Re: [dpdk-dev] Who can correct me about 82599 RSS Hash Function

[chen_lp <chen_lp@neusoft.com>]

Thank you very much.
Depending on your correct, the problem has been resolved.


? 2013?12?12? 23:17, Vladimir Medvedkin ??:
> Hi,
>
> First, I hope you configure
> port_conf->rx_adv_conf.rss_conf.rss_key and .rss_hf
> properly.
> Secondly,
>
> -for(j=0;j<8;j++){
> +for(j=7;j>=0;j--){
>
>
> Regards,
> Vladimir
>
> 2013/12/11 chen_lp@neusoft.com <mailto:chen_lp@neusoft.com> 
> <chen_lp@neusoft.com <mailto:chen_lp@neusoft.com>>
>
>
>     I want calculate the NIC rss hash result by function,but the
>     result is not right, I don't know where the wrong.
>
>
>     struct mbf_cb{
>             uint32_t sip;
>             uint32_t dip;
>             uint16_t sport;
>             uint16_t dport;
>     };
>
>     static uint8_t test_rss[]={
>             0x6d,0x5a,0x56,0xda,0x25,0x5b,0x0e,0xc2,
>             0x41,0x67,0x25,0x3d,0x43,0xa3,0x8f,0xb0,
>             0xd0,0xca,0x2b,0xcb,0xae,0x7b,0x30,0xb4,
>             0x77,0xcb,0x2d,0xa3,0x80,0x30,0xf2,0x0c,
>             0x6a,0x42,0xb7,0x3b,0xbe,0xac,0x01,0xfa,
>     };
>
>     static uint8_t input_mask[]={
>             0x01,0x02,0x04,0x08,
>             0x10,0x20,0x40,0x80,
>     };
>
>      mcb.sip=rte_cpu_to_be_32(IPv4(66,9,149,187));
>       mcb.dip=rte_cpu_to_be_32(IPv4(161,142,100,80));
>        mcb.sport=rte_cpu_to_be_16(2794);
>        mcb.dport=rte_cpu_to_be_16(1766);
>
>
>     uint32_t compute_hash(uint8_t *input, int n)
>     {
>             int i,j,k;
>             uint32_t result=0;
>             uint32_t *lk;
>             uint8_t rss_key[40];
>
>             memcpy(rss_key,test_rss,40);
>
>             lk=(uint32_t *)rss_key;
>             for(i=0;i<n;i++){
>                     for(j=0;j<8;j++){
>     if((input_mask[j])&input[i]){
>                                     result^=*lk;
>                             }
>
>                             // shift k left 1 bit
>     rss_key[0]=rss_key[0]<<1;
>                             for(k=1;k<40;k++){
>     if(rss_key[k]&0x80){
>     rss_key[k-1]|=0x01;
>                                     }
>     rss_key[k]=rss_key[k]<<1;
>                             }
>                     }
>             }
>             return result;
>     }
>
>     printf("rss_hash=%#x\n",compute_hash((uint8_t *)&mcb,sizeof(struct
>     mbf_cb)));
>
>     rss_hash=0x57476eca
>      but the right result is 0x51ccc178
>
>
>
>
>
>
>
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