[PATCH 11/16] librdmacm/rs-preload: Use environment variable to set QP size

[Hefty, Sean]

Allow the user to specify the size of the send/receive queues
and inline data size through environment variables:
RS_SQ_SIZE, RS_RQ_SIZE, and RS_INLINE.

Signed-off-by: Sean Hefty <sean.he...@intel.com>
---
 src/preload.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/src/preload.c b/src/preload.c
index 99afd26..d21389f 100644
--- a/src/preload.c
+++ b/src/preload.c
@@ -97,6 +97,10 @@ static int (*real_fcntl)(int socket, int cmd, ... /* arg */);
 static struct index_map idm;
 static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
 
+static int sq_size;
+static int rq_size;
+static int sq_inline;
+
 enum fd_type {
        fd_normal,
        fd_rsocket
@@ -196,6 +200,23 @@ static enum fd_type fd_close(int index, int *fd)
        return type;
 }
 
+void getenv_options(void)
+{
+       char *var;
+
+       var = getenv("RS_SQ_SIZE");
+       if (var)
+               sq_size = atoi(var);
+
+       var = getenv("RS_RQ_SIZE");
+       if (var)
+               rq_size = atoi(var);
+
+       var = getenv("RS_INLINE");
+       if (var)
+               sq_inline = atoi(var);
+}
+
 static void init_preload(void)
 {
        static int init;
@@ -231,6 +252,8 @@ static void init_preload(void)
        real_setsockopt = dlsym(RTLD_NEXT, "setsockopt");
        real_getsockopt = dlsym(RTLD_NEXT, "getsockopt");
        real_fcntl = dlsym(RTLD_NEXT, "fcntl");
+
+       getenv_options();
        init = 1;
 out:
        pthread_mutex_unlock(&mut);
@@ -285,6 +308,21 @@ err:
        return ret;
 }
 
+/*
+ * Use defaults on failure.
+ */
+void set_rsocket_options(int rsocket)
+{
+       if (sq_size)
+               rsetsockopt(rsocket, SOL_RDMA, RDMA_SQSIZE, &sq_size, sizeof 
sq_size);
+
+       if (rq_size)
+               rsetsockopt(rsocket, SOL_RDMA, RDMA_RQSIZE, &rq_size, sizeof 
rq_size);
+
+       if (sq_inline)
+               rsetsockopt(rsocket, SOL_RDMA, RDMA_INLINE, &sq_inline, sizeof 
sq_inline);
+}
+
 int socket(int domain, int type, int protocol)
 {
        static __thread int recursive;
@@ -303,6 +341,7 @@ int socket(int domain, int type, int protocol)
        recursive = 0;
        if (ret >= 0) {
                fd_store(index, ret, fd_rsocket);
+               set_rsocket_options(ret);
                return index;
        }
        fd_close(index, &ret);


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