The kernel module vfio-pci introduces the VF token to enable SR-IOV
support.
The VF token can be set by a vfio-pci based PF driver and must be known
by the vfio-pci based VF driver in order to gain access to the device.
An example VF token option would take this form:
1. ./usertools/dpdk-devbind.py -b vfio-pci 0000:87:00.0
2. echo 2 > /sys/bus/pci/devices/0000:87:00.0/sriov_numvfs
3. Start the PF:
./x86_64-native-linux-gcc/app/testpmd -l 22-25 -n 4 \
-w 87:00.0,vf_token=2ab74924-c335-45f4-9b16-8569e5b08258 \
--file-prefix=pf -- -i
4. Start the VF:
./x86_64-native-linux-gcc/app/testpmd -l 26-29 -n 4 \
-w 87:02.0,vf_token=2ab74924-c335-45f4-9b16-8569e5b08258 \
--file-prefix=vf1 -- -i
Test based on vfio-pci patch: https://patchwork.ozlabs.org/cover/1253222/
Signed-off-by: Haiyue Wang <haiyue.w...@intel.com>
---
Based on RFC v1: https://patchwork.dpdk.org/patch/66281/
---
drivers/bus/pci/linux/pci_vfio.c | 56 +++++++++++++++++++++++++++++--
lib/librte_eal/freebsd/eal.c | 3 +-
lib/librte_eal/include/rte_vfio.h | 8 ++++-
lib/librte_eal/linux/eal_vfio.c | 20 +++++++++--
4 files changed, 80 insertions(+), 7 deletions(-)
diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index 64cd84a68..7f99337c7 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -11,6 +11,7 @@
#include <sys/mman.h>
#include <stdbool.h>
+#include <rte_devargs.h>
#include <rte_log.h>
#include <rte_pci.h>
#include <rte_bus_pci.h>
@@ -644,11 +645,59 @@ pci_vfio_msix_is_mappable(int vfio_dev_fd, int
msix_region)
return ret;
}
+static void
+vfio_pci_vf_token_arg(struct rte_devargs *devargs, rte_uuid_t uu)
+{
+#define VF_TOKEN_ARG "vf_token="
+ char c, *p, *vf_token;
+
+ if (devargs == NULL)
+ return;
+
+ p = strstr(devargs->args, VF_TOKEN_ARG);
+ if (!p)
+ return;
+
+ vf_token = p + strlen(VF_TOKEN_ARG);
+ if (strlen(vf_token) < (RTE_UUID_STRLEN - 1))
+ return;
+
+ c = vf_token[RTE_UUID_STRLEN - 1];
+ if (c != '\0' && c != ',')
+ return;
+
+ vf_token[RTE_UUID_STRLEN - 1] = '\0';
+ if (rte_uuid_parse(vf_token, uu)) {
+ RTE_LOG(ERR, EAL,
+ "The VF token is not a valid uuid : %s\n", vf_token);
+ vf_token[RTE_UUID_STRLEN - 1] = c;
+ return;
+ }
+
+ RTE_LOG(DEBUG, EAL,
+ "The VF token is found : %s\n", vf_token);
+
+ vf_token[RTE_UUID_STRLEN - 1] = c;
+
+ /* Purge this vfio-pci specific token from the device arguments */
+ if (c != '\0') {
+ /* 1. Handle the case : 'vf_token=uuid,arg1=val1' */
+ memmove(p, vf_token + RTE_UUID_STRLEN,
+ strlen(vf_token + RTE_UUID_STRLEN) + 1);
+ } else {
+ /* 2. Handle the case : 'arg1=val1,vf_token=uuid' */
+ if (p != devargs->args)
+ p--;
+
+ *p = '\0';
+ }
+}
static int
pci_vfio_map_resource_primary(struct rte_pci_device *dev)
{
struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
+ rte_uuid_t vf_token = RTE_UUID_INIT(0, 0, 0, 0, 0ULL);
char pci_addr[PATH_MAX] = {0};
int vfio_dev_fd;
struct rte_pci_addr *loc = &dev->addr;
@@ -668,8 +717,9 @@ pci_vfio_map_resource_primary(struct rte_pci_device *dev)
snprintf(pci_addr, sizeof(pci_addr), PCI_PRI_FMT,
loc->domain, loc->bus, loc->devid, loc->function);
+ vfio_pci_vf_token_arg(dev->device.devargs, vf_token);
ret = rte_vfio_setup_device(rte_pci_get_sysfs_path(), pci_addr,
- &vfio_dev_fd, &device_info);
+ &vfio_dev_fd, &device_info, vf_token);
if (ret)
return ret;
@@ -797,6 +847,7 @@ static int
pci_vfio_map_resource_secondary(struct rte_pci_device *dev)
{
struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
+ rte_uuid_t vf_token = RTE_UUID_INIT(0, 0, 0, 0, 0ULL);
char pci_addr[PATH_MAX] = {0};
int vfio_dev_fd;
struct rte_pci_addr *loc = &dev->addr;
@@ -830,8 +881,9 @@ pci_vfio_map_resource_secondary(struct rte_pci_device *dev)
return -1;
}
+ vfio_pci_vf_token_arg(dev->device.devargs, vf_token);
ret = rte_vfio_setup_device(rte_pci_get_sysfs_path(), pci_addr,
- &vfio_dev_fd, &device_info);
+ &vfio_dev_fd, &device_info, vf_token);
if (ret)
return ret;
diff --git a/lib/librte_eal/freebsd/eal.c b/lib/librte_eal/freebsd/eal.c
index 6ae37e7e6..cbb4c400e 100644
--- a/lib/librte_eal/freebsd/eal.c
+++ b/lib/librte_eal/freebsd/eal.c
@@ -995,7 +995,8 @@ rte_eal_vfio_intr_mode(void)
int rte_vfio_setup_device(__rte_unused const char *sysfs_base,
__rte_unused const char *dev_addr,
__rte_unused int *vfio_dev_fd,
- __rte_unused struct vfio_device_info *device_info)
+ __rte_unused struct vfio_device_info *device_info
+ __rte_unused rte_uuid_t vf_token)
{
return -1;
}
diff --git a/lib/librte_eal/include/rte_vfio.h
b/lib/librte_eal/include/rte_vfio.h
index 20ed8c45a..1f9e22d82 100644
--- a/lib/librte_eal/include/rte_vfio.h
+++ b/lib/librte_eal/include/rte_vfio.h
@@ -16,6 +16,8 @@ extern "C" {
#include <stdint.h>
+#include <rte_uuid.h>
+
/*
* determine if VFIO is present on the system
*/
@@ -102,13 +104,17 @@ struct vfio_device_info;
* @param device_info
* Device information.
*
+ * @param vf_token
+ * VF token.
+ *
* @return
* 0 on success.
* <0 on failure.
* >1 if the device cannot be managed this way.
*/
int rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
- int *vfio_dev_fd, struct vfio_device_info *device_info);
+ int *vfio_dev_fd, struct vfio_device_info *device_info,
+ rte_uuid_t vf_token);
/**
* Release a device mapped to a VFIO-managed I/O MMU group.
diff --git a/lib/librte_eal/linux/eal_vfio.c b/lib/librte_eal/linux/eal_vfio.c
index 4502aefed..8c0ad04e5 100644
--- a/lib/librte_eal/linux/eal_vfio.c
+++ b/lib/librte_eal/linux/eal_vfio.c
@@ -702,7 +702,8 @@ rte_vfio_clear_group(int vfio_group_fd)
int
rte_vfio_setup_device(const char *sysfs_base, const char *dev_addr,
- int *vfio_dev_fd, struct vfio_device_info *device_info)
+ int *vfio_dev_fd, struct vfio_device_info *device_info,
+ rte_uuid_t vf_token)
{
struct vfio_group_status group_status = {
.argsz = sizeof(group_status)
@@ -712,6 +713,7 @@ rte_vfio_setup_device(const char *sysfs_base, const char
*dev_addr,
int vfio_container_fd;
int vfio_group_fd;
int iommu_group_num;
+ char dev[PATH_MAX];
int i, ret;
/* get group number */
@@ -895,8 +897,19 @@ rte_vfio_setup_device(const char *sysfs_base, const char
*dev_addr,
t->type_id, t->name);
}
+ if (!rte_uuid_is_null(vf_token)) {
+ char vf_token_str[RTE_UUID_STRLEN];
+
+ rte_uuid_unparse(vf_token, vf_token_str, sizeof(vf_token_str));
+ snprintf(dev, sizeof(dev),
+ "%s vf_token=%s", dev_addr, vf_token_str);
+ } else {
+ snprintf(dev, sizeof(dev),
+ "%s", dev_addr);
+ }
+
/* get a file descriptor for the device */
- *vfio_dev_fd = ioctl(vfio_group_fd, VFIO_GROUP_GET_DEVICE_FD, dev_addr);
+ *vfio_dev_fd = ioctl(vfio_group_fd, VFIO_GROUP_GET_DEVICE_FD, dev);
if (*vfio_dev_fd < 0) {
/* if we cannot get a device fd, this implies a problem with
* the VFIO group or the container not having IOMMU configured.
@@ -2081,7 +2094,8 @@ int
rte_vfio_setup_device(__rte_unused const char *sysfs_base,
__rte_unused const char *dev_addr,
__rte_unused int *vfio_dev_fd,
- __rte_unused struct vfio_device_info *device_info)
+ __rte_unused struct vfio_device_info *device_info
+ __rte_unused rte_uuid_t vf_token)
{
return -1;
}
--
2.26.0
