[PATCH 07/13] Async Event Handler

[Steve Wise <swise@opengridcomputing.com>]

Code to handle async events coming from the T3 RDMA Core.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
---

 drivers/infiniband/hw/cxgb3/iwch_ev.c |  228 +++++++++++++++++++++++++++++++++
 1 files changed, 228 insertions(+), 0 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb3/iwch_ev.c b/drivers/infiniband/hw/cxgb3/iwch_ev.c
new file mode 100644
index 0000000..0726fa6
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb3/iwch_ev.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2006 Open Grid Computing, 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/slab.h>
+#include <linux/mman.h>
+#include <net/sock.h>
+#include "iwch_provider.h"
+#include "iwch.h"
+#include "iwch_cm.h"
+#include "cxio_hal.h"
+#include "cxio_wr.h"
+
+static void post_qp_event(struct iwch_dev *rnicp, struct iwch_cq *chp,
+			  struct respQ_msg_t *rsp_msg,
+			  enum ib_event_type ib_event, 
+			  int send_term)
+{
+	struct ib_event event;
+	struct iwch_qp_attributes attrs;
+	struct iwch_qp *qhp;
+
+	printk(KERN_ERR "%s - AE qpid 0x%x opcode %d status 0x%x "
+	       "type %d wrid.hi 0x%x wrid.lo 0x%x \n", __FUNCTION__, 
+	       CQE_QPID(rsp_msg->cqe), CQE_OPCODE(rsp_msg->cqe), 
+	       CQE_STATUS(rsp_msg->cqe), CQE_TYPE(rsp_msg->cqe),
+	       CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
+
+	spin_lock(&rnicp->lock);
+	qhp = rnicp->qpid2ptr[CQE_QPID(rsp_msg->cqe)];
+
+	if (!qhp) {
+		printk(KERN_ERR "%s unaffiliated error 0x%x qpid 0x%x\n", 
+		       __FUNCTION__, CQE_STATUS(rsp_msg->cqe), 
+		       CQE_QPID(rsp_msg->cqe));
+		spin_unlock(&rnicp->lock);
+		return;
+	}
+
+	if ((qhp->attr.state == IWCH_QP_STATE_ERROR) ||
+	    (qhp->attr.state == IWCH_QP_STATE_TERMINATE)) {
+		PDBG("%s AE received after RTS - "
+		     "qp state %d qpid 0x%x status 0x%x\n", __FUNCTION__, 
+		     qhp->attr.state, qhp->wq.qpid, CQE_STATUS(rsp_msg->cqe));
+		spin_unlock(&rnicp->lock);
+		return;
+	}
+
+	atomic_inc(&qhp->refcnt);
+	spin_unlock(&rnicp->lock);
+
+	event.event = ib_event;
+	event.device = chp->ibcq.device;
+	if (ib_event == IB_EVENT_CQ_ERR)
+		event.element.cq = &chp->ibcq;
+	else 
+		event.element.qp = &qhp->ibqp;
+
+	if (qhp->ibqp.event_handler)
+		(*qhp->ibqp.event_handler)(&event, qhp->ibqp.qp_context);
+
+	attrs.next_state = IWCH_QP_STATE_TERMINATE;
+	if (send_term && (qhp->attr.state == IWCH_QP_STATE_RTS) && 
+	    !iwch_modify_qp(qhp->rhp, qhp, IWCH_QP_ATTR_NEXT_STATE, &attrs, 1))
+		iwch_post_terminate(qhp, rsp_msg);
+
+	if (atomic_dec_and_test(&qhp->refcnt))
+		wake_up(&qhp->wait);
+}
+
+void iwch_ev_dispatch(struct cxio_rdev *rdev_p, struct sk_buff *skb)
+{
+	struct iwch_dev *rnicp;
+	struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
+	struct iwch_cq *chp;
+	struct iwch_qp *qhp;
+	u32 cqid = RSPQ_CQID(rsp_msg);
+
+	rnicp = (struct iwch_dev *) rdev_p->ulp;
+	spin_lock(&rnicp->lock);
+	chp = rnicp->cqid2ptr[cqid];
+	qhp = rnicp->qpid2ptr[CQE_QPID(rsp_msg->cqe)];
+	if (!chp || !qhp) {
+		printk(KERN_ERR MOD "BAD AE cqid 0x%x qpid 0x%x opcode %d "
+		       "status 0x%x type %d wrid.hi 0x%x wrid.lo 0x%x \n", 
+		       cqid, CQE_QPID(rsp_msg->cqe), 
+		       CQE_OPCODE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe), 
+		       CQE_TYPE(rsp_msg->cqe), CQE_WRID_HI(rsp_msg->cqe), 
+		       CQE_WRID_LOW(rsp_msg->cqe));
+		spin_unlock(&rnicp->lock);
+		goto out;
+	}
+	iwch_qp_add_ref(&qhp->ibqp);
+	atomic_inc(&chp->refcnt);
+	spin_unlock(&rnicp->lock);
+
+	/* 
+	 * 1) completion of our sending a TERMINATE.
+	 * 2) incoming TERMINATE message.  
+	 */
+	if ((CQE_OPCODE(rsp_msg->cqe) == T3_TERMINATE) && 
+	    (CQE_STATUS(rsp_msg->cqe) == 0)) {
+		if (SQ_TYPE(rsp_msg->cqe)) {
+			PDBG("%s QPID 0x%x ep %p disconnecting\n", 
+			     __FUNCTION__, qhp->wq.qpid, qhp->ep);
+			iwch_ep_disconnect(qhp->ep, 0, GFP_ATOMIC);
+		} else {
+			PDBG("%s post REQ_ERR AE QPID 0x%x\n", __FUNCTION__, 
+			     qhp->wq.qpid);
+			post_qp_event(rnicp, chp, rsp_msg, 
+				      IB_EVENT_QP_REQ_ERR, 0);
+			iwch_ep_disconnect(qhp->ep, 0, GFP_ATOMIC);
+		}
+		goto done;
+	}
+
+	/* Bad incoming Read request */
+	if (SQ_TYPE(rsp_msg->cqe) && 
+	    (CQE_OPCODE(rsp_msg->cqe) == T3_READ_RESP)) {
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_QP_REQ_ERR, 1);
+		goto done;
+	}
+
+	/* Bad incoming write */
+	if (RQ_TYPE(rsp_msg->cqe) && 
+	    (CQE_OPCODE(rsp_msg->cqe) == T3_RDMA_WRITE)) {
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_QP_REQ_ERR, 1);
+		goto done;
+	}
+
+	switch (CQE_STATUS(rsp_msg->cqe)) {
+
+	/* Completion Events */
+	case TPT_ERR_SUCCESS:
+
+		/* 
+		 * Confirm the destination entry if this is a RECV completion.
+		 */
+		if (qhp->ep && SQ_TYPE(rsp_msg->cqe))
+			dst_confirm(qhp->ep->dst);
+		(*chp->ibcq.comp_handler)(&chp->ibcq, chp->ibcq.cq_context);
+		break;
+
+	case TPT_ERR_STAG:
+	case TPT_ERR_PDID:
+	case TPT_ERR_QPID:
+	case TPT_ERR_ACCESS:
+	case TPT_ERR_WRAP:
+	case TPT_ERR_BOUND:
+	case TPT_ERR_INVALIDATE_SHARED_MR:
+	case TPT_ERR_INVALIDATE_MR_WITH_MW_BOUND:
+		printk(KERN_ERR "%s - CQE Err qpid 0x%x opcode %d status 0x%x "
+		       "type %d wrid.hi 0x%x wrid.lo 0x%x \n", __FUNCTION__, 
+		       CQE_QPID(rsp_msg->cqe), CQE_OPCODE(rsp_msg->cqe), 
+		       CQE_STATUS(rsp_msg->cqe), CQE_TYPE(rsp_msg->cqe),
+		       CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
+		(*chp->ibcq.comp_handler)(&chp->ibcq, chp->ibcq.cq_context);
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_QP_ACCESS_ERR, 1);
+		break;
+
+	/* Device Fatal Errors */
+	case TPT_ERR_ECC:
+	case TPT_ERR_ECC_PSTAG:
+	case TPT_ERR_INTERNAL_ERR: 
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_DEVICE_FATAL, 1);
+		break;
+	
+	/* QP Fatal Errors */
+	case TPT_ERR_OUT_OF_RQE:
+	case TPT_ERR_PBL_ADDR_BOUND:
+	case TPT_ERR_CRC:
+	case TPT_ERR_MARKER:
+	case TPT_ERR_PDU_LEN_ERR:
+	case TPT_ERR_DDP_VERSION:
+	case TPT_ERR_RDMA_VERSION:
+	case TPT_ERR_OPCODE:
+	case TPT_ERR_DDP_QUEUE_NUM:
+	case TPT_ERR_MSN:
+	case TPT_ERR_TBIT:
+	case TPT_ERR_MO:
+	case TPT_ERR_MSN_GAP:
+	case TPT_ERR_MSN_RANGE:
+	case TPT_ERR_RQE_ADDR_BOUND:
+	case TPT_ERR_IRD_OVERFLOW:
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_QP_FATAL, 1);
+		break;
+
+	default:
+		printk(KERN_ERR MOD "Unknown T3 status 0x%x QPID 0x%x\n", 
+		       CQE_STATUS(rsp_msg->cqe), qhp->wq.qpid);
+		post_qp_event(rnicp, chp, rsp_msg, IB_EVENT_QP_FATAL, 1);
+		break;
+	}
+done:
+	if (atomic_dec_and_test(&chp->refcnt))
+                wake_up(&chp->wait);
+	iwch_qp_rem_ref(&qhp->ibqp);
+out:
+	dev_kfree_skb_irq(skb);
+}