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[194.45.78.10]) by smtp.gmail.com with ESMTPSA id d20-20020a170906371400b0098e2eaec395sm5074876ejc.130.2023.07.14.00.43.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 14 Jul 2023 00:43:05 -0700 (PDT) From: Jesper Dangaard Brouer X-Google-Original-From: Jesper Dangaard Brouer Message-ID: <85bfa818-6856-e3ea-ef4d-16646c57d1cc@redhat.com> Date: Fri, 14 Jul 2023 09:43:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0 Cc: brouer@redhat.com, "linux-hyperv@vger.kernel.org" , "netdev@vger.kernel.org" , Dexuan Cui , KY Srinivasan , Paul Rosswurm , "olaf@aepfle.de" , "vkuznets@redhat.com" , "davem@davemloft.net" , "wei.liu@kernel.org" , "edumazet@google.com" , "pabeni@redhat.com" , "leon@kernel.org" , Long Li , "ssengar@linux.microsoft.com" , "linux-rdma@vger.kernel.org" , "daniel@iogearbox.net" , "john.fastabend@gmail.com" , "bpf@vger.kernel.org" , "ast@kernel.org" , Ajay Sharma , "hawk@kernel.org" , "tglx@linutronix.de" , "shradhagupta@linux.microsoft.com" , "linux-kernel@vger.kernel.org" , Ilias Apalodimas Subject: Re: [PATCH net-next] net: mana: Add page pool for RX buffers Content-Language: en-US To: Jakub Kicinski , Haiyang Zhang References: <1689259687-5231-1-git-send-email-haiyangz@microsoft.com> <20230713205326.5f960907@kernel.org> In-Reply-To: <20230713205326.5f960907@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On 14/07/2023 05.53, Jakub Kicinski wrote: > On Thu, 13 Jul 2023 14:48:45 +0000 Haiyang Zhang wrote: >> Add page pool for RX buffers for faster buffer cycle and reduce CPU >> usage. >> >> Get an extra ref count of a page after allocation, so after upper >> layers put the page, it's still referenced by the pool. We can reuse >> it as RX buffer without alloc a new page. > > Please use the real page_pool API from include/net/page_pool.h > We've moved past every driver reinventing the wheel, sorry. +1 Quoting[1]: Documentation/networking/page_pool.rst Basic use involves replacing alloc_pages() calls with the page_pool_alloc_pages() call. Drivers should use page_pool_dev_alloc_pages() replacing dev_alloc_pages(). [1] https://kernel.org/doc/html/latest/networking/page_pool.html