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Subject[PATCH 07 of 33] IB/ipath - support larger IB_QP_MAX_DEST_RD_ATOMIC and IB_QP_MAX_QP_RD_ATOMIC
Date
From
# HG changeset patch
# User Ralph Campbell <ralph.campbell@qlogic.com>
# Date 1173994464 25200
# Node ID 02b57b02578b7ffb189de66f7886214e9d5f2045
# Parent 78ae7bddbd5e205adc12993ad2956e0402ca01d7
IB/ipath - support larger IB_QP_MAX_DEST_RD_ATOMIC and IB_QP_MAX_QP_RD_ATOMIC

This patch adds support for multiple RDMA reads and atomics to be
sent before an ACK is required to be seen by the requester.

Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>

diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_qp.c
--- a/drivers/infiniband/hw/ipath/ipath_qp.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c Thu Mar 15 14:34:24 2007 -0700
@@ -320,7 +320,8 @@ static void ipath_reset_qp(struct ipath_
qp->remote_qpn = 0;
qp->qkey = 0;
qp->qp_access_flags = 0;
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
+ qp->s_busy = 0;
+ qp->s_flags &= ~IPATH_S_SIGNAL_REQ_WR;
qp->s_hdrwords = 0;
qp->s_psn = 0;
qp->r_psn = 0;
@@ -333,7 +334,6 @@ static void ipath_reset_qp(struct ipath_
qp->r_state = IB_OPCODE_UC_SEND_LAST;
}
qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
- qp->r_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
qp->r_nak_state = 0;
qp->r_wrid_valid = 0;
qp->s_rnr_timeout = 0;
@@ -344,6 +344,10 @@ static void ipath_reset_qp(struct ipath_
qp->s_ssn = 1;
qp->s_lsn = 0;
qp->s_wait_credit = 0;
+ memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
+ qp->r_head_ack_queue = 0;
+ qp->s_tail_ack_queue = 0;
+ qp->s_num_rd_atomic = 0;
if (qp->r_rq.wq) {
qp->r_rq.wq->head = 0;
qp->r_rq.wq->tail = 0;
@@ -503,6 +507,10 @@ int ipath_modify_qp(struct ib_qp *ibqp,
attr->path_mig_state != IB_MIG_REARM)
goto inval;

+ if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
+ if (attr->max_dest_rd_atomic > IPATH_MAX_RDMA_ATOMIC)
+ goto inval;
+
switch (new_state) {
case IB_QPS_RESET:
ipath_reset_qp(qp);
@@ -558,6 +566,12 @@ int ipath_modify_qp(struct ib_qp *ibqp,

if (attr_mask & IB_QP_QKEY)
qp->qkey = attr->qkey;
+
+ if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
+ qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
+
+ if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
+ qp->s_max_rd_atomic = attr->max_rd_atomic;

qp->state = new_state;
spin_unlock_irqrestore(&qp->s_lock, flags);
@@ -598,8 +612,8 @@ int ipath_query_qp(struct ib_qp *ibqp, s
attr->alt_pkey_index = 0;
attr->en_sqd_async_notify = 0;
attr->sq_draining = 0;
- attr->max_rd_atomic = 1;
- attr->max_dest_rd_atomic = 1;
+ attr->max_rd_atomic = qp->s_max_rd_atomic;
+ attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
attr->min_rnr_timer = qp->r_min_rnr_timer;
attr->port_num = 1;
attr->timeout = qp->timeout;
@@ -614,7 +628,7 @@ int ipath_query_qp(struct ib_qp *ibqp, s
init_attr->recv_cq = qp->ibqp.recv_cq;
init_attr->srq = qp->ibqp.srq;
init_attr->cap = attr->cap;
- if (qp->s_flags & (1 << IPATH_S_SIGNAL_REQ_WR))
+ if (qp->s_flags & IPATH_S_SIGNAL_REQ_WR)
init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
else
init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
@@ -786,7 +800,7 @@ struct ib_qp *ipath_create_qp(struct ib_
qp->s_size = init_attr->cap.max_send_wr + 1;
qp->s_max_sge = init_attr->cap.max_send_sge;
if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
- qp->s_flags = 1 << IPATH_S_SIGNAL_REQ_WR;
+ qp->s_flags = IPATH_S_SIGNAL_REQ_WR;
else
qp->s_flags = 0;
dev = to_idev(ibpd->device);
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_rc.c
--- a/drivers/infiniband/hw/ipath/ipath_rc.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c Thu Mar 15 14:34:24 2007 -0700
@@ -37,6 +37,19 @@
/* cut down ridiculously long IB macro names */
#define OP(x) IB_OPCODE_RC_##x

+static u32 restart_sge(struct ipath_sge_state *ss, struct ipath_swqe *wqe,
+ u32 psn, u32 pmtu)
+{
+ u32 len;
+
+ len = ((psn - wqe->psn) & IPATH_PSN_MASK) * pmtu;
+ ss->sge = wqe->sg_list[0];
+ ss->sg_list = wqe->sg_list + 1;
+ ss->num_sge = wqe->wr.num_sge;
+ ipath_skip_sge(ss, len);
+ return wqe->length - len;
+}
+
/**
* ipath_init_restart- initialize the qp->s_sge after a restart
* @qp: the QP who's SGE we're restarting
@@ -47,15 +60,9 @@ static void ipath_init_restart(struct ip
static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe)
{
struct ipath_ibdev *dev;
- u32 len;
-
- len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) *
- ib_mtu_enum_to_int(qp->path_mtu);
- qp->s_sge.sge = wqe->sg_list[0];
- qp->s_sge.sg_list = wqe->sg_list + 1;
- qp->s_sge.num_sge = wqe->wr.num_sge;
- ipath_skip_sge(&qp->s_sge, len);
- qp->s_len = wqe->length - len;
+
+ qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn,
+ ib_mtu_enum_to_int(qp->path_mtu));
dev = to_idev(qp->ibqp.device);
spin_lock(&dev->pending_lock);
if (list_empty(&qp->timerwait))
@@ -70,107 +77,123 @@ static void ipath_init_restart(struct ip
* @ohdr: a pointer to the IB header being constructed
* @pmtu: the path MTU
*
- * Return bth0 if constructed; otherwise, return 0.
+ * Return 1 if constructed; otherwise, return 0.
+ * Note that we are in the responder's side of the QP context.
* Note the QP s_lock must be held.
*/
-u32 ipath_make_rc_ack(struct ipath_qp *qp,
- struct ipath_other_headers *ohdr,
- u32 pmtu)
+static int ipath_make_rc_ack(struct ipath_qp *qp,
+ struct ipath_other_headers *ohdr,
+ u32 pmtu, u32 *bth0p, u32 *bth2p)
{
+ struct ipath_ack_entry *e;
u32 hwords;
u32 len;
u32 bth0;
+ u32 bth2;

/* header size in 32-bit words LRH+BTH = (8+12)/4. */
hwords = 5;

- /*
- * Send a response. Note that we are in the responder's
- * side of the QP context.
- */
switch (qp->s_ack_state) {
- case OP(RDMA_READ_REQUEST):
- qp->s_cur_sge = &qp->s_rdma_sge;
- len = qp->s_rdma_len;
- if (len > pmtu) {
- len = pmtu;
- qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
- } else
- qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
- qp->s_rdma_len -= len;
+ case OP(RDMA_READ_RESPONSE_LAST):
+ case OP(RDMA_READ_RESPONSE_ONLY):
+ case OP(ATOMIC_ACKNOWLEDGE):
+ qp->s_ack_state = OP(ACKNOWLEDGE);
+ /* FALLTHROUGH */
+ case OP(ACKNOWLEDGE):
+ /* Check for no next entry in the queue. */
+ if (qp->r_head_ack_queue == qp->s_tail_ack_queue) {
+ if (qp->s_flags & IPATH_S_ACK_PENDING)
+ goto normal;
+ goto bail;
+ }
+
+ e = &qp->s_ack_queue[qp->s_tail_ack_queue];
+ if (e->opcode == OP(RDMA_READ_REQUEST)) {
+ /* Copy SGE state in case we need to resend */
+ qp->s_ack_rdma_sge = e->rdma_sge;
+ qp->s_cur_sge = &qp->s_ack_rdma_sge;
+ len = e->rdma_sge.sge.sge_length;
+ if (len > pmtu) {
+ len = pmtu;
+ qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
+ } else {
+ qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
+ if (++qp->s_tail_ack_queue >
+ IPATH_MAX_RDMA_ATOMIC)
+ qp->s_tail_ack_queue = 0;
+ }
+ ohdr->u.aeth = ipath_compute_aeth(qp);
+ hwords++;
+ qp->s_ack_rdma_psn = e->psn;
+ bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK;
+ } else {
+ /* COMPARE_SWAP or FETCH_ADD */
+ qp->s_cur_sge = NULL;
+ len = 0;
+ qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
+ ohdr->u.at.aeth = ipath_compute_aeth(qp);
+ ohdr->u.at.atomic_ack_eth[0] =
+ cpu_to_be32(e->atomic_data >> 32);
+ ohdr->u.at.atomic_ack_eth[1] =
+ cpu_to_be32(e->atomic_data);
+ hwords += sizeof(ohdr->u.at) / sizeof(u32);
+ bth2 = e->psn;
+ if (++qp->s_tail_ack_queue > IPATH_MAX_RDMA_ATOMIC)
+ qp->s_tail_ack_queue = 0;
+ }
bth0 = qp->s_ack_state << 24;
- ohdr->u.aeth = ipath_compute_aeth(qp);
- hwords++;
break;

case OP(RDMA_READ_RESPONSE_FIRST):
qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
/* FALLTHROUGH */
case OP(RDMA_READ_RESPONSE_MIDDLE):
- qp->s_cur_sge = &qp->s_rdma_sge;
- len = qp->s_rdma_len;
+ len = qp->s_ack_rdma_sge.sge.sge_length;
if (len > pmtu)
len = pmtu;
else {
ohdr->u.aeth = ipath_compute_aeth(qp);
hwords++;
qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
- }
- qp->s_rdma_len -= len;
+ if (++qp->s_tail_ack_queue > IPATH_MAX_RDMA_ATOMIC)
+ qp->s_tail_ack_queue = 0;
+ }
bth0 = qp->s_ack_state << 24;
+ bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK;
break;

- case OP(RDMA_READ_RESPONSE_LAST):
- case OP(RDMA_READ_RESPONSE_ONLY):
- /*
- * We have to prevent new requests from changing
- * the r_sge state while a ipath_verbs_send()
- * is in progress.
- */
- qp->s_ack_state = OP(ACKNOWLEDGE);
- bth0 = 0;
- goto bail;
-
- case OP(COMPARE_SWAP):
- case OP(FETCH_ADD):
+ default:
+ normal:
+ /*
+ * Send a regular ACK.
+ * Set the s_ack_state so we wait until after sending
+ * the ACK before setting s_ack_state to ACKNOWLEDGE
+ * (see above).
+ */
+ qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
+ qp->s_flags &= ~IPATH_S_ACK_PENDING;
qp->s_cur_sge = NULL;
- len = 0;
- /*
- * Set the s_ack_state so the receive interrupt handler
- * won't try to send an ACK (out of order) until this one
- * is actually sent.
- */
- qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
- bth0 = OP(ATOMIC_ACKNOWLEDGE) << 24;
- ohdr->u.at.aeth = ipath_compute_aeth(qp);
- ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->r_atomic_data);
- hwords += sizeof(ohdr->u.at) / 4;
- break;
-
- default:
- /* Send a regular ACK. */
- qp->s_cur_sge = NULL;
- len = 0;
- /*
- * Set the s_ack_state so the receive interrupt handler
- * won't try to send an ACK (out of order) until this one
- * is actually sent.
- */
- qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
- bth0 = OP(ACKNOWLEDGE) << 24;
if (qp->s_nak_state)
- ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) |
- (qp->s_nak_state <<
- IPATH_AETH_CREDIT_SHIFT));
+ ohdr->u.aeth =
+ cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) |
+ (qp->s_nak_state <<
+ IPATH_AETH_CREDIT_SHIFT));
else
ohdr->u.aeth = ipath_compute_aeth(qp);
hwords++;
+ len = 0;
+ bth0 = OP(ACKNOWLEDGE) << 24;
+ bth2 = qp->s_ack_psn & IPATH_PSN_MASK;
}
qp->s_hdrwords = hwords;
qp->s_cur_size = len;
+ *bth0p = bth0;
+ *bth2p = bth2;
+ return 1;

bail:
- return bth0;
+ return 0;
}

/**
@@ -197,9 +220,16 @@ int ipath_make_rc_req(struct ipath_qp *q
u32 bth2;
char newreq;

+ /* Sending responses has higher priority over sending requests. */
+ if ((qp->r_head_ack_queue != qp->s_tail_ack_queue ||
+ (qp->s_flags & IPATH_S_ACK_PENDING) ||
+ qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE) &&
+ ipath_make_rc_ack(qp, ohdr, pmtu, bth0p, bth2p))
+ goto done;
+
if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) ||
qp->s_rnr_timeout)
- goto done;
+ goto bail;

/* Limit the number of packets sent without an ACK. */
if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT) > 0) {
@@ -210,7 +240,7 @@ int ipath_make_rc_req(struct ipath_qp *q
list_add_tail(&qp->timerwait,
&dev->pending[dev->pending_index]);
spin_unlock(&dev->pending_lock);
- goto done;
+ goto bail;
}

/* header size in 32-bit words LRH+BTH = (8+12)/4. */
@@ -232,7 +262,16 @@ int ipath_make_rc_req(struct ipath_qp *q
if (qp->s_cur == qp->s_tail) {
/* Check if send work queue is empty. */
if (qp->s_tail == qp->s_head)
- goto done;
+ goto bail;
+ /*
+ * If a fence is requested, wait for previous
+ * RDMA read and atomic operations to finish.
+ */
+ if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
+ qp->s_num_rd_atomic) {
+ qp->s_flags |= IPATH_S_FENCE_PENDING;
+ goto bail;
+ }
wqe->psn = qp->s_next_psn;
newreq = 1;
}
@@ -250,7 +289,7 @@ int ipath_make_rc_req(struct ipath_qp *q
/* If no credit, return. */
if (qp->s_lsn != (u32) -1 &&
ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
- goto done;
+ goto bail;
wqe->lpsn = wqe->psn;
if (len > pmtu) {
wqe->lpsn += (len - 1) / pmtu;
@@ -281,13 +320,13 @@ int ipath_make_rc_req(struct ipath_qp *q
/* If no credit, return. */
if (qp->s_lsn != (u32) -1 &&
ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
- goto done;
+ goto bail;
ohdr->u.rc.reth.vaddr =
cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
ohdr->u.rc.reth.rkey =
cpu_to_be32(wqe->wr.wr.rdma.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(len);
- hwords += sizeof(struct ib_reth) / 4;
+ hwords += sizeof(struct ib_reth) / sizeof(u32);
wqe->lpsn = wqe->psn;
if (len > pmtu) {
wqe->lpsn += (len - 1) / pmtu;
@@ -312,14 +351,17 @@ int ipath_make_rc_req(struct ipath_qp *q
break;

case IB_WR_RDMA_READ:
- ohdr->u.rc.reth.vaddr =
- cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
- ohdr->u.rc.reth.rkey =
- cpu_to_be32(wqe->wr.wr.rdma.rkey);
- ohdr->u.rc.reth.length = cpu_to_be32(len);
- qp->s_state = OP(RDMA_READ_REQUEST);
- hwords += sizeof(ohdr->u.rc.reth) / 4;
+ /*
+ * Don't allow more operations to be started
+ * than the QP limits allow.
+ */
if (newreq) {
+ if (qp->s_num_rd_atomic >=
+ qp->s_max_rd_atomic) {
+ qp->s_flags |= IPATH_S_RDMAR_PENDING;
+ goto bail;
+ }
+ qp->s_num_rd_atomic++;
if (qp->s_lsn != (u32) -1)
qp->s_lsn++;
/*
@@ -330,6 +372,13 @@ int ipath_make_rc_req(struct ipath_qp *q
qp->s_next_psn += (len - 1) / pmtu;
wqe->lpsn = qp->s_next_psn++;
}
+ ohdr->u.rc.reth.vaddr =
+ cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
+ ohdr->u.rc.reth.rkey =
+ cpu_to_be32(wqe->wr.wr.rdma.rkey);
+ ohdr->u.rc.reth.length = cpu_to_be32(len);
+ qp->s_state = OP(RDMA_READ_REQUEST);
+ hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
ss = NULL;
len = 0;
if (++qp->s_cur == qp->s_size)
@@ -338,32 +387,48 @@ int ipath_make_rc_req(struct ipath_qp *q

case IB_WR_ATOMIC_CMP_AND_SWP:
case IB_WR_ATOMIC_FETCH_AND_ADD:
- if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP)
- qp->s_state = OP(COMPARE_SWAP);
- else
- qp->s_state = OP(FETCH_ADD);
- ohdr->u.atomic_eth.vaddr = cpu_to_be64(
- wqe->wr.wr.atomic.remote_addr);
- ohdr->u.atomic_eth.rkey = cpu_to_be32(
- wqe->wr.wr.atomic.rkey);
- ohdr->u.atomic_eth.swap_data = cpu_to_be64(
- wqe->wr.wr.atomic.swap);
- ohdr->u.atomic_eth.compare_data = cpu_to_be64(
- wqe->wr.wr.atomic.compare_add);
- hwords += sizeof(struct ib_atomic_eth) / 4;
+ /*
+ * Don't allow more operations to be started
+ * than the QP limits allow.
+ */
if (newreq) {
+ if (qp->s_num_rd_atomic >=
+ qp->s_max_rd_atomic) {
+ qp->s_flags |= IPATH_S_RDMAR_PENDING;
+ goto bail;
+ }
+ qp->s_num_rd_atomic++;
if (qp->s_lsn != (u32) -1)
qp->s_lsn++;
wqe->lpsn = wqe->psn;
}
+ if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
+ qp->s_state = OP(COMPARE_SWAP);
+ ohdr->u.atomic_eth.swap_data = cpu_to_be64(
+ wqe->wr.wr.atomic.swap);
+ ohdr->u.atomic_eth.compare_data = cpu_to_be64(
+ wqe->wr.wr.atomic.compare_add);
+ } else {
+ qp->s_state = OP(FETCH_ADD);
+ ohdr->u.atomic_eth.swap_data = cpu_to_be64(
+ wqe->wr.wr.atomic.compare_add);
+ ohdr->u.atomic_eth.compare_data = 0;
+ }
+ ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32(
+ wqe->wr.wr.atomic.remote_addr >> 32);
+ ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32(
+ wqe->wr.wr.atomic.remote_addr);
+ ohdr->u.atomic_eth.rkey = cpu_to_be32(
+ wqe->wr.wr.atomic.rkey);
+ hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
+ ss = NULL;
+ len = 0;
if (++qp->s_cur == qp->s_size)
qp->s_cur = 0;
- ss = NULL;
- len = 0;
break;

default:
- goto done;
+ goto bail;
}
qp->s_sge.sge = wqe->sg_list[0];
qp->s_sge.sg_list = wqe->sg_list + 1;
@@ -479,7 +544,7 @@ int ipath_make_rc_req(struct ipath_qp *q
cpu_to_be32(wqe->wr.wr.rdma.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len);
qp->s_state = OP(RDMA_READ_REQUEST);
- hwords += sizeof(ohdr->u.rc.reth) / 4;
+ hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
bth2 = qp->s_psn++ & IPATH_PSN_MASK;
if ((int)(qp->s_psn - qp->s_next_psn) > 0)
qp->s_next_psn = qp->s_psn;
@@ -489,20 +554,6 @@ int ipath_make_rc_req(struct ipath_qp *q
if (qp->s_cur == qp->s_size)
qp->s_cur = 0;
break;
-
- case OP(RDMA_READ_REQUEST):
- case OP(COMPARE_SWAP):
- case OP(FETCH_ADD):
- /*
- * We shouldn't start anything new until this request is
- * finished. The ACK will handle rescheduling us. XXX The
- * number of outstanding ones is negotiated at connection
- * setup time (see pg. 258,289)? XXX Also, if we support
- * multiple outstanding requests, we need to check the WQE
- * IB_SEND_FENCE flag and not send a new request if a RDMA
- * read or atomic is pending.
- */
- goto done;
}
if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT - 1) >= 0)
bth2 |= 1 << 31; /* Request ACK. */
@@ -512,9 +563,10 @@ int ipath_make_rc_req(struct ipath_qp *q
qp->s_cur_size = len;
*bth0p = bth0 | (qp->s_state << 24);
*bth2p = bth2;
+done:
return 1;

-done:
+bail:
return 0;
}

@@ -524,7 +576,8 @@ done:
*
* This is called from ipath_rc_rcv() and only uses the receive
* side QP state.
- * Note that RDMA reads are handled in the send side QP state and tasklet.
+ * Note that RDMA reads and atomics are handled in the
+ * send side QP state and tasklet.
*/
static void send_rc_ack(struct ipath_qp *qp)
{
@@ -534,6 +587,10 @@ static void send_rc_ack(struct ipath_qp
u32 hwords;
struct ipath_ib_header hdr;
struct ipath_other_headers *ohdr;
+
+ /* Don't send ACK or NAK if a RDMA read or atomic is pending. */
+ if (qp->r_head_ack_queue != qp->s_tail_ack_queue)
+ goto queue_ack;

/* Construct the header. */
ohdr = &hdr.u.oth;
@@ -548,19 +605,14 @@ static void send_rc_ack(struct ipath_qp
lrh0 = IPATH_LRH_GRH;
}
/* read pkey_index w/o lock (its atomic) */
- bth0 = ipath_get_pkey(dev->dd, qp->s_pkey_index);
+ bth0 = ipath_get_pkey(dev->dd, qp->s_pkey_index) |
+ OP(ACKNOWLEDGE) << 24;
if (qp->r_nak_state)
ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) |
(qp->r_nak_state <<
IPATH_AETH_CREDIT_SHIFT));
else
ohdr->u.aeth = ipath_compute_aeth(qp);
- if (qp->r_ack_state >= OP(COMPARE_SWAP)) {
- bth0 |= OP(ATOMIC_ACKNOWLEDGE) << 24;
- ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->r_atomic_data);
- hwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4;
- } else
- bth0 |= OP(ACKNOWLEDGE) << 24;
lrh0 |= qp->remote_ah_attr.sl << 4;
hdr.lrh[0] = cpu_to_be16(lrh0);
hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
@@ -574,31 +626,31 @@ static void send_rc_ack(struct ipath_qp
* If we can send the ACK, clear the ACK state.
*/
if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) {
- qp->r_ack_state = OP(ACKNOWLEDGE);
dev->n_unicast_xmit++;
- } else {
- /*
- * We are out of PIO buffers at the moment.
- * Pass responsibility for sending the ACK to the
- * send tasklet so that when a PIO buffer becomes
- * available, the ACK is sent ahead of other outgoing
- * packets.
- */
- dev->n_rc_qacks++;
- spin_lock_irq(&qp->s_lock);
- /* Don't coalesce if a RDMA read or atomic is pending. */
- if (qp->s_ack_state == OP(ACKNOWLEDGE) ||
- qp->s_ack_state < OP(RDMA_READ_REQUEST)) {
- qp->s_ack_state = qp->r_ack_state;
- qp->s_nak_state = qp->r_nak_state;
- qp->s_ack_psn = qp->r_ack_psn;
- qp->r_ack_state = OP(ACKNOWLEDGE);
- }
- spin_unlock_irq(&qp->s_lock);
-
- /* Call ipath_do_rc_send() in another thread. */
- tasklet_hi_schedule(&qp->s_task);
- }
+ goto done;
+ }
+
+ /*
+ * We are out of PIO buffers at the moment.
+ * Pass responsibility for sending the ACK to the
+ * send tasklet so that when a PIO buffer becomes
+ * available, the ACK is sent ahead of other outgoing
+ * packets.
+ */
+ dev->n_rc_qacks++;
+
+queue_ack:
+ spin_lock_irq(&qp->s_lock);
+ qp->s_flags |= IPATH_S_ACK_PENDING;
+ qp->s_nak_state = qp->r_nak_state;
+ qp->s_ack_psn = qp->r_ack_psn;
+ spin_unlock_irq(&qp->s_lock);
+
+ /* Call ipath_do_rc_send() in another thread. */
+ tasklet_hi_schedule(&qp->s_task);
+
+done:
+ return;
}

/**
@@ -775,10 +827,6 @@ static int do_rc_ack(struct ipath_qp *qp
list_del_init(&qp->timerwait);
spin_unlock(&dev->pending_lock);

- /* Nothing is pending to ACK/NAK. */
- if (unlikely(qp->s_last == qp->s_tail))
- goto bail;
-
/*
* Note that NAKs implicitly ACK outstanding SEND and RDMA write
* requests and implicitly NAK RDMA read and atomic requests issued
@@ -806,7 +854,7 @@ static int do_rc_ack(struct ipath_qp *qp
*/
if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
(opcode != OP(RDMA_READ_RESPONSE_LAST) ||
- ipath_cmp24(ack_psn, wqe->lpsn) != 0)) ||
+ ipath_cmp24(ack_psn, wqe->lpsn) != 0)) ||
((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
(opcode != OP(ATOMIC_ACKNOWLEDGE) ||
@@ -824,12 +872,23 @@ static int do_rc_ack(struct ipath_qp *qp
*/
goto bail;
}
- if (wqe->wr.opcode == IB_WR_RDMA_READ ||
- wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
- wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
- tasklet_hi_schedule(&qp->s_task);
+ if (qp->s_num_rd_atomic &&
+ (wqe->wr.opcode == IB_WR_RDMA_READ ||
+ wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
+ wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) {
+ qp->s_num_rd_atomic--;
+ /* Restart sending task if fence is complete */
+ if ((qp->s_flags & IPATH_S_FENCE_PENDING) &&
+ !qp->s_num_rd_atomic) {
+ qp->s_flags &= ~IPATH_S_FENCE_PENDING;
+ tasklet_hi_schedule(&qp->s_task);
+ } else if (qp->s_flags & IPATH_S_RDMAR_PENDING) {
+ qp->s_flags &= ~IPATH_S_RDMAR_PENDING;
+ tasklet_hi_schedule(&qp->s_task);
+ }
+ }
/* Post a send completion queue entry if requested. */
- if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
+ if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
wc.wr_id = wqe->wr.wr_id;
wc.status = IB_WC_SUCCESS;
@@ -1003,6 +1062,7 @@ static inline void ipath_rc_rcv_resp(str
u32 psn, u32 hdrsize, u32 pmtu,
int header_in_data)
{
+ struct ipath_swqe *wqe;
unsigned long flags;
struct ib_wc wc;
int diff;
@@ -1032,6 +1092,10 @@ static inline void ipath_rc_rcv_resp(str
goto ack_done;
}

+ if (unlikely(qp->s_last == qp->s_tail))
+ goto ack_done;
+ wqe = get_swqe_ptr(qp, qp->s_last);
+
switch (opcode) {
case OP(ACKNOWLEDGE):
case OP(ATOMIC_ACKNOWLEDGE):
@@ -1042,38 +1106,49 @@ static inline void ipath_rc_rcv_resp(str
aeth = be32_to_cpu(((__be32 *) data)[0]);
data += sizeof(__be32);
}
- if (opcode == OP(ATOMIC_ACKNOWLEDGE))
- *(u64 *) qp->s_sge.sge.vaddr = *(u64 *) data;
+ if (opcode == OP(ATOMIC_ACKNOWLEDGE)) {
+ u64 val;
+
+ if (!header_in_data) {
+ __be32 *p = ohdr->u.at.atomic_ack_eth;
+
+ val = ((u64) be32_to_cpu(p[0]) << 32) |
+ be32_to_cpu(p[1]);
+ } else
+ val = be64_to_cpu(((__be64 *) data)[0]);
+ *(u64 *) wqe->sg_list[0].vaddr = val;
+ }
if (!do_rc_ack(qp, aeth, psn, opcode) ||
opcode != OP(RDMA_READ_RESPONSE_FIRST))
goto ack_done;
hdrsize += 4;
- /*
- * do_rc_ack() has already checked the PSN so skip
- * the sequence check.
- */
- goto rdma_read;
+ if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
+ goto ack_done;
+ /*
+ * If this is a response to a resent RDMA read, we
+ * have to be careful to copy the data to the right
+ * location.
+ */
+ qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
+ wqe, psn, pmtu);
+ goto read_middle;

case OP(RDMA_READ_RESPONSE_MIDDLE):
/* no AETH, no ACK */
if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) {
dev->n_rdma_seq++;
- if (qp->s_last != qp->s_tail)
- ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
+ ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
goto ack_done;
}
- rdma_read:
- if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST)))
+ if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
goto ack_done;
+ read_middle:
if (unlikely(tlen != (hdrsize + pmtu + 4)))
goto ack_done;
- if (unlikely(pmtu >= qp->s_len))
+ if (unlikely(pmtu >= qp->s_rdma_read_len))
goto ack_done;
+
/* We got a response so update the timeout. */
- if (unlikely(qp->s_last == qp->s_tail ||
- get_swqe_ptr(qp, qp->s_last)->wr.opcode !=
- IB_WR_RDMA_READ))
- goto ack_done;
spin_lock(&dev->pending_lock);
if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait))
list_move_tail(&qp->timerwait,
@@ -1082,27 +1157,41 @@ static inline void ipath_rc_rcv_resp(str
/*
* Update the RDMA receive state but do the copy w/o
* holding the locks and blocking interrupts.
- * XXX Yet another place that affects relaxed RDMA order
- * since we don't want s_sge modified.
- */
- qp->s_len -= pmtu;
+ */
+ qp->s_rdma_read_len -= pmtu;
update_last_psn(qp, psn);
spin_unlock_irqrestore(&qp->s_lock, flags);
- ipath_copy_sge(&qp->s_sge, data, pmtu);
+ ipath_copy_sge(&qp->s_rdma_read_sge, data, pmtu);
goto bail;
+
+ case OP(RDMA_READ_RESPONSE_ONLY):
+ if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) {
+ dev->n_rdma_seq++;
+ ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
+ goto ack_done;
+ }
+ if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
+ goto ack_done;
+ /*
+ * If this is a response to a resent RDMA read, we
+ * have to be careful to copy the data to the right
+ * location.
+ * XXX should check PSN and wqe opcode first.
+ */
+ qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge,
+ wqe, psn, pmtu);
+ goto read_last;

case OP(RDMA_READ_RESPONSE_LAST):
/* ACKs READ req. */
if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) {
dev->n_rdma_seq++;
- if (qp->s_last != qp->s_tail)
- ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
+ ipath_restart_rc(qp, qp->s_last_psn + 1, &wc);
goto ack_done;
}
- /* FALLTHROUGH */
- case OP(RDMA_READ_RESPONSE_ONLY):
- if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST)))
+ if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ))
goto ack_done;
+ read_last:
/*
* Get the number of bytes the message was padded by.
*/
@@ -1117,7 +1206,7 @@ static inline void ipath_rc_rcv_resp(str
goto ack_done;
}
tlen -= hdrsize + pad + 8;
- if (unlikely(tlen != qp->s_len)) {
+ if (unlikely(tlen != qp->s_rdma_read_len)) {
/* XXX Need to generate an error CQ entry. */
goto ack_done;
}
@@ -1127,17 +1216,8 @@ static inline void ipath_rc_rcv_resp(str
aeth = be32_to_cpu(((__be32 *) data)[0]);
data += sizeof(__be32);
}
- ipath_copy_sge(&qp->s_sge, data, tlen);
- if (do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST))) {
- /*
- * Change the state so we contimue
- * processing new requests and wake up the
- * tasklet if there are posted sends.
- */
- qp->s_state = OP(SEND_LAST);
- if (qp->s_tail != qp->s_head)
- tasklet_hi_schedule(&qp->s_task);
- }
+ ipath_copy_sge(&qp->s_rdma_read_sge, data, tlen);
+ (void) do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST));
goto ack_done;
}

@@ -1162,7 +1242,7 @@ bail:
* incoming RC packet for the given QP.
* Called at interrupt level.
* Return 1 if no more processing is needed; otherwise return 0 to
- * schedule a response to be sent and the s_lock unlocked.
+ * schedule a response to be sent.
*/
static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
struct ipath_other_headers *ohdr,
@@ -1173,25 +1253,23 @@ static inline int ipath_rc_rcv_error(str
int diff,
int header_in_data)
{
- struct ib_reth *reth;
+ struct ipath_ack_entry *e;
+ u8 i, prev;
+ int old_req;

if (diff > 0) {
/*
* Packet sequence error.
* A NAK will ACK earlier sends and RDMA writes.
- * Don't queue the NAK if a RDMA read, atomic, or
- * NAK is pending though.
- */
- if (qp->s_ack_state != OP(ACKNOWLEDGE) ||
- qp->r_nak_state != 0)
- goto done;
- if (qp->r_ack_state < OP(COMPARE_SWAP)) {
- qp->r_ack_state = OP(SEND_ONLY);
+ * Don't queue the NAK if we already sent one.
+ */
+ if (!qp->r_nak_state) {
qp->r_nak_state = IB_NAK_PSN_ERROR;
/* Use the expected PSN. */
qp->r_ack_psn = qp->r_psn;
- }
- goto send_ack;
+ goto send_ack;
+ }
+ goto done;
}

/*
@@ -1204,8 +1282,46 @@ static inline int ipath_rc_rcv_error(str
* can coalesce an outstanding duplicate ACK. We have to
* send the earliest so that RDMA reads can be restarted at
* the requester's expected PSN.
+ *
+ * First, find where this duplicate PSN falls within the
+ * ACKs previously sent.
*/
- if (opcode == OP(RDMA_READ_REQUEST)) {
+ psn &= IPATH_PSN_MASK;
+ e = NULL;
+ old_req = 1;
+ spin_lock_irq(&qp->s_lock);
+ for (i = qp->r_head_ack_queue; ; i = prev) {
+ if (i == qp->s_tail_ack_queue)
+ old_req = 0;
+ if (i)
+ prev = i - 1;
+ else
+ prev = IPATH_MAX_RDMA_ATOMIC;
+ if (prev == qp->r_head_ack_queue) {
+ e = NULL;
+ break;
+ }
+ e = &qp->s_ack_queue[prev];
+ if (!e->opcode) {
+ e = NULL;
+ break;
+ }
+ if (ipath_cmp24(psn, e->psn) >= 0)
+ break;
+ }
+ switch (opcode) {
+ case OP(RDMA_READ_REQUEST): {
+ struct ib_reth *reth;
+ u32 offset;
+ u32 len;
+
+ /*
+ * If we didn't find the RDMA read request in the ack queue,
+ * or the send tasklet is already backed up to send an
+ * earlier entry, we can ignore this request.
+ */
+ if (!e || e->opcode != OP(RDMA_READ_REQUEST) || old_req)
+ goto unlock_done;
/* RETH comes after BTH */
if (!header_in_data)
reth = &ohdr->u.rc.reth;
@@ -1214,88 +1330,87 @@ static inline int ipath_rc_rcv_error(str
data += sizeof(*reth);
}
/*
- * If we receive a duplicate RDMA request, it means the
- * requester saw a sequence error and needs to restart
- * from an earlier point. We can abort the current
- * RDMA read send in that case.
- */
- spin_lock_irq(&qp->s_lock);
- if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
- (qp->s_hdrwords || ipath_cmp24(psn, qp->s_ack_psn) >= 0)) {
- /*
- * We are already sending earlier requested data.
- * Don't abort it to send later out of sequence data.
- */
- spin_unlock_irq(&qp->s_lock);
- goto done;
- }
- qp->s_rdma_len = be32_to_cpu(reth->length);
- if (qp->s_rdma_len != 0) {
+ * Address range must be a subset of the original
+ * request and start on pmtu boundaries.
+ * We reuse the old ack_queue slot since the requester
+ * should not back up and request an earlier PSN for the
+ * same request.
+ */
+ offset = ((psn - e->psn) & IPATH_PSN_MASK) *
+ ib_mtu_enum_to_int(qp->path_mtu);
+ len = be32_to_cpu(reth->length);
+ if (unlikely(offset + len > e->rdma_sge.sge.sge_length))
+ goto unlock_done;
+ if (len != 0) {
u32 rkey = be32_to_cpu(reth->rkey);
u64 vaddr = be64_to_cpu(reth->vaddr);
int ok;

- /*
- * Address range must be a subset of the original
- * request and start on pmtu boundaries.
- */
- ok = ipath_rkey_ok(qp, &qp->s_rdma_sge,
- qp->s_rdma_len, vaddr, rkey,
+ ok = ipath_rkey_ok(qp, &e->rdma_sge,
+ len, vaddr, rkey,
IB_ACCESS_REMOTE_READ);
- if (unlikely(!ok)) {
- spin_unlock_irq(&qp->s_lock);
- goto done;
- }
+ if (unlikely(!ok))
+ goto unlock_done;
} else {
- qp->s_rdma_sge.sg_list = NULL;
- qp->s_rdma_sge.num_sge = 0;
- qp->s_rdma_sge.sge.mr = NULL;
- qp->s_rdma_sge.sge.vaddr = NULL;
- qp->s_rdma_sge.sge.length = 0;
- qp->s_rdma_sge.sge.sge_length = 0;
- }
- qp->s_ack_state = opcode;
- qp->s_ack_psn = psn;
- spin_unlock_irq(&qp->s_lock);
- tasklet_hi_schedule(&qp->s_task);
- goto send_ack;
- }
-
- /*
- * A pending RDMA read will ACK anything before it so
- * ignore earlier duplicate requests.
- */
- if (qp->s_ack_state != OP(ACKNOWLEDGE))
- goto done;
-
- /*
- * If an ACK is pending, don't replace the pending ACK
- * with an earlier one since the later one will ACK the earlier.
- * Also, if we already have a pending atomic, send it.
- */
- if (qp->r_ack_state != OP(ACKNOWLEDGE) &&
- (ipath_cmp24(psn, qp->r_ack_psn) <= 0 ||
- qp->r_ack_state >= OP(COMPARE_SWAP)))
- goto send_ack;
- switch (opcode) {
+ e->rdma_sge.sg_list = NULL;
+ e->rdma_sge.num_sge = 0;
+ e->rdma_sge.sge.mr = NULL;
+ e->rdma_sge.sge.vaddr = NULL;
+ e->rdma_sge.sge.length = 0;
+ e->rdma_sge.sge.sge_length = 0;
+ }
+ e->psn = psn;
+ qp->s_ack_state = OP(ACKNOWLEDGE);
+ qp->s_tail_ack_queue = prev;
+ break;
+ }
+
case OP(COMPARE_SWAP):
- case OP(FETCH_ADD):
- /*
- * Check for the PSN of the last atomic operation
- * performed and resend the result if found.
- */
- if ((psn & IPATH_PSN_MASK) != qp->r_atomic_psn)
- goto done;
+ case OP(FETCH_ADD): {
+ /*
+ * If we didn't find the atomic request in the ack queue
+ * or the send tasklet is already backed up to send an
+ * earlier entry, we can ignore this request.
+ */
+ if (!e || e->opcode != (u8) opcode || old_req)
+ goto unlock_done;
+ qp->s_ack_state = OP(ACKNOWLEDGE);
+ qp->s_tail_ack_queue = prev;
break;
}
- qp->r_ack_state = opcode;
+
+ default:
+ if (old_req)
+ goto unlock_done;
+ /*
+ * Resend the most recent ACK if this request is
+ * after all the previous RDMA reads and atomics.
+ */
+ if (i == qp->r_head_ack_queue) {
+ spin_unlock_irq(&qp->s_lock);
+ qp->r_nak_state = 0;
+ qp->r_ack_psn = qp->r_psn - 1;
+ goto send_ack;
+ }
+ /*
+ * Resend the RDMA read or atomic op which
+ * ACKs this duplicate request.
+ */
+ qp->s_ack_state = OP(ACKNOWLEDGE);
+ qp->s_tail_ack_queue = i;
+ break;
+ }
qp->r_nak_state = 0;
- qp->r_ack_psn = psn;
+ spin_unlock_irq(&qp->s_lock);
+ tasklet_hi_schedule(&qp->s_task);
+
+unlock_done:
+ spin_unlock_irq(&qp->s_lock);
+done:
+ return 1;
+
send_ack:
return 0;
-
-done:
- return 1;
}

static void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err)
@@ -1391,15 +1506,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
opcode == OP(SEND_LAST_WITH_IMMEDIATE))
break;
nack_inv:
- /*
- * A NAK will ACK earlier sends and RDMA writes.
- * Don't queue the NAK if a RDMA read, atomic, or NAK
- * is pending though.
- */
- if (qp->r_ack_state >= OP(COMPARE_SWAP))
- goto send_ack;
ipath_rc_error(qp, IB_WC_REM_INV_REQ_ERR);
- qp->r_ack_state = OP(SEND_ONLY);
qp->r_nak_state = IB_NAK_INVALID_REQUEST;
qp->r_ack_psn = qp->r_psn;
goto send_ack;
@@ -1441,9 +1548,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de
* Don't queue the NAK if a RDMA read or atomic
* is pending though.
*/
- if (qp->r_ack_state >= OP(COMPARE_SWAP))
- goto send_ack;
- qp->r_ack_state = OP(SEND_ONLY);
+ if (qp->r_nak_state)
+ goto done;
qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer;
qp->r_ack_psn = qp->r_psn;
goto send_ack;
@@ -1567,7 +1673,19 @@ void ipath_rc_rcv(struct ipath_ibdev *de
goto rnr_nak;
goto send_last_imm;

- case OP(RDMA_READ_REQUEST):
+ case OP(RDMA_READ_REQUEST): {
+ struct ipath_ack_entry *e;
+ u32 len;
+ u8 next;
+
+ if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
+ goto nack_acc;
+ next = qp->r_head_ack_queue + 1;
+ if (next > IPATH_MAX_RDMA_ATOMIC)
+ next = 0;
+ if (unlikely(next == qp->s_tail_ack_queue))
+ goto nack_inv;
+ e = &qp->s_ack_queue[qp->r_head_ack_queue];
/* RETH comes after BTH */
if (!header_in_data)
reth = &ohdr->u.rc.reth;
@@ -1575,72 +1693,75 @@ void ipath_rc_rcv(struct ipath_ibdev *de
reth = (struct ib_reth *)data;
data += sizeof(*reth);
}
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_READ)))
- goto nack_acc;
- spin_lock_irq(&qp->s_lock);
- qp->s_rdma_len = be32_to_cpu(reth->length);
- if (qp->s_rdma_len != 0) {
+ len = be32_to_cpu(reth->length);
+ if (len) {
u32 rkey = be32_to_cpu(reth->rkey);
u64 vaddr = be64_to_cpu(reth->vaddr);
int ok;

/* Check rkey & NAK */
- ok = ipath_rkey_ok(qp, &qp->s_rdma_sge,
- qp->s_rdma_len, vaddr, rkey,
- IB_ACCESS_REMOTE_READ);
- if (unlikely(!ok)) {
- spin_unlock_irq(&qp->s_lock);
+ ok = ipath_rkey_ok(qp, &e->rdma_sge, len, vaddr,
+ rkey, IB_ACCESS_REMOTE_READ);
+ if (unlikely(!ok))
goto nack_acc;
- }
/*
* Update the next expected PSN. We add 1 later
* below, so only add the remainder here.
*/
- if (qp->s_rdma_len > pmtu)
- qp->r_psn += (qp->s_rdma_len - 1) / pmtu;
+ if (len > pmtu)
+ qp->r_psn += (len - 1) / pmtu;
} else {
- qp->s_rdma_sge.sg_list = NULL;
- qp->s_rdma_sge.num_sge = 0;
- qp->s_rdma_sge.sge.mr = NULL;
- qp->s_rdma_sge.sge.vaddr = NULL;
- qp->s_rdma_sge.sge.length = 0;
- qp->s_rdma_sge.sge.sge_length = 0;
- }
+ e->rdma_sge.sg_list = NULL;
+ e->rdma_sge.num_sge = 0;
+ e->rdma_sge.sge.mr = NULL;
+ e->rdma_sge.sge.vaddr = NULL;
+ e->rdma_sge.sge.length = 0;
+ e->rdma_sge.sge.sge_length = 0;
+ }
+ e->opcode = opcode;
+ e->psn = psn;
/*
* We need to increment the MSN here instead of when we
* finish sending the result since a duplicate request would
* increment it more than once.
*/
qp->r_msn++;
-
- qp->s_ack_state = opcode;
- qp->s_ack_psn = psn;
- spin_unlock_irq(&qp->s_lock);
-
qp->r_psn++;
qp->r_state = opcode;
qp->r_nak_state = 0;
+ barrier();
+ qp->r_head_ack_queue = next;

/* Call ipath_do_rc_send() in another thread. */
tasklet_hi_schedule(&qp->s_task);

goto done;
+ }

case OP(COMPARE_SWAP):
case OP(FETCH_ADD): {
struct ib_atomic_eth *ateth;
+ struct ipath_ack_entry *e;
u64 vaddr;
+ atomic64_t *maddr;
u64 sdata;
u32 rkey;
-
+ u8 next;
+
+ if (unlikely(!(qp->qp_access_flags &
+ IB_ACCESS_REMOTE_ATOMIC)))
+ goto nack_acc;
+ next = qp->r_head_ack_queue + 1;
+ if (next > IPATH_MAX_RDMA_ATOMIC)
+ next = 0;
+ if (unlikely(next == qp->s_tail_ack_queue))
+ goto nack_inv;
if (!header_in_data)
ateth = &ohdr->u.atomic_eth;
- else {
+ else
ateth = (struct ib_atomic_eth *)data;
- data += sizeof(*ateth);
- }
- vaddr = be64_to_cpu(ateth->vaddr);
+ vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) |
+ be32_to_cpu(ateth->vaddr[1]);
if (unlikely(vaddr & (sizeof(u64) - 1)))
goto nack_inv;
rkey = be32_to_cpu(ateth->rkey);
@@ -1649,63 +1770,50 @@ void ipath_rc_rcv(struct ipath_ibdev *de
sizeof(u64), vaddr, rkey,
IB_ACCESS_REMOTE_ATOMIC)))
goto nack_acc;
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_ATOMIC)))
- goto nack_acc;
/* Perform atomic OP and save result. */
+ maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
sdata = be64_to_cpu(ateth->swap_data);
- spin_lock_irq(&dev->pending_lock);
- qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr;
- if (opcode == OP(FETCH_ADD))
- *(u64 *) qp->r_sge.sge.vaddr =
- qp->r_atomic_data + sdata;
- else if (qp->r_atomic_data ==
- be64_to_cpu(ateth->compare_data))
- *(u64 *) qp->r_sge.sge.vaddr = sdata;
- spin_unlock_irq(&dev->pending_lock);
+ e = &qp->s_ack_queue[qp->r_head_ack_queue];
+ e->atomic_data = (opcode == OP(FETCH_ADD)) ?
+ (u64) atomic64_add_return(sdata, maddr) - sdata :
+ (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
+ be64_to_cpu(ateth->compare_data),
+ sdata);
+ e->opcode = opcode;
+ e->psn = psn & IPATH_PSN_MASK;
qp->r_msn++;
- qp->r_atomic_psn = psn & IPATH_PSN_MASK;
- psn |= 1 << 31;
- break;
+ qp->r_psn++;
+ qp->r_state = opcode;
+ qp->r_nak_state = 0;
+ barrier();
+ qp->r_head_ack_queue = next;
+
+ /* Call ipath_do_rc_send() in another thread. */
+ tasklet_hi_schedule(&qp->s_task);
+
+ goto done;
}

default:
- /* Drop packet for unknown opcodes. */
- goto done;
+ /* NAK unknown opcodes. */
+ goto nack_inv;
}
qp->r_psn++;
qp->r_state = opcode;
+ qp->r_ack_psn = psn;
qp->r_nak_state = 0;
/* Send an ACK if requested or required. */
- if (psn & (1 << 31)) {
- /*
- * Coalesce ACKs unless there is a RDMA READ or
- * ATOMIC pending.
- */
- if (qp->r_ack_state < OP(COMPARE_SWAP)) {
- qp->r_ack_state = opcode;
- qp->r_ack_psn = psn;
- }
+ if (psn & (1 << 31))
goto send_ack;
- }
goto done;

nack_acc:
- /*
- * A NAK will ACK earlier sends and RDMA writes.
- * Don't queue the NAK if a RDMA read, atomic, or NAK
- * is pending though.
- */
- if (qp->r_ack_state < OP(COMPARE_SWAP)) {
- ipath_rc_error(qp, IB_WC_REM_ACCESS_ERR);
- qp->r_ack_state = OP(RDMA_WRITE_ONLY);
- qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
- qp->r_ack_psn = qp->r_psn;
- }
+ ipath_rc_error(qp, IB_WC_REM_ACCESS_ERR);
+ qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
+ qp->r_ack_psn = qp->r_psn;
+
send_ack:
- /* Send ACK right away unless the send tasklet has a pending ACK. */
- if (qp->s_ack_state == OP(ACKNOWLEDGE))
- send_rc_ack(qp);
+ send_rc_ack(qp);

done:
return;
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_ruc.c
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_ruc.c Thu Mar 15 14:34:24 2007 -0700
@@ -255,6 +255,7 @@ static void ipath_ruc_loopback(struct ip
unsigned long flags;
struct ib_wc wc;
u64 sdata;
+ atomic64_t *maddr;

qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
if (!qp) {
@@ -311,7 +312,7 @@ again:
sqp->s_rnr_retry--;
dev->n_rnr_naks++;
sqp->s_rnr_timeout =
- ib_ipath_rnr_table[sqp->r_min_rnr_timer];
+ ib_ipath_rnr_table[qp->r_min_rnr_timer];
ipath_insert_rnr_queue(sqp);
goto done;
}
@@ -344,20 +345,22 @@ again:
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;
}
break;

case IB_WR_RDMA_READ:
+ if (unlikely(!(qp->qp_access_flags &
+ IB_ACCESS_REMOTE_READ)))
+ goto acc_err;
if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length,
wqe->wr.wr.rdma.remote_addr,
wqe->wr.wr.rdma.rkey,
IB_ACCESS_REMOTE_READ)))
goto acc_err;
- if (unlikely(!(qp->qp_access_flags &
- IB_ACCESS_REMOTE_READ)))
- goto acc_err;
qp->r_sge.sge = wqe->sg_list[0];
qp->r_sge.sg_list = wqe->sg_list + 1;
qp->r_sge.num_sge = wqe->wr.num_sge;
@@ -365,22 +368,22 @@ again:

case IB_WR_ATOMIC_CMP_AND_SWP:
case IB_WR_ATOMIC_FETCH_AND_ADD:
+ if (unlikely(!(qp->qp_access_flags &
+ IB_ACCESS_REMOTE_ATOMIC)))
+ goto acc_err;
if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64),
- wqe->wr.wr.rdma.remote_addr,
- wqe->wr.wr.rdma.rkey,
+ wqe->wr.wr.atomic.remote_addr,
+ wqe->wr.wr.atomic.rkey,
IB_ACCESS_REMOTE_ATOMIC)))
goto acc_err;
/* Perform atomic OP and save result. */
- sdata = wqe->wr.wr.atomic.swap;
- spin_lock_irqsave(&dev->pending_lock, flags);
- qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr;
- if (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)
- *(u64 *) qp->r_sge.sge.vaddr =
- qp->r_atomic_data + sdata;
- else if (qp->r_atomic_data == wqe->wr.wr.atomic.compare_add)
- *(u64 *) qp->r_sge.sge.vaddr = sdata;
- spin_unlock_irqrestore(&dev->pending_lock, flags);
- *(u64 *) sqp->s_sge.sge.vaddr = qp->r_atomic_data;
+ maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
+ sdata = wqe->wr.wr.atomic.compare_add;
+ *(u64 *) sqp->s_sge.sge.vaddr =
+ (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
+ (u64) atomic64_add_return(sdata, maddr) - sdata :
+ (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
+ sdata, wqe->wr.wr.atomic.swap);
goto send_comp;

default:
@@ -441,7 +444,7 @@ send_comp:
send_comp:
sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;

- if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->s_flags) ||
+ if (!(sqp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
wc.wr_id = wqe->wr.wr_id;
wc.status = IB_WC_SUCCESS;
@@ -503,7 +506,7 @@ void ipath_no_bufs_available(struct ipat
* We clear the tasklet flag now since we are committing to return
* from the tasklet function.
*/
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
+ clear_bit(IPATH_S_BUSY, &qp->s_busy);
tasklet_unlock(&qp->s_task);
want_buffer(dev->dd);
dev->n_piowait++;
@@ -540,6 +543,9 @@ int ipath_post_ruc_send(struct ipath_qp
(wr->num_sge == 0 ||
wr->sg_list[0].length < sizeof(u64) ||
wr->sg_list[0].addr & (sizeof(u64) - 1))) {
+ ret = -EINVAL;
+ goto bail;
+ } else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic) {
ret = -EINVAL;
goto bail;
}
@@ -648,7 +654,7 @@ void ipath_do_ruc_send(unsigned long dat
u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
struct ipath_other_headers *ohdr;

- if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
+ if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy))
goto bail;

if (unlikely(qp->remote_ah_attr.dlid == dev->dd->ipath_lid)) {
@@ -684,19 +690,15 @@ again:
*/
spin_lock_irqsave(&qp->s_lock, flags);

- /* Sending responses has higher priority over sending requests. */
- if (qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE &&
- (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0)
- bth2 = qp->s_ack_psn++ & IPATH_PSN_MASK;
- else if (!((qp->ibqp.qp_type == IB_QPT_RC) ?
- ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) :
- ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) {
+ if (!((qp->ibqp.qp_type == IB_QPT_RC) ?
+ ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) :
+ ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) {
/*
* Clear the busy bit before unlocking to avoid races with
* adding new work queue items and then failing to process
* them.
*/
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
+ clear_bit(IPATH_S_BUSY, &qp->s_busy);
spin_unlock_irqrestore(&qp->s_lock, flags);
goto bail;
}
@@ -729,7 +731,7 @@ again:
goto again;

clear:
- clear_bit(IPATH_S_BUSY, &qp->s_flags);
+ clear_bit(IPATH_S_BUSY, &qp->s_busy);
bail:
return;
}
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_uc.c
--- a/drivers/infiniband/hw/ipath/ipath_uc.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_uc.c Thu Mar 15 14:34:24 2007 -0700
@@ -42,7 +42,7 @@ static void complete_last_send(struct ip
{
if (++qp->s_last == qp->s_size)
qp->s_last = 0;
- if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
+ if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
wc->wr_id = wqe->wr.wr_id;
wc->status = IB_WC_SUCCESS;
@@ -344,13 +344,13 @@ void ipath_uc_rcv(struct ipath_ibdev *de
send_first:
if (qp->r_reuse_sge) {
qp->r_reuse_sge = 0;
- qp->r_sge = qp->s_rdma_sge;
+ qp->r_sge = qp->s_rdma_read_sge;
} else if (!ipath_get_rwqe(qp, 0)) {
dev->n_pkt_drops++;
goto done;
}
/* Save the WQE so we can reuse it in case of an error. */
- qp->s_rdma_sge = qp->r_sge;
+ qp->s_rdma_read_sge = qp->r_sge;
qp->r_rcv_len = 0;
if (opcode == OP(SEND_ONLY))
goto send_last;
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_ud.c
--- a/drivers/infiniband/hw/ipath/ipath_ud.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c Thu Mar 15 14:34:24 2007 -0700
@@ -467,7 +467,7 @@ int ipath_post_ud_send(struct ipath_qp *

done:
/* Queue the completion status entry. */
- if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &qp->s_flags) ||
+ if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
(wr->send_flags & IB_SEND_SIGNALED)) {
wc.wr_id = wr->wr_id;
wc.status = IB_WC_SUCCESS;
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_verbs.c
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c Thu Mar 15 14:34:24 2007 -0700
@@ -773,7 +773,6 @@ int ipath_verbs_send(struct ipath_devdat
/* +1 is for the qword padding of pbc */
plen = hdrwords + ((len + 3) >> 2) + 1;
if (unlikely((plen << 2) > dd->ipath_ibmaxlen)) {
- ipath_dbg("packet len 0x%x too long, failing\n", plen);
ret = -EINVAL;
goto bail;
}
@@ -980,14 +979,14 @@ static int ipath_query_device(struct ib_
props->max_cqe = ib_ipath_max_cqes;
props->max_mr = dev->lk_table.max;
props->max_pd = ib_ipath_max_pds;
- props->max_qp_rd_atom = 1;
- props->max_qp_init_rd_atom = 1;
+ props->max_qp_rd_atom = IPATH_MAX_RDMA_ATOMIC;
+ props->max_qp_init_rd_atom = 255;
/* props->max_res_rd_atom */
props->max_srq = ib_ipath_max_srqs;
props->max_srq_wr = ib_ipath_max_srq_wrs;
props->max_srq_sge = ib_ipath_max_srq_sges;
/* props->local_ca_ack_delay */
- props->atomic_cap = IB_ATOMIC_HCA;
+ props->atomic_cap = IB_ATOMIC_GLOB;
props->max_pkeys = ipath_get_npkeys(dev->dd);
props->max_mcast_grp = ib_ipath_max_mcast_grps;
props->max_mcast_qp_attach = ib_ipath_max_mcast_qp_attached;
diff -r 78ae7bddbd5e -r 02b57b02578b drivers/infiniband/hw/ipath/ipath_verbs.h
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h Thu Mar 15 14:34:24 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h Thu Mar 15 14:34:24 2007 -0700
@@ -43,6 +43,8 @@

#include "ipath_layer.h"

+#define IPATH_MAX_RDMA_ATOMIC 4
+
#define QPN_MAX (1 << 24)
#define QPNMAP_ENTRIES (QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)

@@ -89,7 +91,7 @@ struct ib_reth {
} __attribute__ ((packed));

struct ib_atomic_eth {
- __be64 vaddr;
+ __be32 vaddr[2]; /* unaligned so access as 2 32-bit words */
__be32 rkey;
__be64 swap_data;
__be64 compare_data;
@@ -108,7 +110,7 @@ struct ipath_other_headers {
} rc;
struct {
__be32 aeth;
- __be64 atomic_ack_eth;
+ __be32 atomic_ack_eth[2];
} at;
__be32 imm_data;
__be32 aeth;
@@ -309,6 +311,19 @@ struct ipath_sge_state {
struct ipath_sge *sg_list; /* next SGE to be used if any */
struct ipath_sge sge; /* progress state for the current SGE */
u8 num_sge;
+};
+
+/*
+ * This structure holds the information that the send tasklet needs
+ * to send a RDMA read response or atomic operation.
+ */
+struct ipath_ack_entry {
+ u8 opcode;
+ u32 psn;
+ union {
+ struct ipath_sge_state rdma_sge;
+ u64 atomic_data;
+ };
};

/*
@@ -333,24 +348,24 @@ struct ipath_qp {
struct ipath_mmap_info *ip;
struct ipath_sge_state *s_cur_sge;
struct ipath_sge_state s_sge; /* current send request data */
- /* current RDMA read send data */
- struct ipath_sge_state s_rdma_sge;
+ struct ipath_ack_entry s_ack_queue[IPATH_MAX_RDMA_ATOMIC + 1];
+ struct ipath_sge_state s_ack_rdma_sge;
+ struct ipath_sge_state s_rdma_read_sge;
struct ipath_sge_state r_sge; /* current receive data */
spinlock_t s_lock;
- unsigned long s_flags;
+ unsigned long s_busy;
u32 s_hdrwords; /* size of s_hdr in 32 bit words */
u32 s_cur_size; /* size of send packet in bytes */
u32 s_len; /* total length of s_sge */
- u32 s_rdma_len; /* total length of s_rdma_sge */
+ u32 s_rdma_read_len; /* total length of s_rdma_read_sge */
u32 s_next_psn; /* PSN for next request */
u32 s_last_psn; /* last response PSN processed */
u32 s_psn; /* current packet sequence number */
- u32 s_ack_psn; /* PSN for RDMA_READ */
+ u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */
+ u32 s_ack_psn; /* PSN for acking sends and RDMA writes */
u32 s_rnr_timeout; /* number of milliseconds for RNR timeout */
u32 r_ack_psn; /* PSN for next ACK or atomic ACK */
u64 r_wr_id; /* ID for current receive WQE */
- u64 r_atomic_data; /* data for last atomic op */
- u32 r_atomic_psn; /* PSN of last atomic op */
u32 r_len; /* total length of r_sge */
u32 r_rcv_len; /* receive data len processed */
u32 r_psn; /* expected rcv packet sequence number */
@@ -360,12 +375,13 @@ struct ipath_qp {
u8 s_ack_state; /* opcode of packet to ACK */
u8 s_nak_state; /* non-zero if NAK is pending */
u8 r_state; /* opcode of last packet received */
- u8 r_ack_state; /* opcode of packet to ACK */
u8 r_nak_state; /* non-zero if NAK is pending */
u8 r_min_rnr_timer; /* retry timeout value for RNR NAKs */
u8 r_reuse_sge; /* for UC receive errors */
u8 r_sge_inx; /* current index into sg_list */
u8 r_wrid_valid; /* r_wrid set but CQ entry not yet made */
+ u8 r_max_rd_atomic; /* max number of RDMA read/atomic to receive */
+ u8 r_head_ack_queue; /* index into s_ack_queue[] */
u8 qp_access_flags;
u8 s_max_sge; /* size of s_wq->sg_list */
u8 s_retry_cnt; /* number of times to retry */
@@ -374,6 +390,10 @@ struct ipath_qp {
u8 s_rnr_retry; /* requester RNR retry counter */
u8 s_wait_credit; /* limit number of unacked packets sent */
u8 s_pkey_index; /* PKEY index to use */
+ u8 s_max_rd_atomic; /* max number of RDMA read/atomic to send */
+ u8 s_num_rd_atomic; /* number of RDMA read/atomic pending */
+ u8 s_tail_ack_queue; /* index into s_ack_queue[] */
+ u8 s_flags;
u8 timeout; /* Timeout for this QP */
enum ib_mtu path_mtu;
u32 remote_qpn;
@@ -390,11 +410,16 @@ struct ipath_qp {
struct ipath_sge r_sg_list[0]; /* verified SGEs */
};

+/* Bit definition for s_busy. */
+#define IPATH_S_BUSY 0
+
/*
* Bit definitions for s_flags.
*/
-#define IPATH_S_BUSY 0
-#define IPATH_S_SIGNAL_REQ_WR 1
+#define IPATH_S_SIGNAL_REQ_WR 0x01
+#define IPATH_S_FENCE_PENDING 0x02
+#define IPATH_S_RDMAR_PENDING 0x04
+#define IPATH_S_ACK_PENDING 0x08

#define IPATH_PSN_CREDIT 2048

@@ -757,9 +782,6 @@ u32 ipath_make_grh(struct ipath_ibdev *d

void ipath_do_ruc_send(unsigned long data);

-u32 ipath_make_rc_ack(struct ipath_qp *qp, struct ipath_other_headers *ohdr,
- u32 pmtu);
-
int ipath_make_rc_req(struct ipath_qp *qp, struct ipath_other_headers *ohdr,
u32 pmtu, u32 *bth0p, u32 *bth2p);

-
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