[dpdk-dev] [PATCH v1] net/i40e: fix virtual channel confiliction issue

[Yuying Zhang <yuying.zhang@intel.com>]

i40evf_execute_vf_cmd() uses _atomic_set_cmd() to execute virtual
channel commands safely in multi-process mode. However, it returns -1
when one process is pending. Add a spinlock to wait for the virtual
channel will handle this issue in concurrent scenarios.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable@dpdk.org

Signed-off-by: Yuying Zhang <yuying.zhang@intel.com>
---
 drivers/net/i40e/i40e_ethdev.h    | 1 +
 drivers/net/i40e/i40e_ethdev_vf.c | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 19f821829..514c0988b 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -1199,6 +1199,7 @@ struct i40e_vf {
 	uint16_t max_pkt_len; /* Maximum packet length */
 	bool promisc_unicast_enabled;
 	bool promisc_multicast_enabled;
+	rte_spinlock_t cmd_send_lock;
 
 	uint32_t version_major; /* Major version number */
 	uint32_t version_minor; /* Minor version number */
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 69cab8e73..7fdc58649 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -326,8 +326,11 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 	enum i40evf_aq_result ret;
 	int err, i = 0;
 
-	if (_atomic_set_cmd(vf, args->ops))
+	rte_spinlock_lock(&vf->cmd_send_lock);
+	if (_atomic_set_cmd(vf, args->ops)) {
+		rte_spinlock_unlock(&vf->cmd_send_lock);
 		return -1;
+	}
 
 	info.msg = args->out_buffer;
 	info.buf_len = args->out_size;
@@ -339,6 +342,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 	if (err) {
 		PMD_DRV_LOG(ERR, "fail to send cmd %d", args->ops);
 		_clear_cmd(vf);
+		rte_spinlock_unlock(&vf->cmd_send_lock);
 		return err;
 	}
 
@@ -406,6 +410,7 @@ i40evf_execute_vf_cmd(struct rte_eth_dev *dev, struct vf_cmd_info *args)
 		break;
 	}
 
+	rte_spinlock_unlock(&vf->cmd_send_lock);
 	return err | vf->cmd_retval;
 }
 
@@ -1249,6 +1254,7 @@ i40evf_init_vf(struct rte_eth_dev *dev)
 
 	vf->adapter = I40E_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private);
 	vf->dev_data = dev->data;
+	rte_spinlock_init(&vf->cmd_send_lock);
 	err = i40e_set_mac_type(hw);
 	if (err) {
 		PMD_INIT_LOG(ERR, "set_mac_type failed: %d", err);
-- 
2.25.1