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IB/core: Add don't trap flag to flow creation

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Don't trap flag (i.e. IB_FLOW_ATTR_FLAGS_DONT_TRAP) indicates that QP
will receive traffic, but will not steal it.

When a packet matches a flow steering rule that was created with
the don't trap flag, the QPs assigned to this rule will get this
packet, but matching will continue to other equal/lower priority
rules. This will let other QPs assigned to those rules to get the
packet too.

If both don't trap rule and other rules have the same priority
and match the same packet, the behavior is undefined.

The don't trap flag can't be set with default rule types
(i.e. IB_FLOW_ATTR_ALL_DEFAULT, IB_FLOW_ATTR_MC_DEFAULT) as default rules
don't have rules after them and don't trap has no meaning here.

Signed-off-by: Marina Varshaver <marinav@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Marina Varshaver 2016-02-18 18:31:05 +02:00 committed by Doug Ledford
parent 571e09eeff
commit a3100a7879
3 changed files with 16 additions and 0 deletions
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8
drivers/infiniband/core/uverbs_cmd.c
View File

@ -3085,6 +3085,14 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
!capable(CAP_NET_ADMIN)) || !capable(CAP_NET_RAW))
return -EPERM;
if (cmd.flow_attr.flags >= IB_FLOW_ATTR_FLAGS_RESERVED)
return -EINVAL;
if ((cmd.flow_attr.flags & IB_FLOW_ATTR_FLAGS_DONT_TRAP) &&
((cmd.flow_attr.type == IB_FLOW_ATTR_ALL_DEFAULT) ||
(cmd.flow_attr.type == IB_FLOW_ATTR_MC_DEFAULT)))
return -EINVAL;
if (cmd.flow_attr.num_of_specs > IB_FLOW_SPEC_SUPPORT_LAYERS)
return -EINVAL;

3
drivers/infiniband/hw/mlx4/main.c
View File

@ -1653,6 +1653,9 @@ static struct ib_flow *mlx4_ib_create_flow(struct ib_qp *qp,
struct mlx4_dev *dev = (to_mdev(qp->device))->dev;
int is_bonded = mlx4_is_bonded(dev);
if (flow_attr->flags & IB_FLOW_ATTR_FLAGS_DONT_TRAP)
return ERR_PTR(-EOPNOTSUPP);
memset(type, 0, sizeof(type));
mflow = kzalloc(sizeof(*mflow), GFP_KERNEL);

5
include/rdma/ib_verbs.h
View File

@ -1487,6 +1487,11 @@ enum ib_flow_domain {
IB_FLOW_DOMAIN_NUM /* Must be last */
};
enum ib_flow_flags {
IB_FLOW_ATTR_FLAGS_DONT_TRAP = 1UL << 1, /* Continue match, no steal */
IB_FLOW_ATTR_FLAGS_RESERVED = 1UL << 2 /* Must be last */
};
struct ib_flow_eth_filter {
u8 dst_mac[6];
u8 src_mac[6];