Re: sky2 panic in 2.6.32.1 under load (new oops)

[Michael Breuer]

One more data point - it appears that the errors are occurring when the 
interface is under load AND there is ipv6 dns activity. As this only 
happens when under load I can't prove it, but it seems there is a 
correlation.
> There could be DMA problems, either because chip isn't remembering
> upper address, or because of lack of wires from chip to memory controller;
> there have been problems on motherboards where I/O devices couldn't access
> all of memory.
>
> Try this, it forces each transmit to have full 64 bit address. It drops an
> optimization that was done to reduce the number of transmit descriptors
> used.
>
> --- a/drivers/net/sky2.c	2009-12-29 09:23:37.114074275 -0800
> +++ b/drivers/net/sky2.c	2009-12-29 09:26:38.699912035 -0800
> @@ -1038,10 +1038,11 @@ static void tx_init(struct sky2_port *sk
>   	sky2->tx_tcpsum = 0;
>   	sky2->tx_last_mss = 0;
>
> -	le = get_tx_le(sky2,&sky2->tx_prod);
> -	le->addr = 0;
> -	le->opcode = OP_ADDR64 | HW_OWNER;
> -	sky2->tx_last_upper = 0;
> +	if (sizeof(dma_addr_t) == sizeof(u32)) {
> +		le = get_tx_le(sky2,&sky2->tx_prod);
> +		le->addr = 0;
> +		le->opcode = OP_ADDR64 | HW_OWNER;
> +	}
>   }
>
>   /* Update chip's next pointer */
> @@ -1669,10 +1670,9 @@ static netdev_tx_t sky2_xmit_frame(struc
>
>   	/* Send high bits if needed */
>   	upper = upper_32_bits(mapping);
> -	if (upper != sky2->tx_last_upper) {
> +	if (sizeof(mapping)>  sizeof(u32)) {
>   		le = get_tx_le(sky2,&slot);
>   		le->addr = cpu_to_le32(upper);
> -		sky2->tx_last_upper = upper;
>   		le->opcode = OP_ADDR64 | HW_OWNER;
>   	}
>
> @@ -1762,10 +1762,9 @@ static netdev_tx_t sky2_xmit_frame(struc
>   			goto mapping_unwind;
>
>   		upper = upper_32_bits(mapping);
> -		if (upper != sky2->tx_last_upper) {
> +		if (sizeof(mapping)>  sizeof(u32)) {
>   			le = get_tx_le(sky2,&slot);
>   			le->addr = cpu_to_le32(upper);
> -			sky2->tx_last_upper = upper;
>   			le->opcode = OP_ADDR64 | HW_OWNER;
>   		}
>
> --- a/drivers/net/sky2.h	2009-12-29 09:23:37.164072886 -0800
> +++ b/drivers/net/sky2.h	2009-12-29 09:25:15.302197993 -0800
> @@ -2191,7 +2191,6 @@ struct sky2_port {
>
>   	u16		     tx_pending;
>   	u16		     tx_last_mss;
> -	u32		     tx_last_upper;
>   	u32		     tx_tcpsum;
>
>   	struct rx_ring_info  *rx_ring ____cacheline_aligned_in_smp;
>    

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