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authorRalph Campbell <ralph.campbell@qlogic.com>2008-05-13 11:41:29 -0700
committerRoland Dreier <rolandd@cisco.com>2008-05-13 11:41:29 -0700
commite509be898d8937634437caa474b57ac12795e5bc (patch)
treef99b0e3965ee0eaf89acccdba382689719881a29 /drivers/infiniband/hw/ipath/ipath_rc.c
parent53dc1ca194c062aa9771e194047f27ec1ca592df (diff)
IB/ipath: Fix many locking issues when switching to error state
The send DMA hardware queue voided a number of prior assumptions about when a send is complete which led to completions being generated out of order. There were also a number of locking issues when switching the QP to the error or reset states, and we implement the IB_QPS_SQD state. Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_rc.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_rc.c151
1 files changed, 97 insertions, 54 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c
index b4b26c3aa61..5b5276a270b 100644
--- a/drivers/infiniband/hw/ipath/ipath_rc.c
+++ b/drivers/infiniband/hw/ipath/ipath_rc.c
@@ -92,6 +92,10 @@ static int ipath_make_rc_ack(struct ipath_ibdev *dev, struct ipath_qp *qp,
u32 bth0;
u32 bth2;
+ /* Don't send an ACK if we aren't supposed to. */
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK))
+ goto bail;
+
/* header size in 32-bit words LRH+BTH = (8+12)/4. */
hwords = 5;
@@ -238,14 +242,25 @@ int ipath_make_rc_req(struct ipath_qp *qp)
ipath_make_rc_ack(dev, qp, ohdr, pmtu))
goto done;
- if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) ||
- qp->s_rnr_timeout || qp->s_wait_credit)
- goto bail;
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) {
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
+ goto bail;
+ /* We are in the error state, flush the work request. */
+ if (qp->s_last == qp->s_head)
+ goto bail;
+ /* If DMAs are in progress, we can't flush immediately. */
+ if (atomic_read(&qp->s_dma_busy)) {
+ qp->s_flags |= IPATH_S_WAIT_DMA;
+ goto bail;
+ }
+ wqe = get_swqe_ptr(qp, qp->s_last);
+ ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
+ goto done;
+ }
- /* Limit the number of packets sent without an ACK. */
- if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT) > 0) {
- qp->s_wait_credit = 1;
- dev->n_rc_stalls++;
+ /* Leave BUSY set until RNR timeout. */
+ if (qp->s_rnr_timeout) {
+ qp->s_flags |= IPATH_S_WAITING;
goto bail;
}
@@ -257,6 +272,9 @@ int ipath_make_rc_req(struct ipath_qp *qp)
wqe = get_swqe_ptr(qp, qp->s_cur);
switch (qp->s_state) {
default:
+ if (!(ib_ipath_state_ops[qp->state] &
+ IPATH_PROCESS_NEXT_SEND_OK))
+ goto bail;
/*
* Resend an old request or start a new one.
*
@@ -294,8 +312,10 @@ int ipath_make_rc_req(struct ipath_qp *qp)
case IB_WR_SEND_WITH_IMM:
/* If no credit, return. */
if (qp->s_lsn != (u32) -1 &&
- ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
+ ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) {
+ qp->s_flags |= IPATH_S_WAIT_SSN_CREDIT;
goto bail;
+ }
wqe->lpsn = wqe->psn;
if (len > pmtu) {
wqe->lpsn += (len - 1) / pmtu;
@@ -325,8 +345,10 @@ int ipath_make_rc_req(struct ipath_qp *qp)
case IB_WR_RDMA_WRITE_WITH_IMM:
/* If no credit, return. */
if (qp->s_lsn != (u32) -1 &&
- ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0)
+ ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) {
+ qp->s_flags |= IPATH_S_WAIT_SSN_CREDIT;
goto bail;
+ }
ohdr->u.rc.reth.vaddr =
cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
ohdr->u.rc.reth.rkey =
@@ -570,7 +592,11 @@ int ipath_make_rc_req(struct ipath_qp *qp)
ipath_make_ruc_header(dev, qp, ohdr, bth0 | (qp->s_state << 24), bth2);
done:
ret = 1;
+ goto unlock;
+
bail:
+ qp->s_flags &= ~IPATH_S_BUSY;
+unlock:
spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
@@ -606,7 +632,11 @@ static void send_rc_ack(struct ipath_qp *qp)
spin_unlock_irqrestore(&qp->s_lock, flags);
+ /* Don't try to send ACKs if the link isn't ACTIVE */
dd = dev->dd;
+ if (!(dd->ipath_flags & IPATH_LINKACTIVE))
+ goto done;
+
piobuf = ipath_getpiobuf(dd, 0, NULL);
if (!piobuf) {
/*
@@ -668,15 +698,16 @@ static void send_rc_ack(struct ipath_qp *qp)
goto done;
queue_ack:
- dev->n_rc_qacks++;
- qp->s_flags |= IPATH_S_ACK_PENDING;
- qp->s_nak_state = qp->r_nak_state;
- qp->s_ack_psn = qp->r_ack_psn;
+ if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK) {
+ dev->n_rc_qacks++;
+ qp->s_flags |= IPATH_S_ACK_PENDING;
+ qp->s_nak_state = qp->r_nak_state;
+ qp->s_ack_psn = qp->r_ack_psn;
+
+ /* Schedule the send tasklet. */
+ ipath_schedule_send(qp);
+ }
spin_unlock_irqrestore(&qp->s_lock, flags);
-
- /* Call ipath_do_rc_send() in another thread. */
- tasklet_hi_schedule(&qp->s_task);
-
done:
return;
}
@@ -735,7 +766,7 @@ static void reset_psn(struct ipath_qp *qp, u32 psn)
/*
* Set the state to restart in the middle of a request.
* Don't change the s_sge, s_cur_sge, or s_cur_size.
- * See ipath_do_rc_send().
+ * See ipath_make_rc_req().
*/
switch (opcode) {
case IB_WR_SEND:
@@ -801,7 +832,7 @@ void ipath_restart_rc(struct ipath_qp *qp, u32 psn)
dev->n_rc_resends += (qp->s_psn - psn) & IPATH_PSN_MASK;
reset_psn(qp, psn);
- tasklet_hi_schedule(&qp->s_task);
+ ipath_schedule_send(qp);
bail:
return;
@@ -809,13 +840,7 @@ bail:
static inline void update_last_psn(struct ipath_qp *qp, u32 psn)
{
- if (qp->s_last_psn != psn) {
- qp->s_last_psn = psn;
- if (qp->s_wait_credit) {
- qp->s_wait_credit = 0;
- tasklet_hi_schedule(&qp->s_task);
- }
- }
+ qp->s_last_psn = psn;
}
/**
@@ -915,14 +940,10 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode,
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);
- }
+ if (((qp->s_flags & IPATH_S_FENCE_PENDING) &&
+ !qp->s_num_rd_atomic) ||
+ qp->s_flags & IPATH_S_RDMAR_PENDING)
+ ipath_schedule_send(qp);
}
/* Post a send completion queue entry if requested. */
if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) ||
@@ -956,6 +977,8 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode,
} else {
if (++qp->s_last >= qp->s_size)
qp->s_last = 0;
+ if (qp->state == IB_QPS_SQD && qp->s_last == qp->s_cur)
+ qp->s_draining = 0;
if (qp->s_last == qp->s_tail)
break;
wqe = get_swqe_ptr(qp, qp->s_last);
@@ -979,7 +1002,7 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode,
*/
if (ipath_cmp24(qp->s_psn, psn) <= 0) {
reset_psn(qp, psn + 1);
- tasklet_hi_schedule(&qp->s_task);
+ ipath_schedule_send(qp);
}
} else if (ipath_cmp24(qp->s_psn, psn) <= 0) {
qp->s_state = OP(SEND_LAST);
@@ -1018,6 +1041,7 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode,
ib_ipath_rnr_table[(aeth >> IPATH_AETH_CREDIT_SHIFT) &
IPATH_AETH_CREDIT_MASK];
ipath_insert_rnr_queue(qp);
+ ipath_schedule_send(qp);
goto bail;
case 3: /* NAK */
@@ -1108,6 +1132,10 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev,
spin_lock_irqsave(&qp->s_lock, flags);
+ /* Double check we can process this now that we hold the s_lock. */
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK))
+ goto ack_done;
+
/* Ignore invalid responses. */
if (ipath_cmp24(psn, qp->s_next_psn) >= 0)
goto ack_done;
@@ -1343,7 +1371,12 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
psn &= IPATH_PSN_MASK;
e = NULL;
old_req = 1;
+
spin_lock_irqsave(&qp->s_lock, flags);
+ /* Double check we can process this now that we hold the s_lock. */
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK))
+ goto unlock_done;
+
for (i = qp->r_head_ack_queue; ; i = prev) {
if (i == qp->s_tail_ack_queue)
old_req = 0;
@@ -1471,7 +1504,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev,
break;
}
qp->r_nak_state = 0;
- tasklet_hi_schedule(&qp->s_task);
+ ipath_schedule_send(qp);
unlock_done:
spin_unlock_irqrestore(&qp->s_lock, flags);
@@ -1503,18 +1536,15 @@ void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err)
static inline void ipath_update_ack_queue(struct ipath_qp *qp, unsigned n)
{
- unsigned long flags;
unsigned next;
next = n + 1;
if (next > IPATH_MAX_RDMA_ATOMIC)
next = 0;
- spin_lock_irqsave(&qp->s_lock, flags);
if (n == qp->s_tail_ack_queue) {
qp->s_tail_ack_queue = next;
qp->s_ack_state = OP(ACKNOWLEDGE);
}
- spin_unlock_irqrestore(&qp->s_lock, flags);
}
/**
@@ -1543,6 +1573,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
int diff;
struct ib_reth *reth;
int header_in_data;
+ unsigned long flags;
/* Validate the SLID. See Ch. 9.6.1.5 */
if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid))
@@ -1690,9 +1721,8 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
goto nack_inv;
ipath_copy_sge(&qp->r_sge, data, tlen);
qp->r_msn++;
- if (!qp->r_wrid_valid)
+ if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags))
break;
- qp->r_wrid_valid = 0;
wc.wr_id = qp->r_wr_id;
wc.status = IB_WC_SUCCESS;
if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) ||
@@ -1764,9 +1794,13 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
next = qp->r_head_ack_queue + 1;
if (next > IPATH_MAX_RDMA_ATOMIC)
next = 0;
+ spin_lock_irqsave(&qp->s_lock, flags);
+ /* Double check we can process this while holding the s_lock. */
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK))
+ goto unlock;
if (unlikely(next == qp->s_tail_ack_queue)) {
if (!qp->s_ack_queue[next].sent)
- goto nack_inv;
+ goto nack_inv_unlck;
ipath_update_ack_queue(qp, next);
}
e = &qp->s_ack_queue[qp->r_head_ack_queue];
@@ -1787,7 +1821,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
ok = ipath_rkey_ok(qp, &e->rdma_sge, len, vaddr,
rkey, IB_ACCESS_REMOTE_READ);
if (unlikely(!ok))
- goto nack_acc;
+ goto nack_acc_unlck;
/*
* Update the next expected PSN. We add 1 later
* below, so only add the remainder here.
@@ -1814,13 +1848,12 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
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);
+ /* Schedule the send tasklet. */
+ ipath_schedule_send(qp);
- goto done;
+ goto unlock;
}
case OP(COMPARE_SWAP):
@@ -1839,9 +1872,13 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
next = qp->r_head_ack_queue + 1;
if (next > IPATH_MAX_RDMA_ATOMIC)
next = 0;
+ spin_lock_irqsave(&qp->s_lock, flags);
+ /* Double check we can process this while holding the s_lock. */
+ if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK))
+ goto unlock;
if (unlikely(next == qp->s_tail_ack_queue)) {
if (!qp->s_ack_queue[next].sent)
- goto nack_inv;
+ goto nack_inv_unlck;
ipath_update_ack_queue(qp, next);
}
if (!header_in_data)
@@ -1851,13 +1888,13 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) |
be32_to_cpu(ateth->vaddr[1]);
if (unlikely(vaddr & (sizeof(u64) - 1)))
- goto nack_inv;
+ goto nack_inv_unlck;
rkey = be32_to_cpu(ateth->rkey);
/* Check rkey & NAK */
if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge,
sizeof(u64), vaddr, rkey,
IB_ACCESS_REMOTE_ATOMIC)))
- goto nack_acc;
+ goto nack_acc_unlck;
/* Perform atomic OP and save result. */
maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
sdata = be64_to_cpu(ateth->swap_data);
@@ -1874,13 +1911,12 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
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);
+ /* Schedule the send tasklet. */
+ ipath_schedule_send(qp);
- goto done;
+ goto unlock;
}
default:
@@ -1901,19 +1937,26 @@ rnr_nak:
qp->r_ack_psn = qp->r_psn;
goto send_ack;
+nack_inv_unlck:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
nack_inv:
ipath_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
qp->r_nak_state = IB_NAK_INVALID_REQUEST;
qp->r_ack_psn = qp->r_psn;
goto send_ack;
+nack_acc_unlck:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
nack_acc:
ipath_rc_error(qp, IB_WC_LOC_PROT_ERR);
qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR;
qp->r_ack_psn = qp->r_psn;
send_ack:
send_rc_ack(qp);
+ goto done;
+unlock:
+ spin_unlock_irqrestore(&qp->s_lock, flags);
done:
return;
}