linux-kernel - [PATCH net-next 05/18] net/smc: reserve CHID range for SMC-D virtual device

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Message-Id: <1695134522-126655-6-git-send-email-guwen@linux.alibaba.com>
Date:   Tue, 19 Sep 2023 22:41:49 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     kgraul@...ux.ibm.com, wenjia@...ux.ibm.com, jaka@...ux.ibm.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     alibuda@...ux.alibaba.com, tonylu@...ux.alibaba.com,
        guwen@...ux.alibaba.com, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 05/18] net/smc: reserve CHID range for SMC-D virtual device

This patch reserve CHID range from 0xFF00 to 0xFFFF for SMC-D virtual
device and introduces helpers to identify them.

Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
---
 net/smc/smc_ism.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 14d2e77..2ecc8de 100644
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -15,6 +15,9 @@
 
 #include "smc.h"
 
+#define SMC_VIRT_ISM_CHID_MAX		0xFFFF
+#define SMC_VIRT_ISM_CHID_MIN		0xFF00
+
 struct smcd_dev_list {	/* List of SMCD devices */
 	struct list_head list;
 	struct mutex mutex;	/* Protects list of devices */
@@ -57,4 +60,16 @@ static inline int smc_ism_write(struct smcd_dev *smcd, u64 dmb_tok,
 	return rc < 0 ? rc : 0;
 }
 
+static inline bool __smc_ism_is_virtdev(u16 chid)
+{
+	return (chid >= SMC_VIRT_ISM_CHID_MIN && chid <= SMC_VIRT_ISM_CHID_MAX);
+}
+
+static inline bool smc_ism_is_virtdev(struct smcd_dev *smcd)
+{
+	u16 chid = smcd->ops->get_chid(smcd);
+
+	return __smc_ism_is_virtdev(chid);
+}
+
 #endif
-- 
1.8.3.1