Re: [dpdk-dev] [PATCH v4 06/11] eal/linux/pci: Add functions for unmapping igb_uio resources

["Qiu, Michael" <michael.qiu@intel.com>]

On 1/19/2015 6:42 PM, Tetsuya Mukawa wrote:
> 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.
>
> v4:
> - Add paramerter 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           | 38 +++++++++++++++
>  lib/librte_eal/linuxapp/eal/eal_pci_init.h      |  8 +++
>  lib/librte_eal/linuxapp/eal/eal_pci_uio.c       | 65 +++++++++++++++++++++++++
>  5 files changed, 156 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)

As you said, VFIO should not work with it, so does it need to add the
vfio check here?

Thanks,
Michael
> +#define ENABLE_HOTPLUG
> +#endif /* RTE_LIBRTE_EAL_HOTPLUG & RTE_LIBRTE_EAL_LINUXAPP */
> +
> +#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 3d2d93c..52c464c 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
> @@ -137,6 +137,25 @@ pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size)
>  	return mapaddr;
>  }
>  
> +#ifdef ENABLE_HOTPLUG
> +/* 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 mapped at %p\n",
> +				requested_addr);
> +}
> +#endif /* ENABLE_HOTPLUG */
> +
>  /* parse the "resource" sysfs file */
>  #define IORESOURCE_MEM  0x00000200
>  
> @@ -510,6 +529,25 @@ pci_map_device(struct rte_pci_device *dev)
>  	return 0;
>  }
>  
> +#ifdef ENABLE_HOTPLUG
> +static void
> +pci_unmap_device(struct rte_pci_device *dev)
> +{
> +	if (dev == NULL)
> +		return;
> +
> +	/* try unmapping the NIC resources using VFIO if it exists */
> +#ifdef VFIO_PRESENT
> +	if (pci_vfio_is_enabled()) {
> +		RTE_LOG(ERR, EAL, "%s() doesn't support vfio yet.\n",
> +				__func__);
> +		return;
> +	}
> +#endif
> +	pci_uio_unmap_resource(dev);
> +}
> +#endif /* ENABLE_HOTPLUG */
> +
>  /*
>   * If vendor/device ID match, call the devinit() function of the
>   * driver.
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_init.h b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
> index 1070eb8..5152a0b 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci_init.h
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci_init.h
> @@ -34,6 +34,7 @@
>  #ifndef EAL_PCI_INIT_H_
>  #define EAL_PCI_INIT_H_
>  
> +#include <rte_dev_hotplug.h>
>  #include "eal_vfio.h"
>  
>  struct pci_map {
> @@ -71,6 +72,13 @@ void *pci_map_resource(void *requested_addr, int fd, off_t offset,
>  /* map IGB_UIO resource prototype */
>  int pci_uio_map_resource(struct rte_pci_device *dev);
>  
> +#ifdef ENABLE_HOTPLUG
> +void pci_unmap_resource(void *requested_addr, size_t size);
> +
> +/* unmap IGB_UIO resource prototype */
> +void pci_uio_unmap_resource(struct rte_pci_device *dev);
> +#endif /* ENABLE_HOTPLUG */
> +
>  #ifdef VFIO_PRESENT
>  
>  #define VFIO_MAX_GROUPS 64
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> index 1da3507..81830d1 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci_uio.c
> @@ -404,6 +404,71 @@ pci_uio_map_resource(struct rte_pci_device *dev)
>  	return 0;
>  }
>  
> +#ifdef ENABLE_HOTPLUG
> +static void
> +pci_uio_unmap(struct mapped_pci_resource *uio_res)
> +{
> +	int i;
> +
> +	if (uio_res == NULL)
> +		return;
> +
> +	for (i = 0; i != uio_res->nb_maps; i++)
> +		pci_unmap_resource(uio_res->maps[i].addr,
> +				(size_t)uio_res->maps[i].size);
> +}
> +
> +static struct mapped_pci_resource *
> +pci_uio_find_resource(struct rte_pci_device *dev)
> +{
> +	struct mapped_pci_resource *uio_res;
> +
> +	if (dev == NULL)
> +		return NULL;
> +
> +	TAILQ_FOREACH(uio_res, pci_res_list, next) {
> +
> +		/* skip this element if it doesn't match our PCI address */
> +		if (!eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
> +			return uio_res;
> +	}
> +	return NULL;
> +}
> +
> +/* unmap the PCI resource of a PCI device in virtual memory */
> +void
> +pci_uio_unmap_resource(struct rte_pci_device *dev)
> +{
> +	struct mapped_pci_resource *uio_res;
> +
> +	if (dev == NULL)
> +		return;
> +
> +	/* find an entry for the device */
> +	uio_res = pci_uio_find_resource(dev);
> +	if (uio_res == NULL)
> +		return;
> +
> +	/* secondary processes - just free maps */
> +	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> +		return pci_uio_unmap(uio_res);
> +
> +	TAILQ_REMOVE(pci_res_list, uio_res, next);
> +
> +	/* unmap all resources */
> +	pci_uio_unmap(uio_res);
> +
> +	/* free uio resource */
> +	rte_free(uio_res);
> +
> +	/* close fd if in primary process */
> +	close(dev->intr_handle.fd);
> +
> +	dev->intr_handle.fd = -1;
> +	dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
> +}
> +#endif /* ENABLE_HOTPLUG */
> +
>  /*
>   * parse a sysfs file containing one integer value
>   * different to the eal version, as it needs to work with 64-bit values