hash key */
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enum ena_admin_hash_functions hash_func;
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struct ena_admin_feature_rss_flow_hash_control *hash_key;
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dma_addr_t hash_key_dma_addr;
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u32 hash_init_val;
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/* Flow Control */
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struct ena_admin_feature_rss_hash_control *hash_ctrl;
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dma_addr_t hash_ctrl_dma_addr;
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};
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struct ena_host_attribute {
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/* Debug area */
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u8 *debug_area_virt_addr;
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dma_addr_t debug_area_dma_addr;
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u32 debug_area_size;
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/* Host information */
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struct ena_admin_host_info *host_info;
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dma_addr_t host_info_dma_addr;
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};
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/* Each ena_dev is a PCI function. */
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struct ena_com_dev {
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struct ena_com_admin_queue admin_queue;
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struct ena_com_aenq aenq;
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struct ena_com_io_cq io_cq_queues[ENA_TOTAL_NUM_QUEUES];
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struct ena_com_io_sq io_sq_queues[ENA_TOTAL_NUM_QUEUES];
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u8 __iomem *reg_bar;
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void __iomem *mem_bar;
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void *dmadev;
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enum ena_admin_placement_policy_type tx_mem_queue_type;
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u32 tx_max_header_size;
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u16 stats_func; /* Selected function for extended statistic dump */
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u16 stats_queue; /* Selected queue for extended statistic dump */
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struct ena_com_mmio_read mmio_read;
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struct ena_rss rss;
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u32 supported_features;
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u32 dma_addr_bits;
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struct ena_host_attribute host_attr;
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bool adaptive_coalescing;
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u16 intr_delay_resolution;
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2019-09-16 05:31:26 -06:00
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/* interrupt moderation intervals are in usec divided by
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* intr_delay_resolution, which is supplied by the device.
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*/
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2016-08-10 05:03:22 -06:00
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u32 intr_moder_tx_interval;
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2019-09-16 05:31:26 -06:00
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u32 intr_moder_rx_interval;
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2016-08-10 05:03:22 -06:00
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struct ena_intr_moder_entry *intr_moder_tbl;
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2018-10-11 02:26:18 -06:00
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struct ena_com_llq_info llq_info;
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2020-05-22 03:09:05 -06:00
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u32 ena_min_poll_delay_us;
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2016-08-10 05:03:22 -06:00
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};
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struct ena_com_dev_get_features_ctx {
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struct ena_admin_queue_feature_desc max_queues;
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2019-06-11 05:58:05 -06:00
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struct ena_admin_queue_ext_feature_desc max_queue_ext;
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2016-08-10 05:03:22 -06:00
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struct ena_admin_device_attr_feature_desc dev_attr;
|
|
|
|
struct ena_admin_feature_aenq_desc aenq;
|
|
|
|
struct ena_admin_feature_offload_desc offload;
|
2017-06-23 02:21:51 -06:00
|
|
|
struct ena_admin_ena_hw_hints hw_hints;
|
2018-10-11 02:26:18 -06:00
|
|
|
struct ena_admin_feature_llq_desc llq;
|
2016-08-10 05:03:22 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
struct ena_com_create_io_ctx {
|
|
|
|
enum ena_admin_placement_policy_type mem_queue_type;
|
|
|
|
enum queue_direction direction;
|
|
|
|
int numa_node;
|
|
|
|
u32 msix_vector;
|
|
|
|
u16 queue_size;
|
|
|
|
u16 qid;
|
|
|
|
};
|
|
|
|
|
|
|
|
typedef void (*ena_aenq_handler)(void *data,
|
|
|
|
struct ena_admin_aenq_entry *aenq_e);
|
|
|
|
|
|
|
|
/* Holds aenq handlers. Indexed by AENQ event group */
|
|
|
|
struct ena_aenq_handlers {
|
|
|
|
ena_aenq_handler handlers[ENA_MAX_HANDLERS];
|
|
|
|
ena_aenq_handler unimplemented_handler;
|
|
|
|
};
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
/* ena_com_mmio_reg_read_request_init - Init the mmio reg read mechanism
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Initialize the register read mechanism.
|
|
|
|
*
|
|
|
|
* @note: This method must be the first stage in the initialization sequence.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_mmio_reg_read_request_init(struct ena_com_dev *ena_dev);
|
|
|
|
|
2020-05-22 03:08:59 -06:00
|
|
|
/* ena_com_set_mmio_read_mode - Enable/disable the indirect mmio reg read mechanism
|
2016-08-10 05:03:22 -06:00
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @readless_supported: readless mode (enable/disable)
|
|
|
|
*/
|
|
|
|
void ena_com_set_mmio_read_mode(struct ena_com_dev *ena_dev,
|
|
|
|
bool readless_supported);
|
|
|
|
|
|
|
|
/* ena_com_mmio_reg_read_request_write_dev_addr - Write the mmio reg read return
|
|
|
|
* value physical address.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*/
|
|
|
|
void ena_com_mmio_reg_read_request_write_dev_addr(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_mmio_reg_read_request_destroy - Destroy the mmio reg read mechanism
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*/
|
|
|
|
void ena_com_mmio_reg_read_request_destroy(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_admin_init - Init the admin and the async queues
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @aenq_handlers: Those handlers to be called upon event.
|
|
|
|
*
|
|
|
|
* Initialize the admin submission and completion queues.
|
|
|
|
* Initialize the asynchronous events notification queues.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_admin_init(struct ena_com_dev *ena_dev,
|
2018-10-11 02:26:25 -06:00
|
|
|
struct ena_aenq_handlers *aenq_handlers);
|
2016-08-10 05:03:22 -06:00
|
|
|
|
|
|
|
/* ena_com_admin_destroy - Destroy the admin and the async events queues.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @note: Before calling this method, the caller must validate that the device
|
|
|
|
* won't send any additional admin completions/aenq.
|
|
|
|
* To achieve that, a FLR is recommended.
|
|
|
|
*/
|
|
|
|
void ena_com_admin_destroy(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_dev_reset - Perform device FLR to the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
2017-06-23 02:21:53 -06:00
|
|
|
* @reset_reason: Specify what is the trigger for the reset in case of an error.
|
2016-08-10 05:03:22 -06:00
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
2017-06-23 02:21:53 -06:00
|
|
|
int ena_com_dev_reset(struct ena_com_dev *ena_dev,
|
|
|
|
enum ena_regs_reset_reason_types reset_reason);
|
2016-08-10 05:03:22 -06:00
|
|
|
|
|
|
|
/* ena_com_create_io_queue - Create io queue.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @ctx - create context structure
|
|
|
|
*
|
|
|
|
* Create the submission and the completion queues.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_create_io_queue(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_com_create_io_ctx *ctx);
|
|
|
|
|
|
|
|
/* ena_com_destroy_io_queue - Destroy IO queue with the queue id - qid.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @qid - the caller virtual queue id.
|
|
|
|
*/
|
|
|
|
void ena_com_destroy_io_queue(struct ena_com_dev *ena_dev, u16 qid);
|
|
|
|
|
|
|
|
/* ena_com_get_io_handlers - Return the io queue handlers
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @qid - the caller virtual queue id.
|
|
|
|
* @io_sq - IO submission queue handler
|
|
|
|
* @io_cq - IO completion queue handler.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_get_io_handlers(struct ena_com_dev *ena_dev, u16 qid,
|
|
|
|
struct ena_com_io_sq **io_sq,
|
|
|
|
struct ena_com_io_cq **io_cq);
|
|
|
|
|
|
|
|
/* ena_com_admin_aenq_enable - ENAble asynchronous event notifications
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* After this method, aenq event can be received via AENQ.
|
|
|
|
*/
|
|
|
|
void ena_com_admin_aenq_enable(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_set_admin_running_state - Set the state of the admin queue
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Change the state of the admin queue (enable/disable)
|
|
|
|
*/
|
|
|
|
void ena_com_set_admin_running_state(struct ena_com_dev *ena_dev, bool state);
|
|
|
|
|
|
|
|
/* ena_com_get_admin_running_state - Get the admin queue state
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Retrieve the state of the admin queue (enable/disable)
|
|
|
|
*
|
|
|
|
* @return - current polling mode (enable/disable)
|
|
|
|
*/
|
|
|
|
bool ena_com_get_admin_running_state(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_set_admin_polling_mode - Set the admin completion queue polling mode
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @polling: ENAble/Disable polling mode
|
|
|
|
*
|
|
|
|
* Set the admin completion mode.
|
|
|
|
*/
|
|
|
|
void ena_com_set_admin_polling_mode(struct ena_com_dev *ena_dev, bool polling);
|
|
|
|
|
2019-06-03 08:43:25 -06:00
|
|
|
/* ena_com_set_admin_auto_polling_mode - Enable autoswitch to polling mode
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @polling: Enable/Disable polling mode
|
|
|
|
*
|
|
|
|
* Set the autopolling mode.
|
|
|
|
* If autopolling is on:
|
|
|
|
* In case of missing interrupt when data is available switch to polling.
|
|
|
|
*/
|
|
|
|
void ena_com_set_admin_auto_polling_mode(struct ena_com_dev *ena_dev,
|
|
|
|
bool polling);
|
|
|
|
|
2016-08-10 05:03:22 -06:00
|
|
|
/* ena_com_admin_q_comp_intr_handler - admin queue interrupt handler
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* This method goes over the admin completion queue and wakes up all the pending
|
2016-08-10 05:03:22 -06:00
|
|
|
* threads that wait on the commands wait event.
|
|
|
|
*
|
|
|
|
* @note: Should be called after MSI-X interrupt.
|
|
|
|
*/
|
|
|
|
void ena_com_admin_q_comp_intr_handler(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_aenq_intr_handler - AENQ interrupt handler
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* This method goes over the async event notification queue and calls the proper
|
2016-08-10 05:03:22 -06:00
|
|
|
* aenq handler.
|
|
|
|
*/
|
2020-09-21 02:37:38 -06:00
|
|
|
void ena_com_aenq_intr_handler(struct ena_com_dev *ena_dev, void *data);
|
2016-08-10 05:03:22 -06:00
|
|
|
|
|
|
|
/* ena_com_abort_admin_commands - Abort all the outstanding admin commands.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* This method aborts all the outstanding admin commands.
|
|
|
|
* The caller should then call ena_com_wait_for_abort_completion to make sure
|
|
|
|
* all the commands were completed.
|
|
|
|
*/
|
|
|
|
void ena_com_abort_admin_commands(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_wait_for_abort_completion - Wait for admin commands abort.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* This method waits until all the outstanding admin commands are completed.
|
2016-08-10 05:03:22 -06:00
|
|
|
*/
|
|
|
|
void ena_com_wait_for_abort_completion(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_validate_version - Validate the device parameters
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* This method verifies the device parameters are the same as the saved
|
2016-08-10 05:03:22 -06:00
|
|
|
* parameters in ena_dev.
|
|
|
|
* This method is useful after device reset, to validate the device mac address
|
|
|
|
* and the device offloads are the same as before the reset.
|
|
|
|
*
|
|
|
|
* @return - 0 on success negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_validate_version(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_get_link_params - Retrieve physical link parameters.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @resp: Link parameters
|
|
|
|
*
|
|
|
|
* Retrieve the physical link parameters,
|
|
|
|
* like speed, auto-negotiation and full duplex support.
|
|
|
|
*
|
|
|
|
* @return - 0 on Success negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_link_params(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_admin_get_feat_resp *resp);
|
|
|
|
|
|
|
|
/* ena_com_get_dma_width - Retrieve physical dma address width the device
|
|
|
|
* supports.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Retrieve the maximum physical address bits the device can handle.
|
|
|
|
*
|
|
|
|
* @return: > 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_dma_width(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_set_aenq_config - Set aenq groups configurations
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @groups flag: bit fields flags of enum ena_admin_aenq_group.
|
|
|
|
*
|
|
|
|
* Configure which aenq event group the driver would like to receive.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_aenq_config(struct ena_com_dev *ena_dev, u32 groups_flag);
|
|
|
|
|
|
|
|
/* ena_com_get_dev_attr_feat - Get device features
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @get_feat_ctx: returned context that contain the get features.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_dev_attr_feat(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_com_dev_get_features_ctx *get_feat_ctx);
|
|
|
|
|
|
|
|
/* ena_com_get_dev_basic_stats - Get device basic statistics
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @stats: stats return value
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_dev_basic_stats(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_admin_basic_stats *stats);
|
|
|
|
|
2020-09-10 07:07:11 -06:00
|
|
|
/* ena_com_get_eni_stats - Get extended network interface statistics
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @stats: stats return value
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_eni_stats(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_admin_eni_stats *stats);
|
|
|
|
|
2016-08-10 05:03:22 -06:00
|
|
|
/* ena_com_set_dev_mtu - Configure the device mtu.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @mtu: mtu value
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_dev_mtu(struct ena_com_dev *ena_dev, int mtu);
|
|
|
|
|
|
|
|
/* ena_com_get_offload_settings - Retrieve the device offloads capabilities
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @offlad: offload return value
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_offload_settings(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_admin_feature_offload_desc *offload);
|
|
|
|
|
|
|
|
/* ena_com_rss_init - Init RSS
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @log_size: indirection log size
|
|
|
|
*
|
|
|
|
* Allocate RSS/RFS resources.
|
|
|
|
* The caller then can configure rss using ena_com_set_hash_function,
|
|
|
|
* ena_com_set_hash_ctrl and ena_com_indirect_table_set.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_rss_init(struct ena_com_dev *ena_dev, u16 log_size);
|
|
|
|
|
|
|
|
/* ena_com_rss_destroy - Destroy rss
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Free all the RSS/RFS resources.
|
|
|
|
*/
|
|
|
|
void ena_com_rss_destroy(struct ena_com_dev *ena_dev);
|
|
|
|
|
2020-02-11 08:17:49 -07:00
|
|
|
/* ena_com_get_current_hash_function - Get RSS hash function
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Return the current hash function.
|
|
|
|
* @return: 0 or one of the ena_admin_hash_functions values.
|
|
|
|
*/
|
|
|
|
int ena_com_get_current_hash_function(struct ena_com_dev *ena_dev);
|
|
|
|
|
2016-08-10 05:03:22 -06:00
|
|
|
/* ena_com_fill_hash_function - Fill RSS hash function
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @func: The hash function (Toeplitz or crc)
|
|
|
|
* @key: Hash key (for toeplitz hash)
|
|
|
|
* @key_len: key length (max length 10 DW)
|
|
|
|
* @init_val: initial value for the hash function
|
|
|
|
*
|
|
|
|
* Fill the ena_dev resources with the desire hash function, hash key, key_len
|
|
|
|
* and key initial value (if needed by the hash function).
|
|
|
|
* To flush the key into the device the caller should call
|
|
|
|
* ena_com_set_hash_function.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_fill_hash_function(struct ena_com_dev *ena_dev,
|
|
|
|
enum ena_admin_hash_functions func,
|
|
|
|
const u8 *key, u16 key_len, u32 init_val);
|
|
|
|
|
|
|
|
/* ena_com_set_hash_function - Flush the hash function and it dependencies to
|
|
|
|
* the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Flush the hash function and it dependencies (key, key length and
|
|
|
|
* initial value) if needed.
|
|
|
|
*
|
|
|
|
* @note: Prior to this method the caller should call ena_com_fill_hash_function
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_hash_function(struct ena_com_dev *ena_dev);
|
|
|
|
|
2020-05-03 03:52:12 -06:00
|
|
|
/* ena_com_get_hash_function - Retrieve the hash function from the device.
|
2016-08-10 05:03:22 -06:00
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @func: hash function
|
|
|
|
*
|
2020-05-03 03:52:12 -06:00
|
|
|
* Retrieve the hash function from the device.
|
2016-08-10 05:03:22 -06:00
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* @note: If the caller called ena_com_fill_hash_function but didn't flush
|
2016-08-10 05:03:22 -06:00
|
|
|
* it to the device, the new configuration will be lost.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_hash_function(struct ena_com_dev *ena_dev,
|
2020-05-03 03:52:12 -06:00
|
|
|
enum ena_admin_hash_functions *func);
|
2016-08-10 05:03:22 -06:00
|
|
|
|
2020-05-03 03:52:12 -06:00
|
|
|
/* ena_com_get_hash_key - Retrieve the hash key
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @key: hash key
|
|
|
|
*
|
|
|
|
* Retrieve the hash key.
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* @note: If the caller called ena_com_fill_hash_key but didn't flush
|
2020-05-03 03:52:12 -06:00
|
|
|
* it to the device, the new configuration will be lost.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_hash_key(struct ena_com_dev *ena_dev, u8 *key);
|
2016-08-10 05:03:22 -06:00
|
|
|
/* ena_com_fill_hash_ctrl - Fill RSS hash control
|
|
|
|
* @ena_dev: ENA communication layer struct.
|
|
|
|
* @proto: The protocol to configure.
|
|
|
|
* @hash_fields: bit mask of ena_admin_flow_hash_fields
|
|
|
|
*
|
|
|
|
* Fill the ena_dev resources with the desire hash control (the ethernet
|
|
|
|
* fields that take part of the hash) for a specific protocol.
|
|
|
|
* To flush the hash control to the device, the caller should call
|
|
|
|
* ena_com_set_hash_ctrl.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_fill_hash_ctrl(struct ena_com_dev *ena_dev,
|
|
|
|
enum ena_admin_flow_hash_proto proto,
|
|
|
|
u16 hash_fields);
|
|
|
|
|
|
|
|
/* ena_com_set_hash_ctrl - Flush the hash control resources to the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Flush the hash control (the ethernet fields that take part of the hash)
|
|
|
|
*
|
|
|
|
* @note: Prior to this method the caller should call ena_com_fill_hash_ctrl.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_hash_ctrl(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_get_hash_ctrl - Retrieve the hash control from the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @proto: The protocol to retrieve.
|
|
|
|
* @fields: bit mask of ena_admin_flow_hash_fields.
|
|
|
|
*
|
|
|
|
* Retrieve the hash control from the device.
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* @note: If the caller called ena_com_fill_hash_ctrl but didn't flush
|
2016-08-10 05:03:22 -06:00
|
|
|
* it to the device, the new configuration will be lost.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_get_hash_ctrl(struct ena_com_dev *ena_dev,
|
|
|
|
enum ena_admin_flow_hash_proto proto,
|
|
|
|
u16 *fields);
|
|
|
|
|
|
|
|
/* ena_com_set_default_hash_ctrl - Set the hash control to a default
|
|
|
|
* configuration.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Fill the ena_dev resources with the default hash control configuration.
|
|
|
|
* To flush the hash control to the device, the caller should call
|
|
|
|
* ena_com_set_hash_ctrl.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_default_hash_ctrl(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_indirect_table_fill_entry - Fill a single entry in the RSS
|
|
|
|
* indirection table
|
|
|
|
* @ena_dev: ENA communication layer struct.
|
|
|
|
* @entry_idx - indirection table entry.
|
|
|
|
* @entry_value - redirection value
|
|
|
|
*
|
|
|
|
* Fill a single entry of the RSS indirection table in the ena_dev resources.
|
|
|
|
* To flush the indirection table to the device, the called should call
|
|
|
|
* ena_com_indirect_table_set.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_indirect_table_fill_entry(struct ena_com_dev *ena_dev,
|
|
|
|
u16 entry_idx, u16 entry_value);
|
|
|
|
|
|
|
|
/* ena_com_indirect_table_set - Flush the indirection table to the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* Flush the indirection hash control to the device.
|
|
|
|
* Prior to this method the caller should call ena_com_indirect_table_fill_entry
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_indirect_table_set(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_indirect_table_get - Retrieve the indirection table from the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @ind_tbl: indirection table
|
|
|
|
*
|
|
|
|
* Retrieve the RSS indirection table from the device.
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* @note: If the caller called ena_com_indirect_table_fill_entry but didn't flush
|
2016-08-10 05:03:22 -06:00
|
|
|
* it to the device, the new configuration will be lost.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_indirect_table_get(struct ena_com_dev *ena_dev, u32 *ind_tbl);
|
|
|
|
|
|
|
|
/* ena_com_allocate_host_info - Allocate host info resources.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_allocate_host_info(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_allocate_debug_area - Allocate debug area.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @debug_area_size - debug area size.
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_allocate_debug_area(struct ena_com_dev *ena_dev,
|
|
|
|
u32 debug_area_size);
|
|
|
|
|
|
|
|
/* ena_com_delete_debug_area - Free the debug area resources.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* Free the allocated debug area.
|
2016-08-10 05:03:22 -06:00
|
|
|
*/
|
|
|
|
void ena_com_delete_debug_area(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_delete_host_info - Free the host info resources.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
2020-05-22 03:08:59 -06:00
|
|
|
* Free the allocated host info.
|
2016-08-10 05:03:22 -06:00
|
|
|
*/
|
|
|
|
void ena_com_delete_host_info(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_set_host_attributes - Update the device with the host
|
|
|
|
* attributes (debug area and host info) base address.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @return: 0 on Success and negative value otherwise.
|
|
|
|
*/
|
|
|
|
int ena_com_set_host_attributes(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_create_io_cq - Create io completion queue.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @io_cq - io completion queue handler
|
|
|
|
|
|
|
|
* Create IO completion queue.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_create_io_cq(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_com_io_cq *io_cq);
|
|
|
|
|
|
|
|
/* ena_com_destroy_io_cq - Destroy io completion queue.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @io_cq - io completion queue handler
|
|
|
|
|
|
|
|
* Destroy IO completion queue.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_destroy_io_cq(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_com_io_cq *io_cq);
|
|
|
|
|
|
|
|
/* ena_com_execute_admin_command - Execute admin command
|
|
|
|
* @admin_queue: admin queue.
|
|
|
|
* @cmd: the admin command to execute.
|
|
|
|
* @cmd_size: the command size.
|
|
|
|
* @cmd_completion: command completion return value.
|
|
|
|
* @cmd_comp_size: command completion size.
|
|
|
|
|
2020-05-22 03:08:59 -06:00
|
|
|
* Submit an admin command and then wait until the device returns a
|
2016-08-10 05:03:22 -06:00
|
|
|
* completion.
|
2020-05-22 03:08:59 -06:00
|
|
|
* The completion will be copied into cmd_comp.
|
2016-08-10 05:03:22 -06:00
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_execute_admin_command(struct ena_com_admin_queue *admin_queue,
|
|
|
|
struct ena_admin_aq_entry *cmd,
|
|
|
|
size_t cmd_size,
|
|
|
|
struct ena_admin_acq_entry *cmd_comp,
|
|
|
|
size_t cmd_comp_size);
|
|
|
|
|
|
|
|
/* ena_com_init_interrupt_moderation - Init interrupt moderation
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_init_interrupt_moderation(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_interrupt_moderation_supported - Return if interrupt moderation
|
|
|
|
* capability is supported by the device.
|
|
|
|
*
|
|
|
|
* @return - supported or not.
|
|
|
|
*/
|
|
|
|
bool ena_com_interrupt_moderation_supported(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_update_nonadaptive_moderation_interval_tx - Update the
|
|
|
|
* non-adaptive interval in Tx direction.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @tx_coalesce_usecs: Interval in usec.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_update_nonadaptive_moderation_interval_tx(struct ena_com_dev *ena_dev,
|
|
|
|
u32 tx_coalesce_usecs);
|
|
|
|
|
|
|
|
/* ena_com_update_nonadaptive_moderation_interval_rx - Update the
|
|
|
|
* non-adaptive interval in Rx direction.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @rx_coalesce_usecs: Interval in usec.
|
|
|
|
*
|
|
|
|
* @return - 0 on success, negative value on failure.
|
|
|
|
*/
|
|
|
|
int ena_com_update_nonadaptive_moderation_interval_rx(struct ena_com_dev *ena_dev,
|
|
|
|
u32 rx_coalesce_usecs);
|
|
|
|
|
|
|
|
/* ena_com_get_nonadaptive_moderation_interval_tx - Retrieve the
|
|
|
|
* non-adaptive interval in Tx direction.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @return - interval in usec
|
|
|
|
*/
|
|
|
|
unsigned int ena_com_get_nonadaptive_moderation_interval_tx(struct ena_com_dev *ena_dev);
|
|
|
|
|
|
|
|
/* ena_com_get_nonadaptive_moderation_interval_rx - Retrieve the
|
|
|
|
* non-adaptive interval in Rx direction.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
*
|
|
|
|
* @return - interval in usec
|
|
|
|
*/
|
|
|
|
unsigned int ena_com_get_nonadaptive_moderation_interval_rx(struct ena_com_dev *ena_dev);
|
|
|
|
|
2018-10-11 02:26:19 -06:00
|
|
|
/* ena_com_config_dev_mode - Configure the placement policy of the device.
|
|
|
|
* @ena_dev: ENA communication layer struct
|
|
|
|
* @llq_features: LLQ feature descriptor, retrieve via
|
2020-05-22 03:08:59 -06:00
|
|
|
* ena_com_get_dev_attr_feat.
|
2018-10-11 02:26:19 -06:00
|
|
|
* @ena_llq_config: The default driver LLQ parameters configurations
|
|
|
|
*/
|
|
|
|
int ena_com_config_dev_mode(struct ena_com_dev *ena_dev,
|
|
|
|
struct ena_admin_feature_llq_desc *llq_features,
|
|
|
|
struct ena_llq_configurations *llq_default_config);
|
|
|
|
|
2016-08-10 05:03:22 -06:00
|
|
|
static inline bool ena_com_get_adaptive_moderation_enabled(struct ena_com_dev *ena_dev)
|
|
|
|
{
|
|
|
|
return ena_dev->adaptive_coalescing;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void ena_com_enable_adaptive_moderation(struct ena_com_dev *ena_dev)
|
|
|
|
{
|
|
|
|
ena_dev->adaptive_coalescing = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void ena_com_disable_adaptive_moderation(struct ena_com_dev *ena_dev)
|
|
|
|
{
|
|
|
|
ena_dev->adaptive_coalescing = false;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ena_com_update_intr_reg - Prepare interrupt register
|
|
|
|
* @intr_reg: interrupt register to update.
|
|
|
|
* @rx_delay_interval: Rx interval in usecs
|
|
|
|
* @tx_delay_interval: Tx interval in usecs
|
2020-05-22 03:08:59 -06:00
|
|
|
* @unmask: unmask enable/disable
|
2016-08-10 05:03:22 -06:00
|
|
|
*
|
|
|
|
* Prepare interrupt update register with the supplied parameters.
|
|
|
|
*/
|
|
|
|
static inline void ena_com_update_intr_reg(struct ena_eth_io_intr_reg *intr_reg,
|
|
|
|
u32 rx_delay_interval,
|
|
|
|
u32 tx_delay_interval,
|
|
|
|
bool unmask)
|
|
|
|
{
|
|
|
|
intr_reg->intr_control = 0;
|
|
|
|
intr_reg->intr_control |= rx_delay_interval &
|
|
|
|
ENA_ETH_IO_INTR_REG_RX_INTR_DELAY_MASK;
|
|
|
|
|
|
|
|
intr_reg->intr_control |=
|
|
|
|
(tx_delay_interval << ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_SHIFT)
|
|
|
|
& ENA_ETH_IO_INTR_REG_TX_INTR_DELAY_MASK;
|
|
|
|
|
|
|
|
if (unmask)
|
|
|
|
intr_reg->intr_control |= ENA_ETH_IO_INTR_REG_INTR_UNMASK_MASK;
|
|
|
|
}
|
|
|
|
|
2018-10-11 02:26:19 -06:00
|
|
|
static inline u8 *ena_com_get_next_bounce_buffer(struct ena_com_io_bounce_buffer_control *bounce_buf_ctrl)
|
|
|
|
{
|
|
|
|
u16 size, buffers_num;
|
|
|
|
u8 *buf;
|
|
|
|
|
|
|
|
size = bounce_buf_ctrl->buffer_size;
|
|
|
|
buffers_num = bounce_buf_ctrl->buffers_num;
|
|
|
|
|
|
|
|
buf = bounce_buf_ctrl->base_buffer +
|
|
|
|
(bounce_buf_ctrl->next_to_use++ & (buffers_num - 1)) * size;
|
|
|
|
|
|
|
|
prefetchw(bounce_buf_ctrl->base_buffer +
|
|
|
|
(bounce_buf_ctrl->next_to_use & (buffers_num - 1)) * size);
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
}
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|
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|
2016-08-10 05:03:22 -06:00
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#endif /* !(ENA_COM) */
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