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/* 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)
/*
* RX size is default of 8k plus headers, but data needs to align to
* 512 boundary, so use 1024 to have the extra space for alignment.
*/
#define ISER_RX_SIZE (ISCSI_DEF_MAX_RECV_SEG_LEN + 1024)
#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 {
char buf[ISER_RX_SIZE];
u64 dma_addr;
struct ib_sge rx_sg;
struct ib_cqe rx_cqe;
bool in_use;
};
static inline struct iser_rx_desc *cqe_to_rx_desc(struct ib_cqe *cqe)
{
return container_of(cqe, struct iser_rx_desc, rx_cqe);
}
static void *isert_get_iser_hdr(struct iser_rx_desc *desc)
{
return PTR_ALIGN(desc->buf + ISER_HEADERS_LEN, 512) - ISER_HEADERS_LEN;
}
static size_t isert_get_hdr_offset(struct iser_rx_desc *desc)
{
return isert_get_iser_hdr(desc) - (void *)desc->buf;
}
static void *isert_get_iscsi_hdr(struct iser_rx_desc *desc)
{
return isert_get_iser_hdr(desc) + sizeof(struct iser_ctrl);
}
static void *isert_get_data(struct iser_rx_desc *desc)
{
void *data = isert_get_iser_hdr(desc) + ISER_HEADERS_LEN;
WARN_ON((uintptr_t)data & 511);
return data;
}
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_desc;
char *login_rsp_buf;
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;
};
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