[dpdk-dev] [PATCH v2] mbuf: fix 64bit address alignment in 32-bit builds

[Thomas Monjalon]

28/04/2017 15:10, Bruce Richardson:
> On i686 builds, the uin64_t type is 64-bits in size but is aligned to
> 32-bits only. This causes mbuf fields for rearm_data to not be 16-byte
> aligned on 32-bit builds, which causes errors with some vector PMDs which
> expect the rearm data to be aligned as on 64-bit.
> 
> Given that we cannot use the extra space in the data structures anyway, as
> it's already used on 64-bit builds, we can just force alignment of the
> physical address in the mbuf to 8-bytes in all cases. This has no effect on
> 64-bit systems, but fixes the updated PMDs on 32-bit.
> 
> Fixes: f4356d7ca168 ("net/i40e: eliminate mbuf write on rearm")
> Fixes: f160666a1073 ("net/ixgbe: eliminate mbuf write on rearm")
> 
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
> v2: change alignment fix from being for all phys_addr_t vars to just
> the one in the mbuf structure. This is a lower risk fix. Additional
> patches promised to put in build-checks for alignment in vpmds will
> be sent separately.

Applied, thanks