rpcrdma: RDMA/CM private message data structure
Introduce data structure used by both client and server to exchange implementation details during RDMA/CM connection establishment. This is an experimental out-of-band exchange between Linux RPC-over-RDMA Version One implementations, replacing the deprecated CCP (see RFC 5666bis). The purpose of this extension is to enable prototyping of features that might be introduced in a subsequent version of RPC-over-RDMA. Suggested by Christoph Hellwig and Devesh Sharma. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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@ -41,6 +41,7 @@
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#define _LINUX_SUNRPC_RPC_RDMA_H
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#include <linux/types.h>
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#include <linux/bitops.h>
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#define RPCRDMA_VERSION 1
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#define rpcrdma_version cpu_to_be32(RPCRDMA_VERSION)
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@ -129,4 +130,38 @@ enum rpcrdma_proc {
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#define rdma_done cpu_to_be32(RDMA_DONE)
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#define rdma_error cpu_to_be32(RDMA_ERROR)
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/*
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* Private extension to RPC-over-RDMA Version One.
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* Message passed during RDMA-CM connection set-up.
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*
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* Add new fields at the end, and don't permute existing
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* fields.
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*/
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struct rpcrdma_connect_private {
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__be32 cp_magic;
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u8 cp_version;
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u8 cp_flags;
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u8 cp_send_size;
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u8 cp_recv_size;
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} __packed;
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#define rpcrdma_cmp_magic __cpu_to_be32(0xf6ab0e18)
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enum {
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RPCRDMA_CMP_VERSION = 1,
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RPCRDMA_CMP_F_SND_W_INV_OK = BIT(0),
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};
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static inline u8
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rpcrdma_encode_buffer_size(unsigned int size)
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{
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return (size >> 10) - 1;
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}
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static inline unsigned int
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rpcrdma_decode_buffer_size(u8 val)
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{
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return ((unsigned int)val + 1) << 10;
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}
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#endif /* _LINUX_SUNRPC_RPC_RDMA_H */
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