Re: [dpdk-dev] [PATCH v2 4/4] net/mlx4: add new Memory Region support

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 5/10/2018 7:01 AM, Yongseok Koh wrote:
> 
>> On May 9, 2018, at 8:00 PM, Yongseok Koh <yskoh@mellanox.com> wrote:
>>
>>
>>> On May 9, 2018, at 4:12 PM, Ferruh Yigit <ferruh.yigit@intel.com> wrote:
>>>
>>> On 5/9/2018 12:09 PM, Yongseok Koh wrote:
>>> <...>
>>>
>>>> +/**
>>>> + * Insert an entry to B-tree lookup table.
>>>> + *
>>>> + * @param bt
>>>> + *   Pointer to B-tree structure.
>>>> + * @param entry
>>>> + *   Pointer to new entry to insert.
>>>> + *
>>>> + * @return
>>>> + *   0 on success, -1 on failure.
>>>> + */
>>>> +static int
>>>> +mr_btree_insert(struct mlx4_mr_btree *bt, struct mlx4_mr_cache *entry)
>>>> +{
>>>> +	struct mlx4_mr_cache *lkp_tbl;
>>>> +	uint16_t idx = 0;
>>>> +	size_t shift;
>>>> +
>>>> +	assert(bt != NULL);
>>>> +	assert(bt->len <= bt->size);
>>>> +	assert(bt->len > 0);
>>>> +	lkp_tbl = *bt->table;
>>>> +	/* Find out the slot for insertion. */
>>>> +	if (mr_btree_lookup(bt, &idx, entry->start) != UINT32_MAX) {
>>>> +		DEBUG("abort insertion to B-tree(%p):"
>>>> +		      " already exist at idx=%u [0x%lx, 0x%lx) lkey=0x%x",
>>>> +		      (void *)bt, idx, entry->start, entry->end, entry->lkey);
>>>
>>> This and various other logs causing 32bits build error because of %lx usage. Can
>>> you please check them?
>>>
>>> I am feeling sad to complain a patch like this just because of log format issue,
>>> we should find a solution to this issue as community, either checkpatch checks
>>> or automated 32bit builds, I don't know.
>>
>> Bummer. I have to change my bad habit of using %lx. And we will add 32-bit build
>> check to our internal system to filter this kind of mistakes beforehand.
>>
>> Will work with Shahaf to fix it and rebase next-net-mlx.
> 
> Ferruh, I've sent out a patch to Shahaf to change printing format specifiers and
> Shahaf will squash it into the previous patches.
> 
> However, it seems we had stopped supporting 32-bit compilation since Nelio's
> commit [1]
> 
> Not sure I'm doing right but I'm compiling it for T=i686-native-linuxapp-gcc and
> still having a few more errors even except for my code. And even if I fix all of
> the errors, linkage fails as explained in the commit message of [1].
> 
> Are you sure you encountered this 32b compilation issue for the first time?

I do just compilation on mlx drivers.
And building only mlx4 for 32bits, mlx5 doesn't support 32bits as you point out
below patch. mlx4 32bit compiles fine with me as same config you have used.

Also features documentation [2] verifies this, mlx4 supports 32bits but mlx5 not.

[2]
https://dpdk.org/browse/next/dpdk-next-net/tree/doc/guides/nics/features/mlx4.ini?h=v18.02#n32
https://dpdk.org/browse/next/dpdk-next-net/tree/doc/guides/nics/features/mlx5.ini?h=v18.02#n42

> 
> 
> [1] http://dpdk.org/browse/dpdk/commit/?id=ebbb81eb27daca0a89ee8f228fcf141d9eb6ef1c
> 
> 
> Thanks,
> Yongseok
> 
>