drivers/infiniband/ulp/isert/ib_isert.h

   1 #include <linux/socket.h>
   2 #include <linux/in.h>
   3 #include <linux/in6.h>
   4 #include <rdma/ib_verbs.h>
   5 #include <rdma/rdma_cm.h>
   6
   7 #define ISERT_RDMA_LISTEN_BACKLOG       10
   8 #define ISCSI_ISER_SG_TABLESIZE         256
   9
  10 enum isert_desc_type {
  11         ISCSI_TX_CONTROL,
  12         ISCSI_TX_DATAIN
  13 };
  14
  15 enum iser_ib_op_code {
  16         ISER_IB_RECV,
  17         ISER_IB_SEND,
  18         ISER_IB_RDMA_WRITE,
  19         ISER_IB_RDMA_READ,
  20 };
  21
  22 enum iser_conn_state {
  23         ISER_CONN_INIT,
  24         ISER_CONN_UP,
  25         ISER_CONN_TERMINATING,
  26         ISER_CONN_DOWN,
  27 };
  28
  29 struct iser_rx_desc {
  30         struct iser_hdr iser_header;
  31         struct iscsi_hdr iscsi_header;
  32         char            data[ISER_RECV_DATA_SEG_LEN];
  33         u64             dma_addr;
  34         struct ib_sge   rx_sg;
  35         char            pad[ISER_RX_PAD_SIZE];
  36 } __packed;
  37
  38 struct iser_tx_desc {
  39         struct iser_hdr iser_header;
  40         struct iscsi_hdr iscsi_header;
  41         enum isert_desc_type type;
  42         u64             dma_addr;
  43         struct ib_sge   tx_sg[2];
  44         int             num_sge;
  45         struct isert_cmd *isert_cmd;
  46         struct ib_send_wr send_wr;
  47 } __packed;
  48
  49 struct fast_reg_descriptor {
  50         struct list_head        list;
  51         struct ib_mr            *data_mr;
  52         struct ib_fast_reg_page_list    *data_frpl;
  53         bool                    valid;
  54 };
  55
  56 struct isert_rdma_wr {
  57         struct list_head        wr_list;
  58         struct isert_cmd        *isert_cmd;
  59         enum iser_ib_op_code    iser_ib_op;
  60         struct ib_sge           *ib_sge;
  61         struct ib_sge           s_ib_sge;
  62         int                     num_sge;
  63         struct scatterlist      *sge;
  64         int                     send_wr_num;
  65         struct ib_send_wr       *send_wr;
  66         struct ib_send_wr       s_send_wr;
  67         u32                     cur_rdma_length;
  68         struct fast_reg_descriptor *fr_desc;
  69 };
  70
  71 struct isert_cmd {
  72         uint32_t                read_stag;
  73         uint32_t                write_stag;
  74         uint64_t                read_va;
  75         uint64_t                write_va;
  76         u64                     pdu_buf_dma;
  77         u32                     pdu_buf_len;
  78         u32                     read_va_off;
  79         u32                     write_va_off;
  80         u32                     rdma_wr_num;
  81         struct isert_conn       *conn;
  82         struct iscsi_cmd        *iscsi_cmd;
  83         struct iser_tx_desc     tx_desc;
  84         struct isert_rdma_wr    rdma_wr;
  85         struct work_struct      comp_work;
  86 };
  87
  88 struct isert_device;
  89
  90 struct isert_conn {
  91         enum iser_conn_state    state;
  92         bool                    logout_posted;
  93         int                     post_recv_buf_count;
  94         atomic_t                post_send_buf_count;
  95         u32                     responder_resources;
  96         u32                     initiator_depth;
  97         u32                     max_sge;
  98         char                    *login_buf;
  99         char                    *login_req_buf;
 100         char                    *login_rsp_buf;
 101         u64                     login_req_dma;
 102         u64                     login_rsp_dma;
 103         unsigned int            conn_rx_desc_head;
 104         struct iser_rx_desc     *conn_rx_descs;
 105         struct ib_recv_wr       conn_rx_wr[ISERT_MIN_POSTED_RX];
 106         struct iscsi_conn       *conn;
 107         struct list_head        conn_accept_node;
 108         struct completion       conn_login_comp;
 109         struct iser_tx_desc     conn_login_tx_desc;
 110         struct rdma_cm_id       *conn_cm_id;
 111         struct ib_pd            *conn_pd;
 112         struct ib_mr            *conn_mr;
 113         struct ib_qp            *conn_qp;
 114         struct isert_device     *conn_device;
 115         struct work_struct      conn_logout_work;
 116         struct mutex            conn_mutex;
 117         wait_queue_head_t       conn_wait;
 118         wait_queue_head_t       conn_wait_comp_err;
 119         struct kref             conn_kref;
 120         struct list_head        conn_frwr_pool;
 121         int                     conn_frwr_pool_size;
 122         /* lock to protect frwr_pool */
 123         spinlock_t              conn_lock;
 124 };
 125
 126 #define ISERT_MAX_CQ 64
 127
 128 struct isert_cq_desc {
 129         struct isert_device     *device;
 130         int                     cq_index;
 131         struct work_struct      cq_rx_work;
 132         struct work_struct      cq_tx_work;
 133 };
 134
 135 struct isert_device {
 136         int                     use_frwr;
 137         int                     cqs_used;
 138         int                     refcount;
 139         int                     cq_active_qps[ISERT_MAX_CQ];
 140         struct ib_device        *ib_device;
 141         struct ib_pd            *dev_pd;
 142         struct ib_mr            *dev_mr;
 143         struct ib_cq            *dev_rx_cq[ISERT_MAX_CQ];
 144         struct ib_cq            *dev_tx_cq[ISERT_MAX_CQ];
 145         struct isert_cq_desc    *cq_desc;
 146         struct list_head        dev_node;
 147         struct ib_device_attr   dev_attr;
 148         int                     (*reg_rdma_mem)(struct iscsi_conn *conn,
 149                                                     struct iscsi_cmd *cmd,
 150                                                     struct isert_rdma_wr *wr);
 151         void                    (*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
 152                                                   struct isert_conn *isert_conn);
 153 };
 154
 155 struct isert_np {
 156         wait_queue_head_t       np_accept_wq;
 157         struct rdma_cm_id       *np_cm_id;
 158         struct mutex            np_accept_mutex;
 159         struct list_head        np_accept_list;
 160         struct completion       np_login_comp;
 161 };