[PATCH 22 of 53] ipath - fix "many lost ticks" warning
From: Bryan O'Sullivan
Date: Fri May 12 2006 - 20:00:19 EST
Don't disable interrupts for long, or the kernel gets shirty.
Signed-off-by: Bryan O'Sullivan <bos@xxxxxxxxxxxxx>
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_keys.c
--- a/drivers/infiniband/hw/ipath/ipath_keys.c Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_keys.c Fri May 12 15:55:28 2006 -0700
@@ -120,6 +120,7 @@ int ipath_lkey_ok(struct ipath_lkey_tabl
struct ib_sge *sge, int acc)
{
struct ipath_mregion *mr;
+ unsigned n, m;
size_t off;
int ret;
@@ -151,20 +152,22 @@ int ipath_lkey_ok(struct ipath_lkey_tabl
}
off += mr->offset;
+ m = 0;
+ n = 0;
+ while (off >= mr->map[m]->segs[n].length) {
+ off -= mr->map[m]->segs[n].length;
+ n++;
+ if (n >= IPATH_SEGSZ) {
+ m++;
+ n = 0;
+ }
+ }
isge->mr = mr;
- isge->m = 0;
- isge->n = 0;
- while (off >= mr->map[isge->m]->segs[isge->n].length) {
- off -= mr->map[isge->m]->segs[isge->n].length;
- isge->n++;
- if (isge->n >= IPATH_SEGSZ) {
- isge->m++;
- isge->n = 0;
- }
- }
- isge->vaddr = mr->map[isge->m]->segs[isge->n].vaddr + off;
- isge->length = mr->map[isge->m]->segs[isge->n].length - off;
+ isge->vaddr = mr->map[m]->segs[n].vaddr + off;
+ isge->length = mr->map[m]->segs[n].length - off;
isge->sge_length = sge->length;
+ isge->m = m;
+ isge->n = n;
ret = 1;
@@ -189,6 +192,7 @@ int ipath_rkey_ok(struct ipath_ibdev *de
struct ipath_lkey_table *rkt = &dev->lk_table;
struct ipath_sge *sge = &ss->sge;
struct ipath_mregion *mr;
+ unsigned n, m;
size_t off;
int ret;
@@ -206,20 +210,22 @@ int ipath_rkey_ok(struct ipath_ibdev *de
}
off += mr->offset;
+ m = 0;
+ n = 0;
+ while (off >= mr->map[m]->segs[n].length) {
+ off -= mr->map[m]->segs[n].length;
+ n++;
+ if (n >= IPATH_SEGSZ) {
+ m++;
+ n = 0;
+ }
+ }
sge->mr = mr;
- sge->m = 0;
- sge->n = 0;
- while (off >= mr->map[sge->m]->segs[sge->n].length) {
- off -= mr->map[sge->m]->segs[sge->n].length;
- sge->n++;
- if (sge->n >= IPATH_SEGSZ) {
- sge->m++;
- sge->n = 0;
- }
- }
- sge->vaddr = mr->map[sge->m]->segs[sge->n].vaddr + off;
- sge->length = mr->map[sge->m]->segs[sge->n].length - off;
+ sge->vaddr = mr->map[m]->segs[n].vaddr + off;
+ sge->length = mr->map[m]->segs[n].length - off;
sge->sge_length = len;
+ sge->m = m;
+ sge->n = n;
ss->sg_list = NULL;
ss->num_sge = 1;
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_qp.c
--- a/drivers/infiniband/hw/ipath/ipath_qp.c Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_qp.c Fri May 12 15:55:28 2006 -0700
@@ -332,10 +332,11 @@ 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_hdrwords = 0;
qp->s_psn = 0;
qp->r_psn = 0;
- atomic_set(&qp->msn, 0);
+ qp->r_msn = 0;
if (qp->ibqp.qp_type == IB_QPT_RC) {
qp->s_state = IB_OPCODE_RC_SEND_LAST;
qp->r_state = IB_OPCODE_RC_SEND_LAST;
@@ -344,7 +345,8 @@ static void ipath_reset_qp(struct ipath_
qp->r_state = IB_OPCODE_UC_SEND_LAST;
}
qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
- qp->s_nak_state = 0;
+ qp->r_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
+ qp->r_nak_state = 0;
qp->s_rnr_timeout = 0;
qp->s_head = 0;
qp->s_tail = 0;
@@ -362,10 +364,10 @@ static void ipath_reset_qp(struct ipath_
* @qp: the QP to put into an error state
*
* Flushes both send and receive work queues.
- * QP r_rq.lock and s_lock should be held.
- */
-
-static void ipath_error_qp(struct ipath_qp *qp)
+ * QP s_lock should be held.
+ */
+
+void ipath_error_qp(struct ipath_qp *qp)
{
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
struct ib_wc wc;
@@ -408,12 +410,14 @@ static void ipath_error_qp(struct ipath_
qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
wc.opcode = IB_WC_RECV;
+ spin_lock(&qp->r_rq.lock);
while (qp->r_rq.tail != qp->r_rq.head) {
wc.wr_id = get_rwqe_ptr(&qp->r_rq, qp->r_rq.tail)->wr_id;
if (++qp->r_rq.tail >= qp->r_rq.size)
qp->r_rq.tail = 0;
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
}
+ spin_unlock(&qp->r_rq.lock);
}
/**
@@ -433,8 +437,7 @@ int ipath_modify_qp(struct ib_qp *ibqp,
unsigned long flags;
int ret;
- spin_lock_irqsave(&qp->r_rq.lock, flags);
- spin_lock(&qp->s_lock);
+ spin_lock_irqsave(&qp->s_lock, flags);
cur_state = attr_mask & IB_QP_CUR_STATE ?
attr->cur_qp_state : qp->state;
@@ -505,7 +508,7 @@ int ipath_modify_qp(struct ib_qp *ibqp,
}
if (attr_mask & IB_QP_MIN_RNR_TIMER)
- qp->s_min_rnr_timer = attr->min_rnr_timer;
+ qp->r_min_rnr_timer = attr->min_rnr_timer;
if (attr_mask & IB_QP_QKEY)
qp->qkey = attr->qkey;
@@ -514,25 +517,13 @@ int ipath_modify_qp(struct ib_qp *ibqp,
qp->s_pkey_index = attr->pkey_index;
qp->state = new_state;
- spin_unlock(&qp->s_lock);
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
-
- /*
- * If QP1 changed to the RTS state, try to move to the link to INIT
- * even if it was ACTIVE so the SM will reinitialize the SMA's
- * state.
- */
- if (qp->ibqp.qp_num == 1 && new_state == IB_QPS_RTS) {
- struct ipath_ibdev *dev = to_idev(ibqp->device);
-
- ipath_layer_set_linkstate(dev->dd, IPATH_IB_LINKDOWN);
- }
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+
ret = 0;
goto bail;
inval:
- spin_unlock(&qp->s_lock);
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
+ spin_unlock_irqrestore(&qp->s_lock, flags);
ret = -EINVAL;
bail:
@@ -566,7 +557,7 @@ int ipath_query_qp(struct ib_qp *ibqp, s
attr->sq_draining = 0;
attr->max_rd_atomic = 1;
attr->max_dest_rd_atomic = 1;
- attr->min_rnr_timer = qp->s_min_rnr_timer;
+ attr->min_rnr_timer = qp->r_min_rnr_timer;
attr->port_num = 1;
attr->timeout = 0;
attr->retry_cnt = qp->s_retry_cnt;
@@ -593,16 +584,12 @@ int ipath_query_qp(struct ib_qp *ibqp, s
* @qp: the queue pair to compute the AETH for
*
* Returns the AETH.
- *
- * The QP s_lock should be held.
*/
__be32 ipath_compute_aeth(struct ipath_qp *qp)
{
- u32 aeth = atomic_read(&qp->msn) & IPS_MSN_MASK;
-
- if (qp->s_nak_state) {
- aeth |= qp->s_nak_state << IPS_AETH_CREDIT_SHIFT;
- } else if (qp->ibqp.srq) {
+ u32 aeth = qp->r_msn & IPS_MSN_MASK;
+
+ if (qp->ibqp.srq) {
/*
* Shared receive queues don't generate credits.
* Set the credit field to the invalid value.
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_rc.c
--- a/drivers/infiniband/hw/ipath/ipath_rc.c Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c Fri May 12 15:55:28 2006 -0700
@@ -41,7 +41,7 @@
* @qp: the QP who's SGE we're restarting
* @wqe: the work queue to initialize the QP's SGE from
*
- * The QP s_lock should be held.
+ * The QP s_lock should be held and interrupts disabled.
*/
static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe)
{
@@ -64,7 +64,7 @@ static void ipath_init_restart(struct ip
}
/**
- * ipath_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read)
+ * ipath_make_rc_ack - construct a RDMA read response packet
* @qp: a pointer to the QP
* @ohdr: a pointer to the IB header being constructed
* @pmtu: the path MTU
@@ -76,7 +76,6 @@ u32 ipath_make_rc_ack(struct ipath_qp *q
struct ipath_other_headers *ohdr,
u32 pmtu)
{
- struct ipath_sge_state *ss;
u32 hwords;
u32 len;
u32 bth0;
@@ -90,7 +89,6 @@ u32 ipath_make_rc_ack(struct ipath_qp *q
*/
switch (qp->s_ack_state) {
case OP(RDMA_READ_REQUEST):
- ss = &qp->s_rdma_sge;
len = qp->s_rdma_len;
if (len > pmtu) {
len = pmtu;
@@ -107,7 +105,6 @@ u32 ipath_make_rc_ack(struct ipath_qp *q
qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
/* FALLTHROUGH */
case OP(RDMA_READ_RESPONSE_MIDDLE):
- ss = &qp->s_rdma_sge;
len = qp->s_rdma_len;
if (len > pmtu)
len = pmtu;
@@ -122,44 +119,18 @@ u32 ipath_make_rc_ack(struct ipath_qp *q
case OP(RDMA_READ_RESPONSE_LAST):
case OP(RDMA_READ_RESPONSE_ONLY):
+ default:
/*
* We have to prevent new requests from changing
* the r_sge state while a ipath_verbs_send()
* is in progress.
- * Changing r_state allows the receiver
- * to continue processing new packets.
- * We do it here now instead of above so
- * that we are sure the packet was sent before
- * changing the state.
- */
- qp->r_state = OP(RDMA_READ_RESPONSE_LAST);
+ */
qp->s_ack_state = OP(ACKNOWLEDGE);
bth0 = 0;
goto bail;
-
- case OP(COMPARE_SWAP):
- case OP(FETCH_ADD):
- ss = NULL;
- len = 0;
- qp->r_state = OP(SEND_LAST);
- qp->s_ack_state = OP(ACKNOWLEDGE);
- bth0 = OP(ATOMIC_ACKNOWLEDGE) << 24;
- ohdr->u.at.aeth = ipath_compute_aeth(qp);
- ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic);
- hwords += sizeof(ohdr->u.at) / 4;
- break;
-
- default:
- /* Send a regular ACK. */
- ss = NULL;
- len = 0;
- qp->s_ack_state = OP(ACKNOWLEDGE);
- bth0 = qp->s_ack_state << 24;
- ohdr->u.aeth = ipath_compute_aeth(qp);
- hwords++;
}
qp->s_hdrwords = hwords;
- qp->s_cur_sge = ss;
+ qp->s_cur_sge = &qp->s_rdma_sge;
qp->s_cur_size = len;
bail:
@@ -175,7 +146,7 @@ bail:
* @bth2p: pointer to the BTH PSN word
*
* Return 1 if constructed; otherwise, return 0.
- * Note the QP s_lock must be held.
+ * Note the QP s_lock must be held and interrupts disabled.
*/
int ipath_make_rc_req(struct ipath_qp *qp,
struct ipath_other_headers *ohdr,
@@ -532,11 +503,16 @@ static void send_rc_ack(struct ipath_qp
ohdr = &hdr.u.l.oth;
lrh0 = IPS_LRH_GRH;
}
+ /* read pkey_index w/o lock (its atomic) */
bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
- ohdr->u.aeth = ipath_compute_aeth(qp);
- if (qp->s_ack_state >= OP(COMPARE_SWAP)) {
+ if (qp->r_nak_state)
+ ohdr->u.aeth = (qp->r_msn & IPS_MSN_MASK) |
+ (qp->r_nak_state << IPS_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->s_ack_atomic);
+ 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;
@@ -547,13 +523,13 @@ static void send_rc_ack(struct ipath_qp
hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
- ohdr->bth[2] = cpu_to_be32(qp->s_ack_psn & IPS_PSN_MASK);
+ ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & IPS_PSN_MASK);
/*
* If we can send the ACK, clear the ACK state.
*/
if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) {
- qp->s_ack_state = OP(ACKNOWLEDGE);
+ qp->r_ack_state = OP(ACKNOWLEDGE);
dev->n_unicast_xmit++;
} else
dev->n_rc_qacks++;
@@ -647,7 +623,7 @@ done:
* @psn: packet sequence number for the request
* @wc: the work completion request
*
- * The QP s_lock should be held.
+ * The QP s_lock should be held and interrupts disabled.
*/
void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc)
{
@@ -711,7 +687,7 @@ bail:
*
* This is called from ipath_rc_rcv_resp() to process an incoming RC ACK
* for the given QP.
- * Called at interrupt level with the QP s_lock held.
+ * Called at interrupt level with the QP s_lock held and interrupts disabled.
* Returns 1 if OK, 0 if current operation should be aborted (NAK).
*/
static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode)
@@ -1125,8 +1101,6 @@ static inline int ipath_rc_rcv_error(str
{
struct ib_reth *reth;
- spin_lock(&qp->s_lock);
-
if (diff > 0) {
/*
* Packet sequence error.
@@ -1134,15 +1108,16 @@ static inline int ipath_rc_rcv_error(str
* Don't queue the NAK if a RDMA read, atomic, or
* NAK is pending though.
*/
- if ((qp->s_ack_state >= OP(RDMA_READ_REQUEST) &&
- qp->s_ack_state != OP(ACKNOWLEDGE)) ||
- qp->s_nak_state != 0)
+ if (qp->s_ack_state != OP(ACKNOWLEDGE) ||
+ qp->r_nak_state != 0)
goto done;
- qp->s_ack_state = OP(SEND_ONLY);
- qp->s_nak_state = IB_NAK_PSN_ERROR;
- /* Use the expected PSN. */
- qp->s_ack_psn = qp->r_psn;
- goto resched;
+ if (qp->r_ack_state < OP(COMPARE_SWAP)) {
+ qp->r_ack_state = OP(SEND_ONLY);
+ qp->r_nak_state = IB_NAK_PSN_ERROR;
+ /* Use the expected PSN. */
+ qp->r_ack_psn = qp->r_psn;
+ }
+ goto send_ack;
}
/*
@@ -1156,30 +1131,29 @@ static inline int ipath_rc_rcv_error(str
* send the earliest so that RDMA reads can be restarted at
* the requester's expected PSN.
*/
- if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
- ipath_cmp24(psn, qp->s_ack_psn) >= 0) {
- if (qp->s_ack_state < OP(RDMA_READ_REQUEST))
- qp->s_ack_psn = psn;
- goto done;
- }
- switch (opcode) {
- case OP(RDMA_READ_REQUEST):
- /*
- * We have to be careful to not change s_rdma_sge
- * while ipath_do_rc_send() is using it and not
- * holding the s_lock.
- */
- if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
- qp->s_ack_state >= OP(RDMA_READ_REQUEST)) {
- dev->n_rdma_dup_busy++;
- goto done;
- }
+ if (opcode == OP(RDMA_READ_REQUEST)) {
/* RETH comes after BTH */
if (!header_in_data)
reth = &ohdr->u.rc.reth;
else {
reth = (struct ib_reth *)data;
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) {
@@ -1194,8 +1168,10 @@ static inline int ipath_rc_rcv_error(str
ok = ipath_rkey_ok(dev, &qp->s_rdma_sge,
qp->s_rdma_len, vaddr, rkey,
IB_ACCESS_REMOTE_READ);
- if (unlikely(!ok))
+ if (unlikely(!ok)) {
+ spin_unlock_irq(&qp->s_lock);
goto done;
+ }
} else {
qp->s_rdma_sge.sg_list = NULL;
qp->s_rdma_sge.num_sge = 0;
@@ -1204,8 +1180,30 @@ static inline int ipath_rc_rcv_error(str
qp->s_rdma_sge.sge.length = 0;
qp->s_rdma_sge.sge.sge_length = 0;
}
- break;
-
+ 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) {
case OP(COMPARE_SWAP):
case OP(FETCH_ADD):
/*
@@ -1214,17 +1212,15 @@ static inline int ipath_rc_rcv_error(str
*/
if ((psn & IPS_PSN_MASK) != qp->r_atomic_psn)
goto done;
- qp->s_ack_atomic = qp->r_atomic_data;
break;
}
- qp->s_ack_state = opcode;
- qp->s_nak_state = 0;
- qp->s_ack_psn = psn;
-resched:
+ qp->r_ack_state = opcode;
+ qp->r_nak_state = 0;
+ qp->r_ack_psn = psn;
+send_ack:
return 0;
done:
- spin_unlock(&qp->s_lock);
return 1;
}
@@ -1249,7 +1245,6 @@ void ipath_rc_rcv(struct ipath_ibdev *de
u32 hdrsize;
u32 psn;
u32 pad;
- unsigned long flags;
struct ib_wc wc;
u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
int diff;
@@ -1290,10 +1285,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de
opcode <= OP(ATOMIC_ACKNOWLEDGE)) {
ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn,
hdrsize, pmtu, header_in_data);
- goto bail;
- }
-
- spin_lock_irqsave(&qp->r_rq.lock, flags);
+ goto done;
+ }
/* Compute 24 bits worth of difference. */
diff = ipath_cmp24(psn, qp->r_psn);
@@ -1301,7 +1294,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode,
psn, diff, header_in_data))
goto done;
- goto resched;
+ goto send_ack;
}
/* Check for opcode sequence errors. */
@@ -1318,18 +1311,14 @@ void ipath_rc_rcv(struct ipath_ibdev *de
* Don't queue the NAK if a RDMA read, atomic, or NAK
* is pending though.
*/
- spin_lock(&qp->s_lock);
- if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) &&
- qp->s_ack_state != OP(ACKNOWLEDGE)) {
- spin_unlock(&qp->s_lock);
- goto done;
- }
+ if (qp->r_ack_state >= OP(COMPARE_SWAP))
+ goto send_ack;
/* XXX Flush WQEs */
qp->state = IB_QPS_ERR;
- qp->s_ack_state = OP(SEND_ONLY);
- qp->s_nak_state = IB_NAK_INVALID_REQUEST;
- qp->s_ack_psn = qp->r_psn;
- goto resched;
+ 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;
case OP(RDMA_WRITE_FIRST):
case OP(RDMA_WRITE_MIDDLE):
@@ -1338,20 +1327,6 @@ void ipath_rc_rcv(struct ipath_ibdev *de
opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
break;
goto nack_inv;
-
- case OP(RDMA_READ_REQUEST):
- case OP(COMPARE_SWAP):
- case OP(FETCH_ADD):
- /*
- * Drop all new requests until a response has been sent. A
- * new request then ACKs the RDMA response we sent. Relaxed
- * ordering would allow new requests to be processed but we
- * would need to keep a queue of rwqe's for all that are in
- * progress. Note that we can't RNR NAK this request since
- * the RDMA READ or atomic response is already queued to be
- * sent (unless we implement a response send queue).
- */
- goto done;
default:
if (opcode == OP(SEND_MIDDLE) ||
@@ -1361,6 +1336,11 @@ void ipath_rc_rcv(struct ipath_ibdev *de
opcode == OP(RDMA_WRITE_LAST) ||
opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
goto nack_inv;
+ /*
+ * Note that it is up to the requester to not send a new
+ * RDMA read or atomic operation before receiving an ACK
+ * for the previous operation.
+ */
break;
}
@@ -1377,16 +1357,12 @@ void ipath_rc_rcv(struct ipath_ibdev *de
* Don't queue the NAK if a RDMA read or atomic
* is pending though.
*/
- spin_lock(&qp->s_lock);
- if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) &&
- qp->s_ack_state != OP(ACKNOWLEDGE)) {
- spin_unlock(&qp->s_lock);
- goto done;
- }
- qp->s_ack_state = OP(SEND_ONLY);
- qp->s_nak_state = IB_RNR_NAK | qp->s_min_rnr_timer;
- qp->s_ack_psn = qp->r_psn;
- goto resched;
+ if (qp->r_ack_state >= OP(COMPARE_SWAP))
+ goto send_ack;
+ qp->r_ack_state = OP(SEND_ONLY);
+ qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer;
+ qp->r_ack_psn = qp->r_psn;
+ goto send_ack;
}
qp->r_rcv_len = 0;
/* FALLTHROUGH */
@@ -1443,7 +1419,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
if (unlikely(wc.byte_len > qp->r_len))
goto nack_inv;
ipath_copy_sge(&qp->r_sge, data, tlen);
- atomic_inc(&qp->msn);
+ qp->r_msn++;
if (opcode == OP(RDMA_WRITE_LAST) ||
opcode == OP(RDMA_WRITE_ONLY))
break;
@@ -1487,29 +1463,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de
ok = ipath_rkey_ok(dev, &qp->r_sge,
qp->r_len, vaddr, rkey,
IB_ACCESS_REMOTE_WRITE);
- if (unlikely(!ok)) {
- 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.
- */
- spin_lock(&qp->s_lock);
- nack_acc1:
- if (qp->s_ack_state >=
- OP(RDMA_READ_REQUEST) &&
- qp->s_ack_state != OP(ACKNOWLEDGE)) {
- spin_unlock(&qp->s_lock);
- goto done;
- }
- /* XXX Flush WQEs */
- qp->state = IB_QPS_ERR;
- qp->s_ack_state = OP(RDMA_WRITE_ONLY);
- qp->s_nak_state =
- IB_NAK_REMOTE_ACCESS_ERROR;
- qp->s_ack_psn = qp->r_psn;
- goto resched;
- }
+ if (unlikely(!ok))
+ goto nack_acc;
} else {
qp->r_sge.sg_list = NULL;
qp->r_sge.sge.mr = NULL;
@@ -1539,16 +1494,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
if (unlikely(!(qp->qp_access_flags &
IB_ACCESS_REMOTE_READ)))
goto nack_acc;
- /*
- * Ignore request if we already have an
- * RDMA read or ATOMIC pending.
- */
- spin_lock(&qp->s_lock);
- if (qp->s_ack_state != OP(ACKNOWLEDGE) &&
- qp->s_ack_state >= OP(RDMA_READ_REQUEST)) {
- spin_unlock(&qp->s_lock);
- goto done;
- }
+ spin_lock_irq(&qp->s_lock);
qp->s_rdma_len = be32_to_cpu(reth->length);
if (qp->s_rdma_len != 0) {
u32 rkey = be32_to_cpu(reth->rkey);
@@ -1560,7 +1506,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
qp->s_rdma_len, vaddr, rkey,
IB_ACCESS_REMOTE_READ);
if (unlikely(!ok))
- goto nack_acc1;
+ goto nack_acc;
/*
* Update the next expected PSN. We add 1 later
* below, so only add the remainder here.
@@ -1580,13 +1526,20 @@ void ipath_rc_rcv(struct ipath_ibdev *de
* finish sending the result since a duplicate request would
* increment it more than once.
*/
- atomic_inc(&qp->msn);
+ qp->r_msn++;
+
qp->s_ack_state = opcode;
- qp->s_nak_state = 0;
qp->s_ack_psn = psn;
+ spin_unlock_irq(&qp->s_lock);
+
qp->r_psn++;
qp->r_state = opcode;
- goto rdmadone;
+ qp->r_nak_state = 0;
+
+ /* Call ipath_do_rc_send() in another thread. */
+ tasklet_hi_schedule(&qp->s_task);
+
+ goto done;
case OP(COMPARE_SWAP):
case OP(FETCH_ADD): {
@@ -1615,7 +1568,7 @@ void ipath_rc_rcv(struct ipath_ibdev *de
goto nack_acc;
/* Perform atomic OP and save result. */
sdata = be64_to_cpu(ateth->swap_data);
- spin_lock(&dev->pending_lock);
+ 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 =
@@ -1623,8 +1576,8 @@ void ipath_rc_rcv(struct ipath_ibdev *de
else if (qp->r_atomic_data ==
be64_to_cpu(ateth->compare_data))
*(u64 *) qp->r_sge.sge.vaddr = sdata;
- spin_unlock(&dev->pending_lock);
- atomic_inc(&qp->msn);
+ spin_unlock_irq(&dev->pending_lock);
+ qp->r_msn++;
qp->r_atomic_psn = psn & IPS_PSN_MASK;
psn |= 1 << 31;
break;
@@ -1636,46 +1589,39 @@ void ipath_rc_rcv(struct ipath_ibdev *de
}
qp->r_psn++;
qp->r_state = opcode;
+ 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.
*/
- spin_lock(&qp->s_lock);
- if (qp->s_ack_state == OP(ACKNOWLEDGE) ||
- qp->s_ack_state < OP(RDMA_READ_REQUEST)) {
- qp->s_ack_state = opcode;
- qp->s_nak_state = 0;
- qp->s_ack_psn = psn;
- qp->s_ack_atomic = qp->r_atomic_data;
- goto resched;
- }
- spin_unlock(&qp->s_lock);
- }
+ if (qp->r_ack_state < OP(COMPARE_SWAP)) {
+ qp->r_ack_state = opcode;
+ qp->r_ack_psn = psn;
+ }
+ 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)) {
+ /* XXX Flush WQEs */
+ qp->state = IB_QPS_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;
+ }
+send_ack:
+ /* Send ACK right away unless a RDMA read is pending. */
+ if (qp->s_ack_state == OP(ACKNOWLEDGE))
+ send_rc_ack(qp);
+
done:
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
- goto bail;
-
-resched:
- /*
- * Try to send ACK right away but not if ipath_do_rc_send() is
- * active.
- */
- if (qp->s_hdrwords == 0 &&
- (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST ||
- qp->s_ack_state >= IB_OPCODE_COMPARE_SWAP))
- send_rc_ack(qp);
- else
- dev->n_rc_qacks++;
-
-rdmadone:
- spin_unlock(&qp->s_lock);
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
-
- /* Call ipath_do_rc_send() in another thread. */
- tasklet_hi_schedule(&qp->s_task);
-
-bail:
return;
}
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_ruc.c
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_ruc.c Fri May 12 15:55:28 2006 -0700
@@ -112,10 +112,11 @@ void ipath_insert_rnr_queue(struct ipath
*
* Return 0 if no RWQE is available, otherwise return 1.
*
- * Called at interrupt level with the QP r_rq.lock held.
+ * Can be called from interrupt level.
*/
int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only)
{
+ unsigned long flags;
struct ipath_rq *rq;
struct ipath_srq *srq;
struct ipath_rwqe *wqe;
@@ -123,6 +124,8 @@ int ipath_get_rwqe(struct ipath_qp *qp,
if (!qp->ibqp.srq) {
rq = &qp->r_rq;
+ spin_lock_irqsave(&rq->lock, flags);
+
if (unlikely(rq->tail == rq->head)) {
ret = 0;
goto bail;
@@ -137,15 +140,14 @@ int ipath_get_rwqe(struct ipath_qp *qp,
}
if (++rq->tail >= rq->size)
rq->tail = 0;
- ret = 1;
- goto bail;
+ goto done;
}
srq = to_isrq(qp->ibqp.srq);
rq = &srq->rq;
- spin_lock(&rq->lock);
+ spin_lock_irqsave(&rq->lock, flags);
+
if (unlikely(rq->tail == rq->head)) {
- spin_unlock(&rq->lock);
ret = 0;
goto bail;
}
@@ -175,13 +177,13 @@ int ipath_get_rwqe(struct ipath_qp *qp,
ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
srq->ibsrq.event_handler(&ev,
srq->ibsrq.srq_context);
- } else
- spin_unlock(&rq->lock);
- } else
- spin_unlock(&rq->lock);
+ }
+ }
+done:
ret = 1;
bail:
+ spin_unlock_irqrestore(&rq->lock, flags);
return ret;
}
@@ -247,10 +249,8 @@ again:
wc.imm_data = wqe->wr.imm_data;
/* FALLTHROUGH */
case IB_WR_SEND:
- spin_lock_irqsave(&qp->r_rq.lock, flags);
if (!ipath_get_rwqe(qp, 0)) {
rnr_nak:
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
/* Handle RNR NAK */
if (qp->ibqp.qp_type == IB_QPT_UC)
goto send_comp;
@@ -262,20 +262,17 @@ again:
sqp->s_rnr_retry--;
dev->n_rnr_naks++;
sqp->s_rnr_timeout =
- ib_ipath_rnr_table[sqp->s_min_rnr_timer];
+ ib_ipath_rnr_table[sqp->r_min_rnr_timer];
ipath_insert_rnr_queue(sqp);
goto done;
}
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
break;
case IB_WR_RDMA_WRITE_WITH_IMM:
wc.wc_flags = IB_WC_WITH_IMM;
wc.imm_data = wqe->wr.imm_data;
- spin_lock_irqsave(&qp->r_rq.lock, flags);
if (!ipath_get_rwqe(qp, 1))
goto rnr_nak;
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
/* FALLTHROUGH */
case IB_WR_RDMA_WRITE:
if (wqe->length == 0)
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_uc.c
--- a/drivers/infiniband/hw/ipath/ipath_uc.c Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_uc.c Fri May 12 15:55:28 2006 -0700
@@ -240,7 +240,6 @@ void ipath_uc_rcv(struct ipath_ibdev *de
u32 hdrsize;
u32 psn;
u32 pad;
- unsigned long flags;
struct ib_wc wc;
u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
struct ib_reth *reth;
@@ -278,8 +277,6 @@ void ipath_uc_rcv(struct ipath_ibdev *de
wc.imm_data = 0;
wc.wc_flags = 0;
- spin_lock_irqsave(&qp->r_rq.lock, flags);
-
/* Compare the PSN verses the expected PSN. */
if (unlikely(ipath_cmp24(psn, qp->r_psn) != 0)) {
/*
@@ -536,15 +533,11 @@ void ipath_uc_rcv(struct ipath_ibdev *de
default:
/* Drop packet for unknown opcodes. */
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
dev->n_pkt_drops++;
- goto bail;
+ goto done;
}
qp->r_psn++;
qp->r_state = opcode;
done:
- spin_unlock_irqrestore(&qp->r_rq.lock, flags);
-
-bail:
return;
}
diff -r 4e0a07d20868 -r 1887e7b3e2a3 drivers/infiniband/hw/ipath/ipath_verbs.h
--- a/drivers/infiniband/hw/ipath/ipath_verbs.h Fri May 12 15:55:28 2006 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.h Fri May 12 15:55:28 2006 -0700
@@ -306,32 +306,33 @@ struct ipath_qp {
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_rnr_timeout; /* number of milliseconds for RNR timeout */
- u32 s_ack_psn; /* PSN for next ACK or RDMA_READ */
- u64 s_ack_atomic; /* data for atomic ACK */
+ 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 */
+ u32 r_msn; /* message sequence number */
u8 state; /* QP state */
u8 s_state; /* opcode of last packet sent */
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 qp_access_flags;
u8 s_max_sge; /* size of s_wq->sg_list */
- u8 qp_access_flags;
u8 s_retry_cnt; /* number of times to retry */
u8 s_rnr_retry_cnt;
- u8 s_min_rnr_timer;
u8 s_retry; /* requester retry counter */
u8 s_rnr_retry; /* requester RNR retry counter */
u8 s_pkey_index; /* PKEY index to use */
enum ib_mtu path_mtu;
- atomic_t msn; /* message sequence number */
u32 remote_qpn;
u32 qkey; /* QKEY for this QP (for UD or RD) */
u32 s_size; /* send work queue size */
-
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