[SCSI] ibmvfc: Add support for NPIV Logout

This patch adds support for a new command supported by the Virtual I/O
Server, NPIV Logout. The command will abort all outstanding commands
and log out of the fabric. Currently, the only way to do this is
by breaking the CRQ, which can take a fairly long time when lots of
commands are outstanding. The NPIV Logout commands provides a mechanism
to accomplish virtually the same function, but is much faster.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 76ae266..6eb3b75 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -143,6 +143,7 @@ static void ibmvfc_npiv_login(struct ibmvfc_host *);
 static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
+static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 
 static const char *unknown_error = "unknown error";
 
@@ -477,6 +478,10 @@ static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
                if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
                        vhost->action = action;
                break;
+       case IBMVFC_HOST_ACTION_LOGO_WAIT:
+               if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
+                       vhost->action = action;
+               break;
        case IBMVFC_HOST_ACTION_INIT_WAIT:
                if (vhost->action == IBMVFC_HOST_ACTION_INIT)
                        vhost->action = action;
@@ -496,6 +501,7 @@ static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
                if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
                        vhost->action = action;
                break;
+       case IBMVFC_HOST_ACTION_LOGO:
        case IBMVFC_HOST_ACTION_INIT:
        case IBMVFC_HOST_ACTION_TGT_DEL:
        case IBMVFC_HOST_ACTION_QUERY_TGTS:
@@ -647,6 +653,7 @@ static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
        vhost->state = IBMVFC_NO_CRQ;
+       vhost->logged_in = 0;
        dma_unmap_single(vhost->dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
        free_page((unsigned long)crq->msgs);
 }
@@ -693,6 +700,7 @@ static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
        } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 
        vhost->state = IBMVFC_NO_CRQ;
+       vhost->logged_in = 0;
        ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
 
        /* Clean out the queue */
@@ -808,10 +816,10 @@ static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
 }
 
 /**
- * __ibmvfc_reset_host - Reset the connection to the server (no locking)
+ * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
  * @vhost:     struct ibmvfc host to reset
  **/
-static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
+static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
 {
        int rc;
 
@@ -827,9 +835,25 @@ static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
 }
 
 /**
- * ibmvfc_reset_host - Reset the connection to the server
+ * __ibmvfc_reset_host - Reset the connection to the server (no locking)
  * @vhost:     struct ibmvfc host to reset
  **/
+static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
+{
+       if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
+           !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
+               scsi_block_requests(vhost->host);
+               ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
+               vhost->job_step = ibmvfc_npiv_logout;
+               wake_up(&vhost->work_wait_q);
+       } else
+               ibmvfc_hard_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_reset_host - Reset the connection to the server
+ * @vhost:     ibmvfc host struct
+ **/
 static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
 {
        unsigned long flags;
@@ -2230,6 +2254,7 @@ static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost)
                return;
        case IBMVFC_CRQ_XPORT_EVENT:
                vhost->state = IBMVFC_NO_CRQ;
+               vhost->logged_in = 0;
                ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
                if (crq->format == IBMVFC_PARTITION_MIGRATED) {
                        /* We need to re-setup the interpartition connection */
@@ -3554,6 +3579,7 @@ static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
                return;
        }
 
+       vhost->logged_in = 1;
        npiv_max_sectors = min((uint)(rsp->max_dma_len >> 9), IBMVFC_MAX_SECTORS);
        dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
                 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
@@ -3611,6 +3637,65 @@ static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
                ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
 };
 
+/**
+ * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
+ * @vhost:             ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
+{
+       struct ibmvfc_host *vhost = evt->vhost;
+       u32 mad_status = evt->xfer_iu->npiv_logout.common.status;
+
+       ibmvfc_free_event(evt);
+
+       switch (mad_status) {
+       case IBMVFC_MAD_SUCCESS:
+               if (list_empty(&vhost->sent) &&
+                   vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
+                       ibmvfc_init_host(vhost, 0);
+                       return;
+               }
+               break;
+       case IBMVFC_MAD_FAILED:
+       case IBMVFC_MAD_NOT_SUPPORTED:
+       case IBMVFC_MAD_CRQ_ERROR:
+       case IBMVFC_MAD_DRIVER_FAILED:
+       default:
+               ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
+               break;
+       }
+
+       ibmvfc_hard_reset_host(vhost);
+}
+
+/**
+ * ibmvfc_npiv_logout - Issue an NPIV Logout
+ * @vhost:             ibmvfc host struct
+ *
+ **/
+static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
+{
+       struct ibmvfc_npiv_logout_mad *mad;
+       struct ibmvfc_event *evt;
+
+       evt = ibmvfc_get_event(vhost);
+       ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
+
+       mad = &evt->iu.npiv_logout;
+       memset(mad, 0, sizeof(*mad));
+       mad->common.version = 1;
+       mad->common.opcode = IBMVFC_NPIV_LOGOUT;
+       mad->common.length = sizeof(struct ibmvfc_npiv_logout_mad);
+
+       ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
+
+       if (!ibmvfc_send_event(evt, vhost, default_timeout))
+               ibmvfc_dbg(vhost, "Sent NPIV logout\n");
+       else
+               ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+}
+
 /**
  * ibmvfc_dev_init_to_do - Is there target initialization work to do?
  * @vhost:             ibmvfc host struct
@@ -3647,6 +3732,7 @@ static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
        switch (vhost->action) {
        case IBMVFC_HOST_ACTION_NONE:
        case IBMVFC_HOST_ACTION_INIT_WAIT:
+       case IBMVFC_HOST_ACTION_LOGO_WAIT:
                return 0;
        case IBMVFC_HOST_ACTION_TGT_INIT:
        case IBMVFC_HOST_ACTION_QUERY_TGTS:
@@ -3659,6 +3745,7 @@ static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
                        if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
                                return 0;
                return 1;
+       case IBMVFC_HOST_ACTION_LOGO:
        case IBMVFC_HOST_ACTION_INIT:
        case IBMVFC_HOST_ACTION_ALLOC_TGTS:
        case IBMVFC_HOST_ACTION_TGT_DEL:
@@ -3765,8 +3852,12 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
        vhost->events_to_log = 0;
        switch (vhost->action) {
        case IBMVFC_HOST_ACTION_NONE:
+       case IBMVFC_HOST_ACTION_LOGO_WAIT:
        case IBMVFC_HOST_ACTION_INIT_WAIT:
                break;
+       case IBMVFC_HOST_ACTION_LOGO:
+               vhost->job_step(vhost);
+               break;
        case IBMVFC_HOST_ACTION_INIT:
                BUG_ON(vhost->state != IBMVFC_INITIALIZING);
                if (vhost->delay_init) {

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.h b/drivers/scsi/ibmvscsi/ibmvfc.h
index 3a6a725..6adaad8 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvfc.h
+++ b/drivers/scsi/ibmvscsi/ibmvfc.h
@@ -57,9 +57,10 @@
  * Ensure we have resources for ERP and initialization:
  * 1 for ERP
  * 1 for initialization
+ * 1 for NPIV Logout
  * 2 for each discovery thread
  */
-#define IBMVFC_NUM_INTERNAL_REQ        (1 + 1 + (disc_threads * 2))
+#define IBMVFC_NUM_INTERNAL_REQ        (1 + 1 + 1 + (disc_threads * 2))
 
 #define IBMVFC_MAD_SUCCESS             0x00
 #define IBMVFC_MAD_NOT_SUPPORTED       0xF1
@@ -127,6 +128,7 @@ enum ibmvfc_mad_types {
        IBMVFC_IMPLICIT_LOGOUT  = 0x0040,
        IBMVFC_PASSTHRU         = 0x0200,
        IBMVFC_TMF_MAD          = 0x0100,
+       IBMVFC_NPIV_LOGOUT      = 0x0800,
 };
 
 struct ibmvfc_mad_common {
@@ -143,6 +145,10 @@ struct ibmvfc_npiv_login_mad {
        struct srp_direct_buf buffer;
 }__attribute__((packed, aligned (8)));
 
+struct ibmvfc_npiv_logout_mad {
+       struct ibmvfc_mad_common common;
+}__attribute__((packed, aligned (8)));
+
 #define IBMVFC_MAX_NAME 256
 
 struct ibmvfc_npiv_login {
@@ -561,6 +567,7 @@ struct ibmvfc_async_crq_queue {
 union ibmvfc_iu {
        struct ibmvfc_mad_common mad_common;
        struct ibmvfc_npiv_login_mad npiv_login;
+       struct ibmvfc_npiv_logout_mad npiv_logout;
        struct ibmvfc_discover_targets discover_targets;
        struct ibmvfc_port_login plogi;
        struct ibmvfc_process_login prli;
@@ -627,6 +634,8 @@ struct ibmvfc_event_pool {
 
 enum ibmvfc_host_action {
        IBMVFC_HOST_ACTION_NONE = 0,
+       IBMVFC_HOST_ACTION_LOGO,
+       IBMVFC_HOST_ACTION_LOGO_WAIT,
        IBMVFC_HOST_ACTION_INIT,
        IBMVFC_HOST_ACTION_INIT_WAIT,
        IBMVFC_HOST_ACTION_QUERY,
@@ -682,6 +691,7 @@ struct ibmvfc_host {
        int reinit;
        int delay_init;
        int scan_complete;
+       int logged_in;
        int events_to_log;
 #define IBMVFC_AE_LINKUP       0x0001
 #define IBMVFC_AE_LINKDOWN     0x0002