[dpdk-dev] [PATCH 20/40] net/virtio: make interrupt handling more generic
Maxime Coquelin
maxime.coquelin at redhat.com
Sun Dec 20 22:13:45 CET 2020
This patch aims at isolating MSIX notion into PCI
layer.
Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
drivers/net/virtio/virtio.c | 6 ++
drivers/net/virtio/virtio.h | 11 +-
drivers/net/virtio/virtio_ethdev.c | 7 +-
drivers/net/virtio/virtio_pci.c | 131 ++++++++++++------------
drivers/net/virtio/virtio_pci.h | 25 ++---
drivers/net/virtio/virtio_user_ethdev.c | 4 +-
6 files changed, 90 insertions(+), 94 deletions(-)
diff --git a/drivers/net/virtio/virtio.c b/drivers/net/virtio/virtio.c
index ba3203e68b..7e1e77797f 100644
--- a/drivers/net/virtio/virtio.c
+++ b/drivers/net/virtio/virtio.c
@@ -63,3 +63,9 @@ virtio_get_status(struct virtio_hw *hw)
{
return VIRTIO_OPS(hw)->get_status(hw);
}
+
+uint8_t
+virtio_get_isr(struct virtio_hw *hw)
+{
+ return VIRTIO_OPS(hw)->get_isr(hw);
+}
diff --git a/drivers/net/virtio/virtio.h b/drivers/net/virtio/virtio.h
index 5169436c9f..f44125f48a 100644
--- a/drivers/net/virtio/virtio.h
+++ b/drivers/net/virtio/virtio.h
@@ -124,6 +124,13 @@
#define VIRTIO_CONFIG_STATUS_DEV_NEED_RESET 0x40
#define VIRTIO_CONFIG_STATUS_FAILED 0x80
+/* The bit of the ISR which indicates a device has an interrupt. */
+#define VIRTIO_ISR_INTR 0x1
+/* The bit of the ISR which indicates a device configuration change. */
+#define VIRTIO_ISR_CONFIG 0x2
+/* Vector value used to disable MSI for queue. */
+#define VIRTIO_MSI_NO_VECTOR 0xFFFF
+
/*
* This structure is just a reference to read
* net device specific config space; it just a chodu structure
@@ -168,7 +175,7 @@ struct virtio_hw {
uint8_t mac_addr[RTE_ETHER_ADDR_LEN];
uint32_t speed; /* link speed in MB */
uint8_t duplex;
- uint8_t use_msix;
+ uint8_t intr_lsc;
uint16_t max_mtu;
/*
* App management thread and virtio interrupt handler thread
@@ -233,5 +240,5 @@ void virtio_write_dev_config(struct virtio_hw *hw, size_t offset, const void *sr
void virtio_read_dev_config(struct virtio_hw *hw, size_t offset, void *dst, int length);
void virtio_reset(struct virtio_hw *hw);
void virtio_reinit_complete(struct virtio_hw *hw);
-
+uint8_t virtio_get_isr(struct virtio_hw *hw);
#endif /* _VIRTIO_H_ */
diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 560647f11b..99a2dd24c4 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1442,13 +1442,13 @@ virtio_interrupt_handler(void *param)
uint16_t status;
/* Read interrupt status which clears interrupt */
- isr = vtpci_isr(hw);
+ isr = virtio_get_isr(hw);
PMD_DRV_LOG(INFO, "interrupt status = %#x", isr);
if (virtio_intr_unmask(dev) < 0)
PMD_DRV_LOG(ERR, "interrupt enable failed");
- if (isr & VIRTIO_PCI_ISR_CONFIG) {
+ if (isr & VIRTIO_ISR_CONFIG) {
if (virtio_dev_link_update(dev, 0) == 0)
rte_eth_dev_callback_process(dev,
RTE_ETH_EVENT_INTR_LSC,
@@ -1655,8 +1655,7 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
hw->weak_barriers = !virtio_with_feature(hw, VIRTIO_F_ORDER_PLATFORM);
/* If host does not support both status and MSI-X then disable LSC */
- if (virtio_with_feature(hw, VIRTIO_NET_F_STATUS) &&
- hw->use_msix != VIRTIO_MSIX_NONE)
+ if (virtio_with_feature(hw, VIRTIO_NET_F_STATUS) && hw->intr_lsc)
eth_dev->data->dev_flags |= RTE_ETH_DEV_INTR_LSC;
else
eth_dev->data->dev_flags &= ~RTE_ETH_DEV_INTR_LSC;
diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 29dd84888f..01a437a1b4 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -28,8 +28,8 @@
* The remaining space is defined by each driver as the per-driver
* configuration space.
*/
-#define VIRTIO_PCI_CONFIG(hw) \
- (((hw)->use_msix == VIRTIO_MSIX_ENABLED) ? 24 : 20)
+#define VIRTIO_PCI_CONFIG(dev) \
+ (((dev)->msix_status == VIRTIO_MSIX_ENABLED) ? 24 : 20)
struct virtio_pci_internal {
@@ -71,6 +71,7 @@ static void
legacy_read_dev_config(struct virtio_hw *hw, size_t offset,
void *dst, int length)
{
+ struct virtio_pci_dev *dev = virtio_pci_get_dev(hw);
#ifdef RTE_ARCH_PPC_64
int size;
@@ -78,17 +79,17 @@ legacy_read_dev_config(struct virtio_hw *hw, size_t offset,
if (length >= 4) {
size = 4;
rte_pci_ioport_read(VTPCI_IO(hw), dst, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
*(uint32_t *)dst = rte_be_to_cpu_32(*(uint32_t *)dst);
} else if (length >= 2) {
size = 2;
rte_pci_ioport_read(VTPCI_IO(hw), dst, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
*(uint16_t *)dst = rte_be_to_cpu_16(*(uint16_t *)dst);
} else {
size = 1;
rte_pci_ioport_read(VTPCI_IO(hw), dst, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
}
dst = (char *)dst + size;
@@ -97,7 +98,7 @@ legacy_read_dev_config(struct virtio_hw *hw, size_t offset,
}
#else
rte_pci_ioport_read(VTPCI_IO(hw), dst, length,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
#endif
}
@@ -105,6 +106,7 @@ static void
legacy_write_dev_config(struct virtio_hw *hw, size_t offset,
const void *src, int length)
{
+ struct virtio_pci_dev *dev = virtio_pci_get_dev(hw);
#ifdef RTE_ARCH_PPC_64
union {
uint32_t u32;
@@ -117,16 +119,16 @@ legacy_write_dev_config(struct virtio_hw *hw, size_t offset,
size = 4;
tmp.u32 = rte_cpu_to_be_32(*(const uint32_t *)src);
rte_pci_ioport_write(VTPCI_IO(hw), &tmp.u32, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
} else if (length >= 2) {
size = 2;
tmp.u16 = rte_cpu_to_be_16(*(const uint16_t *)src);
rte_pci_ioport_write(VTPCI_IO(hw), &tmp.u16, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
} else {
size = 1;
rte_pci_ioport_write(VTPCI_IO(hw), src, size,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
}
src = (const char *)src + size;
@@ -135,7 +137,7 @@ legacy_write_dev_config(struct virtio_hw *hw, size_t offset,
}
#else
rte_pci_ioport_write(VTPCI_IO(hw), src, length,
- VIRTIO_PCI_CONFIG(hw) + offset);
+ VIRTIO_PCI_CONFIG(dev) + offset);
#endif
}
@@ -533,12 +535,6 @@ const struct virtio_ops modern_ops = {
.dev_close = modern_dev_close,
};
-uint8_t
-vtpci_isr(struct virtio_hw *hw)
-{
- return VIRTIO_OPS(hw)->get_isr(hw);
-}
-
static void *
get_cfg_addr(struct rte_pci_device *dev, struct virtio_pci_cap *cap)
{
@@ -623,9 +619,9 @@ virtio_read_caps(struct rte_pci_device *pci_dev, struct virtio_hw *hw)
}
if (flags & PCI_MSIX_ENABLE)
- hw->use_msix = VIRTIO_MSIX_ENABLED;
+ dev->msix_status = VIRTIO_MSIX_ENABLED;
else
- hw->use_msix = VIRTIO_MSIX_DISABLED;
+ dev->msix_status = VIRTIO_MSIX_DISABLED;
}
if (cap.cap_vndr != PCI_CAP_ID_VNDR) {
@@ -691,6 +687,54 @@ virtio_read_caps(struct rte_pci_device *pci_dev, struct virtio_hw *hw)
return 0;
}
+static enum virtio_msix_status
+vtpci_msix_detect(struct rte_pci_device *dev)
+{
+ uint8_t pos;
+ int ret;
+
+ ret = rte_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
+ if (ret != 1) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci capability list, ret %d", ret);
+ return VIRTIO_MSIX_NONE;
+ }
+
+ while (pos) {
+ uint8_t cap[2];
+
+ ret = rte_pci_read_config(dev, cap, sizeof(cap), pos);
+ if (ret != sizeof(cap)) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci cap at pos: %x ret %d",
+ pos, ret);
+ break;
+ }
+
+ if (cap[0] == PCI_CAP_ID_MSIX) {
+ uint16_t flags;
+
+ ret = rte_pci_read_config(dev, &flags, sizeof(flags),
+ pos + sizeof(cap));
+ if (ret != sizeof(flags)) {
+ PMD_INIT_LOG(DEBUG,
+ "failed to read pci cap at pos:"
+ " %x ret %d", pos + 2, ret);
+ break;
+ }
+
+ if (flags & PCI_MSIX_ENABLE)
+ return VIRTIO_MSIX_ENABLED;
+ else
+ return VIRTIO_MSIX_DISABLED;
+ }
+
+ pos = cap[1];
+ }
+
+ return VIRTIO_MSIX_NONE;
+}
+
/*
* Return -1:
* if there is error mapping with VFIO/UIO.
@@ -736,59 +780,12 @@ vtpci_init(struct rte_pci_device *pci_dev, struct virtio_pci_dev *dev)
dev->modern = false;
msix_detect:
- hw->use_msix = vtpci_msix_detect(pci_dev);
+ dev->msix_status = vtpci_msix_detect(pci_dev);
+ hw->intr_lsc = !!dev->msix_status;
return 0;
}
-enum virtio_msix_status
-vtpci_msix_detect(struct rte_pci_device *dev)
-{
- uint8_t pos;
- int ret;
-
- ret = rte_pci_read_config(dev, &pos, 1, PCI_CAPABILITY_LIST);
- if (ret != 1) {
- PMD_INIT_LOG(DEBUG,
- "failed to read pci capability list, ret %d", ret);
- return VIRTIO_MSIX_NONE;
- }
-
- while (pos) {
- uint8_t cap[2];
-
- ret = rte_pci_read_config(dev, cap, sizeof(cap), pos);
- if (ret != sizeof(cap)) {
- PMD_INIT_LOG(DEBUG,
- "failed to read pci cap at pos: %x ret %d",
- pos, ret);
- break;
- }
-
- if (cap[0] == PCI_CAP_ID_MSIX) {
- uint16_t flags;
-
- ret = rte_pci_read_config(dev, &flags, sizeof(flags),
- pos + sizeof(cap));
- if (ret != sizeof(flags)) {
- PMD_INIT_LOG(DEBUG,
- "failed to read pci cap at pos:"
- " %x ret %d", pos + 2, ret);
- break;
- }
-
- if (flags & PCI_MSIX_ENABLE)
- return VIRTIO_MSIX_ENABLED;
- else
- return VIRTIO_MSIX_DISABLED;
- }
-
- pos = cap[1];
- }
-
- return VIRTIO_MSIX_NONE;
-}
-
void vtpci_legacy_ioport_unmap(struct virtio_hw *hw)
{
rte_pci_ioport_unmap(VTPCI_IO(hw));
diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index 19d56c920c..4ee890ffda 100644
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -42,13 +42,6 @@ struct virtnet_ctl;
#define VIRTIO_MSI_QUEUE_VECTOR 22 /* vector for selected VQ notifications
(16, RW) */
-/* The bit of the ISR which indicates a device has an interrupt. */
-#define VIRTIO_PCI_ISR_INTR 0x1
-/* The bit of the ISR which indicates a device configuration change. */
-#define VIRTIO_PCI_ISR_CONFIG 0x2
-/* Vector value used to disable MSI for queue. */
-#define VIRTIO_MSI_NO_VECTOR 0xFFFF
-
/* Common configuration */
#define VIRTIO_PCI_CAP_COMMON_CFG 1
/* Notifications */
@@ -103,12 +96,18 @@ struct virtio_pci_common_cfg {
uint32_t queue_used_hi; /* read-write */
};
+enum virtio_msix_status {
+ VIRTIO_MSIX_NONE = 0,
+ VIRTIO_MSIX_DISABLED = 1,
+ VIRTIO_MSIX_ENABLED = 2
+};
struct virtio_pci_dev {
struct virtio_hw hw;
struct rte_pci_device *pci_dev;
struct virtio_pci_common_cfg *common_cfg;
struct virtio_net_config *dev_cfg;
+ enum virtio_msix_status msix_status;
uint8_t *isr;
uint16_t *notify_base;
uint32_t notify_off_multiplier;
@@ -126,22 +125,10 @@ struct virtio_pci_dev {
/* 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
-};
-
-
/*
* Function declaration from virtio_pci.c
*/
int vtpci_init(struct rte_pci_device *pci_dev, struct virtio_pci_dev *dev);
-
-uint8_t vtpci_isr(struct virtio_hw *);
-
-enum virtio_msix_status vtpci_msix_detect(struct rte_pci_device *dev);
-
void vtpci_legacy_ioport_unmap(struct virtio_hw *hw);
int vtpci_legacy_ioport_map(struct virtio_hw *hw);
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index 0f252c0732..eacb268297 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -339,7 +339,7 @@ virtio_user_get_isr(struct virtio_hw *hw __rte_unused)
/* rxq interrupts and config interrupt are separated in virtio-user,
* here we only report config change.
*/
- return VIRTIO_PCI_ISR_CONFIG;
+ return VIRTIO_ISR_CONFIG;
}
static uint16_t
@@ -640,7 +640,7 @@ virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
* MSIX is required to enable LSC (see virtio_init_device).
* Here just pretend that we support msix.
*/
- hw->use_msix = 1;
+ hw->intr_lsc = 1;
hw->use_vec_rx = 0;
hw->use_vec_tx = 0;
hw->use_inorder_rx = 0;
--
2.29.2
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