[PATCH 28/43] qla2xxx: Remove session creation redundant code

Himanshu Madhani
2017-12-20T06:57:21Z

Current code creates a session when a new port is
discovered, and a PLOGI/PRLI is received. There is
no need to create session when command has arrived.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
---
drivers/scsi/qla2xxx/qla_target.c | 122 ++------------------------------------
1 file changed, 5 insertions(+), 117 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 93910e56643d..598ec3481a8c 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -2016,15 +2016,10 @@ static void qlt_24xx_handle_abts(struct scsi_qla_host *vha,
ql_dbg(ql_dbg_tgt_mgt, vha, 0xf012,
"qla_target(%d): task abort for non-existant session\n",
vha->vp_idx);
- rc = qlt_sched_sess_work(vha->vha_tgt.qla_tgt,
- QLA_TGT_SESS_WORK_ABORT, abts, sizeof(*abts));
-
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);

- if (rc != 0) {
- qlt_24xx_send_abts_resp(ha->base_qpair, abts,
- FCP_TMF_REJECTED, false);
- }
+ qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
+ false);
return;
}
spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
@@ -4265,87 +4260,6 @@ static struct qla_tgt_cmd *qlt_get_tag(scsi_qla_host_t *vha,
return cmd;
}

-static void qlt_create_sess_from_atio(struct work_struct *work)
-{
- struct qla_tgt_sess_op *op = container_of(work,
- struct qla_tgt_sess_op, work);
- scsi_qla_host_t *vha = op->vha;
- struct qla_hw_data *ha = vha->hw;
- struct fc_port *sess;
- struct qla_tgt_cmd *cmd;
- unsigned long flags;
- uint8_t *s_id = op->atio.u.isp24.fcp_hdr.s_id;
-
- spin_lock_irqsave(&vha->cmd_list_lock, flags);
- list_del(&op->cmd_list);
- spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
-
- if (op->aborted) {
- ql_dbg(ql_dbg_tgt_mgt, vha, 0xf083,
- "sess_op with tag %u is aborted\n",
- op->atio.u.isp24.exchange_addr);
- goto out_term;
- }
-
- ql_dbg(ql_dbg_tgt_mgt, vha, 0xf022,
- "qla_target(%d): Unable to find wwn login"
- " (s_id %x:%x:%x), trying to create it manually\n",
- vha->vp_idx, s_id[0], s_id[1], s_id[2]);
-
- if (op->atio.u.raw.entry_count > 1) {
- ql_dbg(ql_dbg_tgt_mgt, vha, 0xf023,
- "Dropping multy entry atio %p\n", &op->atio);
- goto out_busy;
- }
-
- sess = qlt_make_local_sess(vha, s_id);
- /* sess has an extra creation ref. */
-
- if (!sess)
- goto out_busy;
- /*
- * Now obtain a pre-allocated session tag using the original op->atio
- * packet header, and dispatch into __qlt_do_work() using the existing
- * process context.
- */
- cmd = qlt_get_tag(vha, sess, &op->atio);
- if (!cmd) {
- struct qla_qpair *qpair = ha->base_qpair;
-
- spin_lock_irqsave(qpair->qp_lock_ptr, flags);
- qlt_send_busy(qpair, &op->atio, tc_sam_status);
- spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
-
- spin_lock_irqsave(&ha->tgt.sess_lock, flags);
- ha->tgt.tgt_ops->put_sess(sess);
- spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
- kfree(op);
- return;
- }
-
- /*
- * __qlt_do_work() will call qlt_put_sess() to release
- * the extra reference taken above by qlt_make_local_sess()
- */
- __qlt_do_work(cmd);
- kfree(op);
- return;
-out_term:
- qlt_send_term_exchange(vha->hw->base_qpair, NULL, &op->atio, 0, 0);
- kfree(op);
- return;
-out_busy:
- {
- struct qla_qpair *qpair = ha->base_qpair;
-
- spin_lock_irqsave(qpair->qp_lock_ptr, flags);
- qlt_send_busy(qpair, &op->atio, qla_sam_status);
- spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
- kfree(op);
- }
- return;
-}
-
/* ha->hardware_lock supposed to be held on entry */
static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
struct atio_from_isp *atio)
@@ -4370,23 +4284,8 @@ static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
return -EBUSY;

sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, atio->u.isp24.fcp_hdr.s_id);
- if (unlikely(!sess)) {
- struct qla_tgt_sess_op *op = kzalloc(sizeof(struct qla_tgt_sess_op),
- GFP_ATOMIC);
- if (!op)
- return -ENOMEM;
-
- memcpy(&op->atio, atio, sizeof(*atio));
- op->vha = vha;
-
- spin_lock_irqsave(&vha->cmd_list_lock, flags);
- list_add_tail(&op->cmd_list, &vha->qla_sess_op_cmd_list);
- spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
-
- INIT_WORK(&op->work, qlt_create_sess_from_atio);
- queue_work(qla_tgt_wq, &op->work);
- return 0;
- }
+ if (unlikely(!sess))
+ return -EFAULT;

/* Another WWN used to have our s_id. Our PLOGI scheduled its
* session deletion, but it's still in sess_del_work wq */
@@ -4496,14 +4395,11 @@ static int qlt_handle_task_mgmt(struct scsi_qla_host *vha, void *iocb)
{
struct atio_from_isp *a = (struct atio_from_isp *)iocb;
struct qla_hw_data *ha = vha->hw;
- struct qla_tgt *tgt;
struct fc_port *sess;
u64 unpacked_lun;
int fn;
unsigned long flags;

- tgt = vha->vha_tgt.qla_tgt;
-
fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;

spin_lock_irqsave(&ha->tgt.sess_lock, flags);
@@ -4514,15 +4410,7 @@ static int qlt_handle_task_mgmt(struct scsi_qla_host *vha, void *iocb)
unpacked_lun =
scsilun_to_int((struct scsi_lun *)&a->u.isp24.fcp_cmnd.lun);

- if (!sess) {
- ql_dbg(ql_dbg_tgt_mgt, vha, 0xf024,
- "qla_target(%d): task mgmt fn 0x%x for "
- "non-existant session\n", vha->vp_idx, fn);
- return qlt_sched_sess_work(tgt, QLA_TGT_SESS_WORK_TM, iocb,
- sizeof(struct atio_from_isp));
- }
-
- if (sess->deleted)
+ if (sess == NULL || sess->deleted)
return -EFAULT;

return qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
--
2.12.0