From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 38DC328C5CC; Thu, 10 Jul 2025 08:28:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752136110; cv=none; b=HI9qwsqlAw+f3iCFhCakx4jHXQNh1xqEBQ5vQRJdaWYSTLzXciwEtCkxm42PGKBVQahktWntR2mk7YlAVheiRdq3lhs2H+fBX8yBhqcjak/M6NFw35+T9fWx6OArMCkmvtVVBn9VJ0LVtPA61T4UfZmwU1Wdc5GTf/nlZBihmTQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752136110; c=relaxed/simple; bh=hK1RRFRcd7Rb1RLo7hJ76BRYK9t+zQYYkhWzco8sIbk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=WRV3xbNp5+zp1vq6MgWnN3KUnA9nCZhUMGmn31D4si6dZ82rvJ3jCXaVuJtIQ+hxiH54HP4IsqiPurPQoIt6L0c6aYg0X5kFwW+Q/2mueX992zcwp8xNTdocZhnZdKe2ZLjoLegN1hB0S26839dkM2YyWykp2Q9K8ahaqXMISK4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-681ff7000002311f-02-686f79a11a2b From: Byungchul Park To: willy@infradead.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel_team@skhynix.com, kuba@kernel.org, almasrymina@google.com, ilias.apalodimas@linaro.org, harry.yoo@oracle.com, hawk@kernel.org, akpm@linux-foundation.org, davem@davemloft.net, john.fastabend@gmail.com, andrew+netdev@lunn.ch, asml.silence@gmail.com, toke@redhat.com, tariqt@nvidia.com, edumazet@google.com, pabeni@redhat.com, saeedm@nvidia.com, leon@kernel.org, ast@kernel.org, daniel@iogearbox.net, david@redhat.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, horms@kernel.org, linux-rdma@vger.kernel.org, bpf@vger.kernel.org, vishal.moola@gmail.com, hannes@cmpxchg.org, ziy@nvidia.com, jackmanb@google.com Subject: [PATCH net-next v9 5/8] netmem: introduce a netmem API, virt_to_head_netmem() Date: Thu, 10 Jul 2025 17:28:04 +0900 Message-Id: <20250710082807.27402-6-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250710082807.27402-1-byungchul@sk.com> References: <20250710082807.27402-1-byungchul@sk.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA02Sa0hTYRzGefe+O+c4XJyW6eleywgDzULtT0VEfXkpiiiK6EIOPbjRnDLL NItMhdhKu1hUm8W0MtuMxSqdtm66vJCUGNrMa5riBy/UangJalO6fHt4/s/veb78Oay4KZ3P aXTHRL1OpVUyMiIbCS6OLMlMUUePtBMospczYBvPgPu9TikUWSsQfJ/oYMHrrmfgTrEPQ9H7 PAI/7JMYBur6WLA5dkBP6SAB17lKDH0XGxjIz5vC8HxilIUcZ5kEmisKpHB18h6GyuxeFj5U FzHQXf5LCoM1+QQaTQ8I9BRshjpLKPjeDiNw2ysl4Ltwi4HCFgsD/Xk9CFpq+wiYzxYgsL/w SGFq3N9hftPNbg6ntcNjmD550C6hVaYullocx+njslXU6GnB1GE1MNTx7QpLO9tcDG24MUVo ldMrofm5owz9OvCJ0LEXrQy1P2kltMniZnfNPiDbmChqNemifvWmeJna3lWKUs8FZZhKDZJs VMsaURAn8DFC5f2xv9rsG2ACmuFXCh7PBA7oEH6N4O2rJ0Yk4zD/kBHc5R3TwBx+n2D8XD4d IvwKYchlmNZyPlYwXzaTmdIlgu3RK7/PcUF8nODszwrYCn9kqtVIZuKzhcabX0gggv279tuK gI39ZO5TMw7MCryTE6qvt0tmKucJr8s85BLiTf/hpn+46T/cgrAVKTS69GSVRhsTpc7UaTKi ElKSHcj/MKWnfx50om/Ne2oQzyFlsLw5SadWSFXpaZnJNUjgsDJEPr5fq1bIE1WZJ0V9yhH9 ca2YVoMWcEQZJl/rO5Go4JNUx8Sjopgq6v9cJVzQ/Gy04eKsZ8tfLtrgFZrcnVvqOwbeL006 JTlvdb4Lb0/QZ+2JuBXcfyh0aHL9srOFFjm2uTp3vEyJPGxT7+Zyis10a/xSQypzdOJt3MfG a9vPG3Ntz64k9Cw81VQ4d2/kZVfDNpMB3Y3eGbUrbDFT7ShZl7PpjDXCG1v49GsbHxdxp26h kqSpVWtWYX2a6jfwrGmKLAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA02Sa0hTcRjG+e/8d87ZaHVcVof6EC0kKroYGe/o5pfqEF0/ZCaFjjq05Zy2 OXVFoGmFI+2yPtQ2ayktm5PJyXKGWWxeqUgm3spbmrFA7KINbUVtRtS3h+f9Pc/75aEJeRgv pjW6bF6vU2kVpBRL920uXHPXlKleL/RsALvHTULVdB7cH/aKwe56jGBq5i0Fk02tJFTcDRFg f12E4ZvnOwFjLSMUVAl7Ycj5AUPDpToCRq60kVBSFCbg6cwEBee9lSLwl7WLoeNxqRhufL9H QF3+MAWdT+wkDLp/ieGDrwRDu/UBhqHSRGhxLITQi3EETZ46EYQul5FgCThIGC0aQhDwj2Cw FZQi8DT2iiE8HemwNQ9SiXGcf/wTwdU+6BNx9dYBinMIRu5h5SrO3BsgOMFVTHLC1+sU19/d QHJtN8OYq/dOiriSwgmS+zL2BnOfGrtIriL4WcR5arvwAXmKdMsJXqvJ4fXrtqVJ1Z4BJ8q6 JMmzOotF+chPmZGEZpmNrC00RkY1yaxge3tniKiOZeLZyZFWbEZSmmCqSbbJ/XY2MJ9JYs3v 3LMQZuLYYEPxrJYxCaztmg3/KV3KVtU8j/g0LWE2sd7Rs1FbHkHCXWb8B49h22+9x1GEiPz1 3JZHbSKSLHxkI64imfU/yvqPsv5HORDhQrEaXU6GSqNNWGtIV5t0mry1xzMzBBSZhPPcj2te NNW5y4cYGinmyDpO6tRysSrHYMrwIZYmFLGy6WStWi47oTKd4fWZqXqjljf40BIaKxbJdh/m 0+TMSVU2n87zWbz+71VESxbnI5eyYG/Rx1JzcvWrNst+e25DyeqpMcncZ8ccO4OerfMupDX5 BUvB+tTtp5aX30nsNC4rm8gN3sqmYvfn4kPLYizBviNrzglnfx6Mq4zZvKOt2zekrCp/GVBe sJCjze6HmoI9xhr3lsa+lPKeixcdH/uPPlqgNDlqVjJJ7+r9X8dPK7BBrYpfRegNqt+p5yiz DgMAAA== X-CFilter-Loop: Reflected To eliminate the use of struct page in page pool, the page pool code should use netmem descriptor and APIs instead. As part of the work, introduce a netmem API to convert a virtual address to a head netmem allowing the code to use it rather than the existing API, virt_to_head_page() for struct page. Signed-off-by: Byungchul Park Reviewed-by: Toke Høiland-Jørgensen Reviewed-by: Pavel Begunkov Reviewed-by: Mina Almasry --- include/net/netmem.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/net/netmem.h b/include/net/netmem.h index 283b4a997fbc..b92c7f15166a 100644 --- a/include/net/netmem.h +++ b/include/net/netmem.h @@ -372,6 +372,13 @@ static inline bool page_pool_page_is_pp(struct page *page) } #endif +static inline netmem_ref virt_to_head_netmem(const void *x) +{ + netmem_ref netmem = virt_to_netmem(x); + + return netmem_compound_head(netmem); +} + /** * __netmem_address - unsafely get pointer to the memory backing @netmem * @netmem: netmem reference to get the pointer for -- 2.17.1