There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].
Refactor the code according to the use of a flexible-array member in struct
virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element array,
and use the flex_array_size() helper.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
drivers/net/ethernet/intel/iavf/iavf_client.c | 2 +-
drivers/net/ethernet/intel/iavf/iavf_client.h | 2 +-
include/linux/avf/virtchnl.h | 8 ++++----
4 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index c0afac8cf33b..6c55fe9cc132 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -515,7 +515,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
kfree(vf->qvlist_info);
vf->qvlist_info = kzalloc(struct_size(vf->qvlist_info, qv_info,
- qvlist_info->num_vectors - 1),
+ qvlist_info->num_vectors),
GFP_KERNEL);
if (!vf->qvlist_info) {
ret = -ENOMEM;
diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.c b/drivers/net/ethernet/intel/iavf/iavf_client.c
index 0c77e4171808..e70da05ef322 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_client.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_client.c
@@ -470,7 +470,7 @@ static int iavf_client_setup_qvlist(struct iavf_info *ldev,
v_qvlist_info = (struct virtchnl_iwarp_qvlist_info *)qvlist_info;
msg_size = struct_size(v_qvlist_info, qv_info,
- v_qvlist_info->num_vectors - 1);
+ v_qvlist_info->num_vectors);
adapter->client_pending |= BIT(VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP);
err = iavf_aq_send_msg_to_pf(&adapter->hw,
diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.h b/drivers/net/ethernet/intel/iavf/iavf_client.h
index 9a7cf39ea75a..b14a82b65626 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_client.h
+++ b/drivers/net/ethernet/intel/iavf/iavf_client.h
@@ -53,7 +53,7 @@ struct iavf_qv_info {
struct iavf_qvlist_info {
u32 num_vectors;
- struct iavf_qv_info qv_info[1];
+ struct iavf_qv_info qv_info[];
};
#define IAVF_CLIENT_MSIX_ALL 0xFFFFFFFF
diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
index 85a687bc6096..15b982911321 100644
--- a/include/linux/avf/virtchnl.h
+++ b/include/linux/avf/virtchnl.h
@@ -658,10 +658,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
struct virtchnl_iwarp_qvlist_info {
u32 num_vectors;
- struct virtchnl_iwarp_qv_info qv_info[1];
+ struct virtchnl_iwarp_qv_info qv_info[];
};
-VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
+VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_iwarp_qvlist_info);
/* VF reset states - these are written into the RSTAT register:
* VFGEN_RSTAT on the VF
@@ -1069,8 +1069,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
err_msg_format = true;
break;
}
- valid_len += ((qv->num_vectors - 1) *
- sizeof(struct virtchnl_iwarp_qv_info));
+ valid_len += flex_array_size(qv, qv_info,
+ qv->num_vectors);
}
break;
case VIRTCHNL_OP_CONFIG_RSS_KEY:
--
2.27.0
Hi all,
Friendly ping (after more than a year after I sent this patch :O):
Who can review and/or take this patch, please?
Thanks
--
Gustavo
On 5/26/21 01:04, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare having a
> dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
>
> Refactor the code according to the use of a flexible-array member in struct
> virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element array,
> and use the flex_array_size() helper.
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/79
> Signed-off-by: Gustavo A. R. Silva <[email protected]>
> ---
> drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
> drivers/net/ethernet/intel/iavf/iavf_client.c | 2 +-
> drivers/net/ethernet/intel/iavf/iavf_client.h | 2 +-
> include/linux/avf/virtchnl.h | 8 ++++----
> 4 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index c0afac8cf33b..6c55fe9cc132 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -515,7 +515,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
>
> kfree(vf->qvlist_info);
> vf->qvlist_info = kzalloc(struct_size(vf->qvlist_info, qv_info,
> - qvlist_info->num_vectors - 1),
> + qvlist_info->num_vectors),
> GFP_KERNEL);
> if (!vf->qvlist_info) {
> ret = -ENOMEM;
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.c b/drivers/net/ethernet/intel/iavf/iavf_client.c
> index 0c77e4171808..e70da05ef322 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_client.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_client.c
> @@ -470,7 +470,7 @@ static int iavf_client_setup_qvlist(struct iavf_info *ldev,
>
> v_qvlist_info = (struct virtchnl_iwarp_qvlist_info *)qvlist_info;
> msg_size = struct_size(v_qvlist_info, qv_info,
> - v_qvlist_info->num_vectors - 1);
> + v_qvlist_info->num_vectors);
>
> adapter->client_pending |= BIT(VIRTCHNL_OP_CONFIG_IWARP_IRQ_MAP);
> err = iavf_aq_send_msg_to_pf(&adapter->hw,
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_client.h b/drivers/net/ethernet/intel/iavf/iavf_client.h
> index 9a7cf39ea75a..b14a82b65626 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_client.h
> +++ b/drivers/net/ethernet/intel/iavf/iavf_client.h
> @@ -53,7 +53,7 @@ struct iavf_qv_info {
>
> struct iavf_qvlist_info {
> u32 num_vectors;
> - struct iavf_qv_info qv_info[1];
> + struct iavf_qv_info qv_info[];
> };
>
> #define IAVF_CLIENT_MSIX_ALL 0xFFFFFFFF
> diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h
> index 85a687bc6096..15b982911321 100644
> --- a/include/linux/avf/virtchnl.h
> +++ b/include/linux/avf/virtchnl.h
> @@ -658,10 +658,10 @@ VIRTCHNL_CHECK_STRUCT_LEN(12, virtchnl_iwarp_qv_info);
>
> struct virtchnl_iwarp_qvlist_info {
> u32 num_vectors;
> - struct virtchnl_iwarp_qv_info qv_info[1];
> + struct virtchnl_iwarp_qv_info qv_info[];
> };
>
> -VIRTCHNL_CHECK_STRUCT_LEN(16, virtchnl_iwarp_qvlist_info);
> +VIRTCHNL_CHECK_STRUCT_LEN(4, virtchnl_iwarp_qvlist_info);
>
> /* VF reset states - these are written into the RSTAT register:
> * VFGEN_RSTAT on the VF
> @@ -1069,8 +1069,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode,
> err_msg_format = true;
> break;
> }
> - valid_len += ((qv->num_vectors - 1) *
> - sizeof(struct virtchnl_iwarp_qv_info));
> + valid_len += flex_array_size(qv, qv_info,
> + qv->num_vectors);
> }
> break;
> case VIRTCHNL_OP_CONFIG_RSS_KEY:
On 6/17/2022 9:00 AM, Gustavo A. R. Silva wrote:
> Hi all,
>
> Friendly ping (after more than a year after I sent this patch :O):
>
> Who can review and/or take this patch, please?
Hi Gustavo,
IIRC this could cause some issues with the expectations of the virtchnl
structures [1] for compatibility. There was a direction that we were
going to head to resolve this. Unfortunately, the person who, I believe,
was going to make this change is out for a couple of weeks. I will ask
around and see if I can get any updates on this work. Otherwise, I'll
ask him when he returns.
Thanks,
Tony
[1]
https://lore.kernel.org/intel-wired-lan/[email protected]/
> Thanks
> --
> Gustavo
>
> On 5/26/21 01:04, Gustavo A. R. Silva wrote:
>> There is a regular need in the kernel to provide a way to declare
>> having a
>> dynamically sized set of trailing elements in a structure. Kernel code
>> should always use “flexible array members”[1] for these cases. The older
>> style of one-element or zero-length arrays should no longer be used[2].
>>
>> Refactor the code according to the use of a flexible-array member in
>> struct
>> virtchnl_iwarp_qvlist_info and iavf_qvlist_info instead of one-element
>> array,
>> and use the flex_array_size() helper.
>>
>> [1] https://en.wikipedia.org/wiki/Flexible_array_member
>> [2]
>> https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
>>
>>
>> Link: https://github.com/KSPP/linux/issues/79
>> Signed-off-by: Gustavo A. R. Silva <[email protected]>
>