Merging upstream version 6.10.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 */