[dpdk-stable] [PATCH 1/3] net/virtio: fix wrong MSI-X for modern devices
Jianfeng Tan
jianfeng.tan at intel.com
Wed Apr 26 06:52:49 CEST 2017
The field, use_msix, in struct virtio_hw is not updated for modern
device, and is always zero. And now we depend on the status feature
and MSI-X to report LSC support (which is also not a correct
behavior). As a result, LSC is always disabled for modern devices.
Te fix this, we just recognize MSI-X capability when going through
capability list, and update the info in virtio.
Fixes: 6ba1f63b5ab0 ("virtio: support specification 1.0")
Cc: stable at dpdk.org
Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
drivers/net/virtio/virtio_pci.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index b767c03..ecad46e 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -50,6 +50,7 @@
*/
#define PCI_CAPABILITY_LIST 0x34
#define PCI_CAP_ID_VNDR 0x09
+#define PCI_CAP_ID_MSIX 0x11
/*
* The remaining space is defined by each driver as the per-driver
@@ -650,6 +651,9 @@ virtio_read_caps(struct rte_pci_device *dev, struct virtio_hw *hw)
break;
}
+ if (cap.cap_vndr == PCI_CAP_ID_MSIX)
+ hw->use_msix = 1;
+
if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
PMD_INIT_LOG(DEBUG,
"[%2x] skipping non VNDR cap id: %02x",
--
2.7.4
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