1 files changed, 173 insertions, 21 deletions

diff --git a/drivers/infiniband/hw/qib/qib_driver.c b/drivers/infiniband/hw/qib/qib_driver.c
index 9cd193603fb..5bee08f16d7 100644
--- a/drivers/infiniband/hw/qib/qib_driver.c
+++ b/drivers/infiniband/hw/qib/qib_driver.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2013 Intel Corporation. All rights reserved.
  * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
  *
@@ -37,6 +38,8 @@
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/prefetch.h>
 
 #include "qib.h"
 
@@ -44,7 +47,7 @@
  * The size has to be longer than this string, so we can append
  * board/chip information to it in the init code.
  */
-const char ib_qib_version[] = QIB_IDSTR "\n";
+const char ib_qib_version[] = QIB_DRIVER_VERSION "\n";
 
 DEFINE_SPINLOCK(qib_devs_lock);
 LIST_HEAD(qib_dev_list);
@@ -61,8 +64,9 @@ MODULE_PARM_DESC(compat_ddr_negotiate,
 		 "Attempt pre-IBTA 1.2 DDR speed negotiation");
 
 MODULE_LICENSE("Dual BSD/GPL");
-MODULE_AUTHOR("QLogic <support@qlogic.com>");
-MODULE_DESCRIPTION("QLogic IB driver");
+MODULE_AUTHOR("Intel <ibsupport@intel.com>");
+MODULE_DESCRIPTION("Intel IB driver");
+MODULE_VERSION(QIB_DRIVER_VERSION);
 
 /*
  * QIB_PIO_MAXIBHDR is the max IB header size allowed for in our
@@ -71,6 +75,11 @@ MODULE_DESCRIPTION("QLogic IB driver");
  */
 #define QIB_PIO_MAXIBHDR 128
 
+/*
+ * QIB_MAX_PKT_RCV is the max # if packets processed per receive interrupt.
+ */
+#define QIB_MAX_PKT_RECV 64
+
 struct qlogic_ib_stats qib_stats;
 
 const char *qib_get_unit_name(int unit)
@@ -274,24 +283,151 @@ bail:
  */
 static inline void *qib_get_egrbuf(const struct qib_ctxtdata *rcd, u32 etail)
 {
-	const u32 chunk = etail / rcd->rcvegrbufs_perchunk;
-	const u32 idx =  etail % rcd->rcvegrbufs_perchunk;
+	const u32 chunk = etail >> rcd->rcvegrbufs_perchunk_shift;
+	const u32 idx =  etail & ((u32)rcd->rcvegrbufs_perchunk - 1);
 
-	return rcd->rcvegrbuf[chunk] + idx * rcd->dd->rcvegrbufsize;
+	return rcd->rcvegrbuf[chunk] + (idx << rcd->dd->rcvegrbufsize_shift);
 }
 
 /*
  * Returns 1 if error was a CRC, else 0.
  * Needed for some chip's synthesized error counters.
  */
-static u32 qib_rcv_hdrerr(struct qib_pportdata *ppd, u32 ctxt,
-			  u32 eflags, u32 l, u32 etail, __le32 *rhf_addr,
-			  struct qib_message_header *hdr)
+static u32 qib_rcv_hdrerr(struct qib_ctxtdata *rcd, struct qib_pportdata *ppd,
+			  u32 ctxt, u32 eflags, u32 l, u32 etail,
+			  __le32 *rhf_addr, struct qib_message_header *rhdr)
 {
 	u32 ret = 0;
 
 	if (eflags & (QLOGIC_IB_RHF_H_ICRCERR | QLOGIC_IB_RHF_H_VCRCERR))
 		ret = 1;
+	else if (eflags == QLOGIC_IB_RHF_H_TIDERR) {
+		/* For TIDERR and RC QPs premptively schedule a NAK */
+		struct qib_ib_header *hdr = (struct qib_ib_header *) rhdr;
+		struct qib_other_headers *ohdr = NULL;
+		struct qib_ibport *ibp = &ppd->ibport_data;
+		struct qib_qp *qp = NULL;
+		u32 tlen = qib_hdrget_length_in_bytes(rhf_addr);
+		u16 lid  = be16_to_cpu(hdr->lrh[1]);
+		int lnh = be16_to_cpu(hdr->lrh[0]) & 3;
+		u32 qp_num;
+		u32 opcode;
+		u32 psn;
+		int diff;
+
+		/* Sanity check packet */
+		if (tlen < 24)
+			goto drop;
+
+		if (lid < QIB_MULTICAST_LID_BASE) {
+			lid &= ~((1 << ppd->lmc) - 1);
+			if (unlikely(lid != ppd->lid))
+				goto drop;
+		}
+
+		/* Check for GRH */
+		if (lnh == QIB_LRH_BTH)
+			ohdr = &hdr->u.oth;
+		else if (lnh == QIB_LRH_GRH) {
+			u32 vtf;
+
+			ohdr = &hdr->u.l.oth;
+			if (hdr->u.l.grh.next_hdr != IB_GRH_NEXT_HDR)
+				goto drop;
+			vtf = be32_to_cpu(hdr->u.l.grh.version_tclass_flow);
+			if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
+				goto drop;
+		} else
+			goto drop;
+
+		/* Get opcode and PSN from packet */
+		opcode = be32_to_cpu(ohdr->bth[0]);
+		opcode >>= 24;
+		psn = be32_to_cpu(ohdr->bth[2]);
+
+		/* Get the destination QP number. */
+		qp_num = be32_to_cpu(ohdr->bth[1]) & QIB_QPN_MASK;
+		if (qp_num != QIB_MULTICAST_QPN) {
+			int ruc_res;
+			qp = qib_lookup_qpn(ibp, qp_num);
+			if (!qp)
+				goto drop;
+
+			/*
+			 * Handle only RC QPs - for other QP types drop error
+			 * packet.
+			 */
+			spin_lock(&qp->r_lock);
+
+			/* Check for valid receive state. */
+			if (!(ib_qib_state_ops[qp->state] &
+			      QIB_PROCESS_RECV_OK)) {
+				ibp->n_pkt_drops++;
+				goto unlock;
+			}
+
+			switch (qp->ibqp.qp_type) {
+			case IB_QPT_RC:
+				ruc_res =
+					qib_ruc_check_hdr(
+						ibp, hdr,
+						lnh == QIB_LRH_GRH,
+						qp,
+						be32_to_cpu(ohdr->bth[0]));
+				if (ruc_res)
+					goto unlock;
+
+				/* Only deal with RDMA Writes for now */
+				if (opcode <
+				    IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) {
+					diff = qib_cmp24(psn, qp->r_psn);
+					if (!qp->r_nak_state && diff >= 0) {
+						ibp->n_rc_seqnak++;
+						qp->r_nak_state =
+							IB_NAK_PSN_ERROR;
+						/* Use the expected PSN. */
+						qp->r_ack_psn = qp->r_psn;
+						/*
+						 * Wait to send the sequence
+						 * NAK until all packets
+						 * in the receive queue have
+						 * been processed.
+						 * Otherwise, we end up
+						 * propagating congestion.
+						 */
+						if (list_empty(&qp->rspwait)) {
+							qp->r_flags |=
+								QIB_R_RSP_NAK;
+							atomic_inc(
+								&qp->refcount);
+							list_add_tail(
+							 &qp->rspwait,
+							 &rcd->qp_wait_list);
+						}
+					} /* Out of sequence NAK */
+				} /* QP Request NAKs */
+				break;
+			case IB_QPT_SMI:
+			case IB_QPT_GSI:
+			case IB_QPT_UD:
+			case IB_QPT_UC:
+			default:
+				/* For now don't handle any other QP types */
+				break;
+			}
+
+unlock:
+			spin_unlock(&qp->r_lock);
+			/*
+			 * Notify qib_destroy_qp() if it is waiting
+			 * for us to finish.
+			 */
+			if (atomic_dec_and_test(&qp->refcount))
+				wake_up(&qp->wait);
+		} /* Unicast QP */
+	} /* Valid packet with TIDErr */
+
+drop:
 	return ret;
 }
 
@@ -335,7 +471,7 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
 		smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
 	}
 
-	for (last = 0, i = 1; !last && i <= 64; i += !last) {
+	for (last = 0, i = 1; !last; i += !last) {
 		hdr = dd->f_get_msgheader(dd, rhf_addr);
 		eflags = qib_hdrget_err_flags(rhf_addr);
 		etype = qib_hdrget_rcv_type(rhf_addr);
@@ -348,8 +484,10 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
 			etail = qib_hdrget_index(rhf_addr);
 			updegr = 1;
 			if (tlen > sizeof(*hdr) ||
-			    etype >= RCVHQ_RCV_TYPE_NON_KD)
+			    etype >= RCVHQ_RCV_TYPE_NON_KD) {
 				ebuf = qib_get_egrbuf(rcd, etail);
+				prefetch_range(ebuf, tlen - sizeof(*hdr));
+			}
 		}
 		if (!eflags) {
 			u16 lrh_len = be16_to_cpu(hdr->lrh[2]) << 2;
@@ -371,7 +509,7 @@ u32 qib_kreceive(struct qib_ctxtdata *rcd, u32 *llic, u32 *npkts)
 		 * packets; only qibhdrerr should be set.
 		 */
 		if (unlikely(eflags))
-			crcs += qib_rcv_hdrerr(ppd, rcd->ctxt, eflags, l,
+			crcs += qib_rcv_hdrerr(rcd, ppd, rcd->ctxt, eflags, l,
 					       etail, rhf_addr, hdr);
 		else if (etype == RCVHQ_RCV_TYPE_NON_KD) {
 			qib_ib_rcv(rcd, hdr, ebuf, tlen);
@@ -384,6 +522,9 @@ move_along:
 		l += rsize;
 		if (l >= maxcnt)
 			l = 0;
+		if (i == QIB_MAX_PKT_RECV)
+			last = 1;
+
 		rhf_addr = (__le32 *) rcd->rcvhdrq + l + dd->rhf_offset;
 		if (dd->flags & QIB_NODMA_RTAIL) {
 			u32 seq = qib_hdrget_seq(rhf_addr);
@@ -402,13 +543,21 @@ move_along:
 		 */
 		lval = l;
 		if (!last && !(i & 0xf)) {
-			dd->f_update_usrhead(rcd, lval, updegr, etail);
+			dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 			updegr = 0;
 		}
 	}
+	/*
+	 * Notify qib_destroy_qp() if it is waiting
+	 * for lookaside_qp to finish.
+	 */
+	if (rcd->lookaside_qp) {
+		if (atomic_dec_and_test(&rcd->lookaside_qp->refcount))
+			wake_up(&rcd->lookaside_qp->wait);
+		rcd->lookaside_qp = NULL;
+	}
 
 	rcd->head = l;
-	rcd->pkt_count += i;
 
 	/*
 	 * Iterate over all QPs waiting to respond.
@@ -444,7 +593,7 @@ bail:
 	 * if no packets were processed.
 	 */
 	lval = (u64)rcd->head | dd->rhdrhead_intr_off;
-	dd->f_update_usrhead(rcd, lval, updegr, etail);
+	dd->f_update_usrhead(rcd, lval, updegr, etail, i);
 	return crcs;
 }
 
@@ -616,8 +765,9 @@ int qib_reset_device(int unit)
 	qib_devinfo(dd->pcidev, "Reset on unit %u requested\n", unit);
 
 	if (!dd->kregbase || !(dd->flags & QIB_PRESENT)) {
-		qib_devinfo(dd->pcidev, "Invalid unit number %u or "
-			    "not initialized or not present\n", unit);
+		qib_devinfo(dd->pcidev,
+			"Invalid unit number %u or not initialized or not present\n",
+			unit);
 		ret = -ENXIO;
 		goto bail;
 	}
@@ -654,11 +804,13 @@ int qib_reset_device(int unit)
 	else
 		ret = -EAGAIN;
 	if (ret)
-		qib_dev_err(dd, "Reinitialize unit %u after "
-			    "reset failed with %d\n", unit, ret);
+		qib_dev_err(dd,
+			"Reinitialize unit %u after reset failed with %d\n",
+			unit, ret);
 	else
-		qib_devinfo(dd->pcidev, "Reinitialized unit %u after "
-			    "resetting\n", unit);
+		qib_devinfo(dd->pcidev,
+			"Reinitialized unit %u after resetting\n",
+			unit);
 
 bail:
 	return ret;