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Commit ff06bd19 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

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: default avatarChuck Lever <chuck.lever@oracle.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 6ea8e711

include/linux/sunrpc/rpc_rdma.h

+35 −0
Original line number Original line Diff line number Diff line
@@ -41,6 +41,7 @@ 
#define _LINUX_SUNRPC_RPC_RDMA_H

#define _LINUX_SUNRPC_RPC_RDMA_H





#include <linux/types.h>

#include <linux/types.h>

#include <linux/bitops.h>





#define RPCRDMA_VERSION		1

#define RPCRDMA_VERSION		1

#define rpcrdma_version		cpu_to_be32(RPCRDMA_VERSION)

#define rpcrdma_version		cpu_to_be32(RPCRDMA_VERSION)
@@ -129,4 +130,38 @@ enum rpcrdma_proc { 
#define rdma_done	cpu_to_be32(RDMA_DONE)

#define rdma_done	cpu_to_be32(RDMA_DONE)

#define rdma_error	cpu_to_be32(RDMA_ERROR)

#define rdma_error	cpu_to_be32(RDMA_ERROR)





/*

 * Private extension to RPC-over-RDMA Version One.

 * Message passed during RDMA-CM connection set-up.

 *

 * Add new fields at the end, and don't permute existing

 * fields.

 */

struct rpcrdma_connect_private {

	__be32			cp_magic;

	u8			cp_version;

	u8			cp_flags;

	u8			cp_send_size;

	u8			cp_recv_size;

} __packed;



#define rpcrdma_cmp_magic	__cpu_to_be32(0xf6ab0e18)



enum {

	RPCRDMA_CMP_VERSION		= 1,

	RPCRDMA_CMP_F_SND_W_INV_OK	= BIT(0),

};



static inline u8

rpcrdma_encode_buffer_size(unsigned int size)

{

	return (size >> 10) - 1;

}



static inline unsigned int

rpcrdma_decode_buffer_size(u8 val)

{

	return ((unsigned int)val + 1) << 10;

}



#endif				/* _LINUX_SUNRPC_RPC_RDMA_H */
 
#endif				/* _LINUX_SUNRPC_RPC_RDMA_H */