virtio: fix query of legacy features

Declare dst as type uint32_t instead of uint64_t, otherwise, we will get
a random upper 32 bit feature bits, as the following io port read reads
lower 32 bit only. It could lead a feature bits that include VIRTIO_F_VERSION_1
(the 32th bit) for legacy virtio, which is obviously wrong.

Fixes: b8f04520ad71 ("virtio: use PCI ioport API")

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
Reviewed-by: David Marchand <david.marchand@6wind.com>

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 98fc370..c007959 100644 (file)
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -74,7 +74,7 @@ legacy_write_dev_config(struct virtio_hw *hw, size_t offset,
 static uint64_t
 legacy_get_features(struct virtio_hw *hw)
 {
-       uint64_t dst;
+       uint32_t dst;
 
        rte_eal_pci_ioport_read(&hw->io, &dst, 4, VIRTIO_PCI_HOST_FEATURES);
        return dst;