Add bus master enable/disable APIs for CDX devices
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Commit Message
From: Shubham Rohila <shubham.rohila@amd.com>
Define rte_cdx_vfio_bm_enable and rte_cdx_vfio_bm_disable to
enable or disable bus master functionality for cdx devices.
Signed-off-by: Shubham Rohila <shubham.rohila@amd.com>
---
drivers/bus/cdx/bus_cdx_driver.h | 25 ++++++++
drivers/bus/cdx/cdx_vfio.c | 97 ++++++++++++++++++++++++++++++++
drivers/bus/cdx/version.map | 2 +
lib/eal/include/rte_vfio.h | 27 +++++++++
4 files changed, 151 insertions(+)
Comments
On 10/27/2023 5:22 PM, Ferruh Yigit wrote:
> From: Shubham Rohila <shubham.rohila@amd.com>
>
> Define rte_cdx_vfio_bm_enable and rte_cdx_vfio_bm_disable to
> enable or disable bus master functionality for cdx devices.
>
> Signed-off-by: Shubham Rohila <shubham.rohila@amd.com>
>
Note: this is re-sent on behalf of Shubham to record the patch, since
the original one is not available in the mail list somehow.
@@ -16,6 +16,7 @@ extern "C" {
#include <stdlib.h>
#include <inttypes.h>
+#include <linux/types.h>
#include <bus_driver.h>
#include <dev_driver.h>
@@ -178,6 +179,30 @@ int rte_cdx_vfio_intr_enable(const struct rte_intr_handle *intr_handle);
__rte_internal
int rte_cdx_vfio_intr_disable(const struct rte_intr_handle *intr_handle);
+/**
+ * Enable Bus Mastering for CDX bus devices.
+ *
+ * @param dev
+ * Pointer to the cdx device.
+ *
+ * @return
+ * 0 on success, -1 on error.
+ */
+__rte_internal
+int rte_cdx_vfio_bm_enable(struct rte_cdx_device *dev);
+
+/**
+ * Disable Bus Mastering for CDX bus devices.
+ *
+ * @param dev
+ * Pointer to the cdx device.
+ *
+ * @return
+ * 0 on success, -1 on error.
+ */
+__rte_internal
+int rte_cdx_vfio_bm_disable(struct rte_cdx_device *dev);
+
/**
* Unregister a CDX driver.
*
@@ -256,6 +256,16 @@ cdx_vfio_setup_device(struct rte_cdx_device *dev, int vfio_dev_fd,
return -1;
}
+ /*
+ * Enable Bus mastering for the device. errno is set as ENOTTY if
+ * device does not support configuring bus master.
+ */
+ if (rte_cdx_vfio_bm_enable(dev) && errno != -ENOTTY) {
+ CDX_BUS_ERR("Bus master enable failure! Error: %d (%s)", errno,
+ strerror(errno));
+ return -1;
+ }
+
return 0;
}
@@ -596,3 +606,90 @@ rte_cdx_vfio_intr_disable(const struct rte_intr_handle *intr_handle)
return ret;
}
+
+/* enable Bus Mastering */
+int
+rte_cdx_vfio_bm_enable(struct rte_cdx_device *dev)
+{
+ struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
+ struct vfio_device_feature_bus_master *vfio_bm_feature;
+ struct vfio_device_feature *feature;
+ int vfio_dev_fd, ret = 0;
+ size_t argsz = 0;
+
+ vfio_dev_fd = rte_intr_dev_fd_get(dev->intr_handle);
+ if (vfio_dev_fd < 0)
+ return -1;
+
+ argsz = sizeof(struct vfio_device_feature) + sizeof(struct vfio_device_feature_bus_master);
+
+ feature = (struct vfio_device_feature *)malloc(argsz);
+ if (!feature)
+ return -ENOMEM;
+
+ vfio_bm_feature = (struct vfio_device_feature_bus_master *) feature->data;
+
+ feature->argsz = argsz;
+
+ feature->flags = RTE_VFIO_DEVICE_FEATURE_BUS_MASTER | VFIO_DEVICE_FEATURE_PROBE;
+ feature->flags |= VFIO_DEVICE_FEATURE_SET;
+ ret = ioctl(vfio_dev_fd, RTE_VFIO_DEVICE_FEATURE, feature);
+ if (ret) {
+ CDX_BUS_ERR("Bus Master configuring not supported for device: %s, error: %d (%s)\n",
+ dev->name, errno, strerror(errno));
+ free(feature);
+ return ret;
+ }
+
+ feature->flags = RTE_VFIO_DEVICE_FEATURE_BUS_MASTER | VFIO_DEVICE_FEATURE_SET;
+ vfio_bm_feature->op = VFIO_DEVICE_FEATURE_SET_MASTER;
+ ret = ioctl(vfio_dev_fd, RTE_VFIO_DEVICE_FEATURE, feature);
+ if (ret < 0)
+ CDX_BUS_ERR("BM Enable Error for device: %s, Error: %d (%s)\n",
+ dev->name, errno, strerror(errno));
+
+ free(feature);
+ return ret;
+}
+
+/* Disable Bus Mastering */
+int
+rte_cdx_vfio_bm_disable(struct rte_cdx_device *dev)
+{
+ struct vfio_device_feature_bus_master *vfio_bm_feature;
+ struct vfio_device_feature *feature;
+ int vfio_dev_fd, ret = 0;
+ size_t argsz = 0;
+
+ vfio_dev_fd = rte_intr_dev_fd_get(dev->intr_handle);
+ if (vfio_dev_fd < 0)
+ return -1;
+
+ feature = (struct vfio_device_feature *)malloc(argsz);
+ if (!feature)
+ return -ENOMEM;
+
+ vfio_bm_feature = (struct vfio_device_feature_bus_master *) feature->data;
+
+ feature->argsz = argsz;
+
+ feature->flags = RTE_VFIO_DEVICE_FEATURE_BUS_MASTER | VFIO_DEVICE_FEATURE_PROBE;
+ feature->flags |= VFIO_DEVICE_FEATURE_SET;
+ ret = ioctl(vfio_dev_fd, RTE_VFIO_DEVICE_FEATURE, feature);
+ if (ret) {
+ CDX_BUS_ERR("Bus Master configuring not supported for device: %s, Error: %d (%s)\n",
+ dev->name, errno, strerror(errno));
+ free(feature);
+ return ret;
+ }
+
+ feature->flags = RTE_VFIO_DEVICE_FEATURE_BUS_MASTER | VFIO_DEVICE_FEATURE_SET;
+ vfio_bm_feature->op = VFIO_DEVICE_FEATURE_CLEAR_MASTER;
+ ret = ioctl(vfio_dev_fd, RTE_VFIO_DEVICE_FEATURE, feature);
+ if (ret < 0)
+ CDX_BUS_ERR("BM Disable Error for device: %s, Error: %d (%s)\n",
+ dev->name, errno, strerror(errno));
+
+ free(feature);
+ return ret;
+}
@@ -7,6 +7,8 @@ INTERNAL {
rte_cdx_unregister;
rte_cdx_vfio_intr_disable;
rte_cdx_vfio_intr_enable;
+ rte_cdx_vfio_bm_enable;
+ rte_cdx_vfio_bm_disable;
local: *;
};
@@ -73,6 +73,33 @@ struct vfio_info_cap_header {
#define RTE_VFIO_CAP_MSIX_MAPPABLE 3
#endif
+/* VFIO_DEVICE_FEATURE is defined for kernel version 5.7 and newer. */
+#ifdef VFIO_DEVICE_FEATURE
+#define RTE_VFIO_DEVICE_FEATURE VFIO_DEVICE_FEATURE
+#else
+#define RTE_VFIO_DEVICE_FEATURE _IO(VFIO_TYPE, VFIO_BASE + 17)
+struct vfio_device_feature {
+ __u32 argsz;
+ __u32 flags;
+#define VFIO_DEVICE_FEATURE_MASK (0xffff) /* 16-bit feature index */
+#define VFIO_DEVICE_FEATURE_GET (1 << 16) /* Get feature into data[] */
+#define VFIO_DEVICE_FEATURE_SET (1 << 17) /* Set feature from data[] */
+#define VFIO_DEVICE_FEATURE_PROBE (1 << 18) /* Probe feature support */
+ __u8 data[];
+};
+#endif
+
+#ifdef VFIO_DEVICE_FEATURE_BUS_MASTER
+#define RTE_VFIO_DEVICE_FEATURE_BUS_MASTER VFIO_DEVICE_FEATURE_BUS_MASTER
+#else
+#define RTE_VFIO_DEVICE_FEATURE_BUS_MASTER 10
+struct vfio_device_feature_bus_master {
+ __u32 op;
+#define VFIO_DEVICE_FEATURE_CLEAR_MASTER 0 /* Clear Bus Master */
+#define VFIO_DEVICE_FEATURE_SET_MASTER 1 /* Set Bus Master */
+};
+#endif
+
#else /* not VFIO_PRESENT */
/* we don't need an actual definition, only pointer is used */