[SCSI] libfc: adds FCP failures stats

Adds stats to track FCP pkt and frame alloc
failure.

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Acked-by : Robert Love <robert.w.love@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/libfc/fc_fcp.c

@@ -158,6 +158,9 @@ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
 		fsp->timer.data = (unsigned long)fsp;
 		INIT_LIST_HEAD(&fsp->list);
 		spin_lock_init(&fsp->scsi_pkt_lock);
+	} else {
+		per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
+		put_cpu();
 	}
 	return fsp;
 }
@@ -264,6 +267,9 @@ static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
 	if (!fsp->seq_ptr)
 		return -EINVAL;
 
+	per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
+	put_cpu();
+
 	fsp->state |= FC_SRB_ABORT_PENDING;
 	return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
 }
@@ -420,6 +426,8 @@ static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
 	if (likely(fp))
 		return fp;
 
+	per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
+	put_cpu();
 	/* error case */
 	fc_fcp_can_queue_ramp_down(lport);
 	return NULL;