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Commit b1b8854d authored by Bart Van Assche's avatar Bart Van Assche Committed by Roland Dreier
Browse files

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: default avatarBart Van Assche <bvanassche@acm.org>
Reviewed-by: default avatarSagi Grimberg <sagig@mellanox.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent 539dde6f

drivers/infiniband/ulp/srp/ib_srp.c

+7 −2
Original line number Diff line number Diff line
@@ -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