search for: virtqueue_enable_cb_urg

...here is an urgent descriptor. > /** > * virtqueue_poll - query pending used buffers > * @vq: the struct virtqueue we're talking about. > @@ -662,6 +721,14 @@ bool virtqueue_enable_cb(struct virtqueue *_vq) > } > EXPORT_SYMBOL_GPL(virtqueue_enable_cb); > > +bool virtqueue_enable_cb_urgent(struct virtqueue *_vq) > +{ > + unsigned last_used_idx = virtqueue_enable_cb_prepare_urgent(_vq); > + > + return !virtqueue_poll(_vq, last_used_idx); > +} > +EXPORT_SYMBOL_GPL(virtqueue_enable_cb_urgent); > + > /** > * virtqueue_enable_cb_delayed - restart callbacks...

...used_idx; +} +EXPORT_SYMBOL_GPL(virtqueue_enable_cb_prepare_urgent); + /** * virtqueue_poll - query pending used buffers * @vq: the struct virtqueue we're talking about. @@ -662,6 +721,14 @@ bool virtqueue_enable_cb(struct virtqueue *_vq) } EXPORT_SYMBOL_GPL(virtqueue_enable_cb); +bool virtqueue_enable_cb_urgent(struct virtqueue *_vq) +{ + unsigned last_used_idx = virtqueue_enable_cb_prepare_urgent(_vq); + + return !virtqueue_poll(_vq, last_used_idx); +} +EXPORT_SYMBOL_GPL(virtqueue_enable_cb_urgent); + /** * virtqueue_enable_cb_delayed - restart callbacks after disable_cb. * @vq: the struct virtqu...

...used_idx; +} +EXPORT_SYMBOL_GPL(virtqueue_enable_cb_prepare_urgent); + /** * virtqueue_poll - query pending used buffers * @vq: the struct virtqueue we're talking about. @@ -662,6 +721,14 @@ bool virtqueue_enable_cb(struct virtqueue *_vq) } EXPORT_SYMBOL_GPL(virtqueue_enable_cb); +bool virtqueue_enable_cb_urgent(struct virtqueue *_vq) +{ + unsigned last_used_idx = virtqueue_enable_cb_prepare_urgent(_vq); + + return !virtqueue_poll(_vq, last_used_idx); +} +EXPORT_SYMBOL_GPL(virtqueue_enable_cb_urgent); + /** * virtqueue_enable_cb_delayed - restart callbacks after disable_cb. * @vq: the struct virtqu...

Hello all: We free old transmitted packets in ndo_start_xmit() currently, so any packet must be orphaned also there. This was used to reduce the overhead of tx interrupt to achieve better performance. But this may not work for some protocols such as TCP stream. TCP depends on the value of sk_wmem_alloc to implement various optimization for small packets stream such as TCP small queue and auto

Hello all: We free old transmitted packets in ndo_start_xmit() currently, so any packet must be orphaned also there. This was used to reduce the overhead of tx interrupt to achieve better performance. But this may not work for some protocols such as TCP stream. TCP depends on the value of sk_wmem_alloc to implement various optimization for small packets stream such as TCP small queue and auto

...ust got used, free them then recheck. */ > - free_old_xmit_skbs(sq); > + free_old_xmit_skbs(sq, qsize); > if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { > netif_start_subqueue(dev, qnum); > virtqueue_disable_cb(sq->vq); > } > } > + } else if (virtqueue_enable_cb_urgent(sq->vq)) { > + free_old_xmit_skbs(sq, qsize); > } > > if (__netif_subqueue_stopped(dev, qnum) || !skb->xmit_more) > @@ -1132,8 +1214,10 @@ static int virtnet_close(struct net_device *dev) > /* Make sure refill_work doesn't re-enable napi! */ > cancel_del...

..._cb_delayed(sq->vq))) { /* More just got used, free them then recheck. */ - free_old_xmit_skbs(sq); + free_old_xmit_skbs(sq, qsize); if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { netif_start_subqueue(dev, qnum); virtqueue_disable_cb(sq->vq); } } + } else if (virtqueue_enable_cb_urgent(sq->vq)) { + free_old_xmit_skbs(sq, qsize); } if (__netif_subqueue_stopped(dev, qnum) || !skb->xmit_more) @@ -1132,8 +1214,10 @@ static int virtnet_close(struct net_device *dev) /* Make sure refill_work doesn't re-enable napi! */ cancel_delayed_work_sync(&vi->refill);...

..._cb_delayed(sq->vq))) { /* More just got used, free them then recheck. */ - free_old_xmit_skbs(sq); + free_old_xmit_skbs(sq, qsize); if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { netif_start_subqueue(dev, qnum); virtqueue_disable_cb(sq->vq); } } + } else if (virtqueue_enable_cb_urgent(sq->vq)) { + free_old_xmit_skbs(sq, qsize); } if (__netif_subqueue_stopped(dev, qnum) || !skb->xmit_more) @@ -1132,8 +1214,10 @@ static int virtnet_close(struct net_device *dev) /* Make sure refill_work doesn't re-enable napi! */ cancel_delayed_work_sync(&vi->refill);...