On Wed, 4 Dec 2024 09:21:43 -0800 David Wei wrote:
> +EXPORT_SYMBOL_GPL(net_is_devmem_page_pool_ops);
Export doesn't seem necessary, no module should need this right?
> @@ -316,10 +322,10 @@ void dev_dmabuf_uninstall(struct net_device *dev)
> unsigned int i;
>
> for (i = 0; i < dev->real_num_rx_queues; i++) {
> - binding = dev->_rx[i].mp_params.mp_priv;
> - if (!binding)
> + if (dev->_rx[i].mp_params.mp_ops != &dmabuf_devmem_ops)
> continue;
>
> + binding = dev->_rx[i].mp_params.mp_priv;
> xa_for_each(&binding->bound_rxqs, xa_idx, rxq)
> if (rxq == &dev->_rx[i]) {
> xa_erase(&binding->bound_rxqs, xa_idx);
Maybe add an op to mp_ops for queue unbinding?
Having an op struct and yet running code under if (ops == X) seems odd.
> - if (binding && nla_put_u32(rsp, NETDEV_A_PAGE_POOL_DMABUF, binding->id))
> - goto err_cancel;
> + if (net_is_devmem_page_pool_ops(pool->mp_ops)) {
> + binding = pool->mp_priv;
> + if (nla_put_u32(rsp, NETDEV_A_PAGE_POOL_DMABUF, binding->id))
> + goto err_cancel;
ditto, all mps should show up in page pool info. Even if it's just
an empty nest for now, waiting for attributes to be added later.
> + }
>
> genlmsg_end(rsp, hdr);
>
> @@ -353,16 +356,16 @@ void page_pool_unlist(struct page_pool *pool)
> int page_pool_check_memory_provider(struct net_device *dev,
> struct netdev_rx_queue *rxq)
> {
> - struct net_devmem_dmabuf_binding *binding = rxq->mp_params.mp_priv;
> + void *mp_priv = rxq->mp_params.mp_priv;
> struct page_pool *pool;
> struct hlist_node *n;
>
> - if (!binding)
> + if (!mp_priv)
> return 0;
>
> mutex_lock(&page_pools_lock);
> hlist_for_each_entry_safe(pool, n, &dev->page_pools, user.list) {
> - if (pool->mp_priv != binding)
> + if (pool->mp_priv != mp_priv)
> continue;
>
> if (pool->slow.queue_idx == get_netdev_rx_queue_index(rxq)) {
appears to be unrelated
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index b872de9a8271..f22005c70fd3 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -277,6 +277,7 @@
> #include <net/ip.h>
> #include <net/sock.h>
> #include <net/rstreason.h>
> +#include <net/page_pool/types.h>
types.h being needed to call a helper is unusual
> #include <linux/uaccess.h>
> #include <asm/ioctls.h>
> @@ -2476,6 +2477,11 @@ static int tcp_recvmsg_dmabuf(struct sock *sk, const struct sk_buff *skb,
> }
>
> niov = skb_frag_net_iov(frag);
> + if (net_is_devmem_page_pool_ops(niov->pp->mp_ops)) {
This one seems legit to me, FWIW, checking if its devmem in devmem
specific code is fine.
> + err = -ENODEV;
> + goto out;
> + }
> +
> end = start + skb_frag_size(frag);
> copy = end - offset;
>
