This patch adds an additional lock to reduce contention on the s_lock.
This lock is used in post_send() so that the post_send is not
serialized with the send engine and other send related processing.
To do this the s_next_psn is now maintained on post_send() while
post_send() related fields are moved to a new cache line. There is
an s_avail maintained for the post_send() to mitigate trading cache
lines with the send engine. The lock is released/acquired around
releasing the just built packet to the egress mechanism.
Reviewed-by: Jubin John <jubin.john@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
}
}
+/**
+ * qib_check_send_wqe - validate wr/wqe
+ * @qp - The qp
+ * @wqe - The built wqe
+ *
+ * validate wr/wqe. This is called
+ * prior to inserting the wqe into
+ * the ring but after the wqe has been
+ * setup.
+ *
+ * Returns 0 on success, -EINVAL on failure
+ */
+int qib_check_send_wqe(struct rvt_qp *qp,
+ struct rvt_swqe *wqe)
+{
+ struct rvt_ah *ah;
+
+ switch (qp->ibqp.qp_type) {
+ case IB_QPT_RC:
+ case IB_QPT_UC:
+ if (wqe->length > 0x80000000U)
+ return -EINVAL;
+ break;
+ case IB_QPT_SMI:
+ case IB_QPT_GSI:
+ case IB_QPT_UD:
+ ah = ibah_to_rvtah(wqe->ud_wr.ah);
+ if (wqe->length > (1 << ah->log_pmtu))
+ return -EINVAL;
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
#ifdef CONFIG_DEBUG_FS
struct qib_qp_iter {
* qib_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
* @qp: a pointer to the QP
*
+ * Assumes the s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int qib_make_rc_req(struct rvt_qp *qp)
u32 bth2;
u32 pmtu = qp->pmtu;
char newreq;
- unsigned long flags;
int ret = 0;
int delta;
if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
ohdr = &priv->s_hdr->u.l.oth;
- /*
- * The lock is needed to synchronize between the sending tasklet,
- * the receive interrupt handler, and timeout resends.
- */
- spin_lock_irqsave(&qp->s_lock, flags);
-
/* Sending responses has higher priority over sending requests. */
if ((qp->s_flags & RVT_S_RESP_PENDING) &&
qib_make_rc_ack(dev, qp, ohdr, pmtu))
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_dma_busy)) {
qp->s_flags |= RVT_S_WAIT_FENCE;
goto bail;
}
- wqe->psn = qp->s_next_psn;
newreq = 1;
+ qp->s_psn = wqe->psn;
}
/*
* Note that we have to be careful not to modify the
qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
goto bail;
}
- wqe->lpsn = wqe->psn;
if (len > pmtu) {
- wqe->lpsn += (len - 1) / pmtu;
qp->s_state = OP(SEND_FIRST);
len = pmtu;
break;
cpu_to_be32(wqe->rdma_wr.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(len);
hwords += sizeof(struct ib_reth) / sizeof(u32);
- wqe->lpsn = wqe->psn;
if (len > pmtu) {
- wqe->lpsn += (len - 1) / pmtu;
qp->s_state = OP(RDMA_WRITE_FIRST);
len = pmtu;
break;
qp->s_num_rd_atomic++;
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
- /*
- * Adjust s_next_psn to count the
- * expected number of responses.
- */
- if (len > pmtu)
- qp->s_next_psn += (len - 1) / pmtu;
- wqe->lpsn = qp->s_next_psn++;
}
ohdr->u.rc.reth.vaddr =
qp->s_num_rd_atomic++;
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
- wqe->lpsn = wqe->psn;
}
if (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
qp->s_state = OP(COMPARE_SWAP);
}
if (wqe->wr.opcode == IB_WR_RDMA_READ)
qp->s_psn = wqe->lpsn + 1;
- else {
+ else
qp->s_psn++;
- if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
- }
break;
case OP(RDMA_READ_RESPONSE_FIRST):
/* FALLTHROUGH */
case OP(SEND_MIDDLE):
bth2 = qp->s_psn++ & QIB_PSN_MASK;
- if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
ss = &qp->s_sge;
len = qp->s_len;
if (len > pmtu) {
/* FALLTHROUGH */
case OP(RDMA_WRITE_MIDDLE):
bth2 = qp->s_psn++ & QIB_PSN_MASK;
- if (qib_cmp24(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
ss = &qp->s_sge;
len = qp->s_len;
if (len > pmtu) {
qp->s_cur_size = len;
qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), bth2);
done:
- ret = 1;
- goto unlock;
-
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
goto ack_done;
/* Ignore invalid responses. */
- if (qib_cmp24(psn, qp->s_next_psn) >= 0)
+ smp_read_barrier_depends(); /* see post_one_send */
+ if (qib_cmp24(psn, ACCESS_ONCE(qp->s_next_psn)) >= 0)
goto ack_done;
/* Ignore duplicate responses. */
sqp->s_flags |= RVT_S_BUSY;
again:
- if (sqp->s_last == sqp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (sqp->s_last == ACCESS_ONCE(sqp->s_head))
goto clr_busy;
wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);
qp->s_flags |= RVT_S_BUSY;
- spin_unlock_irqrestore(&qp->s_lock, flags);
-
do {
/* Check for a constructed packet to be sent. */
if (qp->s_hdrwords != 0) {
+ spin_unlock_irqrestore(&qp->s_lock, flags);
/*
* If the packet cannot be sent now, return and
* the send tasklet will be woken up later.
*/
if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords,
qp->s_cur_sge, qp->s_cur_size))
- break;
+ return;
/* Record that s_hdr is empty. */
qp->s_hdrwords = 0;
+ spin_lock_irqsave(&qp->s_lock, flags);
}
} while (make_req(qp));
+
+ spin_unlock_irqrestore(&qp->s_lock, flags);
}
/*
* qib_make_uc_req - construct a request packet (SEND, RDMA write)
* @qp: a pointer to the QP
*
+ * Assumes the s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int qib_make_uc_req(struct rvt_qp *qp)
struct qib_qp_priv *priv = qp->priv;
struct qib_other_headers *ohdr;
struct rvt_swqe *wqe;
- unsigned long flags;
u32 hwords;
u32 bth0;
u32 len;
u32 pmtu = qp->pmtu;
int ret = 0;
- spin_lock_irqsave(&qp->s_lock, flags);
-
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_dma_busy)) {
RVT_PROCESS_NEXT_SEND_OK))
goto bail;
/* Check if send work queue is empty. */
- if (qp->s_cur == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_cur == ACCESS_ONCE(qp->s_head))
goto bail;
/*
* Start a new request.
*/
- wqe->psn = qp->s_next_psn;
- qp->s_psn = qp->s_next_psn;
+ qp->s_psn = wqe->psn;
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;
qp->s_cur_sge = &qp->s_sge;
qp->s_cur_size = len;
qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
- qp->s_next_psn++ & QIB_PSN_MASK);
+ qp->s_psn++ & QIB_PSN_MASK);
done:
- ret = 1;
- goto unlock;
-
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
* qib_make_ud_req - construct a UD request packet
* @qp: the QP
*
+ * Assumes the s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int qib_make_ud_req(struct rvt_qp *qp)
struct qib_pportdata *ppd;
struct qib_ibport *ibp;
struct rvt_swqe *wqe;
- unsigned long flags;
u32 nwords;
u32 extra_bytes;
u32 bth0;
int ret = 0;
int next_cur;
- spin_lock_irqsave(&qp->s_lock, flags);
-
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_dma_busy)) {
goto done;
}
- if (qp->s_cur == qp->s_head)
+ /* see post_one_send() */
+ smp_read_barrier_depends();
+ if (qp->s_cur == ACCESS_ONCE(qp->s_head))
goto bail;
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
this_cpu_inc(ibp->pmastats->n_unicast_xmit);
lid = ah_attr->dlid & ~((1 << ppd->lmc) - 1);
if (unlikely(lid == ppd->lid)) {
+ unsigned long flags;
/*
* If DMAs are in progress, we can't generate
* a completion for the loopback packet since
goto bail;
}
qp->s_cur = next_cur;
+ local_irq_save(flags);
spin_unlock_irqrestore(&qp->s_lock, flags);
qib_ud_loopback(qp, wqe);
spin_lock_irqsave(&qp->s_lock, flags);
ah_attr->dlid != be16_to_cpu(IB_LID_PERMISSIVE) ?
cpu_to_be32(QIB_MULTICAST_QPN) :
cpu_to_be32(wqe->ud_wr.remote_qpn);
- ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & QIB_PSN_MASK);
+ ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK);
/*
* Qkeys with the high order bit set mean use the
* qkey from the QP context instead of the WR (see 10.2.5).
ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
done:
- ret = 1;
- goto unlock;
-
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
dd->verbs_dev.rdi.driver_f.get_card_name = qib_get_card_name;
dd->verbs_dev.rdi.driver_f.get_pci_dev = qib_get_pci_dev;
dd->verbs_dev.rdi.driver_f.check_ah = qib_check_ah;
+ dd->verbs_dev.rdi.driver_f.check_send_wqe = qib_check_send_wqe;
dd->verbs_dev.rdi.driver_f.notify_new_ah = qib_notify_new_ah;
dd->verbs_dev.rdi.driver_f.alloc_qpn = qib_alloc_qpn;
dd->verbs_dev.rdi.driver_f.qp_priv_alloc = qib_qp_priv_alloc;
dd->verbs_dev.rdi.driver_f.mtu_to_path_mtu = qib_mtu_to_path_mtu;
dd->verbs_dev.rdi.driver_f.mtu_from_qp = qib_mtu_from_qp;
dd->verbs_dev.rdi.driver_f.get_pmtu_from_attr = qib_get_pmtu_from_attr;
+ dd->verbs_dev.rdi.driver_f.schedule_send_no_lock = _qib_schedule_send;
dd->verbs_dev.rdi.driver_f.query_port_state = qib_query_port;
dd->verbs_dev.rdi.driver_f.shut_down_port = qib_shut_down_port;
dd->verbs_dev.rdi.driver_f.cap_mask_chg = qib_cap_mask_chg;
dev->pio_hdrs, dev->pio_hdrs_phys);
}
-/*
- * This must be called with s_lock held.
+/**
+ * _qib_schedule_send - schedule progress
+ * @qp - the qp
+ *
+ * This schedules progress w/o regard to the s_flags.
+ *
+ * It is only used in post send, which doesn't hold
+ * the s_lock.
*/
-void qib_schedule_send(struct rvt_qp *qp)
+void _qib_schedule_send(struct rvt_qp *qp)
{
+ struct qib_ibport *ibp =
+ to_iport(qp->ibqp.device, qp->port_num);
+ struct qib_pportdata *ppd = ppd_from_ibp(ibp);
struct qib_qp_priv *priv = qp->priv;
- if (qib_send_ok(qp)) {
- struct qib_ibport *ibp =
- to_iport(qp->ibqp.device, qp->port_num);
- struct qib_pportdata *ppd = ppd_from_ibp(ibp);
- queue_work(ppd->qib_wq, &priv->s_work);
- }
+ queue_work(ppd->qib_wq, &priv->s_work);
+}
+
+/**
+ * qib_schedule_send - schedule progress
+ * @qp - the qp
+ *
+ * This schedules qp progress. The s_lock
+ * should be held.
+ */
+void qib_schedule_send(struct rvt_qp *qp)
+{
+ if (qib_send_ok(qp))
+ _qib_schedule_send(qp);
}
!(qp->s_flags & RVT_S_ANY_WAIT_SEND));
}
-/*
- * This must be called with s_lock held.
- */
+void _qib_schedule_send(struct rvt_qp *qp);
void qib_schedule_send(struct rvt_qp *qp);
static inline int qib_pkey_ok(u16 pkey1, u16 pkey2)
int qib_check_ah(struct ib_device *ibdev, struct ib_ah_attr *ah_attr);
+int qib_check_send_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe);
+
struct ib_ah *qib_create_qp0_ah(struct qib_ibport *ibp, u16 dlid);
void qib_rc_rnr_retry(unsigned long arg);
rdi->driver_f.flush_qp_waiters(qp);
qp->s_flags &= ~(RVT_S_TIMER | RVT_S_ANY_WAIT);
spin_unlock(&qp->s_lock);
+ spin_unlock(&qp->s_hlock);
spin_unlock_irq(&qp->r_lock);
/* Stop the send queue and the retry timer */
/* grab the lock b/c it was locked at call time */
spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_hlock);
spin_lock(&qp->s_lock);
rvt_clear_mr_refs(qp, 1);
* except for qp->ibqp.qp_num.
*/
spin_lock_init(&qp->r_lock);
+ spin_lock_init(&qp->s_hlock);
spin_lock_init(&qp->s_lock);
spin_lock_init(&qp->r_rq.lock);
atomic_set(&qp->refcount, 0);
qp->state = IB_QPS_RESET;
qp->s_wq = swq;
qp->s_size = init_attr->cap.max_send_wr + 1;
+ qp->s_avail = init_attr->cap.max_send_wr;
qp->s_max_sge = init_attr->cap.max_send_sge;
if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
qp->s_flags = RVT_S_SIGNAL_REQ_WR;
wqe->ud_wr.ah)->refcount);
if (++qp->s_last >= qp->s_size)
qp->s_last = 0;
+ smp_wmb(); /* see qp_set_savail */
}
if (qp->s_rdma_mr) {
rvt_put_mr(qp->s_rdma_mr);
rdi->driver_f.notify_error_qp(qp);
/* Schedule the sending tasklet to drain the send work queue. */
- if (qp->s_last != qp->s_head)
+ if (ACCESS_ONCE(qp->s_last) != qp->s_head)
rdi->driver_f.schedule_send(qp);
rvt_clear_mr_refs(qp, 0);
link = rdma_port_get_link_layer(ibqp->device, qp->port_num);
spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_hlock);
spin_lock(&qp->s_lock);
cur_state = attr_mask & IB_QP_CUR_STATE ?
if (attr_mask & IB_QP_PATH_MTU) {
qp->pmtu = rdi->driver_f.mtu_from_qp(rdi, qp, pmtu);
qp->path_mtu = rdi->driver_f.mtu_to_path_mtu(qp->pmtu);
+ qp->log_pmtu = ilog2(qp->pmtu);
}
if (attr_mask & IB_QP_RETRY_CNT) {
rdi->driver_f.modify_qp(qp, attr, attr_mask, udata);
spin_unlock(&qp->s_lock);
+ spin_unlock(&qp->s_hlock);
spin_unlock_irq(&qp->r_lock);
if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
inval:
spin_unlock(&qp->s_lock);
+ spin_unlock(&qp->s_hlock);
spin_unlock_irq(&qp->r_lock);
return -EINVAL;
}
struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device);
spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_hlock);
spin_lock(&qp->s_lock);
rvt_reset_qp(rdi, qp, ibqp->qp_type);
spin_unlock(&qp->s_lock);
+ spin_unlock(&qp->s_hlock);
spin_unlock_irq(&qp->r_lock);
/* qpn is now available for use again */
return 0;
}
+/**
+ * qp_get_savail - return number of avail send entries
+ *
+ * @qp - the qp
+ *
+ * This assumes the s_hlock is held but the s_last
+ * qp variable is uncontrolled.
+ */
+static inline u32 qp_get_savail(struct rvt_qp *qp)
+{
+ u32 slast;
+ u32 ret;
+
+ smp_read_barrier_depends(); /* see rc.c */
+ slast = ACCESS_ONCE(qp->s_last);
+ if (qp->s_head >= slast)
+ ret = qp->s_size - (qp->s_head - slast);
+ else
+ ret = slast - qp->s_head;
+ return ret - 1;
+}
+
/**
* rvt_post_one_wr - post one RC, UC, or UD send work request
* @qp: the QP to post on
struct rvt_lkey_table *rkt;
struct rvt_pd *pd;
struct rvt_dev_info *rdi = ib_to_rvt(qp->ibqp.device);
+ u8 log_pmtu;
+ int ret;
/* IB spec says that num_sge == 0 is OK. */
if (unlikely(wr->num_sge > qp->s_max_sge))
} else if (wr->opcode >= IB_WR_RDMA_READ && !qp->s_max_rd_atomic) {
return -EINVAL;
}
-
+ /* check for avail */
+ if (unlikely(!qp->s_avail)) {
+ qp->s_avail = qp_get_savail(qp);
+ WARN_ON(qp->s_avail > (qp->s_size - 1));
+ if (!qp->s_avail)
+ return -ENOMEM;
+ }
next = qp->s_head + 1;
if (next >= qp->s_size)
next = 0;
- if (next == qp->s_last)
- return -ENOMEM;
-
- if (rdi->driver_f.check_send_wr &&
- rdi->driver_f.check_send_wr(qp, wr))
- return -EINVAL;
rkt = &rdi->lkey_table;
pd = ibpd_to_rvtpd(qp->ibqp.pd);
continue;
ok = rvt_lkey_ok(rkt, pd, &wqe->sg_list[j],
&wr->sg_list[i], acc);
- if (!ok)
+ if (!ok) {
+ ret = -EINVAL;
goto bail_inval_free;
+ }
wqe->length += length;
j++;
}
wqe->wr.num_sge = j;
}
- if (qp->ibqp.qp_type == IB_QPT_UC ||
- qp->ibqp.qp_type == IB_QPT_RC) {
- if (wqe->length > 0x80000000U)
+
+ /* general part of wqe valid - allow for driver checks */
+ if (rdi->driver_f.check_send_wqe) {
+ ret = rdi->driver_f.check_send_wqe(qp, wqe);
+ if (ret)
goto bail_inval_free;
- } else {
+ }
+
+ log_pmtu = qp->log_pmtu;
+ if (qp->ibqp.qp_type != IB_QPT_UC &&
+ qp->ibqp.qp_type != IB_QPT_RC) {
+ struct rvt_ah *ah = ibah_to_rvtah(wqe->ud_wr.ah);
+
+ log_pmtu = ah->log_pmtu;
atomic_inc(&ibah_to_rvtah(ud_wr(wr)->ah)->refcount);
}
+
wqe->ssn = qp->s_ssn++;
+ wqe->psn = qp->s_next_psn;
+ wqe->lpsn = wqe->psn +
+ (wqe->length ? ((wqe->length - 1) >> log_pmtu) : 0);
+ qp->s_next_psn = wqe->lpsn + 1;
+ smp_wmb(); /* see request builders */
+ qp->s_avail--;
qp->s_head = next;
return 0;
rvt_put_mr(sge->mr);
}
- return -EINVAL;
+ return ret;
}
/**
unsigned nreq = 0;
int err = 0;
- spin_lock_irqsave(&qp->s_lock, flags);
+ spin_lock_irqsave(&qp->s_hlock, flags);
/*
* Ensure QP state is such that we can send. If not bail out early,
* there is no need to do this every time we post a send.
*/
if (unlikely(!(ib_rvt_state_ops[qp->state] & RVT_POST_SEND_OK))) {
- spin_unlock_irqrestore(&qp->s_lock, flags);
+ spin_unlock_irqrestore(&qp->s_hlock, flags);
return -EINVAL;
}
nreq++;
}
bail:
- if (nreq && !call_send)
- rdi->driver_f.schedule_send(qp);
- spin_unlock_irqrestore(&qp->s_lock, flags);
- if (nreq && call_send)
- rdi->driver_f.do_send(qp);
+ spin_unlock_irqrestore(&qp->s_hlock, flags);
+ if (nreq) {
+ if (call_send)
+ rdi->driver_f.schedule_send_no_lock(qp);
+ else
+ rdi->driver_f.do_send(qp);
+ }
return err;
}
}
}
-int hfi1_check_send_wr(struct rvt_qp *qp, struct ib_send_wr *wr)
+/**
+ * hfi1_check_send_wqe - validate wqe
+ * @qp - The qp
+ * @wqe - The built wqe
+ *
+ * validate wqe. This is called
+ * prior to inserting the wqe into
+ * the ring but after the wqe has been
+ * setup.
+ *
+ * Returns 0 on success, -EINVAL on failure
+ *
+ */
+int hfi1_check_send_wqe(struct rvt_qp *qp,
+ struct rvt_swqe *wqe)
{
struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
- struct rvt_ah *ah = ibah_to_rvtah(ud_wr(wr)->ah);
+ struct rvt_ah *ah;
- if (qp->ibqp.qp_type != IB_QPT_RC &&
- qp->ibqp.qp_type != IB_QPT_UC &&
- qp->ibqp.qp_type != IB_QPT_SMI &&
- ibp->sl_to_sc[ah->attr.sl] == 0xf) {
- return -EINVAL;
+ switch (qp->ibqp.qp_type) {
+ case IB_QPT_RC:
+ case IB_QPT_UC:
+ if (wqe->length > 0x80000000U)
+ return -EINVAL;
+ break;
+ case IB_QPT_SMI:
+ ah = ibah_to_rvtah(wqe->ud_wr.ah);
+ if (wqe->length > (1 << ah->log_pmtu))
+ return -EINVAL;
+ break;
+ case IB_QPT_GSI:
+ case IB_QPT_UD:
+ ah = ibah_to_rvtah(wqe->ud_wr.ah);
+ if (wqe->length > (1 << ah->log_pmtu))
+ return -EINVAL;
+ if (ibp->sl_to_sc[ah->attr.sl] == 0xf)
+ return -EINVAL;
+ default:
+ break;
}
return 0;
}
return cpu_to_be32(aeth);
}
+/**
+ * _hfi1_schedule_send - schedule progress
+ * @qp: the QP
+ *
+ * This schedules qp progress w/o regard to the s_flags.
+ *
+ * It is only used in the post send, which doesn't hold
+ * the s_lock.
+ */
+void _hfi1_schedule_send(struct rvt_qp *qp)
+{
+ struct hfi1_qp_priv *priv = qp->priv;
+ struct hfi1_ibport *ibp =
+ to_iport(qp->ibqp.device, qp->port_num);
+ struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+ struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
+
+ iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
+ priv->s_sde ?
+ priv->s_sde->cpu :
+ cpumask_first(cpumask_of_node(dd->node)));
+}
+
+/**
+ * hfi1_schedule_send - schedule progress
+ * @qp: the QP
+ *
+ * This schedules qp progress and caller should hold
+ * the s_lock.
+ */
+void hfi1_schedule_send(struct rvt_qp *qp)
+{
+ if (hfi1_send_ok(qp))
+ _hfi1_schedule_send(qp);
+}
+
/**
* hfi1_get_credit - flush the send work queue of a QP
* @qp: the qp who's send work queue to flush
*/
void qp_comm_est(struct rvt_qp *qp);
-/**
- * _hfi1_schedule_send - schedule progress
- * @qp: the QP
- *
- * This schedules qp progress w/o regard to the s_flags.
- *
- * It is only used in the post send, which doesn't hold
- * the s_lock.
- */
-static inline void _hfi1_schedule_send(struct rvt_qp *qp)
-{
- struct hfi1_qp_priv *priv = qp->priv;
- struct hfi1_ibport *ibp =
- to_iport(qp->ibqp.device, qp->port_num);
- struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
- struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
-
- iowait_schedule(&priv->s_iowait, ppd->hfi1_wq,
- priv->s_sde ?
- priv->s_sde->cpu :
- cpumask_first(cpumask_of_node(dd->node)));
-}
-
-/**
- * hfi1_schedule_send - schedule progress
- * @qp: the QP
- *
- * This schedules qp progress and caller should hold
- * the s_lock.
- */
-static inline void hfi1_schedule_send(struct rvt_qp *qp)
-{
- if (hfi1_send_ok(qp))
- _hfi1_schedule_send(qp);
-}
+void _hfi1_schedule_send(struct rvt_qp *qp);
+void hfi1_schedule_send(struct rvt_qp *qp);
void hfi1_migrate_qp(struct rvt_qp *qp);
* hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC)
* @qp: a pointer to the QP
*
+ * Assumes s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int hfi1_make_rc_req(struct rvt_qp *qp)
u32 bth2;
u32 pmtu = qp->pmtu;
char newreq;
- unsigned long flags;
int ret = 0;
int middle = 0;
int delta;
if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
ohdr = &priv->s_hdr->ibh.u.l.oth;
- /*
- * The lock is needed to synchronize between the sending tasklet,
- * the receive interrupt handler, and timeout re-sends.
- */
- spin_lock_irqsave(&qp->s_lock, flags);
-
/* Sending responses has higher priority over sending requests. */
if ((qp->s_flags & RVT_S_RESP_PENDING) &&
make_rc_ack(dev, qp, ohdr, pmtu))
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_iowait.sdma_busy)) {
qp->s_flags |= RVT_S_WAIT_FENCE;
goto bail;
}
- wqe->psn = qp->s_next_psn;
newreq = 1;
+ qp->s_psn = wqe->psn;
}
/*
* Note that we have to be careful not to modify the
qp->s_flags |= RVT_S_WAIT_SSN_CREDIT;
goto bail;
}
- wqe->lpsn = wqe->psn;
if (len > pmtu) {
- wqe->lpsn += (len - 1) / pmtu;
qp->s_state = OP(SEND_FIRST);
len = pmtu;
break;
cpu_to_be32(wqe->rdma_wr.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(len);
hwords += sizeof(struct ib_reth) / sizeof(u32);
- wqe->lpsn = wqe->psn;
if (len > pmtu) {
- wqe->lpsn += (len - 1) / pmtu;
qp->s_state = OP(RDMA_WRITE_FIRST);
len = pmtu;
break;
qp->s_num_rd_atomic++;
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
- /*
- * Adjust s_next_psn to count the
- * expected number of responses.
- */
- if (len > pmtu)
- qp->s_next_psn += (len - 1) / pmtu;
- wqe->lpsn = qp->s_next_psn++;
}
ohdr->u.rc.reth.vaddr =
cpu_to_be64(wqe->rdma_wr.remote_addr);
qp->s_num_rd_atomic++;
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
- wqe->lpsn = wqe->psn;
}
if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
qp->s_state = OP(COMPARE_SWAP);
}
if (wqe->wr.opcode == IB_WR_RDMA_READ)
qp->s_psn = wqe->lpsn + 1;
- else {
+ else
qp->s_psn++;
- if (cmp_psn(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
- }
break;
case OP(RDMA_READ_RESPONSE_FIRST):
/* FALLTHROUGH */
case OP(SEND_MIDDLE):
bth2 = mask_psn(qp->s_psn++);
- if (cmp_psn(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
ss = &qp->s_sge;
len = qp->s_len;
if (len > pmtu) {
/* FALLTHROUGH */
case OP(RDMA_WRITE_MIDDLE):
bth2 = mask_psn(qp->s_psn++);
- if (cmp_psn(qp->s_psn, qp->s_next_psn) > 0)
- qp->s_next_psn = qp->s_psn;
ss = &qp->s_sge;
len = qp->s_len;
if (len > pmtu) {
bth2,
middle);
done:
- ret = 1;
- goto unlock;
-
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
trace_hfi1_rc_ack(qp, psn);
/* Ignore invalid responses. */
- if (cmp_psn(psn, qp->s_next_psn) >= 0)
+ smp_read_barrier_depends(); /* see post_one_send */
+ if (cmp_psn(psn, ACCESS_ONCE(qp->s_next_psn)) >= 0)
goto ack_done;
/* Ignore duplicate responses. */
sqp->s_flags |= RVT_S_BUSY;
again:
- if (sqp->s_last == sqp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (sqp->s_last == ACCESS_ONCE(sqp->s_head))
goto clr_busy;
wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);
qp->s_flags |= RVT_S_BUSY;
- spin_unlock_irqrestore(&qp->s_lock, flags);
-
timeout = jiffies + (timeout_int) / 8;
cpu = priv->s_sde ? priv->s_sde->cpu :
cpumask_first(cpumask_of_node(ps.ppd->dd->node));
do {
/* Check for a constructed packet to be sent. */
if (qp->s_hdrwords != 0) {
+ spin_unlock_irqrestore(&qp->s_lock, flags);
/*
* If the packet cannot be sent now, return and
* the send tasklet will be woken up later.
*/
if (hfi1_verbs_send(qp, &ps))
- break;
+ return;
/* Record that s_hdr is empty. */
qp->s_hdrwords = 0;
- }
-
- /* allow other tasks to run */
- if (unlikely(time_after(jiffies, timeout))) {
- if (workqueue_congested(cpu, ps.ppd->hfi1_wq)) {
- spin_lock_irqsave(&qp->s_lock, flags);
- qp->s_flags &= ~RVT_S_BUSY;
- hfi1_schedule_send(qp);
- spin_unlock_irqrestore(&qp->s_lock,
- flags);
+ /* allow other tasks to run */
+ if (unlikely(time_after(jiffies, timeout))) {
+ if (workqueue_congested(cpu,
+ ps.ppd->hfi1_wq)) {
+ spin_lock_irqsave(&qp->s_lock, flags);
+ qp->s_flags &= ~RVT_S_BUSY;
+ hfi1_schedule_send(qp);
+ spin_unlock_irqrestore(&qp->s_lock,
+ flags);
+ this_cpu_inc(
+ *ps.ppd->dd->send_schedule);
+ return;
+ }
+ cond_resched();
this_cpu_inc(*ps.ppd->dd->send_schedule);
- return;
+ timeout = jiffies + (timeout_int) / 8;
}
- cond_resched();
- this_cpu_inc(*ps.ppd->dd->send_schedule);
- timeout = jiffies + (timeout_int) / 8;
+ spin_lock_irqsave(&qp->s_lock, flags);
}
} while (make_req(qp));
+
+ spin_unlock_irqrestore(&qp->s_lock, flags);
}
/*
* hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
* @qp: a pointer to the QP
*
+ * Assume s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int hfi1_make_uc_req(struct rvt_qp *qp)
struct hfi1_qp_priv *priv = qp->priv;
struct hfi1_other_headers *ohdr;
struct rvt_swqe *wqe;
- unsigned long flags;
u32 hwords = 5;
u32 bth0 = 0;
u32 len;
int ret = 0;
int middle = 0;
- spin_lock_irqsave(&qp->s_lock, flags);
-
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_iowait.sdma_busy)) {
RVT_PROCESS_NEXT_SEND_OK))
goto bail;
/* Check if send work queue is empty. */
- if (qp->s_cur == qp->s_head) {
+ smp_read_barrier_depends(); /* see post_one_send() */
+ if (qp->s_cur == ACCESS_ONCE(qp->s_head)) {
clear_ahg(qp);
goto bail;
}
/*
* Start a new request.
*/
- wqe->psn = qp->s_next_psn;
- qp->s_psn = qp->s_next_psn;
+ qp->s_psn = wqe->psn;
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;
qp->s_cur_sge = &qp->s_sge;
qp->s_cur_size = len;
hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
- mask_psn(qp->s_next_psn++), middle);
+ mask_psn(qp->s_psn++), middle);
done:
- ret = 1;
- goto unlock;
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
* hfi1_make_ud_req - construct a UD request packet
* @qp: the QP
*
+ * Assume s_lock is held.
+ *
* Return 1 if constructed; otherwise, return 0.
*/
int hfi1_make_ud_req(struct rvt_qp *qp)
struct hfi1_pportdata *ppd;
struct hfi1_ibport *ibp;
struct rvt_swqe *wqe;
- unsigned long flags;
u32 nwords;
u32 extra_bytes;
u32 bth0;
int next_cur;
u8 sc5;
- spin_lock_irqsave(&qp->s_lock, flags);
-
if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
goto bail;
/* We are in the error state, flush the work request. */
- if (qp->s_last == qp->s_head)
+ smp_read_barrier_depends(); /* see post_one_send */
+ if (qp->s_last == ACCESS_ONCE(qp->s_head))
goto bail;
/* If DMAs are in progress, we can't flush immediately. */
if (atomic_read(&priv->s_iowait.sdma_busy)) {
goto done;
}
- if (qp->s_cur == qp->s_head)
+ /* see post_one_send() */
+ smp_read_barrier_depends();
+ if (qp->s_cur == ACCESS_ONCE(qp->s_head))
goto bail;
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
if (unlikely(!loopback && (lid == ppd->lid ||
(lid == be16_to_cpu(IB_LID_PERMISSIVE) &&
qp->ibqp.qp_type == IB_QPT_GSI)))) {
+ unsigned long flags;
/*
* If DMAs are in progress, we can't generate
* a completion for the loopback packet since
goto bail;
}
qp->s_cur = next_cur;
+ local_irq_save(flags);
spin_unlock_irqrestore(&qp->s_lock, flags);
ud_loopback(qp, wqe);
spin_lock_irqsave(&qp->s_lock, flags);
bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index);
ohdr->bth[0] = cpu_to_be32(bth0);
ohdr->bth[1] = cpu_to_be32(wqe->ud_wr.remote_qpn);
- ohdr->bth[2] = cpu_to_be32(mask_psn(qp->s_next_psn++));
+ ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
/*
* Qkeys with the high order bit set mean use the
* qkey from the QP context instead of the WR (see 10.2.5).
priv->s_hdr->sde = NULL;
done:
- ret = 1;
- goto unlock;
-
+ return 1;
bail:
qp->s_flags &= ~RVT_S_BUSY;
-unlock:
- spin_unlock_irqrestore(&qp->s_lock, flags);
return ret;
}
dd->verbs_dev.rdi.driver_f.notify_qp_reset = notify_qp_reset;
dd->verbs_dev.rdi.driver_f.do_send = hfi1_do_send;
dd->verbs_dev.rdi.driver_f.schedule_send = hfi1_schedule_send;
+ dd->verbs_dev.rdi.driver_f.schedule_send_no_lock = _hfi1_schedule_send;
dd->verbs_dev.rdi.driver_f.get_pmtu_from_attr = get_pmtu_from_attr;
dd->verbs_dev.rdi.driver_f.notify_error_qp = notify_error_qp;
dd->verbs_dev.rdi.driver_f.flush_qp_waiters = flush_qp_waiters;
dd->verbs_dev.rdi.driver_f.mtu_to_path_mtu = mtu_to_path_mtu;
dd->verbs_dev.rdi.driver_f.check_modify_qp = hfi1_check_modify_qp;
dd->verbs_dev.rdi.driver_f.modify_qp = hfi1_modify_qp;
- dd->verbs_dev.rdi.driver_f.check_send_wr = hfi1_check_send_wr;
+ dd->verbs_dev.rdi.driver_f.check_send_wqe = hfi1_check_send_wqe;
/* completeion queue */
snprintf(dd->verbs_dev.rdi.dparms.cq_name,
void hfi1_modify_qp(struct rvt_qp *qp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata);
-int hfi1_check_send_wr(struct rvt_qp *qp, struct ib_send_wr *wr);
+int hfi1_check_send_wqe(struct rvt_qp *qp, struct rvt_swqe *wqe);
int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_ib_header *hdr,
int has_grh, struct rvt_qp *qp, u32 bth0);
};
struct rvt_dev_info;
+struct rvt_swqe;
struct rvt_driver_provided {
/*
* The work to create port files in /sys/class Infiniband is different
void (*qp_priv_free)(struct rvt_dev_info *rdi, struct rvt_qp *qp);
void (*notify_qp_reset)(struct rvt_qp *qp);
void (*schedule_send)(struct rvt_qp *qp);
+ void (*schedule_send_no_lock)(struct rvt_qp *qp);
void (*do_send)(struct rvt_qp *qp);
int (*get_pmtu_from_attr)(struct rvt_dev_info *rdi, struct rvt_qp *qp,
struct ib_qp_attr *attr);
void (*modify_qp)(struct rvt_qp *qp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata);
- int (*check_send_wr)(struct rvt_qp *qp, struct ib_send_wr *wr);
+ int (*check_send_wqe)(struct rvt_qp *qp, struct rvt_swqe *wqe);
void (*notify_create_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
void (*notify_free_mad_agent)(struct rvt_dev_info *rdi, int port_idx);
enum ib_mtu path_mtu;
int srate_mbps; /* s_srate (below) converted to Mbit/s */
u32 remote_qpn;
- u32 pmtu; /* decoded from path_mtu */
u32 qkey; /* QKEY for this QP (for UD or RD) */
u32 s_size; /* send work queue size */
u32 s_ahgpsn; /* set to the psn in the copy of the header */
+ u16 pmtu; /* decoded from path_mtu */
+ u8 log_pmtu; /* shift for pmtu */
u8 state; /* QP state */
u8 allowed_ops; /* high order bits of allowed opcodes */
u8 qp_access_flags;
struct rvt_sge_state r_sge; /* current receive data */
struct rvt_rq r_rq; /* receive work queue */
+ /* post send line */
+ spinlock_t s_hlock ____cacheline_aligned_in_smp;
+ u32 s_head; /* new entries added here */
+ u32 s_next_psn; /* PSN for next request */
+ u32 s_avail; /* number of entries avail */
+ u32 s_ssn; /* SSN of tail entry */
+
spinlock_t s_lock ____cacheline_aligned_in_smp;
struct rvt_sge_state *s_cur_sge;
u32 s_flags;
u32 s_cur_size; /* size of send packet in bytes */
u32 s_len; /* total length of s_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_sending_psn; /* lowest PSN that is being sent */
u32 s_sending_hpsn; /* highest PSN that is being sent */
u32 s_psn; /* current packet sequence number */
u32 s_ack_rdma_psn; /* PSN for sending RDMA read responses */
u32 s_ack_psn; /* PSN for acking sends and RDMA writes */
- u32 s_head; /* new entries added here */
u32 s_tail; /* next entry to process */
u32 s_cur; /* current work queue entry */
u32 s_acked; /* last un-ACK'ed entry */
u32 s_last; /* last completed entry */
- u32 s_ssn; /* SSN of tail entry */
u32 s_lsn; /* limit sequence number (credit) */
u16 s_hdrwords; /* size of s_hdr in 32 bit words */
u16 s_rdma_ack_cnt;
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff