--- /dev/null
+/*
+ * Copyright (c) 2005 Cisco Systems. 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 IB_SRP_H
+#define IB_SRP_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/scatterlist.h>
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_sa.h>
+#include <rdma/ib_cm.h>
+#include <rdma/ib_fmr_pool.h>
+
+enum {
+ SRP_PATH_REC_TIMEOUT_MS = 1000,
+ SRP_ABORT_TIMEOUT_MS = 5000,
+
+ SRP_PORT_REDIRECT = 1,
+ SRP_DLID_REDIRECT = 2,
+ SRP_STALE_CONN = 3,
+
+ SRP_MAX_LUN = 512,
+ SRP_DEF_SG_TABLESIZE = 12,
+
+ SRP_DEFAULT_QUEUE_SIZE = 1 << 6,
+ SRP_RSP_SQ_SIZE = 1,
+ SRP_TSK_MGMT_SQ_SIZE = 1,
+ SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
+ SRP_TSK_MGMT_SQ_SIZE,
+
+ SRP_TAG_NO_REQ = ~0U,
+ SRP_TAG_TSK_MGMT = 1U << 31,
+
+ SRP_MAX_PAGES_PER_MR = 512,
+
+ LOCAL_INV_WR_ID_MASK = 1,
+ FAST_REG_WR_ID_MASK = 2,
+
+ SRP_LAST_WR_ID = 0xfffffffcU,
+};
+
+enum srp_target_state {
+ SRP_TARGET_SCANNING,
+ SRP_TARGET_LIVE,
+ SRP_TARGET_REMOVED,
+};
+
+enum srp_iu_type {
+ SRP_IU_CMD,
+ SRP_IU_TSK_MGMT,
+ SRP_IU_RSP,
+};
+
+/*
+ * @mr_page_mask: HCA memory registration page mask.
+ * @mr_page_size: HCA memory registration page size.
+ * @mr_max_size: Maximum size in bytes of a single FMR / FR registration
+ * request.
+ */
+struct srp_device {
+ struct list_head dev_list;
+ struct ib_device *dev;
+ struct ib_pd *pd;
+ struct ib_mr *mr;
+ u64 mr_page_mask;
+ int mr_page_size;
+ int mr_max_size;
+ int max_pages_per_mr;
+ bool has_fmr;
+ bool has_fr;
+ bool use_fast_reg;
+};
+
+struct srp_host {
+ struct srp_device *srp_dev;
+ u8 port;
+ struct device dev;
+ struct list_head target_list;
+ spinlock_t target_lock;
+ struct completion released;
+ struct list_head list;
+ struct mutex add_target_mutex;
+};
+
+struct srp_request {
+ struct scsi_cmnd *scmnd;
+ struct srp_iu *cmd;
+ union {
+ struct ib_pool_fmr **fmr_list;
+ struct srp_fr_desc **fr_list;
+ };
+ u64 *map_page;
+ struct srp_direct_buf *indirect_desc;
+ dma_addr_t indirect_dma_addr;
+ short nmdesc;
+};
+
+/**
+ * struct srp_rdma_ch
+ * @comp_vector: Completion vector used by this RDMA channel.
+ */
+struct srp_rdma_ch {
+ /* These are RW in the hot path, and commonly used together */
+ struct list_head free_tx;
+ spinlock_t lock;
+ s32 req_lim;
+
+ /* These are read-only in the hot path */
+ struct srp_target_port *target ____cacheline_aligned_in_smp;
+ struct ib_cq *send_cq;
+ struct ib_cq *recv_cq;
+ struct ib_qp *qp;
+ union {
+ struct ib_fmr_pool *fmr_pool;
+ struct srp_fr_pool *fr_pool;
+ };
+
+ /* Everything above this point is used in the hot path of
+ * command processing. Try to keep them packed into cachelines.
+ */
+
+ struct completion done;
+ int status;
+
+ struct ib_sa_path_rec path;
+ struct ib_sa_query *path_query;
+ int path_query_id;
+
+ struct ib_cm_id *cm_id;
+ struct srp_iu **tx_ring;
+ struct srp_iu **rx_ring;
+ struct srp_request *req_ring;
+ int max_ti_iu_len;
+ int comp_vector;
+
+ struct completion tsk_mgmt_done;
+ u8 tsk_mgmt_status;
+ bool connected;
+};
+
+/**
+ * struct srp_target_port
+ * @comp_vector: Completion vector used by the first RDMA channel created for
+ * this target port.
+ */
+struct srp_target_port {
+ /* read and written in the hot path */
+ spinlock_t lock;
+
+ /* read only in the hot path */
+ struct srp_rdma_ch *ch;
+ u32 ch_count;
+ u32 lkey;
+ u32 rkey;
+ enum srp_target_state state;
+ unsigned int max_iu_len;
+ unsigned int cmd_sg_cnt;
+ unsigned int indirect_size;
+ bool allow_ext_sg;
+
+ /* other member variables */
+ union ib_gid sgid;
+ __be64 id_ext;
+ __be64 ioc_guid;
+ __be64 service_id;
+ __be64 initiator_ext;
+ u16 io_class;
+ struct srp_host *srp_host;
+ struct Scsi_Host *scsi_host;
+ struct srp_rport *rport;
+ char target_name[32];
+ unsigned int scsi_id;
+ unsigned int sg_tablesize;
+ int queue_size;
+ int req_ring_size;
+ int comp_vector;
+ int tl_retry_count;
+
+ union ib_gid orig_dgid;
+ __be16 pkey;
+
+ u32 rq_tmo_jiffies;
+
+ int zero_req_lim;
+
+ struct work_struct tl_err_work;
+ struct work_struct remove_work;
+
+ struct list_head list;
+ bool qp_in_error;
+};
+
+struct srp_iu {
+ struct list_head list;
+ u64 dma;
+ void *buf;
+ size_t size;
+ enum dma_data_direction direction;
+};
+
+/**
+ * struct srp_fr_desc - fast registration work request arguments
+ * @entry: Entry in srp_fr_pool.free_list.
+ * @mr: Memory region.
+ * @frpl: Fast registration page list.
+ */
+struct srp_fr_desc {
+ struct list_head entry;
+ struct ib_mr *mr;
+ struct ib_fast_reg_page_list *frpl;
+};
+
+/**
+ * struct srp_fr_pool - pool of fast registration descriptors
+ *
+ * An entry is available for allocation if and only if it occurs in @free_list.
+ *
+ * @size: Number of descriptors in this pool.
+ * @max_page_list_len: Maximum fast registration work request page list length.
+ * @lock: Protects free_list.
+ * @free_list: List of free descriptors.
+ * @desc: Fast registration descriptor pool.
+ */
+struct srp_fr_pool {
+ int size;
+ int max_page_list_len;
+ spinlock_t lock;
+ struct list_head free_list;
+ struct srp_fr_desc desc[0];
+};
+
+/**
+ * struct srp_map_state - per-request DMA memory mapping state
+ * @desc: Pointer to the element of the SRP buffer descriptor array
+ * that is being filled in.
+ * @pages: Array with DMA addresses of pages being considered for
+ * memory registration.
+ * @base_dma_addr: DMA address of the first page that has not yet been mapped.
+ * @dma_len: Number of bytes that will be registered with the next
+ * FMR or FR memory registration call.
+ * @total_len: Total number of bytes in the sg-list being mapped.
+ * @npages: Number of page addresses in the pages[] array.
+ * @nmdesc: Number of FMR or FR memory descriptors used for mapping.
+ * @ndesc: Number of SRP buffer descriptors that have been filled in.
+ * @unmapped_sg: First element of the sg-list that is mapped via FMR or FR.
+ * @unmapped_index: Index of the first element mapped via FMR or FR.
+ * @unmapped_addr: DMA address of the first element mapped via FMR or FR.
+ */
+struct srp_map_state {
+ union {
+ struct ib_pool_fmr **next_fmr;
+ struct srp_fr_desc **next_fr;
+ };
+ struct srp_direct_buf *desc;
+ u64 *pages;
+ dma_addr_t base_dma_addr;
+ u32 dma_len;
+ u32 total_len;
+ unsigned int npages;
+ unsigned int nmdesc;
+ unsigned int ndesc;
+ struct scatterlist *unmapped_sg;
+ int unmapped_index;
+ dma_addr_t unmapped_addr;
+};
+
+#endif /* IB_SRP_H */
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