Perftest: Add null-mr support over server side

Currently perftest support null-mr over client only (sender).
this commit add support over server side (receiver).

Signed-off-by: Shmuel Shaul <[email protected]>

Author: sshaulnv

man/perftest.1

@@ -345,7 +345,7 @@ many different options and modes.
  Not relevant for raw_ethernet_fs_rate.
 .TP
 .B --use-null-mr
- Allocate a null memory region for the client with \fBibv_alloc_null_mr\fR(3)
+ Allocate a null memory region with \fBibv_alloc_null_mr\fR(3)
 .TP
 .B --use_cuda=<cuda device id>
  Use CUDA specific device for GPUDirect RDMA testing.

src/perftest_communication.c

@@ -904,7 +904,7 @@ int set_up_connection(struct pingpong_context *ctx,
 
 		my_dest[i].qpn   = ctx->qp[i]->qp_num;
 		my_dest[i].psn   = lrand48() & 0xffffff;
-		my_dest[i].rkey  = ctx->mr[i]->rkey;
+		my_dest[i].rkey = user_param->use_null_mr ? ctx->null_mr->lkey : ctx->mr[i]->rkey;
 
 		/* Each qp gives his receive buffer address.*/
 		my_dest[i].out_reads = user_param->out_reads;

src/perftest_parameters.c

@@ -689,7 +689,7 @@ static void usage(const char *argv0, VerbType verb, TestType tst, int connection
 
 	if (verb == WRITE || verb == WRITE_IMM || verb == READ) {
 		printf("      --use-null-mr ");
-		printf(" Allocate a null memory region for the client with ibv_alloc_null_mr.\n");
+		printf(" Allocate a null memory region with ibv_alloc_null_mr.\n");
 	}
 
 	if (tst == BW || tst == LAT_BY_BW) {

src/perftest_resources.c

@@ -3166,10 +3166,7 @@ void ctx_set_send_reg_wqes(struct pingpong_context *ctx,
 			ctx->sge_list[i*user_param->post_list + j].length =
 				(user_param->connection_type == RawEth) ? (user_param->size - HW_CRC_ADDITION) : user_param->size;
 
-			ctx->sge_list[i*user_param->post_list + j].lkey = ctx->mr[i]->lkey;
-			if (user_param->use_null_mr) {
-				ctx->sge_list[i*user_param->post_list + j].lkey = ctx->null_mr->lkey;
-			}
+			ctx->sge_list[i*user_param->post_list + j].lkey = user_param->use_null_mr ? ctx->null_mr->lkey : ctx->mr[i]->lkey;
 
 			if (j > 0) {
 
@@ -3319,7 +3316,7 @@ int ctx_set_recv_wqes(struct pingpong_context *ctx,struct perftest_parameters *u
 
 		for (j = 0; j < user_param->recv_post_list; j++) {
 			ctx->recv_sge_list[i * user_param->recv_post_list + j].length = length;
-			ctx->recv_sge_list[i * user_param->recv_post_list + j].lkey   = ctx->mr[i]->lkey;
+			ctx->recv_sge_list[i * user_param->recv_post_list + j].lkey   = user_param->use_null_mr ? ctx->null_mr->lkey : ctx->mr[i]->lkey;
 
 			if (j > 0) {
 				ctx->recv_sge_list[i * user_param->recv_post_list + j].addr = ctx->recv_sge_list[i * user_param->recv_post_list + j - 1].addr;