From patchwork Tue Dec 19 08:45:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wen Gu X-Patchwork-Id: 13498057 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E266515AED; Tue, 19 Dec 2023 08:46:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R151e4;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=22;SR=0;TI=SMTPD_---0VyqKZvu_1702975551; Received: from localhost(mailfrom:guwen@linux.alibaba.com fp:SMTPD_---0VyqKZvu_1702975551) by smtp.aliyun-inc.com; Tue, 19 Dec 2023 16:45:53 +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, guangguan.wang@linux.alibaba.com, linux-s390@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v7 06/10] net/smc: define a reserved CHID range for virtual ISM devices Date: Tue, 19 Dec 2023 16:45:32 +0800 Message-Id: <20231219084536.8158-7-guwen@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20231219084536.8158-1-guwen@linux.alibaba.com> References: <20231219084536.8158-1-guwen@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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-and-tested-by: Wenjia Zhang 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 832b2f42d79f..d1228a615f23 100644 --- a/net/smc/smc_ism.h +++ b/net/smc/smc_ism.h @@ -15,6 +15,8 @@ #include "smc.h" +#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, u64 dmb_tok, return rc < 0 ? rc : 0; } +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) == 0xFF00); +} + +static inline bool smc_ism_is_virtual(struct smcd_dev *smcd) +{ + u16 chid = smcd->ops->get_chid(smcd); + + return __smc_ism_is_virtual(chid); +} + #endif