RDMA requires the user to allocate hardware resources before
establishing a connection. To support this, the user must know
the source address that the connection will use to reach the
remote endpoint. Modify rdma_getaddrinfo to determine an
appropriate source address based on the specified destination,
when a source address is not given.
Signed-off-by: Sean Hefty <sean.he...@intel.com>
---
src/addrinfo.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 60 insertions(+), 0 deletions(-)
diff --git a/src/addrinfo.c b/src/addrinfo.c
index 15ae071..dfaf9d5 100644
--- a/src/addrinfo.c
+++ b/src/addrinfo.c
@@ -39,6 +39,7 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
+#include <unistd.h>
#include "cma.h"
#include <rdma/rdma_cma.h>
@@ -129,6 +130,48 @@ static int ucma_convert_to_rai(struct rdma_addrinfo *rai,
struct addrinfo *ai)
return 0;
}
+static int ucma_resolve_src(struct rdma_addrinfo *rai)
+{
+ struct sockaddr *addr;
+ socklen_t len;
+ int ret, s;
+
+ s = socket(rai->ai_family, SOCK_DGRAM, IPPROTO_UDP);
+ if (s < 0)
+ return s;
+
+ ret = connect(s, rai->ai_dst_addr, rai->ai_dst_len);
+ if (ret)
+ goto err1;
+
+ addr = zalloc(rai->ai_dst_len);
+ if (!addr) {
+ ret = ERR(ENOMEM);
+ goto err1;
+ }
+
+ len = rai->ai_dst_len;
+ ret = getsockname(s, addr, &len);
+ if (ret)
+ goto err2;
+
+ if (addr->sa_family == AF_INET)
+ ((struct sockaddr_in *) addr)->sin_port = 0;
+ else
+ ((struct sockaddr_in6 *) addr)->sin6_port = 0;
+ rai->ai_src_addr = addr;
+ rai->ai_src_len = len;
+
+ close(s);
+ return 0;
+
+err2:
+ free(addr);
+err1:
+ close(s);
+ return ret;
+}
+
int rdma_getaddrinfo(char *node, char *service,
struct rdma_addrinfo *hints,
struct rdma_addrinfo **res)
@@ -159,6 +202,23 @@ int rdma_getaddrinfo(char *node, char *service,
if (ret)
goto err2;
+ if (!rai->ai_src_len) {
+ if (hints && hints->ai_src_len) {
+ rai->ai_src_addr = zalloc(hints->ai_src_len);
+ if (!rai->ai_src_addr) {
+ ret = ERR(ENOMEM);
+ goto err2;
+ }
+ memcpy(rai->ai_src_addr, hints->ai_src_addr,
+ hints->ai_src_len);
+ rai->ai_src_len = hints->ai_src_len;
+ } else {
+ ret = ucma_resolve_src(rai);
+ if (ret)
+ goto err2;
+ }
+ }
+
freeaddrinfo(ai);
*res = rai;
return 0;
--
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