/*
- * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved.
+ * Copyright (c) 2006, 2007, 2008 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
* ipath_insert_rnr_queue - put QP on the RNR timeout list for the device
* @qp: the QP
*
+ * Called with the QP s_lock held and interrupts disabled.
* XXX Use a simple list for now. We might need a priority
* queue if we have lots of QPs waiting for RNR timeouts
* but that should be rare.
void ipath_insert_rnr_queue(struct ipath_qp *qp)
{
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
- unsigned long flags;
- spin_lock_irqsave(&dev->pending_lock, flags);
+ /* We already did a spin_lock_irqsave(), so just use spin_lock */
+ spin_lock(&dev->pending_lock);
if (list_empty(&dev->rnrwait))
list_add(&qp->timerwait, &dev->rnrwait);
else {
nqp->s_rnr_timeout -= qp->s_rnr_timeout;
list_add(&qp->timerwait, l);
}
- spin_unlock_irqrestore(&dev->pending_lock, flags);
+ spin_unlock(&dev->pending_lock);
}
/**
goto bail;
bad_lkey:
+ memset(&wc, 0, sizeof(wc));
wc.wr_id = wqe->wr_id;
wc.status = IB_WC_LOC_PROT_ERR;
wc.opcode = IB_WC_RECV;
- wc.vendor_err = 0;
- wc.byte_len = 0;
- wc.imm_data = 0;
wc.qp = &qp->ibqp;
- wc.src_qp = 0;
- wc.wc_flags = 0;
- wc.pkey_index = 0;
- wc.slid = 0;
- wc.sl = 0;
- wc.dlid_path_bits = 0;
- wc.port_num = 0;
/* Signal solicited completion event. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
ret = 0;
}
spin_lock_irqsave(&rq->lock, flags);
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
+ ret = 0;
+ goto unlock;
+ }
+
wq = rq->wq;
tail = wq->tail;
/* Validate tail before using it since it is user writable. */
tail = 0;
do {
if (unlikely(tail == wq->head)) {
- spin_unlock_irqrestore(&rq->lock, flags);
ret = 0;
- goto bail;
+ goto unlock;
}
/* Make sure entry is read after head index is read. */
smp_rmb();
wq->tail = tail;
ret = 1;
- qp->r_wrid_valid = 1;
+ set_bit(IPATH_R_WRID_VALID, &qp->r_aflags);
if (handler) {
u32 n;
goto bail;
}
}
+unlock:
spin_unlock_irqrestore(&rq->lock, flags);
-
bail:
return ret;
}
struct ib_wc wc;
u64 sdata;
atomic64_t *maddr;
+ enum ib_wc_status send_status;
+ /*
+ * Note that we check the responder QP state after
+ * checking the requester's state.
+ */
qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
- if (!qp) {
- dev->n_pkt_drops++;
- return;
- }
-again:
spin_lock_irqsave(&sqp->s_lock, flags);
- if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) ||
- sqp->s_rnr_timeout) {
- spin_unlock_irqrestore(&sqp->s_lock, flags);
- goto done;
- }
+ /* Return if we are already busy processing a work request. */
+ if ((sqp->s_flags & (IPATH_S_BUSY | IPATH_S_ANY_WAIT)) ||
+ !(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_OR_FLUSH_SEND))
+ goto unlock;
- /* Get the next send request. */
- if (sqp->s_last == sqp->s_head) {
- /* Send work queue is empty. */
- spin_unlock_irqrestore(&sqp->s_lock, flags);
- goto done;
+ sqp->s_flags |= IPATH_S_BUSY;
+
+again:
+ if (sqp->s_last == sqp->s_head)
+ goto clr_busy;
+ wqe = get_swqe_ptr(sqp, sqp->s_last);
+
+ /* Return if it is not OK to start a new work reqeust. */
+ if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_NEXT_SEND_OK)) {
+ if (!(ib_ipath_state_ops[sqp->state] & IPATH_FLUSH_SEND))
+ goto clr_busy;
+ /* We are in the error state, flush the work request. */
+ send_status = IB_WC_WR_FLUSH_ERR;
+ goto flush_send;
}
/*
* We can rely on the entry not changing without the s_lock
* being held until we update s_last.
+ * We increment s_cur to indicate s_last is in progress.
*/
- wqe = get_swqe_ptr(sqp, sqp->s_last);
+ if (sqp->s_last == sqp->s_cur) {
+ if (++sqp->s_cur >= sqp->s_size)
+ sqp->s_cur = 0;
+ }
spin_unlock_irqrestore(&sqp->s_lock, flags);
- wc.wc_flags = 0;
- wc.imm_data = 0;
+ if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
+ dev->n_pkt_drops++;
+ /*
+ * For RC, the requester would timeout and retry so
+ * shortcut the timeouts and just signal too many retries.
+ */
+ if (sqp->ibqp.qp_type == IB_QPT_RC)
+ send_status = IB_WC_RETRY_EXC_ERR;
+ else
+ send_status = IB_WC_SUCCESS;
+ goto serr;
+ }
+
+ memset(&wc, 0, sizeof wc);
+ send_status = IB_WC_SUCCESS;
sqp->s_sge.sge = wqe->sg_list[0];
sqp->s_sge.sg_list = wqe->sg_list + 1;
switch (wqe->wr.opcode) {
case IB_WR_SEND_WITH_IMM:
wc.wc_flags = IB_WC_WITH_IMM;
- wc.imm_data = wqe->wr.imm_data;
+ wc.ex.imm_data = wqe->wr.ex.imm_data;
/* FALLTHROUGH */
case IB_WR_SEND:
- if (!ipath_get_rwqe(qp, 0)) {
- rnr_nak:
- /* Handle RNR NAK */
- if (qp->ibqp.qp_type == IB_QPT_UC)
- goto send_comp;
- if (sqp->s_rnr_retry == 0) {
- wc.status = IB_WC_RNR_RETRY_EXC_ERR;
- goto err;
- }
- if (sqp->s_rnr_retry_cnt < 7)
- sqp->s_rnr_retry--;
- dev->n_rnr_naks++;
- sqp->s_rnr_timeout =
- ib_ipath_rnr_table[qp->r_min_rnr_timer];
- ipath_insert_rnr_queue(sqp);
- goto done;
- }
+ if (!ipath_get_rwqe(qp, 0))
+ goto rnr_nak;
break;
case IB_WR_RDMA_WRITE_WITH_IMM:
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_WRITE))) {
- wc.status = IB_WC_REM_INV_REQ_ERR;
- goto err;
- }
+ if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
+ goto inv_err;
wc.wc_flags = IB_WC_WITH_IMM;
- wc.imm_data = wqe->wr.imm_data;
+ wc.ex.imm_data = wqe->wr.ex.imm_data;
if (!ipath_get_rwqe(qp, 1))
goto rnr_nak;
/* FALLTHROUGH */
case IB_WR_RDMA_WRITE:
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_WRITE))) {
- wc.status = IB_WC_REM_INV_REQ_ERR;
- goto err;
- }
+ if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
+ goto inv_err;
if (wqe->length == 0)
break;
if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length,
wqe->wr.wr.rdma.remote_addr,
wqe->wr.wr.rdma.rkey,
- IB_ACCESS_REMOTE_WRITE))) {
- acc_err:
- wc.status = IB_WC_REM_ACCESS_ERR;
- err:
- wc.wr_id = wqe->wr.wr_id;
- wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
- wc.vendor_err = 0;
- wc.byte_len = 0;
- wc.qp = &sqp->ibqp;
- wc.src_qp = sqp->remote_qpn;
- wc.pkey_index = 0;
- wc.slid = sqp->remote_ah_attr.dlid;
- wc.sl = sqp->remote_ah_attr.sl;
- wc.dlid_path_bits = 0;
- wc.port_num = 0;
- spin_lock_irqsave(&sqp->s_lock, flags);
- ipath_sqerror_qp(sqp, &wc);
- spin_unlock_irqrestore(&sqp->s_lock, flags);
- goto done;
- }
+ IB_ACCESS_REMOTE_WRITE)))
+ goto acc_err;
break;
case IB_WR_RDMA_READ:
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_READ))) {
- wc.status = IB_WC_REM_INV_REQ_ERR;
- goto err;
- }
+ if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
+ goto inv_err;
if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length,
wqe->wr.wr.rdma.remote_addr,
wqe->wr.wr.rdma.rkey,
case IB_WR_ATOMIC_CMP_AND_SWP:
case IB_WR_ATOMIC_FETCH_AND_ADD:
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_ATOMIC))) {
- wc.status = IB_WC_REM_INV_REQ_ERR;
- goto err;
- }
+ if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
+ goto inv_err;
if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64),
wqe->wr.wr.atomic.remote_addr,
wqe->wr.wr.atomic.rkey,
goto send_comp;
default:
- goto done;
+ send_status = IB_WC_LOC_QP_OP_ERR;
+ goto serr;
}
sge = &sqp->s_sge.sge;
sqp->s_len -= len;
}
- if (wqe->wr.opcode == IB_WR_RDMA_WRITE ||
- wqe->wr.opcode == IB_WR_RDMA_READ)
+ if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags))
goto send_comp;
if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
wc.opcode = IB_WC_RECV;
wc.wr_id = qp->r_wr_id;
wc.status = IB_WC_SUCCESS;
- wc.vendor_err = 0;
wc.byte_len = wqe->length;
wc.qp = &qp->ibqp;
wc.src_qp = qp->remote_qpn;
- wc.pkey_index = 0;
wc.slid = qp->remote_ah_attr.dlid;
wc.sl = qp->remote_ah_attr.sl;
- wc.dlid_path_bits = 0;
wc.port_num = 1;
/* Signal completion event if the solicited bit is set. */
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
wqe->wr.send_flags & IB_SEND_SOLICITED);
send_comp:
+ spin_lock_irqsave(&sqp->s_lock, flags);
+flush_send:
sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
- ipath_send_complete(sqp, wqe, IB_WC_SUCCESS);
+ ipath_send_complete(sqp, wqe, send_status);
goto again;
+rnr_nak:
+ /* Handle RNR NAK */
+ if (qp->ibqp.qp_type == IB_QPT_UC)
+ goto send_comp;
+ /*
+ * Note: we don't need the s_lock held since the BUSY flag
+ * makes this single threaded.
+ */
+ if (sqp->s_rnr_retry == 0) {
+ send_status = IB_WC_RNR_RETRY_EXC_ERR;
+ goto serr;
+ }
+ if (sqp->s_rnr_retry_cnt < 7)
+ sqp->s_rnr_retry--;
+ spin_lock_irqsave(&sqp->s_lock, flags);
+ if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_RECV_OK))
+ goto clr_busy;
+ sqp->s_flags |= IPATH_S_WAITING;
+ dev->n_rnr_naks++;
+ sqp->s_rnr_timeout = ib_ipath_rnr_table[qp->r_min_rnr_timer];
+ ipath_insert_rnr_queue(sqp);
+ goto clr_busy;
+
+inv_err:
+ send_status = IB_WC_REM_INV_REQ_ERR;
+ wc.status = IB_WC_LOC_QP_OP_ERR;
+ goto err;
+
+acc_err:
+ send_status = IB_WC_REM_ACCESS_ERR;
+ wc.status = IB_WC_LOC_PROT_ERR;
+err:
+ /* responder goes to error state */
+ ipath_rc_error(qp, wc.status);
+
+serr:
+ spin_lock_irqsave(&sqp->s_lock, flags);
+ ipath_send_complete(sqp, wqe, send_status);
+ if (sqp->ibqp.qp_type == IB_QPT_RC) {
+ int lastwqe = ipath_error_qp(sqp, IB_WC_WR_FLUSH_ERR);
+
+ sqp->s_flags &= ~IPATH_S_BUSY;
+ spin_unlock_irqrestore(&sqp->s_lock, flags);
+ if (lastwqe) {
+ struct ib_event ev;
+
+ ev.device = sqp->ibqp.device;
+ ev.element.qp = &sqp->ibqp;
+ ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
+ sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context);
+ }
+ goto done;
+ }
+clr_busy:
+ sqp->s_flags &= ~IPATH_S_BUSY;
+unlock:
+ spin_unlock_irqrestore(&sqp->s_lock, flags);
done:
- if (atomic_dec_and_test(&qp->refcount))
+ if (qp && atomic_dec_and_test(&qp->refcount))
wake_up(&qp->wait);
}
-static void want_buffer(struct ipath_devdata *dd)
+static void want_buffer(struct ipath_devdata *dd, struct ipath_qp *qp)
{
- if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA)) {
+ if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA) ||
+ qp->ibqp.qp_type == IB_QPT_SMI) {
unsigned long flags;
spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
* @dev: the device we ran out of buffers on
*
* Called when we run out of PIO buffers.
+ * If we are now in the error state, return zero to flush the
+ * send work request.
*/
-static void ipath_no_bufs_available(struct ipath_qp *qp,
+static int ipath_no_bufs_available(struct ipath_qp *qp,
struct ipath_ibdev *dev)
{
unsigned long flags;
+ int ret = 1;
/*
* Note that as soon as want_buffer() is called and
* possibly before it returns, ipath_ib_piobufavail()
- * could be called. If we are still in the tasklet function,
- * tasklet_hi_schedule() will not call us until the next time
- * tasklet_hi_schedule() is called.
- * We leave the busy flag set so that another post send doesn't
- * try to put the same QP on the piowait list again.
+ * could be called. Therefore, put QP on the piowait list before
+ * enabling the PIO avail interrupt.
*/
- spin_lock_irqsave(&dev->pending_lock, flags);
- list_add_tail(&qp->piowait, &dev->piowait);
- spin_unlock_irqrestore(&dev->pending_lock, flags);
- want_buffer(dev->dd);
- dev->n_piowait++;
+ spin_lock_irqsave(&qp->s_lock, flags);
+ if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) {
+ dev->n_piowait++;
+ qp->s_flags |= IPATH_S_WAITING;
+ qp->s_flags &= ~IPATH_S_BUSY;
+ spin_lock(&dev->pending_lock);
+ if (list_empty(&qp->piowait))
+ list_add_tail(&qp->piowait, &dev->piowait);
+ spin_unlock(&dev->pending_lock);
+ } else
+ ret = 0;
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ if (ret)
+ want_buffer(dev->dd, qp);
+ return ret;
}
/**
struct ipath_qp *qp = (struct ipath_qp *)data;
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
int (*make_req)(struct ipath_qp *qp);
-
- if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy))
- goto bail;
+ unsigned long flags;
if ((qp->ibqp.qp_type == IB_QPT_RC ||
qp->ibqp.qp_type == IB_QPT_UC) &&
qp->remote_ah_attr.dlid == dev->dd->ipath_lid) {
ipath_ruc_loopback(qp);
- goto clear;
+ goto bail;
}
if (qp->ibqp.qp_type == IB_QPT_RC)
else
make_req = ipath_make_ud_req;
+ spin_lock_irqsave(&qp->s_lock, flags);
+
+ /* Return if we are already busy processing a work request. */
+ if ((qp->s_flags & (IPATH_S_BUSY | IPATH_S_ANY_WAIT)) ||
+ !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_OR_FLUSH_SEND)) {
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ goto bail;
+ }
+
+ qp->s_flags |= IPATH_S_BUSY;
+
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+
again:
/* Check for a constructed packet to be sent. */
if (qp->s_hdrwords != 0) {
*/
if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords,
qp->s_cur_sge, qp->s_cur_size)) {
- ipath_no_bufs_available(qp, dev);
- goto bail;
+ if (ipath_no_bufs_available(qp, dev))
+ goto bail;
}
dev->n_unicast_xmit++;
/* Record that we sent the packet and s_hdr is empty. */
if (make_req(qp))
goto again;
-clear:
- clear_bit(IPATH_S_BUSY, &qp->s_busy);
+
bail:;
}
+/*
+ * This should be called with s_lock held.
+ */
void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe,
enum ib_wc_status status)
{
- unsigned long flags;
- u32 last;
+ u32 old_last, last;
+
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_OR_FLUSH_SEND))
+ return;
/* See ch. 11.2.4.1 and 10.7.3.1 */
if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
status != IB_WC_SUCCESS) {
struct ib_wc wc;
+ memset(&wc, 0, sizeof wc);
wc.wr_id = wqe->wr.wr_id;
wc.status = status;
wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
- wc.vendor_err = 0;
- wc.byte_len = wqe->length;
- wc.imm_data = 0;
wc.qp = &qp->ibqp;
- wc.src_qp = 0;
- wc.wc_flags = 0;
- wc.pkey_index = 0;
- wc.slid = 0;
- wc.sl = 0;
- wc.dlid_path_bits = 0;
- wc.port_num = 0;
- ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0);
+ if (status == IB_WC_SUCCESS)
+ wc.byte_len = wqe->length;
+ ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc,
+ status != IB_WC_SUCCESS);
}
- spin_lock_irqsave(&qp->s_lock, flags);
- last = qp->s_last;
+ old_last = last = qp->s_last;
if (++last >= qp->s_size)
last = 0;
qp->s_last = last;
- spin_unlock_irqrestore(&qp->s_lock, flags);
+ if (qp->s_cur == old_last)
+ qp->s_cur = last;
+ if (qp->s_tail == old_last)
+ qp->s_tail = last;
+ if (qp->state == IB_QPS_SQD && last == qp->s_cur)
+ qp->s_draining = 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff