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authorJuergen Gross <jgross@suse.com>2019-10-21 08:30:52 +0300
committerJakub Kicinski <jakub.kicinski@netronome.com>2019-10-22 19:52:04 +0300
commit2ac061ce97f413bfbbdd768f7d2e0fda2e8170df (patch)
tree80105c4b99633cddd6a359df05cc6ce496ca8b71 /drivers/net/xen-netback
parent88238d2d225b2830706a941adbb5326b581eb6eb (diff)
downloadlinux-2ac061ce97f413bfbbdd768f7d2e0fda2e8170df.tar.xz
xen/netback: cleanup init and deinit code
Do some cleanup of the netback init and deinit code: - add an omnipotent queue deinit function usable from xenvif_disconnect_data() and the error path of xenvif_connect_data() - only install the irq handlers after initializing all relevant items (especially the kthreads related to the queue) - there is no need to use get_task_struct() after creating a kthread and using put_task_struct() again after having stopped it. - use kthread_run() instead of kthread_create() to spare the call of wake_up_process(). Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Paul Durrant <pdurrant@gmail.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Diffstat (limited to 'drivers/net/xen-netback')
-rw-r--r--drivers/net/xen-netback/interface.c114
1 files changed, 54 insertions, 60 deletions
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 103ed00775eb..68dd7bb07ca6 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -626,6 +626,38 @@ err:
return err;
}
+static void xenvif_disconnect_queue(struct xenvif_queue *queue)
+{
+ if (queue->tx_irq) {
+ unbind_from_irqhandler(queue->tx_irq, queue);
+ if (queue->tx_irq == queue->rx_irq)
+ queue->rx_irq = 0;
+ queue->tx_irq = 0;
+ }
+
+ if (queue->rx_irq) {
+ unbind_from_irqhandler(queue->rx_irq, queue);
+ queue->rx_irq = 0;
+ }
+
+ if (queue->task) {
+ kthread_stop(queue->task);
+ queue->task = NULL;
+ }
+
+ if (queue->dealloc_task) {
+ kthread_stop(queue->dealloc_task);
+ queue->dealloc_task = NULL;
+ }
+
+ if (queue->napi.poll) {
+ netif_napi_del(&queue->napi);
+ queue->napi.poll = NULL;
+ }
+
+ xenvif_unmap_frontend_data_rings(queue);
+}
+
int xenvif_connect_data(struct xenvif_queue *queue,
unsigned long tx_ring_ref,
unsigned long rx_ring_ref,
@@ -651,13 +683,27 @@ int xenvif_connect_data(struct xenvif_queue *queue,
netif_napi_add(queue->vif->dev, &queue->napi, xenvif_poll,
XENVIF_NAPI_WEIGHT);
+ queue->stalled = true;
+
+ task = kthread_run(xenvif_kthread_guest_rx, queue,
+ "%s-guest-rx", queue->name);
+ if (IS_ERR(task))
+ goto kthread_err;
+ queue->task = task;
+
+ task = kthread_run(xenvif_dealloc_kthread, queue,
+ "%s-dealloc", queue->name);
+ if (IS_ERR(task))
+ goto kthread_err;
+ queue->dealloc_task = task;
+
if (tx_evtchn == rx_evtchn) {
/* feature-split-event-channels == 0 */
err = bind_interdomain_evtchn_to_irqhandler(
queue->vif->domid, tx_evtchn, xenvif_interrupt, 0,
queue->name, queue);
if (err < 0)
- goto err_unmap;
+ goto err;
queue->tx_irq = queue->rx_irq = err;
disable_irq(queue->tx_irq);
} else {
@@ -668,7 +714,7 @@ int xenvif_connect_data(struct xenvif_queue *queue,
queue->vif->domid, tx_evtchn, xenvif_tx_interrupt, 0,
queue->tx_irq_name, queue);
if (err < 0)
- goto err_unmap;
+ goto err;
queue->tx_irq = err;
disable_irq(queue->tx_irq);
@@ -678,47 +724,18 @@ int xenvif_connect_data(struct xenvif_queue *queue,
queue->vif->domid, rx_evtchn, xenvif_rx_interrupt, 0,
queue->rx_irq_name, queue);
if (err < 0)
- goto err_tx_unbind;
+ goto err;
queue->rx_irq = err;
disable_irq(queue->rx_irq);
}
- queue->stalled = true;
-
- task = kthread_create(xenvif_kthread_guest_rx,
- (void *)queue, "%s-guest-rx", queue->name);
- if (IS_ERR(task)) {
- pr_warn("Could not allocate kthread for %s\n", queue->name);
- err = PTR_ERR(task);
- goto err_rx_unbind;
- }
- queue->task = task;
- get_task_struct(task);
-
- task = kthread_create(xenvif_dealloc_kthread,
- (void *)queue, "%s-dealloc", queue->name);
- if (IS_ERR(task)) {
- pr_warn("Could not allocate kthread for %s\n", queue->name);
- err = PTR_ERR(task);
- goto err_rx_unbind;
- }
- queue->dealloc_task = task;
-
- wake_up_process(queue->task);
- wake_up_process(queue->dealloc_task);
-
return 0;
-err_rx_unbind:
- unbind_from_irqhandler(queue->rx_irq, queue);
- queue->rx_irq = 0;
-err_tx_unbind:
- unbind_from_irqhandler(queue->tx_irq, queue);
- queue->tx_irq = 0;
-err_unmap:
- xenvif_unmap_frontend_data_rings(queue);
- netif_napi_del(&queue->napi);
+kthread_err:
+ pr_warn("Could not allocate kthread for %s\n", queue->name);
+ err = PTR_ERR(task);
err:
+ xenvif_disconnect_queue(queue);
return err;
}
@@ -746,30 +763,7 @@ void xenvif_disconnect_data(struct xenvif *vif)
for (queue_index = 0; queue_index < num_queues; ++queue_index) {
queue = &vif->queues[queue_index];
- netif_napi_del(&queue->napi);
-
- if (queue->task) {
- kthread_stop(queue->task);
- put_task_struct(queue->task);
- queue->task = NULL;
- }
-
- if (queue->dealloc_task) {
- kthread_stop(queue->dealloc_task);
- queue->dealloc_task = NULL;
- }
-
- if (queue->tx_irq) {
- if (queue->tx_irq == queue->rx_irq)
- unbind_from_irqhandler(queue->tx_irq, queue);
- else {
- unbind_from_irqhandler(queue->tx_irq, queue);
- unbind_from_irqhandler(queue->rx_irq, queue);
- }
- queue->tx_irq = 0;
- }
-
- xenvif_unmap_frontend_data_rings(queue);
+ xenvif_disconnect_queue(queue);
}
xenvif_mcast_addr_list_free(vif);