[dpdk-dev] [PATCH v3 1/1] common/octeontx2: fix unaligned mbox memory accesses

Jerin Jacob Kollanukkaran jerinj at marvell.com
Fri Aug 2 11:55:33 CEST 2019


> -----Original Message-----
> From: vattunuru at marvell.com <vattunuru at marvell.com>
> Sent: Friday, August 2, 2019 12:27 PM
> To: dev at dpdk.org
> Cc: thomas at monjalon.net; Jerin Jacob Kollanukkaran <jerinj at marvell.com>;
> Vamsi Krishna Attunuru <vattunuru at marvell.com>; Nithin Kumar
> Dabilpuram <ndabilpuram at marvell.com>
> Subject: [dpdk-dev] [PATCH v3 1/1] common/octeontx2: fix unaligned mbox
> memory accesses
> 
> From: Vamsi Attunuru <vattunuru at marvell.com>
> 
> Octeontx2 PMD's mailbox client uses device memory to send messages to
> mailbox server in the admin function Linux kernel driver.
> The device memory used for the mailbox communication needs to be
> qualified as volatile memory type to avoid unaligned device memory
> accesses because of compiler's memory access coalescing.
> 
> This patch modifies the mailbox request and responses as volatile type which
> were non-volatile earlier and accessed from unaligned memory addresses
> which resulted in bus errors on Fedora 30 with gcc 9.1.1.
> 
> Fixes: 2b71657c8660 ("common/octeontx2: add mbox request and response
> definition")
> 
> Signed-off-by: Vamsi Attunuru <vattunuru at marvell.com>
> Signed-off-by: Nithin Dabilpuram <ndabilpuram at marvell.com>

Acked-by: Jerin Jacob <jerinj at marvell.com>

Thomas,

Could you merge this patch for rc4. It fixes the bus error with  Fedora 30 with gcc 9.1.1.


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