netdev - Re: [ISSUE: sky2 - rx error] Link stops working under heavy traffic load connected to a mv88e6176

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Message-ID: <591AF9FD.1000304@aoifes.com>
Date:   Tue, 16 May 2017 15:09:17 +0200
From:   Rafa Corvillo <rafael.corvillo@...fes.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        netdev@...r.kernel.org
Subject: Re: [ISSUE: sky2 - rx error] Link stops working under heavy traffic
 load connected to a mv88e6176

>> Adding 8 bytes (sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN + 8
>> (EDSA_HLEN)) does not fix the error, because the interface keep
>> having a maximum length of 1518 bytes (sky2->netdev->mtu + ETH_HLEN
>> + VLAN_HLEN).
>
> Did you check the value being written to here:
>
>          /*
>           * The receiver hangs if it receives frames larger than the
>           * packet buffer. As a workaround, truncate oversize frames, but
>           * the register is limited to 9 bits, so if you do frames > 2052
>           * you better get the MTU right!
>           */
>          thresh = sky2_get_rx_threshold(sky2);
>          if (thresh > 0x1ff)
>                  sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF);
>          else {
>                  sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh);
>                  sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON);
>          }
>
>
> What is thresh?

The value of thresh is 380.

Rafa

>
>       Andrew
>