[SCSI] lpfc 8.1.7 : Add statistics reset callback for FC transport

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 103 insertions, 4 deletions

diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 5c68cdd8736f..762d623018f3 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -1210,8 +1210,10 @@ lpfc_get_stats(struct Scsi_Host *shost)
         struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
         struct lpfc_sli *psli = &phba->sli;
         struct fc_host_statistics *hs = &phba->link_stats;
+        struct lpfc_lnk_stat * lso = &psli->lnk_stat_offsets;
         LPFC_MBOXQ_t *pmboxq;
         MAILBOX_t *pmb;
+        unsigned long seconds;
         int rc = 0;
 
         pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
@@ -1272,22 +1274,103 @@ lpfc_get_stats(struct Scsi_Host *shost)
         hs->invalid_crc_count = pmb->un.varRdLnk.crcCnt;
         hs->error_frames = pmb->un.varRdLnk.crcCnt;
 
+        hs->link_failure_count -= lso->link_failure_count;
+        hs->loss_of_sync_count -= lso->loss_of_sync_count;
+        hs->loss_of_signal_count -= lso->loss_of_signal_count;
+        hs->prim_seq_protocol_err_count -= lso->prim_seq_protocol_err_count;
+        hs->invalid_tx_word_count -= lso->invalid_tx_word_count;
+        hs->invalid_crc_count -= lso->invalid_crc_count;
+        hs->error_frames -= lso->error_frames;
+
         if (phba->fc_topology == TOPOLOGY_LOOP) {
                 hs->lip_count = (phba->fc_eventTag >> 1);
+                hs->lip_count -= lso->link_events;
                 hs->nos_count = -1;
         } else {
                 hs->lip_count = -1;
                 hs->nos_count = (phba->fc_eventTag >> 1);
+                hs->nos_count -= lso->link_events;
         }
 
         hs->dumped_frames = -1;
 
-/* FIX ME */
-        /*hs->SecondsSinceLastReset = (jiffies - lpfc_loadtime) / HZ;*/
+        seconds = get_seconds();
+        if (seconds < psli->stats_start)
+                hs->seconds_since_last_reset = seconds +
+                                ((unsigned long)-1 - psli->stats_start);
+        else
+                hs->seconds_since_last_reset = seconds - psli->stats_start;
 
         return hs;
 }
 
+static void
+lpfc_reset_stats(struct Scsi_Host *shost)
+{
+        struct lpfc_hba *phba = (struct lpfc_hba *)shost->hostdata;
+        struct lpfc_sli *psli = &phba->sli;
+        struct lpfc_lnk_stat * lso = &psli->lnk_stat_offsets;
+        LPFC_MBOXQ_t *pmboxq;
+        MAILBOX_t *pmb;
+        int rc = 0;
+
+        pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
+        if (!pmboxq)
+                return;
+        memset(pmboxq, 0, sizeof(LPFC_MBOXQ_t));
+
+        pmb = &pmboxq->mb;
+        pmb->mbxCommand = MBX_READ_STATUS;
+        pmb->mbxOwner = OWN_HOST;
+        pmb->un.varWords[0] = 0x1; /* reset request */
+        pmboxq->context1 = NULL;
+
+        if ((phba->fc_flag & FC_OFFLINE_MODE) ||
+                (!(psli->sli_flag & LPFC_SLI2_ACTIVE)))
+                rc = lpfc_sli_issue_mbox(phba, pmboxq, MBX_POLL);
+        else
+                rc = lpfc_sli_issue_mbox_wait(phba, pmboxq, phba->fc_ratov * 2);
+
+        if (rc != MBX_SUCCESS) {
+                if (rc == MBX_TIMEOUT)
+                        pmboxq->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
+                else
+                        mempool_free(pmboxq, phba->mbox_mem_pool);
+                return;
+        }
+
+        memset(pmboxq, 0, sizeof(LPFC_MBOXQ_t));
+        pmb->mbxCommand = MBX_READ_LNK_STAT;
+        pmb->mbxOwner = OWN_HOST;
+        pmboxq->context1 = NULL;
+
+        if ((phba->fc_flag & FC_OFFLINE_MODE) ||
+            (!(psli->sli_flag & LPFC_SLI2_ACTIVE)))
+                rc = lpfc_sli_issue_mbox(phba, pmboxq, MBX_POLL);
+        else
+                rc = lpfc_sli_issue_mbox_wait(phba, pmboxq, phba->fc_ratov * 2);
+
+        if (rc != MBX_SUCCESS) {
+                if (rc == MBX_TIMEOUT)
+                        pmboxq->mbox_cmpl = lpfc_sli_def_mbox_cmpl;
+                else
+                        mempool_free( pmboxq, phba->mbox_mem_pool);
+                return;
+        }
+
+        lso->link_failure_count = pmb->un.varRdLnk.linkFailureCnt;
+        lso->loss_of_sync_count = pmb->un.varRdLnk.lossSyncCnt;
+        lso->loss_of_signal_count = pmb->un.varRdLnk.lossSignalCnt;
+        lso->prim_seq_protocol_err_count = pmb->un.varRdLnk.primSeqErrCnt;
+        lso->invalid_tx_word_count = pmb->un.varRdLnk.invalidXmitWord;
+        lso->invalid_crc_count = pmb->un.varRdLnk.crcCnt;
+        lso->error_frames = pmb->un.varRdLnk.crcCnt;
+        lso->link_events = (phba->fc_eventTag >> 1);
+
+        psli->stats_start = get_seconds();
+
+        return;
+}
 
 /*
  * The LPFC driver treats linkdown handling as target loss events so there
@@ -1431,8 +1514,7 @@ struct fc_function_template lpfc_transport_functions = {
          */
 
         .get_fc_host_stats = lpfc_get_stats,
-
-        /* the LPFC driver doesn't support resetting stats yet */
+        .reset_fc_host_stats = lpfc_reset_stats,
 
         .dd_fcrport_size = sizeof(struct lpfc_rport_data),
         .show_rport_maxframe_size = 1,
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 350a625fa224..f453fccd67c8 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1792,6 +1792,9 @@ lpfc_sli_brdrestart(struct lpfc_hba * phba)
 
         spin_unlock_irq(phba->host->host_lock);
 
+        memset(&psli->lnk_stat_offsets, 0, sizeof(psli->lnk_stat_offsets));
+        psli->stats_start = get_seconds();
+
         if (skip_post)
                 mdelay(100);
         else
diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h
index d8ef0d2894d4..478e799c2bbf 100644
--- a/drivers/scsi/lpfc/lpfc_sli.h
+++ b/drivers/scsi/lpfc/lpfc_sli.h
@@ -172,6 +172,18 @@ struct lpfc_sli_stat {
         uint32_t mbox_busy;      /* Mailbox cmd busy */
 };
 
+/* Structure to store link status values when port stats are reset */
+struct lpfc_lnk_stat {
+        uint32_t link_failure_count;
+        uint32_t loss_of_sync_count;
+        uint32_t loss_of_signal_count;
+        uint32_t prim_seq_protocol_err_count;
+        uint32_t invalid_tx_word_count;
+        uint32_t invalid_crc_count;
+        uint32_t error_frames;
+        uint32_t link_events;
+};
+
 /* Structure used to hold SLI information */
 struct lpfc_sli {
         uint32_t num_rings;
@@ -201,6 +213,8 @@ struct lpfc_sli {
         struct lpfc_iocbq ** iocbq_lookup; /* array to lookup IOCB by IOTAG */
         size_t iocbq_lookup_len;           /* current lengs of the array */
         uint16_t  last_iotag;              /* last allocated IOTAG */
+        unsigned long  stats_start;        /* in seconds */
+        struct lpfc_lnk_stat lnk_stat_offsets;
 };
 
 /* Given a pointer to the start of the ring, and the slot number of