search for: vring_desc_f_batch_next

...1.0 allows passing a batch of descriptors in both directions, by > incrementing the used/avail index by values > 1. We can support this by > chaining a list of descriptors through a bit the flags field. > To allow use together with s/g, a different bit will be used. > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > Batching works for both driver and device descriptors. I'm still not sure how this would be useful. It cannot be mandatory to set the bit, I think, because you don't know when the host/guest is going to read descriptors. So both host and guest always have to look ahead...

...ch of descriptors in both directions, by > > incrementing the used/avail index by values > 1. We can support this by > > chaining a list of descriptors through a bit the flags field. > > To allow use together with s/g, a different bit will be used. > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > Batching works for both driver and device descriptors. > > I'm still not sure how this would be useful. So this is used at least by virtio-net mergeable buffers to combine many buffers into a single packet. Similarly, on transmit linux sometimes supplies pa...

...ch of descriptors in both directions, by > > incrementing the used/avail index by values > 1. We can support this by > > chaining a list of descriptors through a bit the flags field. > > To allow use together with s/g, a different bit will be used. > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > Batching works for both driver and device descriptors. > > I'm still not sure how this would be useful. So this is used at least by virtio-net mergeable buffers to combine many buffers into a single packet. Similarly, on transmit linux sometimes supplies pa...

...hing descriptors: virtio 1.0 allows passing a batch of descriptors in both directions, by incrementing the used/avail index by values > 1. We can support this by chaining a list of descriptors through a bit the flags field. To allow use together with s/g, a different bit will be used. #define VRING_DESC_F_BATCH_NEXT 0x0010 Batching works for both driver and device descriptors. * Processing descriptors in and out of order Device processing all descriptors in order can simply flip the DESC_HW bit as it is done with descriptors. Device can write descriptors out in order as they are used, overwriting descrip...

...hing descriptors: virtio 1.0 allows passing a batch of descriptors in both directions, by incrementing the used/avail index by values > 1. We can support this by chaining a list of descriptors through a bit the flags field. To allow use together with s/g, a different bit will be used. #define VRING_DESC_F_BATCH_NEXT 0x0010 Batching works for both driver and device descriptors. * Processing descriptors in and out of order Device processing all descriptors in order can simply flip the DESC_HW bit as it is done with descriptors. Device can write descriptors out in order as they are used, overwriting descrip...

...1.0 allows passing a batch of descriptors in both directions, by > incrementing the used/avail index by values > 1. We can support this by > chaining a list of descriptors through a bit the flags field. > To allow use together with s/g, a different bit will be used. > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > Batching works for both driver and device descriptors. > > > > * Processing descriptors in and out of order > > Device processing all descriptors in order can simply flip > the DESC_HW bit as it is done with descriptors. > > Device can write descrip...

...hing descriptors: virtio 1.0 allows passing a batch of descriptors in both directions, by incrementing the used/avail index by values > 1. We can support this by chaining a list of descriptors through a bit the flags field. To allow use together with s/g, a different bit will be used. #define VRING_DESC_F_BATCH_NEXT 0x0010 Batching works for both driver and device descriptors. * Processing descriptors in and out of order Device processing all descriptors in order can simply flip the DESC_HW bit as it is done with descriptors. Device can write descriptors out in order as they are used, overwriting descrip...

...hing descriptors: virtio 1.0 allows passing a batch of descriptors in both directions, by incrementing the used/avail index by values > 1. We can support this by chaining a list of descriptors through a bit the flags field. To allow use together with s/g, a different bit will be used. #define VRING_DESC_F_BATCH_NEXT 0x0010 Batching works for both driver and device descriptors. * Processing descriptors in and out of order Device processing all descriptors in order can simply flip the DESC_HW bit as it is done with descriptors. Device can write descriptors out in order as they are used, overwriting descrip...

...h directions, by > > > incrementing the used/avail index by values > 1. We can support this by > > > chaining a list of descriptors through a bit the flags field. > > > To allow use together with s/g, a different bit will be used. > > > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > > > Batching works for both driver and device descriptors. > > > > > > > > > > > > * Processing descriptors in and out of order > > > > > > Device processing all descriptors in order can simply flip > > &gt...

...h directions, by > > > incrementing the used/avail index by values > 1. We can support this by > > > chaining a list of descriptors through a bit the flags field. > > > To allow use together with s/g, a different bit will be used. > > > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > > > Batching works for both driver and device descriptors. > > > > > > > > > > > > * Processing descriptors in and out of order > > > > > > Device processing all descriptors in order can simply flip > > &gt...

...ch of descriptors in both directions, by > > incrementing the used/avail index by values > 1. We can support this by > > chaining a list of descriptors through a bit the flags field. > > To allow use together with s/g, a different bit will be used. > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > Batching works for both driver and device descriptors. > > > > > > > > * Processing descriptors in and out of order > > > > Device processing all descriptors in order can simply flip > > the DESC_HW bit as it is done with des...

...ch of descriptors in both directions, by > > incrementing the used/avail index by values > 1. We can support this by > > chaining a list of descriptors through a bit the flags field. > > To allow use together with s/g, a different bit will be used. > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > Batching works for both driver and device descriptors. > > Honestly, I don't think it's an efficient way for batching. Neither the > DESC_F_NEXT nor the BATCH_NEXT tells us how many new descs are there > for processing: it's just a hint that ther...

...ch of descriptors in both directions, by > > incrementing the used/avail index by values > 1. We can support this by > > chaining a list of descriptors through a bit the flags field. > > To allow use together with s/g, a different bit will be used. > > > > #define VRING_DESC_F_BATCH_NEXT 0x0010 > > > > Batching works for both driver and device descriptors. > > Honestly, I don't think it's an efficient way for batching. Neither the > DESC_F_NEXT nor the BATCH_NEXT tells us how many new descs are there > for processing: it's just a hint that ther...