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-rw-r--r--net/smc/smc_loopback.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h
new file mode 100644
index 0000000000..6dd4292dae
--- /dev/null
+++ b/net/smc/smc_loopback.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Shared Memory Communications Direct over loopback-ism device.
+ *
+ * SMC-D loopback-ism device structure definitions.
+ *
+ * Copyright (c) 2024, Alibaba Inc.
+ *
+ * Author: Wen Gu <guwen@linux.alibaba.com>
+ * Tony Lu <tonylu@linux.alibaba.com>
+ *
+ */
+
+#ifndef _SMC_LOOPBACK_H
+#define _SMC_LOOPBACK_H
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <net/smc.h>
+
+#if IS_ENABLED(CONFIG_SMC_LO)
+#define SMC_LO_MAX_DMBS 5000
+#define SMC_LO_DMBS_HASH_BITS 12
+#define SMC_LO_RESERVED_CHID 0xFFFF
+
+struct smc_lo_dmb_node {
+ struct hlist_node list;
+ u64 token;
+ u32 len;
+ u32 sba_idx;
+ void *cpu_addr;
+ dma_addr_t dma_addr;
+ refcount_t refcnt;
+};
+
+struct smc_lo_dev {
+ struct smcd_dev *smcd;
+ struct device dev;
+ u16 chid;
+ struct smcd_gid local_gid;
+ atomic_t dmb_cnt;
+ rwlock_t dmb_ht_lock;
+ DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
+ DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
+ wait_queue_head_t ldev_release;
+};
+
+int smc_loopback_init(void);
+void smc_loopback_exit(void);
+#else
+static inline int smc_loopback_init(void)
+{
+ return 0;
+}
+
+static inline void smc_loopback_exit(void)
+{
+}
+#endif
+
+#endif /* _SMC_LOOPBACK_H */