#define ISER_FASTREG_LI_WRID 0xffffffffffffffffULL
#define ISER_BEACON_WRID 0xfffffffffffffffeULL
+/**
+ * struct iser_hdr - iSER header
+ *
+ * @flags: flags support (zbva, remote_inv)
+ * @rsvd: reserved
+ * @write_stag: write rkey
+ * @write_va: write virtual address
+ * @reaf_stag: read rkey
+ * @read_va: read virtual address
+ */
struct iser_hdr {
u8 flags;
u8 rsvd[3];
- __be32 write_stag; /* write rkey */
+ __be32 write_stag;
__be64 write_va;
- __be32 read_stag; /* read rkey */
+ __be32 read_stag;
__be64 read_va;
} __attribute__((packed));
ISER_DIRS_NUM
};
+/**
+ * struct iser_data_buf - iSER data buffer
+ *
+ * @buf: pointer to the sg list
+ * @size: num entries of this sg
+ * @data_len: total beffer byte len
+ * @dma_nents: returned by dma_map_sg
+ * @copy_buf: allocated copy buf for SGs unaligned
+ * for rdma which are copied
+ * @sg_single: SG-ified clone of a non SG SC or
+ * unaligned SG
+ */
struct iser_data_buf {
- void *buf; /* pointer to the sg list */
- unsigned int size; /* num entries of this sg */
- unsigned long data_len; /* total data len */
- unsigned int dma_nents; /* returned by dma_map_sg */
- char *copy_buf; /* allocated copy buf for SGs unaligned *
- * for rdma which are copied */
- struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
- * unaligned SG */
+ void *buf;
+ unsigned int size;
+ unsigned long data_len;
+ unsigned int dma_nents;
+ char *copy_buf;
+ struct scatterlist sg_single;
};
/* fwd declarations */
struct iscsi_iser_task;
struct iscsi_endpoint;
+/**
+ * struct iser_mem_reg - iSER memory registration info
+ *
+ * @lkey: MR local key
+ * @rkey: MR remote key
+ * @va: MR start address (buffer va)
+ * @len: MR length
+ * @mem_h: pointer to registration context (FMR/Fastreg)
+ * @is_mr: indicates weather we registered the buffer
+ */
struct iser_mem_reg {
u32 lkey;
u32 rkey;
int is_mr;
};
+/**
+ * struct iser_regd_buf - iSER buffer registration desc
+ *
+ * @reg: memory registration info
+ * @virt_addr: virtual address of buffer
+ * @device: reference to iser device
+ * @direction: dma direction (for dma_unmap)
+ * @data_size: data buffer size in bytes
+ */
struct iser_regd_buf {
- struct iser_mem_reg reg; /* memory registration info */
+ struct iser_mem_reg reg;
void *virt_addr;
- struct iser_device *device; /* device->device for dma_unmap */
- enum dma_data_direction direction; /* direction for dma_unmap */
+ struct iser_device *device;
+ enum dma_data_direction direction;
unsigned int data_size;
};
ISCSI_TX_DATAOUT
};
+/**
+ * struct iser_tx_desc - iSER TX descriptor (for send wr_id)
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @type: command/control/dataout
+ * @dam_addr: header buffer dma_address
+ * @tx_sg: sg[0] points to iser/iscsi headers
+ * sg[1] optionally points to either of immediate data
+ * unsolicited data-out or control
+ * @num_sge: number sges used on this TX task
+ */
struct iser_tx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
enum iser_desc_type type;
u64 dma_addr;
- /* sg[0] points to iser/iscsi headers, sg[1] optionally points to either
- of immediate data, unsolicited data-out or control (login,text) */
struct ib_sge tx_sg[2];
int num_sge;
};
#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
sizeof(u64) + sizeof(struct ib_sge)))
+/**
+ * struct iser_rx_desc - iSER RX descriptor (for recv wr_id)
+ *
+ * @iser_header: iser header
+ * @iscsi_header: iscsi header
+ * @data: received data segment
+ * @dma_addr: receive buffer dma address
+ * @rx_sg: ib_sge of receive buffer
+ * @pad: for sense data TODO: Modify to maximum sense length supported
+ */
struct iser_rx_desc {
struct iser_hdr iser_header;
struct iscsi_hdr iscsi_header;
int active_qps;
};
+/**
+ * struct iser_device - iSER device handle
+ *
+ * @ib_device: RDMA device
+ * @pd: Protection Domain for this device
+ * @dev_attr: Device attributes container
+ * @mr: Global DMA memory region
+ * @event_handler: IB events handle routine
+ * @ig_list: entry in devices list
+ * @refcount: Reference counter, dominated by open iser connections
+ * @comps_used: Number of completion contexts used, Min between online
+ * cpus and device max completion vectors
+ * @comps: Dinamically allocated array of completion handlers
+ * Memory registration pool Function pointers (FMR or Fastreg):
+ * @iser_alloc_rdma_reg_res: Allocation of memory regions pool
+ * @iser_free_rdma_reg_res: Free of memory regions pool
+ * @iser_reg_rdma_mem: Memory registration routine
+ * @iser_unreg_rdma_mem: Memory deregistration routine
+ */
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
struct ib_device_attr dev_attr;
struct ib_mr *mr;
struct ib_event_handler event_handler;
- struct list_head ig_list; /* entry in ig devices list */
+ struct list_head ig_list;
int refcount;
int comps_used;
struct iser_comp comps[ISER_MAX_CQ];
ISER_FASTREG_PROTECTED = 1 << 3,
};
+/**
+ * struct iser_pi_context - Protection information context
+ *
+ * @prot_mr: protection memory region
+ * @prot_frpl: protection fastreg page list
+ * @sig_mr: signature feature enabled memory region
+ */
struct iser_pi_context {
struct ib_mr *prot_mr;
struct ib_fast_reg_page_list *prot_frpl;
struct ib_mr *sig_mr;
};
+/**
+ * struct fast_reg_descriptor - Fast registration descriptor
+ *
+ * @list: entry in connection fastreg pool
+ * @data_mr: data memory region
+ * @data_frpl: data fastreg page list
+ * @pi_ctx: protection information context
+ * @reg_indicators: fast registration indicators
+ */
struct fast_reg_descriptor {
struct list_head list;
- /* For fast registration - FRWR */
struct ib_mr *data_mr;
struct ib_fast_reg_page_list *data_frpl;
struct iser_pi_context *pi_ctx;
- /* registration indicators container */
u8 reg_indicators;
};
};
};
+/**
+ * struct iser_conn - iSER connection context
+ *
+ * @ib_conn: connection RDMA resources
+ * @iscsi_conn: link to matching iscsi connection
+ * @ep: transport handle
+ * @state: connection logical state
+ * @qp_max_recv_dtos: maximum number of data outs, corresponds
+ * to max number of post recvs
+ * @qp_max_recv_dtos_mask: (qp_max_recv_dtos - 1)
+ * @min_posted_rx: (qp_max_recv_dtos >> 2)
+ * @name: connection peer portal
+ * @release_work: deffered work for release job
+ * @state_mutex: protects iser onnection state
+ * @stop_completion: conn_stop completion
+ * @ib_completion: RDMA cleanup completion
+ * @up_completion: connection establishment completed
+ * (state is ISER_CONN_UP)
+ * @conn_list: entry in ig conn list
+ * @login_buf: login data buffer (stores login parameters)
+ * @login_req_buf: login request buffer
+ * @login_req_dma: login request buffer dma address
+ * @login_resp_buf: login response buffer
+ * @login_resp_dma: login response buffer dma address
+ * @rx_desc_head: head of rx_descs cyclic buffer
+ * @rx_descs: rx buffers array (cyclic buffer)
+ * @num_rx_descs: number of rx descriptors
+ */
struct iser_conn {
struct ib_conn ib_conn;
struct iscsi_conn *iscsi_conn;
struct iscsi_endpoint *ep;
- enum iser_conn_state state; /* rdma connection state */
- unsigned qp_max_recv_dtos; /* num of rx buffers */
- unsigned qp_max_recv_dtos_mask; /* above minus 1 */
- unsigned min_posted_rx; /* qp_max_recv_dtos >> 2 */
+ enum iser_conn_state state;
+ unsigned qp_max_recv_dtos;
+ unsigned qp_max_recv_dtos_mask;
+ unsigned min_posted_rx;
char name[ISER_OBJECT_NAME_SIZE];
struct work_struct release_work;
struct mutex state_mutex;
struct completion stop_completion;
struct completion ib_completion;
struct completion up_completion;
- struct list_head conn_list; /* entry in ig conn list */
+ struct list_head conn_list;
char *login_buf;
char *login_req_buf, *login_resp_buf;
u32 num_rx_descs;
};
+/**
+ * struct iscsi_iser_task - iser task context
+ *
+ * @desc: TX descriptor
+ * @iser_conn: link to iser connection
+ * @status: current task status
+ * @sc: link to scsi command
+ * @command_sent: indicate if command was sent
+ * @dir: iser data direction
+ * @rdma_regd: task rdma registration desc
+ * @data: iser data buffer desc
+ * @data_copy: iser data copy buffer desc (bounce buffer)
+ * @prot: iser protection buffer desc
+ * @prot_copy: iser protection copy buffer desc (bounce buffer)
+ */
struct iscsi_iser_task {
struct iser_tx_desc desc;
struct iser_conn *iser_conn;
enum iser_task_status status;
struct scsi_cmnd *sc;
- int command_sent; /* set if command sent */
- int dir[ISER_DIRS_NUM]; /* set if dir use*/
- struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
- struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
- struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
- struct iser_data_buf prot[ISER_DIRS_NUM]; /* prot desc */
- struct iser_data_buf prot_copy[ISER_DIRS_NUM];/* prot copy */
+ int command_sent;
+ int dir[ISER_DIRS_NUM];
+ struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];
+ struct iser_data_buf data[ISER_DIRS_NUM];
+ struct iser_data_buf data_copy[ISER_DIRS_NUM];
+ struct iser_data_buf prot[ISER_DIRS_NUM];
+ struct iser_data_buf prot_copy[ISER_DIRS_NUM];
};
struct iser_page_vec {
int data_size;
};
+/**
+ * struct iser_global: iSER global context
+ *
+ * @device_list_mutex: protects device_list
+ * @device_list: iser devices global list
+ * @connlist_mutex: protects connlist
+ * @connlist: iser connections global list
+ * @desc_cache: kmem cache for tx dataout
+ */
struct iser_global {
- struct mutex device_list_mutex;/* */
- struct list_head device_list; /* all iSER devices */
+ struct mutex device_list_mutex;
+ struct list_head device_list;
struct mutex connlist_mutex;
- struct list_head connlist; /* all iSER IB connections */
-
+ struct list_head connlist;
struct kmem_cache *desc_cache;
};
struct iscsi_data *hdr);
void iscsi_iser_recv(struct iscsi_conn *conn,
- struct iscsi_hdr *hdr,
- char *rx_data,
- int rx_data_len);
+ struct iscsi_hdr *hdr,
+ char *rx_data,
+ int rx_data_len);
void iser_conn_init(struct iser_conn *iser_conn);
void iser_release_work(struct work_struct *work);
void iser_rcv_completion(struct iser_rx_desc *desc,
- unsigned long dto_xfer_len,
+ unsigned long dto_xfer_len,
struct ib_conn *ib_conn);
void iser_snd_completion(struct iser_tx_desc *desc,
int iser_reg_rdma_mem_fastreg(struct iscsi_iser_task *task,
enum iser_data_dir cmd_dir);
-int iser_connect(struct iser_conn *iser_conn,
- struct sockaddr *src_addr,
- struct sockaddr *dst_addr,
- int non_blocking);
+int iser_connect(struct iser_conn *iser_conn,
+ struct sockaddr *src_addr,
+ struct sockaddr *dst_addr,
+ int non_blocking);
int iser_reg_page_vec(struct ib_conn *ib_conn,
struct iser_page_vec *page_vec,
- struct iser_mem_reg *mem_reg);
+ struct iser_mem_reg *mem_reg);
void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task,
enum iser_data_dir cmd_dir);
bool signal);
int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
- struct iser_data_buf *data,
- enum iser_data_dir iser_dir,
- enum dma_data_direction dma_dir);
+ struct iser_data_buf *data,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir);
void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task,
struct iser_data_buf *data);
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