netdev - Re: [PATCH net-next v2 04/15] idpf: add core init and interrupt request

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Date:   Thu, 13 Apr 2023 12:10:01 -0700
From:   "Tantilov, Emil S" <emil.s.tantilov@...el.com>
To:     Simon Horman <simon.horman@...igine.com>,
        Pavan Kumar Linga <pavan.kumar.linga@...el.com>
CC:     <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
        <joshua.a.hay@...el.com>, <sridhar.samudrala@...el.com>,
        <jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
        <willemb@...gle.com>, <decot@...gle.com>, <pabeni@...hat.com>,
        <kuba@...nel.org>, <edumazet@...gle.com>, <davem@...emloft.net>,
        Alan Brady <alan.brady@...el.com>,
        Madhu Chittim <madhu.chittim@...el.com>,
        Phani Burra <phani.r.burra@...el.com>,
        Shailendra Bhatnagar <shailendra.bhatnagar@...el.com>
Subject: Re: [PATCH net-next v2 04/15] idpf: add core init and interrupt
 request



On 4/11/2023 2:52 AM, Simon Horman wrote:
> On Mon, Apr 10, 2023 at 06:13:43PM -0700, Pavan Kumar Linga wrote:
> 
> ...
> 
>> diff --git a/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c b/drivers/net/ethernet/intel/idpf/idpf_virtchnl.c
> 
> ...
> 
>> +/**
>> + * idpf_recv_get_caps_msg - Receive virtchnl get capabilities message
>> + * @adapter: Driver specific private structure
>> + *
>> + * Receive virtchnl get capabilities message. Returns 0 on success, negative on
>> + * failure.
>> + */
>> +static int idpf_recv_get_caps_msg(struct idpf_adapter *adapter)
>> +{
>> +	return idpf_recv_mb_msg(adapter, VIRTCHNL2_OP_GET_CAPS, &adapter->caps,
>> +				sizeof(struct virtchnl2_get_capabilities));
>> +}
>> +
>> +/**
>> + * idpf_send_alloc_vectors_msg - Send virtchnl alloc vectors message
>> + * @adapter: Driver specific private structure
>> + * @num_vectors: number of vectors to be allocated
>> + *
>> + * Returns 0 on success, negative on failure.
>> + */
>> +int idpf_send_alloc_vectors_msg(struct idpf_adapter *adapter, u16 num_vectors)
>> +{
>> +	struct virtchnl2_alloc_vectors *alloc_vec, *rcvd_vec;
>> +	struct virtchnl2_alloc_vectors ac = { };
>> +	u16 num_vchunks;
>> +	int size, err;
>> +
>> +	ac.num_vectors = cpu_to_le16(num_vectors);
>> +
>> +	err = idpf_send_mb_msg(adapter, VIRTCHNL2_OP_ALLOC_VECTORS,
>> +			       sizeof(ac), (u8 *)&ac);
>> +	if (err)
>> +		return err;
>> +
>> +	err = idpf_wait_for_event(adapter, NULL, IDPF_VC_ALLOC_VECTORS,
>> +				  IDPF_VC_ALLOC_VECTORS_ERR);
>> +	if (err)
>> +		return err;
>> +
>> +	rcvd_vec = (struct virtchnl2_alloc_vectors *)adapter->vc_msg;
>> +	num_vchunks = le16_to_cpu(rcvd_vec->vchunks.num_vchunks);
>> +
>> +	size = struct_size(rcvd_vec, vchunks.vchunks, num_vchunks);
>> +	if (size > sizeof(adapter->vc_msg)) {
>> +		err = -EINVAL;
>> +		goto error;
>> +	}
>> +
>> +	kfree(adapter->req_vec_chunks);
>> +	adapter->req_vec_chunks = NULL;
>> +	adapter->req_vec_chunks = kzalloc(size, GFP_KERNEL);
>> +	if (!adapter->req_vec_chunks) {
>> +		err = -ENOMEM;
>> +		goto error;
>> +	}
>> +	memcpy(adapter->req_vec_chunks, adapter->vc_msg, size);
> 
> Hi Pavan,
> 
> Coccinelle suggests that kmemdup might be used here.
> 
> drivers/net/ethernet/intel/idpf/idpf_virtchnl.c:2085:27-34: WARNING opportunity for kmemdup
> 
> Likewise for a similar pattern in:
> * [PATCH net-next v2 14/15] idpf: add ethtool callbacks
> 
> ...

We'll address it in v3.

Thanks,
Emil