[dpdk-dev] [PATCH v3] net/i40e: fix request queue fail in VF

[taox.zhu@intel.com]

From: Zhu Tao <taox.zhu@intel.com>

When the VF configuration is larger than the number of queues reserved
by PF, VF sends the request queue command through admin queue. When PF
received this command, it may reset the VF and send a notification
before resetting. If this notification is read by the timed task alarm,
Task request queue will lost notification. This patch prevents two
tasks from running simultaneously.

Fixes: 864a800d70 ("net/i40e: remove VF interrupt handler")
Fixes: ee653bd800 ("net/i40e: determine number of queues per VF at run time")
Cc: stable@dpdk.org

Signed-off-by: Zhu Tao <taox.zhu@intel.com>
---
 drivers/net/i40e/i40e_ethdev_vf.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index 5be32b069..34aaaf207 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -140,6 +140,8 @@ static int
 i40evf_set_mc_addr_list(struct rte_eth_dev *dev,
 			struct rte_ether_addr *mc_addr_set,
 			uint32_t nb_mc_addr);
+static void
+i40evf_dev_alarm_handler(void *param);
 
 /* Default hash key buffer for RSS */
 static uint32_t rss_key_default[I40E_VFQF_HKEY_MAX_INDEX + 1];
@@ -1051,10 +1053,14 @@ i40evf_request_queues(struct rte_eth_dev *dev, uint16_t num)
 	args.in_args_size = sizeof(vfres);
 	args.out_buffer = vf->aq_resp;
 	args.out_size = I40E_AQ_BUF_SZ;
+
+	rte_eal_alarm_cancel(i40evf_dev_alarm_handler, dev);
 	err = i40evf_execute_vf_cmd(dev, &args);
 	if (err)
 		PMD_DRV_LOG(ERR, "fail to execute command OP_REQUEST_QUEUES");
 
+	rte_eal_alarm_set(I40EVF_ALARM_INTERVAL,
+			  i40evf_dev_alarm_handler, dev);
 	return err;
 }
 
-- 
2.17.1