From: Honggang Li <honli@xxxxxxxxxx>
commit 882981f4a411 ("RDMA/srp: Add support for immediate data")
commit 547ed331bbe8 ("RDMA/srp: Add parse function for maximum
initiator to target IU size")
The use_imm_data kernel module parameter was introduced in kernel
v5.0 (882981f4a411). The max_it_iu_size will be introduced in kernel
v5.5 (547ed331bbe8).
We need the 'max_it_iu_size' for old SRPT, which does not support
immediate data.
The ib_srp module will emit a warning message of unknown parameter,
if we blindly append the 'max_it_iu_size' at the very end of login
string for kernel before 547ed331bbe8.
With this flag, srp_daemon will know the 'max_it_iu_size' login option
is available or not, by checking the file [1].
[1] /sys/module/ib_srp/parameters/has_max_it_iu_size
Signed-off-by: Honggang Li <honli@xxxxxxxxxx>
---
drivers/infiniband/ulp/srp/ib_srp.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index b7f7a5f7bd98..96434f743a91 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -74,6 +74,7 @@ static bool allow_ext_sg;
static bool prefer_fr = true;
static bool register_always = true;
static bool never_register;
+static bool has_max_it_iu_size = true;
static int topspin_workarounds = 1;
module_param(srp_sg_tablesize, uint, 0444);
@@ -103,6 +104,10 @@ module_param(register_always, bool, 0444);
MODULE_PARM_DESC(register_always,
"Use memory registration even for contiguous memory regions");
+module_param(has_max_it_iu_size, bool, 0444);
+MODULE_PARM_DESC(has_max_it_iu_size,
+ "Indicate the module supports max_it_iu_size login parameter");
+
module_param(never_register, bool, 0444);
MODULE_PARM_DESC(never_register, "Never register memory");
--
2.21.0
