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* [dpdk-stable] [PATCH] ethdev: fix link status query
@ 2018-04-10  6:16 Shahaf Shuler
  2018-04-10  8:20 ` Nélio Laranjeiro
  0 siblings, 1 reply; 4+ messages in thread
From: Shahaf Shuler @ 2018-04-10  6:16 UTC (permalink / raw)
  To: ferruh.yigit, thomas; +Cc: dev, stable, stephen, nelio.laranjeiro

When application works with LSC interrupts the ethdev layer skips
the PMD callback and update according to the link status exists on
device data. It is because it assumes the link status on the device data
is the correct one since any link change is processed by the application.

As multiple PMDs install the link status interrupt handler only on port
start and uninstall it on port stop, the link status may be incorrect in
case the query is called after port stop or before port start.

Fixing the query implementation to use the PMD callback for such cases.

Fixes: b77d21cc2364 ("ethdev: add link status get/set helper functions")
Cc: stable@dpdk.org
Cc: stephen@networkplumber.org
Cc: nelio.laranjeiro@6wind.com

Signed-off-by: Shahaf Shuler <shahafs@mellanox.com>
---
 lib/librte_ether/rte_ethdev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 2c74f7e049..0857670ebe 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1789,7 +1789,8 @@ rte_eth_link_get(uint16_t port_id, struct rte_eth_link *eth_link)
 	RTE_ETH_VALID_PORTID_OR_RET(port_id);
 	dev = &rte_eth_devices[port_id];
 
-	if (dev->data->dev_conf.intr_conf.lsc)
+	if (dev->data->dev_conf.intr_conf.lsc &&
+	    dev->data->dev_started)
 		rte_eth_linkstatus_get(dev, eth_link);
 	else {
 		RTE_FUNC_PTR_OR_RET(*dev->dev_ops->link_update);
@@ -1806,7 +1807,8 @@ rte_eth_link_get_nowait(uint16_t port_id, struct rte_eth_link *eth_link)
 	RTE_ETH_VALID_PORTID_OR_RET(port_id);
 	dev = &rte_eth_devices[port_id];
 
-	if (dev->data->dev_conf.intr_conf.lsc)
+	if (dev->data->dev_conf.intr_conf.lsc &&
+	    dev->data->dev_started)
 		rte_eth_linkstatus_get(dev, eth_link);
 	else {
 		RTE_FUNC_PTR_OR_RET(*dev->dev_ops->link_update);
-- 
2.12.0

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2018-04-10 18:34 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-04-10  6:16 [dpdk-stable] [PATCH] ethdev: fix link status query Shahaf Shuler
2018-04-10  8:20 ` Nélio Laranjeiro
2018-04-10  8:29   ` Thomas Monjalon
2018-04-10 18:34     ` Ferruh Yigit

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