[dpdk-dev] [PATCH v2 4/7] viritio: switch to 64 bit features

Yuanhan Liu yuanhan.liu at linux.intel.com
Tue Jan 12 07:59:01 CET 2016


Switch to 64 bit features, which virtio 1.0 supports.

While legacy virtio only supports 32 bit features, it complains aloud
and quit when trying to setting > 32 bit features.

Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
---
 drivers/net/virtio/virtio_ethdev.c |  8 ++++----
 drivers/net/virtio/virtio_pci.c    | 15 ++++++++++-----
 drivers/net/virtio/virtio_pci.h    | 12 ++++++------
 3 files changed, 20 insertions(+), 15 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index b57224d..94e0c4a 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -930,16 +930,16 @@ virtio_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 static void
 virtio_negotiate_features(struct virtio_hw *hw)
 {
-	uint32_t host_features;
+	uint64_t host_features;
 
 	/* Prepare guest_features: feature that driver wants to support */
 	hw->guest_features = VIRTIO_PMD_GUEST_FEATURES;
-	PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %x",
+	PMD_INIT_LOG(DEBUG, "guest_features before negotiate = %"PRIx64,
 		hw->guest_features);
 
 	/* Read device(host) feature bits */
 	host_features = hw->vtpci_ops->get_features(hw);
-	PMD_INIT_LOG(DEBUG, "host_features before negotiate = %x",
+	PMD_INIT_LOG(DEBUG, "host_features before negotiate = %"PRIx64,
 		host_features);
 
 	/*
@@ -947,7 +947,7 @@ virtio_negotiate_features(struct virtio_hw *hw)
 	 * guest feature bits.
 	 */
 	hw->guest_features = vtpci_negotiate_features(hw, host_features);
-	PMD_INIT_LOG(DEBUG, "features after negotiate = %x",
+	PMD_INIT_LOG(DEBUG, "features after negotiate = %"PRIx64,
 		hw->guest_features);
 }
 
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 03d623b..5eed57e 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -87,15 +87,20 @@ legacy_write_dev_config(struct virtio_hw *hw, uint64_t offset,
 	}
 }
 
-static uint32_t
+static uint64_t
 legacy_get_features(struct virtio_hw *hw)
 {
 	return VIRTIO_READ_REG_4(hw, VIRTIO_PCI_HOST_FEATURES);
 }
 
 static void
-legacy_set_features(struct virtio_hw *hw, uint32_t features)
+legacy_set_features(struct virtio_hw *hw, uint64_t features)
 {
+	if ((features >> 32) != 0) {
+		PMD_DRV_LOG(ERR,
+			"only 32 bit features are allowed for legacy virtio!");
+		return;
+	}
 	VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
 }
 
@@ -451,10 +456,10 @@ vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
 	hw->vtpci_ops->write_dev_cfg(hw, offset, src, length);
 }
 
-uint32_t
-vtpci_negotiate_features(struct virtio_hw *hw, uint32_t host_features)
+uint64_t
+vtpci_negotiate_features(struct virtio_hw *hw, uint64_t host_features)
 {
-	uint32_t features;
+	uint64_t features;
 
 	/*
 	 * Limit negotiated features to what the driver, virtqueue, and
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index ee7d265..3fd86f6 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -175,8 +175,8 @@ struct virtio_pci_ops {
 	uint8_t (*get_status)(struct virtio_hw *hw);
 	void    (*set_status)(struct virtio_hw *hw, uint8_t status);
 
-	uint32_t (*get_features)(struct virtio_hw *hw);
-	void     (*set_features)(struct virtio_hw *hw, uint32_t features);
+	uint64_t (*get_features)(struct virtio_hw *hw);
+	void     (*set_features)(struct virtio_hw *hw, uint64_t features);
 
 	uint8_t (*get_isr)(struct virtio_hw *hw);
 
@@ -191,7 +191,7 @@ struct virtio_pci_ops {
 struct virtio_hw {
 	struct virtqueue *cvq;
 	uint32_t    io_base;
-	uint32_t    guest_features;
+	uint64_t    guest_features;
 	uint32_t    max_tx_queues;
 	uint32_t    max_rx_queues;
 	uint16_t    vtnet_hdr_size;
@@ -271,9 +271,9 @@ outl_p(unsigned int data, unsigned int port)
 	outl_p((unsigned int)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
 
 static inline int
-vtpci_with_feature(struct virtio_hw *hw, uint32_t bit)
+vtpci_with_feature(struct virtio_hw *hw, uint64_t bit)
 {
-	return (hw->guest_features & (1u << bit)) != 0;
+	return (hw->guest_features & (1ULL << bit)) != 0;
 }
 
 /*
@@ -286,7 +286,7 @@ void vtpci_reinit_complete(struct virtio_hw *);
 
 void vtpci_set_status(struct virtio_hw *, uint8_t);
 
-uint32_t vtpci_negotiate_features(struct virtio_hw *, uint32_t);
+uint64_t vtpci_negotiate_features(struct virtio_hw *, uint64_t);
 
 void vtpci_write_dev_config(struct virtio_hw *, uint64_t, void *, int);
 
-- 
1.9.0



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