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/*
* Implementation of the common RDMA functions.
*
* Authors: Animesh Trivedi
* [email protected]
*/
#include "rdma_common.h"
void show_rdma_cmid(struct rdma_cm_id *id)
{
if(!id){
rdma_error("Passed ptr is NULL\n");
return;
}
printf("RDMA cm id at %p \n", id);
if(id->verbs && id->verbs->device)
printf("dev_ctx: %p (device name: %s) \n", id->verbs,
id->verbs->device->name);
if(id->channel)
printf("cm event channel %p\n", id->channel);
printf("QP: %p, port_space %x, port_num %u \n", id->qp,
id->ps,
id->port_num);
}
void show_rdma_buffer_attr(struct rdma_buffer_attr *attr){
if(!attr){
rdma_error("Passed attr is NULL\n");
return;
}
printf("---------------------------------------------------------\n");
printf("buffer attr, addr: %p , len: %u , stag : 0x%x \n",
(void*) attr->address,
(unsigned int) attr->length,
attr->stag.local_stag);
printf("---------------------------------------------------------\n");
}
struct ibv_mr* rdma_buffer_alloc(struct ibv_pd *pd, uint32_t size,
enum ibv_access_flags permission)
{
struct ibv_mr *mr = NULL;
if (!pd) {
rdma_error("Protection domain is NULL \n");
return NULL;
}
void *buf = calloc(1, size);
if (!buf) {
rdma_error("failed to allocate buffer, -ENOMEM\n");
return NULL;
}
debug("Buffer allocated: %p , len: %u \n", buf, size);
mr = rdma_buffer_register(pd, buf, size, permission);
if(!mr){
free(buf);
}
return mr;
}
struct ibv_mr *rdma_buffer_register(struct ibv_pd *pd,
void *addr, uint32_t length,
enum ibv_access_flags permission)
{
struct ibv_mr *mr = NULL;
if (!pd) {
rdma_error("Protection domain is NULL, ignoring \n");
return NULL;
}
mr = ibv_reg_mr(pd, addr, length, permission);
if (!mr) {
rdma_error("Failed to create mr on buffer, errno: %d \n", -errno);
return NULL;
}
debug("Registered: %p , len: %u , stag: 0x%x \n",
mr->addr,
(unsigned int) mr->length,
mr->lkey);
return mr;
}
void rdma_buffer_free(struct ibv_mr *mr)
{
if (!mr) {
rdma_error("Passed memory region is NULL, ignoring\n");
return ;
}
void *to_free = mr->addr;
rdma_buffer_deregister(mr);
debug("Buffer %p free'ed\n", to_free);
free(to_free);
}
void rdma_buffer_deregister(struct ibv_mr *mr)
{
if (!mr) {
rdma_error("Passed memory region is NULL, ignoring\n");
return;
}
debug("Deregistered: %p , len: %u , stag : 0x%x \n",
mr->addr,
(unsigned int) mr->length,
mr->lkey);
ibv_dereg_mr(mr);
}
int process_rdma_cm_event(struct rdma_event_channel *echannel,
enum rdma_cm_event_type expected_event,
struct rdma_cm_event **cm_event)
{
int ret = 1;
ret = rdma_get_cm_event(echannel, cm_event);
if (ret) {
rdma_error("Failed to retrieve a cm event, errno: %d \n",
-errno);
return -errno;
}
/* lets see, if it was a good event */
if(0 != (*cm_event)->status){
rdma_error("CM event has non zero status: %d\n", (*cm_event)->status);
ret = -((*cm_event)->status);
/* important, we acknowledge the event */
rdma_ack_cm_event(*cm_event);
return ret;
}
/* if it was a good event, was it of the expected type */
if ((*cm_event)->event != expected_event) {
rdma_error("Unexpected event received: %s [ expecting: %s ]",
rdma_event_str((*cm_event)->event),
rdma_event_str(expected_event));
/* important, we acknowledge the event */
rdma_ack_cm_event(*cm_event);
return -1; // unexpected event :(
}
debug("A new %s type event is received \n", rdma_event_str((*cm_event)->event));
/* The caller must acknowledge the event */
return ret;
}
int process_work_completion_events (struct ibv_comp_channel *comp_channel,
struct ibv_wc *wc, int max_wc)
{
struct ibv_cq *cq_ptr = NULL;
void *context = NULL;
int ret = -1, i, total_wc = 0;
/* We wait for the notification on the CQ channel */
ret = ibv_get_cq_event(comp_channel, /* IO channel where we are expecting the notification */
&cq_ptr, /* which CQ has an activity. This should be the same as CQ we created before */
&context); /* Associated CQ user context, which we did set */
if (ret) {
rdma_error("Failed to get next CQ event due to %d \n", -errno);
return -errno;
}
/* Request for more notifications. */
ret = ibv_req_notify_cq(cq_ptr, 0);
if (ret){
rdma_error("Failed to request further notifications %d \n", -errno);
return -errno;
}
/* We got notification. We reap the work completion (WC) element. It is
* unlikely but a good practice it write the CQ polling code that
* can handle zero WCs. ibv_poll_cq can return zero. Same logic as
* MUTEX conditional variables in pthread programming.
*/
total_wc = 0;
do {
ret = ibv_poll_cq(cq_ptr /* the CQ, we got notification for */,
max_wc - total_wc /* number of remaining WC elements*/,
wc + total_wc/* where to store */);
if (ret < 0) {
rdma_error("Failed to poll cq for wc due to %d \n", ret);
/* ret is errno here */
return ret;
}
total_wc += ret;
} while (total_wc < max_wc);
debug("%d WC are completed \n", total_wc);
/* Now we check validity and status of I/O work completions */
for( i = 0 ; i < total_wc ; i++) {
if (wc[i].status != IBV_WC_SUCCESS) {
rdma_error("Work completion (WC) has error status: %s at index %d",
ibv_wc_status_str(wc[i].status), i);
/* return negative value */
return -(wc[i].status);
}
}
/* Similar to connection management events, we need to acknowledge CQ events */
ibv_ack_cq_events(cq_ptr,
1 /* we received one event notification. This is not
number of WC elements */);
return total_wc;
}
/* Code acknowledgment: rping.c from librdmacm/examples */
int get_addr(char *dst, struct sockaddr *addr)
{
struct addrinfo *res;
int ret = -1;
ret = getaddrinfo(dst, NULL, NULL, &res);
if (ret) {
rdma_error("getaddrinfo failed - invalid hostname or IP address\n");
return ret;
}
memcpy(addr, res->ai_addr, sizeof(struct sockaddr_in));
freeaddrinfo(res);
return ret;
}
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