IB/srp: Do not register memory if never_register has been set
This makes it easier to test the code path that does not use
memory registration (srp_map_sg_dma()).
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 6a5ccd4c..0b576c5 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -70,6 +70,7 @@
static bool allow_ext_sg;
static bool prefer_fr = true;
static bool register_always = true;
+static bool never_register;
static int topspin_workarounds = 1;
module_param(srp_sg_tablesize, uint, 0444);
@@ -99,6 +100,9 @@
MODULE_PARM_DESC(register_always,
"Use memory registration even for contiguous memory regions");
+module_param(never_register, bool, 0444);
+MODULE_PARM_DESC(never_register, "Never register memory");
+
static const struct kernel_param_ops srp_tmo_ops;
static int srp_reconnect_delay = 10;
@@ -3546,9 +3550,10 @@
device->map_phys_fmr && device->unmap_fmr);
srp_dev->has_fr = (device->attrs.device_cap_flags &
IB_DEVICE_MEM_MGT_EXTENSIONS);
- if (!srp_dev->has_fmr && !srp_dev->has_fr) {
+ if (!never_register && !srp_dev->has_fmr && !srp_dev->has_fr) {
dev_warn(&device->dev, "neither FMR nor FR is supported\n");
- } else if (device->attrs.max_mr_size >= 2 * srp_dev->mr_page_size) {
+ } else if (!never_register &&
+ device->attrs.max_mr_size >= 2 * srp_dev->mr_page_size) {
srp_dev->use_fast_reg = (srp_dev->has_fr &&
(!srp_dev->has_fmr || prefer_fr));
srp_dev->use_fmr = !srp_dev->use_fast_reg && srp_dev->has_fmr;
@@ -3573,7 +3578,8 @@
if (IS_ERR(srp_dev->pd))
goto free_dev;
- if (!register_always || (!srp_dev->has_fmr && !srp_dev->has_fr)) {
+ if (never_register || !register_always ||
+ (!srp_dev->has_fmr && !srp_dev->has_fr)) {
srp_dev->global_mr = ib_get_dma_mr(srp_dev->pd,
IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |