On 11/9/2017 11:18 AM, Zhiyong Yang wrote:
When running l3fwd-power to test virtio rxq interrupt using vfio
pci noiommu mode, startup fails. In the function virtio_read_caps,
the code if (flags & PCI_MSIX_ENABLE) intends to double check
if vfio msix is enabled or not. However, it is not enable at that
time. So use_msix is assigned to "0", not "1", which causes the
failure of configuring rxq intr in l3fwd-power.
This patch adds the function "vtpci_msix_detect" to detect the status
of msix when interrupt changes happen.
In the meanwhile, virtio_intr_enable/disable are introduced to wrap
rte_intr_enable/disable to enhance the ability to detect msix. Only
supporting and enabling msix can assign "VIRTIO_MSIX_ENABLED(2)" to
use_msix.
Above sentence seems not correct. As we can assign VIRTIO_MSIX_NONE,
VIRTIO_MSIX_DISABLED, VIRTIO_MSIX_ENABLED to use_msix to indicate three
different msix status.
Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
Signed-off-by: Zhiyong Yang <zhiyong.y...@intel.com>
---
Changes in v3:
Simply the code according to jianfeng's comments.
Changes in v2:
Add the capability to detect msix if virtio intr changes.
drivers/net/virtio/virtio_ethdev.c | 46 ++++++++++++++++++++++++++++++------
drivers/net/virtio/virtio_pci.c | 48 ++++++++++++++++++++++++++++++++++++--
drivers/net/virtio/virtio_pci.h | 6 +++++
3 files changed, 91 insertions(+), 9 deletions(-)
diff --git a/drivers/net/virtio/virtio_ethdev.c
b/drivers/net/virtio/virtio_ethdev.c
index d2576d5e0..87ac2bee6 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -97,6 +97,9 @@ static void virtio_mac_addr_remove(struct rte_eth_dev *dev,
uint32_t index);
static void virtio_mac_addr_set(struct rte_eth_dev *dev,
struct ether_addr *mac_addr);
+static int virtio_intr_enable(struct rte_eth_dev *dev);
+static int virtio_intr_disable(struct rte_eth_dev *dev);
+
static int virtio_dev_queue_stats_mapping_set(
struct rte_eth_dev *eth_dev,
uint16_t queue_id,
@@ -618,7 +621,7 @@ virtio_dev_close(struct rte_eth_dev *dev)
virtio_queues_unbind_intr(dev);
if (intr_conf->lsc || intr_conf->rxq) {
- rte_intr_disable(dev->intr_handle);
+ virtio_intr_disable(dev);
rte_intr_efd_disable(dev->intr_handle);
rte_free(dev->intr_handle->intr_vec);
dev->intr_handle->intr_vec = NULL;
@@ -1160,6 +1163,34 @@ virtio_vlan_filter_set(struct rte_eth_dev *dev, uint16_t
vlan_id, int on)
}
static int
+virtio_intr_enable(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw = dev->data->dev_private;
+
+ if (rte_intr_enable(dev->intr_handle) < 0)
+ return -1;
+
+ if (!hw->virtio_user_dev)
+ hw->use_msix = vtpci_msix_detect(RTE_ETH_DEV_TO_PCI(dev));
Maybe we can check hw->use_msix as an additional check; if it does not
equal VIRTIO_MSIX_ENABLE, returns -1.
+
+ return 0;
+}
+
+static int
+virtio_intr_disable(struct rte_eth_dev *dev)
+{
+ struct virtio_hw *hw = dev->data->dev_private;
+
+ if (rte_intr_disable(dev->intr_handle) < 0)
+ return -1;
+
+ if (!hw->virtio_user_dev)
+ hw->use_msix = vtpci_msix_detect(RTE_ETH_DEV_TO_PCI(dev));
+
+ return 0;
+}
+
+static int
virtio_negotiate_features(struct virtio_hw *hw, uint64_t req_features)
{
uint64_t host_features;
@@ -1228,7 +1259,7 @@ virtio_interrupt_handler(void *param)
isr = vtpci_isr(hw);
PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
- if (rte_intr_enable(dev->intr_handle) < 0)
+ if (virtio_intr_enable(dev) < 0)
PMD_DRV_LOG(ERR, "interrupt enable failed");
if (isr & VIRTIO_PCI_ISR_CONFIG) {
@@ -1348,7 +1379,7 @@ virtio_configure_intr(struct rte_eth_dev *dev)
* to change the config size from 20 to 24, or VIRTIO_MSI_QUEUE_VECTOR
* (22) will be ignored.
*/
- if (rte_intr_enable(dev->intr_handle) < 0) {
+ if (virtio_intr_enable(dev) < 0) {
PMD_DRV_LOG(ERR, "interrupt enable failed");
return -1;
}
@@ -1388,7 +1419,8 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t
req_features)
}
/* If host does not support both status and MSI-X then disable LSC */
- if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS) && hw->use_msix)
+ if (vtpci_with_feature(hw, VIRTIO_NET_F_STATUS) &&
+ hw->use_msix != VIRTIO_MSIX_NONE)
eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
else
eth_dev->data->dev_flags &= ~RTE_ETH_DEV_INTR_LSC;
@@ -1801,9 +1833,9 @@ virtio_dev_start(struct rte_eth_dev *dev)
*/
if (dev->data->dev_conf.intr_conf.lsc ||
dev->data->dev_conf.intr_conf.rxq) {
- rte_intr_disable(dev->intr_handle);
+ virtio_intr_disable(dev);
- if (rte_intr_enable(dev->intr_handle) < 0) {
+ if (virtio_intr_enable(dev) < 0) {
PMD_DRV_LOG(ERR, "interrupt enable failed");
return -EIO;
}
@@ -1912,7 +1944,7 @@ virtio_dev_stop(struct rte_eth_dev *dev)
PMD_INIT_LOG(DEBUG, "stop");
if (intr_conf->lsc || intr_conf->rxq)
- rte_intr_disable(dev->intr_handle);
+ virtio_intr_disable(dev);
hw->started = 0;
memset(&link, 0, sizeof(link));
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 55b717c03..10c45228c 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -57,7 +57,8 @@
* The remaining space is defined by each driver as the per-driver
* configuration space.
*/
-#define VIRTIO_PCI_CONFIG(hw) (((hw)->use_msix) ? 24 : 20)
+#define VIRTIO_PCI_CONFIG(hw) \
+ (((hw)->use_msix == VIRTIO_MSIX_ENABLED) ? 24 : 20)
static inline int
check_vq_phys_addr_ok(struct virtqueue *vq)
@@ -617,7 +618,9 @@ virtio_read_caps(struct rte_pci_device *dev, struct
virtio_hw *hw)
uint16_t flags = ((uint16_t *)&cap)[1];
if (flags & PCI_MSIX_ENABLE)
- hw->use_msix = 1;
+ hw->use_msix = VIRTIO_MSIX_ENABLED;
+ else
+ hw->use_msix = VIRTIO_MSIX_DISABLED;
}
if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
@@ -710,3 +713,44 @@ vtpci_init(struct rte_pci_device *dev, struct virtio_hw
*hw)
return 0;
}
+
+/* Return 0 (VIRTIO_MSIX_NONE)
+ * Return 1 (VIRTIO_MSIX_DISABLED)
+ * Return 2 (VIRTIO_MSIX_ENABLED)
+ */
+
+uint8_t
+vtpci_msix_detect(struct rte_pci_device *dev)
+{
+ uint8_t pos;
+ struct virtio_pci_cap cap;
+ 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");
+ 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);
+ break;
+ }
+
+ if (cap.cap_vndr == PCI_CAP_ID_MSIX) {
+ uint16_t flags = ((uint16_t *)&cap)[1];
+
+ if (flags & PCI_MSIX_ENABLE)
+ return VIRTIO_MSIX_ENABLED;
+ else
+ return VIRTIO_MSIX_DISABLED;
+ }
+
+ pos = cap.cap_next;
+ }
+
+ return VIRTIO_MSIX_NONE;
+}
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 36d452c06..600e106eb 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -314,6 +314,10 @@ struct virtio_net_config {
/* The alignment to use between consumer and producer parts of vring. */
#define VIRTIO_PCI_VRING_ALIGN 4096
+#define VIRTIO_MSIX_NONE 0
+#define VIRTIO_MSIX_DISABLED 1
+#define VIRTIO_MSIX_ENABLED 2
+
static inline int
vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
{
@@ -339,6 +343,8 @@ void vtpci_read_dev_config(struct virtio_hw *, size_t, void
*, int);
uint8_t vtpci_isr(struct virtio_hw *);
+uint8_t vtpci_msix_detect(struct rte_pci_device *dev);
+
extern const struct virtio_pci_ops legacy_ops;
extern const struct virtio_pci_ops modern_ops;
extern const struct virtio_pci_ops virtio_user_ops;
