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authorSagi Grimberg <sagig@mellanox.com>2016-02-29 20:07:32 +0300
committerDoug Ledford <dledford@redhat.com>2016-03-04 19:59:34 +0300
commitf5aa9159a418726d74b67c8815ffd2739afb4c7a (patch)
tree2205e3e00c4200279cd467f787c7aaae0204a5fd /drivers/infiniband/core
parent911f4331bc87f4589b9096f4fb24b335d4c2967d (diff)
downloadlinux-f5aa9159a418726d74b67c8815ffd2739afb4c7a.tar.xz
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>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/verbs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 5af6d024e053..16f3fb1b9d75 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -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.
*