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/* Copyright (C) 2014 Timo Dritschler <timo.dritschler@kit.edu>
(Karlsruhe Institute of Technology)
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to the Free Software Foundation, Inc., 51
Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef __KIRO_RDMA_H__
#define __KIRO_RDMA_H__
#include <rdma/rdma_cma.h>
struct kiro_connection_context {
// Information and necessary structurs
uint32_t identifier; // Unique Identifier for this connection (Application Specific)
struct kiro_rdma_mem *cf_mr_recv; // Control-Flow Memory Region Receive
struct kiro_rdma_mem *cf_mr_send; // Control-Flow Memory Region Send
struct kiro_rdma_mem *rdma_mr; // Memory Region for RDMA Operations
struct ibv_mr peer_mr; // RDMA Memory Region Information of the peer
enum {
KIRO_IDLE,
KIRO_MRI_REQUESTED, // Memory Region Information Requested
KIRO_RDMA_ESTABLISHED, // MRI Exchange complete. RDMA is ready
KIRO_RDMA_ACTIVE // RDMA Operation is being performed
} rdma_state;
};
struct kiro_connection {
uint32_t identifier;
struct rdma_cm_id *id;
struct kiro_connection *next;
};
struct kiro_ctrl_msg {
enum {
KIRO_REQ_RDMA, // Requesting RDMA Access to/from the peer
KIRO_ACK_RDMA, // acknowledge RDMA Request and provide Memory Region Information
KIRO_REJ_RDMA // RDMA Request rejected :( (peer_mri will be invalid)
} msg_type;
struct ibv_mr peer_mri;
};
struct kiro_rdma_mem {
void *mem; // Pointer to the beginning of the memory block
struct ibv_mr *mr; // Memory Region associated with the memory
size_t size; // Size in Bytes of the memory block
};
static int kiro_register_rdma_memory (struct ibv_pd *pd, struct ibv_mr **mr, void *mem, size_t mem_size, int access)
{
if(mem_size == 0)
{
printf("Cant allocate memory of size '0'.\n");
return -1;
}
void *mem_handle = mem;
if(!mem_handle)
mem_handle = malloc(mem_size);
if(!mem_handle)
{
printf("Failed to allocate memory [Register Memory].");
return -1;
}
*mr = ibv_reg_mr(pd, mem_handle, mem_size, access);
if(!(*mr))
{
// Memory Registration failed
printf("Failed to register memory region!\n");
free(mem_handle);
return -1;
}
return 0;
}
static struct kiro_rdma_mem* kiro_create_rdma_memory (struct ibv_pd *pd, size_t mem_size, int access)
{
if(mem_size == 0)
{
printf("Cant allocate memory of size '0'.\n");
return NULL;
}
struct kiro_rdma_mem *krm = (struct kiro_rdma_mem *)calloc(1, sizeof(struct kiro_rdma_mem));
if(!krm)
{
printf("Failed to create new KIRO RDMA Memory.\n");
return NULL;
}
if(kiro_register_rdma_memory(pd, &(krm->mr), krm->mem, mem_size, access))
{
free(krm);
return NULL;
}
if(!krm->mem)
krm->mem = krm->mr->addr;
return krm;
}
static void kiro_destroy_rdma_memory (struct kiro_rdma_mem *krm)
{
if(!krm)
return;
if(krm->mr)
ibv_dereg_mr(krm->mr);
if(krm->mem)
free(krm->mem);
free(krm);
krm = NULL;
}
static void kiro_destroy_connection_context (struct kiro_connection_context *ctx)
{
if(!ctx)
return;
if(ctx->cf_mr_recv)
kiro_destroy_rdma_memory(ctx->cf_mr_recv);
if(ctx->cf_mr_send)
kiro_destroy_rdma_memory(ctx->cf_mr_send);
if(ctx->rdma_mr)
kiro_destroy_rdma_memory(ctx->rdma_mr);
free(ctx);
ctx = NULL;
}
#endif //__KIRO_RDMA_H__
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