+ fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
+ old->seconds_since_last_reset;
+ fc_stats->tx_frames = data->tx_frames - old->tx_frames;
+ fc_stats->tx_words = data->tx_words - old->tx_words;
+ fc_stats->rx_frames = data->rx_frames - old->rx_frames;
+ fc_stats->rx_words = data->rx_words - old->rx_words;
+ fc_stats->lip_count = data->lip - old->lip;
+ fc_stats->nos_count = data->nos - old->nos;
+ fc_stats->error_frames = data->error_frames - old->error_frames;
+ fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
+ fc_stats->link_failure_count = data->link_failure - old->link_failure;
+ fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
+ fc_stats->loss_of_signal_count = data->loss_of_signal -
+ old->loss_of_signal;
+ fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
+ old->psp_error_counts;
+ fc_stats->invalid_tx_word_count = data->invalid_tx_words -
+ old->invalid_tx_words;
+ fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
+ fc_stats->fcp_input_requests = data->input_requests -
+ old->input_requests;
+ fc_stats->fcp_output_requests = data->output_requests -
+ old->output_requests;
+ fc_stats->fcp_control_requests = data->control_requests -
+ old->control_requests;
+ fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
+ fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
+}
+
+static void
+zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
+ struct fsf_qtcb_bottom_port *data)
+{
+ fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
+ fc_stats->tx_frames = data->tx_frames;
+ fc_stats->tx_words = data->tx_words;
+ fc_stats->rx_frames = data->rx_frames;
+ fc_stats->rx_words = data->rx_words;
+ fc_stats->lip_count = data->lip;
+ fc_stats->nos_count = data->nos;
+ fc_stats->error_frames = data->error_frames;
+ fc_stats->dumped_frames = data->dumped_frames;
+ fc_stats->link_failure_count = data->link_failure;
+ fc_stats->loss_of_sync_count = data->loss_of_sync;
+ fc_stats->loss_of_signal_count = data->loss_of_signal;
+ fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
+ fc_stats->invalid_tx_word_count = data->invalid_tx_words;
+ fc_stats->invalid_crc_count = data->invalid_crcs;
+ fc_stats->fcp_input_requests = data->input_requests;
+ fc_stats->fcp_output_requests = data->output_requests;
+ fc_stats->fcp_control_requests = data->control_requests;
+ fc_stats->fcp_input_megabytes = data->input_mb;
+ fc_stats->fcp_output_megabytes = data->output_mb;
+}
+
+/**
+ * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
+ *
+ * assumption: scsi_transport_fc synchronizes calls of
+ * get_fc_host_stats and reset_fc_host_stats
+ * (XXX to be checked otherwise introduce locking)
+ */
+static struct fc_host_statistics *
+zfcp_get_fc_host_stats(struct Scsi_Host *shost)
+{
+ struct zfcp_adapter *adapter;
+ struct fc_host_statistics *fc_stats;
+ struct fsf_qtcb_bottom_port *data;
+ int ret;
+
+ adapter = (struct zfcp_adapter *)shost->hostdata[0];
+ fc_stats = zfcp_init_fc_host_stats(adapter);
+ if (!fc_stats)
+ return NULL;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return NULL;
+
+ ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
+ if (ret) {
+ kfree(data);
+ return NULL; /* XXX return zeroed fc_stats? */
+ }
+
+ if (adapter->stats_reset &&
+ ((jiffies/HZ - adapter->stats_reset) <
+ data->seconds_since_last_reset)) {
+ zfcp_adjust_fc_host_stats(fc_stats, data,
+ adapter->stats_reset_data);
+ } else
+ zfcp_set_fc_host_stats(fc_stats, data);