Re: [dpdk-dev] [PATCH v4 07/11] eal/pci: Add a function to remove the entry of devargs list

[Tetsuya Mukawa <mukawa@igel.co.jp>]

Hi Michael,

On 2015/01/21 11:55, Qiu, Michael wrote:
> On 1/19/2015 6:42 PM, Tetsuya Mukawa wrote:
>> The function removes the specified devargs entry from devargs_list.
>> Also the patch adds sanity checking to rte_eal_devargs_add().
>>
>> v4:
>> - Fix sanity check code
>>
>> Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
>> ---
>>  lib/librte_eal/common/eal_common_devargs.c  | 57 +++++++++++++++++++++++++++++
>>  lib/librte_eal/common/include/rte_devargs.h | 18 +++++++++
>>  2 files changed, 75 insertions(+)
>>
>> diff --git a/lib/librte_eal/common/eal_common_devargs.c b/lib/librte_eal/common/eal_common_devargs.c
>> index 4c7d11a..a360a85 100644
>> --- a/lib/librte_eal/common/eal_common_devargs.c
>> +++ b/lib/librte_eal/common/eal_common_devargs.c
>> @@ -44,6 +44,35 @@
>>  struct rte_devargs_list devargs_list =
>>  	TAILQ_HEAD_INITIALIZER(devargs_list);
>>  
>> +
>> +/* find a entry specified by pci address or device name */
>> +static struct rte_devargs *
>> +rte_eal_devargs_find(enum rte_devtype devtype, void *args)
>> +{
>> +	struct rte_devargs *devargs;
>> +
>> +	if (args == NULL)
>> +		return NULL;
>> +
>> +	TAILQ_FOREACH(devargs, &devargs_list, next) {
>> +		switch (devtype) {
>> +		case RTE_DEVTYPE_WHITELISTED_PCI:
>> +		case RTE_DEVTYPE_BLACKLISTED_PCI:
>> +			if (eal_compare_pci_addr(&devargs->pci.addr, args) == 0)
>> +				goto found;
>> +			break;
>> +		case RTE_DEVTYPE_VIRTUAL:
>> +			if (memcmp(&devargs->virtual.drv_name, args,
>> +			    strlen((char *)args)) == 0)
>> +				goto found;
>> +			break;
>> +		}
>> +	}
>> +	return NULL;
>> +found:
>> +	return devargs;
>> +}
>> +
>>  /* store a whitelist parameter for later parsing */
>>  int
>>  rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
>> @@ -87,6 +116,12 @@ rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
>>  			free(devargs);
>>  			return -1;
>>  		}
>> +		/* make sure there is no same entry */
>> +		if (rte_eal_devargs_find(devtype, &devargs->pci.addr)) {
>> +			RTE_LOG(ERR, EAL,
>> +				"device already registered: <%s>\n", buf);
>> +			return -1;
>> +		}
>>  		break;
>>  	case RTE_DEVTYPE_VIRTUAL:
>>  		/* save driver name */
>> @@ -98,6 +133,12 @@ rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
>>  			free(devargs);
>>  			return -1;
>>  		}
>> +		/* make sure there is no same entry */
>> +		if (rte_eal_devargs_find(devtype, &devargs->virtual.drv_name)) {
>> +			RTE_LOG(ERR, EAL,
>> +				"device already registered: <%s>\n", buf);
>> +			return -1;
>> +		}
>>  		break;
>>  	}
>>  
>> @@ -105,6 +146,22 @@ rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str)
>>  	return 0;
>>  }
>>  
>> +/* remove it from the devargs_list */
>> +void
>> +rte_eal_devargs_remove(enum rte_devtype devtype, void *args)
>> +{
>> +	struct rte_devargs *devargs;
>> +
>> +	if (args == NULL)
>> +		return;
>> +
>> +	devargs = rte_eal_devargs_find(devtype, args);
>> +	if (devargs == NULL)
> If  devargs == NULL, means not found, does it reasonable to ignore? Some
> error happens I think, at least you should print out some logs.

I appreciate your comment.
I agree with you. At least error message should be displayed.
I will change function definition to return a error code and fix caller
of the function.
Also I will add error message.

Thanks,
Tetsuya

> Thanks,
> Michael
>> +		return;
>> +
>> +	TAILQ_REMOVE(&devargs_list, devargs, next);
>> +}
>> +
>>  /* count the number of devices of a specified type */
>>  unsigned int
>>  rte_eal_devargs_type_count(enum rte_devtype devtype)
>> diff --git a/lib/librte_eal/common/include/rte_devargs.h b/lib/librte_eal/common/include/rte_devargs.h
>> index 9f9c98f..1066efd 100644
>> --- a/lib/librte_eal/common/include/rte_devargs.h
>> +++ b/lib/librte_eal/common/include/rte_devargs.h
>> @@ -123,6 +123,24 @@ extern struct rte_devargs_list devargs_list;
>>  int rte_eal_devargs_add(enum rte_devtype devtype, const char *devargs_str);
>>  
>>  /**
>> + * Remove a device from the user device list
>> + *
>> + * For PCI devices, the format of arguments string is "PCI_ADDR". It shouldn't
>> + * involves parameters for the device. Example: "08:00.1".
>> + *
>> + * For virtual devices, the format of arguments string is "DRIVER_NAME*". It
>> + * shouldn't involves parameters for the device. Example: "eth_ring". The
>> + * validity of the driver name is not checked by this function, it is done
>> + * when closing the drivers.
>> + *
>> + * @param devtype
>> + *   The type of the device.
>> + * @param name
>> + *   The name of the device.
>> + */
>> +void rte_eal_devargs_remove(enum rte_devtype devtype, void *args);
>> +
>> +/**
>>   * Count the number of user devices of a specified type
>>   *
>>   * @param devtype