Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

[thirdparty/kernel/linux.git] / net / smc / smc_loopback.h

diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h
new file mode 100644 (file)
index 0000000..6dd4292
--- /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 */