Displaying 3 results from an estimated 3 matches for "max_frags".
2023 Apr 30
1
[RFC PATCH net 2/3] virtio-net: allow usage of vrings smaller than MAX_SKB_FRAGS + 2
...PU hotplug instances for online & dead */
struct hlist_node node;
struct hlist_node node_dead;
@@ -455,6 +463,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
unsigned int copy, hdr_len, hdr_padded_len;
struct page *page_to_free = NULL;
int tailroom, shinfo_size;
+ u16 max_frags = MAX_SKB_FRAGS;
char *p, *hdr_p, *buf;
p = page_address(page) + offset;
@@ -520,7 +529,10 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
* tries to receive more than is possible. This is usually
* the case of a broken device.
*/
- if (unlikely(len > MAX_SKB_FRAGS...
2023 Apr 30
1
[RFC PATCH net 2/3] virtio-net: allow usage of vrings smaller than MAX_SKB_FRAGS + 2
...need bool svring? can't we just check single_pkt_max_descs
all the time?
> @@ -455,6 +463,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> unsigned int copy, hdr_len, hdr_padded_len;
> struct page *page_to_free = NULL;
> int tailroom, shinfo_size;
> + u16 max_frags = MAX_SKB_FRAGS;
> char *p, *hdr_p, *buf;
>
> p = page_address(page) + offset;
> @@ -520,7 +529,10 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
> * tries to receive more than is possible. This is usually
> * the case of a broken device.
> */
>...
2023 Apr 30
5
[RFC PATCH net 0/3] virtio-net: allow usage of small vrings
At the moment, if a virtio network device uses vrings with less than
MAX_SKB_FRAGS + 2 entries, the device won't be functional.
The following condition vq->num_free >= 2 + MAX_SKB_FRAGS will always
evaluate to false, leading to TX timeouts.
This patchset attempts this fix this bug, and to allow small rings down
to 4 entries.
The first patch introduces a new mechanism in virtio core -