qla2xxx: Change scsi host lookup method.

For target mode, when new scsi command arrive, driver first performs
a look up of the SCSI Host. The current look up method is based on
the ALPA portion of the NPort ID. For Cisco switch, the ALPA can
not be used as the index. Instead, the new search method is based
on the full value of the Nport_ID via btree lib.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 79 insertions, 13 deletions

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 38bdcd325fa4..7278e046bf87 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -187,21 +187,23 @@ static inline
 struct scsi_qla_host *qlt_find_host_by_d_id(struct scsi_qla_host *vha,
 	uint8_t *d_id)
 {
-	struct qla_hw_data *ha = vha->hw;
-	uint8_t vp_idx;
-
-	if ((vha->d_id.b.area != d_id[1]) || (vha->d_id.b.domain != d_id[0]))
-		return NULL;
+	struct scsi_qla_host *host;
+	uint32_t key = 0;
 
-	if (vha->d_id.b.al_pa == d_id[2])
+	if ((vha->d_id.b.area == d_id[1]) && (vha->d_id.b.domain == d_id[0]) &&
+	    (vha->d_id.b.al_pa == d_id[2]))
 		return vha;
 
-	BUG_ON(ha->tgt.tgt_vp_map == NULL);
-	vp_idx = ha->tgt.tgt_vp_map[d_id[2]].idx;
-	if (likely(test_bit(vp_idx, ha->vp_idx_map)))
-		return ha->tgt.tgt_vp_map[vp_idx].vha;
+	key  = (uint32_t)d_id[0] << 16;
+	key |= (uint32_t)d_id[1] <<  8;
+	key |= (uint32_t)d_id[2];
 
-	return NULL;
+	host = btree_lookup32(&vha->hw->tgt.host_map, key);
+	if (!host)
+		ql_dbg(ql_dbg_tgt_mgt, vha, 0xffff,
+			   "Unable to find host %06x\n", key);
+
+	return host;
 }
 
 static inline
@@ -6040,6 +6042,17 @@ int qlt_remove_target(struct qla_hw_data *ha, struct scsi_qla_host *vha)
 	return 0;
 }
 
+void qlt_remove_target_resources(struct qla_hw_data *ha)
+{
+	struct scsi_qla_host *node;
+	u32 key = 0;
+
+	btree_for_each_safe32(&ha->tgt.host_map, key, node)
+		btree_remove32(&ha->tgt.host_map, key);
+
+	btree_destroy32(&ha->tgt.host_map);
+}
+
 static void qlt_lport_dump(struct scsi_qla_host *vha, u64 wwpn,
 	unsigned char *b)
 {
@@ -6693,6 +6706,8 @@ qlt_modify_vp_config(struct scsi_qla_host *vha,
 void
 qlt_probe_one_stage1(struct scsi_qla_host *base_vha, struct qla_hw_data *ha)
 {
+	int rc;
+
 	if (!QLA_TGT_MODE_ENABLED())
 		return;
 
@@ -6712,6 +6727,13 @@ qlt_probe_one_stage1(struct scsi_qla_host *base_vha, struct qla_hw_data *ha)
 	    qlt_unknown_atio_work_fn);
 
 	qlt_clear_mode(base_vha);
+
+	rc = btree_init32(&ha->tgt.host_map);
+	if (rc)
+		ql_log(ql_log_info, base_vha, 0xffff,
+		    "Unable to initialize ha->host_map btree\n");
+
+	qlt_update_vp_map(base_vha, SET_VP_IDX);
 }
 
 irqreturn_t
@@ -6820,25 +6842,69 @@ qlt_mem_free(struct qla_hw_data *ha)
 void
 qlt_update_vp_map(struct scsi_qla_host *vha, int cmd)
 {
+	void *slot;
+	u32 key;
+	int rc;
+
 	if (!QLA_TGT_MODE_ENABLED())
 		return;
 
+	key = vha->d_id.b24;
+
 	switch (cmd) {
 	case SET_VP_IDX:
 		vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = vha;
 		break;
 	case SET_AL_PA:
-		vha->hw->tgt.tgt_vp_map[vha->d_id.b.al_pa].idx = vha->vp_idx;
+		slot = btree_lookup32(&vha->hw->tgt.host_map, key);
+		if (!slot) {
+			ql_dbg(ql_dbg_tgt_mgt, vha, 0xffff,
+			    "Save vha in host_map %p %06x\n", vha, key);
+			rc = btree_insert32(&vha->hw->tgt.host_map,
+				key, vha, GFP_ATOMIC);
+			if (rc)
+				ql_log(ql_log_info, vha, 0xffff,
+				    "Unable to insert s_id into host_map: %06x\n",
+				    key);
+			return;
+		}
+		ql_dbg(ql_dbg_tgt_mgt, vha, 0xffff,
+			"replace existing vha in host_map %p %06x\n", vha, key);
+		btree_update32(&vha->hw->tgt.host_map, key, vha);
 		break;
 	case RESET_VP_IDX:
 		vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = NULL;
 		break;
 	case RESET_AL_PA:
-		vha->hw->tgt.tgt_vp_map[vha->d_id.b.al_pa].idx = 0;
+		ql_dbg(ql_dbg_tgt_mgt, vha, 0xffff,
+		   "clear vha in host_map %p %06x\n", vha, key);
+		slot = btree_lookup32(&vha->hw->tgt.host_map, key);
+		if (slot)
+			btree_remove32(&vha->hw->tgt.host_map, key);
+		vha->d_id.b24 = 0;
 		break;
 	}
 }
 
+void qlt_update_host_map(struct scsi_qla_host *vha, port_id_t id)
+{
+	unsigned long flags;
+	struct qla_hw_data *ha = vha->hw;
+
+	if (!vha->d_id.b24) {
+		spin_lock_irqsave(&ha->vport_slock, flags);
+		vha->d_id = id;
+		qlt_update_vp_map(vha, SET_AL_PA);
+		spin_unlock_irqrestore(&ha->vport_slock, flags);
+	} else if (vha->d_id.b24 != id.b24) {
+		spin_lock_irqsave(&ha->vport_slock, flags);
+		qlt_update_vp_map(vha, RESET_AL_PA);
+		vha->d_id = id;
+		qlt_update_vp_map(vha, SET_AL_PA);
+		spin_unlock_irqrestore(&ha->vport_slock, flags);
+	}
+}
+
 static int __init qlt_parse_ini_mode(void)
 {
 	if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_EXCLUSIVE) == 0)