GIT b795b25db6463a282c13d4f3170140a837da711e git+ssh://master.kernel.org/pub/scm/linux/kernel/git/roland/infiniband.git#for-mm commit Author: Roland Dreier Date: Sun Mar 25 19:30:42 2007 -0700 IPoIB: Convert to NAPI Convert the IP-over-InfiniBand network device driver over to using NAPI to handle all completions (both receive and send). Signed-off-by: Roland Dreier commit 07645a8673fa87ff04220d44dc843f0c5a477af9 Author: Roland Dreier Date: Sun Mar 25 19:30:41 2007 -0700 IB: Return "maybe missed event" hint from ib_req_notify_cq() The semantics defined by the InfiniBand specification say that completion events are only generated when a completions is added to a completion queue (CQ) after completion notification is requested. In other words, this means that the following race is possible: while (CQ is not empty) ib_poll_cq(CQ); // new completion is added after while loop is exited ib_req_notify_cq(CQ); // no event is generated for the existing completion To close this race, the IB spec recommends doing another poll of the CQ after requesting notification. However, it is not always possible to arrange code this way (for example, we have found that NAPI for IPoIB cannot poll after requesting notification). Also, some hardware (eg Mellanox HCAs) actually will generate an event for completions added before the call to ib_req_notify_cq() -- which is allowed by the spec, since there's no way for any upper-layer consumer to know exactly when a completion was really added -- so the extra poll of the CQ is just a waste. Motivated by this, we add a new flag "IB_CQ_REPORT_MISSED_EVENTS" for ib_req_notify_cq() so that it can return a hint about whether the a completion may have been added before the request for notification. The return value of ib_req_notify_cq() is extended so: < 0 means an error occurred while requesting notification == 0 means notification was requested successfully, and if IB_CQ_REPORT_MISSED_EVENTS was passed in, then no events were missed and it is safe to wait for another event. > 0 is only returned if IB_CQ_REPORT_MISSED_EVENTS was passed in. It means that the consumer must poll the CQ again to make sure it is empty to avoid the race described above. We add a flag to enable this behavior rather than turning it on uncondiationally, because checking for missed events may incur significant overhead for some low-level drivers, and consumers that don't care about the results of this test shouldn't be forced to pay for the test. Signed-off-by: Roland Dreier drivers/infiniband/hw/amso1100/c2.h | 2 - drivers/infiniband/hw/amso1100/c2_cq.c | 16 ++++- drivers/infiniband/hw/cxgb3/iwch_provider.c | 4 + drivers/infiniband/hw/ehca/ehca_iverbs.h | 2 - drivers/infiniband/hw/ehca/ehca_reqs.c | 14 +++- drivers/infiniband/hw/ehca/ipz_pt_fn.h | 8 ++ drivers/infiniband/hw/ipath/ipath_cq.c | 15 +++-- drivers/infiniband/hw/ipath/ipath_verbs.h | 2 - drivers/infiniband/hw/mthca/mthca_cq.c | 12 ++-- drivers/infiniband/hw/mthca/mthca_dev.h | 4 + drivers/infiniband/ulp/ipoib/ipoib.h | 1 drivers/infiniband/ulp/ipoib/ipoib_cm.c | 2 - drivers/infiniband/ulp/ipoib/ipoib_ib.c | 88 +++++++++++++++++++++------ drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 + include/rdma/ib_verbs.h | 40 ++++++++++-- 15 files changed, 160 insertions(+), 52 deletions(-) diff --git a/drivers/infiniband/hw/amso1100/c2.h b/drivers/infiniband/hw/amso1100/c2.h index 04a9db5..fa58200 100644 --- a/drivers/infiniband/hw/amso1100/c2.h +++ b/drivers/infiniband/hw/amso1100/c2.h @@ -519,7 +519,7 @@ extern void c2_free_cq(struct c2_dev *c2 extern void c2_cq_event(struct c2_dev *c2dev, u32 mq_index); extern void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index); extern int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry); -extern int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify); +extern int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags); /* CM */ extern int c2_llp_connect(struct iw_cm_id *cm_id, diff --git a/drivers/infiniband/hw/amso1100/c2_cq.c b/drivers/infiniband/hw/amso1100/c2_cq.c index 5175c99..d2b3366 100644 --- a/drivers/infiniband/hw/amso1100/c2_cq.c +++ b/drivers/infiniband/hw/amso1100/c2_cq.c @@ -217,17 +217,19 @@ int c2_poll_cq(struct ib_cq *ibcq, int n return npolled; } -int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify) +int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags) { struct c2_mq_shared __iomem *shared; struct c2_cq *cq; + unsigned long flags; + int ret = 0; cq = to_c2cq(ibcq); shared = cq->mq.peer; - if (notify == IB_CQ_NEXT_COMP) + if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP) writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type); - else if (notify == IB_CQ_SOLICITED) + else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED) writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type); else return -EINVAL; @@ -241,7 +243,13 @@ int c2_arm_cq(struct ib_cq *ibcq, enum i */ readb(&shared->armed); - return 0; + if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) { + spin_lock_irqsave(&cq->lock, flags); + ret = !c2_mq_empty(&cq->mq); + spin_unlock_irqrestore(&cq->lock, flags); + } + + return ret; } static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq) diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c index 24e0df0..013299c 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_provider.c +++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c @@ -292,7 +292,7 @@ #else #endif } -static int iwch_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify) +static int iwch_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) { struct iwch_dev *rhp; struct iwch_cq *chp; @@ -303,7 +303,7 @@ static int iwch_arm_cq(struct ib_cq *ibc chp = to_iwch_cq(ibcq); rhp = chp->rhp; - if (notify == IB_CQ_SOLICITED) + if ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED) cq_op = CQ_ARM_SE; else cq_op = CQ_ARM_AN; diff --git a/drivers/infiniband/hw/ehca/ehca_iverbs.h b/drivers/infiniband/hw/ehca/ehca_iverbs.h index 95fd59f..9e5460d 100644 --- a/drivers/infiniband/hw/ehca/ehca_iverbs.h +++ b/drivers/infiniband/hw/ehca/ehca_iverbs.h @@ -135,7 +135,7 @@ int ehca_poll_cq(struct ib_cq *cq, int n int ehca_peek_cq(struct ib_cq *cq, int wc_cnt); -int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify cq_notify); +int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags); struct ib_qp *ehca_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *init_attr, diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c index 08d3f89..caec9de 100644 --- a/drivers/infiniband/hw/ehca/ehca_reqs.c +++ b/drivers/infiniband/hw/ehca/ehca_reqs.c @@ -634,11 +634,13 @@ poll_cq_exit0: return ret; } -int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify cq_notify) +int ehca_req_notify_cq(struct ib_cq *cq, enum ib_cq_notify_flags notify_flags) { struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq); + unsigned long spl_flags; + int ret = 0; - switch (cq_notify) { + switch (notify_flags & IB_CQ_SOLICITED_MASK) { case IB_CQ_SOLICITED: hipz_set_cqx_n0(my_cq, 1); break; @@ -649,5 +651,11 @@ int ehca_req_notify_cq(struct ib_cq *cq, return -EINVAL; } - return 0; + if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) { + spin_lock_irqsave(&my_cq->spinlock, spl_flags); + ret = ipz_qeit_is_valid(&my_cq->ipz_queue); + spin_unlock_irqrestore(&my_cq->spinlock, spl_flags); + } + + return ret; } diff --git a/drivers/infiniband/hw/ehca/ipz_pt_fn.h b/drivers/infiniband/hw/ehca/ipz_pt_fn.h index 8199c45..57f141a 100644 --- a/drivers/infiniband/hw/ehca/ipz_pt_fn.h +++ b/drivers/infiniband/hw/ehca/ipz_pt_fn.h @@ -140,6 +140,14 @@ static inline void *ipz_qeit_get_inc_val return cqe; } +static inline int ipz_qeit_is_valid(struct ipz_queue *queue) +{ + struct ehca_cqe *cqe = ipz_qeit_get(queue); + u32 cqe_flags = cqe->cqe_flags; + + return cqe_flags >> 7 == (queue->toggle_state & 1); +} + /* * returns and resets Queue Entry iterator * returns address (kv) of first Queue Entry diff --git a/drivers/infiniband/hw/ipath/ipath_cq.c b/drivers/infiniband/hw/ipath/ipath_cq.c index 87462e0..9582145 100644 --- a/drivers/infiniband/hw/ipath/ipath_cq.c +++ b/drivers/infiniband/hw/ipath/ipath_cq.c @@ -306,17 +306,18 @@ int ipath_destroy_cq(struct ib_cq *ibcq) /** * ipath_req_notify_cq - change the notification type for a completion queue * @ibcq: the completion queue - * @notify: the type of notification to request + * @notify_flags: the type of notification to request * * Returns 0 for success. * * This may be called from interrupt context. Also called by * ib_req_notify_cq() in the generic verbs code. */ -int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify notify) +int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags) { struct ipath_cq *cq = to_icq(ibcq); unsigned long flags; + int ret = 0; spin_lock_irqsave(&cq->lock, flags); /* @@ -324,9 +325,15 @@ int ipath_req_notify_cq(struct ib_cq *ib * any other transitions (see C11-31 and C11-32 in ch. 11.4.2.2). */ if (cq->notify != IB_CQ_NEXT_COMP) - cq->notify = notify; + cq->notify = notify_flags & IB_CQ_SOLICITED_MASK; + + if ((notify_flags & IB_CQ_REPORT_MISSED_EVENTS) && + cq->queue->head != cq->queue->tail) + ret = 1; + spin_unlock_irqrestore(&cq->lock, flags); - return 0; + + return ret; } /** diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.h b/drivers/infiniband/hw/ipath/ipath_verbs.h index c0c8d5b..6b3b770 100644 --- a/drivers/infiniband/hw/ipath/ipath_verbs.h +++ b/drivers/infiniband/hw/ipath/ipath_verbs.h @@ -716,7 +716,7 @@ struct ib_cq *ipath_create_cq(struct ib_ int ipath_destroy_cq(struct ib_cq *ibcq); -int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify notify); +int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags); int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata); diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c index efd79ef..fff138f 100644 --- a/drivers/infiniband/hw/mthca/mthca_cq.c +++ b/drivers/infiniband/hw/mthca/mthca_cq.c @@ -726,11 +726,12 @@ repoll: return err == 0 || err == -EAGAIN ? npolled : err; } -int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify notify) +int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags) { __be32 doorbell[2]; - doorbell[0] = cpu_to_be32((notify == IB_CQ_SOLICITED ? + doorbell[0] = cpu_to_be32(((flags & IB_CQ_SOLICITED_MASK) == + IB_CQ_SOLICITED ? MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL : MTHCA_TAVOR_CQ_DB_REQ_NOT) | to_mcq(cq)->cqn); @@ -743,7 +744,7 @@ int mthca_tavor_arm_cq(struct ib_cq *cq, return 0; } -int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify) +int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) { struct mthca_cq *cq = to_mcq(ibcq); __be32 doorbell[2]; @@ -755,7 +756,8 @@ int mthca_arbel_arm_cq(struct ib_cq *ibc doorbell[0] = ci; doorbell[1] = cpu_to_be32((cq->cqn << 8) | (2 << 5) | (sn << 3) | - (notify == IB_CQ_SOLICITED ? 1 : 2)); + ((flags & IB_CQ_SOLICITED_MASK) == + IB_CQ_SOLICITED ? 1 : 2)); mthca_write_db_rec(doorbell, cq->arm_db); @@ -766,7 +768,7 @@ int mthca_arbel_arm_cq(struct ib_cq *ibc wmb(); doorbell[0] = cpu_to_be32((sn << 28) | - (notify == IB_CQ_SOLICITED ? + (flags == IB_CQ_SOLICITED ? MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL : MTHCA_ARBEL_CQ_DB_REQ_NOT) | cq->cqn); diff --git a/drivers/infiniband/hw/mthca/mthca_dev.h b/drivers/infiniband/hw/mthca/mthca_dev.h index b7e42ef..9bae3cc 100644 --- a/drivers/infiniband/hw/mthca/mthca_dev.h +++ b/drivers/infiniband/hw/mthca/mthca_dev.h @@ -495,8 +495,8 @@ void mthca_unmap_eq_icm(struct mthca_dev int mthca_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry); -int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify notify); -int mthca_arbel_arm_cq(struct ib_cq *cq, enum ib_cq_notify notify); +int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags); +int mthca_arbel_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags); int mthca_init_cq(struct mthca_dev *dev, int nent, struct mthca_ucontext *ctx, u32 pdn, struct mthca_cq *cq); diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index fd55826..15867af 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -311,6 +311,7 @@ extern struct workqueue_struct *ipoib_wo /* functions */ +int ipoib_poll(struct net_device *dev, int *budget); void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr); struct ipoib_ah *ipoib_create_ah(struct net_device *dev, diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c index e70492d..4c3fc5c 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c @@ -418,7 +418,7 @@ void ipoib_cm_handle_rx_wc(struct net_de skb->dev = dev; /* XXX get correct PACKET_ type here */ skb->pkt_type = PACKET_HOST; - netif_rx_ni(skb); + netif_receive_skb(skb); repost: if (unlikely(ipoib_cm_post_receive(dev, wr_id))) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index ba0ee5c..2f679ef 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -226,7 +226,7 @@ static void ipoib_ib_handle_rx_wc(struct skb->dev = dev; /* XXX get correct PACKET_ type here */ skb->pkt_type = PACKET_HOST; - netif_rx_ni(skb); + netif_receive_skb(skb); } else { ipoib_dbg_data(priv, "dropping loopback packet\n"); dev_kfree_skb_any(skb); @@ -280,28 +280,64 @@ static void ipoib_ib_handle_tx_wc(struct wc->status, wr_id, wc->vendor_err); } -static void ipoib_ib_handle_wc(struct net_device *dev, struct ib_wc *wc) +int ipoib_poll(struct net_device *dev, int *budget) { - if (wc->wr_id & IPOIB_CM_OP_SRQ) - ipoib_cm_handle_rx_wc(dev, wc); - else if (wc->wr_id & IPOIB_OP_RECV) - ipoib_ib_handle_rx_wc(dev, wc); - else - ipoib_ib_handle_tx_wc(dev, wc); + struct ipoib_dev_priv *priv = netdev_priv(dev); + int max = min(*budget, dev->quota); + int done; + int t; + int empty; + int n, i; + +repoll: + done = 0; + empty = 0; + + while (max) { + t = min(IPOIB_NUM_WC, max); + n = ib_poll_cq(priv->cq, t, priv->ibwc); + + for (i = 0; i < n; ++i) { + struct ib_wc *wc = priv->ibwc + i; + + if (wc->wr_id & IPOIB_CM_OP_SRQ) { + ++done; + --max; + ipoib_cm_handle_rx_wc(dev, wc); + } else if (wc->wr_id & IPOIB_OP_RECV) { + ++done; + --max; + ipoib_ib_handle_rx_wc(dev, wc); + } else + ipoib_ib_handle_tx_wc(dev, wc); + } + + if (n != t) { + empty = 1; + break; + } + } + + dev->quota -= done; + *budget -= done; + + if (empty) { + netif_rx_complete(dev); + if (unlikely(ib_req_notify_cq(priv->cq, + IB_CQ_NEXT_COMP | + IB_CQ_REPORT_MISSED_EVENTS)) && + netif_rx_reschedule(dev, 0)) + goto repoll; + + return 0; + } + + return 1; } void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr) { - struct net_device *dev = (struct net_device *) dev_ptr; - struct ipoib_dev_priv *priv = netdev_priv(dev); - int n, i; - - ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); - do { - n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc); - for (i = 0; i < n; ++i) - ipoib_ib_handle_wc(dev, priv->ibwc + i); - } while (n == IPOIB_NUM_WC); + netif_rx_schedule(dev_ptr); } static inline int post_send(struct ipoib_dev_priv *priv, @@ -514,9 +550,10 @@ int ipoib_ib_dev_stop(struct net_device struct ib_qp_attr qp_attr; unsigned long begin; struct ipoib_tx_buf *tx_req; - int i; + int i, n; clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags); + netif_poll_disable(dev); ipoib_cm_dev_stop(dev); @@ -568,6 +605,16 @@ int ipoib_ib_dev_stop(struct net_device goto timeout; } + do { + n = ib_poll_cq(priv->cq, IPOIB_NUM_WC, priv->ibwc); + for (i = 0; i < n; ++i) { + if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) + ipoib_ib_handle_rx_wc(dev, priv->ibwc + i); + else + ipoib_ib_handle_tx_wc(dev, priv->ibwc + i); + } + } while (n == IPOIB_NUM_WC); + msleep(1); } @@ -596,6 +643,9 @@ timeout: msleep(1); } + netif_poll_enable(dev); + ib_req_notify_cq(priv->cq, IB_CQ_NEXT_COMP); + return 0; } diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index f2a40ae..a69c472 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -952,6 +952,8 @@ static void ipoib_setup(struct net_devic dev->hard_header = ipoib_hard_header; dev->set_multicast_list = ipoib_set_mcast_list; dev->neigh_setup = ipoib_neigh_setup_dev; + dev->poll = ipoib_poll; + dev->weight = 100; dev->watchdog_timeo = HZ; diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 765589f..529a69d 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -431,9 +431,11 @@ struct ib_wc { u8 port_num; /* valid only for DR SMPs on switches */ }; -enum ib_cq_notify { - IB_CQ_SOLICITED, - IB_CQ_NEXT_COMP +enum ib_cq_notify_flags { + IB_CQ_SOLICITED = 1 << 0, + IB_CQ_NEXT_COMP = 1 << 1, + IB_CQ_SOLICITED_MASK = IB_CQ_SOLICITED | IB_CQ_NEXT_COMP, + IB_CQ_REPORT_MISSED_EVENTS = 1 << 2, }; enum ib_srq_attr_mask { @@ -987,7 +989,7 @@ struct ib_device { struct ib_wc *wc); int (*peek_cq)(struct ib_cq *cq, int wc_cnt); int (*req_notify_cq)(struct ib_cq *cq, - enum ib_cq_notify cq_notify); + enum ib_cq_notify_flags flags); int (*req_ncomp_notif)(struct ib_cq *cq, int wc_cnt); struct ib_mr * (*get_dma_mr)(struct ib_pd *pd, @@ -1414,14 +1416,34 @@ int ib_peek_cq(struct ib_cq *cq, int wc_ /** * ib_req_notify_cq - Request completion notification on a CQ. * @cq: The CQ to generate an event for. - * @cq_notify: If set to %IB_CQ_SOLICITED, completion notification will - * occur on the next solicited event. If set to %IB_CQ_NEXT_COMP, - * notification will occur on the next completion. + * @flags: + * Must contain exactly one of %IB_CQ_SOLICITED or %IB_CQ_NEXT_COMP + * to request an event on the next solicited event or next work + * completion at any type, respectively. %IB_CQ_REPORT_MISSED_EVENTS + * may also be |ed in to request a hint about missed events, as + * described below. + * + * Return Value: + * < 0 means an error occurred while requesting notification + * == 0 means notification was requested successfully, and if + * IB_CQ_REPORT_MISSED_EVENTS was passed in, then no events + * were missed and it is safe to wait for another event. In + * this case is it guaranteed that any work completions added + * to the CQ since the last CQ poll will trigger a completion + * notification event. + * > 0 is only returned if IB_CQ_REPORT_MISSED_EVENTS was passed + * in. It means that the consumer must poll the CQ again to + * make sure it is empty to avoid missing an event because of a + * race between requesting notification and an entry being + * added to the CQ. This return value means it is possible + * (but not guaranteed) that a work completion has been added + * to the CQ since the last poll without triggering a + * completion notification event. */ static inline int ib_req_notify_cq(struct ib_cq *cq, - enum ib_cq_notify cq_notify) + enum ib_cq_notify_flags flags) { - return cq->device->req_notify_cq(cq, cq_notify); + return cq->device->req_notify_cq(cq, flags); } /**