Hi Michael,
On 2015/01/20 18:23, Qiu, Michael wrote:
> 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 at 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?
I appreciate your comment.
Yes, it should be. I will fix it in next version.
Thanks,
Tetsuya
> 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
