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From: Noa Ezra <noae@mellanox.com>
To: maxime.coquelin@redhat.com
Cc: matan@mellanox.com, dev@dpdk.org, noae@mellanox.com, stable@dpdk.org
Subject: [dpdk-dev] [PATCH] net/vhost: fix redundant queue state event
Date: Wed, 19 Jun 2019 06:16:00 +0000	[thread overview]
Message-ID: <1560924960-221163-1-git-send-email-noae@mellanox.com> (raw)

In some situations, when a virtual machine is starting,
vring_state_changed can be called while there was no change in the
queue state. This fix makes sure that there was really a change in the
queue state before calling the callback for EVENT_QUEUE_STATE.

Fixes: ee584e9710b9 ("vhost: add driver on top of the library")
Cc: stable@dpdk.org
Reviewed-by: Matan Azrad <matan@mellanox.com>
---
 drivers/net/vhost/rte_eth_vhost.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c
index cad1e5c..fbe7a37 100644
--- a/drivers/net/vhost/rte_eth_vhost.c
+++ b/drivers/net/vhost/rte_eth_vhost.c
@@ -855,6 +855,10 @@ struct vhost_xstats_name_off {
 	/* won't be NULL */
 	state = vring_states[eth_dev->data->port_id];
 	rte_spinlock_lock(&state->lock);
+	if (state->cur[vring] == enable) {
+		rte_spinlock_unlock(&state->lock);
+		return 0;
+	}
 
 	state->cur[vring] = enable;
 	state->max_vring = RTE_MAX(vring, state->max_vring);
-- 
1.8.3.1


             reply	other threads:[~2019-06-19  6:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-19  6:16 Noa Ezra [this message]
2019-06-20  6:33 ` [dpdk-dev] [PATCH v2] " Noa Ezra
2019-09-27  8:49   ` Maxime Coquelin
2019-09-27  9:49     ` Maxime Coquelin
2019-06-25  7:04 ` [dpdk-dev] [Suspected-Phishing][PATCH] " Noa Ezra
2019-06-25  8:23   ` Maxime Coquelin
2019-06-26  6:37     ` Noa Ezra
2019-06-26  7:01       ` Maxime Coquelin
2019-06-26  8:03         ` Noa Ezra
2019-06-26  8:54           ` Maxime Coquelin

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