FreeBSD/Linux Kernel Cross Reference
sys/dev/ena/ena.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2015-2020 Amazon.com, Inc. or its affiliates.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     *
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     *
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     *
     */
    
    #ifndef ENA_H
    #define ENA_H
    
    #include "opt_rss.h"
    
    #include "ena-com/ena_com.h"
    #include "ena-com/ena_eth_com.h"
    
    #define DRV_MODULE_VER_MAJOR    2
    #define DRV_MODULE_VER_MINOR    4
    #define DRV_MODULE_VER_SUBMINOR 1
    
    #define DRV_MODULE_NAME         "ena"
    
    #ifndef DRV_MODULE_VERSION
    #define DRV_MODULE_VERSION                              \
            __XSTRING(DRV_MODULE_VER_MAJOR) "."             \
            __XSTRING(DRV_MODULE_VER_MINOR) "."             \
            __XSTRING(DRV_MODULE_VER_SUBMINOR)
    #endif
    #define DEVICE_NAME     "Elastic Network Adapter (ENA)"
    #define DEVICE_DESC     "ENA adapter"
    
    /* Calculate DMA mask - width for ena cannot exceed 48, so it is safe */
    #define ENA_DMA_BIT_MASK(x)             ((1ULL << (x)) - 1ULL)
    
    /* 1 for AENQ + ADMIN */
    #define ENA_ADMIN_MSIX_VEC              1
    #define ENA_MAX_MSIX_VEC(io_queues)     (ENA_ADMIN_MSIX_VEC + (io_queues))
    
    #define ENA_REG_BAR                     0
    #define ENA_MEM_BAR                     2
    
    #define ENA_BUS_DMA_SEGS                32
    
    #define ENA_DEFAULT_BUF_RING_SIZE       4096
    
    #define ENA_DEFAULT_RING_SIZE           1024
    #define ENA_MIN_RING_SIZE               256
    
    /*
     * Refill Rx queue when number of required descriptors is above
     * QUEUE_SIZE / ENA_RX_REFILL_THRESH_DIVIDER or ENA_RX_REFILL_THRESH_PACKET
     */
    #define ENA_RX_REFILL_THRESH_DIVIDER    8
    #define ENA_RX_REFILL_THRESH_PACKET     256
    
    #define ENA_IRQNAME_SIZE                40
    
    #define ENA_PKT_MAX_BUFS                19
    
    #define ENA_RX_RSS_TABLE_LOG_SIZE       7
    #define ENA_RX_RSS_TABLE_SIZE           (1 << ENA_RX_RSS_TABLE_LOG_SIZE)
    
    #define ENA_HASH_KEY_SIZE               40
    
    #define ENA_MAX_FRAME_LEN               10000
    #define ENA_MIN_FRAME_LEN               60
    
    #define ENA_TX_RESUME_THRESH            (ENA_PKT_MAX_BUFS + 2)
    
    #define DB_THRESHOLD    64
    
    #define TX_COMMIT       32
     /*
     * TX budget for cleaning. It should be half of the RX budget to reduce amount
    *  of TCP retransmissions.
    */
   #define TX_BUDGET       128
   /* RX cleanup budget. -1 stands for infinity. */
   #define RX_BUDGET       256
   /*
    * How many times we can repeat cleanup in the io irq handling routine if the
    * RX or TX budget was depleted.
    */
   #define CLEAN_BUDGET    8
   
   #define RX_IRQ_INTERVAL 20
   #define TX_IRQ_INTERVAL 50
   
   #define ENA_MIN_MTU             128
   
   #define ENA_TSO_MAXSIZE         65536
   
   #define ENA_MMIO_DISABLE_REG_READ       BIT(0)
   
   #define ENA_TX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
   
   #define ENA_RX_RING_IDX_NEXT(idx, ring_size) (((idx) + 1) & ((ring_size) - 1))
   
   #define ENA_IO_TXQ_IDX(q)               (2 * (q))
   #define ENA_IO_RXQ_IDX(q)               (2 * (q) + 1)
   #define ENA_IO_TXQ_IDX_TO_COMBINED_IDX(q)       ((q) / 2)
   #define ENA_IO_RXQ_IDX_TO_COMBINED_IDX(q)       (((q) - 1) / 2)
   
   #define ENA_MGMNT_IRQ_IDX               0
   #define ENA_IO_IRQ_FIRST_IDX            1
   #define ENA_IO_IRQ_IDX(q)               (ENA_IO_IRQ_FIRST_IDX + (q))
   
   #define ENA_MAX_NO_INTERRUPT_ITERATIONS 3
   
   /*
    * ENA device should send keep alive msg every 1 sec.
    * We wait for 6 sec just to be on the safe side.
    */
   #define DEFAULT_KEEP_ALIVE_TO           (SBT_1S * 6)
   
   /* Time in jiffies before concluding the transmitter is hung. */
   #define DEFAULT_TX_CMP_TO               (SBT_1S * 5)
   
   /* Number of queues to check for missing queues per timer tick */
   #define DEFAULT_TX_MONITORED_QUEUES     (4)
   
   /* Max number of timeouted packets before device reset */
   #define DEFAULT_TX_CMP_THRESHOLD        (128)
   
   /*
    * Supported PCI vendor and devices IDs
    */
   #define PCI_VENDOR_ID_AMAZON    0x1d0f
   
   #define PCI_DEV_ID_ENA_PF               0x0ec2
   #define PCI_DEV_ID_ENA_PF_RSERV0        0x1ec2
   #define PCI_DEV_ID_ENA_VF               0xec20
   #define PCI_DEV_ID_ENA_VF_RSERV0        0xec21
   
   /*
    * Flags indicating current ENA driver state
    */
   enum ena_flags_t {
           ENA_FLAG_DEVICE_RUNNING,
           ENA_FLAG_DEV_UP,
           ENA_FLAG_LINK_UP,
           ENA_FLAG_MSIX_ENABLED,
           ENA_FLAG_TRIGGER_RESET,
           ENA_FLAG_ONGOING_RESET,
           ENA_FLAG_DEV_UP_BEFORE_RESET,
           ENA_FLAG_RSS_ACTIVE,
           ENA_FLAGS_NUMBER = ENA_FLAG_RSS_ACTIVE
   };
   
   BITSET_DEFINE(_ena_state, ENA_FLAGS_NUMBER);
   typedef struct _ena_state ena_state_t;
   
   #define ENA_FLAG_ZERO(adapter)          \
           BIT_ZERO(ENA_FLAGS_NUMBER, &(adapter)->flags)
   #define ENA_FLAG_ISSET(bit, adapter)    \
           BIT_ISSET(ENA_FLAGS_NUMBER, (bit), &(adapter)->flags)
   #define ENA_FLAG_SET_ATOMIC(bit, adapter)       \
           BIT_SET_ATOMIC(ENA_FLAGS_NUMBER, (bit), &(adapter)->flags)
   #define ENA_FLAG_CLEAR_ATOMIC(bit, adapter)     \
           BIT_CLR_ATOMIC(ENA_FLAGS_NUMBER, (bit), &(adapter)->flags)
   
   struct msix_entry {
           int entry;
           int vector;
   };
   
   typedef struct _ena_vendor_info_t {
           uint16_t vendor_id;
           uint16_t device_id;
           unsigned int index;
   } ena_vendor_info_t;
   
   struct ena_irq {
           /* Interrupt resources */
           struct resource *res;
           driver_filter_t *handler;
           void *data;
           void *cookie;
           unsigned int vector;
           bool requested;
   #ifdef RSS
           int cpu;
   #endif
           char name[ENA_IRQNAME_SIZE];
   };
   
   struct ena_que {
           struct ena_adapter *adapter;
           struct ena_ring *tx_ring;
           struct ena_ring *rx_ring;
   
           struct task cleanup_task;
           struct taskqueue *cleanup_tq;
   
           uint32_t id;
   #ifdef RSS
           int cpu;
           cpuset_t cpu_mask;
   #endif
           struct sysctl_oid *oid;
   };
   
   struct ena_calc_queue_size_ctx {
           struct ena_com_dev_get_features_ctx *get_feat_ctx;
           struct ena_com_dev *ena_dev;
           device_t pdev;
           uint32_t tx_queue_size;
           uint32_t rx_queue_size;
           uint32_t max_tx_queue_size;
           uint32_t max_rx_queue_size;
           uint16_t max_tx_sgl_size;
           uint16_t max_rx_sgl_size;
   };
   
   #ifdef DEV_NETMAP
   struct ena_netmap_tx_info {
           uint32_t socket_buf_idx[ENA_PKT_MAX_BUFS];
           bus_dmamap_t map_seg[ENA_PKT_MAX_BUFS];
           unsigned int sockets_used;
   };
   #endif
   
   struct ena_tx_buffer {
           struct mbuf *mbuf;
           /* # of ena desc for this specific mbuf
            * (includes data desc and metadata desc) */
           unsigned int tx_descs;
           /* # of buffers used by this mbuf */
           unsigned int num_of_bufs;
   
           bus_dmamap_t dmamap;
   
           /* Used to detect missing tx packets */
           struct bintime timestamp;
           bool print_once;
   
   #ifdef DEV_NETMAP
           struct ena_netmap_tx_info nm_info;
   #endif /* DEV_NETMAP */
   
           struct ena_com_buf bufs[ENA_PKT_MAX_BUFS];
   } __aligned(CACHE_LINE_SIZE);
   
   struct ena_rx_buffer {
           struct mbuf *mbuf;
           bus_dmamap_t map;
           struct ena_com_buf ena_buf;
   #ifdef DEV_NETMAP
           uint32_t netmap_buf_idx;
   #endif /* DEV_NETMAP */
   } __aligned(CACHE_LINE_SIZE);
   
   struct ena_stats_tx {
           counter_u64_t cnt;
           counter_u64_t bytes;
           counter_u64_t prepare_ctx_err;
           counter_u64_t dma_mapping_err;
           counter_u64_t doorbells;
           counter_u64_t missing_tx_comp;
           counter_u64_t bad_req_id;
           counter_u64_t collapse;
           counter_u64_t collapse_err;
           counter_u64_t queue_wakeup;
           counter_u64_t queue_stop;
           counter_u64_t llq_buffer_copy;
           counter_u64_t unmask_interrupt_num;
   };
   
   struct ena_stats_rx {
           counter_u64_t cnt;
           counter_u64_t bytes;
           counter_u64_t refil_partial;
           counter_u64_t csum_bad;
           counter_u64_t mjum_alloc_fail;
           counter_u64_t mbuf_alloc_fail;
           counter_u64_t dma_mapping_err;
           counter_u64_t bad_desc_num;
           counter_u64_t bad_req_id;
           counter_u64_t empty_rx_ring;
           counter_u64_t csum_good;
   };
   
   struct ena_ring {
           /* Holds the empty requests for TX/RX out of order completions */
           union {
                   uint16_t *free_tx_ids;
                   uint16_t *free_rx_ids;
           };
           struct ena_com_dev *ena_dev;
           struct ena_adapter *adapter;
           struct ena_com_io_cq *ena_com_io_cq;
           struct ena_com_io_sq *ena_com_io_sq;
   
           uint16_t qid;
   
           /* Determines if device will use LLQ or normal mode for TX */
           enum ena_admin_placement_policy_type tx_mem_queue_type;
           union {
                   /* The maximum length the driver can push to the device (For LLQ) */
                   uint8_t tx_max_header_size;
                   /* The maximum (and default) mbuf size for the Rx descriptor. */
                   uint16_t rx_mbuf_sz;
   
           };
   
           bool first_interrupt;
           uint16_t no_interrupt_event_cnt;
   
           struct ena_com_rx_buf_info ena_bufs[ENA_PKT_MAX_BUFS];
   
           struct ena_que *que;
           struct lro_ctrl lro;
   
           uint16_t next_to_use;
           uint16_t next_to_clean;
   
           union {
                   struct ena_tx_buffer *tx_buffer_info; /* contex of tx packet */
                   struct ena_rx_buffer *rx_buffer_info; /* contex of rx packet */
           };
           int ring_size; /* number of tx/rx_buffer_info's entries */
   
           struct buf_ring *br; /* only for TX */
           uint32_t buf_ring_size;
   
           struct mtx ring_mtx;
           char mtx_name[16];
   
           struct {
                   struct task enqueue_task;
                   struct taskqueue *enqueue_tq;
           };
   
           union {
                   struct ena_stats_tx tx_stats;
                   struct ena_stats_rx rx_stats;
           };
   
           union {
                   int empty_rx_queue;
                   /* For Tx ring to indicate if it's running or not */
                   bool running;
           };
   
           /* How many packets are sent in one Tx loop, used for doorbells */
           uint32_t acum_pkts;
   
           /* Used for LLQ */
           uint8_t *push_buf_intermediate_buf;
   
   #ifdef DEV_NETMAP
           bool initialized;
   #endif /* DEV_NETMAP */
   } __aligned(CACHE_LINE_SIZE);
   
   struct ena_stats_dev {
           counter_u64_t wd_expired;
           counter_u64_t interface_up;
           counter_u64_t interface_down;
           counter_u64_t admin_q_pause;
   };
   
   struct ena_hw_stats {
           counter_u64_t rx_packets;
           counter_u64_t tx_packets;
   
           counter_u64_t rx_bytes;
           counter_u64_t tx_bytes;
   
           counter_u64_t rx_drops;
           counter_u64_t tx_drops;
   };
   
   /* Board specific private data structure */
   struct ena_adapter {
           struct ena_com_dev *ena_dev;
   
           /* OS defined structs */
           if_t ifp;
           device_t pdev;
           struct ifmedia  media;
   
           /* OS resources */
           struct resource *memory;
           struct resource *registers;
           struct resource *msix;
           int msix_rid;
   
           /* MSI-X */
           struct msix_entry *msix_entries;
           int msix_vecs;
   
           /* DMA tags used throughout the driver adapter for Tx and Rx */
           bus_dma_tag_t tx_buf_tag;
           bus_dma_tag_t rx_buf_tag;
           int dma_width;
   
           uint32_t max_mtu;
   
           uint32_t num_io_queues;
           uint32_t max_num_io_queues;
   
           uint32_t requested_tx_ring_size;
           uint32_t requested_rx_ring_size;
   
           uint32_t max_tx_ring_size;
           uint32_t max_rx_ring_size;
   
           uint16_t max_tx_sgl_size;
           uint16_t max_rx_sgl_size;
   
           uint32_t tx_offload_cap;
   
           uint32_t buf_ring_size;
   
           /* RSS*/
           struct ena_indir *rss_indir;
   
           uint8_t mac_addr[ETHER_ADDR_LEN];
           /* mdio and phy*/
   
           ena_state_t flags;
   
           /* Queue will represent one TX and one RX ring */
           struct ena_que que[ENA_MAX_NUM_IO_QUEUES]
               __aligned(CACHE_LINE_SIZE);
   
           /* TX */
           struct ena_ring tx_ring[ENA_MAX_NUM_IO_QUEUES]
               __aligned(CACHE_LINE_SIZE);
   
           /* RX */
           struct ena_ring rx_ring[ENA_MAX_NUM_IO_QUEUES]
               __aligned(CACHE_LINE_SIZE);
   
           struct ena_irq irq_tbl[ENA_MAX_MSIX_VEC(ENA_MAX_NUM_IO_QUEUES)];
   
           /* Timer service */
           struct callout timer_service;
           sbintime_t keep_alive_timestamp;
           uint32_t next_monitored_tx_qid;
           struct task reset_task;
           struct taskqueue *reset_tq;
           int wd_active;
           sbintime_t keep_alive_timeout;
           sbintime_t missing_tx_timeout;
           uint32_t missing_tx_max_queues;
           uint32_t missing_tx_threshold;
           bool disable_meta_caching;
   
           uint16_t eni_metrics_sample_interval;
           uint16_t eni_metrics_sample_interval_cnt;
   
           /* Statistics */
           struct ena_stats_dev dev_stats;
           struct ena_hw_stats hw_stats;
           struct ena_admin_eni_stats eni_metrics;
   
           enum ena_regs_reset_reason_types reset_reason;
   };
   
   #define ENA_RING_MTX_LOCK(_ring)                mtx_lock(&(_ring)->ring_mtx)
   #define ENA_RING_MTX_TRYLOCK(_ring)             mtx_trylock(&(_ring)->ring_mtx)
   #define ENA_RING_MTX_UNLOCK(_ring)              mtx_unlock(&(_ring)->ring_mtx)
   #define ENA_RING_MTX_ASSERT(_ring)              \
           mtx_assert(&(_ring)->ring_mtx, MA_OWNED)
   
   #define ENA_LOCK_INIT()                                 \
           sx_init(&ena_global_lock,       "ENA global lock")
   #define ENA_LOCK_DESTROY()              sx_destroy(&ena_global_lock)
   #define ENA_LOCK_LOCK()                 sx_xlock(&ena_global_lock)
   #define ENA_LOCK_UNLOCK()               sx_unlock(&ena_global_lock)
   #define ENA_LOCK_ASSERT()               sx_assert(&ena_global_lock, SA_XLOCKED)
   
   #define clamp_t(type, _x, min, max)     min_t(type, max_t(type, _x, min), max)
   #define clamp_val(val, lo, hi)          clamp_t(__typeof(val), val, lo, hi)
   
   extern struct sx ena_global_lock;
   
   static inline int ena_mbuf_count(struct mbuf *mbuf)
   {
           int count = 1;
   
           while ((mbuf = mbuf->m_next) != NULL)
                   ++count;
   
           return count;
   }
   
   int     ena_up(struct ena_adapter *adapter);
   void    ena_down(struct ena_adapter *adapter);
   int     ena_restore_device(struct ena_adapter *adapter);
   void    ena_destroy_device(struct ena_adapter *adapter, bool graceful);
   int     ena_refill_rx_bufs(struct ena_ring *rx_ring, uint32_t num);
   int     ena_update_buf_ring_size(struct ena_adapter *adapter,
       uint32_t new_buf_ring_size);
   int     ena_update_queue_size(struct ena_adapter *adapter, uint32_t new_tx_size,
       uint32_t new_rx_size);
   int     ena_update_io_queue_nb(struct ena_adapter *adapter, uint32_t new_num);
   
   static inline void
   ena_trigger_reset(struct ena_adapter *adapter,
       enum ena_regs_reset_reason_types reset_reason)
   {
           if (likely(!ENA_FLAG_ISSET(ENA_FLAG_TRIGGER_RESET, adapter))) {
                   adapter->reset_reason = reset_reason;
                   ENA_FLAG_SET_ATOMIC(ENA_FLAG_TRIGGER_RESET, adapter);
           }
   }
   
   #endif /* !(ENA_H) */

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