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 #define ISER_FASTREG_LI_WRID            0xffffffffffffffffULL
  10
  11 enum isert_desc_type {
  12         ISCSI_TX_CONTROL,
  13         ISCSI_TX_DATAIN
  14 };
  15
  16 enum iser_ib_op_code {
  17         ISER_IB_RECV,
  18         ISER_IB_SEND,
  19         ISER_IB_RDMA_WRITE,
  20         ISER_IB_RDMA_READ,
  21 };
  22
  23 enum iser_conn_state {
  24         ISER_CONN_INIT,
  25         ISER_CONN_UP,
  26         ISER_CONN_TERMINATING,
  27         ISER_CONN_DOWN,
  28 };
  29
  30 struct iser_rx_desc {
  31         struct iser_hdr iser_header;
  32         struct iscsi_hdr iscsi_header;
  33         char            data[ISER_RECV_DATA_SEG_LEN];
  34         u64             dma_addr;
  35         struct ib_sge   rx_sg;
  36         char            pad[ISER_RX_PAD_SIZE];
  37 } __packed;
  38
  39 struct iser_tx_desc {
  40         struct iser_hdr iser_header;
  41         struct iscsi_hdr iscsi_header;
  42         enum isert_desc_type type;
  43         u64             dma_addr;
  44         struct ib_sge   tx_sg[2];
  45         int             num_sge;
  46         struct isert_cmd *isert_cmd;
  47         struct llist_node *comp_llnode_batch;
  48         struct llist_node comp_llnode;
  49         bool            llnode_active;
  50         struct ib_send_wr send_wr;
  51 } __packed;
  52
  53 struct fast_reg_descriptor {
  54         struct list_head        list;
  55         struct ib_mr            *data_mr;
  56         struct ib_fast_reg_page_list    *data_frpl;
  57         bool                    valid;
  58 };
  59
  60 struct isert_rdma_wr {
  61         struct list_head        wr_list;
  62         struct isert_cmd        *isert_cmd;
  63         enum iser_ib_op_code    iser_ib_op;
  64         struct ib_sge           *ib_sge;
  65         struct ib_sge           s_ib_sge;
  66         int                     num_sge;
  67         struct scatterlist      *sge;
  68         int                     send_wr_num;
  69         struct ib_send_wr       *send_wr;
  70         struct ib_send_wr       s_send_wr;
  71         u32                     cur_rdma_length;
  72         struct fast_reg_descriptor *fr_desc;
  73 };
  74
  75 struct isert_cmd {
  76         uint32_t                read_stag;
  77         uint32_t                write_stag;
  78         uint64_t                read_va;
  79         uint64_t                write_va;
  80         u64                     pdu_buf_dma;
  81         u32                     pdu_buf_len;
  82         u32                     read_va_off;
  83         u32                     write_va_off;
  84         u32                     rdma_wr_num;
  85         struct isert_conn       *conn;
  86         struct iscsi_cmd        *iscsi_cmd;
  87         struct iser_tx_desc     tx_desc;
  88         struct isert_rdma_wr    rdma_wr;
  89         struct work_struct      comp_work;
  90 };
  91
  92 struct isert_device;
  93
  94 struct isert_conn {
  95         enum iser_conn_state    state;
  96         bool                    logout_posted;
  97         int                     post_recv_buf_count;
  98         atomic_t                post_send_buf_count;
  99         u32                     responder_resources;
 100         u32                     initiator_depth;
 101         u32                     max_sge;
 102         char                    *login_buf;
 103         char                    *login_req_buf;
 104         char                    *login_rsp_buf;
 105         u64                     login_req_dma;
 106         u64                     login_rsp_dma;
 107         unsigned int            conn_rx_desc_head;
 108         struct iser_rx_desc     *conn_rx_descs;
 109         struct ib_recv_wr       conn_rx_wr[ISERT_MIN_POSTED_RX];
 110         struct iscsi_conn       *conn;
 111         struct list_head        conn_accept_node;
 112         struct completion       conn_login_comp;
 113         struct iser_tx_desc     conn_login_tx_desc;
 114         struct rdma_cm_id       *conn_cm_id;
 115         struct ib_pd            *conn_pd;
 116         struct ib_mr            *conn_mr;
 117         struct ib_qp            *conn_qp;
 118         struct isert_device     *conn_device;
 119         struct work_struct      conn_logout_work;
 120         struct mutex            conn_mutex;
 121         struct completion       conn_wait;
 122         struct completion       conn_wait_comp_err;
 123         struct kref             conn_kref;
 124         struct list_head        conn_fr_pool;
 125         int                     conn_fr_pool_size;
 126         /* lock to protect fastreg pool */
 127         spinlock_t              conn_lock;
 128 #define ISERT_COMP_BATCH_COUNT  8
 129         int                     conn_comp_batch;
 130         struct llist_head       conn_comp_llist;
 131 };
 132
 133 #define ISERT_MAX_CQ 64
 134
 135 struct isert_cq_desc {
 136         struct isert_device     *device;
 137         int                     cq_index;
 138         struct work_struct      cq_rx_work;
 139         struct work_struct      cq_tx_work;
 140 };
 141
 142 struct isert_device {
 143         int                     use_fastreg;
 144         int                     cqs_used;
 145         int                     refcount;
 146         int                     cq_active_qps[ISERT_MAX_CQ];
 147         struct ib_device        *ib_device;
 148         struct ib_cq            *dev_rx_cq[ISERT_MAX_CQ];
 149         struct ib_cq            *dev_tx_cq[ISERT_MAX_CQ];
 150         struct isert_cq_desc    *cq_desc;
 151         struct list_head        dev_node;
 152         struct ib_device_attr   dev_attr;
 153         int                     (*reg_rdma_mem)(struct iscsi_conn *conn,
 154                                                     struct iscsi_cmd *cmd,
 155                                                     struct isert_rdma_wr *wr);
 156         void                    (*unreg_rdma_mem)(struct isert_cmd *isert_cmd,
 157                                                   struct isert_conn *isert_conn);
 158 };
 159
 160 struct isert_np {
 161         wait_queue_head_t       np_accept_wq;
 162         struct rdma_cm_id       *np_cm_id;
 163         struct mutex            np_accept_mutex;
 164         struct list_head        np_accept_list;
 165         struct completion       np_login_comp;
 166 };