search for: virtio_net_f_guest_

...t; This patch also detects the small vring during probe, blocks some > > features that can't be used with small vrings, and fails probe, > > leading to a reset and features re-negotiation. > > > > Features that can't be used with small vrings: > > GRO features (VIRTIO_NET_F_GUEST_*): > > When we use small vrings, we may not have enough entries in the ring to > > chain page size buffers and form a 64K buffer. > > So we may need to allocate 64k of continuous memory, which may be too > > much when the system is stressed. > > > > This patch al...

...api/linux/virtio_net.h b/include/uapi/linux/virtio_net.h index 7bbee79..ec32293 100644 --- a/include/uapi/linux/virtio_net.h +++ b/include/uapi/linux/virtio_net.h @@ -34,6 +34,7 @@ /* The feature bitmap for virtio net */ #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ +#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Dynamic offload configuration. */ #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ #define VIRTIO_NET_F_GUEST_TSO6 8 /* Gue...

...api/linux/virtio_net.h b/include/uapi/linux/virtio_net.h index 7bbee79..ec32293 100644 --- a/include/uapi/linux/virtio_net.h +++ b/include/uapi/linux/virtio_net.h @@ -34,6 +34,7 @@ /* The feature bitmap for virtio net */ #define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */ #define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */ +#define VIRTIO_NET_F_CTRL_GUEST_OFFLOADS 2 /* Dynamic offload configuration. */ #define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */ #define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */ #define VIRTIO_NET_F_GUEST_TSO6 8 /* Gue...

...single packet. > > This patch also detects the small vring during probe, blocks some > features that can't be used with small vrings, and fails probe, > leading to a reset and features re-negotiation. > > Features that can't be used with small vrings: > GRO features (VIRTIO_NET_F_GUEST_*): > When we use small vrings, we may not have enough entries in the ring to > chain page size buffers and form a 64K buffer. > So we may need to allocate 64k of continuous memory, which may be too > much when the system is stressed. > > This patch also fixes the MTU size in smal...

...descriptors we may need to handle a single packet. This patch also detects the small vring during probe, blocks some features that can't be used with small vrings, and fails probe, leading to a reset and features re-negotiation. Features that can't be used with small vrings: GRO features (VIRTIO_NET_F_GUEST_*): When we use small vrings, we may not have enough entries in the ring to chain page size buffers and form a 64K buffer. So we may need to allocate 64k of continuous memory, which may be too much when the system is stressed. This patch also fixes the MTU size in small vring cases to be up to the...

...s the small vring during probe, blocks some > > > features that can't be used with small vrings, and fails probe, > > > leading to a reset and features re-negotiation. > > > > > > Features that can't be used with small vrings: > > > GRO features (VIRTIO_NET_F_GUEST_*): > > > When we use small vrings, we may not have enough entries in the ring to > > > chain page size buffers and form a 64K buffer. > > > So we may need to allocate 64k of continuous memory, which may be too > > > much when the system is stressed. > > &gt...

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 -