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scsi: zfcp: signal incomplete or error for sync exchange config/port data
Adds a new FSF-Request status flag (ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE) that signal that the data received using Exchange Config Data or Exchange Port Data was incomplete. This new flags is set in the respective handlers during the response path. With this patch, only the synchronous FSF-functions for each command got support for the new flag, otherwise it is transparent. Together with this new flag and already existing status flags the synchronous FSF-functions are extended to now detect whether the received data is complete, incomplete or completely invalid (this includes cases where a command ran into a timeout). This is now signaled back to the caller, where previously only failures on the request path would result in a bad return-code. For complete data the return-code remains 0. For incomplete data a new return-code -EAGAIN is added to the function-interface. For completely invalid data the already existing return-code -EIO is reused - formerly this was used to signal failures on the request path. Existing callers of the FSF-functions are adjusted so that they behave as before for return-code 0 and -EAGAIN, to not change the user-interface. As -EIO existed all along, it was already exposed to the user - and needed handling - and will now also be exposed in this new special case. Link: https://lore.kernel.org/r/e14f0702fa2b00a4d1f37c7981a13f2dd1ea2c83.1572018130.git.bblock@linux.ibm.com Reviewed-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
parent
7b10db5552
commit
92953c6e0a
4 changed files with 46 additions and 9 deletions
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@ -86,6 +86,7 @@
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#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
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#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
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#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
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#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000
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/************************* STRUCTURE DEFINITIONS *****************************/
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@ -585,6 +585,8 @@ static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
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&adapter->status);
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break;
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case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
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req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
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fc_host_node_name(shost) = 0;
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fc_host_port_name(shost) = 0;
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fc_host_port_id(shost) = 0;
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@ -663,6 +665,8 @@ static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
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zfcp_fsf_exchange_port_evaluate(req);
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break;
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case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
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req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
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zfcp_fsf_exchange_port_evaluate(req);
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zfcp_fsf_link_down_info_eval(req,
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&qtcb->header.fsf_status_qual.link_down_info);
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@ -1278,6 +1282,19 @@ int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
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return retval;
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}
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/**
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* zfcp_fsf_exchange_config_data_sync() - Request information about FCP channel.
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* @qdio: pointer to the QDIO-Queue to use for sending the command.
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* @data: pointer to the QTCB-Bottom for storing the result of the command,
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* might be %NULL.
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*
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* Returns:
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* * 0 - Exchange Config Data was successful, @data is complete
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* * -EIO - Exchange Config Data was not successful, @data is invalid
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* * -EAGAIN - @data contains incomplete data
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* * -ENOMEM - Some memory allocation failed along the way
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*/
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int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
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struct fsf_qtcb_bottom_config *data)
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{
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@ -1309,9 +1326,16 @@ int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
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zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
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retval = zfcp_fsf_req_send(req);
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spin_unlock_irq(&qdio->req_q_lock);
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if (!retval) {
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/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
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wait_for_completion(&req->completion);
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if (req->status &
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(ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
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retval = -EIO;
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else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
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retval = -EAGAIN;
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}
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zfcp_fsf_req_free(req);
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@ -1369,10 +1393,17 @@ int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
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}
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/**
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* zfcp_fsf_exchange_port_data_sync - request information about local port
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* @qdio: pointer to struct zfcp_qdio
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* @data: pointer to struct fsf_qtcb_bottom_port
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* Returns: 0 on success, error otherwise
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* zfcp_fsf_exchange_port_data_sync() - Request information about local port.
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* @qdio: pointer to the QDIO-Queue to use for sending the command.
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* @data: pointer to the QTCB-Bottom for storing the result of the command,
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* might be %NULL.
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*
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* Returns:
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* * 0 - Exchange Port Data was successful, @data is complete
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* * -EIO - Exchange Port Data was not successful, @data is invalid
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* * -EAGAIN - @data contains incomplete data
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* * -ENOMEM - Some memory allocation failed along the way
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* * -EOPNOTSUPP - This operation is not supported
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*/
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int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
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struct fsf_qtcb_bottom_port *data)
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@ -1408,10 +1439,15 @@ int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
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if (!retval) {
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/* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
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wait_for_completion(&req->completion);
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if (req->status &
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(ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
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retval = -EIO;
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else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
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retval = -EAGAIN;
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}
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zfcp_fsf_req_free(req);
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return retval;
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out_unlock:
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@ -605,7 +605,7 @@ zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
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return NULL;
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ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
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if (ret) {
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if (ret != 0 && ret != -EAGAIN) {
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kfree(data);
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return NULL;
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}
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@ -634,7 +634,7 @@ static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
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return;
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ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
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if (ret)
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if (ret != 0 && ret != -EAGAIN)
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kfree(data);
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else {
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adapter->stats_reset = jiffies/HZ;
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@ -577,7 +577,7 @@ static ssize_t zfcp_sysfs_adapter_util_show(struct device *dev,
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return -ENOMEM;
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retval = zfcp_fsf_exchange_port_data_sync(adapter->qdio, qtcb_port);
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if (!retval)
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if (retval == 0 || retval == -EAGAIN)
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retval = sprintf(buf, "%u %u %u\n", qtcb_port->cp_util,
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qtcb_port->cb_util, qtcb_port->a_util);
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kfree(qtcb_port);
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@ -603,7 +603,7 @@ static int zfcp_sysfs_adapter_ex_config(struct device *dev,
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return -ENOMEM;
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retval = zfcp_fsf_exchange_config_data_sync(adapter->qdio, qtcb_config);
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if (!retval)
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if (retval == 0 || retval == -EAGAIN)
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*stat_inf = qtcb_config->stat_info;
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kfree(qtcb_config);
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