Re: [PATCH] ethdev: fixed device info get issue

["Yang, Qiming" <qiming.yang@intel.com>]

From: Andrew Rybchenko [mailto:arybchenko@solarflare.com]
Sent: Tuesday, May 15, 2018 4:42 PM
To: Yang, Qiming <qiming.yang@intel.com>; dev@dpdk.org
Cc: stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] ethdev: fixed device info get issue

On 05/15/2018 07:10 PM, Qiming Yang wrote:

This patch fixed error function call order in rte_eth_dev_configure.

This wrong order makes user can't get correct device informations,

and cause DCB configure issue.



Fixes: 3be82f5cc5e3 ("ethdev: support PMD-tuned Tx/Rx parameters")



Signed-off-by: Qiming Yang <qiming.yang@intel.com><mailto:qiming.yang@intel.com>

---

 lib/librte_ethdev/rte_ethdev.c | 6 +++---

 1 file changed, 3 insertions(+), 3 deletions(-)



diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c

index b3ed821..97316f3 100644

--- a/lib/librte_ethdev/rte_ethdev.c

+++ b/lib/librte_ethdev/rte_ethdev.c

@@ -1053,6 +1053,9 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,

  RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_infos_get, -ENOTSUP);

  RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_configure, -ENOTSUP);



+        /* Copy the dev_conf parameter into the dev structure */

+        memcpy(&dev->data->dev_conf, &local_conf, sizeof(dev->data->dev_conf));

+

         rte_eth_dev_info_get(port_id, &dev_info);



         /* If number of queues specified by application for both Rx and Tx is

@@ -1098,9 +1101,6 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,

                rte_eth_convert_rx_offload_bitfield(

                                &dev_conf->rxmode, &local_conf.rxmode.offloads);



-        /* Copy the dev_conf parameter into the dev structure */

-        memcpy(&dev->data->dev_conf, &local_conf, sizeof(dev->data->dev_conf));

-

As I understand the goal of this copy is to pickup offloads fill in done three lines
above. The patch breaks it.

Thanks for your reminder, I don’t know the background before. But Ferruh give a solution to resolve
The conflict. I’ll send a v2 patch later.



         /*

          * Check that the numbers of RX and TX queues are not greater

          * than the maximum number of RX and TX queues supported by the