/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "iser" #define PFX DRV_NAME ": " #define DRV_VER "1.4.1" #define iser_dbg(fmt, arg...) \ do { \ if (iser_debug_level > 2) \ printk(KERN_DEBUG PFX "%s: " fmt,\ __func__ , ## arg); \ } while (0) #define iser_warn(fmt, arg...) \ do { \ if (iser_debug_level > 0) \ pr_warn(PFX "%s: " fmt, \ __func__ , ## arg); \ } while (0) #define iser_info(fmt, arg...) \ do { \ if (iser_debug_level > 1) \ pr_info(PFX "%s: " fmt, \ __func__ , ## arg); \ } while (0) #define iser_err(fmt, arg...) \ do { \ printk(KERN_ERR PFX "%s: " fmt, \ __func__ , ## arg); \ } while (0) #define SHIFT_4K 12 #define SIZE_4K (1ULL << SHIFT_4K) #define MASK_4K (~(SIZE_4K-1)) /* support up to 512KB in one RDMA */ #define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_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_WC_BATCH_COUNT 16 #define ISER_SIGNAL_CMD_COUNT 32 #define ISER_VER 0x10 #define ISER_WSV 0x08 #define ISER_RSV 0x04 #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; __be64 write_va; __be32 read_stag; __be64 read_va; } __attribute__((packed)); #define ISER_ZBVA_NOT_SUPPORTED 0x80 #define ISER_SEND_W_INV_NOT_SUPPORTED 0x40 struct iser_cm_hdr { u8 flags; u8 rsvd[3]; } __packed; /* Constant PDU lengths calculations */ #define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + 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 * * @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; unsigned int size; unsigned long data_len; unsigned int dma_nents; char *copy_buf; struct scatterlist sg_single; }; /* fwd declarations */ struct iser_device; 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; u64 va; u64 len; void *mem_h; 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; void *virt_addr; struct iser_device *device; enum dma_data_direction direction; unsigned int data_size; }; enum iser_desc_type { ISCSI_TX_CONTROL , ISCSI_TX_SCSI_COMMAND, 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; 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; char data[ISER_RECV_DATA_SEG_LEN]; u64 dma_addr; struct ib_sge rx_sg; char pad[ISER_RX_PAD_SIZE]; } __attribute__((packed)); #define ISER_MAX_CQ 4 struct iser_conn; struct ib_conn; struct iscsi_iser_task; /** * struct iser_comp - iSER completion context * * @device: pointer to device handle * @cq: completion queue * @wcs: work completion array * @tasklet: Tasklet handle * @active_qps: Number of active QPs attached * to completion context */ struct iser_comp { struct iser_device *device; struct ib_cq *cq; struct ib_wc wcs[ISER_WC_BATCH_COUNT]; struct tasklet_struct tasklet; 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; int refcount; int comps_used; struct iser_comp comps[ISER_MAX_CQ]; int (*iser_alloc_rdma_reg_res)(struct ib_conn *ib_conn, unsigned cmds_max); void (*iser_free_rdma_reg_res)(struct ib_conn *ib_conn); int (*iser_reg_rdma_mem)(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir); void (*iser_unreg_rdma_mem)(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir); }; #define ISER_CHECK_GUARD 0xc0 #define ISER_CHECK_REFTAG 0x0f #define ISER_CHECK_APPTAG 0x30 enum iser_reg_indicator { ISER_DATA_KEY_VALID = 1 << 0, ISER_PROT_KEY_VALID = 1 << 1, ISER_SIG_KEY_VALID = 1 << 2, 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; struct ib_mr *data_mr; struct ib_fast_reg_page_list *data_frpl; struct iser_pi_context *pi_ctx; u8 reg_indicators; }; /** * struct ib_conn - Infiniband related objects * * @cma_id: rdma_cm connection maneger handle * @qp: Connection Queue-pair * @post_recv_buf_count: post receive counter * @rx_wr: receive work request for batch posts * @device: reference to iser device * @comp: iser completion context * @pi_support: Indicate device T10-PI support * @beacon: beacon send wr to signal all flush errors were drained * @flush_comp: completes when all connection completions consumed * @lock: protects fmr/fastreg pool * @union.fmr: * @pool: FMR pool for fast registrations * @page_vec: page vector to hold mapped commands pages * used for registration * @union.fastreg: * @pool: Fast registration descriptors pool for fast * registrations * @pool_size: Size of pool */ struct ib_conn { struct rdma_cm_id *cma_id; struct ib_qp *qp; int post_recv_buf_count; struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX]; struct iser_device *device; struct iser_comp *comp; bool pi_support; struct ib_send_wr beacon; struct completion flush_comp; spinlock_t lock; union { struct { struct ib_fmr_pool *pool; struct iser_page_vec *page_vec; } fmr; struct { struct list_head pool; int pool_size; } fastreg; }; }; /** * 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; 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; char *login_buf; char *login_req_buf, *login_resp_buf; u64 login_req_dma, login_resp_dma; unsigned int rx_desc_head; struct iser_rx_desc *rx_descs; 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; 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 { u64 *pages; int length; int offset; 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; 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; 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_rcv_completion(struct iser_rx_desc *desc, unsigned long dto_xfer_len, struct ib_conn *ib_conn); void iser_snd_completion(struct iser_tx_desc *desc, struct ib_conn *ib_conn); 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, struct iser_data_buf *mem_copy, enum iser_data_dir cmd_dir); int iser_reg_rdma_mem_fmr(struct iscsi_iser_task *task, enum iser_data_dir cmd_dir); 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_reg_page_vec(struct ib_conn *ib_conn, struct iser_page_vec *page_vec, struct iser_mem_reg *mem_reg); void iser_unreg_mem_fmr(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir); void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task, enum iser_data_dir cmd_dir); 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); 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_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max); void iser_free_fmr_pool(struct ib_conn *ib_conn); int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max); 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); #endif