[PATCH v4] net/igc: add support for secondary processes

[Zeng, ZhichaoX]

>> The RX function was not specified in the secondary process, causing 
>> the secondary process to segfault in a multi-process environment.
>> 
>> This patch specify RX/TX functions in "dev_init" to support secondary processes.
>> 
>> Fixes: 66fde1b943eb ("net/igc: add skeleton")
>> Cc: alvinx.zhang at intel.com
>> Cc: stable at dpdk.org
>> 
>> Signed-off-by: Zhichao Zeng <zhichaox.zeng at intel.com>
>> 
>> ---
>> v2:
>> remove unnecessary parameters, move declaration to relevant header 
>> file
>> ---
>> v3:
>> remove redundant code, optimize commit log
>> ---
>> v4:
>> rework patch
>> ---
>>  drivers/net/igc/igc_ethdev.c | 9 ++++++++-
>>  drivers/net/igc/igc_txrx.c   | 8 ++++----
>>  drivers/net/igc/igc_txrx.h   | 6 ++++++
>>  3 files changed, 18 insertions(+), 5 deletions(-)
>> 
>> diff --git a/drivers/net/igc/igc_ethdev.c 
>> b/drivers/net/igc/igc_ethdev.c index
>> b9933b395d..7f221a5d34 100644
>> --- a/drivers/net/igc/igc_ethdev.c
>> +++ b/drivers/net/igc/igc_ethdev.c
>> @@ -1240,8 +1240,15 @@ eth_igc_dev_init(struct rte_eth_dev *dev)
>>  	 * has already done this work. Only check we don't need a different
>>  	 * RX function.
>>  	 */
>> -	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
>> +	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
>> +		dev->rx_pkt_burst = igc_recv_pkts;
>> +		if (dev->data->scattered_rx)
>> +			dev->rx_pkt_burst = igc_recv_scattered_pkts;
>
>Please removed the redundant code in igc_rx_init

Only the main process will execute "igc_rx_init", and the secondary process will not execute it.
So, the data path of the secondary process is not initialized. 

The code that this patch adds to initialize the data path in "dev_init" will only be executed in the
secondary process. The same code in "igc_rx_init" is not redundant.

May I ask if the commit log is confusing, and should I submit new patch to correct it?

Regards
Zhichao