e48354ce07
The Linux-iSCSI.org target module is a full featured in-kernel software implementation of iSCSI target mode (RFC-3720) for the current WIP mainline target v4.1 infrastructure code for the v3.1 kernel. More information can be found here: http://linux-iscsi.org/wiki/ISCSI This includes support for: * RFC-3720 defined request / response state machines and support for all defined iSCSI operation codes from Section 10.2.1.2 using libiscsi include/scsi/iscsi_proto.h PDU definitions * Target v4.1 compatible control plane using the generic layout in target_core_fabric_configfs.c and fabric dependent attributes within /sys/kernel/config/target/iscsi/ subdirectories. * Target v4.1 compatible iSCSI statistics based on RFC-4544 (iSCSI MIBS) * Support for IPv6 and IPv4 network portals in M:N mapping to TPGs * iSCSI Error Recovery Hierarchy support * Per iSCSI connection RX/TX thread pair scheduling affinity * crc32c + crc32c_intel SSEv4 instruction offload support using libcrypto * CHAP Authentication support using libcrypto * Conversion to use internal SGl allocation with iscsit_alloc_buffs() -> transport_generic_map_mem_to_cmd() (nab: Fix iscsi_proto.h struct scsi_lun usage from linux-next in commit: iscsi: Use struct scsi_lun in iscsi structs instead of u8[8]) (nab: Fix 32-bit compile warnings) Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Andy Grover <agrover@redhat.com> Acked-by: Roland Dreier <roland@kernel.org> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
89 lines
3 KiB
C
89 lines
3 KiB
C
#ifndef ISCSI_THREAD_QUEUE_H
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#define ISCSI_THREAD_QUEUE_H
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/*
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* Defines for thread sets.
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*/
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extern int iscsi_thread_set_force_reinstatement(struct iscsi_conn *);
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extern void iscsi_add_ts_to_inactive_list(struct iscsi_thread_set *);
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extern int iscsi_allocate_thread_sets(u32);
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extern void iscsi_deallocate_thread_sets(void);
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extern void iscsi_activate_thread_set(struct iscsi_conn *, struct iscsi_thread_set *);
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extern struct iscsi_thread_set *iscsi_get_thread_set(void);
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extern void iscsi_set_thread_clear(struct iscsi_conn *, u8);
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extern void iscsi_set_thread_set_signal(struct iscsi_conn *, u8);
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extern int iscsi_release_thread_set(struct iscsi_conn *);
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extern struct iscsi_conn *iscsi_rx_thread_pre_handler(struct iscsi_thread_set *);
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extern struct iscsi_conn *iscsi_tx_thread_pre_handler(struct iscsi_thread_set *);
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extern int iscsi_thread_set_init(void);
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extern void iscsi_thread_set_free(void);
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extern int iscsi_target_tx_thread(void *);
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extern int iscsi_target_rx_thread(void *);
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#define TARGET_THREAD_SET_COUNT 4
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#define ISCSI_RX_THREAD 1
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#define ISCSI_TX_THREAD 2
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#define ISCSI_RX_THREAD_NAME "iscsi_trx"
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#define ISCSI_TX_THREAD_NAME "iscsi_ttx"
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#define ISCSI_BLOCK_RX_THREAD 0x1
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#define ISCSI_BLOCK_TX_THREAD 0x2
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#define ISCSI_CLEAR_RX_THREAD 0x1
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#define ISCSI_CLEAR_TX_THREAD 0x2
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#define ISCSI_SIGNAL_RX_THREAD 0x1
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#define ISCSI_SIGNAL_TX_THREAD 0x2
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/* struct iscsi_thread_set->status */
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#define ISCSI_THREAD_SET_FREE 1
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#define ISCSI_THREAD_SET_ACTIVE 2
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#define ISCSI_THREAD_SET_DIE 3
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#define ISCSI_THREAD_SET_RESET 4
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#define ISCSI_THREAD_SET_DEALLOCATE_THREADS 5
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/* By default allow a maximum of 32K iSCSI connections */
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#define ISCSI_TS_BITMAP_BITS 32768
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struct iscsi_thread_set {
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/* flags used for blocking and restarting sets */
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int blocked_threads;
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/* flag for creating threads */
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int create_threads;
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/* flag for delaying readding to inactive list */
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int delay_inactive;
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/* status for thread set */
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int status;
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/* which threads have had signals sent */
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int signal_sent;
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/* flag for which threads exited first */
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int thread_clear;
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/* Active threads in the thread set */
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int thread_count;
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/* Unique thread ID */
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u32 thread_id;
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/* pointer to connection if set is active */
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struct iscsi_conn *conn;
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/* used for controlling ts state accesses */
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spinlock_t ts_state_lock;
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/* Used for rx side post startup */
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struct completion rx_post_start_comp;
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/* Used for tx side post startup */
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struct completion tx_post_start_comp;
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/* used for restarting thread queue */
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struct completion rx_restart_comp;
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/* used for restarting thread queue */
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struct completion tx_restart_comp;
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/* used for normal unused blocking */
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struct completion rx_start_comp;
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/* used for normal unused blocking */
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struct completion tx_start_comp;
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/* OS descriptor for rx thread */
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struct task_struct *rx_thread;
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/* OS descriptor for tx thread */
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struct task_struct *tx_thread;
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/* struct iscsi_thread_set in list list head*/
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struct list_head ts_list;
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};
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#endif /*** ISCSI_THREAD_QUEUE_H ***/
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