[v7,1/2] vfio: add get device info API
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Commit Message
This patch adds an API to support getting device information.
The driver can use the "rte_vfio_get_device_info" helper to get
device information from EAL.
Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
---
lib/eal/include/rte_vfio.h | 29 +++++++++++++++++++++++++++++
lib/eal/linux/eal_vfio.c | 27 +++++++++++++++++++++++++++
lib/eal/version.map | 3 +++
3 files changed, 59 insertions(+)
Comments
[AMD Official Use Only - General]
> -----Original Message-----
> From: Mingjin Ye <mingjinx.ye@intel.com>
> Sent: Wednesday, November 22, 2023 3:53 PM
> To: dev@dpdk.org
> Cc: qiming.yang@intel.com; Mingjin Ye <mingjinx.ye@intel.com>; Anatoly
> Burakov <anatoly.burakov@intel.com>
> Subject: [PATCH v7 1/2] vfio: add get device info API
>
> This patch adds an API to support getting device information.
>
> The driver can use the "rte_vfio_get_device_info" helper to get
> device information from EAL.
>
> Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
Acked-by: Nipun Gupta <nipun.gupta@amd.com>
On Nov 22, 2023, at 18:22, Mingjin Ye <mingjinx.ye@intel.com> wrote:
>
> External email: Use caution opening links or attachments
>
>
> This patch adds an API to support getting device information.
>
> The driver can use the "rte_vfio_get_device_info" helper to get
> device information from EAL.
>
> Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
> ---
> lib/eal/include/rte_vfio.h | 29 +++++++++++++++++++++++++++++
> lib/eal/linux/eal_vfio.c | 27 +++++++++++++++++++++++++++
> lib/eal/version.map | 3 +++
> 3 files changed, 59 insertions(+)
>
Comments not addressed:
https://mails.dpdk.org/archives/dev/2023-November/282200.html
/Chenbo
> -----Original Message-----
> From: Chenbo Xia <chenbox@nvidia.com>
> Sent: Wednesday, November 29, 2023 9:48 AM
> To: Ye, MingjinX <mingjinx.ye@intel.com>
> Cc: dev@dpdk.org; Yang, Qiming <qiming.yang@intel.com>; Burakov,
> Anatoly <anatoly.burakov@intel.com>
> Subject: Re: [PATCH v7 1/2] vfio: add get device info API
>
> On Nov 22, 2023, at 18:22, Mingjin Ye <mingjinx.ye@intel.com> wrote:
> >
> > External email: Use caution opening links or attachments
> >
> >
> > This patch adds an API to support getting device information.
> >
> > The driver can use the "rte_vfio_get_device_info" helper to get device
> > information from EAL.
> >
> > Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
> > ---
> > lib/eal/include/rte_vfio.h | 29 +++++++++++++++++++++++++++++
> > lib/eal/linux/eal_vfio.c | 27 +++++++++++++++++++++++++++
> > lib/eal/version.map | 3 +++
> > 3 files changed, 59 insertions(+)
> >
>
> Comments not addressed:
>
> https://mails.dpdk.org/archives/dev/2023-November/282200.html
Sorry for not responding in time.
Experimental API, no CC stable.
This API is used essentially the same as the rte_vfio_setup_device API.
Reference: https://patchwork.dpdk.org/project/dpdk/patch/20231122102232.108299-3-mingjinx.ye@intel.com/
/Mingjin
@@ -17,6 +17,8 @@ extern "C" {
#include <stdbool.h>
#include <stdint.h>
+#include <rte_compat.h>
+
/*
* determine if VFIO is present on the system
*/
@@ -239,6 +241,33 @@ int
rte_vfio_get_group_num(const char *sysfs_base,
const char *dev_addr, int *iommu_group_num);
+/**
+ * Get device information
+ *
+ * This function is only relevant to linux and will return
+ * an error on BSD.
+ *
+ * @param sysfs_base
+ * sysfs path prefix.
+ *
+ * @param dev_addr
+ * device location.
+ *
+ * @param vfio_dev_fd
+ * VFIO fd.
+ *
+ * @param device_info
+ * Device information.
+ *
+ * @return
+ * 0 on success.
+ * <0 on failure.
+ */
+__rte_experimental
+int
+rte_vfio_get_device_info(const char *sysfs_base, const char *dev_addr,
+ int *vfio_dev_fd, struct vfio_device_info *device_info);
+
/**
* Open a new VFIO container fd
*
@@ -1222,6 +1222,33 @@ vfio_set_iommu_type(int vfio_container_fd)
return NULL;
}
+int
+rte_vfio_get_device_info(const char *sysfs_base, const char *dev_addr,
+ int *vfio_dev_fd, struct vfio_device_info *device_info)
+{
+ int ret;
+
+ if (!device_info || *vfio_dev_fd < 0)
+ return -1;
+
+ if (*vfio_dev_fd == 0) {
+ ret = rte_vfio_setup_device(sysfs_base, dev_addr,
+ vfio_dev_fd, device_info);
+ if (ret)
+ return -1;
+ } else {
+ ret = ioctl(*vfio_dev_fd, VFIO_DEVICE_GET_INFO, device_info);
+ if (ret) {
+ RTE_LOG(ERR, EAL, "%s cannot get device info, "
+ "error %i (%s)\n", dev_addr, errno,
+ strerror(errno));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
int
vfio_has_supported_extensions(int vfio_container_fd)
{
@@ -393,6 +393,9 @@ EXPERIMENTAL {
# added in 23.07
rte_memzone_max_get;
rte_memzone_max_set;
+
+ # added in 23.11
+ rte_vfio_get_device_info; # WINDOWS_NO_EXPORT
};
INTERNAL {