qla2xxx: Delete session if initiator is gone from FW

1. Initiator A is logged in with fc_id(1)/loop_id(1)
2. Initiator A re-logs in with fc_id(2)/loop_id(2)
3. Part of old session deletion async logoout for 1/1 is queued
4. Initiator B logs in with fc_id(1)/loop_id(1), starts
   passing data and creates session.
5. Async logo from 3 is processed by DPC and sent to FW

Now initiator B has the session but is logged out from FW.

This condition is detected first with CTIO error 29 at which
point we should delete current session. During session
deletion we will send LOGO to initiator to force re-login.

Under rare circumstances initiator might be logged out of FW,
not have driver session, but still think it's logged in.
E.g. the above sequence plus session deletion due to re-config.
Incoming commands will fail to create local session because
initiator is not found in FW. In this case we also issue LOGO
to initiator to force him re-login.

Finally this patch fixes exchange leak when commands where
received in logged out state. In this case loop_id must be
set to FFFF when corresponding exchange is terminated. The
patch modifies exchange termination to always use FFFF,
since in certain scenarios it's impossible to tell whether
command was received in logged in or logged out state.

Signed-off-by: Alexei Potashnik <alexei@purestorage.com>
Acked-by: Quinn Tran <quinn.tran@qlogic.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 83d2251eefe4f07c034c4694b86a11392050389c..495a0aa26757bfb54b378e86419ff963f82f578e 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -3652,6 +3652,8 @@ typedef struct scsi_qla_host {
        atomic_t                generation_tick;
        /* Time when global fcport update has been scheduled */
        int                     total_fcport_update_gen;
+       /* List of pending LOGOs, protected by tgt_mutex */
+       struct list_head        logo_list;
 
        uint32_t        vp_abort_cnt;
 

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 266dd746841adfd561b31f668aa9c519e52d612f..cb0784a8705e88507ba478e26c52899ffe69edb1 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -3920,6 +3920,7 @@ struct scsi_qla_host *qla2x00_create_host(struct scsi_host_template *sht,
        INIT_LIST_HEAD(&vha->list);
        INIT_LIST_HEAD(&vha->qla_cmd_list);
        INIT_LIST_HEAD(&vha->qla_sess_op_cmd_list);
+       INIT_LIST_HEAD(&vha->logo_list);
 
        spin_lock_init(&vha->work_lock);
        spin_lock_init(&vha->cmd_list_lock);

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 661124afae90f0011071d9f35cb765217fe6d146..5ef9d4c21e3815391229501541be665c9a4e72aa 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -389,6 +389,52 @@ void qlt_response_pkt_all_vps(struct scsi_qla_host *vha, response_t *pkt)
 
 }
 
+typedef struct {
+       /* These fields must be initialized by the caller */
+       port_id_t id;
+       /*
+        * number of cmds dropped while we were waiting for
+        * initiator to ack LOGO initialize to 1 if LOGO is
+        * triggered by a command, otherwise, to 0
+        */
+       int cmd_count;
+
+       /* These fields are used by callee */
+       struct list_head list;
+} qlt_port_logo_t;
+
+static void
+qlt_send_first_logo(struct scsi_qla_host *vha, qlt_port_logo_t *logo)
+{
+       qlt_port_logo_t *tmp;
+       int res;
+
+       mutex_lock(&vha->vha_tgt.tgt_mutex);
+
+       list_for_each_entry(tmp, &vha->logo_list, list) {
+               if (tmp->id.b24 == logo->id.b24) {
+                       tmp->cmd_count += logo->cmd_count;
+                       mutex_unlock(&vha->vha_tgt.tgt_mutex);
+                       return;
+               }
+       }
+
+       list_add_tail(&logo->list, &vha->logo_list);
+
+       mutex_unlock(&vha->vha_tgt.tgt_mutex);
+
+       res = qla24xx_els_dcmd_iocb(vha, ELS_DCMD_LOGO, logo->id);
+
+       mutex_lock(&vha->vha_tgt.tgt_mutex);
+       list_del(&logo->list);
+       mutex_unlock(&vha->vha_tgt.tgt_mutex);
+
+       dev_info(&vha->hw->pdev->dev,
+                "Finished LOGO to %02x:%02x:%02x, dropped %d cmds, res = %#x\n",
+                logo->id.b.domain, logo->id.b.area, logo->id.b.al_pa,
+                logo->cmd_count, res);
+}
+
 static void qlt_free_session_done(struct work_struct *work)
 {
        struct qla_tgt_sess *sess = container_of(work, struct qla_tgt_sess,
@@ -402,14 +448,21 @@ static void qlt_free_session_done(struct work_struct *work)
 
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf084,
                "%s: se_sess %p / sess %p from port %8phC loop_id %#04x"
-               " s_id %02x:%02x:%02x logout %d keep %d plogi %d\n",
+               " s_id %02x:%02x:%02x logout %d keep %d plogi %d els_logo %d\n",
                __func__, sess->se_sess, sess, sess->port_name, sess->loop_id,
                sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa,
                sess->logout_on_delete, sess->keep_nport_handle,
-               sess->plogi_ack_needed);
+               sess->plogi_ack_needed, sess->send_els_logo);
 
        BUG_ON(!tgt);
 
+       if (sess->send_els_logo) {
+               qlt_port_logo_t logo;
+               logo.id = sess->s_id;
+               logo.cmd_count = 0;
+               qlt_send_first_logo(vha, &logo);
+       }
+
        if (sess->logout_on_delete) {
                int rc;
 
@@ -636,12 +689,12 @@ static int qla24xx_get_loop_id(struct scsi_qla_host *vha, const uint8_t *s_id,
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf045,
                    "qla_target(%d): get_id_list() failed: %x\n",
                    vha->vp_idx, rc);
-               res = -1;
+               res = -EBUSY;
                goto out_free_id_list;
        }
 
        id_iter = (char *)gid_list;
-       res = -1;
+       res = -ENOENT;
        for (i = 0; i < entries; i++) {
                struct gid_list_info *gid = (struct gid_list_info *)id_iter;
                if ((gid->al_pa == s_id[2]) &&
@@ -2968,7 +3021,7 @@ static int __qlt_send_term_exchange(struct scsi_qla_host *vha,
 
        ctio24 = (struct ctio7_to_24xx *)pkt;
        ctio24->entry_type = CTIO_TYPE7;
-       ctio24->nport_handle = cmd ? cmd->loop_id : CTIO7_NHANDLE_UNRECOGNIZED;
+       ctio24->nport_handle = CTIO7_NHANDLE_UNRECOGNIZED;
        ctio24->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
        ctio24->vp_index = vha->vp_idx;
        ctio24->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
@@ -3404,13 +3457,26 @@ static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
 
                case CTIO_PORT_LOGGED_OUT:
                case CTIO_PORT_UNAVAILABLE:
+               {
+                       bool logged_out = (status & 0xFFFF);
                        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf059,
-                           "qla_target(%d): CTIO with PORT LOGGED "
-                           "OUT (29) or PORT UNAVAILABLE (28) status %x "
+                           "qla_target(%d): CTIO with %s status %x "
                            "received (state %x, se_cmd %p)\n", vha->vp_idx,
+                           (logged_out == CTIO_PORT_LOGGED_OUT) ?
+                           "PORT LOGGED OUT" : "PORT UNAVAILABLE",
                            status, cmd->state, se_cmd);
-                       break;
 
+                       if (logged_out && cmd->sess) {
+                               /*
+                                * Session is already logged out, but we need
+                                * to notify initiator, who's not aware of this
+                                */
+                               cmd->sess->logout_on_delete = 0;
+                               cmd->sess->send_els_logo = 1;
+                               qlt_schedule_sess_for_deletion(cmd->sess, true);
+                       }
+                       break;
+               }
                case CTIO_SRR_RECEIVED:
                        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05a,
                            "qla_target(%d): CTIO with SRR_RECEIVED"
@@ -3698,10 +3764,8 @@ static void qlt_create_sess_from_atio(struct work_struct *work)
                goto out_term;
        }
 
-       mutex_lock(&vha->vha_tgt.tgt_mutex);
        sess = qlt_make_local_sess(vha, s_id);
        /* sess has an extra creation ref. */
-       mutex_unlock(&vha->vha_tgt.tgt_mutex);
 
        if (!sess)
                goto out_term;
@@ -5541,12 +5605,16 @@ static struct qla_tgt_sess *qlt_make_local_sess(struct scsi_qla_host *vha,
        int rc, global_resets;
        uint16_t loop_id = 0;
 
+       mutex_lock(&vha->vha_tgt.tgt_mutex);
+
 retry:
        global_resets =
            atomic_read(&vha->vha_tgt.qla_tgt->tgt_global_resets_count);
 
        rc = qla24xx_get_loop_id(vha, s_id, &loop_id);
        if (rc != 0) {
+               mutex_unlock(&vha->vha_tgt.tgt_mutex);
+
                if ((s_id[0] == 0xFF) &&
                    (s_id[1] == 0xFC)) {
                        /*
@@ -5557,17 +5625,27 @@ retry:
                            "Unable to find initiator with S_ID %x:%x:%x",
                            s_id[0], s_id[1], s_id[2]);
                } else
-                       ql_dbg(ql_dbg_tgt_mgt, vha, 0xf071,
+                       ql_log(ql_log_info, vha, 0xf071,
                            "qla_target(%d): Unable to find "
                            "initiator with S_ID %x:%x:%x",
                            vha->vp_idx, s_id[0], s_id[1],
                            s_id[2]);
+
+               if (rc == -ENOENT) {
+                       qlt_port_logo_t logo;
+                       sid_to_portid(s_id, &logo.id);
+                       logo.cmd_count = 1;
+                       qlt_send_first_logo(vha, &logo);
+               }
+
                return NULL;
        }
 
        fcport = qlt_get_port_database(vha, loop_id);
-       if (!fcport)
+       if (!fcport) {
+               mutex_unlock(&vha->vha_tgt.tgt_mutex);
                return NULL;
+       }
 
        if (global_resets !=
            atomic_read(&vha->vha_tgt.qla_tgt->tgt_global_resets_count)) {
@@ -5582,6 +5660,8 @@ retry:
 
        sess = qlt_create_sess(vha, fcport, true);
 
+       mutex_unlock(&vha->vha_tgt.tgt_mutex);
+
        kfree(fcport);
        return sess;
 }
@@ -5611,10 +5691,8 @@ static void qlt_abort_work(struct qla_tgt *tgt,
        if (!sess) {
                spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
-               mutex_lock(&vha->vha_tgt.tgt_mutex);
                sess = qlt_make_local_sess(vha, s_id);
                /* sess has got an extra creation ref */
-               mutex_unlock(&vha->vha_tgt.tgt_mutex);
 
                spin_lock_irqsave(&ha->hardware_lock, flags);
                if (!sess)
@@ -5670,10 +5748,8 @@ static void qlt_tmr_work(struct qla_tgt *tgt,
        if (!sess) {
                spin_unlock_irqrestore(&ha->hardware_lock, flags);
 
-               mutex_lock(&vha->vha_tgt.tgt_mutex);
                sess = qlt_make_local_sess(vha, s_id);
                /* sess has got an extra creation ref */
-               mutex_unlock(&vha->vha_tgt.tgt_mutex);
 
                spin_lock_irqsave(&ha->hardware_lock, flags);
                if (!sess)

diff --git a/drivers/scsi/qla2xxx/qla_target.h b/drivers/scsi/qla2xxx/qla_target.h
index bca584ae45b7eccc3da35a11c9583c324524a802..e316d42b46fa1d23fc6d200e4e57a8274eeaed24 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.h
+++ b/drivers/scsi/qla2xxx/qla_target.h
@@ -909,6 +909,7 @@ struct qla_tgt_sess {
        unsigned int logout_on_delete:1;
        unsigned int plogi_ack_needed:1;
        unsigned int keep_nport_handle:1;
+       unsigned int send_els_logo:1;
 
        unsigned char logout_completed;
 
@@ -1120,6 +1121,14 @@ static inline uint32_t sid_to_key(const uint8_t *s_id)
        return key;
 }
 
+static inline void sid_to_portid(const uint8_t *s_id, port_id_t *p)
+{
+       memset(p, 0, sizeof(*p));
+       p->b.domain = s_id[0];
+       p->b.area = s_id[1];
+       p->b.al_pa = s_id[2];
+}
+
 /*
  * Exported symbols from qla_target.c LLD logic used by qla2xxx code..
  */