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Message-ID: <20250423140931-mutt-send-email-mst@kernel.org>
Date: Wed, 23 Apr 2025 14:24:42 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Mina Almasry <almasrymina@...gle.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, io-uring@...r.kernel.org,
virtualization@...ts.linux.dev, kvm@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Donald Hunter <donald.hunter@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
Simon Horman <horms@...nel.org>, Jonathan Corbet <corbet@....net>,
Andrew Lunn <andrew+netdev@...n.ch>,
Jeroen de Borst <jeroendb@...gle.com>,
Harshitha Ramamurthy <hramamurthy@...gle.com>,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Willem de Bruijn <willemb@...gle.com>, Jens Axboe <axboe@...nel.dk>,
Pavel Begunkov <asml.silence@...il.com>,
David Ahern <dsahern@...nel.org>,
Neal Cardwell <ncardwell@...gle.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Stefano Garzarella <sgarzare@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
Eugenio Pérez <eperezma@...hat.com>,
Shuah Khan <shuah@...nel.org>, sdf@...ichev.me, dw@...idwei.uk,
Jamal Hadi Salim <jhs@...atatu.com>,
Victor Nogueira <victor@...atatu.com>,
Pedro Tammela <pctammela@...atatu.com>,
Samiullah Khawaja <skhawaja@...gle.com>,
Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [PATCH net-next v10 4/9] net: devmem: Implement TX path
some nits
On Wed, Apr 23, 2025 at 03:11:11AM +0000, Mina Almasry wrote:
> @@ -189,43 +200,44 @@ net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd,
> }
>
> binding->dev = dev;
> -
> - err = xa_alloc_cyclic(&net_devmem_dmabuf_bindings, &binding->id,
> - binding, xa_limit_32b, &id_alloc_next,
> - GFP_KERNEL);
> - if (err < 0)
> - goto err_free_binding;
> -
> xa_init_flags(&binding->bound_rxqs, XA_FLAGS_ALLOC);
> -
> refcount_set(&binding->ref, 1);
> -
> binding->dmabuf = dmabuf;
>
given you keep iterating, don't tweak whitespace in the same patch-
will make the review a tiny bit easier.
> binding->attachment = dma_buf_attach(binding->dmabuf, dev->dev.parent);
> if (IS_ERR(binding->attachment)) {
> err = PTR_ERR(binding->attachment);
> NL_SET_ERR_MSG(extack, "Failed to bind dmabuf to device");
> - goto err_free_id;
> + goto err_free_binding;
> }
>
> binding->sgt = dma_buf_map_attachment_unlocked(binding->attachment,
> - DMA_FROM_DEVICE);
> + direction);
> if (IS_ERR(binding->sgt)) {
> err = PTR_ERR(binding->sgt);
> NL_SET_ERR_MSG(extack, "Failed to map dmabuf attachment");
> goto err_detach;
> }
>
> + if (direction == DMA_TO_DEVICE) {
> + binding->tx_vec = kvmalloc_array(dmabuf->size / PAGE_SIZE,
> + sizeof(struct net_iov *),
> + GFP_KERNEL);
> + if (!binding->tx_vec) {
> + err = -ENOMEM;
> + goto err_unmap;
> + }
> + }
> +
> /* For simplicity we expect to make PAGE_SIZE allocations, but the
> * binding can be much more flexible than that. We may be able to
> * allocate MTU sized chunks here. Leave that for future work...
> */
> - binding->chunk_pool =
> - gen_pool_create(PAGE_SHIFT, dev_to_node(&dev->dev));
> + binding->chunk_pool = gen_pool_create(PAGE_SHIFT,
> + dev_to_node(&dev->dev));
> if (!binding->chunk_pool) {
> err = -ENOMEM;
> - goto err_unmap;
> + goto err_tx_vec;
> }
>
> virtual = 0;
> @@ -270,24 +282,34 @@ net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd,
> niov->owner = &owner->area;
> page_pool_set_dma_addr_netmem(net_iov_to_netmem(niov),
> net_devmem_get_dma_addr(niov));
> + if (direction == DMA_TO_DEVICE)
> + binding->tx_vec[owner->area.base_virtual / PAGE_SIZE + i] = niov;
> }
>
> virtual += len;
> }
>
> + err = xa_alloc_cyclic(&net_devmem_dmabuf_bindings, &binding->id,
> + binding, xa_limit_32b, &id_alloc_next,
> + GFP_KERNEL);
> + if (err < 0)
> + goto err_free_id;
> +
> return binding;
>
> +err_free_id:
> + xa_erase(&net_devmem_dmabuf_bindings, binding->id);
> err_free_chunks:
> gen_pool_for_each_chunk(binding->chunk_pool,
> net_devmem_dmabuf_free_chunk_owner, NULL);
> gen_pool_destroy(binding->chunk_pool);
> +err_tx_vec:
> + kvfree(binding->tx_vec);
> err_unmap:
> dma_buf_unmap_attachment_unlocked(binding->attachment, binding->sgt,
> DMA_FROM_DEVICE);
> err_detach:
> dma_buf_detach(dmabuf, binding->attachment);
> -err_free_id:
> - xa_erase(&net_devmem_dmabuf_bindings, binding->id);
> err_free_binding:
> kfree(binding);
> err_put_dmabuf:
> @@ -295,6 +317,21 @@ net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd,
> return ERR_PTR(err);
> }
>
> +struct net_devmem_dmabuf_binding *net_devmem_lookup_dmabuf(u32 id)
> +{
> + struct net_devmem_dmabuf_binding *binding;
> +
> + rcu_read_lock();
> + binding = xa_load(&net_devmem_dmabuf_bindings, id);
> + if (binding) {
> + if (!net_devmem_dmabuf_binding_get(binding))
> + binding = NULL;
> + }
> + rcu_read_unlock();
> +
> + return binding;
> +}
> +
> void net_devmem_get_net_iov(struct net_iov *niov)
> {
> net_devmem_dmabuf_binding_get(net_devmem_iov_binding(niov));
> @@ -305,6 +342,53 @@ void net_devmem_put_net_iov(struct net_iov *niov)
> net_devmem_dmabuf_binding_put(net_devmem_iov_binding(niov));
> }
>
> +struct net_devmem_dmabuf_binding *net_devmem_get_binding(struct sock *sk,
> + unsigned int dmabuf_id)
> +{
> + struct net_devmem_dmabuf_binding *binding;
> + struct dst_entry *dst = __sk_dst_get(sk);
> + int err = 0;
> +
> + binding = net_devmem_lookup_dmabuf(dmabuf_id);
why not initialize binding together with the declaration?
> + if (!binding || !binding->tx_vec) {
> + err = -EINVAL;
> + goto out_err;
> + }
> +
> + /* The dma-addrs in this binding are only reachable to the corresponding
> + * net_device.
> + */
> + if (!dst || !dst->dev || dst->dev->ifindex != binding->dev->ifindex) {
> + err = -ENODEV;
> + goto out_err;
> + }
> +
> + return binding;
> +
> +out_err:
> + if (binding)
> + net_devmem_dmabuf_binding_put(binding);
> +
> + return ERR_PTR(err);
> +}
> +
> +struct net_iov *
> +net_devmem_get_niov_at(struct net_devmem_dmabuf_binding *binding,
> + size_t virt_addr, size_t *off, size_t *size)
> +{
> + size_t idx;
> +
> + if (virt_addr >= binding->dmabuf->size)
> + return NULL;
> +
> + idx = virt_addr / PAGE_SIZE;
init this at where it's declared?
or where it's used.
> +
> + *off = virt_addr % PAGE_SIZE;
> + *size = PAGE_SIZE - *off;
> +
> + return binding->tx_vec[idx];
> +}
> +
> /*** "Dmabuf devmem memory provider" ***/
>
> int mp_dmabuf_devmem_init(struct page_pool *pool)
--
MST
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