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RDMA/mlx5: Rewrite MAD processing logic to be readable 

Multiple "if"s and "||" make extension of process_mad() function
as a tedious task, rewrite that function to be more readable.

Link: https://lore.kernel.org/r/20191029062745.7932-14-leon@kernel.org
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2019-10-29 08:27:42 +02:00 committed by Jason Gunthorpe
parent 84b56d57cf
commit ffa2fd1323
1 changed files with 55 additions and 61 deletions
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114
drivers/infiniband/hw/mlx5/mad.c
View File

@ -74,58 +74,6 @@ static int mlx5_MAD_IFC(struct mlx5_ib_dev *dev, int ignore_mkey,
port);
}
static int process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
const struct ib_wc *in_wc, const struct ib_grh *in_grh,
const struct ib_mad *in_mad, struct ib_mad *out_mad)
{
u16 slid;
int err;
slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0)
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_TRAP_REPRESS)
return IB_MAD_RESULT_SUCCESS;
/* Don't process SMInfo queries -- the SMA can't handle them.
*/
if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
return IB_MAD_RESULT_SUCCESS;
} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS1 ||
in_mad->mad_hdr.mgmt_class == MLX5_IB_VENDOR_CLASS2 ||
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
if (in_mad->mad_hdr.method != IB_MGMT_METHOD_GET &&
in_mad->mad_hdr.method != IB_MGMT_METHOD_SET)
return IB_MAD_RESULT_SUCCESS;
} else {
return IB_MAD_RESULT_SUCCESS;
}
err = mlx5_MAD_IFC(to_mdev(ibdev),
mad_flags & IB_MAD_IGNORE_MKEY,
mad_flags & IB_MAD_IGNORE_BKEY,
port_num, in_wc, in_grh, in_mad, out_mad);
if (err)
return IB_MAD_RESULT_FAILURE;
/* set return bit in status of directed route responses */
if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
/* no response for trap repress */
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}
static void pma_cnt_ext_assign(struct ib_pma_portcounters_ext *pma_cnt_ext,
void *out)
{
@ -278,17 +226,63 @@ int mlx5_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
struct mlx5_ib_dev *dev = to_mdev(ibdev);
const struct ib_mad *in_mad = (const struct ib_mad *)in;
struct ib_mad *out_mad = (struct ib_mad *)out;
int ret;
u8 mgmt_class = in_mad->mad_hdr.mgmt_class;
u8 method = in_mad->mad_hdr.method;
u16 slid;
int err;
slid = in_wc ? ib_lid_cpu16(in_wc->slid) :
be16_to_cpu(IB_LID_PERMISSIVE);
if (method == IB_MGMT_METHOD_TRAP && !slid)
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
switch (mgmt_class) {
case IB_MGMT_CLASS_SUBN_LID_ROUTED:
case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE: {
if (method != IB_MGMT_METHOD_GET &&
method != IB_MGMT_METHOD_SET &&
method != IB_MGMT_METHOD_TRAP_REPRESS)
return IB_MAD_RESULT_SUCCESS;
/* Don't process SMInfo queries -- the SMA can't handle them.
*/
if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
return IB_MAD_RESULT_SUCCESS;
} break;
case IB_MGMT_CLASS_PERF_MGMT:
if (MLX5_CAP_GEN(dev->mdev, vport_counters) &&
in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT &&
in_mad->mad_hdr.method == IB_MGMT_METHOD_GET) {
ret = process_pma_cmd(dev, port_num, in_mad, out_mad);
} else {
ret = process_mad(ibdev, mad_flags, port_num, in_wc, in_grh,
in_mad, out_mad);
method == IB_MGMT_METHOD_GET)
return process_pma_cmd(dev, port_num, in_mad, out_mad);
/* fallthrough */
case MLX5_IB_VENDOR_CLASS1:
/* fallthrough */
case MLX5_IB_VENDOR_CLASS2:
case IB_MGMT_CLASS_CONG_MGMT: {
if (method != IB_MGMT_METHOD_GET &&
method != IB_MGMT_METHOD_SET)
return IB_MAD_RESULT_SUCCESS;
} break;
default:
return IB_MAD_RESULT_SUCCESS;
}
return ret;
err = mlx5_MAD_IFC(to_mdev(ibdev),
mad_flags & IB_MAD_IGNORE_MKEY,
mad_flags & IB_MAD_IGNORE_BKEY,
port_num, in_wc, in_grh, in_mad, out_mad);
if (err)
return IB_MAD_RESULT_FAILURE;
/* set return bit in status of directed route responses */
if (mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
if (method == IB_MGMT_METHOD_TRAP_REPRESS)
/* no response for trap repress */
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
}
int mlx5_query_ext_port_caps(struct mlx5_ib_dev *dev, u8 port)