6 Aug
2024
6 Aug
'24
8:47 p.m.
On Mon, 5 Aug 2024 21:25:17 +0000 Mina Almasry wrote:
+struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding) +{
- struct dmabuf_genpool_chunk_owner *owner;
- unsigned long dma_addr;
- struct net_iov *niov;
- ssize_t offset;
- ssize_t index;
- dma_addr = gen_pool_alloc_owner(binding->chunk_pool, PAGE_SIZE,
(void **)&owner);- if (!dma_addr)
return NULL;- offset = dma_addr - owner->base_dma_addr;
- index = offset / PAGE_SIZE;
- niov = &owner->niovs[index];
- niov->dma_addr = 0;
Is the dma_addr not constant for a given niov for the entire lifetime of the binding? Why flip it back and forth between its value and 0?