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gpu_direct_rdma_access.c
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/*
* Copyright (c) 2019 Mellanox Technologies, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netdb.h>
#include <malloc.h>
#include <getopt.h>
#include <arpa/inet.h>
#include <time.h>
#include <rdma/rdma_cma.h>
#include <infiniband/mlx5dv.h>
#include "khash.h"
#include "ibv_helper.h"
#include "gpu_direct_rdma_access.h"
int debug = 0;
int debug_fast_path = 0;
#define DEBUG_LOG if (debug) printf
#define DEBUG_LOG_FAST_PATH if (debug_fast_path) printf
#define FDEBUG_LOG if (debug) fprintf
#define FDEBUG_LOG_FAST_PATH if (debug_fast_path) fprintf
#define CQ_DEPTH 640
#define SEND_Q_DEPTH 640
#define DC_KEY 0xffeeddcc /*this is defined for both sides: client and server*/
#define COMP_ARRAY_SIZE 16
#define TC_PRIO 3
#define WR_ID_FLUSH_MARKER UINT64_MAX
#define mmin(a, b) a < b ? a : b
KHASH_TYPE(kh_ib_ah, struct ibv_ah_attr, struct ibv_ah*);
enum wr_id_flags {
WR_ID_FLAGS_ACTIVE = 1 << 0
};
struct wr_id_reported {
uint64_t wr_id;
uint16_t num_wrs;
uint16_t flags; /* enum wr_id_flags */
};
#ifdef PRINT_LATENCY
struct wr_latency {
uint64_t wr_start_ts;
uint64_t wr_complete_ts;
uint64_t completion_ts;
uint64_t read_comp_ts;
};
#endif /*PRINT_LATENCY*/
struct rdma_device {
struct rdma_event_channel *cm_channel;
struct rdma_cm_id *cm_id;
struct ibv_context *context;
struct ibv_pd *pd;
#ifdef PRINT_LATENCY
struct ibv_cq_ex *cq;
#else
struct ibv_cq *cq;
#endif
struct ibv_srq *srq; /* for DCT (client) only, for DCI (server) this is NULL */
struct ibv_qp *qp;
struct ibv_qp_ex *qpex; /* DCI (server) only */
struct mlx5dv_qp_ex *mqpex; /* DCI (server) only */
/* Address handler (port info) relateed fields */
int ib_port;
int is_global;
int gidx;
union ibv_gid gid;
uint16_t lid;
enum ibv_mtu mtu;
struct wr_id_reported app_wr_id[SEND_Q_DEPTH];
int app_wr_id_idx;
int qp_available_wr;
int rdma_buff_cnt;
/* AH hash */
khash_t(kh_ib_ah) ah_hash;
#ifdef PRINT_LATENCY
uint64_t hca_core_clock_kHz;
struct wr_latency latency[SEND_Q_DEPTH];
uint64_t measure_index;
uint64_t wr_complete_latency_sum; /*from wr_start_ts*/
uint64_t completion_latency_sum; /*from wr_start_ts*/
uint64_t read_comp_latency_sum; /*from completion_ts*/
uint64_t min_wr_complete_latency;
uint64_t min_completion_latency;
uint64_t min_read_comp_latency;
uint64_t max_wr_complete_latency;
uint64_t max_completion_latency;
uint64_t max_read_comp_latency;
#endif /*PRINT_LATENCY*/
};
struct rdma_buffer {
/* Buffer Related fields */
void *buf_addr; //uint64_t addr;
size_t buf_size; //uint32_t size;
/* MR Related fields */
struct ibv_mr *mr;
uint32_t rkey;
/* Linked rdma_device */
struct rdma_device *rdma_dev;
};
struct rdma_exec_params {
struct rdma_device *device;
uint64_t wr_id;
unsigned long rem_buf_rkey;
unsigned long long rem_buf_addr;
uint32_t rem_buf_size;
struct ibv_ah *ah;
unsigned long rem_dctn; /*QP number from DCT (client)*/
uint32_t local_buf_mr_lkey;
void *local_buf_addr;
struct iovec *local_buf_iovec;
int local_buf_iovcnt;
uint32_t flags; /*enum rdma_task_attr_flags*/
};
static inline
int is_server(struct rdma_device *device)
{
return device->srq == NULL;
}
/* use both gid + lid data for key generarion (lid - ib based, gid - RoCE) */
static inline
khint32_t kh_ib_ah_hash_func(struct ibv_ah_attr attr)
{
return kh_int64_hash_func(attr.grh.dgid.global.subnet_prefix ^
attr.grh.dgid.global.interface_id ^
attr.dlid);
}
static inline
int kh_ib_ah_hash_equal(struct ibv_ah_attr a, struct ibv_ah_attr b)
{
return !memcmp(&a, &b, sizeof(a));
}
KHASH_IMPL(kh_ib_ah, struct ibv_ah_attr, struct ibv_ah*, 1,
kh_ib_ah_hash_func, kh_ib_ah_hash_equal)
//============================================================================================
static struct ibv_context *open_ib_device_by_name(const char *ib_dev_name)
{
struct ibv_device **dev_list;
struct ibv_device *ib_dev;
struct ibv_context *context = NULL;
/****************************************************************************************************
* In the next block we are checking if given IB device name matches one of devices in the list.
* The result of this block is ig_dev - initialized pointer to the relevant struct ibv_device
****************************************************************************************************/
dev_list = ibv_get_device_list(NULL);
if (!dev_list) {
perror("Failed to get IB devices list");
return NULL;
}
DEBUG_LOG ("Given device name \"%s\"\n", ib_dev_name);
int i;
for (i = 0; dev_list[i]; ++i) {
char *dev_name_from_list = (char*)ibv_get_device_name(dev_list[i]);
DEBUG_LOG ("Device %d name \"%s\"\n", i, dev_name_from_list);
if (!strcmp(dev_name_from_list, ib_dev_name)) /*if found*/
break;
}
ib_dev = dev_list[i];
if (!ib_dev) {
fprintf(stderr, "IB device %s not found\n", ib_dev_name);
goto clean_device_list;
}
/****************************************************************************************************/
DEBUG_LOG ("ibv_open_device(ib_dev = %p)\n", ib_dev);
context = ibv_open_device(ib_dev);
if (!context) {
fprintf(stderr, "Couldn't get context for %s\n", ib_dev_name);
goto clean_device_list;
}
DEBUG_LOG("created ib context %p\n", context);
/* We are now done with device list, we can free it */
clean_device_list:
ibv_free_device_list(dev_list); /*dev_list is not NULL*/
return context;
}
//============================================================================================
static struct ibv_context *open_ib_device_by_addr(struct rdma_device *rdma_dev, struct sockaddr *addr)
{
int ret;
uint16_t sin_port;
char str[INET_ADDRSTRLEN];
rdma_dev->cm_channel = rdma_create_event_channel();
if (!rdma_dev->cm_channel) {
DEBUG_LOG("rdma_create_event_channel() failure");
return NULL;
}
ret = rdma_create_id(rdma_dev->cm_channel, &rdma_dev->cm_id, rdma_dev, RDMA_PS_UDP);
//printf("rdma_create returned: %d\n", ret);
if (ret) {
DEBUG_LOG("rdma_create_id() failure");
goto out1;
}
ret = rdma_bind_addr(rdma_dev->cm_id, addr);
if (ret) {
DEBUG_LOG("rdma_bind_addr() failure");
goto out2;
}
if (addr->sa_family == AF_INET) {
sin_port = ((struct sockaddr_in *)addr)->sin_port;
inet_ntop(AF_INET, &(((struct sockaddr_in *)addr)->sin_addr), str, INET_ADDRSTRLEN);
}
else {
sin_port = ((struct sockaddr_in6 *)addr)->sin6_port;
inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)addr)->sin6_addr), str, INET_ADDRSTRLEN);
}
if (rdma_dev->cm_id->verbs == NULL) {
DEBUG_LOG("Failed to bind to an RDMA device, exiting... <%s, %d>\n", str, ntohs(sin_port));
goto out2;
}
rdma_dev->ib_port = rdma_dev->cm_id->port_num;
rdma_dev->gidx = -1;
DEBUG_LOG("bound to RDMA device name:%s, port:%d, based on '%s'\n",
rdma_dev->cm_id->verbs->device->name, rdma_dev->cm_id->port_num, str);
return rdma_dev->cm_id->verbs;
out2:
rdma_destroy_id(rdma_dev->cm_id);
out1:
rdma_destroy_event_channel(rdma_dev->cm_channel);
return NULL;
}
static void close_ib_device(struct rdma_device *rdma_dev)
{
int ret;
if (rdma_dev->cm_channel) {
/* if we are using RDMA_CM then we just referance the cma's ibv_context */
rdma_dev->context = NULL;
if (rdma_dev->cm_id) {
DEBUG_LOG("rdma_destroy_id(%p)\n", rdma_dev->cm_id);
ret = rdma_destroy_id(rdma_dev->cm_id);
if (ret) {
fprintf(stderr, "failure in rdma_destroy_id(), error %d\n", ret);
}
}
DEBUG_LOG("rdma_destroy_event_channel(%p)\n", rdma_dev->cm_id);
rdma_destroy_event_channel(rdma_dev->cm_channel);
}
if (rdma_dev->context) {
DEBUG_LOG("ibv_close_device(%p)\n", rdma_dev->context);
ret = ibv_close_device(rdma_dev->context);
if (ret) {
fprintf(stderr, "failure in ibv_close_device(), error %d\n", ret);
}
}
}
/***********************************************************************************
* Fill portinfo structure, get lid and gid from portinfo
* Return value: 0 - success, 1 - error
****************************************************************************************/
static int rdma_set_lid_gid_from_port_info(struct rdma_device *rdma_dev)
{
struct ibv_port_attr portinfo;
int ret_val;
ret_val = ibv_query_port(rdma_dev->context, rdma_dev->ib_port, &portinfo);
if (ret_val) {
fprintf(stderr, "Couldn't get port info\n");
return 1;
}
rdma_dev->mtu = portinfo.active_mtu;
rdma_dev->lid = portinfo.lid;
if ((portinfo.link_layer != IBV_LINK_LAYER_ETHERNET) && (!portinfo.lid)) {
fprintf(stderr, "Couldn't get local LID\n");
return 1;
}
if (rdma_dev->cm_id && portinfo.link_layer == IBV_LINK_LAYER_ETHERNET) {
rdma_dev->gidx = ibv_find_sgid_type(rdma_dev->context, rdma_dev->ib_port,
IBV_GID_TYPE_ROCE_V2, rdma_dev->cm_id->route.addr.src_addr.sa_family);
}
if (rdma_dev->gidx < 0) {
if (portinfo.link_layer == IBV_LINK_LAYER_ETHERNET) {
fprintf(stderr, "Wrong GID index (%d) for ETHERNET port\n", rdma_dev->gidx);
return 1;
} else {
memset(&(rdma_dev->gid), 0, sizeof rdma_dev->gid);
}
} else /* rdma_dev->gidx >= 0*/ {
ret_val = ibv_query_gid(rdma_dev->context, rdma_dev->ib_port, rdma_dev->gidx, &(rdma_dev->gid));
if (ret_val) {
fprintf(stderr, "can't read GID of index %d, error code %d\n", rdma_dev->gidx, ret_val);
return 1;
}
DEBUG_LOG ("my gid idx: %d, value:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x\n", rdma_dev->gidx,
rdma_dev->gid.raw[0], rdma_dev->gid.raw[1], rdma_dev->gid.raw[2], rdma_dev->gid.raw[3],
rdma_dev->gid.raw[4], rdma_dev->gid.raw[5], rdma_dev->gid.raw[6], rdma_dev->gid.raw[7],
rdma_dev->gid.raw[8], rdma_dev->gid.raw[9], rdma_dev->gid.raw[10], rdma_dev->gid.raw[11],
rdma_dev->gid.raw[12], rdma_dev->gid.raw[13], rdma_dev->gid.raw[14], rdma_dev->gid.raw[15] );
}
rdma_dev->is_global = (rdma_dev->gid.global.interface_id != 0);
DEBUG_LOG ("link_layer:%s, lid:%d, is_global:%d, MTU:%d Bytes\n",
(portinfo.link_layer == IBV_LINK_LAYER_ETHERNET ? "ETH" : "IB"),
rdma_dev->lid, rdma_dev->is_global, (256<<(rdma_dev->mtu - 1)));
return 0;
}
/****************************************************************************************
* Modify target QP state to RTR (on the client side)
* Return value: 0 - success, 1 - error
****************************************************************************************/
static int modify_target_qp_to_rtr(struct rdma_device *rdma_dev)
{
struct ibv_qp_attr qp_attr;
enum ibv_qp_attr_mask attr_mask;
memset(&qp_attr, 0, sizeof qp_attr);
qp_attr.qp_state = IBV_QPS_RTR;
qp_attr.path_mtu = rdma_dev->mtu;
qp_attr.min_rnr_timer = 16;
qp_attr.ah_attr.port_num = rdma_dev->ib_port;
if (rdma_dev->gid.global.interface_id) {
qp_attr.ah_attr.is_global = 1;
qp_attr.ah_attr.grh.hop_limit = 1;
qp_attr.ah_attr.grh.sgid_index = rdma_dev->gidx;
qp_attr.ah_attr.grh.traffic_class = TC_PRIO << 5; // <<3 for dscp2prio, <<2 for ECN bits
}
attr_mask = IBV_QP_STATE |
IBV_QP_AV |
IBV_QP_PATH_MTU |
IBV_QP_MIN_RNR_TIMER; // for DCT
DEBUG_LOG("ibv_modify_qp(qp = %p, qp_attr.qp_state = %d, attr_mask = 0x%x)\n",
rdma_dev->qp, qp_attr.qp_state, attr_mask);
if (ibv_modify_qp(rdma_dev->qp, &qp_attr, attr_mask)) {
fprintf(stderr, "Failed to modify QP to RTR\n");
return 1;
}
DEBUG_LOG ("ibv_modify_qp to state %d completed: qp_num = 0x%x\n", qp_attr.qp_state, rdma_dev->qp->qp_num);
return 0;
}
/****************************************************************************************
* Modify source QP state to RTR and then to RTS (on the server side)
* Return value: 0 - success, 1 - error
****************************************************************************************/
static int modify_source_qp_to_rtr_and_rts(struct rdma_device *rdma_dev)
{
struct ibv_qp_attr qp_attr;
enum ibv_qp_attr_mask attr_mask;
memset(&qp_attr, 0, sizeof qp_attr);
/* - - - - - - - Modify QP to RTR - - - - - - - */
qp_attr.qp_state = IBV_QPS_RTR;
qp_attr.path_mtu = rdma_dev->mtu;
qp_attr.ah_attr.port_num = rdma_dev->ib_port;
if (rdma_dev->gid.global.interface_id) {
qp_attr.ah_attr.is_global = 1;
qp_attr.ah_attr.grh.hop_limit = 1;
qp_attr.ah_attr.grh.sgid_index = rdma_dev->gidx;
qp_attr.ah_attr.grh.traffic_class = TC_PRIO << 5; // <<3 for dscp2prio, <<2 for ECN bits
}
attr_mask = IBV_QP_STATE |
IBV_QP_AV |
IBV_QP_PATH_MTU ;
DEBUG_LOG("ibv_modify_qp(qp = %p, qp_attr.qp_state = %d, attr_mask = 0x%x)\n",
rdma_dev->qp, qp_attr.qp_state, attr_mask);
if (ibv_modify_qp(rdma_dev->qp, &qp_attr, attr_mask)) {
fprintf(stderr, "Failed to modify QP to RTR\n");
return 1;
}
DEBUG_LOG ("ibv_modify_qp to state %d completed: qp_num = 0x%x\n", qp_attr.qp_state, rdma_dev->qp->qp_num);
/* - - - - - - - Modify QP to RTS - - - - - - - */
qp_attr.qp_state = IBV_QPS_RTS;
qp_attr.timeout = 16;
qp_attr.retry_cnt = 7;
qp_attr.rnr_retry = 7;
//qp_attr.sq_psn = 0;
qp_attr.max_rd_atomic = 1;
attr_mask = IBV_QP_STATE |
IBV_QP_TIMEOUT |
IBV_QP_RETRY_CNT |
IBV_QP_RNR_RETRY |
IBV_QP_SQ_PSN |
IBV_QP_MAX_QP_RD_ATOMIC ;
DEBUG_LOG("ibv_modify_qp(qp = %p, qp_attr.qp_state = %d, attr_mask = 0x%x)\n",
rdma_dev->qp, qp_attr.qp_state, attr_mask);
if (ibv_modify_qp(rdma_dev->qp, &qp_attr, attr_mask)) {
fprintf(stderr, "Failed to modify QP to RTS\n");
return 1;
}
DEBUG_LOG ("ibv_modify_qp to state %d completed: qp_num = 0x%x\n", qp_attr.qp_state, rdma_dev->qp->qp_num);
return 0;
}
static int destroy_qp(struct ibv_qp *qp)
{
int ret;
if (qp) {
DEBUG_LOG("ibv_destroy_qp(%p)\n", qp);
ret = ibv_destroy_qp(qp);
if (ret) {
fprintf(stderr, "Couldn't destroy QP: error %d\n", ret);
}
}
return ret;
}
static int modify_source_qp_rst2rts(struct rdma_device *rdma_dev)
{
int ret_val;
/* - - - - - - - - - - Modify QP to INIT - - - - - - - - - - - - - */
struct ibv_qp_attr qp_attr = {
.qp_state = IBV_QPS_INIT,
.pkey_index = 0,
.port_num = rdma_dev->ib_port,
.qp_access_flags = IBV_ACCESS_LOCAL_WRITE
};
enum ibv_qp_attr_mask attr_mask = IBV_QP_STATE |
IBV_QP_PKEY_INDEX |
IBV_QP_PORT |
0 /*IBV_QP_ACCESS_FLAGS*/; /*we must zero this bit for DCI QP*/
DEBUG_LOG("ibv_modify_qp(qp = %p, qp_attr.qp_state = %d, attr_mask = 0x%x)\n",
rdma_dev->qp, qp_attr.qp_state, attr_mask);
ret_val = ibv_modify_qp(rdma_dev->qp, &qp_attr, attr_mask);
if (ret_val) {
fprintf(stderr, "Failed to modify QP to INIT, error %d\n", ret_val);
return 1;
}
DEBUG_LOG("ibv_modify_qp to state %d completed: qp_num = 0x%x\n", qp_attr.qp_state, rdma_dev->qp->qp_num);
/* - - - - - - - - - - - - - Modify QP to RTS - - - - - - - - - - - - */
ret_val = modify_source_qp_to_rtr_and_rts(rdma_dev);
if (ret_val) {
return 1;
}
rdma_dev->qpex->wr_flags = IBV_SEND_SIGNALED;
return 0;
}
//============================================================================================
struct rdma_device *rdma_open_device_client(struct sockaddr *addr)
{
struct rdma_device *rdma_dev;
int ret_val;
rdma_dev = calloc(1, sizeof *rdma_dev);
if (!rdma_dev) {
fprintf(stderr, "rdma_device memory allocation failed\n");
return NULL;
}
/****************************************************************************************************
* In the next function we let rdma_cm find a IB device that matches the IP address of a the local netdev,
* if yes, we return a pointer to that ib context
* The result of this function is ib_dev - initialized pointer to the relevant struct ibv_device
****************************************************************************************************/
rdma_dev->context = open_ib_device_by_addr(rdma_dev, addr);
if (!rdma_dev->context){
goto clean_rdma_dev;
}
ret_val = rdma_set_lid_gid_from_port_info(rdma_dev);
if (ret_val) {
goto clean_device;
}
/****************************************************************************************************/
DEBUG_LOG ("ibv_alloc_pd(ibv_context = %p)\n", rdma_dev->context);
rdma_dev->pd = ibv_alloc_pd(rdma_dev->context);
if (!rdma_dev->pd) {
fprintf(stderr, "Couldn't allocate PD\n");
goto clean_device;
}
DEBUG_LOG("created pd %p\n", rdma_dev->pd);
/* ********************************** Create CQ ********************************** */
#ifdef PRINT_LATENCY
struct ibv_cq_init_attr_ex cq_attr_ex;
memset(&cq_attr_ex, 0, sizeof(cq_attr_ex));
cq_attr_ex.cqe = CQ_DEPTH;
cq_attr_ex.cq_context = rdma_dev;
cq_attr_ex.channel = NULL;
cq_attr_ex.comp_vector = 0;
cq_attr_ex.wc_flags = IBV_WC_EX_WITH_COMPLETION_TIMESTAMP;
DEBUG_LOG ("ibv_create_cq_ex(rdma_dev->context = %p, &cq_attr_ex)\n", rdma_dev->context);
rdma_dev->cq = ibv_create_cq_ex(rdma_dev->context, &cq_attr_ex);
#else /*PRINT_LATENCY*/
DEBUG_LOG ("ibv_create_cq(%p, %d, NULL, NULL, 0)\n", rdma_dev->context, CQ_DEPTH);
rdma_dev->cq = ibv_create_cq(rdma_dev->context, CQ_DEPTH, NULL, NULL /*comp. events channel*/, 0);
#endif /*PRINT_LATENCY*/
if (!rdma_dev->cq) {
fprintf(stderr, "Couldn't create CQ\n");
goto clean_pd;
}
DEBUG_LOG("created cq %p\n", rdma_dev->cq);
/* ********************************** Create SRQ ********************************** */
struct ibv_srq_init_attr srq_attr;
memset(&srq_attr, 0, sizeof(srq_attr));
srq_attr.attr.max_wr = 2;
srq_attr.attr.max_sge = 1;
DEBUG_LOG ("ibv_create_srq(%p, %d, NULL, NULL, 0)\n", rdma_dev->context, CQ_DEPTH);
rdma_dev->srq = ibv_create_srq(rdma_dev->pd, &srq_attr);
if (!rdma_dev->srq) {
fprintf(stderr, "ibv_create_srq failed\n");
goto clean_cq;
}
DEBUG_LOG("created srq %p\n", rdma_dev->srq);
/* ********************************** Create QP ********************************** */
struct ibv_qp_init_attr_ex attr_ex;
struct mlx5dv_qp_init_attr attr_dv;
memset(&attr_ex, 0, sizeof(attr_ex));
memset(&attr_dv, 0, sizeof(attr_dv));
attr_ex.qp_type = IBV_QPT_DRIVER;
#ifdef PRINT_LATENCY
attr_ex.send_cq = ibv_cq_ex_to_cq(rdma_dev->cq);
attr_ex.recv_cq = ibv_cq_ex_to_cq(rdma_dev->cq);
#else /*PRINT_LATENCY*/
attr_ex.send_cq = rdma_dev->cq;
attr_ex.recv_cq = rdma_dev->cq;
#endif /*PRINT_LATENCY*/
attr_ex.comp_mask |= IBV_QP_INIT_ATTR_PD;
attr_ex.pd = rdma_dev->pd;
attr_ex.srq = rdma_dev->srq; /* Should use SRQ for client only (DCT) */
/* create DCT */
attr_dv.comp_mask |= MLX5DV_QP_INIT_ATTR_MASK_DC;
attr_dv.dc_init_attr.dc_type = MLX5DV_DCTYPE_DCT;
attr_dv.dc_init_attr.dct_access_key = DC_KEY;
DEBUG_LOG ("mlx5dv_create_qp(%p)\n", rdma_dev->context);
rdma_dev->qp = mlx5dv_create_qp(rdma_dev->context, &attr_ex, &attr_dv);
if (!rdma_dev->qp) {
fprintf(stderr, "Couldn't create QP\n");
goto clean_srq;
}
DEBUG_LOG ("mlx5dv_create_qp %p completed: qp_num = 0x%x\n", rdma_dev->qp, rdma_dev->qp->qp_num);
/* - - - - - - - Modify QP to INIT - - - - - - - */
struct ibv_qp_attr qp_attr = {
.qp_state = IBV_QPS_INIT,
.pkey_index = 0,
.port_num = rdma_dev->ib_port,
.qp_access_flags = IBV_ACCESS_REMOTE_READ | IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE
};
enum ibv_qp_attr_mask attr_mask = IBV_QP_STATE |
IBV_QP_PKEY_INDEX |
IBV_QP_PORT |
IBV_QP_ACCESS_FLAGS;
DEBUG_LOG ("ibv_modify_qp(qp = %p, qp_attr.qp_state = %d, attr_mask = 0x%x)\n",
rdma_dev->qp, qp_attr.qp_state, attr_mask);
ret_val = ibv_modify_qp(rdma_dev->qp, &qp_attr, attr_mask);
if (ret_val) {
fprintf(stderr, "Failed to modify QP to INIT, error %d\n", ret_val);
goto clean_qp;
}
DEBUG_LOG ("ibv_modify_qp to state %d completed: qp_num = 0x%x\n", qp_attr.qp_state, rdma_dev->qp->qp_num);
ret_val = modify_target_qp_to_rtr(rdma_dev);
if (ret_val) {
goto clean_qp;
}
DEBUG_LOG("init AH cache\n");
kh_init_inplace(kh_ib_ah, &rdma_dev->ah_hash);
#ifdef PRINT_LATENCY
struct ibv_device_attr_ex device_attr_ex = {};
//struct ibv_query_device_ex_input query_device_ex_input = {
// .comp_masc = ...
//}
ret_val = ibv_query_device_ex(rdma_dev->context, /*struct ibv_query_device_ex_input*/NULL, &device_attr_ex);
if (ret_val) {
fprintf(stderr, "ibv_query_device_ex failed\n");
goto clean_qp;
}
if (!device_attr_ex.hca_core_clock) {
fprintf(stderr, "hca_core_clock = 0\n");
goto clean_qp;
}
rdma_dev->hca_core_clock_kHz = device_attr_ex.hca_core_clock;
DEBUG_LOG("hca_core_clock = %d kHz\n", rdma_dev->hca_core_clock_kHz);
#endif /*PRINT_LATENCY*/
return rdma_dev;
clean_qp:
destroy_qp(rdma_dev->qp);
clean_srq:
if (rdma_dev->srq) {
ibv_destroy_srq(rdma_dev->srq);
}
clean_cq:
if (rdma_dev->cq) {
#ifdef PRINT_LATENCY
ibv_destroy_cq(ibv_cq_ex_to_cq(rdma_dev->cq));
#else /*PRINT_LATENCY*/
ibv_destroy_cq(rdma_dev->cq);
#endif /*PRINT_LATENCY*/
}
clean_pd:
if (rdma_dev->pd) {
ibv_dealloc_pd(rdma_dev->pd);
}
clean_device:
close_ib_device(rdma_dev);
clean_rdma_dev:
free(rdma_dev);
return NULL;
}
//============================================================================================
struct rdma_device *rdma_open_device_server(struct sockaddr *addr)
{
struct rdma_device *rdma_dev;
int ret_val;
rdma_dev = calloc(1, sizeof *rdma_dev);
if (!rdma_dev) {
fprintf(stderr, "rdma_device memory allocation failed\n");
return NULL;
}
/****************************************************************************************************
* In the next function we let rdma_cm find a IB device that matches the IP address of a the local netdev,
* if yes, we return a pointer to that ib context
* The result of this function is ib_dev - initialized pointer to the relevant struct ibv_device
****************************************************************************************************/
rdma_dev->context = open_ib_device_by_addr(rdma_dev, addr);
if (!rdma_dev->context){
goto clean_rdma_dev;
}
ret_val = rdma_set_lid_gid_from_port_info(rdma_dev);
if (ret_val) {
goto clean_device;
}
/****************************************************************************************************/
DEBUG_LOG ("ibv_alloc_pd(ibv_context = %p)\n", rdma_dev->context);
rdma_dev->pd = ibv_alloc_pd(rdma_dev->context);
if (!rdma_dev->pd) {
fprintf(stderr, "Couldn't allocate PD\n");
goto clean_device;
}
DEBUG_LOG("created pd %p\n", rdma_dev->pd);
/* We don't create completion events channel (ibv_create_comp_channel), we prefer working in polling mode */
/* ********************************** Create CQ ********************************** */
#ifdef PRINT_LATENCY
struct ibv_cq_init_attr_ex cq_attr_ex;
memset(&cq_attr_ex, 0, sizeof(cq_attr_ex));
cq_attr_ex.cqe = CQ_DEPTH;
cq_attr_ex.cq_context = rdma_dev;
cq_attr_ex.channel = NULL;
cq_attr_ex.comp_vector = 0;
cq_attr_ex.wc_flags = IBV_WC_EX_WITH_COMPLETION_TIMESTAMP;
DEBUG_LOG ("ibv_create_cq_ex(rdma_dev->context = %p, &cq_attr_ex)\n", rdma_dev->context);
rdma_dev->cq = ibv_create_cq_ex(rdma_dev->context, &cq_attr_ex);
#else /*PRINT_LATENCY*/
DEBUG_LOG ("ibv_create_cq(%p, %d, NULL, NULL, 0)\n", rdma_dev->context, CQ_DEPTH);
rdma_dev->cq = ibv_create_cq(rdma_dev->context, CQ_DEPTH, NULL, NULL /*comp. events channel*/, 0);
#endif /*PRINT_LATENCY*/
if (!rdma_dev->cq) {
fprintf(stderr, "Couldn't create CQ\n");
goto clean_pd;
}
DEBUG_LOG("created cq %p\n", rdma_dev->cq);
/* We don't create SRQ for DCI (server) side */
/* ********************************** Create QP ********************************** */
struct ibv_qp_init_attr_ex attr_ex;
struct mlx5dv_qp_init_attr attr_dv;
memset(&attr_ex, 0, sizeof(attr_ex));
memset(&attr_dv, 0, sizeof(attr_dv));
attr_ex.qp_type = IBV_QPT_DRIVER;
#ifdef PRINT_LATENCY
attr_ex.send_cq = ibv_cq_ex_to_cq(rdma_dev->cq);
attr_ex.recv_cq = ibv_cq_ex_to_cq(rdma_dev->cq);
#else /*PRINT_LATENCY*/
attr_ex.send_cq = rdma_dev->cq;
attr_ex.recv_cq = rdma_dev->cq;
#endif /*PRINT_LATENCY*/
attr_ex.comp_mask |= IBV_QP_INIT_ATTR_PD;
attr_ex.pd = rdma_dev->pd;
/* create DCI */
attr_dv.comp_mask |= MLX5DV_QP_INIT_ATTR_MASK_DC;
attr_dv.dc_init_attr.dc_type = MLX5DV_DCTYPE_DCI;
attr_ex.cap.max_send_wr = SEND_Q_DEPTH;
attr_ex.cap.max_send_sge = MAX_SEND_SGE;
rdma_dev->qp_available_wr = SEND_Q_DEPTH;
attr_ex.comp_mask |= IBV_QP_INIT_ATTR_SEND_OPS_FLAGS;
attr_ex.send_ops_flags = IBV_QP_EX_WITH_RDMA_WRITE | IBV_QP_EX_WITH_RDMA_READ;
attr_dv.comp_mask |= MLX5DV_QP_INIT_ATTR_MASK_QP_CREATE_FLAGS;
attr_dv.create_flags |= MLX5DV_QP_CREATE_DISABLE_SCATTER_TO_CQE; /*driver doesnt support scatter2cqe data-path on DCI yet*/
DEBUG_LOG ("mlx5dv_create_qp(%p)\n", rdma_dev->context);
rdma_dev->qp = mlx5dv_create_qp(rdma_dev->context, &attr_ex, &attr_dv);
DEBUG_LOG ("mlx5dv_create_qp %p completed: qp_num = 0x%x\n", rdma_dev->qp, rdma_dev->qp->qp_num);
if (!rdma_dev->qp) {
fprintf(stderr, "Couldn't create QP\n");
goto clean_cq;
}
rdma_dev->qpex = ibv_qp_to_qp_ex(rdma_dev->qp);
if (!rdma_dev->qpex) {
fprintf(stderr, "Couldn't create QPEX\n");
goto clean_qp;
}
rdma_dev->mqpex = mlx5dv_qp_ex_from_ibv_qp_ex(rdma_dev->qpex);
if (!rdma_dev->mqpex) {
fprintf(stderr, "Couldn't create MQPEX\n");
goto clean_qp;
}
ret_val = modify_source_qp_rst2rts(rdma_dev);
if (ret_val) {
goto clean_qp;
}
DEBUG_LOG("init AH cache\n");
kh_init_inplace(kh_ib_ah, &rdma_dev->ah_hash);
#ifdef PRINT_LATENCY
struct ibv_device_attr_ex device_attr_ex = {};
//struct ibv_query_device_ex_input query_device_ex_input = {
// .comp_masc = ...
//}
ret_val = ibv_query_device_ex(rdma_dev->context, /*struct ibv_query_device_ex_input*/NULL, &device_attr_ex);
if (ret_val) {
fprintf(stderr, "ibv_query_device_ex failed\n");
goto clean_qp;
}
if (!device_attr_ex.hca_core_clock) {
fprintf(stderr, "hca_core_clock = 0\n");
goto clean_qp;
}
rdma_dev->hca_core_clock_kHz = device_attr_ex.hca_core_clock;
DEBUG_LOG("hca_core_clock = %d kHz\n", rdma_dev->hca_core_clock_kHz);
rdma_dev->min_wr_complete_latency = 0x8FFFFFFFFFFFFFFF;
rdma_dev->min_completion_latency = 0x8FFFFFFFFFFFFFFF;
rdma_dev->min_read_comp_latency = 0x8FFFFFFFFFFFFFFF;
#endif /*PRINT_LATENCY*/
return rdma_dev;
clean_qp:
destroy_qp(rdma_dev->qp);
clean_cq:
if (rdma_dev->cq) {
#ifdef PRINT_LATENCY
ibv_destroy_cq(ibv_cq_ex_to_cq(rdma_dev->cq));
#else /*PRINT_LATENCY*/
ibv_destroy_cq(rdma_dev->cq);
#endif /*PRINT_LATENCY*/
}
clean_pd:
if (rdma_dev->pd) {
ibv_dealloc_pd(rdma_dev->pd);
}
clean_device:
close_ib_device(rdma_dev);
clean_rdma_dev:
free(rdma_dev);
return NULL;
}
//===========================================================================================
static
int rdma_exec_task(struct rdma_exec_params *exec_params)
{
int ret_val;
int required_wr = (exec_params->local_buf_iovcnt) ? (exec_params->local_buf_iovcnt + MAX_SEND_SGE - 1) / MAX_SEND_SGE : 1;
if (required_wr > exec_params->device->qp_available_wr) {
fprintf(stderr, "Required WR number %d is greater than available in QP WRs %d\n",
required_wr, exec_params->device->qp_available_wr);
return 1;
}
void (*ibv_wr_rdma_rw_post)(struct ibv_qp_ex *qp, uint32_t rkey, uint64_t remote_addr) = (exec_params->flags & RDMA_TASK_ATTR_RDMA_READ)
? ibv_wr_rdma_read // client wants to send data to the server
: ibv_wr_rdma_write; // client wants to receive data from the server
/* RDMA Read/Write for DCI connect, this will create cqe->ts_start */
DEBUG_LOG_FAST_PATH("RDMA Read/Write: ibv_wr_start: qpex = %p\n", exec_params->device->qpex);
ibv_wr_start(exec_params->device->qpex);
#ifdef PRINT_LATENCY
struct ibv_values_ex ts_values = {
.comp_mask = IBV_VALUES_MASK_RAW_CLOCK,
.raw_clock = {} /*struct timespec*/
};
ret_val = ibv_query_rt_values_ex(exec_params->device->context, &ts_values);
if (ret_val) {
fprintf(stderr, "ibv_query_rt_values_ex failed after ibv_wr_start call\n");
return 1;
}
#endif /*PRINT_LATENCY*/
// The following code should be atomic operation
int wr_id_idx = exec_params->device->app_wr_id_idx++;
if (exec_params->device->app_wr_id_idx >= SEND_Q_DEPTH) {
exec_params->device->app_wr_id_idx = 0;
}
// end of atomic operation
#ifdef PRINT_LATENCY
exec_params->device->latency[wr_id_idx].wr_start_ts = ts_values.raw_clock.tv_nsec; /*the value in hca clocks*/
#endif /*PRINT_LATENCY*/
// update internal wr_id DB
exec_params->device->qp_available_wr -= required_wr;
exec_params->device->app_wr_id[wr_id_idx].num_wrs = required_wr;
exec_params->device->app_wr_id[wr_id_idx].wr_id = exec_params->wr_id;
exec_params->device->app_wr_id[wr_id_idx].flags = WR_ID_FLAGS_ACTIVE;
exec_params->device->qpex->wr_id = (uint64_t)wr_id_idx;
if (exec_params->local_buf_iovcnt) {
int i, start_i = 0;
struct ibv_sge sg_list[MAX_SEND_SGE];
uint64_t curr_rem_addr = (uint64_t)exec_params->rem_buf_addr;
int num_sges_to_send = exec_params->local_buf_iovcnt;
while (num_sges_to_send > 0) {
int curr_iovcnt = mmin(MAX_SEND_SGE, num_sges_to_send);
exec_params->device->qpex->wr_flags = num_sges_to_send > MAX_SEND_SGE ? 0 : IBV_SEND_SIGNALED;
DEBUG_LOG_FAST_PATH("RDMA Read/Write: ibv_wr_rdma_%s: wr_id=0x%llx, qpex=%p, rkey=0x%lx, remote_buf=0x%llx\n",
exec_params->flags & RDMA_TASK_ATTR_RDMA_READ ? "read" : "write",
(long long unsigned int)exec_params->wr_id, exec_params->device->qpex, exec_params->rem_buf_rkey, (long long unsigned int)curr_rem_addr);
ibv_wr_rdma_rw_post(exec_params->device->qpex, exec_params->rem_buf_rkey, curr_rem_addr);
for (i = 0; i < curr_iovcnt; i++) {
sg_list[i].addr = (uint64_t)exec_params->local_buf_iovec[start_i + i].iov_base;
sg_list[i].length = (uint32_t)exec_params->local_buf_iovec[start_i + i].iov_len;
sg_list[i].lkey = exec_params->local_buf_mr_lkey;
curr_rem_addr += sg_list[i].length;
}
DEBUG_LOG_FAST_PATH("RDMA Read/Write: ibv_wr_set_sge_list(qpex=%p, num_sge=%lu, sg_list=%p), start_i=%d, num_sges_to_send=%d, sg[0].length=%u\n",
exec_params->device->qpex, (size_t)curr_iovcnt, (void*)sg_list, start_i, num_sges_to_send, sg_list[0].length);
ibv_wr_set_sge_list(exec_params->device->qpex, (size_t)curr_iovcnt, sg_list);
num_sges_to_send -= curr_iovcnt;
start_i += curr_iovcnt;
DEBUG_LOG_FAST_PATH("RDMA Read/Write: mlx5dv_wr_set_dc_addr: mqpex=%p, ah=%p, rem_dctn=0x%06lx\n",
exec_params->device->mqpex, exec_params->ah, exec_params->rem_dctn);
mlx5dv_wr_set_dc_addr(exec_params->device->mqpex, exec_params->ah, exec_params->rem_dctn, DC_KEY);
}
} else {
exec_params->device->qpex->wr_flags = IBV_SEND_SIGNALED;
DEBUG_LOG_FAST_PATH("RDMA Read/Write: ibv_wr_rdma_%s: wr_id=0x%llx, qpex=%p, rkey=0x%lx, remote_buf=0x%llx\n",
exec_params->flags & RDMA_TASK_ATTR_RDMA_READ ? "read" : "write",
(long long unsigned int)exec_params->wr_id, exec_params->device->qpex, exec_params->rem_buf_rkey, (unsigned long long)exec_params->rem_buf_addr);
ibv_wr_rdma_rw_post(exec_params->device->qpex, exec_params->rem_buf_rkey, exec_params->rem_buf_addr);
DEBUG_LOG_FAST_PATH("RDMA Read/Write: ibv_wr_set_sge: qpex=%p, lkey=0x%x, local_buf=0x%llx, size=%u\n",
exec_params->device->qpex, exec_params->local_buf_mr_lkey,
(unsigned long long)exec_params->local_buf_addr, exec_params->rem_buf_size);
ibv_wr_set_sge(exec_params->device->qpex, exec_params->local_buf_mr_lkey, (uintptr_t)exec_params->local_buf_addr, exec_params->rem_buf_size);
DEBUG_LOG_FAST_PATH("RDMA Read/Write: mlx5dv_wr_set_dc_addr: mqpex=%p, ah=%p, rem_dctn=0x%06lx\n",
exec_params->device->mqpex, exec_params->ah, exec_params->rem_dctn);
mlx5dv_wr_set_dc_addr(exec_params->device->mqpex, exec_params->ah, exec_params->rem_dctn, DC_KEY);
}
/* ring DB */
DEBUG_LOG_FAST_PATH("ibv_wr_complete: qpex=%p, required_wr=%d\n", exec_params->device->qpex, required_wr);
ret_val = ibv_wr_complete(exec_params->device->qpex);
if (ret_val) {
DEBUG_LOG_FAST_PATH("FAILURE: ibv_wr_complete (error=%d\n", ret_val);
return ret_val;
}
#ifdef PRINT_LATENCY
ret_val = ibv_query_rt_values_ex(exec_params->device->context, &ts_values);
if (ret_val) {
fprintf(stderr, "ibv_query_rt_values_ex failed after ibv_wr_start call\n");
return 1;
}