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Commit f5aa9159 authored by Sagi Grimberg's avatar Sagi Grimberg Committed by Doug Ledford
Browse files

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: default avatarSagi Grimberg <sagig@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 911f4331

drivers/infiniband/core/verbs.c

+2 −0
Original line number Diff line number Diff line
@@ -1567,6 +1567,8 @@ EXPORT_SYMBOL(ib_check_mr_status); 
 * - The last sg element is allowed to have length less than page_size.

 * - If sg_nents total byte length exceeds the mr max_num_sge * page_size

 *   then only max_num_sg entries will be mapped.

 * - If the MR was allocated with type IB_MR_TYPE_SG_GAPS_REG, non of these

 *   constraints holds and the page_size argument is ignored.

 *

 * Returns the number of sg elements that were mapped to the memory region.

 *

include/rdma/ib_verbs.h

+6 −0
Original line number Diff line number Diff line
@@ -212,6 +212,7 @@ enum ib_device_cap_flags { 
	IB_DEVICE_MANAGED_FLOW_STEERING		= (1 << 29),

	IB_DEVICE_SIGNATURE_HANDOVER		= (1 << 30),

	IB_DEVICE_ON_DEMAND_PAGING		= (1 << 31),

	IB_DEVICE_SG_GAPS_REG			= (1ULL << 32),

};



enum ib_signature_prot_cap {
@@ -662,10 +663,15 @@ __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate); 
 * @IB_MR_TYPE_SIGNATURE:     memory region that is used for

 *                            signature operations (data-integrity

 *                            capable regions)

 * @IB_MR_TYPE_SG_GAPS:       memory region that is capable to

 *                            register any arbitrary sg lists (without

 *                            the normal mr constraints - see

 *                            ib_map_mr_sg)

 */

enum ib_mr_type {

	IB_MR_TYPE_MEM_REG,

	IB_MR_TYPE_SIGNATURE,

	IB_MR_TYPE_SG_GAPS,

};



/**