From patchwork Wed Jul 10 00:17:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mina Almasry X-Patchwork-Id: 13728668 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 826C3171C9 for ; Wed, 10 Jul 2024 00:18:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720570686; cv=none; b=BQ0YZGXxeGf/kc4p1n2xmYsTg4fI5RSbC141RoFmDlB7IUisPHPniYhHBske+UfMZhq04oQvaImdZcaqYemivKCmg1oTAw/fz0/3zYssx7jHEQ8PCbFmehOLeppB3+lTdfZLpGkOcssayEHzyRDlJSSlo3NaH6CnhQiQYvhZ6Ro= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720570686; c=relaxed/simple; bh=LLHQ3HbnPpet22C5MyZEESI3fBEiynuqZpZXrDgIX58=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=KQh9P83i3AjZv1kRpSQXtu9iLU8y9UTh5P2OdLQeMDvQQyIHMjlpDySvHz1j6nldgA2KnrWa5kdgFgfh4ILYUUO4GowWWPp3ZEjS1AspknGe/m/C51WJ6cdp0Rpo/5GoH6A8svN+6rapPHLIWBkG7Xego4L5tNN1Ikw/fjhXb2Y= 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=QswchFUm; arc=none smtp.client-ip=209.85.128.202 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="QswchFUm" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6590a57788aso25776797b3.2 for ; Tue, 09 Jul 2024 17:18:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1720570680; x=1721175480; 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=CNpxi9+INXBEIGdl8wMoYp3C8ca/EXV5Jcchtrj6leQ=; b=QswchFUmcYiMfhYVvS30OvpJnbwR+3sYCBrTcPIkTLHXcOp05QdoJkUa4S0GT6ZlCT yR1l8JtPfbdaZUk5KoasiykUq9veKvvOtTiS1DgUcsuwgmoUKyY3YOD8D7cYd75HXhhL zSX1lyIdaXG9q4lVdSHZLzOoenbdWwh6JLHma9av3n9FFpTirWlPxnSH6BW3W4kGkfAm BIPZIr0MjaDTc9Nk7FmAhfuhmD9p2F/M/5jliVgUTAtiEAF4MdFSE8kkwH9BXqQ4yEOf 43RHsfgIEpZ2CibXTTB+BO5KG18Rdtol7iTfVaVxIaSL9DbOVl8awWDVKQZScm2Y1E0/ 0oIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720570680; x=1721175480; 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=CNpxi9+INXBEIGdl8wMoYp3C8ca/EXV5Jcchtrj6leQ=; b=sTaDgFp228Q43+HZtp1STgAXjfzV4V/BEXSaNkGzT0jw1T6MGAR7KALD4Wub/3iEYp w9eBdqyWqg+DowlYCy0CupBDV8PyqZNeSuNtIePoQGhAGA5/dDRWQYRV2U4zPgnYYkGX bRdRZpDtKBAA8703qfS+JYTFrAS0MxdHf2FvoI+XfIshz8/X9T2oTF4nOPMKSqHGhTlr dAAPPj4LkYPN1TBTHaZu6piBE65jArz9l12SrO1abSfVl/+JiZvyHSS0ZLeGag3C6SOg ol5N23x1nIflPRvsjDLGj15Dm+p1Qx8r8Ptyt7q34LDhzIzBkOmN4DF01fmn4IHrBl+Q 32hw== X-Forwarded-Encrypted: i=1; AJvYcCU0cEwXNOA4zyQ0LUcZT2T1QFu9QXpkQw+kqzcYsluBiv4kk43QTL7XwcfCeXgTW7Izxd88Wm5kAcxQLJHEYOixXxYs X-Gm-Message-State: AOJu0Yww9wkTmWhd8qd5zUvFfsvxWUdo0frqyIdki0dLo3h+kkRLdix3 63enXvkBlWHa2XLx4ZmOA5r7Esvyw1GI2R75niAE25S/L6X1bEID33NcvlAnHS0O1+t1pVdWJZQ aRvKOXewqV8iGfwkQC5XswA== X-Google-Smtp-Source: AGHT+IFEr8yAagkDinAmiWCTRAvK+Q4tTdcX7w9J0vgsv84EzltKfPZuLUgRJ7OolDcXuRStp9WXzOhwRLWF03c1OQ== X-Received: from almasrymina.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4bc5]) (user=almasrymina job=sendgmr) by 2002:a05:690c:6e0a:b0:61b:791a:9850 with SMTP id 00721157ae682-658f167e9efmr1485917b3.9.1720570679945; Tue, 09 Jul 2024 17:17:59 -0700 (PDT) Date: Wed, 10 Jul 2024 00:17:37 +0000 In-Reply-To: <20240710001749.1388631-1-almasrymina@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240710001749.1388631-1-almasrymina@google.com> X-Mailer: git-send-email 2.45.2.803.g4e1b14247a-goog Message-ID: <20240710001749.1388631-5-almasrymina@google.com> Subject: [PATCH net-next v16 04/13] 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, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Mina Almasry , Donald Hunter , Jakub Kicinski , "David S. Miller" , Eric Dumazet , Paolo Abeni , 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 , Steffen Klassert , Herbert Xu , David Ahern , Willem de Bruijn , Shuah Khan , Sumit Semwal , " =?utf-8?q?Christian_K=C3=B6nig?= " , Bagas Sanjaya , Christoph Hellwig , Nikolay Aleksandrov , Taehee Yoo , 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 Reviewed-by: Pavel Begunkov --- 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 | 18 ++++++++++++++++++ net/core/devmem.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 75 insertions(+) diff --git a/include/net/devmem.h b/include/net/devmem.h index d090c3b205d8e..51b25ba193c96 100644 --- a/include/net/devmem.h +++ b/include/net/devmem.h @@ -68,7 +68,20 @@ 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 41e96c2f94b5c..664df8325ece5 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 1a603d5ec9278..e0ec4e406467c 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 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);