[dpdk-dev,v2] mbuf: fix 64bit address alignment in 32-bit builds
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Commit Message
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@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.
---
lib/librte_mbuf/rte_mbuf.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
Comments
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@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
@@ -403,7 +403,13 @@ struct rte_mbuf {
MARKER cacheline0;
void *buf_addr; /**< Virtual address of segment buffer. */
- phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
+ /**
+ * Physical address of segment buffer.
+ * Force alignment to 8-bytes, so as to ensure we have the exact
+ * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
+ * working on vector drivers easier.
+ */
+ phys_addr_t buf_physaddr __rte_aligned(sizeof(phys_addr_t));
/* next 8 bytes are initialised on RX descriptor rearm */
MARKER64 rearm_data;