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 llist_node *comp_llnode_batch;
  47         struct llist_node comp_llnode;
  48         struct ib_send_wr send_wr;
  49 } __packed;
  50
  51 struct fast_reg_descriptor {
  52         struct list_head        list;
  53         struct ib_mr            *data_mr;
  54         struct ib_fast_reg_page_list    *data_frpl;
  55         bool                    valid;
  56 };
  57
  58 struct isert_rdma_wr {
  59         struct list_head        wr_list;
  60         struct isert_cmd        *isert_cmd;
  61         enum iser_ib_op_code    iser_ib_op;
  62         struct ib_sge           *ib_sge;
  63         struct ib_sge           s_ib_sge;
  64         int                     num_sge;
  65         struct scatterlist      *sge;
  66         int                     send_wr_num;
  67         struct ib_send_wr       *send_wr;
  68         struct ib_send_wr       s_send_wr;
  69         u32                     cur_rdma_length;
  70         struct fast_reg_descriptor *fr_desc;
  71 };
  72
  73 struct isert_cmd {
  74         uint32_t                read_stag;
  75         uint32_t                write_stag;
  76         uint64_t                read_va;
  77         uint64_t                write_va;
  78         u64                     pdu_buf_dma;
  79         u32                     pdu_buf_len;
  80         u32                     read_va_off;
  81         u32                     write_va_off;
  82         u32                     rdma_wr_num;
  83         struct isert_conn       *conn;
  84         struct iscsi_cmd        *iscsi_cmd;
  85         struct iser_tx_desc     tx_desc;
  86         struct isert_rdma_wr    rdma_wr;
  87         struct work_struct      comp_work;
  88 };
  89
  90 struct isert_device;
  91
  92 struct isert_conn {
  93         enum iser_conn_state    state;
  94         bool                    logout_posted;
  95         int                     post_recv_buf_count;
  96         atomic_t                post_send_buf_count;
  97         u32                     responder_resources;
  98         u32                     initiator_depth;
  99         u32                     max_sge;
 100         char                    *login_buf;
 101         char                    *login_req_buf;
 102         char                    *login_rsp_buf;
 103         u64                     login_req_dma;
 104         u64                     login_rsp_dma;
 105         unsigned int            conn_rx_desc_head;
 106         struct iser_rx_desc     *conn_rx_descs;
 107         struct ib_recv_wr       conn_rx_wr[ISERT_MIN_POSTED_RX];
 108         struct iscsi_conn       *conn;
 109         struct list_head        conn_accept_node;
 110         struct completion       conn_login_comp;
 111         struct iser_tx_desc     conn_login_tx_desc;
 112         struct rdma_cm_id       *conn_cm_id;
 113         struct ib_pd            *conn_pd;
 114         struct ib_mr            *conn_mr;
 115         struct ib_qp            *conn_qp;
 116         struct isert_device     *conn_device;
 117         struct work_struct      conn_logout_work;
 118         struct mutex            conn_mutex;
 119         wait_queue_head_t       conn_wait;
 120         wait_queue_head_t       conn_wait_comp_err;
 121         struct kref             conn_kref;
 122         struct list_head        conn_frwr_pool;
 123         int                     conn_frwr_pool_size;
 124         /* lock to protect frwr_pool */
 125         spinlock_t              conn_lock;
 126 #define ISERT_COMP_BATCH_COUNT  8
 127         int                     conn_comp_batch;
 128         struct llist_head       conn_comp_llist;
 129         struct mutex            conn_comp_mutex;
 130 };
 131
 132 #define ISERT_MAX_CQ 64
 133
 134 struct isert_cq_desc {
 135         struct isert_device     *device;
 136         int                     cq_index;
 137         struct work_struct      cq_rx_work;
 138         struct work_struct      cq_tx_work;
 139 };
 140
 141 struct isert_device {
 142         int                     use_frwr;
 143         int                     cqs_used;
 144         int                     refcount;
 145         int                     cq_active_qps[ISERT_MAX_CQ];
 146         struct ib_device        *ib_device;
 147         struct ib_pd            *dev_pd;
 148         struct ib_mr            *dev_mr;
 149         struct ib_cq            *dev_rx_cq[ISERT_MAX_CQ];
 150         struct ib_cq            *dev_tx_cq[ISERT_MAX_CQ];
 151         struct isert_cq_desc    *cq_desc;
 152         struct list_head        dev_node;
 153         struct ib_device_attr   dev_attr;
 154         int                     (*reg_rdma_mem)(struct iscsi_conn *conn,
 155                                                     struct iscsi_cmd *cmd,
 156                                                     struct isert_rdma_wr *wr);
 157         void                    (*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
 158                                                   struct isert_conn *isert_conn);
 159 };
 160
 161 struct isert_np {
 162         wait_queue_head_t       np_accept_wq;
 163         struct rdma_cm_id       *np_cm_id;
 164         struct mutex            np_accept_mutex;
 165         struct list_head        np_accept_list;
 166         struct completion       np_login_comp;
 167 };