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Socket buffer allocation outside DMA-able memory

Subject: Socket buffer allocation outside DMA-able memory
From: art <>
Date: Fri, 2 Jun 2006 20:26:16 +0700
Organization: Sigrand LLC
Original-recipient: rfc822;
Reply-to: art <>
Hello all!
I work with ADM5120 chip. it has embedded switch.
Switch descriptor has 25-bit dma addres field - so addressible only
My system has 64Mb memory. But I have to set 32Mb to make it work!
I thought that setting DMA mask can help. So in
/arch/mips/adm5120/setup.c i make:

static struct platform_device adm5120hcd_device = {
        .name           = "adm5120-hcd",
        .id             = -1,
        .dev            = {
        .dma_mask               = &hcd_dmamask,
        .coherent_dma_mask      = 0x01ffffff,
        .num_resources  = ARRAY_SIZE(adm5120_hcd_resources),
        .resource       = adm5120_hcd_resources,
But It is wrong, because dev_alloc_skb dont know to which device it
allocates buffer!

How to tell kernel allocate skbuffers in less then 32Mb addrspace whet
system has 64Mb?

Best regards,

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