[PATCH v4] net/iavf: fix iavf query stats in intr thread

[Kaiwen Deng]

When iavf send query-stats command in eal-intr-thread through
virtual channel, there will be no response received from
iavf_dev_virtchnl_handler for this command during block and wait.
Because iavf_dev_virtchnl_handler is also registered in eal-intr-thread.

When vf device is bonded as BONDING_MODE_TLB mode, the slave device
update callback will registered in alarm and called by eal-intr-thread,
it would also raise the above issue.

This commit add to poll the response for VIRTCHNL_OP_GET_STATS
when it is called by eal-intr-thread to fix this issue.

Fixes: 91bf37d250aa ("net/iavf: add lock for VF commands")
Fixes: 22b123a36d07 ("net/avf: initialize PMD")
Fixes: 7c76a747e68c ("bond: add mode 5")
Fixes: 435d523112cc ("net/iavf: fix multi-process shared data")
Fixes: cb5c1b91f76f ("net/iavf: add thread for event callbacks")
Cc: stable at dpdk.org

Signed-off-by: Kaiwen Deng <kaiwenx.deng at intel.com>
---
Changes since v3:
- Rebase to latest dpdk-next-net-intel.

Changes since v2:
- Add to poll the response for VIRTCHNL_OP_GET_STATS.

Changes since v1:
- Add lock to avoid race condition.
---
---
 drivers/net/bonding/rte_eth_bond_pmd.c |  7 ++-
 drivers/net/iavf/iavf_ethdev.c         |  5 +-
 drivers/net/iavf/iavf_vchnl.c          | 71 ++++++++++++++++++--------
 3 files changed, 58 insertions(+), 25 deletions(-)

diff --git a/drivers/net/bonding/rte_eth_bond_pmd.c b/drivers/net/bonding/rte_eth_bond_pmd.c
index f0c4f7d26b..edce621496 100644
--- a/drivers/net/bonding/rte_eth_bond_pmd.c
+++ b/drivers/net/bonding/rte_eth_bond_pmd.c
@@ -894,6 +894,7 @@ bond_ethdev_update_tlb_slave_cb(void *arg)
 	uint8_t update_stats = 0;
 	uint16_t slave_id;
 	uint16_t i;
+	int ret;
 
 	internals->slave_update_idx++;
 
@@ -903,7 +904,10 @@ bond_ethdev_update_tlb_slave_cb(void *arg)
 
 	for (i = 0; i < internals->active_slave_count; i++) {
 		slave_id = internals->active_slaves[i];
-		rte_eth_stats_get(slave_id, &slave_stats);
+		ret = rte_eth_stats_get(slave_id, &slave_stats);
+		if (ret)
+			goto OUT;
+
 		tx_bytes = slave_stats.obytes - tlb_last_obytets[slave_id];
 		bandwidth_left(slave_id, tx_bytes,
 				internals->slave_update_idx, &bwg_array[i]);
@@ -922,6 +926,7 @@ bond_ethdev_update_tlb_slave_cb(void *arg)
 	for (i = 0; i < slave_count; i++)
 		internals->tlb_slaves_order[i] = bwg_array[i].slave;
 
+OUT:
 	rte_eal_alarm_set(REORDER_PERIOD_MS * 1000, bond_ethdev_update_tlb_slave_cb,
 			(struct bond_dev_private *)internals);
 }
diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
index 96004220a1..b72dbc8ceb 100644
--- a/drivers/net/iavf/iavf_ethdev.c
+++ b/drivers/net/iavf/iavf_ethdev.c
@@ -2647,6 +2647,9 @@ iavf_dev_init(struct rte_eth_dev *eth_dev)
 	adapter->dev_data = eth_dev->data;
 	adapter->stopped = 1;
 
+	if (iavf_dev_event_handler_init())
+		goto init_vf_err;
+
 	if (iavf_init_vf(eth_dev) != 0) {
 		PMD_INIT_LOG(ERR, "Init vf failed");
 		return -1;
@@ -2674,8 +2677,6 @@ iavf_dev_init(struct rte_eth_dev *eth_dev)
 	rte_ether_addr_copy((struct rte_ether_addr *)hw->mac.addr,
 			&eth_dev->data->mac_addrs[0]);
 
-	if (iavf_dev_event_handler_init())
-		goto init_vf_err;
 
 	if (vf->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_WB_ON_ITR) {
 		/* register callback func to eal lib */
diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c
index 8cc5377bcf..cb353db008 100644
--- a/drivers/net/iavf/iavf_vchnl.c
+++ b/drivers/net/iavf/iavf_vchnl.c
@@ -256,6 +256,7 @@ iavf_read_msg_from_pf(struct iavf_adapter *adapter, uint16_t buf_len,
 				vf->link_speed = iavf_convert_link_speed(speed);
 			}
 			iavf_dev_link_update(vf->eth_dev, 0);
+			iavf_dev_event_post(vf->eth_dev, RTE_ETH_EVENT_INTR_LSC, NULL, 0);
 			if (vf->link_up && !vf->vf_reset) {
 				iavf_dev_watchdog_disable(adapter);
 			} else {
@@ -374,28 +375,48 @@ iavf_execute_vf_cmd(struct iavf_adapter *adapter, struct iavf_cmd_info *args,
 		_clear_cmd(vf);
 		break;
 	default:
-		/* For other virtchnl ops in running time,
-		 * wait for the cmd done flag.
-		 */
-		do {
-			if (vf->pend_cmd == VIRTCHNL_OP_UNKNOWN)
-				break;
-			iavf_msec_delay(ASQ_DELAY_MS);
-			/* If don't read msg or read sys event, continue */
-		} while (i++ < MAX_TRY_TIMES);
-
-		if (i >= MAX_TRY_TIMES) {
-			PMD_DRV_LOG(ERR, "No response for cmd %d", args->ops);
+		if (rte_thread_is_intr()) {
+			/* For virtchnl ops were executed in eal_intr_thread,
+			 * need to poll the response.
+			 */
+			do {
+				result = iavf_read_msg_from_pf(adapter, args->out_size,
+							args->out_buffer);
+				if (result == IAVF_MSG_CMD)
+					break;
+				iavf_msec_delay(ASQ_DELAY_MS);
+			} while (i++ < MAX_TRY_TIMES);
+			if (i >= MAX_TRY_TIMES ||
+				vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
+				err = -1;
+				PMD_DRV_LOG(ERR, "No response or return failure (%d)"
+						" for cmd %d", vf->cmd_retval, args->ops);
+			}
 			_clear_cmd(vf);
-			err = -EIO;
-		} else if (vf->cmd_retval ==
-			   VIRTCHNL_STATUS_ERR_NOT_SUPPORTED) {
-			PMD_DRV_LOG(ERR, "Cmd %d not supported", args->ops);
-			err = -ENOTSUP;
-		} else if (vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
-			PMD_DRV_LOG(ERR, "Return failure %d for cmd %d",
-				    vf->cmd_retval, args->ops);
-			err = -EINVAL;
+		} else {
+			/* For other virtchnl ops in running time,
+			 * wait for the cmd done flag.
+			 */
+			do {
+				if (vf->pend_cmd == VIRTCHNL_OP_UNKNOWN)
+					break;
+				iavf_msec_delay(ASQ_DELAY_MS);
+				/* If don't read msg or read sys event, continue */
+			} while (i++ < MAX_TRY_TIMES);
+
+			if (i >= MAX_TRY_TIMES) {
+				PMD_DRV_LOG(ERR, "No response for cmd %d", args->ops);
+				_clear_cmd(vf);
+				err = -EIO;
+			} else if (vf->cmd_retval ==
+				VIRTCHNL_STATUS_ERR_NOT_SUPPORTED) {
+				PMD_DRV_LOG(ERR, "Cmd %d not supported", args->ops);
+				err = -ENOTSUP;
+			} else if (vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
+				PMD_DRV_LOG(ERR, "Return failure %d for cmd %d",
+						vf->cmd_retval, args->ops);
+				err = -EINVAL;
+			}
 		}
 		break;
 	}
@@ -409,8 +430,14 @@ iavf_execute_vf_cmd_safe(struct iavf_adapter *adapter,
 {
 	struct iavf_info *vf = IAVF_DEV_PRIVATE_TO_VF(adapter);
 	int ret;
+	int is_intr_thread = rte_thread_is_intr();
 
-	rte_spinlock_lock(&vf->aq_lock);
+	if (is_intr_thread) {
+		if (!rte_spinlock_trylock(&vf->aq_lock))
+			return -EIO;
+	} else {
+		rte_spinlock_lock(&vf->aq_lock);
+	}
 	ret = iavf_execute_vf_cmd(adapter, args, async);
 	rte_spinlock_unlock(&vf->aq_lock);
 
-- 
2.34.1