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target: Add transport_init_session_tags using per-cpu ida
This patch adds lib/idr.c based transport_init_session_tags() logic that allows fabric drivers to setup a per-cpu se_sess->sess_tag_pool and associated se_sess->sess_cmd_map for basic tagged pre-allocation of fabric descriptor sized memory. v5 changes: - Convert to percpu_ida.h include v4 changes: - Add transport_alloc_session_tags() for fabrics that need early transport_init_session() v3 changes: - Update to percpu-ida usage Cc: Kent Overstreet <kmo@daterainc.com> Cc: Asias He <asias@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -232,6 +232,50 @@ struct se_session *transport_init_session(void)
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}
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}
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EXPORT_SYMBOL(transport_init_session);
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EXPORT_SYMBOL(transport_init_session);
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int transport_alloc_session_tags(struct se_session *se_sess,
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unsigned int tag_num, unsigned int tag_size)
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{
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int rc;
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se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
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if (!se_sess->sess_cmd_map) {
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pr_err("Unable to allocate se_sess->sess_cmd_map\n");
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return -ENOMEM;
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}
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rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
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if (rc < 0) {
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pr_err("Unable to init se_sess->sess_tag_pool,"
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" tag_num: %u\n", tag_num);
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kfree(se_sess->sess_cmd_map);
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se_sess->sess_cmd_map = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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EXPORT_SYMBOL(transport_alloc_session_tags);
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struct se_session *transport_init_session_tags(unsigned int tag_num,
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unsigned int tag_size)
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{
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struct se_session *se_sess;
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int rc;
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se_sess = transport_init_session();
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if (IS_ERR(se_sess))
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return se_sess;
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rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
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if (rc < 0) {
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transport_free_session(se_sess);
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return ERR_PTR(-ENOMEM);
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}
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return se_sess;
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}
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EXPORT_SYMBOL(transport_init_session_tags);
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/*
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/*
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* Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
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* Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
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*/
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*/
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@ -367,6 +411,10 @@ EXPORT_SYMBOL(transport_deregister_session_configfs);
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void transport_free_session(struct se_session *se_sess)
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void transport_free_session(struct se_session *se_sess)
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{
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{
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if (se_sess->sess_cmd_map) {
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percpu_ida_destroy(&se_sess->sess_tag_pool);
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kfree(se_sess->sess_cmd_map);
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}
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kmem_cache_free(se_sess_cache, se_sess);
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kmem_cache_free(se_sess_cache, se_sess);
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}
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}
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EXPORT_SYMBOL(transport_free_session);
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EXPORT_SYMBOL(transport_free_session);
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@ -5,6 +5,7 @@
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#include <linux/configfs.h>
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#include <linux/configfs.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-mapping.h>
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#include <linux/blkdev.h>
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#include <linux/blkdev.h>
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#include <linux/percpu_ida.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_cmnd.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <net/tcp.h>
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@ -415,6 +416,8 @@ struct se_cmd {
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enum dma_data_direction data_direction;
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enum dma_data_direction data_direction;
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/* For SAM Task Attribute */
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/* For SAM Task Attribute */
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int sam_task_attr;
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int sam_task_attr;
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/* Used for se_sess->sess_tag_pool */
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unsigned int map_tag;
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/* Transport protocol dependent state, see transport_state_table */
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/* Transport protocol dependent state, see transport_state_table */
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enum transport_state_table t_state;
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enum transport_state_table t_state;
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unsigned cmd_wait_set:1;
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unsigned cmd_wait_set:1;
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@ -536,6 +539,8 @@ struct se_session {
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struct list_head sess_wait_list;
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struct list_head sess_wait_list;
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spinlock_t sess_cmd_lock;
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spinlock_t sess_cmd_lock;
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struct kref sess_kref;
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struct kref sess_kref;
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void *sess_cmd_map;
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struct percpu_ida sess_tag_pool;
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};
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};
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struct se_device;
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struct se_device;
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@ -84,6 +84,9 @@ struct target_core_fabric_ops {
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};
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};
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struct se_session *transport_init_session(void);
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struct se_session *transport_init_session(void);
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int transport_alloc_session_tags(struct se_session *, unsigned int,
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unsigned int);
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struct se_session *transport_init_session_tags(unsigned int, unsigned int);
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void __transport_register_session(struct se_portal_group *,
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void __transport_register_session(struct se_portal_group *,
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struct se_node_acl *, struct se_session *, void *);
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struct se_node_acl *, struct se_session *, void *);
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void transport_register_session(struct se_portal_group *,
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void transport_register_session(struct se_portal_group *,
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