On 06/18/2019 05:35 AM, Michael Ellerman wrote:
> Haren Myneni <haren@xxxxxxxxxxxxxxxxxx> writes:
>>
>> System gets checkstop if RxFIFO overruns with more requests than the
>> maximum possible number of CRBs in FIFO at the same time. So find max
>> CRBs from FIFO size and set it to receive window credits.
>>
>> CC: stable@xxxxxxxxxxxxxxx # v4.14+
>> Signed-off-by:Haren Myneni <haren@xxxxxxxxxx>
>
> It's helpful to mention the actual commit that's fixed, so that people
> with backports can join things up, so should that be:
>
> Fixes: b0d6c9bab5e4 ("crypto/nx: Add P9 NX support for 842 compression engine")
>
> ???
Sorry, Yes, We use 1K for Rx window credits in b0d6c9bab5e41d07f (crypto/nx: Add P9 NX support for 842 compression engine). But credits should be based on FIFO size.
I will repost the patch.
>
> cheers
>
>> diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c
>> index 4acbc47..e78ff5c 100644
>> --- a/drivers/crypto/nx/nx-842-powernv.c
>> +++ b/drivers/crypto/nx/nx-842-powernv.c
>> @@ -27,8 +27,6 @@
>> #define WORKMEM_ALIGN (CRB_ALIGN)
>> #define CSB_WAIT_MAX (5000) /* ms */
>> #define VAS_RETRIES (10)
>> -/* # of requests allowed per RxFIFO at a time. 0 for unlimited */
>> -#define MAX_CREDITS_PER_RXFIFO (1024)
>>
>> struct nx842_workmem {
>> /* Below fields must be properly aligned */
>> @@ -812,7 +810,11 @@ static int __init vas_cfg_coproc_info(struct device_node *dn, int chip_id,
>> rxattr.lnotify_lpid = lpid;
>> rxattr.lnotify_pid = pid;
>> rxattr.lnotify_tid = tid;
>> - rxattr.wcreds_max = MAX_CREDITS_PER_RXFIFO;
>> + /*
>> + * Maximum RX window credits can not be more than #CRBs in
>> + * RxFIFO. Otherwise, can get checkstop if RxFIFO overruns.
>> + */
>> + rxattr.wcreds_max = fifo_size / CRB_SIZE;
>>
>> /*
>> * Open a VAS receice window which is used to configure RxFIFO
>
