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SubjectRe: [PATCH net-next 11/12] net: hns3: do not allocate linear data for fraglist skb
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On 2019/10/17 1:18, Jakub Kicinski wrote:
> On Wed, 16 Oct 2019 15:17:10 +0800, Huazhong Tan wrote:
>> From: Yunsheng Lin <linyunsheng@huawei.com>
>>
>> Currently, napi_alloc_skb() is used to allocate skb for fraglist
>> when the head skb is not enough to hold the remaining data, and
>> the remaining data is added to the frags part of the fraglist skb,
>> leaving the linear part unused.
>>
>> So this patch passes length of 0 to allocate fraglist skb with
>> zero size of linear data.
>>
>> Fixes: 81ae0e0491f3 ("net: hns3: Add skb chain when num of RX buf exceeds MAX_SKB_FRAGS")
>> Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
>> Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
>
> Is this really a fix? I just wastes memory, right?

It is a minor optimizations. This fix tag is a mistake.
Thanks.

>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>> index 6172eb2..14111af 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
>> @@ -2866,8 +2866,7 @@ static int hns3_add_frag(struct hns3_enet_ring *ring, struct hns3_desc *desc,
>> return -ENXIO;
>>
>> if (unlikely(ring->frag_num >= MAX_SKB_FRAGS)) {
>> - new_skb = napi_alloc_skb(&ring->tqp_vector->napi,
>> - HNS3_RX_HEAD_SIZE);
>> + new_skb = napi_alloc_skb(&ring->tqp_vector->napi, 0);
>> if (unlikely(!new_skb)) {
>> hns3_rl_err(ring_to_netdev(ring),
>> "alloc rx fraglist skb fail\n");
>
>
> .
>

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