IB/core: Add arbitrary sg_list support
Devices that are capable in registering SG lists with gaps can now expose it in the core to ULPs using a new device capability IB_DEVICE_SG_GAPS_REG (in a new field device_cap_flags_ex in the device attributes as we ran out of bits), and a new mr_type IB_MR_TYPE_SG_GAPS_REG which allocates a memory region which is capable of handling SG lists with gaps. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -1567,6 +1567,8 @@ EXPORT_SYMBOL(ib_check_mr_status);
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* - The last sg element is allowed to have length less than page_size.
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* - If sg_nents total byte length exceeds the mr max_num_sge * page_size
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* then only max_num_sg entries will be mapped.
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* - If the MR was allocated with type IB_MR_TYPE_SG_GAPS_REG, non of these
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* constraints holds and the page_size argument is ignored.
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*
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* Returns the number of sg elements that were mapped to the memory region.
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*
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@ -212,6 +212,7 @@ enum ib_device_cap_flags {
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IB_DEVICE_MANAGED_FLOW_STEERING = (1 << 29),
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IB_DEVICE_SIGNATURE_HANDOVER = (1 << 30),
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IB_DEVICE_ON_DEMAND_PAGING = (1 << 31),
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IB_DEVICE_SG_GAPS_REG = (1ULL << 32),
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};
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enum ib_signature_prot_cap {
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@ -662,10 +663,15 @@ __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate);
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* @IB_MR_TYPE_SIGNATURE: memory region that is used for
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* signature operations (data-integrity
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* capable regions)
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* @IB_MR_TYPE_SG_GAPS: memory region that is capable to
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* register any arbitrary sg lists (without
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* the normal mr constraints - see
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* ib_map_mr_sg)
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*/
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enum ib_mr_type {
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IB_MR_TYPE_MEM_REG,
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IB_MR_TYPE_SIGNATURE,
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IB_MR_TYPE_SG_GAPS,
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};
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/**
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