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

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

[chen_lp]

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

[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 <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
>
>
>
>
>
>
>
>
> ---------------------------------------------------------------------------------------------------
> Confidentiality Notice: The information contained in this e-mail and any
> accompanying attachment(s)
> is intended only for the use of the intended recipient and may be
> confidential and/or privileged of
> Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader
> of this communication is
> not the intended recipient, unauthorized use, forwarding, printing,
>  storing, disclosure or copying
> is strictly prohibited, and may be unlawful.If you have received this
> communication in error,please
> immediately notify the sender by return e-mail, and delete the original
> message and all copies from
> your system. Thank you.
>
> ---------------------------------------------------------------------------------------------------
>

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

[chen_lp]

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
>
>
>
>
>
>
>
>     ---------------------------------------------------------------------------------------------------
>     Confidentiality Notice: The information contained in this e-mail
>     and any accompanying attachment(s)
>     is intended only for the use of the intended recipient and may be
>     confidential and/or privileged of
>     Neusoft Corporation, its subsidiaries and/or its affiliates. If
>     any reader of this communication is
>     not the intended recipient, unauthorized use, forwarding,
>     printing,  storing, disclosure or copying
>     is strictly prohibited, and may be unlawful.If you have received
>     this communication in error,please
>     immediately notify the sender by return e-mail, and delete the
>     original message and all copies from
>     your system. Thank you.
>     ---------------------------------------------------------------------------------------------------
>
>

---------------------------------------------------------------------------------------------------
Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) 
is intended only for the use of the intended recipient and may be confidential and/or privileged of 
Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is 
not the intended recipient, unauthorized use, forwarding, printing,  storing, disclosure or copying 
is strictly prohibited, and may be unlawful.If you have received this communication in error,please 
immediately notify the sender by return e-mail, and delete the original message and all copies from 
your system. Thank you. 
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