IB/ipath: Add code to support multiple link speeds and widths

This patch adds code to get/set portinfo to support multiple link speeds
and widths.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ipath/ipath_kernel.h

@@ -801,6 +801,8 @@ void ipath_hol_event(unsigned long);
 /*
  * values for ipath_flags
  */
+		/* chip can report link latency (IB 1.2) */
+#define IPATH_HAS_LINK_LATENCY 0x1
 /* The chip is up and initted */
 #define IPATH_INITTED       0x2
 		/* set if any user code has set kr_rcvhdrsize */

drivers/infiniband/hw/ipath/ipath_mad.c

@@ -146,6 +146,15 @@ static int recv_subn_get_guidinfo(struct ib_smp *smp,
 	return reply(smp);
 }
 
+static void set_link_width_enabled(struct ipath_devdata *dd, u32 w)
+{
+	(void) dd->ipath_f_set_ib_cfg(dd, IPATH_IB_CFG_LWID_ENB, w);
+}
+
+static void set_link_speed_enabled(struct ipath_devdata *dd, u32 s)
+{
+	(void) dd->ipath_f_set_ib_cfg(dd, IPATH_IB_CFG_SPD_ENB, s);
+}
 
 static int get_overrunthreshold(struct ipath_devdata *dd)
 {
@@ -226,6 +235,7 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
 				  struct ib_device *ibdev, u8 port)
 {
 	struct ipath_ibdev *dev;
+	struct ipath_devdata *dd;
 	struct ib_port_info *pip = (struct ib_port_info *)smp->data;
 	u16 lid;
 	u8 ibcstat;
@@ -239,6 +249,7 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
 	}
 
 	dev = to_idev(ibdev);
+	dd = dev->dd;
 
 	/* Clear all fields.  Only set the non-zero fields. */
 	memset(smp->data, 0, sizeof(smp->data));
@@ -248,25 +259,28 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
 	    dev->mkeyprot == 0)
 		pip->mkey = dev->mkey;
 	pip->gid_prefix = dev->gid_prefix;
-	lid = dev->dd->ipath_lid;
+	lid = dd->ipath_lid;
 	pip->lid = lid ? cpu_to_be16(lid) : IB_LID_PERMISSIVE;
 	pip->sm_lid = cpu_to_be16(dev->sm_lid);
 	pip->cap_mask = cpu_to_be32(dev->port_cap_flags);
 	/* pip->diag_code; */
 	pip->mkey_lease_period = cpu_to_be16(dev->mkey_lease_period);
 	pip->local_port_num = port;
-	pip->link_width_enabled = dev->link_width_enabled;
-	pip->link_width_supported = 3;	/* 1x or 4x */
-	pip->link_width_active = 2;	/* 4x */
-	pip->linkspeed_portstate = 0x10;	/* 2.5Gbps */
-	ibcstat = dev->dd->ipath_lastibcstat;
-	pip->linkspeed_portstate |= ((ibcstat >> 4) & 0x3) + 1;
+	pip->link_width_enabled = dd->ipath_link_width_enabled;
+	pip->link_width_supported = dd->ipath_link_width_supported;
+	pip->link_width_active = dd->ipath_link_width_active;
+	pip->linkspeed_portstate = dd->ipath_link_speed_supported << 4;
+	ibcstat = dd->ipath_lastibcstat;
+	/* map LinkState to IB portinfo values.  */
+	pip->linkspeed_portstate |= ipath_ib_linkstate(dd, ibcstat) + 1;
+
 	pip->portphysstate_linkdown =
-		(ipath_cvt_physportstate[ibcstat & 0xf] << 4) |
-		(get_linkdowndefaultstate(dev->dd) ? 1 : 2);
-	pip->mkeyprot_resv_lmc = (dev->mkeyprot << 6) | dev->dd->ipath_lmc;
-	pip->linkspeedactive_enabled = 0x11;	/* 2.5Gbps, 2.5Gbps */
-	switch (dev->dd->ipath_ibmtu) {
+		(ipath_cvt_physportstate[ibcstat & dd->ibcs_lts_mask] << 4) |
+		(get_linkdowndefaultstate(dd) ? 1 : 2);
+	pip->mkeyprot_resv_lmc = (dev->mkeyprot << 6) | dd->ipath_lmc;
+	pip->linkspeedactive_enabled = (dd->ipath_link_speed_active << 4) |
+		dd->ipath_link_speed_enabled;
+	switch (dd->ipath_ibmtu) {
 	case 4096:
 		mtu = IB_MTU_4096;
 		break;
@@ -300,7 +314,7 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
 	pip->mkey_violations = cpu_to_be16(dev->mkey_violations);
 	/* P_KeyViolations are counted by hardware. */
 	pip->pkey_violations =
-		cpu_to_be16((ipath_get_cr_errpkey(dev->dd) -
+		cpu_to_be16((ipath_get_cr_errpkey(dd) -
 			     dev->z_pkey_violations) & 0xFFFF);
 	pip->qkey_violations = cpu_to_be16(dev->qkey_violations);
 	/* Only the hardware GUID is supported for now */
@@ -309,10 +323,17 @@ static int recv_subn_get_portinfo(struct ib_smp *smp,
 	/* 32.768 usec. response time (guessing) */
 	pip->resv_resptimevalue = 3;
 	pip->localphyerrors_overrunerrors =
-		(get_phyerrthreshold(dev->dd) << 4) |
-		get_overrunthreshold(dev->dd);
+		(get_phyerrthreshold(dd) << 4) |
+		get_overrunthreshold(dd);
 	/* pip->max_credit_hint; */
-	/* pip->link_roundtrip_latency[3]; */
+	if (dev->port_cap_flags & IB_PORT_LINK_LATENCY_SUP) {
+		u32 v;
+
+		v = dd->ipath_f_get_ib_cfg(dd, IPATH_IB_CFG_LINKLATENCY);
+		pip->link_roundtrip_latency[0] = v >> 16;
+		pip->link_roundtrip_latency[1] = v >> 8;
+		pip->link_roundtrip_latency[2] = v;
+	}
 
 	ret = reply(smp);
 
@@ -440,19 +461,25 @@ static int recv_subn_set_portinfo(struct ib_smp *smp,
 		ib_dispatch_event(&event);
 	}
 
-	/* Only 4x supported but allow 1x or 4x to be set (see 14.2.6.6). */
+	/* Allow 1x or 4x to be set (see 14.2.6.6). */
 	lwe = pip->link_width_enabled;
-	if ((lwe >= 4 && lwe <= 8) || (lwe >= 0xC && lwe <= 0xFE))
-		goto err;
-	if (lwe == 0xFF)
-		dev->link_width_enabled = 3;	/* 1x or 4x */
-	else if (lwe)
-		dev->link_width_enabled = lwe;
+	if (lwe) {
+		if (lwe == 0xFF)
+			lwe = dd->ipath_link_width_supported;
+		else if (lwe >= 16 || (lwe & ~dd->ipath_link_width_supported))
+			goto err;
+		set_link_width_enabled(dd, lwe);
+	}
 
-	/* Only 2.5 Gbs supported. */
+	/* Allow 2.5 or 5.0 Gbs. */
 	lse = pip->linkspeedactive_enabled & 0xF;
-	if (lse >= 2 && lse <= 0xE)
-		goto err;
+	if (lse) {
+		if (lse == 15)
+			lse = dd->ipath_link_speed_supported;
+		else if (lse >= 8 || (lse & ~dd->ipath_link_speed_supported))
+			goto err;
+		set_link_speed_enabled(dd, lse);
+	}
 
 	/* Set link down default state. */
 	switch (pip->portphysstate_linkdown & 0xF) {
@@ -946,10 +973,14 @@ static int recv_pma_get_portsamplescontrol(struct ib_perf *pmp,
 	 * nsec.  0 == 4 nsec., 1 == 8 nsec., ..., 255 == 1020 nsec.  Sample
 	 * intervals are counted in ticks.  Since we use Linux timers, that
 	 * count in jiffies, we can't sample for less than 1000 ticks if HZ
-	 * == 1000 (4000 ticks if HZ is 250).
+	 * == 1000 (4000 ticks if HZ is 250).  link_speed_active returns 2 for
+	 * DDR, 1 for SDR, set the tick to 1 for DDR, 0 for SDR on chips that
+	 * have hardware support for delaying packets.
 	 */
-	/* XXX This is WRONG. */
-	p->tick = 250;		/* 1 usec. */
+	if (crp->cr_psstat)
+		p->tick = dev->dd->ipath_link_speed_active - 1;
+	else
+		p->tick = 250;		/* 1 usec. */
 	p->counter_width = 4;	/* 32 bit counters */
 	p->counter_mask0_9 = COUNTER_MASK0_9;
 	spin_lock_irqsave(&dev->pending_lock, flags);

drivers/infiniband/hw/ipath/ipath_verbs.c

@@ -1183,7 +1183,9 @@ static int ipath_query_port(struct ib_device *ibdev,
 	props->sm_lid = dev->sm_lid;
 	props->sm_sl = dev->sm_sl;
 	ibcstat = dd->ipath_lastibcstat;
-	props->state = ((ibcstat >> 4) & 0x3) + 1;
+	/* map LinkState to IB portinfo values.  */
+	props->state = ipath_ib_linkstate(dd, ibcstat) + 1;
+
 	/* See phys_state_show() */
 	props->phys_state = /* MEA: assumes shift == 0 */
 		ipath_cvt_physportstate[dd->ipath_lastibcstat &
@@ -1195,9 +1197,9 @@ static int ipath_query_port(struct ib_device *ibdev,
 	props->bad_pkey_cntr = ipath_get_cr_errpkey(dd) -
 		dev->z_pkey_violations;
 	props->qkey_viol_cntr = dev->qkey_violations;
-	props->active_width = IB_WIDTH_4X;
+	props->active_width = dd->ipath_link_width_active;
 	/* See rate_show() */
-	props->active_speed = 1;	/* Regular 10Mbs speed. */
+	props->active_speed = dd->ipath_link_speed_active;
 	props->max_vl_num = 1;		/* VLCap = VL0 */
 	props->init_type_reply = 0;
 
@@ -1629,12 +1631,13 @@ int ipath_register_ib_device(struct ipath_devdata *dd)
 	idev->pending_index = 0;
 	idev->port_cap_flags =
 		IB_PORT_SYS_IMAGE_GUID_SUP | IB_PORT_CLIENT_REG_SUP;
+	if (dd->ipath_flags & IPATH_HAS_LINK_LATENCY)
+		idev->port_cap_flags |= IB_PORT_LINK_LATENCY_SUP;
 	idev->pma_counter_select[0] = IB_PMA_PORT_XMIT_DATA;
 	idev->pma_counter_select[1] = IB_PMA_PORT_RCV_DATA;
 	idev->pma_counter_select[2] = IB_PMA_PORT_XMIT_PKTS;
 	idev->pma_counter_select[3] = IB_PMA_PORT_RCV_PKTS;
 	idev->pma_counter_select[4] = IB_PMA_PORT_XMIT_WAIT;
-	idev->link_width_enabled = 3;	/* 1x or 4x */
 
 	/* Snapshot current HW counters to "clear" them. */
 	ipath_get_counters(dd, &cntrs);