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[2a03:2880:ff:74::face:b00c]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20d1804b734sm31677265ad.222.2024.10.16.11.53.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Oct 2024 11:53:05 -0700 (PDT) From: David Wei To: io-uring@vger.kernel.org, netdev@vger.kernel.org Cc: David Wei , Jens Axboe , Pavel Begunkov , Jakub Kicinski , Paolo Abeni , "David S. Miller" , Eric Dumazet , Jesper Dangaard Brouer , David Ahern , Mina Almasry , Stanislav Fomichev , Joe Damato , Pedro Tammela Subject: [PATCH v6 04/15] net: prepare for non devmem TCP memory providers Date: Wed, 16 Oct 2024 11:52:41 -0700 Message-ID: <20241016185252.3746190-5-dw@davidwei.uk> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241016185252.3746190-1-dw@davidwei.uk> References: <20241016185252.3746190-1-dw@davidwei.uk> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Pavel Begunkov There is a good bunch of places in generic paths assuming that the only page pool memory provider is devmem TCP. As we want to reuse the net_iov and provider infrastructure, we need to patch it up and explicitly check the provider type when we branch into devmem TCP code. Signed-off-by: Pavel Begunkov Signed-off-by: David Wei --- net/core/devmem.c | 10 ++++++++-- net/core/devmem.h | 8 ++++++++ net/core/page_pool_user.c | 15 +++++++++------ net/ipv4/tcp.c | 6 ++++++ 4 files changed, 31 insertions(+), 8 deletions(-) diff --git a/net/core/devmem.c b/net/core/devmem.c index 01738029e35c..78983a98e5dc 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -28,6 +28,12 @@ static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1); static const struct memory_provider_ops dmabuf_devmem_ops; +bool net_is_devmem_page_pool_ops(const struct memory_provider_ops *ops) +{ + return ops == &dmabuf_devmem_ops; +} +EXPORT_SYMBOL_GPL(net_is_devmem_page_pool_ops); + static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool, struct gen_pool_chunk *chunk, void *not_used) @@ -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); diff --git a/net/core/devmem.h b/net/core/devmem.h index a2b9913e9a17..a3fdd66bb05b 100644 --- a/net/core/devmem.h +++ b/net/core/devmem.h @@ -116,6 +116,8 @@ struct net_iov * net_devmem_alloc_dmabuf(struct net_devmem_dmabuf_binding *binding); void net_devmem_free_dmabuf(struct net_iov *ppiov); +bool net_is_devmem_page_pool_ops(const struct memory_provider_ops *ops); + #else struct net_devmem_dmabuf_binding; @@ -168,6 +170,12 @@ static inline u32 net_devmem_iov_binding_id(const struct net_iov *niov) { return 0; } + +static inline bool +net_is_devmem_page_pool_ops(const struct memory_provider_ops *ops) +{ + return false; +} #endif #endif /* _NET_DEVMEM_H */ diff --git a/net/core/page_pool_user.c b/net/core/page_pool_user.c index 48335766c1bf..604862a73535 100644 --- a/net/core/page_pool_user.c +++ b/net/core/page_pool_user.c @@ -214,7 +214,7 @@ static int page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool, const struct genl_info *info) { - struct net_devmem_dmabuf_binding *binding = pool->mp_priv; + struct net_devmem_dmabuf_binding *binding; size_t inflight, refsz; void *hdr; @@ -244,8 +244,11 @@ page_pool_nl_fill(struct sk_buff *rsp, const struct page_pool *pool, pool->user.detach_time)) goto err_cancel; - 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; + } 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)) { diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e928efc22f80..31e01da61c12 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -277,6 +277,7 @@ #include #include #include +#include #include #include @@ -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)) { + err = -ENODEV; + goto out; + } + end = start + skb_frag_size(frag); copy = end - offset;