On Mon, 5 Aug 2024 21:25:17 +0000 Mina Almasry wrote:
quoted hunk ↗ jump to hunk
+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?