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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>
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@ -66,6 +66,7 @@ static unsigned int srp_sg_tablesize;
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static unsigned int cmd_sg_entries;
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static unsigned int cmd_sg_entries;
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static unsigned int indirect_sg_entries;
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static unsigned int indirect_sg_entries;
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static bool allow_ext_sg;
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static bool allow_ext_sg;
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static bool register_always;
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static int topspin_workarounds = 1;
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static int topspin_workarounds = 1;
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module_param(srp_sg_tablesize, uint, 0444);
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module_param(srp_sg_tablesize, uint, 0444);
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@ -87,6 +88,10 @@ module_param(topspin_workarounds, int, 0444);
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MODULE_PARM_DESC(topspin_workarounds,
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MODULE_PARM_DESC(topspin_workarounds,
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"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
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"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
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module_param(register_always, bool, 0444);
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MODULE_PARM_DESC(register_always,
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"Use memory registration even for contiguous memory regions");
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static struct kernel_param_ops srp_tmo_ops;
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static struct kernel_param_ops srp_tmo_ops;
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static int srp_reconnect_delay = 10;
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static int srp_reconnect_delay = 10;
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@ -956,7 +961,7 @@ static int srp_finish_mapping(struct srp_map_state *state,
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if (state->npages == 0)
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if (state->npages == 0)
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return 0;
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return 0;
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if (state->npages == 1)
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if (state->npages == 1 && !register_always)
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srp_map_desc(state, state->base_dma_addr, state->fmr_len,
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srp_map_desc(state, state->base_dma_addr, state->fmr_len,
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target->rkey);
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target->rkey);
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else
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else
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@ -1138,7 +1143,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
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fmt = SRP_DATA_DESC_DIRECT;
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fmt = SRP_DATA_DESC_DIRECT;
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len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
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len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
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if (count == 1) {
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if (count == 1 && !register_always) {
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/*
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/*
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* The midlayer only generated a single gather/scatter
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* The midlayer only generated a single gather/scatter
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* entry, or DMA mapping coalesced everything to a
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* entry, or DMA mapping coalesced everything to a
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