Add a kernel module parameter that enables memory registration also for SG-lists
that can be processed without memory registration. This makes it easier for
kernel
developers to test the memory registration code.
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
Cc: Roland Dreier <rol...@purestorage.com>
Cc: David Dillow <d...@thedillows.org>
Cc: Sagi Grimberg <sa...@mellanox.com>
Cc: Vu Pham <v...@mellanox.com>
Cc: Sebastian Parschauer <sebastian.rie...@profitbricks.com>
---
drivers/infiniband/ulp/srp/ib_srp.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c
b/drivers/infiniband/ulp/srp/ib_srp.c
index c2e0ad3..77ba965 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -66,6 +66,7 @@ static unsigned int srp_sg_tablesize;
static unsigned int cmd_sg_entries;
static unsigned int indirect_sg_entries;
static bool allow_ext_sg;
+static bool register_always;
static int topspin_workarounds = 1;
module_param(srp_sg_tablesize, uint, 0444);
@@ -87,6 +88,10 @@ module_param(topspin_workarounds, int, 0444);
MODULE_PARM_DESC(topspin_workarounds,
"Enable workarounds for Topspin/Cisco SRP target bugs if !=
0");
+module_param(register_always, bool, 0444);
+MODULE_PARM_DESC(register_always,
+ "Use memory registration even for contiguous memory regions");
+
static struct kernel_param_ops srp_tmo_ops;
static int srp_reconnect_delay = 10;
@@ -956,7 +961,7 @@ static int srp_finish_mapping(struct srp_map_state *state,
if (state->npages == 0)
return 0;
- if (state->npages == 1)
+ if (state->npages == 1 && !register_always)
srp_map_desc(state, state->base_dma_addr, state->fmr_len,
target->rkey);
else
@@ -1138,7 +1143,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct
srp_target_port *target,
fmt = SRP_DATA_DESC_DIRECT;
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
- if (count == 1) {
+ if (count == 1 && !register_always) {
/*
* The midlayer only generated a single gather/scatter
* entry, or DMA mapping coalesced everything to a
--
1.8.4.5
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