[dpdk-stable] [PATCH v4] net/virtio: fix rxq intr config fails using vfio-pci

[dpdk-stable] [PATCH v4] net/virtio: fix rxq intr config fails using vfio-pci

[Zhiyong Yang]

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.
use_msix can indicate three different msix status by:
VIRTIO_MSIX_NONE (0)
VIRTIO_MSIX_DISABLED (1)
VIRTIO_MSIX_ENABLED (2)

CC: stable@dpdk.org
CC: jianfeng.tan@intel.com
CC: yliu@fridaylinux.org
CC: maxime.coquelin@redhat.com

Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
---

Changes in v4:
Enhance the commit log description.

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));
+
+	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;
-- 
2.13.3

Re: [dpdk-stable] [PATCH v4] net/virtio: fix rxq intr config fails using vfio-pci

[Tan, Jianfeng]

> -----Original Message-----
> From: Yang, Zhiyong
> Sent: Thursday, November 9, 2017 12:46 PM
> To: dev@dpdk.org
> Cc: stable@dpdk.org; Tan, Jianfeng; yliu@fridaylinux.org;
> maxime.coquelin@redhat.com; Yang, Zhiyong
> Subject: [PATCH v4] net/virtio: fix rxq intr config fails using vfio-pci
> 
> 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.
> use_msix can indicate three different msix status by:
> VIRTIO_MSIX_NONE (0)
> VIRTIO_MSIX_DISABLED (1)
> VIRTIO_MSIX_ENABLED (2)
> 
> CC: stable@dpdk.org
> CC: jianfeng.tan@intel.com
> CC: yliu@fridaylinux.org
> CC: maxime.coquelin@redhat.com
> 
> Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>

Except a small nit, looks good to me:

Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>

> ---
> 
> Changes in v4:
> Enhance the commit log description.
> 
> 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));
> +
> +	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)
> + */

Above comments seems not necessary as it just repeat it's just the macro's definition.

Thanks,
Jianfeng

Re: [dpdk-stable] [PATCH v4] net/virtio: fix rxq intr config fails using vfio-pci

[Maxime Coquelin]

On 11/09/2017 05:46 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.
> use_msix can indicate three different msix status by:
> VIRTIO_MSIX_NONE (0)
> VIRTIO_MSIX_DISABLED (1)
> VIRTIO_MSIX_ENABLED (2)
> 
> CC: stable@dpdk.org
> CC: jianfeng.tan@intel.com
> CC: yliu@fridaylinux.org
> CC: maxime.coquelin@redhat.com
> 
> Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> ---
> 
> Changes in v4:
> Enhance the commit log description.
> 
> 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));
> +
> +	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

Maybe it could be cleaner to change the defines into an enum.


> +
>   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);
So here, the function would return an enum.

Otherwise, the patch looks good to me. If you do the proposed change, 
feel free to add my:

Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

[dpdk-stable] [PATCH v5] net/virtio: fix rxq intr config fails using vfio-pci

[Zhiyong Yang]

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.
use_msix can indicate three different msix status by:
VIRTIO_MSIX_NONE (0)
VIRTIO_MSIX_DISABLED (1)
VIRTIO_MSIX_ENABLED (2)

CC: stable@dpdk.org
CC: jianfeng.tan@intel.com
CC: yliu@fridaylinux.org
CC: maxime.coquelin@redhat.com

Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

Changes in v5:
1. Introduce new enum data type "VIRTIO_MSIX_STATUS" instead of macros.
2. Remove the unnecessary comments.

Changes in v4:
Enhance the commit log description.

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    | 43 +++++++++++++++++++++++++++++++++--
 drivers/net/virtio/virtio_pci.h    |  8 +++++++
 3 files changed, 88 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));
+
+	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..d6016de22 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 +713,39 @@ vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw)
 
 	return 0;
 }
+
+enum VIRTIO_MSIX_STATUS
+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..28e9af6c7 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -314,6 +314,12 @@ struct virtio_net_config {
 /* The alignment to use between consumer and producer parts of vring. */
 #define VIRTIO_PCI_VRING_ALIGN 4096
 
+enum VIRTIO_MSIX_STATUS {
+	VIRTIO_MSIX_NONE = 0,
+	VIRTIO_MSIX_DISABLED = 1,
+	VIRTIO_MSIX_ENABLED = 2
+};
+
 static inline int
 vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
 {
@@ -339,6 +345,8 @@ void vtpci_read_dev_config(struct virtio_hw *, size_t, void *, int);
 
 uint8_t vtpci_isr(struct virtio_hw *);
 
+enum VIRTIO_MSIX_STATUS 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;
-- 
2.13.3

Re: [dpdk-stable] [PATCH v5] net/virtio: fix rxq intr config fails using vfio-pci

[Maxime Coquelin]

On 11/09/2017 09:55 AM, Zhiyong Yang wrote:
> diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
> index 36d452c06..28e9af6c7 100644
> --- a/drivers/net/virtio/virtio_pci.h
> +++ b/drivers/net/virtio/virtio_pci.h
> @@ -314,6 +314,12 @@ struct virtio_net_config {
>   /* The alignment to use between consumer and producer parts of vring. */
>   #define VIRTIO_PCI_VRING_ALIGN 4096
>   
> +enum VIRTIO_MSIX_STATUS {
Please change VIRTIO_MSIX_STATUS to lowercase.
Other than that, this is what I had in mind.

Thanks!
Maxime
> +	VIRTIO_MSIX_NONE = 0,
> +	VIRTIO_MSIX_DISABLED = 1,
> +	VIRTIO_MSIX_ENABLED = 2
> +};
> +

Re: [dpdk-stable] [PATCH v5] net/virtio: fix rxq intr config fails using vfio-pci

[Yang, Zhiyong]

> -----Original Message-----
> From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> Sent: Thursday, November 9, 2017 5:09 PM
> To: Yang, Zhiyong <zhiyong.yang@intel.com>; dev@dpdk.org
> Cc: stable@dpdk.org; Tan, Jianfeng <jianfeng.tan@intel.com>;
> yliu@fridaylinux.org
> Subject: Re: [PATCH v5] net/virtio: fix rxq intr config fails using vfio-pci
> 
> 
> 
> On 11/09/2017 09:55 AM, Zhiyong Yang wrote:
> > diff --git a/drivers/net/virtio/virtio_pci.h
> > b/drivers/net/virtio/virtio_pci.h index 36d452c06..28e9af6c7 100644
> > --- a/drivers/net/virtio/virtio_pci.h
> > +++ b/drivers/net/virtio/virtio_pci.h
> > @@ -314,6 +314,12 @@ struct virtio_net_config {
> >   /* The alignment to use between consumer and producer parts of vring. */
> >   #define VIRTIO_PCI_VRING_ALIGN 4096
> >
> > +enum VIRTIO_MSIX_STATUS {
> Please change VIRTIO_MSIX_STATUS to lowercase.
> Other than that, this is what I had in mind.
> 

Thanks for your reminder.  My negligence and not notice it.

Thanks
Zhiyong

[dpdk-stable] [PATCH v6] net/virtio: fix rxq intr config fails using vfio-pci

[Zhiyong Yang]

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.
use_msix can indicate three different msix status by:
VIRTIO_MSIX_NONE (0)
VIRTIO_MSIX_DISABLED (1)
VIRTIO_MSIX_ENABLED (2)

CC: stable@dpdk.org
CC: jianfeng.tan@intel.com
CC: yliu@fridaylinux.org
CC: maxime.coquelin@redhat.com

Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

Changes in v6:
Change enum type name "VIRTIO_MSIX_STATUS" to "virtio_msix_status".

Changes in v5:
1. Introduce new enum data type "VIRTIO_MSIX_STATUS" instead of macros.
2. Remove the unnecessary comments.

Changes in v4:
Enhance the commit log description.

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    | 43 +++++++++++++++++++++++++++++++++--
 drivers/net/virtio/virtio_pci.h    |  8 +++++++
 3 files changed, 88 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));
+
+	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..9574498fb 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 +713,39 @@ vtpci_init(struct rte_pci_device *dev, struct virtio_hw *hw)
 
 	return 0;
 }
+
+enum virtio_msix_status
+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..3c5ce66ce 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -314,6 +314,12 @@ struct virtio_net_config {
 /* The alignment to use between consumer and producer parts of vring. */
 #define VIRTIO_PCI_VRING_ALIGN 4096
 
+enum virtio_msix_status {
+	VIRTIO_MSIX_NONE = 0,
+	VIRTIO_MSIX_DISABLED = 1,
+	VIRTIO_MSIX_ENABLED = 2
+};
+
 static inline int
 vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
 {
@@ -339,6 +345,8 @@ void vtpci_read_dev_config(struct virtio_hw *, size_t, void *, int);
 
 uint8_t vtpci_isr(struct virtio_hw *);
 
+enum virtio_msix_status 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;
-- 
2.13.3

Re: [dpdk-stable] [dpdk-dev] [PATCH v6] net/virtio: fix rxq intr config fails using vfio-pci

[Thomas Monjalon]

09/11/2017 10:21, Zhiyong Yang:
> 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.
> use_msix can indicate three different msix status by:
> VIRTIO_MSIX_NONE (0)
> VIRTIO_MSIX_DISABLED (1)
> VIRTIO_MSIX_ENABLED (2)
> 
> CC: stable@dpdk.org
> CC: jianfeng.tan@intel.com
> CC: yliu@fridaylinux.org
> CC: maxime.coquelin@redhat.com
> 
> Fixes: cb482cb3a305 ("net/virtio: fix MAC address read")
> Signed-off-by: Zhiyong Yang <zhiyong.yang@intel.com>
> Acked-by: Jianfeng Tan <jianfeng.tan@intel.com>
> Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Applied, thanks