[ofa-general] [RFC] [PATCH 3/3] 2.6.22 or 23 rdma/cm: check cache for path records

[Sean Hefty]

RDMA/cma: use local SA cache for path queries

From: Sean Hefty <[EMAIL PROTECTED]>

Have the rdma_cm check the local SA cache for path records before
querying the remote SA.  This improves path record lookup time and
scale-out connection rates.

Signed-off-by: Sean Hefty <[EMAIL PROTECTED]>
---

 drivers/infiniband/core/cma.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index fde92ce..c8e2024 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -45,6 +45,7 @@
 #include <rdma/ib_cm.h>
 #include <rdma/ib_sa.h>
 #include <rdma/iw_cm.h>
+#include <rdma/ib_local_sa.h>
 
 MODULE_AUTHOR("Sean Hefty");
 MODULE_DESCRIPTION("Generic RDMA CM Agent");
@@ -1529,6 +1530,7 @@ out:
 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int 
timeout_ms)
 {
        struct rdma_route *route = &id_priv->id.route;
+       struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
        struct cma_work *work;
        int ret;
 
@@ -1548,9 +1550,20 @@ static int cma_resolve_ib_route(struct rdma_id_private 
*id_priv,
int timeout_ms)
                goto err1;
        }
 
-       ret = cma_query_ib_route(id_priv, timeout_ms, work);
-       if (ret)
-               goto err2;
+       ib_addr_get_sgid(addr, &route->path_rec->sgid);
+       ib_addr_get_dgid(addr, &route->path_rec->dgid);
+       ret = ib_get_path_rec(id_priv->id.device, id_priv->id.port_num,
+                             &route->path_rec->sgid, &route->path_rec->dgid,
+                             ib_addr_get_pkey(addr), route->path_rec);
+       if (!ret) {
+               route->num_paths = 1;
+               queue_work(cma_wq, &work->work);
+       } else {
+               if (ret == -ENODATA)
+                       ret = cma_query_ib_route(id_priv, timeout_ms, work);
+               if (ret)
+                       goto err2;
+       }
 
        return 0;
 err2:

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