IB/uverbs: Allow resize CQ operation to return driver-specific data

Add a ib_uverbs_resize_cq_resp.driver_data field so that low-level
drivers can return data from a resize CQ operation to userspace.  Have
ib_uverbs_resize_cq() only copy the cqe field, to avoid having to bump
the userspace ABI.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 8b6df7c..deae43f 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -879,11 +879,10 @@ ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
        if (ret)
                goto out;
 
-       memset(&resp, 0, sizeof resp);
        resp.cqe = cq->cqe;
 
        if (copy_to_user((void __user *) (unsigned long) cmd.response,
-                        &resp, sizeof resp))
+                        &resp, sizeof resp.cqe))
                ret = -EFAULT;
 
 out:

diff --git a/include/rdma/ib_user_verbs.h b/include/rdma/ib_user_verbs.h
index 7b53720..db1b814 100644 (file)
--- a/include/rdma/ib_user_verbs.h
+++ b/include/rdma/ib_user_verbs.h
@@ -275,6 +275,8 @@ struct ib_uverbs_resize_cq {
 
 struct ib_uverbs_resize_cq_resp {
        __u32 cqe;
+       __u32 reserved;
+       __u64 driver_data[0];
 };
 
 struct ib_uverbs_poll_cq {