[SCSI] ibmvfc: Add flush on halt support
The virtual I/O server controlling the NPIV adapter associated with a virtual fibre channel adapter can send a HALT event to the client. When this occurs, the client can no longer send commands until a RESUME is received. By adding support for flush on halt, we will get all of our outstanding commands flushed back before the Virtual I/O server enters the halt state, eliminating potential command timeouts for outstanding commands which might occur if we did not support this feature. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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@ -110,7 +110,7 @@ static const struct {
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" },
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
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{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
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{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
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@ -1169,8 +1169,9 @@ static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
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login_info->partition_num = vhost->partition_number;
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login_info->vfc_frame_version = 1;
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login_info->fcp_version = 3;
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login_info->flags = IBMVFC_FLUSH_ON_HALT;
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if (vhost->client_migrated)
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login_info->flags = IBMVFC_CLIENT_MIGRATED;
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login_info->flags |= IBMVFC_CLIENT_MIGRATED;
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login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
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login_info->capabilities = IBMVFC_CAN_MIGRATE;
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@ -2185,8 +2186,25 @@ static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
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" node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
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switch (crq->event) {
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case IBMVFC_AE_LINK_UP:
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case IBMVFC_AE_RESUME:
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switch (crq->link_state) {
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case IBMVFC_AE_LS_LINK_DOWN:
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ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
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break;
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case IBMVFC_AE_LS_LINK_DEAD:
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ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
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break;
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case IBMVFC_AE_LS_LINK_UP:
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case IBMVFC_AE_LS_LINK_BOUNCED:
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default:
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vhost->events_to_log |= IBMVFC_AE_LINKUP;
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vhost->delay_init = 1;
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__ibmvfc_reset_host(vhost);
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break;
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};
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break;
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case IBMVFC_AE_LINK_UP:
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vhost->events_to_log |= IBMVFC_AE_LINKUP;
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vhost->delay_init = 1;
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__ibmvfc_reset_host(vhost);
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@ -2505,6 +2523,14 @@ static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
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return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
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}
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static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct Scsi_Host *shost = class_to_shost(dev);
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struct ibmvfc_host *vhost = shost_priv(shost);
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return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
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}
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/**
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* ibmvfc_show_log_level - Show the adapter's error logging level
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* @dev: class device struct
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@ -2554,6 +2580,7 @@ static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
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static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
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static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
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static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
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static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
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static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
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ibmvfc_show_log_level, ibmvfc_store_log_level);
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@ -2609,6 +2636,7 @@ static struct device_attribute *ibmvfc_attrs[] = {
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&dev_attr_port_loc_code,
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&dev_attr_drc_name,
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&dev_attr_npiv_version,
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&dev_attr_capabilities,
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&dev_attr_log_level,
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NULL
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};
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@ -207,7 +207,8 @@ struct ibmvfc_npiv_login_resp {
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#define IBMVFC_NATIVE_FC 0x01
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#define IBMVFC_CAN_FLUSH_ON_HALT 0x08
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u32 reserved;
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u64 capabilites;
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u64 capabilities;
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#define IBMVFC_CAN_FLUSH_ON_HALT 0x08
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u32 max_cmds;
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u32 scsi_id_sz;
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u64 max_dma_len;
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@ -547,9 +548,17 @@ struct ibmvfc_crq_queue {
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dma_addr_t msg_token;
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};
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enum ibmvfc_ae_link_state {
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IBMVFC_AE_LS_LINK_UP = 0x01,
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IBMVFC_AE_LS_LINK_BOUNCED = 0x02,
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IBMVFC_AE_LS_LINK_DOWN = 0x04,
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IBMVFC_AE_LS_LINK_DEAD = 0x08,
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};
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struct ibmvfc_async_crq {
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volatile u8 valid;
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u8 pad[3];
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u8 link_state;
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u8 pad[2];
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u32 pad2;
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volatile u64 event;
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volatile u64 scsi_id;
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