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 <[email protected]> --- drivers/infiniband/core/verbs.c | 2 ++ include/rdma/ib_verbs.h | 10 ++++++++++ 2 files changed, 12 insertions(+) diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index e0368fcf5fdb..fd7c93237774 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -1461,6 +1461,8 @@ 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. * diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index c1b5bfa66b84..e487d66be655 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -142,6 +142,10 @@ enum ib_device_cap_flags { IB_DEVICE_ON_DEMAND_PAGING = (1<<31), }; +enum ib_device_cap_flags_ex { + IB_DEVICE_SG_GAPS_REG = (1ULL << 0), +}; + enum ib_signature_prot_cap { IB_PROT_T10DIF_TYPE_1 = 1, IB_PROT_T10DIF_TYPE_2 = 1 << 1, @@ -236,6 +240,7 @@ struct ib_device_attr { struct ib_odp_caps odp_caps; uint64_t timestamp_mask; uint64_t hca_core_clock; /* in KHZ */ + uint64_t device_cap_flags_ex; }; enum ib_mtu { @@ -571,10 +576,15 @@ __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_REG: 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_REG, }; /** -- 1.8.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
