Implement netdev devmem allocator. The allocator takes a given struct netdev_dmabuf_binding as input and allocates net_iov from that binding.
The allocation simply delegates to the binding's genpool for the allocation logic and wraps the returned memory region in a net_iov struct.
Signed-off-by: Willem de Bruijn willemb@google.com Signed-off-by: Kaiyuan Zhang kaiyuanz@google.com Signed-off-by: Mina Almasry almasrymina@google.com Reviewed-by: Pavel Begunkov asml.silence@gmail.com Reviewed-by: Jakub Kicinski kuba@kernel.org
---
v23: - WARN_ON when we don't see the dma_addr in the gen_pool (Jakub)
v20: - Removed dma_addr field in dmabuf_genpool_chunk_owner not used in this patch (moved to later patch where it's used).
v19: - Don't reset dma_addr on allocation/free (Jakub)
v17: - Don't acquire a binding ref for every allocation (Jakub).
v11: - Fix extraneous inline directive (Paolo)
v8: - Rename netdev_dmabuf_binding -> net_devmem_dmabuf_binding to avoid patch-by-patch build error. - Move niov->pp_magic/pp/pp_ref_counter usage to later patch to avoid patch-by-patch build error.
v7: - netdev_ -> net_devmem_* naming (Yunsheng).
v6: - Add comment on net_iov_dma_addr to explain why we don't use niov->dma_addr (Pavel) - Refactor new functions into net/core/devmem.c (Pavel)
v1: - Rename devmem -> dmabuf (David).
--- include/net/devmem.h | 13 +++++++++++++ include/net/netmem.h | 17 +++++++++++++++++ net/core/devmem.c | 41 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+)
diff --git a/include/net/devmem.h b/include/net/devmem.h index 3e406b6bfcf3..d315028c1499 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -73,7 +73,20 @@ int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct net_devmem_dmabuf_binding *binding, struct netlink_ext_ack *extack); void dev_dmabuf_uninstall(struct net_device *dev); +struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding); +void net_devmem_free_dmabuf(struct net_iov *ppiov); #else +static inline struct net_iov * +net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding) +{ + return NULL; +} + +static inline void net_devmem_free_dmabuf(struct net_iov *ppiov) +{ +} + static inline void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) { diff --git a/include/net/netmem.h b/include/net/netmem.h index 41e96c2f94b5..0fbc0999091a 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -16,6 +16,23 @@ struct net_iov { struct dmabuf_genpool_chunk_owner *owner; };
+static inline struct dmabuf_genpool_chunk_owner * +net_iov_owner(const struct net_iov *niov) +{ + return niov->owner; +} + +static inline unsigned int net_iov_idx(const struct net_iov *niov) +{ + return niov - net_iov_owner(niov)->niovs; +} + +static inline struct net_devmem_dmabuf_binding * +net_iov_binding(const struct net_iov *niov) +{ + return net_iov_owner(niov)->binding; +} + /* netmem */
/** diff --git a/net/core/devmem.c b/net/core/devmem.c index 3b8fa6a50147..ad222d108d37 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -33,6 +33,14 @@ static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool, kfree(owner); }
+static dma_addr_t net_devmem_get_dma_addr(const struct net_iov *niov) +{ + struct dmabuf_genpool_chunk_owner *owner = net_iov_owner(niov); + + return owner->base_dma_addr + + ((dma_addr_t)net_iov_idx(niov) << PAGE_SHIFT); +} + void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) { size_t size, avail; @@ -55,6 +63,39 @@ void __net_devmem_dmabuf_binding_free(struct net_devmem_dmabuf_binding *binding) kfree(binding); }
+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]; + + return niov; +} + +void net_devmem_free_dmabuf(struct net_iov *niov) +{ + struct net_devmem_dmabuf_binding *binding = net_iov_binding(niov); + unsigned long dma_addr = net_devmem_get_dma_addr(niov); + + if (WARN_ON(!gen_pool_has_addr(binding->chunk_pool, dma_addr, + PAGE_SIZE))) + return; + + gen_pool_free(binding->chunk_pool, dma_addr, PAGE_SIZE); +} + void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding) { struct netdev_rx_queue *rxq;