From nobody Wed Dec 17 02:26:05 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30681C4167B for ; Thu, 30 Nov 2023 11:28:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345255AbjK3L2k (ORCPT ); Thu, 30 Nov 2023 06:28:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345167AbjK3L2c (ORCPT ); Thu, 30 Nov 2023 06:28:32 -0500 Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04E421709; Thu, 30 Nov 2023 03:28:34 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046059;MF=guwen@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0VxROoLH_1701343710; Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0VxROoLH_1701343710) by smtp.aliyun-inc.com; Thu, 30 Nov 2023 19:28:32 +0800 From: Wen Gu To: wintera@linux.ibm.com, wenjia@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, kgraul@linux.ibm.com, jaka@linux.ibm.com Cc: borntraeger@linux.ibm.com, svens@linux.ibm.com, alibuda@linux.alibaba.com, tonylu@linux.alibaba.com, guwen@linux.alibaba.com, raspl@linux.ibm.com, schnelle@linux.ibm.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v3 4/7] net/smc: define a reserved CHID range for virtual ISM devices Date: Thu, 30 Nov 2023 19:28:12 +0800 Message-Id: <1701343695-122657-5-git-send-email-guwen@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1701343695-122657-1-git-send-email-guwen@linux.alibaba.com> References: <1701343695-122657-1-git-send-email-guwen@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" According to virtual ISM support feature defined by SMCv2.1, CHIDs in the range 0xFF00 to 0xFFFF are reserved for use by virtual ISM devices. And two helpers are introduced to distinguish virtual ISM devices from the existing platform firmware ISM devices. Signed-off-by: Wen Gu Reviewed-by: Alexandra Winter --- net/smc/smc_ism.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h index 832b2f4..d1228a6 100644 --- a/net/smc/smc_ism.h +++ b/net/smc/smc_ism.h @@ -15,6 +15,8 @@ =20 #include "smc.h" =20 +#define SMC_VIRTUAL_ISM_CHID_MASK 0xFF00 + struct smcd_dev_list { /* List of SMCD devices */ struct list_head list; struct mutex mutex; /* Protects list of devices */ @@ -56,4 +58,22 @@ static inline int smc_ism_write(struct smcd_dev *smcd, u= 64 dmb_tok, return rc < 0 ? rc : 0; } =20 +static inline bool __smc_ism_is_virtual(u16 chid) +{ + /* CHIDs in range of 0xFF00 to 0xFFFF are reserved + * for virtual ISM device. + * + * loopback-ism: 0xFFFF + * virtio-ism: 0xFF00 ~ 0xFFFE + */ + return ((chid & 0xFF00) =3D=3D 0xFF00); +} + +static inline bool smc_ism_is_virtual(struct smcd_dev *smcd) +{ + u16 chid =3D smcd->ops->get_chid(smcd); + + return __smc_ism_is_virtual(chid); +} + #endif --=20 1.8.3.1