diff options
Diffstat (limited to 'drivers/infiniband/ulp/isert/ib_isert.h')
| -rw-r--r-- | drivers/infiniband/ulp/isert/ib_isert.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h new file mode 100644 index 000000000..3b296bac4 --- /dev/null +++ b/drivers/infiniband/ulp/isert/ib_isert.h @@ -0,0 +1,201 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <rdma/ib_verbs.h> +#include <rdma/rdma_cm.h> +#include <rdma/rw.h> +#include <scsi/iser.h> + + +#define DRV_NAME "isert" +#define PFX DRV_NAME ": " + +#define isert_dbg(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 2)) \ + printk(KERN_DEBUG PFX "%s: " fmt,\ + __func__ , ## arg); \ + } while (0) + +#define isert_warn(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 0)) \ + pr_warn(PFX "%s: " fmt, \ + __func__ , ## arg); \ + } while (0) + +#define isert_info(fmt, arg...) \ + do { \ + if (unlikely(isert_debug_level > 1)) \ + pr_info(PFX "%s: " fmt, \ + __func__ , ## arg); \ + } while (0) + +#define isert_err(fmt, arg...) \ + pr_err(PFX "%s: " fmt, __func__ , ## arg) + +/* Constant PDU lengths calculations */ +#define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + \ + sizeof(struct iscsi_hdr)) +#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) + +/* QP settings */ +/* Maximal bounds on received asynchronous PDUs */ +#define ISERT_MAX_TX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ + +#define ISERT_MAX_RX_MISC_PDUS 6 /* + * NOOP_OUT(2), TEXT(1), + * SCSI_TMFUNC(2), LOGOUT(1) + */ + +#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */ + +#define ISERT_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX) + +#define ISERT_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2) + +#define ISERT_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \ + ISERT_MAX_TX_MISC_PDUS + \ + ISERT_MAX_RX_MISC_PDUS) + +#define ISER_RX_PAD_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 4096 - \ + (ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge) + \ + sizeof(struct ib_cqe) + sizeof(bool))) + +#define ISCSI_ISER_SG_TABLESIZE 256 + +enum isert_desc_type { + ISCSI_TX_CONTROL, + ISCSI_TX_DATAIN +}; + +enum iser_conn_state { + ISER_CONN_INIT, + ISER_CONN_UP, + ISER_CONN_BOUND, + ISER_CONN_FULL_FEATURE, + ISER_CONN_TERMINATING, + ISER_CONN_DOWN, +}; + +struct iser_rx_desc { + struct iser_ctrl iser_header; + struct iscsi_hdr iscsi_header; + char data[ISCSI_DEF_MAX_RECV_SEG_LEN]; + u64 dma_addr; + struct ib_sge rx_sg; + struct ib_cqe rx_cqe; + bool in_use; + char pad[ISER_RX_PAD_SIZE]; +} __packed; + +static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe) +{ + return container_of(cqe, struct iser_rx_desc, rx_cqe); +} + +struct iser_tx_desc { + struct iser_ctrl iser_header; + struct iscsi_hdr iscsi_header; + enum isert_desc_type type; + u64 dma_addr; + struct ib_sge tx_sg[2]; + struct ib_cqe tx_cqe; + int num_sge; + struct ib_send_wr send_wr; +} __packed; + +static inline struct iser_tx_desc *cqe_to_tx_desc(struct ib_cqe *cqe) +{ + return container_of(cqe, struct iser_tx_desc, tx_cqe); +} + +struct isert_cmd { + uint32_t read_stag; + uint32_t write_stag; + uint64_t read_va; + uint64_t write_va; + uint32_t inv_rkey; + u64 pdu_buf_dma; + u32 pdu_buf_len; + struct isert_conn *conn; + struct iscsi_cmd *iscsi_cmd; + struct iser_tx_desc tx_desc; + struct iser_rx_desc *rx_desc; + struct rdma_rw_ctx rw; + struct work_struct comp_work; + struct scatterlist sg; + bool ctx_init_done; +}; + +static inline struct isert_cmd *tx_desc_to_cmd(struct iser_tx_desc *desc) +{ + return container_of(desc, struct isert_cmd, tx_desc); +} + +struct isert_device; + +struct isert_conn { + enum iser_conn_state state; + u32 responder_resources; + u32 initiator_depth; + bool pi_support; + struct iser_rx_desc *login_req_buf; + char *login_rsp_buf; + u64 login_req_dma; + int login_req_len; + u64 login_rsp_dma; + struct iser_rx_desc *rx_descs; + struct ib_recv_wr rx_wr[ISERT_QP_MAX_RECV_DTOS]; + struct iscsi_conn *conn; + struct list_head node; + struct completion login_comp; + struct completion login_req_comp; + struct iser_tx_desc login_tx_desc; + struct rdma_cm_id *cm_id; + struct ib_qp *qp; + struct isert_device *device; + struct mutex mutex; + struct kref kref; + struct work_struct release_work; + bool logout_posted; + bool snd_w_inv; + wait_queue_head_t rem_wait; + bool dev_removed; +}; + +#define ISERT_MAX_CQ 64 + +/** + * struct isert_comp - iSER completion context + * + * @device: pointer to device handle + * @cq: completion queue + * @active_qps: Number of active QPs attached + * to completion context + */ +struct isert_comp { + struct isert_device *device; + struct ib_cq *cq; + int active_qps; +}; + +struct isert_device { + bool pi_capable; + int refcount; + struct ib_device *ib_device; + struct ib_pd *pd; + struct isert_comp *comps; + int comps_used; + struct list_head dev_node; +}; + +struct isert_np { + struct iscsi_np *np; + struct semaphore sem; + struct rdma_cm_id *cm_id; + struct mutex mutex; + struct list_head accepted; + struct list_head pending; +}; |