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Message-ID: <20221207145428.31544-9-gautam.dawar@amd.com>
Date: Wed, 7 Dec 2022 20:24:24 +0530
From: Gautam Dawar <gautam.dawar@....com>
To: <linux-net-drivers@....com>, <netdev@...r.kernel.org>,
<jasowang@...hat.com>, <eperezma@...hat.com>
CC: <tanuj.kamde@....com>, <Koushik.Dutta@....com>,
<harpreet.anand@....com>, Gautam Dawar <gautam.dawar@....com>,
Edward Cree <ecree.xilinx@...il.com>,
Martin Habets <habetsm.xilinx@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next 08/11] sfc: implement device status related vdpa config operations
vDPA config opertions to handle get/set device status and device
reset have been implemented.
Signed-off-by: Gautam Dawar <gautam.dawar@....com>
---
drivers/net/ethernet/sfc/ef100_vdpa.c | 7 +-
drivers/net/ethernet/sfc/ef100_vdpa.h | 1 +
drivers/net/ethernet/sfc/ef100_vdpa_ops.c | 133 ++++++++++++++++++++++
3 files changed, 140 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.c b/drivers/net/ethernet/sfc/ef100_vdpa.c
index 04d64bfe3c93..80bca281a748 100644
--- a/drivers/net/ethernet/sfc/ef100_vdpa.c
+++ b/drivers/net/ethernet/sfc/ef100_vdpa.c
@@ -225,9 +225,14 @@ static int vdpa_allocate_vis(struct efx_nic *efx, unsigned int *allocated_vis)
static void ef100_vdpa_delete(struct efx_nic *efx)
{
+ struct vdpa_device *vdpa_dev;
+
if (efx->vdpa_nic) {
+ vdpa_dev = &efx->vdpa_nic->vdpa_dev;
+ ef100_vdpa_reset(vdpa_dev);
+
/* replace with _vdpa_unregister_device later */
- put_device(&efx->vdpa_nic->vdpa_dev.dev);
+ put_device(&vdpa_dev->dev);
efx->vdpa_nic = NULL;
}
efx_mcdi_free_vis(efx);
diff --git a/drivers/net/ethernet/sfc/ef100_vdpa.h b/drivers/net/ethernet/sfc/ef100_vdpa.h
index a33edd6dda12..1b0bbba88154 100644
--- a/drivers/net/ethernet/sfc/ef100_vdpa.h
+++ b/drivers/net/ethernet/sfc/ef100_vdpa.h
@@ -186,6 +186,7 @@ int ef100_vdpa_add_filter(struct ef100_vdpa_nic *vdpa_nic,
enum ef100_vdpa_mac_filter_type type);
int ef100_vdpa_irq_vectors_alloc(struct pci_dev *pci_dev, u16 nvqs);
void ef100_vdpa_irq_vectors_free(void *data);
+int ef100_vdpa_reset(struct vdpa_device *vdev);
static inline bool efx_vdpa_is_little_endian(struct ef100_vdpa_nic *vdpa_nic)
{
diff --git a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
index 132ddb4a647b..718b67f6da90 100644
--- a/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
+++ b/drivers/net/ethernet/sfc/ef100_vdpa_ops.c
@@ -251,6 +251,62 @@ static bool is_qid_invalid(struct ef100_vdpa_nic *vdpa_nic, u16 idx,
return false;
}
+static void ef100_reset_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
+{
+ int i;
+
+ WARN_ON(!mutex_is_locked(&vdpa_nic->lock));
+
+ if (!vdpa_nic->status)
+ return;
+
+ vdpa_nic->vdpa_state = EF100_VDPA_STATE_INITIALIZED;
+ vdpa_nic->status = 0;
+ vdpa_nic->features = 0;
+ for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++)
+ reset_vring(vdpa_nic, i);
+}
+
+/* May be called under the rtnl lock */
+int ef100_vdpa_reset(struct vdpa_device *vdev)
+{
+ struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
+
+ /* vdpa device can be deleted anytime but the bar_config
+ * could still be vdpa and hence efx->state would be STATE_VDPA.
+ * Accordingly, ensure vdpa device exists before reset handling
+ */
+ if (!vdpa_nic)
+ return -ENODEV;
+
+ mutex_lock(&vdpa_nic->lock);
+ ef100_reset_vdpa_device(vdpa_nic);
+ mutex_unlock(&vdpa_nic->lock);
+ return 0;
+}
+
+static int start_vdpa_device(struct ef100_vdpa_nic *vdpa_nic)
+{
+ int rc = 0;
+ int i, j;
+
+ for (i = 0; i < (vdpa_nic->max_queue_pairs * 2); i++) {
+ if (can_create_vring(vdpa_nic, i)) {
+ rc = create_vring(vdpa_nic, i);
+ if (rc)
+ goto clear_vring;
+ }
+ }
+ vdpa_nic->vdpa_state = EF100_VDPA_STATE_STARTED;
+ return rc;
+
+clear_vring:
+ for (j = 0; j < i; j++)
+ if (vdpa_nic->vring[j].vring_created)
+ delete_vring(vdpa_nic, j);
+ return rc;
+}
+
static int ef100_vdpa_set_vq_address(struct vdpa_device *vdev,
u16 idx, u64 desc_area, u64 driver_area,
u64 device_area)
@@ -568,6 +624,80 @@ static u32 ef100_vdpa_get_vendor_id(struct vdpa_device *vdev)
return EF100_VDPA_VENDOR_ID;
}
+static u8 ef100_vdpa_get_status(struct vdpa_device *vdev)
+{
+ struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
+ u8 status;
+
+ mutex_lock(&vdpa_nic->lock);
+ status = vdpa_nic->status;
+ mutex_unlock(&vdpa_nic->lock);
+ return status;
+}
+
+static void ef100_vdpa_set_status(struct vdpa_device *vdev, u8 status)
+{
+ struct ef100_vdpa_nic *vdpa_nic = get_vdpa_nic(vdev);
+ u8 new_status;
+ int rc;
+
+ mutex_lock(&vdpa_nic->lock);
+ if (!status) {
+ dev_info(&vdev->dev,
+ "%s: Status received is 0. Device reset being done\n",
+ __func__);
+ ef100_reset_vdpa_device(vdpa_nic);
+ goto unlock_return;
+ }
+ new_status = status & ~vdpa_nic->status;
+ if (new_status == 0) {
+ dev_info(&vdev->dev,
+ "%s: New status same as current status\n", __func__);
+ goto unlock_return;
+ }
+ if (new_status & VIRTIO_CONFIG_S_FAILED) {
+ ef100_reset_vdpa_device(vdpa_nic);
+ goto unlock_return;
+ }
+
+ if (new_status & VIRTIO_CONFIG_S_ACKNOWLEDGE &&
+ vdpa_nic->vdpa_state == EF100_VDPA_STATE_INITIALIZED) {
+ vdpa_nic->status |= VIRTIO_CONFIG_S_ACKNOWLEDGE;
+ new_status &= ~VIRTIO_CONFIG_S_ACKNOWLEDGE;
+ }
+ if (new_status & VIRTIO_CONFIG_S_DRIVER &&
+ vdpa_nic->vdpa_state == EF100_VDPA_STATE_INITIALIZED) {
+ vdpa_nic->status |= VIRTIO_CONFIG_S_DRIVER;
+ new_status &= ~VIRTIO_CONFIG_S_DRIVER;
+ }
+ if (new_status & VIRTIO_CONFIG_S_FEATURES_OK &&
+ vdpa_nic->vdpa_state == EF100_VDPA_STATE_INITIALIZED) {
+ vdpa_nic->status |= VIRTIO_CONFIG_S_FEATURES_OK;
+ vdpa_nic->vdpa_state = EF100_VDPA_STATE_NEGOTIATED;
+ new_status &= ~VIRTIO_CONFIG_S_FEATURES_OK;
+ }
+ if (new_status & VIRTIO_CONFIG_S_DRIVER_OK &&
+ vdpa_nic->vdpa_state == EF100_VDPA_STATE_NEGOTIATED) {
+ vdpa_nic->status |= VIRTIO_CONFIG_S_DRIVER_OK;
+ rc = start_vdpa_device(vdpa_nic);
+ if (rc) {
+ dev_err(&vdpa_nic->vdpa_dev.dev,
+ "%s: vDPA device failed:%d\n", __func__, rc);
+ vdpa_nic->status &= ~VIRTIO_CONFIG_S_DRIVER_OK;
+ goto unlock_return;
+ }
+ new_status &= ~VIRTIO_CONFIG_S_DRIVER_OK;
+ }
+ if (new_status) {
+ dev_warn(&vdev->dev,
+ "%s: Mismatch Status: %x & State: %u\n",
+ __func__, new_status, vdpa_nic->vdpa_state);
+ }
+
+unlock_return:
+ mutex_unlock(&vdpa_nic->lock);
+}
+
static size_t ef100_vdpa_get_config_size(struct vdpa_device *vdev)
{
return sizeof(struct virtio_net_config);
@@ -640,6 +770,9 @@ const struct vdpa_config_ops ef100_vdpa_config_ops = {
.get_vq_num_max = ef100_vdpa_get_vq_num_max,
.get_device_id = ef100_vdpa_get_device_id,
.get_vendor_id = ef100_vdpa_get_vendor_id,
+ .get_status = ef100_vdpa_get_status,
+ .set_status = ef100_vdpa_set_status,
+ .reset = ef100_vdpa_reset,
.get_config_size = ef100_vdpa_get_config_size,
.get_config = ef100_vdpa_get_config,
.set_config = ef100_vdpa_set_config,
--
2.30.1
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