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authorSean Hefty <sean.hefty@intel.com>2013-05-29 10:09:27 -0700
committerRoland Dreier <roland@purestorage.com>2013-06-20 23:35:40 -0700
commitac53b264b2f39e89781e3b855008123dfdb44aea (patch)
treec72f7ee7aed7071da300d1f5cb52b0767b949ef5 /drivers/infiniband/core
parent2e08b5879e9244fa893fe09f5b887f72f4e6c29b (diff)
downloadblackbird-op-linux-ac53b264b2f39e89781e3b855008123dfdb44aea.tar.gz
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RDMA/ucma: Support querying when IB paths are not reversible
The current query_route call can return up to two path records. The assumption being that one is the primary path, with optional support for an alternate path. In both cases, the paths are assumed to be reversible and are used to send CM MADs. With the ability to manually set IB path data, the rdma cm can eventually be capable of using up to 6 paths per connection: forward primary, reverse primary, forward alternate, reverse alternate, reversible primary path for CM MADs reversible alternate path for CM MADs. (It is unclear at this time if IB routing will complicate this) In order to handle more flexible routing topologies, add a new command to report any number of paths. Signed-off-by: Sean Hefty <sean.hefty@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/ucma.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 18bdccc0c2ec..722f2ff0400f 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -750,6 +750,38 @@ static ssize_t ucma_query_addr(struct ucma_context *ctx,
return ret;
}
+static ssize_t ucma_query_path(struct ucma_context *ctx,
+ void __user *response, int out_len)
+{
+ struct rdma_ucm_query_path_resp *resp;
+ int i, ret = 0;
+
+ if (out_len < sizeof(*resp))
+ return -ENOSPC;
+
+ resp = kzalloc(out_len, GFP_KERNEL);
+ if (!resp)
+ return -ENOMEM;
+
+ resp->num_paths = ctx->cm_id->route.num_paths;
+ for (i = 0, out_len -= sizeof(*resp);
+ i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
+ i++, out_len -= sizeof(struct ib_path_rec_data)) {
+
+ resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
+ IB_PATH_BIDIRECTIONAL;
+ ib_sa_pack_path(&ctx->cm_id->route.path_rec[i],
+ &resp->path_data[i].path_rec);
+ }
+
+ if (copy_to_user(response, resp,
+ sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
+ ret = -EFAULT;
+
+ kfree(resp);
+ return ret;
+}
+
static ssize_t ucma_query(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
@@ -771,6 +803,9 @@ static ssize_t ucma_query(struct ucma_file *file,
case RDMA_USER_CM_QUERY_ADDR:
ret = ucma_query_addr(ctx, response, out_len);
break;
+ case RDMA_USER_CM_QUERY_PATH:
+ ret = ucma_query_path(ctx, response, out_len);
+ break;
default:
ret = -ENOSYS;
break;
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