1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_ruc.c b/drivers/infiniband/hw/qib/qib_ruc.c
new file mode 100644
index 000000000..1fa21938f
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_ruc.c
@@ -0,0 +1,314 @@
+/*
+ * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
+ * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/spinlock.h>
+#include <rdma/ib_smi.h>
+
+#include "qib.h"
+#include "qib_mad.h"
+
+/*
+ * Switch to alternate path.
+ * The QP s_lock should be held and interrupts disabled.
+ */
+void qib_migrate_qp(struct rvt_qp *qp)
+{
+	struct ib_event ev;
+
+	qp->s_mig_state = IB_MIG_MIGRATED;
+	qp->remote_ah_attr = qp->alt_ah_attr;
+	qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr);
+	qp->s_pkey_index = qp->s_alt_pkey_index;
+
+	ev.device = qp->ibqp.device;
+	ev.element.qp = &qp->ibqp;
+	ev.event = IB_EVENT_PATH_MIG;
+	qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
+}
+
+static __be64 get_sguid(struct qib_ibport *ibp, unsigned index)
+{
+	if (!index) {
+		struct qib_pportdata *ppd = ppd_from_ibp(ibp);
+
+		return ppd->guid;
+	}
+	return ibp->guids[index - 1];
+}
+
+static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id)
+{
+	return (gid->global.interface_id == id &&
+		(gid->global.subnet_prefix == gid_prefix ||
+		 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX));
+}
+
+/*
+ *
+ * This should be called with the QP r_lock held.
+ *
+ * The s_lock will be acquired around the qib_migrate_qp() call.
+ */
+int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr,
+		      int has_grh, struct rvt_qp *qp, u32 bth0)
+{
+	__be64 guid;
+	unsigned long flags;
+
+	if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) {
+		if (!has_grh) {
+			if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
+			    IB_AH_GRH)
+				goto err;
+		} else {
+			const struct ib_global_route *grh;
+
+			if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) &
+			      IB_AH_GRH))
+				goto err;
+			grh = rdma_ah_read_grh(&qp->alt_ah_attr);
+			guid = get_sguid(ibp, grh->sgid_index);
+			if (!gid_ok(&hdr->u.l.grh.dgid,
+				    ibp->rvp.gid_prefix, guid))
+				goto err;
+			if (!gid_ok(&hdr->u.l.grh.sgid,
+			    grh->dgid.global.subnet_prefix,
+			    grh->dgid.global.interface_id))
+				goto err;
+		}
+		if (!qib_pkey_ok((u16)bth0,
+				 qib_get_pkey(ibp, qp->s_alt_pkey_index))) {
+			qib_bad_pkey(ibp,
+				     (u16)bth0,
+				     (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
+				     0, qp->ibqp.qp_num,
+				     hdr->lrh[3], hdr->lrh[1]);
+			goto err;
+		}
+		/* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */
+		if ((be16_to_cpu(hdr->lrh[3]) !=
+		     rdma_ah_get_dlid(&qp->alt_ah_attr)) ||
+		    ppd_from_ibp(ibp)->port !=
+			    rdma_ah_get_port_num(&qp->alt_ah_attr))
+			goto err;
+		spin_lock_irqsave(&qp->s_lock, flags);
+		qib_migrate_qp(qp);
+		spin_unlock_irqrestore(&qp->s_lock, flags);
+	} else {
+		if (!has_grh) {
+			if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
+			    IB_AH_GRH)
+				goto err;
+		} else {
+			const struct ib_global_route *grh;
+
+			if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) &
+			      IB_AH_GRH))
+				goto err;
+			grh = rdma_ah_read_grh(&qp->remote_ah_attr);
+			guid = get_sguid(ibp, grh->sgid_index);
+			if (!gid_ok(&hdr->u.l.grh.dgid,
+				    ibp->rvp.gid_prefix, guid))
+				goto err;
+			if (!gid_ok(&hdr->u.l.grh.sgid,
+			    grh->dgid.global.subnet_prefix,
+			    grh->dgid.global.interface_id))
+				goto err;
+		}
+		if (!qib_pkey_ok((u16)bth0,
+				 qib_get_pkey(ibp, qp->s_pkey_index))) {
+			qib_bad_pkey(ibp,
+				     (u16)bth0,
+				     (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF,
+				     0, qp->ibqp.qp_num,
+				     hdr->lrh[3], hdr->lrh[1]);
+			goto err;
+		}
+		/* Validate the SLID. See Ch. 9.6.1.5 */
+		if (be16_to_cpu(hdr->lrh[3]) !=
+		    rdma_ah_get_dlid(&qp->remote_ah_attr) ||
+		    ppd_from_ibp(ibp)->port != qp->port_num)
+			goto err;
+		if (qp->s_mig_state == IB_MIG_REARM &&
+		    !(bth0 & IB_BTH_MIG_REQ))
+			qp->s_mig_state = IB_MIG_ARMED;
+	}
+
+	return 0;
+
+err:
+	return 1;
+}
+
+/**
+ * qib_make_grh - construct a GRH header
+ * @ibp: a pointer to the IB port
+ * @hdr: a pointer to the GRH header being constructed
+ * @grh: the global route address to send to
+ * @hwords: the number of 32 bit words of header being sent
+ * @nwords: the number of 32 bit words of data being sent
+ *
+ * Return the size of the header in 32 bit words.
+ */
+u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
+		 const struct ib_global_route *grh, u32 hwords, u32 nwords)
+{
+	hdr->version_tclass_flow =
+		cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) |
+			    (grh->traffic_class << IB_GRH_TCLASS_SHIFT) |
+			    (grh->flow_label << IB_GRH_FLOW_SHIFT));
+	hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
+	/* next_hdr is defined by C8-7 in ch. 8.4.1 */
+	hdr->next_hdr = IB_GRH_NEXT_HDR;
+	hdr->hop_limit = grh->hop_limit;
+	/* The SGID is 32-bit aligned. */
+	hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
+	if (!grh->sgid_index)
+		hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
+	else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
+		hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
+	hdr->dgid = grh->dgid;
+
+	/* GRH header size in 32-bit words. */
+	return sizeof(struct ib_grh) / sizeof(u32);
+}
+
+void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr,
+			 u32 bth0, u32 bth2)
+{
+	struct qib_qp_priv *priv = qp->priv;
+	struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+	u16 lrh0;
+	u32 nwords;
+	u32 extra_bytes;
+
+	/* Construct the header. */
+	extra_bytes = -qp->s_cur_size & 3;
+	nwords = (qp->s_cur_size + extra_bytes) >> 2;
+	lrh0 = QIB_LRH_BTH;
+	if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) {
+		qp->s_hdrwords +=
+			qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
+				     rdma_ah_read_grh(&qp->remote_ah_attr),
+				     qp->s_hdrwords, nwords);
+		lrh0 = QIB_LRH_GRH;
+	}
+	lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 |
+		rdma_ah_get_sl(&qp->remote_ah_attr) << 4;
+	priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
+	priv->s_hdr->lrh[1] =
+			cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr));
+	priv->s_hdr->lrh[2] =
+			cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
+	priv->s_hdr->lrh[3] =
+		cpu_to_be16(ppd_from_ibp(ibp)->lid |
+			    rdma_ah_get_path_bits(&qp->remote_ah_attr));
+	bth0 |= qib_get_pkey(ibp, qp->s_pkey_index);
+	bth0 |= extra_bytes << 20;
+	if (qp->s_mig_state == IB_MIG_MIGRATED)
+		bth0 |= IB_BTH_MIG_REQ;
+	ohdr->bth[0] = cpu_to_be32(bth0);
+	ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
+	ohdr->bth[2] = cpu_to_be32(bth2);
+	this_cpu_inc(ibp->pmastats->n_unicast_xmit);
+}
+
+void _qib_do_send(struct work_struct *work)
+{
+	struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv,
+						s_work);
+	struct rvt_qp *qp = priv->owner;
+
+	qib_do_send(qp);
+}
+
+/**
+ * qib_do_send - perform a send on a QP
+ * @qp: pointer to the QP
+ *
+ * Process entries in the send work queue until credit or queue is
+ * exhausted.  Only allow one CPU to send a packet per QP (tasklet).
+ * Otherwise, two threads could send packets out of order.
+ */
+void qib_do_send(struct rvt_qp *qp)
+{
+	struct qib_qp_priv *priv = qp->priv;
+	struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+	struct qib_pportdata *ppd = ppd_from_ibp(ibp);
+	int (*make_req)(struct rvt_qp *qp, unsigned long *flags);
+	unsigned long flags;
+
+	if ((qp->ibqp.qp_type == IB_QPT_RC ||
+	     qp->ibqp.qp_type == IB_QPT_UC) &&
+	    (rdma_ah_get_dlid(&qp->remote_ah_attr) &
+	     ~((1 << ppd->lmc) - 1)) == ppd->lid) {
+		rvt_ruc_loopback(qp);
+		return;
+	}
+
+	if (qp->ibqp.qp_type == IB_QPT_RC)
+		make_req = qib_make_rc_req;
+	else if (qp->ibqp.qp_type == IB_QPT_UC)
+		make_req = qib_make_uc_req;
+	else
+		make_req = qib_make_ud_req;
+
+	spin_lock_irqsave(&qp->s_lock, flags);
+
+	/* Return if we are already busy processing a work request. */
+	if (!qib_send_ok(qp)) {
+		spin_unlock_irqrestore(&qp->s_lock, flags);
+		return;
+	}
+
+	qp->s_flags |= RVT_S_BUSY;
+
+	do {
+		/* Check for a constructed packet to be sent. */
+		if (qp->s_hdrwords != 0) {
+			spin_unlock_irqrestore(&qp->s_lock, flags);
+			/*
+			 * If the packet cannot be sent now, return and
+			 * the send tasklet will be woken up later.
+			 */
+			if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
+					   qp->s_cur_sge, qp->s_cur_size))
+				return;
+			/* Record that s_hdr is empty. */
+			qp->s_hdrwords = 0;
+			spin_lock_irqsave(&qp->s_lock, flags);
+		}
+	} while (make_req(qp, &flags));
+
+	spin_unlock_irqrestore(&qp->s_lock, flags);
+}