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IB/srp: Introduce the 'register_always' kernel module parameter 

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 <bvanassche@acm.org>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Bart Van Assche 2014-05-20 15:06:41 +02:00 committed by Roland Dreier
parent 539dde6fc5
commit b1b8854d16
1 changed files with 7 additions and 2 deletions
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9
drivers/infiniband/ulp/srp/ib_srp.c
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@ -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