diff mbox series

vfio: add get device info API

Message ID 20231114102300.409158-1-mingjinx.ye@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series vfio: add get device info API |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/loongarch-compilation fail ninja build failure
ci/Intel-compilation fail Compilation issues

Commit Message

Mingjin Ye Nov. 14, 2023, 10:23 a.m. UTC 
  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.

Cc: stable@dpdk.org

Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
---
 lib/eal/include/rte_vfio.h | 26 ++++++++++++++++++++++++++
 lib/eal/linux/eal_vfio.c   | 19 +++++++++++++++++++
 lib/eal/version.map        |  3 +++
 3 files changed, 48 insertions(+)

Comments

Chenbo Xia Nov. 15, 2023, 6:13 a.m. UTC | #1 
> On Nov 14, 2023, at 18:23, 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.
> 
> Cc: stable@dpdk.org

No stable

Please explain why this api is needed in your use case. Taking this with
the use-case patch could be more clear.

Thanks,
Chenbo

> 
> Signed-off-by: Mingjin Ye <mingjinx.ye@intel.com>
> ---
> lib/eal/include/rte_vfio.h | 26 ++++++++++++++++++++++++++
> lib/eal/linux/eal_vfio.c   | 19 +++++++++++++++++++
> lib/eal/version.map        |  3 +++
> 3 files changed, 48 insertions(+)
diff mbox series

Patch

diff --git a/lib/eal/include/rte_vfio.h b/lib/eal/include/rte_vfio.h
index 3487c4f2a2..b3f55963e3 100644
--- a/lib/eal/include/rte_vfio.h
+++ b/lib/eal/include/rte_vfio.h
@@ -212,6 +212,32 @@  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.
+ */
+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
  *
diff --git a/lib/eal/linux/eal_vfio.c b/lib/eal/linux/eal_vfio.c
index ad3c1654b2..5810d9fcd7 100644
--- a/lib/eal/linux/eal_vfio.c
+++ b/lib/eal/linux/eal_vfio.c
@@ -1222,6 +1222,25 @@  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)
+{
+	if (!device_info || *vfio_dev_fd < 0)
+		return -1;
+
+	if (*vfio_dev_fd == 0) {
+		if (rte_vfio_setup_device(sysfs_base, dev_addr,
+				vfio_dev_fd, device_info))
+			return -1;
+	} else {
+		if (ioctl(*vfio_dev_fd, VFIO_DEVICE_GET_INFO, &device_info))
+			return -1;
+	}
+
+	return 0;
+}
+
 int
 vfio_has_supported_extensions(int vfio_container_fd)
 {
diff --git a/lib/eal/version.map b/lib/eal/version.map
index e00a844805..8a211aaefd 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -413,6 +413,9 @@  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 {