[dpdk-dev] [PATCH v5 3/3] ethdev: fix wrong error return refere to API definition

[Cunming Liang]

Per definition, rte_eth_rx_burst/rte_eth_tx_burst/rte_eth_rx_queue_count 
returns the packet number.
When RTE_LIBRTE_ETHDEV_DEBUG turns on, retval of FUNC_PTR_OR_ERR_RTE was set to 
-ENOTSUP.
It makes confusing.
The patch always return 0 no matter no packet or there's error.
Meanwhile set errno in such kind of checking.

Signed-off-by: Cunming Liang <cunming.liang at intel.com>
---
 lib/librte_ether/rte_ethdev.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index 50f10d9..6675f28 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -81,12 +81,14 @@
 /* Macros for checking for restricting functions to primary instance only */
 #define PROC_PRIMARY_OR_ERR_RET(retval) do { \
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
+               rte_errno = -E_RTE_SECONDARY;                           \
                PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
                return (retval); \
        } \
 } while(0)
 #define PROC_PRIMARY_OR_RET() do { \
        if (rte_eal_process_type() != RTE_PROC_PRIMARY) { \
+               rte_errno = -E_RTE_SECONDARY;                           \
                PMD_DEBUG_TRACE("Cannot run in secondary processes\n"); \
                return; \
        } \
@@ -95,12 +97,14 @@
 /* Macros to check for invlaid function pointers in dev_ops structure */
 #define FUNC_PTR_OR_ERR_RET(func, retval) do { \
        if ((func) == NULL) { \
+               rte_errno = -ENOTSUP; \
                PMD_DEBUG_TRACE("Function not supported\n"); \
                return (retval); \
        } \
 } while(0)
 #define FUNC_PTR_OR_RET(func) do { \
        if ((func) == NULL) { \
+               rte_errno = -ENOTSUP; \
                PMD_DEBUG_TRACE("Function not supported\n"); \
                return; \
        } \
@@ -2530,7 +2534,7 @@ rte_eth_rx_burst(uint8_t port_id, uint16_t queue_id,
                return 0;
        }
        dev = &rte_eth_devices[port_id];
-       FUNC_PTR_OR_ERR_RET(*dev->rx_pkt_burst, -ENOTSUP);
+       FUNC_PTR_OR_ERR_RET(*dev->rx_pkt_burst, 0);
        if (queue_id >= dev->data->nb_rx_queues) {
                PMD_DEBUG_TRACE("Invalid RX queue_id=%d\n", queue_id);
                return 0;
@@ -2551,7 +2555,7 @@ rte_eth_tx_burst(uint8_t port_id, uint16_t queue_id,
        }
        dev = &rte_eth_devices[port_id];

-       FUNC_PTR_OR_ERR_RET(*dev->tx_pkt_burst, -ENOTSUP);
+       FUNC_PTR_OR_ERR_RET(*dev->tx_pkt_burst, 0);
        if (queue_id >= dev->data->nb_tx_queues) {
                PMD_DEBUG_TRACE("Invalid TX queue_id=%d\n", queue_id);
                return 0;
@@ -2570,7 +2574,7 @@ rte_eth_rx_queue_count(uint8_t port_id, uint16_t queue_id)
                return 0;
        }
        dev = &rte_eth_devices[port_id];
-       FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_count, -ENOTSUP);
+       FUNC_PTR_OR_ERR_RET(*dev->dev_ops->rx_queue_count, 0);
        return (*dev->dev_ops->rx_queue_count)(dev, queue_id);
 }

-- 
1.7.4.1