![Nicholas Bellinger](/assets/img/avatar_default.png)
This patch converts the fixed size se_portal_group->tpg_lun_list[] to use modern RCU with hlist_head in order to support an arbitary number of se_lun ports per target endpoint. It includes dropping core_tpg_alloc_lun() from core_dev_add_lun(), and calling it directly from target_fabric_make_lun() to allocate a new se_lun. And add a new target_fabric_port_release() configfs item callback to invoke kfree_rcu() to release memory during se_lun->lun_group shutdown. Also now that se_node_acl->lun_entry_hlist is using RCU, convert existing tpg_lun_lock to struct mutex so core_tpg_add_node_to_devs() can perform RCU updater logic without releasing ->tpg_lun_mutex. Also, drop core_tpg_clear_object_luns() and it's single consumer in iscsi-target, which is duplicating TPG LUN shutdown logic and is current code results in a NOP. Finally, sbp-target and xen-scsiback fabric driver conversions are included, which are required due to the non-standard way they use ->tpg_lun_hlist. Reviewed-by: Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Chris Boot <bootc@bootc.net> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
243 lines
5.8 KiB
C
243 lines
5.8 KiB
C
#ifndef _SBP_BASE_H
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#define _SBP_BASE_H
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#include <linux/firewire.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/workqueue.h>
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#include <target/target_core_base.h>
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#define SBP_VERSION "v0.1"
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#define SBP_NAMELEN 32
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#define SBP_ORB_FETCH_SIZE 8
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#define MANAGEMENT_AGENT_STATE_IDLE 0
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#define MANAGEMENT_AGENT_STATE_BUSY 1
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#define ORB_NOTIFY(v) (((v) >> 31) & 0x01)
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#define ORB_REQUEST_FORMAT(v) (((v) >> 29) & 0x03)
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#define MANAGEMENT_ORB_FUNCTION(v) (((v) >> 16) & 0x0f)
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#define MANAGEMENT_ORB_FUNCTION_LOGIN 0x0
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#define MANAGEMENT_ORB_FUNCTION_QUERY_LOGINS 0x1
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#define MANAGEMENT_ORB_FUNCTION_RECONNECT 0x3
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#define MANAGEMENT_ORB_FUNCTION_SET_PASSWORD 0x4
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#define MANAGEMENT_ORB_FUNCTION_LOGOUT 0x7
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#define MANAGEMENT_ORB_FUNCTION_ABORT_TASK 0xb
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#define MANAGEMENT_ORB_FUNCTION_ABORT_TASK_SET 0xc
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#define MANAGEMENT_ORB_FUNCTION_LOGICAL_UNIT_RESET 0xe
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#define MANAGEMENT_ORB_FUNCTION_TARGET_RESET 0xf
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#define LOGIN_ORB_EXCLUSIVE(v) (((v) >> 28) & 0x01)
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#define LOGIN_ORB_RESERVED(v) (((v) >> 24) & 0x0f)
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#define LOGIN_ORB_RECONNECT(v) (((v) >> 20) & 0x0f)
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#define LOGIN_ORB_LUN(v) (((v) >> 0) & 0xffff)
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#define LOGIN_ORB_PASSWORD_LENGTH(v) (((v) >> 16) & 0xffff)
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#define LOGIN_ORB_RESPONSE_LENGTH(v) (((v) >> 0) & 0xffff)
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#define RECONNECT_ORB_LOGIN_ID(v) (((v) >> 0) & 0xffff)
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#define LOGOUT_ORB_LOGIN_ID(v) (((v) >> 0) & 0xffff)
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#define CMDBLK_ORB_DIRECTION(v) (((v) >> 27) & 0x01)
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#define CMDBLK_ORB_SPEED(v) (((v) >> 24) & 0x07)
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#define CMDBLK_ORB_MAX_PAYLOAD(v) (((v) >> 20) & 0x0f)
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#define CMDBLK_ORB_PG_TBL_PRESENT(v) (((v) >> 19) & 0x01)
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#define CMDBLK_ORB_PG_SIZE(v) (((v) >> 16) & 0x07)
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#define CMDBLK_ORB_DATA_SIZE(v) (((v) >> 0) & 0xffff)
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#define STATUS_BLOCK_SRC(v) (((v) & 0x03) << 30)
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#define STATUS_BLOCK_RESP(v) (((v) & 0x03) << 28)
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#define STATUS_BLOCK_DEAD(v) (((v) ? 1 : 0) << 27)
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#define STATUS_BLOCK_LEN(v) (((v) & 0x07) << 24)
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#define STATUS_BLOCK_SBP_STATUS(v) (((v) & 0xff) << 16)
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#define STATUS_BLOCK_ORB_OFFSET_HIGH(v) (((v) & 0xffff) << 0)
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#define STATUS_SRC_ORB_CONTINUING 0
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#define STATUS_SRC_ORB_FINISHED 1
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#define STATUS_SRC_UNSOLICITED 2
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#define STATUS_RESP_REQUEST_COMPLETE 0
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#define STATUS_RESP_TRANSPORT_FAILURE 1
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#define STATUS_RESP_ILLEGAL_REQUEST 2
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#define STATUS_RESP_VENDOR_DEPENDENT 3
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#define SBP_STATUS_OK 0
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#define SBP_STATUS_REQ_TYPE_NOTSUPP 1
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#define SBP_STATUS_SPEED_NOTSUPP 2
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#define SBP_STATUS_PAGE_SIZE_NOTSUPP 3
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#define SBP_STATUS_ACCESS_DENIED 4
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#define SBP_STATUS_LUN_NOTSUPP 5
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#define SBP_STATUS_PAYLOAD_TOO_SMALL 6
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/* 7 is reserved */
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#define SBP_STATUS_RESOURCES_UNAVAIL 8
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#define SBP_STATUS_FUNCTION_REJECTED 9
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#define SBP_STATUS_LOGIN_ID_UNKNOWN 10
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#define SBP_STATUS_DUMMY_ORB_COMPLETE 11
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#define SBP_STATUS_REQUEST_ABORTED 12
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#define SBP_STATUS_UNSPECIFIED_ERROR 0xff
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#define AGENT_STATE_RESET 0
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#define AGENT_STATE_ACTIVE 1
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#define AGENT_STATE_SUSPENDED 2
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#define AGENT_STATE_DEAD 3
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struct sbp2_pointer {
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__be32 high;
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__be32 low;
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};
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struct sbp_command_block_orb {
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struct sbp2_pointer next_orb;
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struct sbp2_pointer data_descriptor;
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__be32 misc;
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u8 command_block[12];
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};
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struct sbp_page_table_entry {
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__be16 segment_length;
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__be16 segment_base_hi;
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__be32 segment_base_lo;
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};
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struct sbp_management_orb {
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struct sbp2_pointer ptr1;
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struct sbp2_pointer ptr2;
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__be32 misc;
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__be32 length;
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struct sbp2_pointer status_fifo;
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};
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struct sbp_status_block {
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__be32 status;
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__be32 orb_low;
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u8 data[24];
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};
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struct sbp_login_response_block {
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__be32 misc;
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struct sbp2_pointer command_block_agent;
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__be32 reconnect_hold;
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};
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struct sbp_login_descriptor {
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struct sbp_session *sess;
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struct list_head link;
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u32 login_lun;
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u64 status_fifo_addr;
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int exclusive;
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u16 login_id;
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struct sbp_target_agent *tgt_agt;
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};
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struct sbp_session {
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spinlock_t lock;
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struct se_session *se_sess;
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struct list_head login_list;
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struct delayed_work maint_work;
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u64 guid; /* login_owner_EUI_64 */
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int node_id; /* login_owner_ID */
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struct fw_card *card;
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int generation;
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int speed;
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int reconnect_hold;
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u64 reconnect_expires;
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};
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struct sbp_tpg {
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/* Target portal group tag for TCM */
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u16 tport_tpgt;
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/* Pointer back to sbp_tport */
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struct sbp_tport *tport;
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/* Returned by sbp_make_tpg() */
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struct se_portal_group se_tpg;
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};
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struct sbp_tport {
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/* Target Unit Identifier (EUI-64) */
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u64 guid;
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/* Target port name */
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char tport_name[SBP_NAMELEN];
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/* Returned by sbp_make_tport() */
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struct se_wwn tport_wwn;
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struct sbp_tpg *tpg;
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/* FireWire unit directory */
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struct fw_descriptor unit_directory;
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/* SBP Management Agent */
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struct sbp_management_agent *mgt_agt;
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/* Parameters */
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int enable;
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s32 directory_id;
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int mgt_orb_timeout;
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int max_reconnect_timeout;
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int max_logins_per_lun;
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};
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static inline u64 sbp2_pointer_to_addr(const struct sbp2_pointer *ptr)
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{
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return (u64)(be32_to_cpu(ptr->high) & 0x0000ffff) << 32 |
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(be32_to_cpu(ptr->low) & 0xfffffffc);
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}
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static inline void addr_to_sbp2_pointer(u64 addr, struct sbp2_pointer *ptr)
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{
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ptr->high = cpu_to_be32(addr >> 32);
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ptr->low = cpu_to_be32(addr);
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}
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struct sbp_target_agent {
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spinlock_t lock;
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struct fw_address_handler handler;
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struct sbp_login_descriptor *login;
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int state;
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struct work_struct work;
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u64 orb_pointer;
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bool doorbell;
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};
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struct sbp_target_request {
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struct sbp_login_descriptor *login;
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u64 orb_pointer;
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struct sbp_command_block_orb orb;
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struct sbp_status_block status;
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struct work_struct work;
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struct se_cmd se_cmd;
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struct sbp_page_table_entry *pg_tbl;
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void *cmd_buf;
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unsigned char sense_buf[TRANSPORT_SENSE_BUFFER];
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};
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struct sbp_management_agent {
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spinlock_t lock;
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struct sbp_tport *tport;
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struct fw_address_handler handler;
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int state;
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struct work_struct work;
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u64 orb_offset;
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struct sbp_management_request *request;
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};
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struct sbp_management_request {
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struct sbp_management_orb orb;
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struct sbp_status_block status;
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struct fw_card *card;
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int generation;
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int node_addr;
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int speed;
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};
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#endif
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