[PATCH] IB/ipath: fixes to performance get counters for IB compliance

This patch fixes some problems uncovered during IB compliance testing to
return the right values for error counters returned by the Performance Get
Counters packet.
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/hw/ipath/ipath_driver.c

@@ -460,6 +460,8 @@ static int __devinit ipath_init_one(struct pci_dev *pdev,
 	 * by ipath_setup_htconfig.
 	 */
 	dd->ipath_flags = 0;
+	dd->ipath_lli_counter = 0;
+	dd->ipath_lli_errors = 0;
 
 	if (dd->ipath_f_bus(dd, pdev))
 		ipath_dev_err(dd, "Failed to setup config space; "
@@ -942,6 +944,18 @@ void ipath_kreceive(struct ipath_devdata *dd)
 				   "tlen=%x opcode=%x egridx=%x: %s\n",
 				   eflags, l, etype, tlen, bthbytes[0],
 				   ips_get_index((__le32 *) rc), emsg);
+			/* Count local link integrity errors. */
+			if (eflags & (INFINIPATH_RHF_H_ICRCERR |
+				      INFINIPATH_RHF_H_VCRCERR)) {
+				u8 n = (dd->ipath_ibcctrl >>
+					INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT) &
+					INFINIPATH_IBCC_PHYERRTHRESHOLD_MASK;
+
+				if (++dd->ipath_lli_counter > n) {
+					dd->ipath_lli_counter = 0;
+					dd->ipath_lli_errors++;
+				}
+			}
 		} else if (etype == RCVHQ_RCV_TYPE_NON_KD) {
 				int ret = __ipath_verbs_rcv(dd, rc + 1,
 							    ebuf, tlen);
@@ -949,6 +963,9 @@ void ipath_kreceive(struct ipath_devdata *dd)
 					ipath_cdbg(VERBOSE,
 						   "received IB packet, "
 						   "not SMA (QP=%x)\n", qp);
+				if (dd->ipath_lli_counter)
+					dd->ipath_lli_counter--;
+
 		} else if (etype == RCVHQ_RCV_TYPE_EAGER) {
 			if (qp == IPATH_KD_QP &&
 			    bthbytes[0] == ipath_layer_rcv_opcode &&

drivers/infiniband/hw/ipath/ipath_intr.c

@@ -262,6 +262,7 @@ static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
 				     | IPATH_LINKACTIVE |
 				     IPATH_LINKARMED);
 		*dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
+		dd->ipath_lli_counter = 0;
 		if (!noprint) {
 			if (((dd->ipath_lastibcstat >>
 			      INFINIPATH_IBCS_LINKSTATE_SHIFT) &

drivers/infiniband/hw/ipath/ipath_kernel.h

@@ -507,6 +507,11 @@ struct ipath_devdata {
 	u8 ipath_pci_cacheline;
 	/* LID mask control */
 	u8 ipath_lmc;
+
+	/* local link integrity counter */
+	u32 ipath_lli_counter;
+	/* local link integrity errors */
+	u32 ipath_lli_errors;
 };
 
 extern struct list_head ipath_dev_list;

drivers/infiniband/hw/ipath/ipath_layer.c

@@ -1032,19 +1032,22 @@ int ipath_layer_get_counters(struct ipath_devdata *dd,
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_ibsymbolerrcnt);
 	cntrs->link_error_recovery_counter =
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_iblinkerrrecovcnt);
+	/*
+	 * The link downed counter counts when the other side downs the
+	 * connection.  We add in the number of times we downed the link
+	 * due to local link integrity errors to compensate.
+	 */
 	cntrs->link_downed_counter =
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_iblinkdowncnt);
 	cntrs->port_rcv_errors =
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_rxdroppktcnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_rcvovflcnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_portovflcnt) +
-		ipath_snap_cntr(dd, dd->ipath_cregs->cr_errrcvflowctrlcnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_err_rlencnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_invalidrlencnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_erricrccnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_errvcrccnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_errlpcrccnt) +
-		ipath_snap_cntr(dd, dd->ipath_cregs->cr_errlinkcnt) +
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_badformatcnt);
 	cntrs->port_rcv_remphys_errors =
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_rcvebpcnt);
@@ -1058,6 +1061,8 @@ int ipath_layer_get_counters(struct ipath_devdata *dd,
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktsendcnt);
 	cntrs->port_rcv_packets =
 		ipath_snap_cntr(dd, dd->ipath_cregs->cr_pktrcvcnt);
+	cntrs->local_link_integrity_errors = dd->ipath_lli_errors;
+	cntrs->excessive_buffer_overrun_errors = 0; /* XXX */
 
 	ret = 0;
 

drivers/infiniband/hw/ipath/ipath_layer.h

@@ -55,6 +55,8 @@ struct ipath_layer_counters {
 	u64 port_rcv_data;
 	u64 port_xmit_packets;
 	u64 port_rcv_packets;
+	u32 local_link_integrity_errors;
+	u32 excessive_buffer_overrun_errors;
 };
 
 /*

drivers/infiniband/hw/ipath/ipath_mad.c

@@ -613,6 +613,9 @@ struct ib_pma_portcounters {
 #define IB_PMA_SEL_PORT_RCV_ERRORS		__constant_htons(0x0008)
 #define IB_PMA_SEL_PORT_RCV_REMPHYS_ERRORS	__constant_htons(0x0010)
 #define IB_PMA_SEL_PORT_XMIT_DISCARDS		__constant_htons(0x0040)
+#define IB_PMA_SEL_LOCAL_LINK_INTEGRITY_ERRORS	__constant_htons(0x0200)
+#define IB_PMA_SEL_EXCESSIVE_BUFFER_OVERRUNS	__constant_htons(0x0400)
+#define IB_PMA_SEL_PORT_VL15_DROPPED		__constant_htons(0x0800)
 #define IB_PMA_SEL_PORT_XMIT_DATA		__constant_htons(0x1000)
 #define IB_PMA_SEL_PORT_RCV_DATA		__constant_htons(0x2000)
 #define IB_PMA_SEL_PORT_XMIT_PACKETS		__constant_htons(0x4000)
@@ -859,6 +862,10 @@ static int recv_pma_get_portcounters(struct ib_perf *pmp,
 	cntrs.port_rcv_data -= dev->z_port_rcv_data;
 	cntrs.port_xmit_packets -= dev->z_port_xmit_packets;
 	cntrs.port_rcv_packets -= dev->z_port_rcv_packets;
+	cntrs.local_link_integrity_errors -=
+		dev->z_local_link_integrity_errors;
+	cntrs.excessive_buffer_overrun_errors -=
+		dev->z_excessive_buffer_overrun_errors;
 
 	memset(pmp->data, 0, sizeof(pmp->data));
 
@@ -896,6 +903,16 @@ static int recv_pma_get_portcounters(struct ib_perf *pmp,
 	else
 		p->port_xmit_discards =
 			cpu_to_be16((u16)cntrs.port_xmit_discards);
+	if (cntrs.local_link_integrity_errors > 0xFUL)
+		cntrs.local_link_integrity_errors = 0xFUL;
+	if (cntrs.excessive_buffer_overrun_errors > 0xFUL)
+		cntrs.excessive_buffer_overrun_errors = 0xFUL;
+	p->lli_ebor_errors = (cntrs.local_link_integrity_errors << 4) |
+		cntrs.excessive_buffer_overrun_errors;
+	if (dev->n_vl15_dropped > 0xFFFFUL)
+		p->vl15_dropped = __constant_cpu_to_be16(0xFFFF);
+	else
+		p->vl15_dropped = cpu_to_be16((u16)dev->n_vl15_dropped);
 	if (cntrs.port_xmit_data > 0xFFFFFFFFUL)
 		p->port_xmit_data = __constant_cpu_to_be32(0xFFFFFFFF);
 	else
@@ -990,6 +1007,17 @@ static int recv_pma_set_portcounters(struct ib_perf *pmp,
 	if (p->counter_select & IB_PMA_SEL_PORT_XMIT_DISCARDS)
 		dev->z_port_xmit_discards = cntrs.port_xmit_discards;
 
+	if (p->counter_select & IB_PMA_SEL_LOCAL_LINK_INTEGRITY_ERRORS)
+		dev->z_local_link_integrity_errors =
+			cntrs.local_link_integrity_errors;
+
+	if (p->counter_select & IB_PMA_SEL_EXCESSIVE_BUFFER_OVERRUNS)
+		dev->z_excessive_buffer_overrun_errors =
+			cntrs.excessive_buffer_overrun_errors;
+
+	if (p->counter_select & IB_PMA_SEL_PORT_VL15_DROPPED)
+		dev->n_vl15_dropped = 0;
+
 	if (p->counter_select & IB_PMA_SEL_PORT_XMIT_DATA)
 		dev->z_port_xmit_data = cntrs.port_xmit_data;
 
@@ -1275,32 +1303,8 @@ int ipath_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
 		      struct ib_wc *in_wc, struct ib_grh *in_grh,
 		      struct ib_mad *in_mad, struct ib_mad *out_mad)
 {
-	struct ipath_ibdev *dev = to_idev(ibdev);
 	int ret;
 
-	/*
-	 * Snapshot current HW counters to "clear" them.
-	 * This should be done when the driver is loaded except that for
-	 * some reason we get a zillion errors when brining up the link.
-	 */
-	if (dev->rcv_errors == 0) {
-		struct ipath_layer_counters cntrs;
-
-		ipath_layer_get_counters(to_idev(ibdev)->dd, &cntrs);
-		dev->rcv_errors++;
-		dev->z_symbol_error_counter = cntrs.symbol_error_counter;
-		dev->z_link_error_recovery_counter =
-			cntrs.link_error_recovery_counter;
-		dev->z_link_downed_counter = cntrs.link_downed_counter;
-		dev->z_port_rcv_errors = cntrs.port_rcv_errors + 1;
-		dev->z_port_rcv_remphys_errors =
-			cntrs.port_rcv_remphys_errors;
-		dev->z_port_xmit_discards = cntrs.port_xmit_discards;
-		dev->z_port_xmit_data = cntrs.port_xmit_data;
-		dev->z_port_rcv_data = cntrs.port_rcv_data;
-		dev->z_port_xmit_packets = cntrs.port_xmit_packets;
-		dev->z_port_rcv_packets = cntrs.port_rcv_packets;
-	}
 	switch (in_mad->mad_hdr.mgmt_class) {
 	case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
 	case IB_MGMT_CLASS_SUBN_LID_ROUTED:

drivers/infiniband/hw/ipath/ipath_ud.c

@@ -560,7 +560,16 @@ void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 	spin_lock_irqsave(&rq->lock, flags);
 	if (rq->tail == rq->head) {
 		spin_unlock_irqrestore(&rq->lock, flags);
-		dev->n_pkt_drops++;
+		/*
+		 * Count VL15 packets dropped due to no receive buffer.
+		 * Otherwise, count them as buffer overruns since usually,
+		 * the HW will be able to receive packets even if there are
+		 * no QPs with posted receive buffers.
+		 */
+		if (qp->ibqp.qp_num == 0)
+			dev->n_vl15_dropped++;
+		else
+			dev->rcv_errors++;
 		goto bail;
 	}
 	/* Silently drop packets which are too big. */

drivers/infiniband/hw/ipath/ipath_verbs.c

@@ -981,6 +981,7 @@ static int ipath_verbs_register_sysfs(struct ib_device *dev);
  */
 static void *ipath_register_ib_device(int unit, struct ipath_devdata *dd)
 {
+	struct ipath_layer_counters cntrs;
 	struct ipath_ibdev *idev;
 	struct ib_device *dev;
 	int ret;
@@ -1031,6 +1032,25 @@ static void *ipath_register_ib_device(int unit, struct ipath_devdata *dd)
 	idev->pma_counter_select[5] = IB_PMA_PORT_XMIT_WAIT;
 	idev->link_width_enabled = 3;	/* 1x or 4x */
 
+	/* Snapshot current HW counters to "clear" them. */
+	ipath_layer_get_counters(dd, &cntrs);
+	idev->z_symbol_error_counter = cntrs.symbol_error_counter;
+	idev->z_link_error_recovery_counter =
+		cntrs.link_error_recovery_counter;
+	idev->z_link_downed_counter = cntrs.link_downed_counter;
+	idev->z_port_rcv_errors = cntrs.port_rcv_errors;
+	idev->z_port_rcv_remphys_errors =
+		cntrs.port_rcv_remphys_errors;
+	idev->z_port_xmit_discards = cntrs.port_xmit_discards;
+	idev->z_port_xmit_data = cntrs.port_xmit_data;
+	idev->z_port_rcv_data = cntrs.port_rcv_data;
+	idev->z_port_xmit_packets = cntrs.port_xmit_packets;
+	idev->z_port_rcv_packets = cntrs.port_rcv_packets;
+	idev->z_local_link_integrity_errors =
+		cntrs.local_link_integrity_errors;
+	idev->z_excessive_buffer_overrun_errors =
+		cntrs.excessive_buffer_overrun_errors;
+
 	/*
 	 * The system image GUID is supposed to be the same for all
 	 * IB HCAs in a single system but since there can be other

drivers/infiniband/hw/ipath/ipath_verbs.h

@@ -460,6 +460,8 @@ struct ipath_ibdev {
 	u64 z_port_xmit_packets;		/* starting count for PMA */
 	u64 z_port_rcv_packets;			/* starting count for PMA */
 	u32 z_pkey_violations;			/* starting count for PMA */
+	u32 z_local_link_integrity_errors;	/* starting count for PMA */
+	u32 z_excessive_buffer_overrun_errors;	/* starting count for PMA */
 	u32 n_rc_resends;
 	u32 n_rc_acks;
 	u32 n_rc_qacks;
@@ -469,6 +471,7 @@ struct ipath_ibdev {
 	u32 n_other_naks;
 	u32 n_timeouts;
 	u32 n_pkt_drops;
+	u32 n_vl15_dropped;
 	u32 n_wqe_errs;
 	u32 n_rdma_dup_busy;
 	u32 n_piowait;