From: Robert Jennings Date: Mon, 12 Nov 2007 15:00:23 +0000 (-0600) Subject: [SCSI] ibmvscsi: requeue while CRQ closed X-Git-Tag: v2.6.25-rc1~1230^2~138 X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=860784c8a2b077157b6a51fb8749524d0363cc49;p=linux-2.6-omap-h63xx.git [SCSI] ibmvscsi: requeue while CRQ closed CRQ send errors that return with H_CLOSED should return with SCSI_MLQUEUE_HOST_BUSY until firmware alerts the client of a CRQ transport event. The transport event will either reinitialize and requeue the requests or fail and return IO with DID_ERROR. To avoid failing the eh_* functions while re-attaching to the server adapter this will retry for a period of time while ibmvscsi_send_srp_event returns SCSI_MLQUEUE_HOST_BUSY. In ibmvscsi_eh_abort_handler() the loop includes the search of the event list. The lock on the hostdata is dropped while waiting to try again after failing ibmvscsi_send_srp_event. The event could have been purged if a login was in progress when the function was called. In ibmvscsi_eh_device_reset_handler() the loop includes the call to get_event_struct() because a failing call to ibmvscsi_send_srp_event() will have freed the event struct. Signed-off-by: Robert Jennings Signed-off-by: Brian King Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 50120c8c164..30819012898 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -629,6 +629,16 @@ static int ibmvscsi_send_srp_event(struct srp_event_struct *evt_struct, list_del(&evt_struct->list); del_timer(&evt_struct->timer); + /* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY. + * Firmware will send a CRQ with a transport event (0xFF) to + * tell this client what has happened to the transport. This + * will be handled in ibmvscsi_handle_crq() + */ + if (rc == H_CLOSED) { + dev_warn(hostdata->dev, "send warning. " + "Receive queue closed, will retry.\n"); + goto send_busy; + } dev_err(hostdata->dev, "send error %d\n", rc); atomic_inc(&hostdata->request_limit); goto send_error; @@ -976,58 +986,74 @@ static int ibmvscsi_eh_abort_handler(struct scsi_cmnd *cmd) int rsp_rc; unsigned long flags; u16 lun = lun_from_dev(cmd->device); + unsigned long wait_switch = 0; /* First, find this command in our sent list so we can figure * out the correct tag */ spin_lock_irqsave(hostdata->host->host_lock, flags); - found_evt = NULL; - list_for_each_entry(tmp_evt, &hostdata->sent, list) { - if (tmp_evt->cmnd == cmd) { - found_evt = tmp_evt; - break; + wait_switch = jiffies + (init_timeout * HZ); + do { + found_evt = NULL; + list_for_each_entry(tmp_evt, &hostdata->sent, list) { + if (tmp_evt->cmnd == cmd) { + found_evt = tmp_evt; + break; + } } - } - if (!found_evt) { - spin_unlock_irqrestore(hostdata->host->host_lock, flags); - return SUCCESS; - } + if (!found_evt) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + return SUCCESS; + } - evt = get_event_struct(&hostdata->pool); - if (evt == NULL) { - spin_unlock_irqrestore(hostdata->host->host_lock, flags); - sdev_printk(KERN_ERR, cmd->device, "failed to allocate abort event\n"); - return FAILED; - } + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + sdev_printk(KERN_ERR, cmd->device, + "failed to allocate abort event\n"); + return FAILED; + } - init_event_struct(evt, - sync_completion, - VIOSRP_SRP_FORMAT, - init_timeout); + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + init_timeout); - tsk_mgmt = &evt->iu.srp.tsk_mgmt; + tsk_mgmt = &evt->iu.srp.tsk_mgmt; - /* Set up an abort SRP command */ - memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); - tsk_mgmt->opcode = SRP_TSK_MGMT; - tsk_mgmt->lun = ((u64) lun) << 48; - tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; - tsk_mgmt->task_tag = (u64) found_evt; - - sdev_printk(KERN_INFO, cmd->device, "aborting command. lun 0x%lx, tag 0x%lx\n", - tsk_mgmt->lun, tsk_mgmt->task_tag); - - evt->sync_srp = &srp_rsp; - init_completion(&evt->comp); - rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); + /* Set up an abort SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->opcode = SRP_TSK_MGMT; + tsk_mgmt->lun = ((u64) lun) << 48; + tsk_mgmt->tsk_mgmt_func = SRP_TSK_ABORT_TASK; + tsk_mgmt->task_tag = (u64) found_evt; + + evt->sync_srp = &srp_rsp; + + init_completion(&evt->comp); + rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); + + if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) + break; + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + msleep(10); + spin_lock_irqsave(hostdata->host->host_lock, flags); + } while (time_before(jiffies, wait_switch)); + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + if (rsp_rc != 0) { sdev_printk(KERN_ERR, cmd->device, "failed to send abort() event. rc=%d\n", rsp_rc); return FAILED; } + sdev_printk(KERN_INFO, cmd->device, + "aborting command. lun 0x%lx, tag 0x%lx\n", + (((u64) lun) << 48), (u64) found_evt); + wait_for_completion(&evt->comp); /* make sure we got a good response */ @@ -1099,41 +1125,56 @@ static int ibmvscsi_eh_device_reset_handler(struct scsi_cmnd *cmd) int rsp_rc; unsigned long flags; u16 lun = lun_from_dev(cmd->device); + unsigned long wait_switch = 0; spin_lock_irqsave(hostdata->host->host_lock, flags); - evt = get_event_struct(&hostdata->pool); - if (evt == NULL) { - spin_unlock_irqrestore(hostdata->host->host_lock, flags); - sdev_printk(KERN_ERR, cmd->device, "failed to allocate reset event\n"); - return FAILED; - } + wait_switch = jiffies + (init_timeout * HZ); + do { + evt = get_event_struct(&hostdata->pool); + if (evt == NULL) { + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + sdev_printk(KERN_ERR, cmd->device, + "failed to allocate reset event\n"); + return FAILED; + } - init_event_struct(evt, - sync_completion, - VIOSRP_SRP_FORMAT, - init_timeout); + init_event_struct(evt, + sync_completion, + VIOSRP_SRP_FORMAT, + init_timeout); - tsk_mgmt = &evt->iu.srp.tsk_mgmt; + tsk_mgmt = &evt->iu.srp.tsk_mgmt; - /* Set up a lun reset SRP command */ - memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); - tsk_mgmt->opcode = SRP_TSK_MGMT; - tsk_mgmt->lun = ((u64) lun) << 48; - tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; + /* Set up a lun reset SRP command */ + memset(tsk_mgmt, 0x00, sizeof(*tsk_mgmt)); + tsk_mgmt->opcode = SRP_TSK_MGMT; + tsk_mgmt->lun = ((u64) lun) << 48; + tsk_mgmt->tsk_mgmt_func = SRP_TSK_LUN_RESET; - sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n", - tsk_mgmt->lun); + evt->sync_srp = &srp_rsp; + + init_completion(&evt->comp); + rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); + + if (rsp_rc != SCSI_MLQUEUE_HOST_BUSY) + break; + + spin_unlock_irqrestore(hostdata->host->host_lock, flags); + msleep(10); + spin_lock_irqsave(hostdata->host->host_lock, flags); + } while (time_before(jiffies, wait_switch)); - evt->sync_srp = &srp_rsp; - init_completion(&evt->comp); - rsp_rc = ibmvscsi_send_srp_event(evt, hostdata, init_timeout * 2); spin_unlock_irqrestore(hostdata->host->host_lock, flags); + if (rsp_rc != 0) { sdev_printk(KERN_ERR, cmd->device, "failed to send reset event. rc=%d\n", rsp_rc); return FAILED; } + sdev_printk(KERN_INFO, cmd->device, "resetting device. lun 0x%lx\n", + (((u64) lun) << 48)); + wait_for_completion(&evt->comp); /* make sure we got a good response */