[dpdk-dev] [PATCH v9 3/8] net/virtio: add packed virtqueue helpers
Jens Freimann
jfreimann at redhat.com
Thu Oct 25 16:40:46 CEST 2018
On Thu, Oct 25, 2018 at 05:23:53PM +0800, Tiwei Bie wrote:
>On Wed, Oct 24, 2018 at 04:32:31PM +0200, Jens Freimann wrote:
>> Add helper functions to set/clear and check descriptor flags.
>>
>> Signed-off-by: Jens Freimann <jfreimann at redhat.com>
>> ---
>> drivers/net/virtio/virtio_ring.h | 26 ++++++++++++++++++++++++++
>> 1 file changed, 26 insertions(+)
>>
>> diff --git a/drivers/net/virtio/virtio_ring.h b/drivers/net/virtio/virtio_ring.h
>> index f84ab5e34..629d3477a 100644
>> --- a/drivers/net/virtio/virtio_ring.h
>> +++ b/drivers/net/virtio/virtio_ring.h
>> @@ -77,6 +77,8 @@ struct vring_packed_desc_event {
>>
>> struct vring {
>> unsigned int num;
>> + unsigned int avail_wrap_counter;
>> + unsigned int used_wrap_counter;
>
>Above fields should be defined in struct virtqueue.
ok
regards,
Jens
>
>> union {
>> struct vring_desc_packed *desc_packed;
>> struct vring_desc *desc;
>> @@ -91,6 +93,30 @@ struct vring {
>> };
>> };
>>
>> +static inline void
>> +_set_desc_avail(struct vring_desc_packed *desc, int wrap_counter)
>> +{
>> + desc->flags |= VRING_DESC_F_AVAIL(wrap_counter) |
>> + VRING_DESC_F_USED(!wrap_counter);
>> +}
>> +
>> +static inline void
>> +set_desc_avail(struct vring *vr, struct vring_desc_packed *desc)
>> +{
>> + _set_desc_avail(desc, vr->avail_wrap_counter);
>> +}
>> +
>> +static inline int
>> +desc_is_used(struct vring_desc_packed *desc, struct vring *vr)
>> +{
>> + uint16_t used, flags;
>> +
>> + flags = desc->flags;
>> + used = !!(flags & VRING_DESC_F_USED(1));
>> +
>> + return used == vr->used_wrap_counter;
>> +}
>> +
>> /* The standard layout for the ring is a continuous chunk of memory which
>> * looks like this. We assume num is a power of 2.
>> *
>> --
>> 2.17.1
>>
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