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IB/{ipoib,hfi1}: Add a timeout handler for rdma_netdev

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The current rdma_netdev handling in ipoib hooks the tx_timeout handler,
but prints out a totally useless message that prevents effective debugging
especially when multiple transmit queues are being used.

Add a tx_timeout rdma_netdev hook and implement the callback in the hfi1
to print additional information.

The existing non-helpful message is avoided when the driver has presented
a callback.

Link: https://lore.kernel.org/r/1617026056-50483-3-git-send-email-dennis.dalessandro@cornelisnetworks.com
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Mike Marciniszyn 2021-03-29 09:54:08 -04:00 committed by Jason Gunthorpe
parent 4bd00b55c9
commit 042a00f93a
5 changed files with 39 additions and 0 deletions
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2
drivers/infiniband/hw/hfi1/ipoib.h
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@ -147,4 +147,6 @@ int hfi1_ipoib_rn_get_params(struct ib_device *device,
enum rdma_netdev_t type,
struct rdma_netdev_alloc_params *params);
void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q);
#endif /* _IPOIB_H */

1
drivers/infiniband/hw/hfi1/ipoib_main.c
View File

@ -204,6 +204,7 @@ static int hfi1_ipoib_setup_rn(struct ib_device *device,
int rc;
rn->send = hfi1_ipoib_send;
rn->tx_timeout = hfi1_ipoib_tx_timeout;
rn->attach_mcast = hfi1_ipoib_mcast_attach;
rn->detach_mcast = hfi1_ipoib_mcast_detach;
rn->set_id = hfi1_ipoib_set_id;

29
drivers/infiniband/hw/hfi1/ipoib_tx.c
View File

@ -866,3 +866,32 @@ void hfi1_ipoib_napi_tx_disable(struct net_device *dev)
(void)hfi1_ipoib_drain_tx_ring(txq, txq->tx_ring.max_items);
}
}
void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q)
{
struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
struct hfi1_ipoib_txq *txq = &priv->txqs[q];
u64 completed = atomic64_read(&txq->complete_txreqs);
dd_dev_info(priv->dd, "timeout txq %llx q %u stopped %u stops %d no_desc %d ring_full %d\n",
(unsigned long long)txq, q,
__netif_subqueue_stopped(dev, txq->q_idx),
atomic_read(&txq->stops),
atomic_read(&txq->no_desc),
atomic_read(&txq->ring_full));
dd_dev_info(priv->dd, "sde %llx engine %u\n",
(unsigned long long)txq->sde,
txq->sde ? txq->sde->this_idx : 0);
dd_dev_info(priv->dd, "flow %x\n", txq->flow.as_int);
dd_dev_info(priv->dd, "sent %llu completed %llu used %llu\n",
txq->sent_txreqs, completed, hfi1_ipoib_used(txq));
dd_dev_info(priv->dd, "tx_queue_len %u max_items %lu\n",
dev->tx_queue_len, txq->tx_ring.max_items);
dd_dev_info(priv->dd, "head %lu tail %lu\n",
txq->tx_ring.head, txq->tx_ring.tail);
dd_dev_info(priv->dd, "wait queued %u\n",
!list_empty(&txq->wait.list));
dd_dev_info(priv->dd, "tx_list empty %u\n",
list_empty(&txq->tx_list));
}

5
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -1181,7 +1181,12 @@ unref:
static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
{
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct rdma_netdev *rn = netdev_priv(dev);
if (rn->tx_timeout) {
rn->tx_timeout(dev, txqueue);
return;
}
ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
jiffies_to_msecs(jiffies - dev_trans_start(dev)));
ipoib_warn(priv,

2
include/rdma/ib_verbs.h
View File

@ -2215,6 +2215,8 @@ struct rdma_netdev {
int set_qkey, u32 qkey);
int (*detach_mcast)(struct net_device *dev, struct ib_device *hca,
union ib_gid *gid, u16 mlid);
/* timeout */
void (*tx_timeout)(struct net_device *dev, unsigned int txqueue);
};
struct rdma_netdev_alloc_params {