Re: [PATCH net-next v3 05/18] net/smc: reserve CHID range for SMC-D virtual device

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On 21.09.23 15:19, Wen Gu wrote:
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@xxxxxxxxxxxxxxxxx>
---
  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);
+}
+
I'm wondering if barrier is needed here.
  #endif



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