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authorHaggai Eran <haggaie@mellanox.com>2015-02-08 13:28:51 +0200
committerRoland Dreier <roland@purestorage.com>2015-02-18 08:36:26 -0800
commitf4056bfd8ccff4475417078d6e5456dfa1962dd3 (patch)
tree55d91fc332726876bf87ca386c7a1308da13d6d7 /drivers/infiniband/core/uverbs_cmd.c
parentIB/core: Add support for extended query device caps (diff)
downloadlinux-dev-f4056bfd8ccff4475417078d6e5456dfa1962dd3.tar.xz
linux-dev-f4056bfd8ccff4475417078d6e5456dfa1962dd3.zip
IB/core: Add on demand paging caps to ib_uverbs_ex_query_device
Add on-demand paging capabilities reporting to the extended query device verb. Yann Droneaud writes: Note: as offsetof() is used to retrieve the size of the lower chunk of the response, beware that it only works if the upper chunk is right after, without any implicit padding. And, as the size of the latter chunk is added to the base size, implicit padding at the end of the structure is not taken in account. Both point must be taken in account when extending the uverbs functionalities. Signed-off-by: Haggai Eran <haggaie@mellanox.com> Reviewed-by: Yann Droneaud <ydroneaud@opteya.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core/uverbs_cmd.c')
-rw-r--r--drivers/infiniband/core/uverbs_cmd.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 8f507538c42b..04ca04559ce5 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3318,7 +3318,7 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
if (cmd.reserved)
return -EINVAL;
- resp.response_length = sizeof(resp);
+ resp.response_length = offsetof(typeof(resp), odp_caps);
if (ucore->outlen < resp.response_length)
return -ENOSPC;
@@ -3330,6 +3330,24 @@ int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
copy_query_dev_fields(file, &resp.base, &attr);
resp.comp_mask = 0;
+ if (ucore->outlen < resp.response_length + sizeof(resp.odp_caps))
+ goto end;
+
+#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
+ resp.odp_caps.general_caps = attr.odp_caps.general_caps;
+ resp.odp_caps.per_transport_caps.rc_odp_caps =
+ attr.odp_caps.per_transport_caps.rc_odp_caps;
+ resp.odp_caps.per_transport_caps.uc_odp_caps =
+ attr.odp_caps.per_transport_caps.uc_odp_caps;
+ resp.odp_caps.per_transport_caps.ud_odp_caps =
+ attr.odp_caps.per_transport_caps.ud_odp_caps;
+ resp.odp_caps.reserved = 0;
+#else
+ memset(&resp.odp_caps, 0, sizeof(resp.odp_caps));
+#endif
+ resp.response_length += sizeof(resp.odp_caps);
+
+end:
err = ib_copy_to_udata(ucore, &resp, resp.response_length);
if (err)
return err;