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resources.c
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resources.c
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/* vim: set noet: */
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <arpa/inet.h>
#include <infiniband/verbs.h>
#include "resources.h"
#include "sockets.h"
/******************************************************************************
* * Function: post_receive
* *
* * Input
* * res pointer to resources structure
* *
* * Output
* * none
* *
* * Returns
* * 0 on success, error code on failure
* *
* * Description
* *
* ******************************************************************************/
static int post_receive(struct resources *res)
{
struct ibv_recv_wr rr;
struct ibv_sge sge;
struct ibv_recv_wr *bad_wr;
int rc;
/* prepare the scatter/gather entry */
memset(&sge, 0, sizeof(sge));
sge.addr = (uintptr_t)res->buf;
sge.length = config.msg_size;
sge.lkey = res->mr->lkey;
/* prepare the receive work request */
memset(&rr, 0, sizeof(rr));
rr.next = NULL;
rr.wr_id = 0;
rr.sg_list = &sge;
rr.num_sge = 1;
/* post the Receive Request to the RQ */
rc = ibv_post_recv(res->qp, &rr, &bad_wr);
if (rc)
fprintf(stderr, "failed to post RR\n");
else
debug_print("Receive Request was posted\n");
return rc;
}
/**
* Pin all current and future memory pages in memory so that the OS does not
* swap them to disk.
*
* Note that future mapping operations (e.g. mmap, stack expansion, etc)
* may fail if their memory cannot be pinned due to resource limits. Thus the
* check below may not capture all possible failures up front. It's probably
* best to call this at the end of initialisation (after most large allocations
* have been made).
*/
static void pin_all_memory() {
int r = mlockall(MCL_CURRENT | MCL_FUTURE);
if (r != 0) {
fprintf(stderr, "Could not lock all memory pages (%s)\n", strerror(errno));
}
}
void resources_init(struct resources *res)
{
memset(res, 0, sizeof *res);
res->sock = -1;
}
int resources_create(struct resources *res)
{
struct ibv_device **dev_list = NULL;
struct ibv_qp_init_attr qp_init_attr;
struct ibv_device *ib_dev = NULL;
size_t size;
int i, j;
int mr_flags = 0;
int cq_size = 0;
int num_devices;
int rc = 0;
char curr_num = 0;
if (config.server_name) {
/* Client side */
res->sock = sock_connect(config.server_name, config.tcp_port);
if (res->sock < 0) {
fprintf(stderr, "[Client only] failed to establish TCP connection to server %s, port %d\n", config.server_name, config.tcp_port);
rc = -1;
goto resources_create_exit;
}
} else {
/* server side */
debug_print("[Server only] waiting on port %d for TCP connection\n", config.tcp_port);
res->sock = sock_connect(NULL, config.tcp_port);
if (res->sock < 0) {
fprintf(stderr, "[Server only] failed to establish TCP connection with client on port %d\n", config.tcp_port);
rc = -1;
goto resources_create_exit;
}
}
debug_print("TCP connection was established\n");
debug_print("searching for IB devices in host\n");
/* get device names in the system */
dev_list = ibv_get_device_list(&num_devices);
if (!dev_list) {
fprintf(stderr, "failed to get IB devices list\n");
rc = 1;
goto resources_create_exit;
}
/* if there isn't any IB device in host */
if (!num_devices) {
fprintf(stderr, "found %d device(s)\n", num_devices);
rc = 1;
goto resources_create_exit;
}
debug_print("found %d device(s)\n", num_devices);
/* search for the specific device we want to work with */
for (i = 0; i < num_devices; i ++) {
if (!config.dev_name) {
config.dev_name = strdup(ibv_get_device_name(dev_list[i]));
debug_print("device not specified, using first one found: %s\n", config.dev_name);
}
if (!strcmp(ibv_get_device_name(dev_list[i]), config.dev_name)) {
ib_dev = dev_list[i];
break;
}
}
/* if the device wasn't found in host */
if (!ib_dev) {
fprintf(stderr, "IB device %s wasn't found\n", config.dev_name);
rc = 1;
goto resources_create_exit;
}
/* get device handle */
res->ib_ctx = ibv_open_device(ib_dev);
if (!res->ib_ctx) {
fprintf(stderr, "failed to open device %s\n", config.dev_name);
rc = 1;
goto resources_create_exit;
}
/* We are now done with device list, free it */
ibv_free_device_list(dev_list);
dev_list = NULL;
ib_dev = NULL;
/* query port properties */
if (ibv_query_port(res->ib_ctx, config.ib_port, &res->port_attr)) {
fprintf(stderr, "ibv_query_port on port %u failed\n", config.ib_port);
rc = 1;
goto resources_create_exit;
}
/* allocate Protection Domain */
res->pd = ibv_alloc_pd(res->ib_ctx);
if (!res->pd) {
fprintf(stderr, "ibv_alloc_pd failed\n");
rc = 1;
goto resources_create_exit;
}
/* each side will send only one WR, so Completion Queue with 1 entry is enough */
cq_size = 1;
res->cq = ibv_create_cq(res->ib_ctx, cq_size, NULL, NULL, 0);
if (!res->cq) {
fprintf(stderr, "failed to create CQ with %u entries\n", cq_size);
rc = 1;
goto resources_create_exit;
}
/* allocate the memory buffer that will hold the data */
if (!config.server_name)
size = config.row_count * (config.column_count * config.msg_size);
else
size = config.msg_size;
res->buf = (char *) malloc(size);
pin_all_memory();
if (!res->buf) {
fprintf(stderr, "failed to malloc %Zu bytes to memory buffer\n", size);
rc = 1;
goto resources_create_exit;
}
if (!config.server_name) {
for (i = 0; i < config.row_count; i++) {
for (j = 0; j < config.column_count; j++) {
res->buf[j * (config.column_count * config.msg_size) + i * (config.msg_size)] = curr_num;
curr_num++;
}
}
}
else
memset(res->buf, 0 , size);
/* register the memory buffer */
mr_flags = IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE;
res->mr = ibv_reg_mr(res->pd, res->buf, size, mr_flags);
if (!res->mr) {
fprintf(stderr, "ibv_reg_mr failed with mr_flags=0x%x\n", mr_flags);
rc = 1;
goto resources_create_exit;
}
debug_print("MR was registered with addr=%p, lkey=0x%x, rkey=0x%x, flags=0x%x\n", res->buf, res->mr->lkey, res->mr->rkey, mr_flags);
/* create the Queue Pair */
memset(&qp_init_attr, 0, sizeof(qp_init_attr));
qp_init_attr.qp_type = IBV_QPT_RC;
qp_init_attr.sq_sig_all = 0;
qp_init_attr.send_cq = res->cq;
qp_init_attr.recv_cq = res->cq;
qp_init_attr.cap.max_send_wr = 1;
qp_init_attr.cap.max_recv_wr = 1;
qp_init_attr.cap.max_send_sge = 1;
qp_init_attr.cap.max_recv_sge = 1;
res->qp = ibv_create_qp(res->pd, &qp_init_attr);
if (!res->qp) {
fprintf(stderr, "failed to create QP\n");
rc = 1;
goto resources_create_exit;
}
debug_print("QP was created, QP number=0x%x\n", res->qp->qp_num);
resources_create_exit:
if (rc) {
/* Error encountered, cleanup */
if (res->qp) {
ibv_destroy_qp(res->qp);
res->qp = NULL;
}
if (res->mr) {
ibv_dereg_mr(res->mr);
res->mr = NULL;
}
if (res->buf) {
free(res->buf);
res->buf = NULL;
}
if (res->cq) {
ibv_destroy_cq(res->cq);
res->cq = NULL;
}
if (res->pd) {
ibv_dealloc_pd(res->pd);
res->pd = NULL;
}
if (res->ib_ctx) {
ibv_close_device(res->ib_ctx);
res->ib_ctx = NULL;
}
if (dev_list) {
ibv_free_device_list(dev_list);
dev_list = NULL;
}
if (res->sock >= 0) {
if (close(res->sock))
fprintf(stderr, "failed to close socket\n");
res->sock = -1;
}
}
return rc;
}
int modify_qp_to_init(struct ibv_qp *qp)
{
struct ibv_qp_attr attr;
int flags;
int rc;
memset(&attr, 0, sizeof(attr));
attr.qp_state = IBV_QPS_INIT;
attr.port_num = config.ib_port;
attr.pkey_index = 0;
attr.qp_access_flags = IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE;
flags = IBV_QP_STATE | IBV_QP_PKEY_INDEX | IBV_QP_PORT | IBV_QP_ACCESS_FLAGS;
rc = ibv_modify_qp(qp, &attr, flags);
if (rc)
fprintf(stderr, "failed to modify QP state to INIT (%s)\n", strerror(errno));
return rc;
}
int modify_qp_to_rtr(struct ibv_qp *qp, uint32_t remote_qpn, uint16_t dlid, const uint8_t *dgid)
{
struct ibv_qp_attr attr;
int flags;
int rc;
memset(&attr, 0, sizeof(attr));
attr.qp_state = IBV_QPS_RTR;
attr.path_mtu = IBV_MTU_2048;
attr.dest_qp_num = remote_qpn;
attr.rq_psn = 0;
attr.max_dest_rd_atomic = 1;
attr.min_rnr_timer = 0x12;
attr.ah_attr.is_global = 0;
attr.ah_attr.dlid = dlid;
attr.ah_attr.sl = 0;
attr.ah_attr.src_path_bits = 0;
attr.ah_attr.port_num = config.ib_port;
if (config.gid_idx >= 0) {
attr.ah_attr.is_global = 1;
attr.ah_attr.port_num = 1;
memcpy(&attr.ah_attr.grh.dgid, dgid, 16);
attr.ah_attr.grh.flow_label = 0;
attr.ah_attr.grh.hop_limit = 1;
attr.ah_attr.grh.sgid_index = config.gid_idx;
attr.ah_attr.grh.traffic_class = 0;
}
flags = IBV_QP_STATE | IBV_QP_AV | IBV_QP_PATH_MTU | IBV_QP_DEST_QPN | IBV_QP_RQ_PSN | IBV_QP_MAX_DEST_RD_ATOMIC | IBV_QP_MIN_RNR_TIMER;
rc = ibv_modify_qp(qp, &attr, flags);
if (rc)
fprintf(stderr, "failed to modify QP state to RTR (%s)\n", strerror(errno));
return rc;
}
int modify_qp_to_rts(struct ibv_qp *qp)
{
struct ibv_qp_attr attr;
int flags;
int rc;
memset(&attr, 0, sizeof(attr));
attr.qp_state = IBV_QPS_RTS;
attr.timeout = 0x12;
attr.retry_cnt = 6;
attr.rnr_retry = 0;
attr.sq_psn = 0;
attr.max_rd_atomic = 1;
flags = IBV_QP_STATE | IBV_QP_TIMEOUT | IBV_QP_RETRY_CNT | IBV_QP_RNR_RETRY | IBV_QP_SQ_PSN | IBV_QP_MAX_QP_RD_ATOMIC;
rc = ibv_modify_qp(qp, &attr, flags);
if (rc)
fprintf(stderr, "failed to modify QP state to RTS (%s)\n", strerror(errno));
return rc;
}
int connect_qp(struct resources *res)
{
struct cm_con_data_t local_con_data;
struct cm_con_data_t remote_con_data;
struct cm_con_data_t tmp_con_data;
int rc = 0;
char temp_char;
union ibv_gid my_gid;
if (config.gid_idx >= 0) {
rc = ibv_query_gid(res->ib_ctx, config.ib_port, config.gid_idx, &my_gid);
if (rc) {
fprintf(stderr, "could not get gid for port %d, index %d\n", config.ib_port, config.gid_idx);
return rc;
}
} else
memset(&my_gid, 0, sizeof my_gid);
/* exchange using TCP sockets info required to connect QPs */
local_con_data.addr = htonll((uintptr_t)res->buf);
local_con_data.rkey = htonl(res->mr->rkey);
local_con_data.qp_num = htonl(res->qp->qp_num);
local_con_data.lid = htons(res->port_attr.lid);
memcpy(local_con_data.gid, &my_gid, sizeof(my_gid));
debug_print("\nLocal LID = 0x%x\n", res->port_attr.lid);
if (sock_sync_data(res->sock, sizeof(struct cm_con_data_t), (char *) &local_con_data, (char *) &tmp_con_data) < 0) {
fprintf(stderr, "failed to exchange connection data between sides\n");
return 1;
}
remote_con_data.addr = ntohll(tmp_con_data.addr);
remote_con_data.rkey = ntohl(tmp_con_data.rkey);
remote_con_data.qp_num = ntohl(tmp_con_data.qp_num);
remote_con_data.lid = ntohs(tmp_con_data.lid);
memcpy(remote_con_data.gid, tmp_con_data.gid, sizeof(my_gid));
/* save the remote side attributes, we will need it for the post SR */
res->remote_props = remote_con_data;
debug_print("Remote address = 0x%"PRIx64"\n", remote_con_data.addr);
debug_print("Remote rkey = 0x%x\n", remote_con_data.rkey);
debug_print("Remote QP number = 0x%x\n", remote_con_data.qp_num);
debug_print("Remote LID = 0x%x\n", remote_con_data.lid);
if (config.gid_idx >= 0) {
const uint8_t *p = remote_con_data.gid;
debug_print("Remote GID = %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7], p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
}
/* modify the QP to init */
rc = modify_qp_to_init(res->qp);
if (rc) {
fprintf(stderr, "change QP state to INIT failed\n");
return rc;
}
/* let the client post RR to be prepared for incoming messages */
if (config.server_name) {
rc = post_receive(res);
if (rc) {
fprintf(stderr, "failed to post RR\n");
return rc;
}
}
/* modify the QP to RTR */
rc = modify_qp_to_rtr(res->qp, remote_con_data.qp_num, remote_con_data.lid, remote_con_data.gid);
if (rc) {
fprintf(stderr, "failed to modify QP state to RTR (%s)\n", strerror(errno));
return rc;
}
rc = modify_qp_to_rts(res->qp);
if (rc) {
fprintf(stderr, "failed to modify QP state to RTS (%s)\n", strerror(errno));
return rc;
}
debug_print("QP state was change to RTS\n");
/* sync to make sure that both sides are in states that they can connect to prevent packet loose */
if (sock_sync_data(res->sock, 1, "Q", &temp_char)) { /* just send a dummy char back and forth */
fprintf(stderr, "sync error after QPs were moved to RTS\n");
return rc;
}
return 0;
}
int resources_destroy(struct resources *res)
{
int rc = 0;
if (res->qp)
if (ibv_destroy_qp(res->qp)) {
fprintf(stderr, "failed to destroy QP\n");
rc = 1;
}
if (res->mr)
if (ibv_dereg_mr(res->mr)) {
fprintf(stderr, "failed to deregister MR\n");
rc = 1;
}
if (res->buf)
free(res->buf);
if (res->cq)
if (ibv_destroy_cq(res->cq)) {
fprintf(stderr, "failed to destroy CQ\n");
rc = 1;
}
if (res->pd)
if (ibv_dealloc_pd(res->pd)) {
fprintf(stderr, "failed to deallocate PD\n");
rc = 1;
}
if (res->ib_ctx)
if (ibv_close_device(res->ib_ctx)) {
fprintf(stderr, "failed to close device context\n");
rc = 1;
}
if (res->sock >= 0)
if (close(res->sock)) {
fprintf(stderr, "failed to close socket\n");
rc = 1;
}
return rc;
}