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From: santosh <santosh.shukla@caviumnetworks.com>
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Subject: Re: [dpdk-dev] [PATCH v3 04/11] linuxapp/eal_pci: get iommu class
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X-List-Received-Date: Fri, 14 Jul 2017 08:46:57 -0000
On Friday 14 July 2017 01:36 PM, Hemant Agrawal wrote:
> On 7/14/2017 1:25 PM, santosh wrote:
>> On Friday 14 July 2017 01:09 PM, Hemant Agrawal wrote:
>>
>>> On 7/11/2017 11:46 AM, Santosh Shukla wrote:
>>>> Get iommu class of PCI device on the bus and returns preferred iova
>>>> mapping mode for that bus.
>>>>
>>>> Algorithm for iova scheme selection for PCI bus:
>>>> 0. Look for device attached to vfio kdrv and has .drv_flag set
>>>> to RTE_PCI_DRV_NEED_IOVA_VA.
>>>> 1. Look for any device attached to UIO class of driver.
>>>> 2. Check for vfio-noiommu mode enabled.
>>>>
>>>> If 1) & 2) is false and 0) is true then select
>>>> mapping scheme as iova=va. Otherwise use default
>>>> mapping scheme (iova_pa).
>>>>
>>>> Signed-off-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
>>>> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
>>>> ---
>>>> v1 --> v2:
>>>> - Removed Linux version check in vfio_noiommu func. Refer [1].
>>>> - Extending autodetction logic for _iommu_class.
>>>> Refer [2].
>>>>
>>>> [1] https://www.mail-archive.com/dev@dpdk.org/msg70108.html
>>>> [2] https://www.mail-archive.com/dev@dpdk.org/msg70279.html
>>>>
>>>> lib/librte_eal/linuxapp/eal/eal_pci.c | 66 +++++++++++++++++++++++++
>>>> lib/librte_eal/linuxapp/eal/eal_vfio.c | 19 +++++++
>>>> lib/librte_eal/linuxapp/eal/eal_vfio.h | 4 ++
>>>> lib/librte_eal/linuxapp/eal/rte_eal_version.map | 1 +
>>>> 4 files changed, 90 insertions(+)
>>>>
>>>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
>>>> index 7d9e1a99b..573caa000 100644
>>>> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
>>>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
>>>> @@ -45,6 +45,7 @@
>>>> #include "eal_filesystem.h"
>>>> #include "eal_private.h"
>>>> #include "eal_pci_init.h"
>>>> +#include "eal_vfio.h"
>>>>
>>>> /**
>>>> * @file
>>>> @@ -488,6 +489,71 @@ rte_pci_scan(void)
>>>> return -1;
>>>> }
>>>>
>>>> +/*
>>>> + * Any one of the device bound to uio
>>>> + */
>>>> +static inline int
>>>> +pci_device_bound_uio(void)
>>>> +{
>>>> + struct rte_pci_device *dev = NULL;
>>>> +
>>>> + FOREACH_DEVICE_ON_PCIBUS(dev) {
>>>> + if (dev->kdrv == RTE_KDRV_IGB_UIO ||
>>>> + dev->kdrv == RTE_KDRV_UIO_GENERIC) {
>>>> + return 1;
>>>> + }
>>>> + }
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Any one of the device has iova as va
>>>> + */
>>>> +static inline int
>>>> +pci_device_has_iova_va(void)
>>>> +{
>>>> + struct rte_pci_device *dev = NULL;
>>>> + struct rte_pci_driver *drv = NULL;
>>>> +
>>>> + FOREACH_DRIVER_ON_PCIBUS(drv) {
>>>> + if (drv && drv->drv_flags & RTE_PCI_DRV_NEED_IOVA_VA) {
>>>> + FOREACH_DEVICE_ON_PCIBUS(dev) {
>>>> + if (dev->kdrv == RTE_KDRV_VFIO &&
>>>> + rte_pci_match(drv, dev))
>>>> + return 1;
>>>> + }
>>>> + }
>>>> + }
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/*
>>>> + * Get iommu class of PCI devices on the bus.
>>>> + */
>>>> +enum rte_iova_mode
>>>> +rte_pci_get_iommu_class(void)
>>>> +{
>>>> + bool is_vfio_noiommu_enabled;
>>>> + bool has_iova_va;
>>>> + bool is_bound_uio;
>>>> +
>>>> + has_iova_va = pci_device_has_iova_va();
>>>> + is_bound_uio = pci_device_bound_uio();
>>>> + is_vfio_noiommu_enabled = vfio_noiommu_is_enabled() == 1 ? 1 : 0;
>>>> +
>>>> + if (has_iova_va && !is_bound_uio && !is_vfio_noiommu_enabled)
>>>> + return RTE_IOVA_VA;
>>>> +
>>>
>>> PCI is generally present in all platform including dpaa2.
>>> There may not be any device found or available for dpdk usages in such cases. The PCI bus will still return RTE_IOVA_PA, which will make the system mode as PA.
>>>
>> That's the expected behavior. And implementation makes sure
>> that PCI_bus return default mode aka _PA if no-pci device found.
>>
>> Isn't code taking care of same?
>>
>
> I have attached a PCI device to the board. But it is being managed by kernel only.
>
> EAL: PCI device 0000:01:00.0 on NUMA socket 0
> EAL: probe driver: 8086:10d3 net_e1000_em
> EAL: Not managed by a supported kernel driver, skipped
>
> So, there are devices in the PCI list. But none of them is probed or being used by dpdk.
>
>
Therefore _pci_get_iommu_class scan result would be _PA, As no device bound to dpdk.
>> Let me walk through the code:
>>
>> has_iova_va = 0 (if no pci device then pci_device_has_iov_va() will return 0).
>>
>> And if (has_iova_va & ,,,) will fail therefore rte_pci_get_iommu_class() retuns RTE_IOVA_PA mode.
>> which is default mode. Right?
>>
> This will create issue for the 2nd bus, which is a VA bus. The combined mode will becomes '3', so the system mode will be PA.
>
Yes, If both modes detected at two different bus
then policy is to use default iova mapping mode across the buses(which is _pa).
Are you operating on two different mode like _pa for PCI-bus and _va for fslmc bus in dpaa2?
>>>> + if (has_iova_va) {
>>>> + if (is_vfio_noiommu_enabled)
>>>> + RTE_LOG(WARNING, EAL, "vfio-noiommu mode configured\n");
>>>> + if (is_bound_uio)
>>>> + RTE_LOG(WARNING, EAL, "Some device attached to UIO\n");
>>>> + }
>>>> +
>>>> + return RTE_IOVA_PA;
>>>> +}
>>>> +
>>>> /* Read PCI config space. */
>>>> int rte_pci_read_config(const struct rte_pci_device *device,
>>>> void *buf, size_t len, off_t offset)
>>>> diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.c b/lib/librte_eal/linuxapp/eal/eal_vfio.c
>>>> index 946df7e31..c8a97b7e7 100644
>>>> --- a/lib/librte_eal/linuxapp/eal/eal_vfio.c
>>>> +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.c
>>>> @@ -816,4 +816,23 @@ vfio_noiommu_dma_map(int __rte_unused vfio_container_fd)
>>>> return 0;
>>>> }
>>>>
>>>> +int
>>>> +vfio_noiommu_is_enabled(void)
>>>> +{
>>>> + int fd, ret, cnt __rte_unused;
>>>> + char c;
>>>> +
>>>> + ret = -1;
>>>> + fd = open(VFIO_NOIOMMU_MODE, O_RDONLY);
>>>> + if (fd < 0)
>>>> + return -1;
>>>> +
>>>> + cnt = read(fd, &c, 1);
>>>> + if (c == 'Y')
>>>> + ret = 1;
>>>> +
>>>> + close(fd);
>>>> + return ret;
>>>> +}
>>>> +
>>>> #endif
>>>> diff --git a/lib/librte_eal/linuxapp/eal/eal_vfio.h b/lib/librte_eal/linuxapp/eal/eal_vfio.h
>>>> index 5ff63e5d7..26ea8e119 100644
>>>> --- a/lib/librte_eal/linuxapp/eal/eal_vfio.h
>>>> +++ b/lib/librte_eal/linuxapp/eal/eal_vfio.h
>>>> @@ -150,6 +150,8 @@ struct vfio_config {
>>>> #define VFIO_NOIOMMU_GROUP_FMT "/dev/vfio/noiommu-%u"
>>>> #define VFIO_GET_REGION_ADDR(x) ((uint64_t) x << 40ULL)
>>>> #define VFIO_GET_REGION_IDX(x) (x >> 40)
>>>> +#define VFIO_NOIOMMU_MODE \
>>>> + "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode"
>>>>
>>>> /* DMA mapping function prototype.
>>>> * Takes VFIO container fd as a parameter.
>>>> @@ -210,6 +212,8 @@ int pci_vfio_is_enabled(void);
>>>>
>>>> int vfio_mp_sync_setup(void);
>>>>
>>>> +int vfio_noiommu_is_enabled(void);
>>>> +
>>>> #define SOCKET_REQ_CONTAINER 0x100
>>>> #define SOCKET_REQ_GROUP 0x200
>>>> #define SOCKET_CLR_GROUP 0x300
>>>> diff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>>>> index c91dd44c4..044f89c7c 100644
>>>> --- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>>>> +++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map
>>>> @@ -206,6 +206,7 @@ DPDK_17.08 {
>>>> rte_bus_find_by_device;
>>>> rte_bus_find_by_name;
>>>> rte_pci_match;
>>>> + rte_pci_get_iommu_class;
>>>>
>>>> } DPDK_17.05;
>>>>
>>>>
>>>
>>>
>>
>>
>
>