CC3220S: Cannot receive IPv6 Multicast packets in bypass mode

Stanislav Andrianov

Part Number: CC3220S

Hi,

We have a special setup for CC3220 that is working in network bypass mode ipv6 only. I am able to send and receive RAW packets.

However I cannot receive multicast Router advertisement messages (i verified that they are indeed being multicast to ff02::1 trough wireshark)

Thanks

over 4 years ago

0 Jesu over 4 years ago

TI__Mastermind 22935 points

Hello,

Are you using RX filters? Also, could you receive other ipv6 packets or is it just router advertisements messages?

Jesu

0 Stanislav Andrianov over 4 years ago in reply to Jesu

Prodigy 40 points

I assume this code bellow would disable the filters

static void WIFIDisableInternalFilter(void)
{
    SlWlanRxFilterOperationCommandBuff_t filterBitmap = {
        {0}
    };
    uint16_t ConfigOpt = SL_WLAN_RX_FILTER_STATE;
    uint16_t ConfigSize = 0;

    ConfigSize = sizeof(SlWlanRxFilterRetrieveStateBuff_t);
    memset(&filterBitmap.FilterBitmap, 0, 16);
    if (sl_WlanGet(SL_WLAN_RX_FILTERS_ID, &ConfigOpt, &ConfigSize,
                     (uint8_t*)&filterBitmap)) {
        dbg_printf("Error: Read internal filters\r\n");
        while( 1 );
    }

    if (0x0 != filterBitmap.FilterBitmap) {
        memset(&filterBitmap.FilterBitmap, 0x00, 16);
        if (sl_WlanSet(SL_WLAN_RX_FILTERS_ID, SL_WLAN_RX_FILTER_STATE,
                         sizeof(SlWlanRxFilterOperationCommandBuff_t),
                         (uint8_t *)&filterBitmap)) {
            dbg_printf("Error: Disable internal filters\r\n");
            while( 1 );
        }
    }

    memset(&filterBitmap.FilterBitmap, 0, 16);
    if (sl_WlanGet(SL_WLAN_RX_FILTERS_ID, &ConfigOpt, &ConfigSize,
                     (uint8_t*)&filterBitmap)) {
        dbg_printf("Error: Read internal filters\r\n");
        while( 1 );
    }
}

It's not possible for me to generate any ipv6 traffic towards this node as I am waiting for a router advertisement first which never arrives.

The interesting part here is that just for sake of it I build same code (network bypass on a second eval board but put it in AP mode) my first module sends the ipv6 packet to a multicast address and I can see that the AP mode modules successfully receives it. Is there a difference between AP and STA mode in terms of stack bypass ?

0 Jesu over 4 years ago in reply to Stanislav Andrianov

TI__Mastermind 22935 points

Hello Stanislav,

Let me reach out to our network bypass expert and get back to you tomorrow.

Jesu

0 Stanislav Andrianov over 4 years ago in reply to Jesu

Prodigy 40 points

Looks like i can receive all types of packets but not IPv6 packets. I am able to receive router spanning tree protocol and all other misc packets which leads me to believe that the bypass mode is working correctly. However, I cannot see any IPv6 (note: I can definitely send them OUT) but not Receive! (which is what i need)

0 Stanislav Andrianov over 4 years ago in reply to Stanislav Andrianov

Prodigy 40 points

    _u32 IfBitmap = 0;
    IfBitmap = SL_NETCFG_IF_IPV6_STA_LOCAL | SL_NETCFG_IF_IPV6_STA_GLOBAL;
    if (sl_NetCfgSet(SL_NETCFG_IF,SL_NETCFG_IF_STATE,sizeof(IfBitmap),(uint8_t*) &IfBitmap))
    {
        while( 1 );
    }

Enabling interfaces :) helped. I had an assumptions that settings ip to 0.0.0.0 and disabling filters was enough.

0 Jesu over 4 years ago in reply to Stanislav Andrianov

TI__Mastermind 22935 points

That makes sense. IPv6 is disabled by default. Sorry for not thinking of that sooner.

Jesu

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CC3220S: Cannot receive IPv6 Multicast packets in bypass mode