Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 18/24] qla2xxx: Update target lookup session tables when a target session changes | Date | Fri, 2 Nov 2012 10:07:06 -0700 |
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3.6-stable review patch. If anyone has any objections, please let me know.
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From: Roland Dreier <roland@purestorage.com>
commit c8292d1da53fa60c7516ab03a9d83f7ea266d335 upstream.
It is possible for the target code to change the loop_id or s_id of a target session in reaction to an FC fabric change. However, the session structures are stored in tables that are indexed by these two keys, and if we just change the session structure but leave the pointers to it in the old places in the table, havoc can ensue. For example, a new session might come along that should go in the old slot in the table and overwrite the old session pointer.
To handle this, add a new tgt_ops->update_sess() method that also updates the "by loop_id" and "by s_id" lookup tables when a session changes, so that the keys where a session pointer is stored in these tables always matches the keys in the session structure itself.
(nab: Drop unnecessary double inversion with FCF_CONF_COMP_SUPPORTED usage)
Signed-off-by: Roland Dreier <roland@purestorage.com> Cc: Chad Dupuis <chad.dupuis@qlogic.com> Cc: Arun Easi <arun.easi@qlogic.com> Cc: Saurav Kashyap <saurav.kashyap@qlogic.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/scsi/qla2xxx/qla_target.c | 25 +++++------- drivers/scsi/qla2xxx/qla_target.h | 1 drivers/scsi/qla2xxx/tcm_qla2xxx.c | 73 +++++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+), 14 deletions(-)
--- a/drivers/scsi/qla2xxx/qla_target.c +++ b/drivers/scsi/qla2xxx/qla_target.c @@ -557,6 +557,7 @@ static bool qlt_check_fcport_exist(struc int pmap_len; fc_port_t *fcport; int global_resets; + unsigned long flags; retry: global_resets = atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count); @@ -625,10 +626,10 @@ retry: sess->s_id.b.area, sess->loop_id, fcport->d_id.b.domain, fcport->d_id.b.al_pa, fcport->d_id.b.area, fcport->loop_id); - sess->s_id = fcport->d_id; - sess->loop_id = fcport->loop_id; - sess->conf_compl_supported = !!(fcport->flags & - FCF_CONF_COMP_SUPPORTED); + spin_lock_irqsave(&ha->hardware_lock, flags); + ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id, + (fcport->flags & FCF_CONF_COMP_SUPPORTED)); + spin_unlock_irqrestore(&ha->hardware_lock, flags); res = true; @@ -740,10 +741,9 @@ static struct qla_tgt_sess *qlt_create_s qlt_undelete_sess(sess); kref_get(&sess->se_sess->sess_kref); - sess->s_id = fcport->d_id; - sess->loop_id = fcport->loop_id; - sess->conf_compl_supported = !!(fcport->flags & - FCF_CONF_COMP_SUPPORTED); + ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id, + (fcport->flags & FCF_CONF_COMP_SUPPORTED)); + if (sess->local && !local) sess->local = 0; spin_unlock_irqrestore(&ha->hardware_lock, flags); @@ -796,8 +796,7 @@ static struct qla_tgt_sess *qlt_create_s */ kref_get(&sess->se_sess->sess_kref); - sess->conf_compl_supported = !!(fcport->flags & - FCF_CONF_COMP_SUPPORTED); + sess->conf_compl_supported = (fcport->flags & FCF_CONF_COMP_SUPPORTED); BUILD_BUG_ON(sizeof(sess->port_name) != sizeof(fcport->port_name)); memcpy(sess->port_name, fcport->port_name, sizeof(sess->port_name)); @@ -869,10 +868,8 @@ void qlt_fc_port_added(struct scsi_qla_h ql_dbg(ql_dbg_tgt_mgt, vha, 0xf007, "Reappeared sess %p\n", sess); } - sess->s_id = fcport->d_id; - sess->loop_id = fcport->loop_id; - sess->conf_compl_supported = !!(fcport->flags & - FCF_CONF_COMP_SUPPORTED); + ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id, + (fcport->flags & FCF_CONF_COMP_SUPPORTED)); } if (sess && sess->local) { --- a/drivers/scsi/qla2xxx/qla_target.h +++ b/drivers/scsi/qla2xxx/qla_target.h @@ -648,6 +648,7 @@ struct qla_tgt_func_tmpl { int (*check_initiator_node_acl)(struct scsi_qla_host *, unsigned char *, void *, uint8_t *, uint16_t); + void (*update_sess)(struct qla_tgt_sess *, port_id_t, uint16_t, bool); struct qla_tgt_sess *(*find_sess_by_loop_id)(struct scsi_qla_host *, const uint16_t); struct qla_tgt_sess *(*find_sess_by_s_id)(struct scsi_qla_host *, --- a/drivers/scsi/qla2xxx/tcm_qla2xxx.c +++ b/drivers/scsi/qla2xxx/tcm_qla2xxx.c @@ -1468,6 +1468,78 @@ static int tcm_qla2xxx_check_initiator_n return 0; } +static void tcm_qla2xxx_update_sess(struct qla_tgt_sess *sess, port_id_t s_id, + uint16_t loop_id, bool conf_compl_supported) +{ + struct qla_tgt *tgt = sess->tgt; + struct qla_hw_data *ha = tgt->ha; + struct tcm_qla2xxx_lport *lport = ha->tgt.target_lport_ptr; + struct se_node_acl *se_nacl = sess->se_sess->se_node_acl; + struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl, + struct tcm_qla2xxx_nacl, se_node_acl); + u32 key; + + + if (sess->loop_id != loop_id || sess->s_id.b24 != s_id.b24) + pr_info("Updating session %p from port %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x loop_id %d -> %d s_id %x:%x:%x -> %x:%x:%x\n", + sess, + sess->port_name[0], sess->port_name[1], + sess->port_name[2], sess->port_name[3], + sess->port_name[4], sess->port_name[5], + sess->port_name[6], sess->port_name[7], + sess->loop_id, loop_id, + sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa, + s_id.b.domain, s_id.b.area, s_id.b.al_pa); + + if (sess->loop_id != loop_id) { + /* + * Because we can shuffle loop IDs around and we + * update different sessions non-atomically, we might + * have overwritten this session's old loop ID + * already, and we might end up overwriting some other + * session that will be updated later. So we have to + * be extra careful and we can't warn about those things... + */ + if (lport->lport_loopid_map[sess->loop_id].se_nacl == se_nacl) + lport->lport_loopid_map[sess->loop_id].se_nacl = NULL; + + lport->lport_loopid_map[loop_id].se_nacl = se_nacl; + + sess->loop_id = loop_id; + } + + if (sess->s_id.b24 != s_id.b24) { + key = (((u32) sess->s_id.b.domain << 16) | + ((u32) sess->s_id.b.area << 8) | + ((u32) sess->s_id.b.al_pa)); + + if (btree_lookup32(&lport->lport_fcport_map, key)) + WARN(btree_remove32(&lport->lport_fcport_map, key) != se_nacl, + "Found wrong se_nacl when updating s_id %x:%x:%x\n", + sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa); + else + WARN(1, "No lport_fcport_map entry for s_id %x:%x:%x\n", + sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa); + + key = (((u32) s_id.b.domain << 16) | + ((u32) s_id.b.area << 8) | + ((u32) s_id.b.al_pa)); + + if (btree_lookup32(&lport->lport_fcport_map, key)) { + WARN(1, "Already have lport_fcport_map entry for s_id %x:%x:%x\n", + s_id.b.domain, s_id.b.area, s_id.b.al_pa); + btree_update32(&lport->lport_fcport_map, key, se_nacl); + } else { + btree_insert32(&lport->lport_fcport_map, key, se_nacl, GFP_ATOMIC); + } + + sess->s_id = s_id; + nacl->nport_id = key; + } + + sess->conf_compl_supported = conf_compl_supported; +} + /* * Calls into tcm_qla2xxx used by qla2xxx LLD I/O path. */ @@ -1478,6 +1550,7 @@ static struct qla_tgt_func_tmpl tcm_qla2 .free_cmd = tcm_qla2xxx_free_cmd, .free_mcmd = tcm_qla2xxx_free_mcmd, .free_session = tcm_qla2xxx_free_session, + .update_sess = tcm_qla2xxx_update_sess, .check_initiator_node_acl = tcm_qla2xxx_check_initiator_node_acl, .find_sess_by_s_id = tcm_qla2xxx_find_sess_by_s_id, .find_sess_by_loop_id = tcm_qla2xxx_find_sess_by_loop_id,
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