From: Brian Russell <bruss...@brocade.com>
In virtio_read_caps and vtpci_msix_detect, rte_pci_read_config returns
the number of bytes read from PCI config or < 0 on error.
If less than the expected number of bytes are read then log the
failure and return rather than carrying on with garbage.
Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Signed-off-by: Brian Russell <bruss...@brocade.com>
Signed-off-by: Luca Boccassi <bl...@debian.org>
---
v2: handle additional rte_pci_read_config incomplete reads
drivers/net/virtio/virtio_pci.c | 35 +++++++++++++++++++++------------
1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 6bd22e54a6..ff6f96f361 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -560,6 +560,7 @@ virtio_read_caps(struct rte_pci_device *dev, struct
virtio_hw *hw)
uint8_t pos;
struct virtio_pci_cap cap;
int ret;
+ uint32_t multiplier;
if (rte_pci_map_device(dev)) {
PMD_INIT_LOG(DEBUG, "failed to map pci device!");
@@ -567,16 +568,18 @@ virtio_read_caps(struct rte_pci_device *dev, struct
virtio_hw *hw)
}
ret = rte_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
- if (ret < 0) {
- PMD_INIT_LOG(DEBUG, "failed to read pci capability list");
+ if (ret != 1) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci capability list, ret %d", ret);
return -1;
}
while (pos) {
ret = rte_pci_read_config(dev, &cap, sizeof(cap), pos);
- if (ret < 0) {
- PMD_INIT_LOG(ERR,
- "failed to read pci cap at pos: %x", pos);
+ if (ret != sizeof(cap)) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci cap at pos: %x ret %d",
+ pos, ret);
break;
}
@@ -610,9 +613,13 @@ virtio_read_caps(struct rte_pci_device *dev, struct
virtio_hw *hw)
hw->common_cfg = get_cfg_addr(dev, &cap);
break;
case VIRTIO_PCI_CAP_NOTIFY_CFG:
- rte_pci_read_config(dev, &hw->notify_off_multiplier,
- 4, pos + sizeof(cap));
- hw->notify_base = get_cfg_addr(dev, &cap);
+ /* Avoid half-reads into hw */
+ ret = rte_pci_read_config(dev, &multiplier, 4,
+ pos + sizeof(cap));
+ if (ret == 4) {
+ hw->notify_off_multiplier = multiplier;
+ hw->notify_base = get_cfg_addr(dev, &cap);
+ }
break;
case VIRTIO_PCI_CAP_DEVICE_CFG:
hw->dev_cfg = get_cfg_addr(dev, &cap);
@@ -693,16 +700,18 @@ vtpci_msix_detect(struct rte_pci_device *dev)
int ret;
ret = rte_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
- if (ret < 0) {
- PMD_INIT_LOG(DEBUG, "failed to read pci capability list");
+ if (ret != 1) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci capability list, ret %d", ret);
return VIRTIO_MSIX_NONE;
}
while (pos) {
ret = rte_pci_read_config(dev, &cap, sizeof(cap), pos);
- if (ret < 0) {
- PMD_INIT_LOG(ERR,
- "failed to read pci cap at pos: %x", pos);
+ if (ret != sizeof(cap)) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci cap at pos: %x ret %d",
+ pos, ret);
break;
}
--
2.18.0
