504 lines
11 KiB
C
504 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2010 Cisco Systems, Inc.
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*/
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/* XXX TBD some includes may be extraneous */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/utsname.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/configfs.h>
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#include <linux/ctype.h>
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#include <linux/hash.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist.h>
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#include <linux/kref.h>
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#include <asm/unaligned.h>
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#include <scsi/libfc.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "tcm_fc.h"
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#define TFC_SESS_DBG(lport, fmt, args...) \
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pr_debug("host%u: rport %6.6x: " fmt, \
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(lport)->host->host_no, \
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(lport)->port_id, ##args )
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static void ft_sess_delete_all(struct ft_tport *);
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/*
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* Lookup or allocate target local port.
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* Caller holds ft_lport_lock.
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*/
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static struct ft_tport *ft_tport_get(struct fc_lport *lport)
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{
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struct ft_tpg *tpg;
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struct ft_tport *tport;
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int i;
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tport = rcu_dereference_protected(lport->prov[FC_TYPE_FCP],
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lockdep_is_held(&ft_lport_lock));
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if (tport && tport->tpg)
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return tport;
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tpg = ft_lport_find_tpg(lport);
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if (!tpg)
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return NULL;
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if (tport) {
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tport->tpg = tpg;
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tpg->tport = tport;
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return tport;
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}
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tport = kzalloc(sizeof(*tport), GFP_KERNEL);
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if (!tport)
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return NULL;
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tport->lport = lport;
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tport->tpg = tpg;
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tpg->tport = tport;
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for (i = 0; i < FT_SESS_HASH_SIZE; i++)
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INIT_HLIST_HEAD(&tport->hash[i]);
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rcu_assign_pointer(lport->prov[FC_TYPE_FCP], tport);
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return tport;
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}
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/*
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* Delete a target local port.
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* Caller holds ft_lport_lock.
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*/
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static void ft_tport_delete(struct ft_tport *tport)
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{
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struct fc_lport *lport;
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struct ft_tpg *tpg;
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ft_sess_delete_all(tport);
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lport = tport->lport;
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lport->service_params &= ~FCP_SPPF_TARG_FCN;
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BUG_ON(tport != lport->prov[FC_TYPE_FCP]);
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RCU_INIT_POINTER(lport->prov[FC_TYPE_FCP], NULL);
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tpg = tport->tpg;
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if (tpg) {
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tpg->tport = NULL;
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tport->tpg = NULL;
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}
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kfree_rcu(tport, rcu);
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}
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/*
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* Add local port.
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* Called thru fc_lport_iterate().
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*/
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void ft_lport_add(struct fc_lport *lport, void *arg)
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{
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mutex_lock(&ft_lport_lock);
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ft_tport_get(lport);
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lport->service_params |= FCP_SPPF_TARG_FCN;
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mutex_unlock(&ft_lport_lock);
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}
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/*
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* Delete local port.
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* Called thru fc_lport_iterate().
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*/
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void ft_lport_del(struct fc_lport *lport, void *arg)
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{
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struct ft_tport *tport;
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mutex_lock(&ft_lport_lock);
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tport = lport->prov[FC_TYPE_FCP];
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if (tport)
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ft_tport_delete(tport);
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mutex_unlock(&ft_lport_lock);
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}
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/*
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* Notification of local port change from libfc.
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* Create or delete local port and associated tport.
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*/
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int ft_lport_notify(struct notifier_block *nb, unsigned long event, void *arg)
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{
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struct fc_lport *lport = arg;
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switch (event) {
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case FC_LPORT_EV_ADD:
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ft_lport_add(lport, NULL);
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break;
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case FC_LPORT_EV_DEL:
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ft_lport_del(lport, NULL);
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break;
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}
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return NOTIFY_DONE;
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}
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/*
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* Hash function for FC_IDs.
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*/
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static u32 ft_sess_hash(u32 port_id)
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{
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return hash_32(port_id, FT_SESS_HASH_BITS);
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}
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/*
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* Find session in local port.
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* Sessions and hash lists are RCU-protected.
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* A reference is taken which must be eventually freed.
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*/
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static struct ft_sess *ft_sess_get(struct fc_lport *lport, u32 port_id)
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{
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struct ft_tport *tport;
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struct hlist_head *head;
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struct ft_sess *sess;
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char *reason = "no session created";
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rcu_read_lock();
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tport = rcu_dereference(lport->prov[FC_TYPE_FCP]);
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if (!tport) {
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reason = "not an FCP port";
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goto out;
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}
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head = &tport->hash[ft_sess_hash(port_id)];
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hlist_for_each_entry_rcu(sess, head, hash) {
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if (sess->port_id == port_id) {
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kref_get(&sess->kref);
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rcu_read_unlock();
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TFC_SESS_DBG(lport, "port_id %x found %p\n",
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port_id, sess);
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return sess;
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}
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}
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out:
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rcu_read_unlock();
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TFC_SESS_DBG(lport, "port_id %x not found, %s\n",
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port_id, reason);
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return NULL;
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}
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static int ft_sess_alloc_cb(struct se_portal_group *se_tpg,
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struct se_session *se_sess, void *p)
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{
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struct ft_sess *sess = p;
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struct ft_tport *tport = sess->tport;
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struct hlist_head *head = &tport->hash[ft_sess_hash(sess->port_id)];
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TFC_SESS_DBG(tport->lport, "port_id %x sess %p\n", sess->port_id, sess);
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hlist_add_head_rcu(&sess->hash, head);
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tport->sess_count++;
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return 0;
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}
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/*
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* Allocate session and enter it in the hash for the local port.
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* Caller holds ft_lport_lock.
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*/
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static struct ft_sess *ft_sess_create(struct ft_tport *tport, u32 port_id,
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struct fc_rport_priv *rdata)
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{
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struct se_portal_group *se_tpg = &tport->tpg->se_tpg;
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struct ft_sess *sess;
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struct hlist_head *head;
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unsigned char initiatorname[TRANSPORT_IQN_LEN];
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ft_format_wwn(&initiatorname[0], TRANSPORT_IQN_LEN, rdata->ids.port_name);
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head = &tport->hash[ft_sess_hash(port_id)];
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hlist_for_each_entry_rcu(sess, head, hash)
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if (sess->port_id == port_id)
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return sess;
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sess = kzalloc(sizeof(*sess), GFP_KERNEL);
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if (!sess)
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return ERR_PTR(-ENOMEM);
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kref_init(&sess->kref); /* ref for table entry */
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sess->tport = tport;
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sess->port_id = port_id;
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sess->se_sess = target_setup_session(se_tpg, TCM_FC_DEFAULT_TAGS,
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sizeof(struct ft_cmd),
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TARGET_PROT_NORMAL, &initiatorname[0],
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sess, ft_sess_alloc_cb);
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if (IS_ERR(sess->se_sess)) {
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int rc = PTR_ERR(sess->se_sess);
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kfree(sess);
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sess = ERR_PTR(rc);
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}
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return sess;
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}
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/*
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* Unhash the session.
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* Caller holds ft_lport_lock.
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*/
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static void ft_sess_unhash(struct ft_sess *sess)
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{
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struct ft_tport *tport = sess->tport;
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hlist_del_rcu(&sess->hash);
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BUG_ON(!tport->sess_count);
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tport->sess_count--;
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sess->port_id = -1;
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sess->params = 0;
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}
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/*
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* Delete session from hash.
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* Caller holds ft_lport_lock.
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*/
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static struct ft_sess *ft_sess_delete(struct ft_tport *tport, u32 port_id)
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{
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struct hlist_head *head;
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struct ft_sess *sess;
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head = &tport->hash[ft_sess_hash(port_id)];
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hlist_for_each_entry_rcu(sess, head, hash) {
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if (sess->port_id == port_id) {
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ft_sess_unhash(sess);
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return sess;
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}
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}
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return NULL;
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}
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static void ft_close_sess(struct ft_sess *sess)
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{
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target_stop_session(sess->se_sess);
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target_wait_for_sess_cmds(sess->se_sess);
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ft_sess_put(sess);
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}
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/*
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* Delete all sessions from tport.
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* Caller holds ft_lport_lock.
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*/
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static void ft_sess_delete_all(struct ft_tport *tport)
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{
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struct hlist_head *head;
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struct ft_sess *sess;
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for (head = tport->hash;
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head < &tport->hash[FT_SESS_HASH_SIZE]; head++) {
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hlist_for_each_entry_rcu(sess, head, hash) {
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ft_sess_unhash(sess);
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ft_close_sess(sess); /* release from table */
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}
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}
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}
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/*
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* TCM ops for sessions.
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*/
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/*
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* Remove session and send PRLO.
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* This is called when the ACL is being deleted or queue depth is changing.
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*/
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void ft_sess_close(struct se_session *se_sess)
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{
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struct ft_sess *sess = se_sess->fabric_sess_ptr;
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u32 port_id;
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mutex_lock(&ft_lport_lock);
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port_id = sess->port_id;
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if (port_id == -1) {
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mutex_unlock(&ft_lport_lock);
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return;
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}
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TFC_SESS_DBG(sess->tport->lport, "port_id %x close session\n", port_id);
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ft_sess_unhash(sess);
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mutex_unlock(&ft_lport_lock);
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ft_close_sess(sess);
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/* XXX Send LOGO or PRLO */
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synchronize_rcu(); /* let transport deregister happen */
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}
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u32 ft_sess_get_index(struct se_session *se_sess)
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{
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struct ft_sess *sess = se_sess->fabric_sess_ptr;
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return sess->port_id; /* XXX TBD probably not what is needed */
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}
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u32 ft_sess_get_port_name(struct se_session *se_sess,
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unsigned char *buf, u32 len)
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{
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struct ft_sess *sess = se_sess->fabric_sess_ptr;
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return ft_format_wwn(buf, len, sess->port_name);
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}
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/*
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* libfc ops involving sessions.
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*/
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static int ft_prli_locked(struct fc_rport_priv *rdata, u32 spp_len,
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const struct fc_els_spp *rspp, struct fc_els_spp *spp)
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{
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struct ft_tport *tport;
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struct ft_sess *sess;
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u32 fcp_parm;
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tport = ft_tport_get(rdata->local_port);
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if (!tport)
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goto not_target; /* not a target for this local port */
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if (!rspp)
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goto fill;
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if (rspp->spp_flags & (FC_SPP_OPA_VAL | FC_SPP_RPA_VAL))
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return FC_SPP_RESP_NO_PA;
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/*
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* If both target and initiator bits are off, the SPP is invalid.
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*/
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fcp_parm = ntohl(rspp->spp_params);
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if (!(fcp_parm & (FCP_SPPF_INIT_FCN | FCP_SPPF_TARG_FCN)))
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return FC_SPP_RESP_INVL;
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/*
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* Create session (image pair) only if requested by
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* EST_IMG_PAIR flag and if the requestor is an initiator.
|
||
|
|
*/
|
||
|
|
if (rspp->spp_flags & FC_SPP_EST_IMG_PAIR) {
|
||
|
|
spp->spp_flags |= FC_SPP_EST_IMG_PAIR;
|
||
|
|
if (!(fcp_parm & FCP_SPPF_INIT_FCN))
|
||
|
|
return FC_SPP_RESP_CONF;
|
||
|
|
sess = ft_sess_create(tport, rdata->ids.port_id, rdata);
|
||
|
|
if (IS_ERR(sess)) {
|
||
|
|
if (PTR_ERR(sess) == -EACCES) {
|
||
|
|
spp->spp_flags &= ~FC_SPP_EST_IMG_PAIR;
|
||
|
|
return FC_SPP_RESP_CONF;
|
||
|
|
} else
|
||
|
|
return FC_SPP_RESP_RES;
|
||
|
|
}
|
||
|
|
if (!sess->params)
|
||
|
|
rdata->prli_count++;
|
||
|
|
sess->params = fcp_parm;
|
||
|
|
sess->port_name = rdata->ids.port_name;
|
||
|
|
sess->max_frame = rdata->maxframe_size;
|
||
|
|
|
||
|
|
/* XXX TBD - clearing actions. unit attn, see 4.10 */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* OR in our service parameters with other provider (initiator), if any.
|
||
|
|
*/
|
||
|
|
fill:
|
||
|
|
fcp_parm = ntohl(spp->spp_params);
|
||
|
|
fcp_parm &= ~FCP_SPPF_RETRY;
|
||
|
|
spp->spp_params = htonl(fcp_parm | FCP_SPPF_TARG_FCN);
|
||
|
|
return FC_SPP_RESP_ACK;
|
||
|
|
|
||
|
|
not_target:
|
||
|
|
fcp_parm = ntohl(spp->spp_params);
|
||
|
|
fcp_parm &= ~FCP_SPPF_TARG_FCN;
|
||
|
|
spp->spp_params = htonl(fcp_parm);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* ft_prli() - Handle incoming or outgoing PRLI for the FCP target
|
||
|
|
* @rdata: remote port private
|
||
|
|
* @spp_len: service parameter page length
|
||
|
|
* @rspp: received service parameter page (NULL for outgoing PRLI)
|
||
|
|
* @spp: response service parameter page
|
||
|
|
*
|
||
|
|
* Returns spp response code.
|
||
|
|
*/
|
||
|
|
static int ft_prli(struct fc_rport_priv *rdata, u32 spp_len,
|
||
|
|
const struct fc_els_spp *rspp, struct fc_els_spp *spp)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mutex_lock(&ft_lport_lock);
|
||
|
|
ret = ft_prli_locked(rdata, spp_len, rspp, spp);
|
||
|
|
mutex_unlock(&ft_lport_lock);
|
||
|
|
TFC_SESS_DBG(rdata->local_port, "port_id %x flags %x ret %x\n",
|
||
|
|
rdata->ids.port_id, rspp ? rspp->spp_flags : 0, ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ft_sess_free(struct kref *kref)
|
||
|
|
{
|
||
|
|
struct ft_sess *sess = container_of(kref, struct ft_sess, kref);
|
||
|
|
|
||
|
|
target_remove_session(sess->se_sess);
|
||
|
|
kfree_rcu(sess, rcu);
|
||
|
|
}
|
||
|
|
|
||
|
|
void ft_sess_put(struct ft_sess *sess)
|
||
|
|
{
|
||
|
|
int sess_held = kref_read(&sess->kref);
|
||
|
|
|
||
|
|
BUG_ON(!sess_held);
|
||
|
|
kref_put(&sess->kref, ft_sess_free);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void ft_prlo(struct fc_rport_priv *rdata)
|
||
|
|
{
|
||
|
|
struct ft_sess *sess;
|
||
|
|
struct ft_tport *tport;
|
||
|
|
|
||
|
|
mutex_lock(&ft_lport_lock);
|
||
|
|
tport = rcu_dereference_protected(rdata->local_port->prov[FC_TYPE_FCP],
|
||
|
|
lockdep_is_held(&ft_lport_lock));
|
||
|
|
|
||
|
|
if (!tport) {
|
||
|
|
mutex_unlock(&ft_lport_lock);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
sess = ft_sess_delete(tport, rdata->ids.port_id);
|
||
|
|
if (!sess) {
|
||
|
|
mutex_unlock(&ft_lport_lock);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
mutex_unlock(&ft_lport_lock);
|
||
|
|
ft_close_sess(sess); /* release from table */
|
||
|
|
rdata->prli_count--;
|
||
|
|
/* XXX TBD - clearing actions. unit attn, see 4.10 */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Handle incoming FCP request.
|
||
|
|
* Caller has verified that the frame is type FCP.
|
||
|
|
*/
|
||
|
|
static void ft_recv(struct fc_lport *lport, struct fc_frame *fp)
|
||
|
|
{
|
||
|
|
struct ft_sess *sess;
|
||
|
|
u32 sid = fc_frame_sid(fp);
|
||
|
|
|
||
|
|
TFC_SESS_DBG(lport, "recv sid %x\n", sid);
|
||
|
|
|
||
|
|
sess = ft_sess_get(lport, sid);
|
||
|
|
if (!sess) {
|
||
|
|
TFC_SESS_DBG(lport, "sid %x sess lookup failed\n", sid);
|
||
|
|
/* TBD XXX - if FCP_CMND, send PRLO */
|
||
|
|
fc_frame_free(fp);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
ft_recv_req(sess, fp); /* must do ft_sess_put() */
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Provider ops for libfc.
|
||
|
|
*/
|
||
|
|
struct fc4_prov ft_prov = {
|
||
|
|
.prli = ft_prli,
|
||
|
|
.prlo = ft_prlo,
|
||
|
|
.recv = ft_recv,
|
||
|
|
.module = THIS_MODULE,
|
||
|
|
};
|