[SCSI] qla2xxx: Add Fibre Channel Event (FCE) tracing support.

FCE support enables the firmware to record FC extended link
services and basic link services frames which have been
transmitted and received by the ISP.  This allows for a limited
view of the FC traffic through the ISP without using a FC
analyzer.  This can be useful in situations where a physical
connection to the FC bus is not possible.

The driver exports this information in two ways -- first, via a
debugfs node exported for all supported ISPs under:

	<debugfs_mount_point>/qla2xxx/qla2xxx_<host_no>/fce

where a read of the 'fce' file will provide a snapshot of the
firmware's FCE buffer; and finally, the FCE buffer will be
extracted during a firmware-dump scenario.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_dbg.c b/drivers/scsi/qla2xxx/qla_dbg.c
index 796c4ce87831..d88e98c476b0 100644
--- a/drivers/scsi/qla2xxx/qla_dbg.c
+++ b/drivers/scsi/qla2xxx/qla_dbg.c
@@ -1051,6 +1051,7 @@ qla25xx_fw_dump(scsi_qla_host_t *ha, int hardware_locked)
         struct qla25xx_fw_dump *fw;
         uint32_t        ext_mem_cnt;
         void            *nxt;
+        struct qla2xxx_fce_chain *fcec;
 
         risc_address = ext_mem_cnt = 0;
         flags = 0;
@@ -1321,10 +1322,31 @@ qla25xx_fw_dump(scsi_qla_host_t *ha, int hardware_locked)
         if (rval != QLA_SUCCESS)
                 goto qla25xx_fw_dump_failed_0;
 
+        /* Fibre Channel Trace Buffer. */
         nxt = qla2xxx_copy_queues(ha, nxt);
         if (ha->eft)
                 memcpy(nxt, ha->eft, ntohl(ha->fw_dump->eft_size));
 
+        /* Fibre Channel Event Buffer. */
+        if (!ha->fce)
+                goto qla25xx_fw_dump_failed_0;
+
+        ha->fw_dump->version |= __constant_htonl(DUMP_CHAIN_VARIANT);
+
+        fcec = nxt + ntohl(ha->fw_dump->eft_size);
+        fcec->type = __constant_htonl(DUMP_CHAIN_FCE | DUMP_CHAIN_LAST);
+        fcec->chain_size = htonl(sizeof(struct qla2xxx_fce_chain) +
+            fce_calc_size(ha->fce_bufs));
+        fcec->size = htonl(fce_calc_size(ha->fce_bufs));
+        fcec->addr_l = htonl(LSD(ha->fce_dma));
+        fcec->addr_h = htonl(MSD(ha->fce_dma));
+
+        iter_reg = fcec->eregs;
+        for (cnt = 0; cnt < 8; cnt++)
+                *iter_reg++ = htonl(ha->fce_mb[cnt]);
+
+        memcpy(iter_reg, ha->fce, ntohl(fcec->size));
+
 qla25xx_fw_dump_failed_0:
         if (rval != QLA_SUCCESS) {
                 qla_printk(KERN_WARNING, ha,