From: Matan Azrad <matan@mellanox.com>
To: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>,
Adrien Mazarguil <adrien.mazarguil@6wind.com>
Cc: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v4 1/2] net/mlx5: link status update separation
Date: Wed, 6 Sep 2017 18:03:57 +0300 [thread overview]
Message-ID: <1504710238-25726-1-git-send-email-matan@mellanox.com> (raw)
Link status is sometimes inconsistent during a LSC event.
When it occurs, the PMD refrains from immediately notifying
the application; instead, an alarm is scheduled to check
link status later and notify the application once it has settled.
In the previous code the alarm callback calls to the interrupt
handler for link status recheck and may cause to unnecessary
interrupt events check.
This patch separates the link status update and the interrupt event
handler to avoid the unnecessary check and arranges the interrupt
handler for more interrupt supports in the future.
Comment was added in the new function to explain the inconsistent
link status reason.
Signed-off-by: Matan Azrad <matan@mellanox.com>
---
drivers/net/mlx5/mlx5_ethdev.c | 83 ++++++++++++++++++++++++++++--------------
1 file changed, 55 insertions(+), 28 deletions(-)
Changes:
V2:
Replace link status update function name.
Add inconsistent link workaround comment.
V3:
Fix indentations.
Accurate inconsistent link comment.
V4:
Separate the patch.
Short the comment.
diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 57f6237..64a8db8 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -1112,47 +1112,74 @@ mlx5_ibv_device_to_pci_addr(const struct ibv_device *device,
}
/**
- * Link status handler.
+ * Update the link status.
*
* @param priv
* Pointer to private structure.
- * @param dev
- * Pointer to the rte_eth_dev structure.
*
* @return
- * Nonzero if the callback process can be called immediately.
+ * Zero if the callback process can be called immediately.
*/
static int
-priv_dev_link_status_handler(struct priv *priv, struct rte_eth_dev *dev)
+priv_link_status_update(struct priv *priv)
+{
+ struct rte_eth_link *link = &priv->dev->data->dev_link;
+
+ mlx5_link_update(priv->dev, 0);
+ if (((link->link_speed == 0) && link->link_status) ||
+ ((link->link_speed != 0) && !link->link_status)) {
+ /*
+ * Inconsistent status. Event likely occurred before the
+ * kernel netdevice exposes the new status.
+ */
+ if (!priv->pending_alarm) {
+ priv->pending_alarm = 1;
+ rte_eal_alarm_set(MLX5_ALARM_TIMEOUT_US,
+ mlx5_dev_link_status_handler,
+ priv->dev);
+ }
+ return 1;
+ } else if (unlikely(priv->pending_alarm)) {
+ /* Link interrupt occurred while alarm is already scheduled. */
+ priv->pending_alarm = 0;
+ rte_eal_alarm_cancel(mlx5_dev_link_status_handler, priv->dev);
+ }
+ return 0;
+}
+
+/**
+ * Device status handler.
+ *
+ * @param priv
+ * Pointer to private structure.
+ * @param events
+ * Pointer to event flags holder.
+ *
+ * @return
+ * Events bitmap of callback process which can be called immediately.
+ */
+static uint32_t
+priv_dev_status_handler(struct priv *priv)
{
struct ibv_async_event event;
- struct rte_eth_link *link = &dev->data->dev_link;
- int ret = 0;
+ uint32_t ret = 0;
/* Read all message and acknowledge them. */
for (;;) {
if (ibv_get_async_event(priv->ctx, &event))
break;
-
- if (event.event_type != IBV_EVENT_PORT_ACTIVE &&
- event.event_type != IBV_EVENT_PORT_ERR)
+ if ((event.event_type == IBV_EVENT_PORT_ACTIVE ||
+ event.event_type == IBV_EVENT_PORT_ERR) &&
+ (priv->dev->data->dev_conf.intr_conf.lsc == 1))
+ ret |= (1 << RTE_ETH_EVENT_INTR_LSC);
+ else
DEBUG("event type %d on port %d not handled",
event.event_type, event.element.port_num);
ibv_ack_async_event(&event);
}
- mlx5_link_update(dev, 0);
- if (((link->link_speed == 0) && link->link_status) ||
- ((link->link_speed != 0) && !link->link_status)) {
- if (!priv->pending_alarm) {
- /* Inconsistent status, check again later. */
- priv->pending_alarm = 1;
- rte_eal_alarm_set(MLX5_ALARM_TIMEOUT_US,
- mlx5_dev_link_status_handler,
- dev);
- }
- } else {
- ret = 1;
- }
+ if (ret & (1 << RTE_ETH_EVENT_INTR_LSC))
+ if (priv_link_status_update(priv))
+ ret &= ~(1 << RTE_ETH_EVENT_INTR_LSC);
return ret;
}
@@ -1172,9 +1199,9 @@ mlx5_dev_link_status_handler(void *arg)
priv_lock(priv);
assert(priv->pending_alarm == 1);
priv->pending_alarm = 0;
- ret = priv_dev_link_status_handler(priv, dev);
+ ret = priv_link_status_update(priv);
priv_unlock(priv);
- if (ret)
+ if (!ret)
_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC, NULL,
NULL);
}
@@ -1192,12 +1219,12 @@ mlx5_dev_interrupt_handler(void *cb_arg)
{
struct rte_eth_dev *dev = cb_arg;
struct priv *priv = dev->data->dev_private;
- int ret;
+ uint32_t events;
priv_lock(priv);
- ret = priv_dev_link_status_handler(priv, dev);
+ events = priv_dev_status_handler(priv);
priv_unlock(priv);
- if (ret)
+ if (events & (1 << RTE_ETH_EVENT_INTR_LSC))
_rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_INTR_LSC, NULL,
NULL);
}
--
2.7.4
next reply other threads:[~2017-09-06 15:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-06 15:03 Matan Azrad [this message]
2017-09-06 15:03 ` [dpdk-dev] [PATCH v4 2/2] net/mlx5: support device removal event Matan Azrad
2017-09-06 15:14 ` Adrien Mazarguil
2017-09-08 10:05 ` Ferruh Yigit
2017-09-08 10:47 ` [dpdk-dev] [PATCH v5] " Matan Azrad
2017-09-11 16:12 ` Ferruh Yigit
2017-09-06 15:14 ` [dpdk-dev] [PATCH v4 1/2] net/mlx5: link status update separation Adrien Mazarguil
2017-09-11 16:12 ` Ferruh Yigit
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1504710238-25726-1-git-send-email-matan@mellanox.com \
--to=matan@mellanox.com \
--cc=adrien.mazarguil@6wind.com \
--cc=dev@dpdk.org \
--cc=nelio.laranjeiro@6wind.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).