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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Date: Mon, 27 Jun 2016 19:04:43 +0100
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Subject: Re: [dpdk-users] my problem about
 ixgbe_rx_vec_dev_conf_condition_check is called by ixgbe_set_rx_function in
 ixgbe
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On 5/27/2016 2:32 PM, ³ÉèëÕß±ð wrote:
> hello,
> 
> 
> firstly ,gcc version is 3.4.3.
> 
> 
> "PMD: ixgbe_set_rx_function(): Port[0] doesn't meet Vector Rx preconditions or RTE_IXGBE_INC_VECTOR is not enabled" is outputed while running l2fwd  and l3fwd ,i GDB the l2fwd and l3fwd.
> i found ixgbe_rx_vec_dev_conf_condition_check has two definition ,one is:
> int __attribute__((weak))
> ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev __rte_unused *dev)
> {
> 	return -1;
> }
> 
> 
> the other is:
> int __attribute__((cold))
> ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev *dev)
> {
> ....
> }
> when i GDB the EXE, port_conf.rxmode.hw_ip_checksum was set to 0 .
> ixgbe_set_rx_function call the former at every turn ,i want to know why .
> 
> 
> any help would be appreciated.
> 

I don't know if this is from same person/team, but if not please check
following mail thread for same issue:

http://dpdk.org/ml/archives/dev/2016-June/042323.html

If issue is still valid for you:
Briefly, weak function is defined for the case RTE_IXGBE_INC_VECTOR
config option not enabled.

Which one to link against will be chosen on build time, if app linked
against first one, I would guess RTE_IXGBE_INC_VECTOR is not enabled,
can you please share the output of:
objdump -x librte_pmd_i40e.a| grep i40e_rx_vec_dev_conf_condition_check

Thanks,
ferruh