[PATCH] IB: userspace SRQ support

Add SRQ support to userspace verbs module.  This adds several commands
and associated structures, but it's OK to do this without bumping the
ABI version because the commands are added at the end of the list so
they don't change the existing numbering.  There are two cases to
worry about:

1. New kernel, old userspace.  This is OK because old userspace simply
   won't try to use the new SRQ commands.  None of the old commands are
   changed.

2. Old kernel, new userspace.  This works perfectly as long as
   userspace doesn't try to use SRQ commands.  If userspace tries to
   use SRQ commands, it will get EINVAL, which is perfectly
   reasonable: the kernel doesn't support SRQs, so we couldn't do any
   better.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 34 insertions, 1 deletions

diff --git a/drivers/infiniband/include/ib_user_verbs.h b/drivers/infiniband/include/ib_user_verbs.h
index 35857857aa3e..7ebb01c8f996 100644
--- a/drivers/infiniband/include/ib_user_verbs.h
+++ b/drivers/infiniband/include/ib_user_verbs.h
@@ -78,7 +78,12 @@ enum {
 	IB_USER_VERBS_CMD_POST_SEND,
 	IB_USER_VERBS_CMD_POST_RECV,
 	IB_USER_VERBS_CMD_ATTACH_MCAST,
-	IB_USER_VERBS_CMD_DETACH_MCAST
+	IB_USER_VERBS_CMD_DETACH_MCAST,
+	IB_USER_VERBS_CMD_CREATE_SRQ,
+	IB_USER_VERBS_CMD_MODIFY_SRQ,
+	IB_USER_VERBS_CMD_QUERY_SRQ,
+	IB_USER_VERBS_CMD_DESTROY_SRQ,
+	IB_USER_VERBS_CMD_POST_SRQ_RECV
 };
 
 /*
@@ -386,4 +391,32 @@ struct ib_uverbs_detach_mcast {
 	__u64 driver_data[0];
 };
 
+struct ib_uverbs_create_srq {
+	__u64 response;
+	__u64 user_handle;
+	__u32 pd_handle;
+	__u32 max_wr;
+	__u32 max_sge;
+	__u32 srq_limit;
+	__u64 driver_data[0];
+};
+
+struct ib_uverbs_create_srq_resp {
+	__u32 srq_handle;
+};
+
+struct ib_uverbs_modify_srq {
+	__u32 srq_handle;
+	__u32 attr_mask;
+	__u32 max_wr;
+	__u32 max_sge;
+	__u32 srq_limit;
+	__u32 reserved;
+	__u64 driver_data[0];
+};
+
+struct ib_uverbs_destroy_srq {
+	__u32 srq_handle;
+};
+
 #endif /* IB_USER_VERBS_H */