drivers/infiniband/ulp/isert/ib_isert.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <linux/socket.h>
   3 #include <linux/in.h>
   4 #include <linux/in6.h>
   5 #include <rdma/ib_verbs.h>
   6 #include <rdma/rdma_cm.h>
   7 #include <rdma/rw.h>
   8 #include <scsi/iser.h>
   9
  10
  11 #define DRV_NAME        "isert"
  12 #define PFX             DRV_NAME ": "
  13
  14 #define isert_dbg(fmt, arg...)                           \
  15         do {                                             \
  16                 if (unlikely(isert_debug_level > 2))     \
  17                         printk(KERN_DEBUG PFX "%s: " fmt,\
  18                                 __func__ , ## arg);      \
  19         } while (0)
  20
  21 #define isert_warn(fmt, arg...)                         \
  22         do {                                            \
  23                 if (unlikely(isert_debug_level > 0))    \
  24                         pr_warn(PFX "%s: " fmt,         \
  25                                 __func__ , ## arg);     \
  26         } while (0)
  27
  28 #define isert_info(fmt, arg...)                         \
  29         do {                                            \
  30                 if (unlikely(isert_debug_level > 1))    \
  31                         pr_info(PFX "%s: " fmt,         \
  32                                 __func__ , ## arg);     \
  33         } while (0)
  34
  35 #define isert_err(fmt, arg...) \
  36         pr_err(PFX "%s: " fmt, __func__ , ## arg)
  37
  38 /* Constant PDU lengths calculations */
  39 #define ISER_HEADERS_LEN        (sizeof(struct iser_ctrl) + \
  40                                  sizeof(struct iscsi_hdr))
  41 #define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
  42
  43 /* QP settings */
  44 /* Maximal bounds on received asynchronous PDUs */
  45 #define ISERT_MAX_TX_MISC_PDUS  4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
  46
  47 #define ISERT_MAX_RX_MISC_PDUS  6 /*
  48                                    * NOOP_OUT(2), TEXT(1),
  49                                    * SCSI_TMFUNC(2), LOGOUT(1)
  50                                    */
  51
  52 #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */
  53
  54 #define ISERT_QP_MAX_RECV_DTOS  (ISCSI_DEF_XMIT_CMDS_MAX)
  55
  56 #define ISERT_MIN_POSTED_RX     (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
  57
  58 #define ISERT_QP_MAX_REQ_DTOS   (ISCSI_DEF_XMIT_CMDS_MAX +    \
  59                                 ISERT_MAX_TX_MISC_PDUS  + \
  60                                 ISERT_MAX_RX_MISC_PDUS)
  61
  62 #define ISER_RX_PAD_SIZE        (ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \
  63                 (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \
  64                  sizeof(struct ib_cqe) + sizeof(bool)))
  65
  66 #define ISCSI_ISER_SG_TABLESIZE         256
  67
  68 enum isert_desc_type {
  69         ISCSI_TX_CONTROL,
  70         ISCSI_TX_DATAIN
  71 };
  72
  73 enum iser_conn_state {
  74         ISER_CONN_INIT,
  75         ISER_CONN_UP,
  76         ISER_CONN_BOUND,
  77         ISER_CONN_FULL_FEATURE,
  78         ISER_CONN_TERMINATING,
  79         ISER_CONN_DOWN,
  80 };
  81
  82 struct iser_rx_desc {
  83         struct iser_ctrl iser_header;
  84         struct iscsi_hdr iscsi_header;
  85         char            data[ISCSI_DEF_MAX_RECV_SEG_LEN];
  86         u64             dma_addr;
  87         struct ib_sge   rx_sg;
  88         struct ib_cqe   rx_cqe;
  89         bool            in_use;
  90         char            pad[ISER_RX_PAD_SIZE];
  91 } __packed;
  92
  93 static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
  94 {
  95         return container_of(cqe, struct iser_rx_desc, rx_cqe);
  96 }
  97
  98 struct iser_tx_desc {
  99         struct iser_ctrl iser_header;
 100         struct iscsi_hdr iscsi_header;
 101         enum isert_desc_type type;
 102         u64             dma_addr;
 103         struct ib_sge   tx_sg[2];
 104         struct ib_cqe   tx_cqe;
 105         int             num_sge;
 106         struct ib_send_wr send_wr;
 107 } __packed;
 108
 109 static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe)
 110 {
 111         return container_of(cqe, struct iser_tx_desc, tx_cqe);
 112 }
 113
 114 struct isert_cmd {
 115         uint32_t                read_stag;
 116         uint32_t                write_stag;
 117         uint64_t                read_va;
 118         uint64_t                write_va;
 119         uint32_t                inv_rkey;
 120         u64                     pdu_buf_dma;
 121         u32                     pdu_buf_len;
 122         struct isert_conn       *conn;
 123         struct iscsi_cmd        *iscsi_cmd;
 124         struct iser_tx_desc     tx_desc;
 125         struct iser_rx_desc     *rx_desc;
 126         struct rdma_rw_ctx      rw;
 127         struct work_struct      comp_work;
 128         struct scatterlist      sg;
 129 };
 130
 131 static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc)
 132 {
 133         return container_of(desc, struct isert_cmd, tx_desc);
 134 }
 135
 136 struct isert_device;
 137
 138 struct isert_conn {
 139         enum iser_conn_state    state;
 140         u32                     responder_resources;
 141         u32                     initiator_depth;
 142         bool                    pi_support;
 143         struct iser_rx_desc     *login_req_buf;
 144         char                    *login_rsp_buf;
 145         u64                     login_req_dma;
 146         int                     login_req_len;
 147         u64                     login_rsp_dma;
 148         struct iser_rx_desc     *rx_descs;
 149         struct ib_recv_wr       rx_wr[ISERT_QP_MAX_RECV_DTOS];
 150         struct iscsi_conn       *conn;
 151         struct list_head        node;
 152         struct completion       login_comp;
 153         struct completion       login_req_comp;
 154         struct iser_tx_desc     login_tx_desc;
 155         struct rdma_cm_id       *cm_id;
 156         struct ib_qp            *qp;
 157         struct isert_device     *device;
 158         struct mutex            mutex;
 159         struct kref             kref;
 160         struct work_struct      release_work;
 161         bool                    logout_posted;
 162         bool                    snd_w_inv;
 163         wait_queue_head_t       rem_wait;
 164         bool                    dev_removed;
 165 };
 166
 167 #define ISERT_MAX_CQ 64
 168
 169 /**
 170  * struct isert_comp - iSER completion context
 171  *
 172  * @device:     pointer to device handle
 173  * @cq:         completion queue
 174  * @active_qps: Number of active QPs attached
 175  *              to completion context
 176  */
 177 struct isert_comp {
 178         struct isert_device     *device;
 179         struct ib_cq            *cq;
 180         int                      active_qps;
 181 };
 182
 183 struct isert_device {
 184         bool                    pi_capable;
 185         int                     refcount;
 186         struct ib_device        *ib_device;
 187         struct ib_pd            *pd;
 188         struct isert_comp       *comps;
 189         int                     comps_used;
 190         struct list_head        dev_node;
 191 };
 192
 193 struct isert_np {
 194         struct iscsi_np         *np;
 195         struct semaphore        sem;
 196         struct rdma_cm_id       *cm_id;
 197         struct mutex            mutex;
 198         struct list_head        accepted;
 199         struct list_head        pending;
 200 };