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authorJan Viktorin <viktorin@rehivetech.com>2016-07-04 17:16:45 +0200
committerThomas Monjalon <thomas.monjalon@6wind.com>2016-07-11 13:37:12 +0200
commit0747689b56307876aecf9377f608ef6441a0cee5 (patch)
treec7f6f8c5d1801afa6147678fb137b1380b49705b /lib
parentc073a585a09c1e9a1712270055e3477b616ab016 (diff)
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vfio: extract setup logic out of resource mapping
The setup logic access the global vfio_cfg variable that will be moved in the following commits. We need to separate all accesses to this variable to a general code. Signed-off-by: Jan Viktorin <viktorin@rehivetech.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/librte_eal/linuxapp/eal/eal_pci_vfio.c85
1 files changed, 49 insertions, 36 deletions
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
index c2ff465..2792c23 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci_vfio.c
@@ -411,37 +411,22 @@ clear_current_group(void)
vfio_cfg.vfio_groups[vfio_cfg.vfio_group_idx].fd = -1;
}
-
-/*
- * map the PCI resources of a PCI device in virtual memory (VFIO version).
- * primary and secondary processes follow almost exactly the same path
+/**
+ * Setup vfio_cfg for the device indentified by its address. It discovers
+ * the configured I/O MMU groups or sets a new one for the device. If a new
+ * groups is assigned, the DMA mapping is performed.
+ * Returns 0 on success, a negative value on failure and a positive value in
+ * case the given device cannot be managed this way.
*/
-int
-pci_vfio_map_resource(struct rte_pci_device *dev)
+static int pci_vfio_setup_device(const char *pci_addr, int *vfio_dev_fd,
+ struct vfio_device_info *device_info)
{
struct vfio_group_status group_status = {
.argsz = sizeof(group_status)
};
- struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
- int vfio_group_fd, vfio_dev_fd;
+ int vfio_group_fd;
int iommu_group_no;
- char pci_addr[PATH_MAX] = {0};
- struct rte_pci_addr *loc = &dev->addr;
- int i, ret, msix_bar;
- struct mapped_pci_resource *vfio_res = NULL;
- struct mapped_pci_res_list *vfio_res_list = RTE_TAILQ_CAST(rte_vfio_tailq.head, mapped_pci_res_list);
-
- struct pci_map *maps;
- uint32_t msix_table_offset = 0;
- uint32_t msix_table_size = 0;
- uint32_t ioport_bar;
-
- dev->intr_handle.fd = -1;
- dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
-
- /* store PCI address string */
- snprintf(pci_addr, sizeof(pci_addr), PCI_PRI_FMT,
- loc->domain, loc->bus, loc->devid, loc->function);
+ int ret;
/* get group number */
ret = pci_vfio_get_group_no(pci_addr, &iommu_group_no);
@@ -476,8 +461,8 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
}
/*
- * at this point, we know at least one port on this device is bound to VFIO,
- * so we can proceed to try and set this particular port up
+ * at this point, we know that this group is viable (meaning, all devices
+ * are either bound to VFIO or not bound to anything)
*/
/* check if the group is viable */
@@ -495,11 +480,6 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
return -1;
}
- /*
- * at this point, we know that this group is viable (meaning, all devices
- * are either bound to VFIO or not bound to anything)
- */
-
/* check if group does not have a container yet */
if (!(group_status.flags & VFIO_GROUP_FLAGS_CONTAINER_SET)) {
@@ -546,8 +526,8 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
}
/* get a file descriptor for the device */
- vfio_dev_fd = ioctl(vfio_group_fd, VFIO_GROUP_GET_DEVICE_FD, pci_addr);
- if (vfio_dev_fd < 0) {
+ *vfio_dev_fd = ioctl(vfio_group_fd, VFIO_GROUP_GET_DEVICE_FD, pci_addr);
+ if (*vfio_dev_fd < 0) {
/* if we cannot get a device fd, this simply means that this
* particular port is not bound to VFIO
*/
@@ -557,14 +537,47 @@ pci_vfio_map_resource(struct rte_pci_device *dev)
}
/* test and setup the device */
- ret = ioctl(vfio_dev_fd, VFIO_DEVICE_GET_INFO, &device_info);
+ 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", pci_addr, errno, strerror(errno));
- close(vfio_dev_fd);
+ close(*vfio_dev_fd);
return -1;
}
+ return 0;
+}
+
+/*
+ * map the PCI resources of a PCI device in virtual memory (VFIO version).
+ * primary and secondary processes follow almost exactly the same path
+ */
+int
+pci_vfio_map_resource(struct rte_pci_device *dev)
+{
+ struct vfio_device_info device_info = { .argsz = sizeof(device_info) };
+ char pci_addr[PATH_MAX] = {0};
+ int vfio_dev_fd;
+ struct rte_pci_addr *loc = &dev->addr;
+ int i, ret, msix_bar;
+ struct mapped_pci_resource *vfio_res = NULL;
+ struct mapped_pci_res_list *vfio_res_list = RTE_TAILQ_CAST(rte_vfio_tailq.head, mapped_pci_res_list);
+
+ struct pci_map *maps;
+ uint32_t msix_table_offset = 0;
+ uint32_t msix_table_size = 0;
+ uint32_t ioport_bar;
+
+ dev->intr_handle.fd = -1;
+ dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
+ /* store PCI address string */
+ snprintf(pci_addr, sizeof(pci_addr), PCI_PRI_FMT,
+ loc->domain, loc->bus, loc->devid, loc->function);
+
+ if ((ret = pci_vfio_setup_device(pci_addr, &vfio_dev_fd, &device_info)))
+ return ret;
+
/* get MSI-X BAR, if any (we have to know where it is because we can't
* easily mmap it when using VFIO) */
msix_bar = -1;