linux-kernel - Re: [RFC PATCH 1/7] PF driver modified to enable HW filter support, changes works in backward compatibility mode Enable required things in Makefile Enable LZ4 dependecy inside config file

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Message-ID: <CA+sq2Cc0L3hqV_TUxtf00-UnUs8gMJfjL7bZaGejGevDYn6mPg@mail.gmail.com>
Date:   Tue, 27 Dec 2016 09:49:57 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     "Koteshwar Rao, Satha" <Satha.Rao@...ium.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "Goutham, Sunil" <Sunil.Goutham@...ium.com>,
        Robert Richter <rric@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Daney, David" <David.Daney@...ium.com>,
        "Vatsavayi, Raghu" <Raghu.Vatsavayi@...ium.com>,
        "Chickles, Derek" <Derek.Chickles@...ium.com>,
        "Romanov, Philip" <Philip.Romanov@...ium.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 1/7] PF driver modified to enable HW filter support,
 changes works in backward compatibility mode Enable required things in
 Makefile Enable LZ4 dependecy inside config file

>>  #define NIC_MAX_RSS_HASH_BITS          8
>>  #define NIC_MAX_RSS_IDR_TBL_SIZE       (1 << NIC_MAX_RSS_HASH_BITS)
>> +#define NIC_TNS_RSS_IDR_TBL_SIZE       5
>
> So you want to use only 5 queues per VF when TNS is enabled, is it ??
> There are 4096 RSS indices in total, for each VF you can use max 32.
> I guess you wanted to set no of hash bits to 5 instead of table size.
>
> SATHA>>> We enabled 8 queues for VF. Yes Macro name misleads it has to be hash bits, will change this in next version

No, I am not referring to any discrepancy in naming the macro.
If you check your code

- hw->rss_ind_tbl_size = NIC_MAX_RSS_IDR_TBL_SIZE;
+ hw->rss_ind_tbl_size = veb_enabled ? NIC_TNS_RSS_IDR_TBL_SIZE :
+     NIC_MAX_RSS_IDR_TBL_SIZE;

You are setting RSS table size to 5, i.e RSS hash bits will be set to 2.
Hence only 4 queues (not even 5 as i mentioned earlier). Please check
'nicvf_rss_init' you will understand what i am saying.
Have you tested and observed pkts in all 8 queues ?