Re: [dpdk-dev] [PATCH 2/2] ethdev: fix VLAN offloads set if no relative capabilities

["Wei Hu (Xavier)" <xavier.huwei@huawei.com>]

Hi, Andrew Rybchenko


On 2020/6/19 16:37, Andrew Rybchenko wrote:
> On 6/19/20 6:42 AM, Wei Hu (Xavier) wrote:
>> From: Chengchang Tang <tangchengchang@huawei.com>
>>
>> Currently, there is a potential problem that calling the API function
>> rte_eth_dev_set_vlan_offload to start a vlan hardware offloads which the
>> driver does not support. if the PMD driver does not support the relative
>> hardware offloads and does not check for it, the hardware setting will
>> not change, but the relative offload in dev->data->dev_conf.rxmode.offloads
>> will be turned on.
> I'm sorry, but I don't understand what 'relative' means in the
> context.
>
> Also, please, use 'VLAN' instead of 'vlan' in the description
> and log message below.
OK, I will fix it in V2.
>> It is supposed to check the hardware capabilities to decide whether the
>> relative callback needs to be called just like the behavior in the API
>> function named rte_eth_dev_configure.
> I think the direction of the fix is right, but it definitely
> duplicates checks which are done in some PMDs. I think that it
> would be good to do the cleanup in follow up patches.
I will clean them in V2.
>> Fixes: 81f9db8ecc2c ("ethdev: add vlan offload support")
> Most likely it is incorrect, since generic Rx offloads were
> introduced later.
OK, I will replace it with the following statement in V2.

   Fixes: a4996bd89c42 ("ethdev: new Rx/Tx offloads API")

Thanks, Xavier

>
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>> ---
>>   lib/librte_ethdev/rte_ethdev.c | 21 +++++++++++++++++++++
>>   1 file changed, 21 insertions(+)
>>
>> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
>> index 122fd2a..5176a0e 100644
>> --- a/lib/librte_ethdev/rte_ethdev.c
>> +++ b/lib/librte_ethdev/rte_ethdev.c
>> @@ -3261,12 +3261,14 @@ rte_eth_dev_set_vlan_ether_type(uint16_t port_id,
>>   int
>>   rte_eth_dev_set_vlan_offload(uint16_t port_id, int offload_mask)
>>   {
>> +	struct rte_eth_dev_info dev_info;
>>   	struct rte_eth_dev *dev;
>>   	int ret = 0;
>>   	int mask = 0;
>>   	int cur, org = 0;
>>   	uint64_t orig_offloads;
>>   	uint64_t dev_offloads;
>> +	uint64_t new_offloads;
>>   
>>   	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
>>   	dev = &rte_eth_devices[port_id];
>> @@ -3320,6 +3322,25 @@ rte_eth_dev_set_vlan_offload(uint16_t port_id, int offload_mask)
>>   	if (mask == 0)
>>   		return ret;
>>   
>> +	ret = rte_eth_dev_info_get(port_id, &dev_info);
>> +	if (ret != 0)
>> +		return ret;
>> +
>> +	/*
>> +	 * New added Rx vlan offloading which are not enabled in
>> +	 * rte_eth_dev_configure() must be within its device capabilities
>> +	 */
>> +	if ((dev_offloads & dev_info.rx_offload_capa) != dev_offloads) {
>> +		new_offloads = dev_offloads & ~orig_offloads;
>> +		RTE_ETHDEV_LOG(ERR,
>> +			"Ethdev port_id=%u requested new added vlan offloads "
>> +			"0x%" PRIx64 " must be within Rx offloads capabilities "
>> +			"0x%"PRIx64 " in %s()\n",
>> +			port_id, new_offloads, dev_info.rx_offload_capa,
>> +			__func__);
>> +		return -EINVAL;
>> +	}
>> +
>>   	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->vlan_offload_set, -ENOTSUP);
>>   	dev->data->dev_conf.rxmode.offloads = dev_offloads;
>>   	ret = (*dev->dev_ops->vlan_offload_set)(dev, mask);
>>
>