| /* |
| * iSER transport for the Open iSCSI Initiator & iSER transport internals |
| * |
| * Copyright (C) 2004 Dmitry Yusupov |
| * Copyright (C) 2004 Alex Aizman |
| * Copyright (C) 2005 Mike Christie |
| * based on code maintained by open-iscsi@googlegroups.com |
| * |
| * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved. |
| * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
| * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved. |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose to be licensed under the terms of the GNU |
| * General Public License (GPL) Version 2, available from the file |
| * COPYING in the main directory of this source tree, or the |
| * OpenIB.org BSD license below: |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #ifndef __ISCSI_ISER_H__ |
| #define __ISCSI_ISER_H__ |
| |
| #include <linux/types.h> |
| #include <linux/net.h> |
| #include <linux/printk.h> |
| #include <scsi/libiscsi.h> |
| #include <scsi/scsi_transport_iscsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/iser.h> |
| |
| #include <linux/interrupt.h> |
| #include <linux/wait.h> |
| #include <linux/sched.h> |
| #include <linux/list.h> |
| #include <linux/slab.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/mutex.h> |
| #include <linux/mempool.h> |
| #include <linux/uio.h> |
| |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/in6.h> |
| |
| #include <rdma/ib_verbs.h> |
| #include <rdma/rdma_cm.h> |
| |
| #define DRV_NAME "iser" |
| #define PFX DRV_NAME ": " |
| #define DRV_VER "1.6" |
| |
| #define iser_dbg(fmt, arg...) \ |
| do { \ |
| if (unlikely(iser_debug_level > 2)) \ |
| printk(KERN_DEBUG PFX "%s: " fmt,\ |
| __func__ , ## arg); \ |
| } while (0) |
| |
| #define iser_warn(fmt, arg...) \ |
| do { \ |
| if (unlikely(iser_debug_level > 0)) \ |
| pr_warn(PFX "%s: " fmt, \ |
| __func__ , ## arg); \ |
| } while (0) |
| |
| #define iser_info(fmt, arg...) \ |
| do { \ |
| if (unlikely(iser_debug_level > 1)) \ |
| pr_info(PFX "%s: " fmt, \ |
| __func__ , ## arg); \ |
| } while (0) |
| |
| #define iser_err(fmt, arg...) \ |
| pr_err(PFX "%s: " fmt, __func__ , ## arg) |
| |
| /* Default support is 512KB I/O size */ |
| #define ISER_DEF_MAX_SECTORS 1024 |
| #define ISCSI_ISER_DEF_SG_TABLESIZE \ |
| ((ISER_DEF_MAX_SECTORS * SECTOR_SIZE) >> ilog2(SZ_4K)) |
| /* Maximum support is 16MB I/O size */ |
| #define ISCSI_ISER_MAX_SG_TABLESIZE ((32768 * SECTOR_SIZE) >> ilog2(SZ_4K)) |
| |
| #define ISER_DEF_XMIT_CMDS_DEFAULT 512 |
| #if ISCSI_DEF_XMIT_CMDS_MAX > ISER_DEF_XMIT_CMDS_DEFAULT |
| #define ISER_DEF_XMIT_CMDS_MAX ISCSI_DEF_XMIT_CMDS_MAX |
| #else |
| #define ISER_DEF_XMIT_CMDS_MAX ISER_DEF_XMIT_CMDS_DEFAULT |
| #endif |
| #define ISER_DEF_CMD_PER_LUN ISER_DEF_XMIT_CMDS_MAX |
| |
| /* QP settings */ |
| /* Maximal bounds on received asynchronous PDUs */ |
| #define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */ |
| |
| #define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), * |
| * SCSI_TMFUNC(2), LOGOUT(1) */ |
| |
| #define ISER_QP_MAX_RECV_DTOS (ISER_DEF_XMIT_CMDS_MAX) |
| |
| #define ISER_MIN_POSTED_RX (ISER_DEF_XMIT_CMDS_MAX >> 2) |
| |
| /* the max TX (send) WR supported by the iSER QP is defined by * |
| * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect * |
| * to have at max for SCSI command. The tx posting & completion handling code * |
| * supports -EAGAIN scheme where tx is suspended till the QP has room for more * |
| * send WR. D=8 comes from 64K/8K */ |
| |
| #define ISER_INFLIGHT_DATAOUTS 8 |
| |
| #define ISER_QP_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
| (1 + ISER_INFLIGHT_DATAOUTS) + \ |
| ISER_MAX_TX_MISC_PDUS + \ |
| ISER_MAX_RX_MISC_PDUS) |
| |
| /* Max registration work requests per command */ |
| #define ISER_MAX_REG_WR_PER_CMD 5 |
| |
| /* For Signature we don't support DATAOUTs so no need to make room for them */ |
| #define ISER_QP_SIG_MAX_REQ_DTOS (ISER_DEF_XMIT_CMDS_MAX * \ |
| (1 + ISER_MAX_REG_WR_PER_CMD) + \ |
| ISER_MAX_TX_MISC_PDUS + \ |
| ISER_MAX_RX_MISC_PDUS) |
| |
| #define ISER_GET_MAX_XMIT_CMDS(send_wr) ((send_wr \ |
| - ISER_MAX_TX_MISC_PDUS \ |
| - ISER_MAX_RX_MISC_PDUS) / \ |
| (1 + ISER_INFLIGHT_DATAOUTS)) |
| |
| #define ISER_SIGNAL_CMD_COUNT 32 |
| |
| /* Constant PDU lengths calculations */ |
| #define ISER_HEADERS_LEN (sizeof(struct iser_ctrl) + sizeof(struct iscsi_hdr)) |
| |
| #define ISER_RECV_DATA_SEG_LEN 128 |
| #define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN) |
| #define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN) |
| |
| /* Length of an object name string */ |
| #define ISER_OBJECT_NAME_SIZE 64 |
| |
| enum iser_conn_state { |
| ISER_CONN_INIT, /* descriptor allocd, no conn */ |
| ISER_CONN_PENDING, /* in the process of being established */ |
| ISER_CONN_UP, /* up and running */ |
| ISER_CONN_TERMINATING, /* in the process of being terminated */ |
| ISER_CONN_DOWN, /* shut down */ |
| ISER_CONN_STATES_NUM |
| }; |
| |
| enum iser_task_status { |
| ISER_TASK_STATUS_INIT = 0, |
| ISER_TASK_STATUS_STARTED, |
| ISER_TASK_STATUS_COMPLETED |
| }; |
| |
| enum iser_data_dir { |
| ISER_DIR_IN = 0, /* to initiator */ |
| ISER_DIR_OUT, /* from initiator */ |
| ISER_DIRS_NUM |
| }; |
| |
| /** |
| * struct iser_data_buf - iSER data buffer |
| * |
| * @sg: pointer to the sg list |
| * @size: num entries of this sg |
| * @data_len: total beffer byte len |
| * @dma_nents: returned by dma_map_sg |
| */ |
| struct iser_data_buf { |
| struct scatterlist *sg; |
| int size; |
| unsigned long data_len; |
| int dma_nents; |
| }; |
| |
| /* fwd declarations */ |
| struct iser_device; |
| struct iscsi_iser_task; |
| struct iscsi_endpoint; |
| struct iser_reg_resources; |
| |
| /** |
| * struct iser_mem_reg - iSER memory registration info |
| * |
| * @sge: memory region sg element |
| * @rkey: memory region remote key |
| * @mem_h: pointer to registration context (FMR/Fastreg) |
| */ |
| struct iser_mem_reg { |
| struct ib_sge sge; |
| u32 rkey; |
| void *mem_h; |
| }; |
| |
| enum iser_desc_type { |
| ISCSI_TX_CONTROL , |
| ISCSI_TX_SCSI_COMMAND, |
| ISCSI_TX_DATAOUT |
| }; |
| |
| /** |
| * struct iser_tx_desc - iSER TX descriptor |
| * |
| * @iser_header: iser header |
| * @iscsi_header: iscsi header |
| * @type: command/control/dataout |
| * @dma_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 |
| * @cqe: completion handler |
| * @mapped: Is the task header mapped |
| * @reg_wr: registration WR |
| * @send_wr: send WR |
| * @inv_wr: invalidate WR |
| */ |
| struct iser_tx_desc { |
| struct iser_ctrl iser_header; |
| struct iscsi_hdr iscsi_header; |
| enum iser_desc_type type; |
| u64 dma_addr; |
| struct ib_sge tx_sg[2]; |
| int num_sge; |
| struct ib_cqe cqe; |
| bool mapped; |
| struct ib_reg_wr reg_wr; |
| struct ib_send_wr send_wr; |
| struct ib_send_wr inv_wr; |
| }; |
| |
| #define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \ |
| sizeof(u64) + sizeof(struct ib_sge) + \ |
| sizeof(struct ib_cqe))) |
| /** |
| * struct iser_rx_desc - iSER RX descriptor |
| * |
| * @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 |
| * @cqe: completion handler |
| * @pad: for sense data TODO: Modify to maximum sense length supported |
| */ |
| struct iser_rx_desc { |
| struct iser_ctrl iser_header; |
| struct iscsi_hdr iscsi_header; |
| char data[ISER_RECV_DATA_SEG_LEN]; |
| u64 dma_addr; |
| struct ib_sge rx_sg; |
| struct ib_cqe cqe; |
| char pad[ISER_RX_PAD_SIZE]; |
| } __packed; |
| |
| /** |
| * struct iser_login_desc - iSER login descriptor |
| * |
| * @req: pointer to login request buffer |
| * @rsp: pointer to login response buffer |
| * @req_dma: DMA address of login request buffer |
| * @rsp_dma: DMA address of login response buffer |
| * @sge: IB sge for login post recv |
| * @cqe: completion handler |
| */ |
| struct iser_login_desc { |
| void *req; |
| void *rsp; |
| u64 req_dma; |
| u64 rsp_dma; |
| struct ib_sge sge; |
| struct ib_cqe cqe; |
| } __packed; |
| |
| struct iser_conn; |
| struct ib_conn; |
| |
| /** |
| * struct iser_device - iSER device handle |
| * |
| * @ib_device: RDMA device |
| * @pd: Protection Domain for this device |
| * @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 |
| */ |
| struct iser_device { |
| struct ib_device *ib_device; |
| struct ib_pd *pd; |
| struct ib_event_handler event_handler; |
| struct list_head ig_list; |
| int refcount; |
| }; |
| |
| /** |
| * struct iser_reg_resources - Fast registration resources |
| * |
| * @mr: memory region |
| * @sig_mr: signature memory region |
| * @mr_valid: is mr valid indicator |
| */ |
| struct iser_reg_resources { |
| struct ib_mr *mr; |
| struct ib_mr *sig_mr; |
| u8 mr_valid:1; |
| }; |
| |
| /** |
| * struct iser_fr_desc - Fast registration descriptor |
| * |
| * @list: entry in connection fastreg pool |
| * @rsc: data buffer registration resources |
| * @sig_protected: is region protected indicator |
| * @all_list: first and last list members |
| */ |
| struct iser_fr_desc { |
| struct list_head list; |
| struct iser_reg_resources rsc; |
| bool sig_protected; |
| struct list_head all_list; |
| }; |
| |
| /** |
| * struct iser_fr_pool - connection fast registration pool |
| * |
| * @list: list of fastreg descriptors |
| * @lock: protects fastreg pool |
| * @size: size of the pool |
| * @all_list: first and last list members |
| */ |
| struct iser_fr_pool { |
| struct list_head list; |
| spinlock_t lock; |
| int size; |
| struct list_head all_list; |
| }; |
| |
| /** |
| * struct ib_conn - Infiniband related objects |
| * |
| * @cma_id: rdma_cm connection maneger handle |
| * @qp: Connection Queue-pair |
| * @cq: Connection completion queue |
| * @cq_size: The number of max outstanding completions |
| * @post_recv_buf_count: post receive counter |
| * @sig_count: send work request signal count |
| * @rx_wr: receive work request for batch posts |
| * @device: reference to iser device |
| * @fr_pool: connection fast registration poool |
| * @pi_support: Indicate device T10-PI support |
| * @reg_cqe: completion handler |
| */ |
| struct ib_conn { |
| struct rdma_cm_id *cma_id; |
| struct ib_qp *qp; |
| struct ib_cq *cq; |
| u32 cq_size; |
| int post_recv_buf_count; |
| u8 sig_count; |
| struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; |
| struct iser_device *device; |
| struct iser_fr_pool fr_pool; |
| bool pi_support; |
| struct ib_cqe reg_cqe; |
| }; |
| |
| /** |
| * 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) |
| * @max_cmds: maximum cmds allowed for this connection |
| * @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_desc: login descriptor |
| * @rx_desc_head: head of rx_descs cyclic buffer |
| * @rx_descs: rx buffers array (cyclic buffer) |
| * @num_rx_descs: number of rx descriptors |
| * @scsi_sg_tablesize: scsi host sg_tablesize |
| * @pages_per_mr: maximum pages available for registration |
| * @snd_w_inv: connection uses remote invalidation |
| */ |
| struct iser_conn { |
| struct ib_conn ib_conn; |
| struct iscsi_conn *iscsi_conn; |
| struct iscsi_endpoint *ep; |
| enum iser_conn_state state; |
| unsigned qp_max_recv_dtos; |
| unsigned qp_max_recv_dtos_mask; |
| unsigned min_posted_rx; |
| u16 max_cmds; |
| 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; |
| struct iser_login_desc login_desc; |
| unsigned int rx_desc_head; |
| struct iser_rx_desc *rx_descs; |
| u32 num_rx_descs; |
| unsigned short scsi_sg_tablesize; |
| unsigned short pages_per_mr; |
| bool snd_w_inv; |
| }; |
| |
| /** |
| * 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_reg: task rdma registration desc |
| * @data: iser data buffer desc |
| * @prot: iser protection buffer desc |
| */ |
| 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; |
| int dir[ISER_DIRS_NUM]; |
| struct iser_mem_reg rdma_reg[ISER_DIRS_NUM]; |
| struct iser_data_buf data[ISER_DIRS_NUM]; |
| struct iser_data_buf prot[ISER_DIRS_NUM]; |
| }; |
| |
| /** |
| * 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; |
| struct mutex connlist_mutex; |
| struct list_head connlist; |
| struct kmem_cache *desc_cache; |
| }; |
| |
| extern struct iser_global ig; |
| extern int iser_debug_level; |
| extern bool iser_pi_enable; |
| extern int iser_pi_guard; |
| extern unsigned int iser_max_sectors; |
| extern bool iser_always_reg; |
| |
| int iser_send_control(struct iscsi_conn *conn, |
| struct iscsi_task *task); |
| |
| int iser_send_command(struct iscsi_conn *conn, |
| struct iscsi_task *task); |
| |
| int iser_send_data_out(struct iscsi_conn *conn, |
| struct iscsi_task *task, |
| struct iscsi_data *hdr); |
| |
| void iscsi_iser_recv(struct iscsi_conn *conn, |
| struct iscsi_hdr *hdr, |
| char *rx_data, |
| int rx_data_len); |
| |
| void iser_conn_init(struct iser_conn *iser_conn); |
| |
| void iser_conn_release(struct iser_conn *iser_conn); |
| |
| int iser_conn_terminate(struct iser_conn *iser_conn); |
| |
| void iser_release_work(struct work_struct *work); |
| |
| void iser_err_comp(struct ib_wc *wc, const char *type); |
| void iser_login_rsp(struct ib_cq *cq, struct ib_wc *wc); |
| void iser_task_rsp(struct ib_cq *cq, struct ib_wc *wc); |
| void iser_cmd_comp(struct ib_cq *cq, struct ib_wc *wc); |
| void iser_ctrl_comp(struct ib_cq *cq, struct ib_wc *wc); |
| void iser_dataout_comp(struct ib_cq *cq, struct ib_wc *wc); |
| void iser_reg_comp(struct ib_cq *cq, struct ib_wc *wc); |
| |
| void iser_task_rdma_init(struct iscsi_iser_task *task); |
| |
| void iser_task_rdma_finalize(struct iscsi_iser_task *task); |
| |
| void iser_free_rx_descriptors(struct iser_conn *iser_conn); |
| |
| void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *mem, |
| enum iser_data_dir cmd_dir); |
| |
| int iser_reg_mem_fastreg(struct iscsi_iser_task *task, |
| enum iser_data_dir dir, |
| bool all_imm); |
| void iser_unreg_mem_fastreg(struct iscsi_iser_task *task, |
| enum iser_data_dir dir); |
| |
| int iser_connect(struct iser_conn *iser_conn, |
| struct sockaddr *src_addr, |
| struct sockaddr *dst_addr, |
| int non_blocking); |
| |
| int iser_post_recvl(struct iser_conn *iser_conn); |
| int iser_post_recvm(struct iser_conn *iser_conn, int count); |
| int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc, |
| 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); |
| |
| void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task, |
| struct iser_data_buf *data, |
| enum dma_data_direction dir); |
| |
| int iser_initialize_task_headers(struct iscsi_task *task, |
| struct iser_tx_desc *tx_desc); |
| int iser_alloc_rx_descriptors(struct iser_conn *iser_conn, |
| struct iscsi_session *session); |
| int iser_alloc_fastreg_pool(struct ib_conn *ib_conn, |
| unsigned cmds_max, |
| unsigned int size); |
| void iser_free_fastreg_pool(struct ib_conn *ib_conn); |
| u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task, |
| enum iser_data_dir cmd_dir, sector_t *sector); |
| |
| static inline struct iser_conn * |
| to_iser_conn(struct ib_conn *ib_conn) |
| { |
| return container_of(ib_conn, struct iser_conn, ib_conn); |
| } |
| |
| static inline struct iser_rx_desc * |
| iser_rx(struct ib_cqe *cqe) |
| { |
| return container_of(cqe, struct iser_rx_desc, cqe); |
| } |
| |
| static inline struct iser_tx_desc * |
| iser_tx(struct ib_cqe *cqe) |
| { |
| return container_of(cqe, struct iser_tx_desc, cqe); |
| } |
| |
| static inline struct iser_login_desc * |
| iser_login(struct ib_cqe *cqe) |
| { |
| return container_of(cqe, struct iser_login_desc, cqe); |
| } |
| |
| #endif |
