* [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping
@ 2021-02-10 8:51 Dan Carpenter
2021-02-10 11:48 ` Leon Romanovsky
2021-02-12 19:23 ` Vlad Buslov
0 siblings, 2 replies; 5+ messages in thread
From: Dan Carpenter @ 2021-02-10 8:51 UTC (permalink / raw)
To: vladbu; +Cc: linux-rdma
Hello Vlad Buslov,
The patch 84ae9c1f29c0: "net/mlx5e: E-Switch, Maintain vhca_id to
vport_num mapping" from Sep 23, 2020, leads to the following static
checker warning:
drivers/net/ethernet/mellanox/mlx5/core/vport.c:1170 mlx5_vport_get_other_func_cap()
warn: odd binop '0x0 & 0x1'
drivers/net/ethernet/mellanox/mlx5/core/vport.c
1168 int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out)
1169 {
1170 u16 opmod = (MLX5_CAP_GENERAL << 1) | (HCA_CAP_OPMOD_GET_MAX & 0x01);
HCA_CAP_OPMOD_GET_MAX is zero. The 0x01 is a magical number.
1171 u8 in[MLX5_ST_SZ_BYTES(query_hca_cap_in)] = {};
1172
1173 MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
1174 MLX5_SET(query_hca_cap_in, in, op_mod, opmod);
1175 MLX5_SET(query_hca_cap_in, in, function_id, function_id);
1176 MLX5_SET(query_hca_cap_in, in, other_function, true);
1177 return mlx5_cmd_exec_inout(dev, query_hca_cap, in, out);
1178 }
regards,
dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping
2021-02-10 8:51 [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping Dan Carpenter
@ 2021-02-10 11:48 ` Leon Romanovsky
2021-02-10 12:28 ` Dan Carpenter
2021-02-12 19:23 ` Vlad Buslov
1 sibling, 1 reply; 5+ messages in thread
From: Leon Romanovsky @ 2021-02-10 11:48 UTC (permalink / raw)
To: Dan Carpenter; +Cc: vladbu, linux-rdma, linux-netdev
On Wed, Feb 10, 2021 at 11:51:51AM +0300, Dan Carpenter wrote:
> Hello Vlad Buslov,
>
> The patch 84ae9c1f29c0: "net/mlx5e: E-Switch, Maintain vhca_id to
> vport_num mapping" from Sep 23, 2020, leads to the following static
> checker warning:
>
> drivers/net/ethernet/mellanox/mlx5/core/vport.c:1170 mlx5_vport_get_other_func_cap()
> warn: odd binop '0x0 & 0x1'
>
> drivers/net/ethernet/mellanox/mlx5/core/vport.c
> 1168 int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out)
> 1169 {
> 1170 u16 opmod = (MLX5_CAP_GENERAL << 1) | (HCA_CAP_OPMOD_GET_MAX & 0x01);
>
> HCA_CAP_OPMOD_GET_MAX is zero. The 0x01 is a magical number.
>
> 1171 u8 in[MLX5_ST_SZ_BYTES(query_hca_cap_in)] = {};
> 1172
> 1173 MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
> 1174 MLX5_SET(query_hca_cap_in, in, op_mod, opmod);
> 1175 MLX5_SET(query_hca_cap_in, in, function_id, function_id);
> 1176 MLX5_SET(query_hca_cap_in, in, other_function, true);
> 1177 return mlx5_cmd_exec_inout(dev, query_hca_cap, in, out);
> 1178 }
Dan,
I'm running smatch which is based on 6193b3b71beb ("extra: fix some error pointer handling")
and I don't see this error. Should I run something special?
Thanks
>
> regards,
> dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping
2021-02-10 11:48 ` Leon Romanovsky
@ 2021-02-10 12:28 ` Dan Carpenter
2021-02-10 14:43 ` Leon Romanovsky
0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2021-02-10 12:28 UTC (permalink / raw)
To: Leon Romanovsky; +Cc: vladbu, linux-rdma, linux-netdev
On Wed, Feb 10, 2021 at 01:48:20PM +0200, Leon Romanovsky wrote:
> On Wed, Feb 10, 2021 at 11:51:51AM +0300, Dan Carpenter wrote:
> > Hello Vlad Buslov,
> >
> > The patch 84ae9c1f29c0: "net/mlx5e: E-Switch, Maintain vhca_id to
> > vport_num mapping" from Sep 23, 2020, leads to the following static
> > checker warning:
> >
> > drivers/net/ethernet/mellanox/mlx5/core/vport.c:1170 mlx5_vport_get_other_func_cap()
> > warn: odd binop '0x0 & 0x1'
> >
> > drivers/net/ethernet/mellanox/mlx5/core/vport.c
> > 1168 int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out)
> > 1169 {
> > 1170 u16 opmod = (MLX5_CAP_GENERAL << 1) | (HCA_CAP_OPMOD_GET_MAX & 0x01);
> >
> > HCA_CAP_OPMOD_GET_MAX is zero. The 0x01 is a magical number.
> >
> > 1171 u8 in[MLX5_ST_SZ_BYTES(query_hca_cap_in)] = {};
> > 1172
> > 1173 MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
> > 1174 MLX5_SET(query_hca_cap_in, in, op_mod, opmod);
> > 1175 MLX5_SET(query_hca_cap_in, in, function_id, function_id);
> > 1176 MLX5_SET(query_hca_cap_in, in, other_function, true);
> > 1177 return mlx5_cmd_exec_inout(dev, query_hca_cap, in, out);
> > 1178 }
>
> Dan,
>
> I'm running smatch which is based on 6193b3b71beb ("extra: fix some error pointer handling")
> and I don't see this error. Should I run something special?
>
This check is too crap to publish.
The heuristic was "a bitwise AND which always results in zero" but a lot
of code does stuff like: "data = 0x00 << 0 | 0x04 << 8 | 0x12 << 16;"
I could never figure out a way to make the check useful enough to
publish.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping
2021-02-10 12:28 ` Dan Carpenter
@ 2021-02-10 14:43 ` Leon Romanovsky
0 siblings, 0 replies; 5+ messages in thread
From: Leon Romanovsky @ 2021-02-10 14:43 UTC (permalink / raw)
To: Dan Carpenter; +Cc: vladbu, linux-rdma, linux-netdev
On Wed, Feb 10, 2021 at 03:28:01PM +0300, Dan Carpenter wrote:
> On Wed, Feb 10, 2021 at 01:48:20PM +0200, Leon Romanovsky wrote:
> > On Wed, Feb 10, 2021 at 11:51:51AM +0300, Dan Carpenter wrote:
> > > Hello Vlad Buslov,
> > >
> > > The patch 84ae9c1f29c0: "net/mlx5e: E-Switch, Maintain vhca_id to
> > > vport_num mapping" from Sep 23, 2020, leads to the following static
> > > checker warning:
> > >
> > > drivers/net/ethernet/mellanox/mlx5/core/vport.c:1170 mlx5_vport_get_other_func_cap()
> > > warn: odd binop '0x0 & 0x1'
> > >
> > > drivers/net/ethernet/mellanox/mlx5/core/vport.c
> > > 1168 int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out)
> > > 1169 {
> > > 1170 u16 opmod = (MLX5_CAP_GENERAL << 1) | (HCA_CAP_OPMOD_GET_MAX & 0x01);
> > >
> > > HCA_CAP_OPMOD_GET_MAX is zero. The 0x01 is a magical number.
> > >
> > > 1171 u8 in[MLX5_ST_SZ_BYTES(query_hca_cap_in)] = {};
> > > 1172
> > > 1173 MLX5_SET(query_hca_cap_in, in, opcode, MLX5_CMD_OP_QUERY_HCA_CAP);
> > > 1174 MLX5_SET(query_hca_cap_in, in, op_mod, opmod);
> > > 1175 MLX5_SET(query_hca_cap_in, in, function_id, function_id);
> > > 1176 MLX5_SET(query_hca_cap_in, in, other_function, true);
> > > 1177 return mlx5_cmd_exec_inout(dev, query_hca_cap, in, out);
> > > 1178 }
> >
> > Dan,
> >
> > I'm running smatch which is based on 6193b3b71beb ("extra: fix some error pointer handling")
> > and I don't see this error. Should I run something special?
> >
>
> This check is too crap to publish.
>
> The heuristic was "a bitwise AND which always results in zero" but a lot
> of code does stuff like: "data = 0x00 << 0 | 0x04 << 8 | 0x12 << 16;"
> I could never figure out a way to make the check useful enough to
> publish.
But you can warn about simple cases like above, which is constant zero
AND something.
Thanks
>
> regards,
> dan carpenter
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping
2021-02-10 8:51 [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping Dan Carpenter
2021-02-10 11:48 ` Leon Romanovsky
@ 2021-02-12 19:23 ` Vlad Buslov
1 sibling, 0 replies; 5+ messages in thread
From: Vlad Buslov @ 2021-02-12 19:23 UTC (permalink / raw)
To: Dan Carpenter; +Cc: linux-rdma, Saeed Mahameed
On Wed 10 Feb 2021 at 10:51, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> Hello Vlad Buslov,
>
> The patch 84ae9c1f29c0: "net/mlx5e: E-Switch, Maintain vhca_id to
> vport_num mapping" from Sep 23, 2020, leads to the following static
> checker warning:
>
> drivers/net/ethernet/mellanox/mlx5/core/vport.c:1170 mlx5_vport_get_other_func_cap()
> warn: odd binop '0x0 & 0x1'
>
> drivers/net/ethernet/mellanox/mlx5/core/vport.c
> 1168 int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out)
> 1169 {
> 1170 u16 opmod = (MLX5_CAP_GENERAL << 1) | (HCA_CAP_OPMOD_GET_MAX & 0x01);
>
> HCA_CAP_OPMOD_GET_MAX is zero. The 0x01 is a magical number.
Hi Dan,
Thanks for reporting and sorry for the late reply. Adding Saeed, we will
handle the issue.
Regards,
Vlad
[...]
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-02-12 19:25 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2021-02-10 8:51 [bug report] net/mlx5e: E-Switch, Maintain vhca_id to vport_num mapping Dan Carpenter
2021-02-10 11:48 ` Leon Romanovsky
2021-02-10 12:28 ` Dan Carpenter
2021-02-10 14:43 ` Leon Romanovsky
2021-02-12 19:23 ` Vlad Buslov
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