Next message: kernel test robot: " net/sched/sch_bpf.What if you replace NET_SKB_PAD with, let's say, 8? > end of the cycle, I'd be more comfortable if we reverted this patch.Ĭan it be that the HW can't do DMA on an address which is not word aligned? > Unless you can fix it very quickly, and given that we're towards the > a similar logic as its buf1 counterpart.) indirection requires pointer operand (int invalid). Probably stmmac_rx_buf2_len() also need adjusting (it has Indirection In computer programming, indirection is the ability to reference something using a. > stmmac_rx_buf1_len() only could be (only compile tested, I don't have > A possible fix, which takes in account also the XDP headroom for This is an empty XDP program, its source:Įvery packet will pass untouched, but the offset will be shifted fromĠ to 256 bytes, which could trigger the problem anyway:
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> Sorry, you'll have to hold my hand here, as I know exactly nothing > attaching an XDP program and see if it works without my change? Also, when XDP is enabled, the offset was > Better to use stmmac_rx_offset() so to have the correct length when char a char b char c a ’g’ b &a c &b Here b points to a char that stores ‘g’ and c points to the pointer b. The syntax simply requires the unary operator () for each level of indirection while declaring the pointer. > before a more polished version can be submitted. In C++, we can create a pointer to a pointer that in turn may point to data or other pointer. > Matteo, if you do not work on a fix, I suggest we revert
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> I wont have time in the immediate future.
Indirection requires pointer operand Patch#
> more complete patch if/when you have one. > Feels like a major deficiency of the original patch. > static unsigned int stmmac_rx_buf2_len(struct stmmac_priv *priv, > + return min_t(unsigned int, priv->dma_buf_sz - NET_SKB_PAD > - return min_t(unsigned int, priv->dma_buf_sz, plen) > /* First descriptor and last descriptor and not split > plen = stmmac_get_rx_frame_len(priv, p, coe) > + return priv->dma_buf_sz - NET_SKB_PAD. > not split header */ if (status & rx_not_ls) > stmmac_priv *priv, /* First descriptor, not last descriptor and > +4508,12 static unsigned int stmmac_rx_buf1_len(struct > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c -4508,12
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> 100644 - a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index > diff -git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > Presumably DEFAULT_BUFSIZE also want to be increased by NET_SKB_PAD > stmmac_rx_buf1_len() and stmmac_rx_buf2_len() ? > Are you sure you do not need to adjust stmmac_set_bfsize(),
![indirection requires pointer operand indirection requires pointer operand](https://www.iditect.com/imgs/guide/cpp-pointer-to-pointer-1.jpg)
Indirection requires pointer operand code#
The code that contains unsafe blocks must be compiled with the AllowUnsafeBlocks compiler option. Any operation with pointers requires an unsafe context.