[SCSI] lpfc 8.3.27: Fix queue allocation failure recovery

Fix queue allocation failure recovery

- Move the allocation of the Queues closer to the creation of the queues.
- If there is a problem with creation, or if the HBA is reset, the queues
  will be completely freed and re allocated.
- Only allocate fcp_eq_hdl if cfg_fcp_eq_count is non-zero.

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 93 insertions, 60 deletions

diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 99bc2bb1987f..907c94b9245d 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -58,8 +58,7 @@ spinlock_t _dump_buf_lock;
 
 static void lpfc_get_hba_model_desc(struct lpfc_hba *, uint8_t *, uint8_t *);
 static int lpfc_post_rcv_buf(struct lpfc_hba *);
-static int lpfc_sli4_queue_create(struct lpfc_hba *);
-static void lpfc_sli4_queue_destroy(struct lpfc_hba *);
+static int lpfc_sli4_queue_verify(struct lpfc_hba *);
 static int lpfc_create_bootstrap_mbox(struct lpfc_hba *);
 static int lpfc_setup_endian_order(struct lpfc_hba *);
 static int lpfc_sli4_read_config(struct lpfc_hba *);
@@ -4493,15 +4492,15 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
                 }
         }
         mempool_free(mboxq, phba->mbox_mem_pool);
-        /* Create all the SLI4 queues */
-        rc = lpfc_sli4_queue_create(phba);
+        /* Verify all the SLI4 queues */
+        rc = lpfc_sli4_queue_verify(phba);
         if (rc)
                 goto out_free_bsmbx;
 
         /* Create driver internal CQE event pool */
         rc = lpfc_sli4_cq_event_pool_create(phba);
         if (rc)
-                goto out_destroy_queue;
+                goto out_free_bsmbx;
 
         /* Initialize and populate the iocb list per host */
         rc = lpfc_init_sgl_list(phba);
@@ -4535,14 +4534,21 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
                 goto out_remove_rpi_hdrs;
         }
 
-        phba->sli4_hba.fcp_eq_hdl = kzalloc((sizeof(struct lpfc_fcp_eq_hdl) *
+        /*
+         * The cfg_fcp_eq_count can be zero whenever there is exactly one
+         * interrupt vector.  This is not an error
+         */
+        if (phba->cfg_fcp_eq_count) {
+                phba->sli4_hba.fcp_eq_hdl =
+                                kzalloc((sizeof(struct lpfc_fcp_eq_hdl) *
                                     phba->cfg_fcp_eq_count), GFP_KERNEL);
-        if (!phba->sli4_hba.fcp_eq_hdl) {
-                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                                "2572 Failed allocate memory for fast-path "
-                                "per-EQ handle array\n");
-                rc = -ENOMEM;
-                goto out_free_fcf_rr_bmask;
+                if (!phba->sli4_hba.fcp_eq_hdl) {
+                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                        "2572 Failed allocate memory for "
+                                        "fast-path per-EQ handle array\n");
+                        rc = -ENOMEM;
+                        goto out_free_fcf_rr_bmask;
+                }
         }
 
         phba->sli4_hba.msix_entries = kzalloc((sizeof(struct msix_entry) *
@@ -4586,8 +4592,6 @@ out_free_sgl_list:
         lpfc_free_sgl_list(phba);
 out_destroy_cq_event_pool:
         lpfc_sli4_cq_event_pool_destroy(phba);
-out_destroy_queue:
-        lpfc_sli4_queue_destroy(phba);
 out_free_bsmbx:
         lpfc_destroy_bootstrap_mbox(phba);
 out_free_mem:
@@ -4627,9 +4631,6 @@ lpfc_sli4_driver_resource_unset(struct lpfc_hba *phba)
         /* Free the SCSI sgl management array */
         kfree(phba->sli4_hba.lpfc_scsi_psb_array);
 
-        /* Free the SLI4 queues */
-        lpfc_sli4_queue_destroy(phba);
-
         /* Free the completion queue EQ event pool */
         lpfc_sli4_cq_event_release_all(phba);
         lpfc_sli4_cq_event_pool_destroy(phba);
@@ -6158,24 +6159,21 @@ lpfc_setup_endian_order(struct lpfc_hba *phba)
 }
 
 /**
- * lpfc_sli4_queue_create - Create all the SLI4 queues
+ * lpfc_sli4_queue_verify - Verify and update EQ and CQ counts
  * @phba: pointer to lpfc hba data structure.
  *
- * This routine is invoked to allocate all the SLI4 queues for the FCoE HBA
- * operation. For each SLI4 queue type, the parameters such as queue entry
- * count (queue depth) shall be taken from the module parameter. For now,
- * we just use some constant number as place holder.
+ * This routine is invoked to check the user settable queue counts for EQs and
+ * CQs. after this routine is called the counts will be set to valid values that
+ * adhere to the constraints of the system's interrupt vectors and the port's
+ * queue resources.
  *
  * Return codes
  *      0 - successful
  *      -ENOMEM - No available memory
- *      -EIO - The mailbox failed to complete successfully.
  **/
 static int
-lpfc_sli4_queue_create(struct lpfc_hba *phba)
+lpfc_sli4_queue_verify(struct lpfc_hba *phba)
 {
-        struct lpfc_queue *qdesc;
-        int fcp_eqidx, fcp_cqidx, fcp_wqidx;
         int cfg_fcp_wq_count;
         int cfg_fcp_eq_count;
 
@@ -6248,14 +6246,43 @@ lpfc_sli4_queue_create(struct lpfc_hba *phba)
         /* The overall number of event queues used */
         phba->sli4_hba.cfg_eqn = phba->cfg_fcp_eq_count + LPFC_SP_EQN_DEF;
 
-        /*
-         * Create Event Queues (EQs)
-         */
-
         /* Get EQ depth from module parameter, fake the default for now */
         phba->sli4_hba.eq_esize = LPFC_EQE_SIZE_4B;
         phba->sli4_hba.eq_ecount = LPFC_EQE_DEF_COUNT;
 
+        /* Get CQ depth from module parameter, fake the default for now */
+        phba->sli4_hba.cq_esize = LPFC_CQE_SIZE;
+        phba->sli4_hba.cq_ecount = LPFC_CQE_DEF_COUNT;
+
+        return 0;
+out_error:
+        return -ENOMEM;
+}
+
+/**
+ * lpfc_sli4_queue_create - Create all the SLI4 queues
+ * @phba: pointer to lpfc hba data structure.
+ *
+ * This routine is invoked to allocate all the SLI4 queues for the FCoE HBA
+ * operation. For each SLI4 queue type, the parameters such as queue entry
+ * count (queue depth) shall be taken from the module parameter. For now,
+ * we just use some constant number as place holder.
+ *
+ * Return codes
+ *      0 - sucessful
+ *      -ENOMEM - No availble memory
+ *      -EIO - The mailbox failed to complete successfully.
+ **/
+int
+lpfc_sli4_queue_create(struct lpfc_hba *phba)
+{
+        struct lpfc_queue *qdesc;
+        int fcp_eqidx, fcp_cqidx, fcp_wqidx;
+
+        /*
+         * Create Event Queues (EQs)
+         */
+
         /* Create slow path event queue */
         qdesc = lpfc_sli4_queue_alloc(phba, phba->sli4_hba.eq_esize,
                                       phba->sli4_hba.eq_ecount);
@@ -6266,14 +6293,20 @@ lpfc_sli4_queue_create(struct lpfc_hba *phba)
         }
         phba->sli4_hba.sp_eq = qdesc;
 
-        /* Create fast-path FCP Event Queue(s) */
-        phba->sli4_hba.fp_eq = kzalloc((sizeof(struct lpfc_queue *) *
-                               phba->cfg_fcp_eq_count), GFP_KERNEL);
-        if (!phba->sli4_hba.fp_eq) {
-                lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
-                                "2576 Failed allocate memory for fast-path "
-                                "EQ record array\n");
-                goto out_free_sp_eq;
+        /*
+         * Create fast-path FCP Event Queue(s).  The cfg_fcp_eq_count can be
+         * zero whenever there is exactly one interrupt vector.  This is not
+         * an error.
+         */
+        if (phba->cfg_fcp_eq_count) {
+                phba->sli4_hba.fp_eq = kzalloc((sizeof(struct lpfc_queue *) *
+                                       phba->cfg_fcp_eq_count), GFP_KERNEL);
+                if (!phba->sli4_hba.fp_eq) {
+                        lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
+                                        "2576 Failed allocate memory for "
+                                        "fast-path EQ record array\n");
+                        goto out_free_sp_eq;
+                }
         }
         for (fcp_eqidx = 0; fcp_eqidx < phba->cfg_fcp_eq_count; fcp_eqidx++) {
                 qdesc = lpfc_sli4_queue_alloc(phba, phba->sli4_hba.eq_esize,
@@ -6290,10 +6323,6 @@ lpfc_sli4_queue_create(struct lpfc_hba *phba)
          * Create Complete Queues (CQs)
          */
 
-        /* Get CQ depth from module parameter, fake the default for now */
-        phba->sli4_hba.cq_esize = LPFC_CQE_SIZE;
-        phba->sli4_hba.cq_ecount = LPFC_CQE_DEF_COUNT;
-
         /* Create slow-path Mailbox Command Complete Queue */
         qdesc = lpfc_sli4_queue_alloc(phba, phba->sli4_hba.cq_esize,
                                       phba->sli4_hba.cq_ecount);
@@ -6315,16 +6344,25 @@ lpfc_sli4_queue_create(struct lpfc_hba *phba)
         phba->sli4_hba.els_cq = qdesc;
 
 
-        /* Create fast-path FCP Completion Queue(s), one-to-one with EQs */
-        phba->sli4_hba.fcp_cq = kzalloc((sizeof(struct lpfc_queue *) *
-                                phba->cfg_fcp_eq_count), GFP_KERNEL);
+        /*
+         * Create fast-path FCP Completion Queue(s), one-to-one with FCP EQs.
+         * If there are no FCP EQs then create exactly one FCP CQ.
+         */
+        if (phba->cfg_fcp_eq_count)
+                phba->sli4_hba.fcp_cq = kzalloc((sizeof(struct lpfc_queue *) *
+                                                 phba->cfg_fcp_eq_count),
+                                                GFP_KERNEL);
+        else
+                phba->sli4_hba.fcp_cq = kzalloc(sizeof(struct lpfc_queue *),
+                                                GFP_KERNEL);
         if (!phba->sli4_hba.fcp_cq) {
                 lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
                                 "2577 Failed allocate memory for fast-path "
                                 "CQ record array\n");
                 goto out_free_els_cq;
         }
-        for (fcp_cqidx = 0; fcp_cqidx < phba->cfg_fcp_eq_count; fcp_cqidx++) {
+        fcp_cqidx = 0;
+        do {
                 qdesc = lpfc_sli4_queue_alloc(phba, phba->sli4_hba.cq_esize,
                                               phba->sli4_hba.cq_ecount);
                 if (!qdesc) {
@@ -6334,7 +6372,7 @@ lpfc_sli4_queue_create(struct lpfc_hba *phba)
                         goto out_free_fcp_cq;
                 }
                 phba->sli4_hba.fcp_cq[fcp_cqidx] = qdesc;
-        }
+        } while (++fcp_cqidx < phba->cfg_fcp_eq_count);
 
         /* Create Mailbox Command Queue */
         phba->sli4_hba.mq_esize = LPFC_MQE_SIZE;
@@ -6466,7 +6504,7 @@ out_error:
  *      -ENOMEM - No available memory
  *      -EIO - The mailbox failed to complete successfully.
  **/
-static void
+void
 lpfc_sli4_queue_destroy(struct lpfc_hba *phba)
 {
         int fcp_qidx;
@@ -6814,8 +6852,10 @@ lpfc_sli4_queue_unset(struct lpfc_hba *phba)
         /* Unset ELS complete queue */
         lpfc_cq_destroy(phba, phba->sli4_hba.els_cq);
         /* Unset FCP response complete queue */
-        for (fcp_qidx = 0; fcp_qidx < phba->cfg_fcp_eq_count; fcp_qidx++)
+        fcp_qidx = 0;
+        do {
                 lpfc_cq_destroy(phba, phba->sli4_hba.fcp_cq[fcp_qidx]);
+        } while (++fcp_qidx < phba->cfg_fcp_eq_count);
         /* Unset fast-path event queue */
         for (fcp_qidx = 0; fcp_qidx < phba->cfg_fcp_eq_count; fcp_qidx++)
                 lpfc_eq_destroy(phba, phba->sli4_hba.fp_eq[fcp_qidx]);
@@ -7995,6 +8035,7 @@ lpfc_sli4_unset_hba(struct lpfc_hba *phba)
 
         /* Reset SLI4 HBA FCoE function */
         lpfc_pci_function_reset(phba);
+        lpfc_sli4_queue_destroy(phba);
 
         return;
 }
@@ -8108,6 +8149,7 @@ lpfc_sli4_hba_unset(struct lpfc_hba *phba)
 
         /* Reset SLI4 HBA FCoE function */
         lpfc_pci_function_reset(phba);
+        lpfc_sli4_queue_destroy(phba);
 
         /* Stop the SLI4 device port */
         phba->pport->work_port_events = 0;
@@ -9008,7 +9050,6 @@ lpfc_pci_probe_one_s4(struct pci_dev *pdev, const struct pci_device_id *pid)
         uint32_t cfg_mode, intr_mode;
         int mcnt;
         int adjusted_fcp_eq_count;
-        int fcp_qidx;
         const struct firmware *fw;
         uint8_t file_name[16];
 
@@ -9117,16 +9158,6 @@ lpfc_pci_probe_one_s4(struct pci_dev *pdev, const struct pci_device_id *pid)
                         adjusted_fcp_eq_count = phba->sli4_hba.msix_vec_nr - 1;
                 else
                         adjusted_fcp_eq_count = phba->cfg_fcp_eq_count;
-                /* Free unused EQs */
-                for (fcp_qidx = adjusted_fcp_eq_count;
-                     fcp_qidx < phba->cfg_fcp_eq_count;
-                     fcp_qidx++) {
-                        lpfc_sli4_queue_free(phba->sli4_hba.fp_eq[fcp_qidx]);
-                        /* do not delete the first fcp_cq */
-                        if (fcp_qidx)
-                                lpfc_sli4_queue_free(
-                                        phba->sli4_hba.fcp_cq[fcp_qidx]);
-                }
                 phba->cfg_fcp_eq_count = adjusted_fcp_eq_count;
                 /* Set up SLI-4 HBA */
                 if (lpfc_sli4_hba_setup(phba)) {
@@ -9309,6 +9340,7 @@ lpfc_pci_suspend_one_s4(struct pci_dev *pdev, pm_message_t msg)
 
         /* Disable interrupt from device */
         lpfc_sli4_disable_intr(phba);
+        lpfc_sli4_queue_destroy(phba);
 
         /* Save device state to PCI config space */
         pci_save_state(pdev);
@@ -9438,6 +9470,7 @@ lpfc_sli4_prep_dev_for_reset(struct lpfc_hba *phba)
 
         /* Disable interrupt and pci device */
         lpfc_sli4_disable_intr(phba);
+        lpfc_sli4_queue_destroy(phba);
         pci_disable_device(phba->pcidev);
 
         /* Flush all driver's outstanding SCSI I/Os as we are to reset */