From patchwork Thu May 30 20:16:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13680717 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ABB60158A34 for ; Thu, 30 May 2024 20:16:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717100194; cv=none; b=t+cY78e+9g0VcqwWnfEY/kP8SaUoOtP12a/zm2j+oTsRLB75bxXltGJ3/+KVTUTzhBypBljB+yWFqHc8V9AJViBHSur3jlqKVLNgjL1K8euktrj3QsD2CwP/duld4HUGUrxihIFO/LADj+eYejT5Ms+J4bQT3aFl8lJQKLvvcVM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717100194; c=relaxed/simple; bh=Hu0FjVl1gFa/8dhFCYbUZsIc9ri0T9CFII5ideQcIFs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=ZijwkxXz29lI8GLRTLN3K7+ri/jKrNO6G1yNn0xyfTr+nTBF9SKWCO8+MYtep7xC5+RhnmRLWqWnifLuoqKfDnf7pmU3cxawJovBx/G7JfOhTSMhbtgBE5V1UwtSShBMvk7hhvjc0FHqI4rqLJdHU4WxvXPsirafa/9yXxGqKYs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=N4sKed2C; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--almasrymina.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="N4sKed2C" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-df7a6530373so2462703276.0 for ; Thu, 30 May 2024 13:16:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1717100188; x=1717704988; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=fJezY8wdxWRfmac6akns8Apc8oSMwrJC7c4ob0ReNSk=; b=N4sKed2CmRcljlyV+toK7tsW1H+iFE8n6xWZm3ldl6TwHEbAMdJCC/hTAWgFhGrfHG kfpHMEDMCb8/tgmHYZFZUI/a3qYMSHMAcxtbsC+w3Tu1x593pW+MCzTup7UMuQGDfnXc ByPGVrbVDG6i87TSh2Ia9DWZOwMl47zvdjTxfh1poOkie8UNp9WsZ4Vvz25btOOFh0zN 9dBZLaLDAqkEDwpB10hf7647NwwqX3c+lrcz6SgANM5ue/uynXPo5n5Z27WdjfnhgIUz 1svYsr4eaXl4KtEm0CKR06wPm+D+1oTZVPT+ftp+orbopMutgXja3vnDWu5DAsWw0Q+9 ex7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717100188; x=1717704988; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=fJezY8wdxWRfmac6akns8Apc8oSMwrJC7c4ob0ReNSk=; b=TpCXJb/AgTw5GbTDiifO2CT0OElE3aFVC/XYS3vI8376n3D5M7ELKTl6XB4NQ5DKTu jyVRG+KqcCRHx1P4+RGltwTqrOXgQrcjAUU5cq06PsapF1Fg34tAxvCSHXzwpm4FRYh4 2F5X4wovl+gdcazgmJwQv0fhmnZOvo1K12WHpR0sbRg8Y5LuPO1svk3UrNmNEnZATJaO TOh4QUEyv/6gz3nfXHrQZT8HtDX4Yxv0mVglCjq7d5+lvlRd6D86FORUcoGEh3GxrZf9 VuUGa5P5/1Q4KEfAez6HKZJcD2A8qnHBRGrEGljrBA5xuf4f+IZC0L05BxrNQZ/fS668 LMfQ== X-Forwarded-Encrypted: i=1; AJvYcCVzrEB0X4k2u5+IMu4xfi7vbtfs/VNU5QZ4k6IdjDSdN6HrMd0ra+8kH20FnsR7VeyfkCrJAZeVI1ZgAJ6MRV7l+M8J X-Gm-Message-State: AOJu0YzIWPI+GT2IVD5SDMVqlmPGNVJLN4en8Yb2T/XkslVXPXtfh7Hi EvxNP8Yc9wQiuFJohV7yR9FHwl6Crs0KDfOzexYMlIOl3OFuyuhACGTuLBt9dMxO0LOmjHi0D64 U2k+TduQL9A3ExEZaeTsNhg== X-Google-Smtp-Source: AGHT+IGLH8v6DYaWCCXmuo3SfXwicZXKpDSrR7TFIqxtlWBWMsxgrE7NkX18ouqVyKzKvSM/xxjVMZ0xTvwG0Yun/A== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:6902:1204:b0:df7:9df5:4bbc with SMTP id 3f1490d57ef6-dfa721306ddmr2739276.0.1717100188155; Thu, 30 May 2024 13:16:28 -0700 (PDT) Date: Thu, 30 May 2024 20:16:04 +0000 In-Reply-To: <20240530201616.1316526-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240530201616.1316526-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.1.288.g0e0cd299f1-goog Message-ID: <20240530201616.1316526-6-almasrymina@google.com> Subject: [PATCH net-next v10 05/14] netdev: netdevice devmem allocator From: Mina Almasry To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-alpha@vger.kernel.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arch@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Donald Hunter , Jonathan Corbet , Richard Henderson , Ivan Kokshaysky , Matt Turner , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Andreas Larsson , Jesper Dangaard Brouer , Ilias Apalodimas , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Pavel Begunkov , David Wei , Jason Gunthorpe , Yunsheng Lin , Shailend Chand , Harshitha Ramamurthy , Shakeel Butt , Jeroen de Borst , Praveen Kaligineedi , Willem de Bruijn , Kaiyuan Zhang X-Patchwork-Delegate: kuba@kernel.org 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 Signed-off-by: Kaiyuan Zhang Signed-off-by: Mina Almasry --- 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 | 18 ++++++++++++++++++ net/core/devmem.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index fa03bdabdffd9..cd3186f5d1fbd 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -68,7 +68,20 @@ int net_devmem_bind_dmabuf(struct net_device *dev, unsigned int dmabuf_fd, void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding); int net_devmem_bind_dmabuf_to_queue(struct net_device *dev, u32 rxq_idx, struct net_devmem_dmabuf_binding *binding); +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 72e932a1a9489..01dbdd216fae7 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -14,8 +14,26 @@ struct net_iov { struct dmabuf_genpool_chunk_owner *owner; + unsigned long dma_addr; }; +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 d82f92d7cf9ce..d5fac8edf621d 100644 --- a/net/core/devmem.c +++ b/net/core/devmem.c @@ -32,6 +32,14 @@ static void net_devmem_dmabuf_free_chunk_owner(struct gen_pool *genpool, kfree(owner); } +static inline 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; @@ -54,6 +62,42 @@ 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]; + + niov->dma_addr = 0; + + net_devmem_dmabuf_binding_get(binding); + + 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 (gen_pool_has_addr(binding->chunk_pool, dma_addr, PAGE_SIZE)) + gen_pool_free(binding->chunk_pool, dma_addr, PAGE_SIZE); + + net_devmem_dmabuf_binding_put(binding); +} + /* Protected by rtnl_lock() */ static DEFINE_XARRAY_FLAGS(net_devmem_dmabuf_bindings, XA_FLAGS_ALLOC1);