Re: [dpdk-dev] [PATCH v8 08/14] eal/linux/pci: Add functions for unmapping igb_uio resources

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

On 2015/02/17 10:11, Thomas Monjalon wrote:
> 2015-02-16 13:14, Tetsuya Mukawa:
>> The patch adds functions for unmapping igb_uio resources. The patch is only
>> for Linux and igb_uio environment. VFIO and BSD are not supported.
>>
>> v8:
>> - Fix typo.
>>   (Thanks to Iremonger, Bernard)
>> v5:
>> - Fix pci_unmap_device() to check pt_driver.
>> v4:
>> - Add parameter checking.
>> - Add header file to determine if hotplug can be enabled.
>>
>> Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
>> ---
>>  lib/librte_eal/common/Makefile                  |  1 +
>>  lib/librte_eal/common/include/rte_dev_hotplug.h | 44 +++++++++++++++++
>>  lib/librte_eal/linuxapp/eal/eal_pci.c           | 44 +++++++++++++++++
>>  lib/librte_eal/linuxapp/eal/eal_pci_init.h      |  8 +++
>>  lib/librte_eal/linuxapp/eal/eal_pci_uio.c       | 65 +++++++++++++++++++++++++
>>  5 files changed, 162 insertions(+)
>>  create mode 100644 lib/librte_eal/common/include/rte_dev_hotplug.h
>>
>> diff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile
>> index 52c1a5f..db7cc93 100644
>> --- a/lib/librte_eal/common/Makefile
>> +++ b/lib/librte_eal/common/Makefile
>> @@ -41,6 +41,7 @@ INC += rte_eal_memconfig.h rte_malloc_heap.h
>>  INC += rte_hexdump.h rte_devargs.h rte_dev.h
>>  INC += rte_common_vect.h
>>  INC += rte_pci_dev_feature_defs.h rte_pci_dev_features.h
>> +INC += rte_dev_hotplug.h
>>  
>>  ifeq ($(CONFIG_RTE_INSECURE_FUNCTION_WARNING),y)
>>  INC += rte_warnings.h
>> diff --git a/lib/librte_eal/common/include/rte_dev_hotplug.h b/lib/librte_eal/common/include/rte_dev_hotplug.h
>> new file mode 100644
>> index 0000000..b333e0f
>> --- /dev/null
>> +++ b/lib/librte_eal/common/include/rte_dev_hotplug.h
>> @@ -0,0 +1,44 @@
>> +/*-
>> + *   BSD LICENSE
>> + *
>> + *   Copyright(c) 2015 IGEL Co.,LTd.
>> + *   All rights reserved.
>> + *
>> + *   Redistribution and use in source and binary forms, with or without
>> + *   modification, are permitted provided that the following conditions
>> + *   are met:
>> + *
>> + *     * Redistributions of source code must retain the above copyright
>> + *       notice, this list of conditions and the following disclaimer.
>> + *     * Redistributions in binary form must reproduce the above copyright
>> + *       notice, this list of conditions and the following disclaimer in
>> + *       the documentation and/or other materials provided with the
>> + *       distribution.
>> + *     * Neither the name of IGEL Co.,Ltd. nor the names of its
>> + *       contributors may be used to endorse or promote products derived
>> + *       from this software without specific prior written permission.
>> + *
>> + *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
>> + *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
>> + *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
>> + *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
>> + *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
>> + *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
>> + *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
>> + *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
>> + *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>> + *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>> + *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>> + */
>> +
>> +#ifndef _RTE_DEV_HOTPLUG_H_
>> +#define _RTE_DEV_HOTPLUG_H_
>> +
>> +/*
>> + * determine if hotplug can be enabled on the system
>> + */
>> +#if defined(RTE_LIBRTE_EAL_HOTPLUG) && defined(RTE_LIBRTE_EAL_LINUXAPP)
>> +#define ENABLE_HOTPLUG
>> +#endif /* RTE_LIBRTE_EAL_HOTPLUG & RTE_LIBRTE_EAL_LINUXAPP */
> Please no.
> You just have to set the build option to no in the default BSD config file
> with a comment explaining it is not supported.

OK, I will change like you said.

>> +
>> +#endif /* _RTE_DEV_HOTPLUG_H_ */
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> index 2d5f6a6..72a1362 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> @@ -167,6 +167,25 @@ pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size)
>>  	return mapaddr;
>>  }
>>  
>> +#ifdef ENABLE_HOTPLUG
> Please avoid using #ifdef if not really necessary.

I agree with you.
In this case, only hotplug functions call pci_unmap_resource().
So this will be needed.

>> +/* unmap a particular resource */
>> +void
>> +pci_unmap_resource(void *requested_addr, size_t size)
>> +{
>> +	if (requested_addr == NULL)
>> +		return;
>> +
>> +	/* Unmap the PCI memory resource of device */
>> +	if (munmap(requested_addr, size)) {
>> +		RTE_LOG(ERR, EAL, "%s(): cannot munmap(%p, 0x%lx): %s\n",
>> +			__func__, requested_addr, (unsigned long)size,
>> +			strerror(errno));
>> +	} else
>> +		RTE_LOG(DEBUG, EAL, "  PCI memory unmapped at %p\n",
>> +				requested_addr);
>> +}
>> +#endif /* ENABLE_HOTPLUG */
>> +
>>  /* parse the "resource" sysfs file */
>>  #define IORESOURCE_MEM  0x00000200
> [...]