Re: [PATCH net-next] net: stmmac: Add support for CBS QDISC

[Jose Abreu <Jose.Abreu@synopsys.com>]

++ LKML because I just noticed this is using generic headers.

On 27-06-2018 15:32, Jose Abreu wrote:
> ++ SH Maintainers
> ++ SH ML
>
> Hi SH Maintainers,
>
> On 27-06-2018 15:15, kbuild test robot wrote:
>> Hi Jose,
>>
>> I love your patch! Perhaps something to improve:
>>
>> [auto build test WARNING on net-next/master]
>>
>> url:    https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_0day-2Dci_linux_commits_Jose-2DAbreu_net-2Dstmmac-2DAdd-2Dsupport-2Dfor-2DCBS-2DQDISC_20180627-2D214704&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=YIae3rrFzqYg_5b4eVIAXuyvT_EV0vKACS25rJugux8&s=qW5_vbinGt0OnyDfQ2wtKdb2ZGzCcLwq6Fmlaki61xw&e=
>> config: sh-allyesconfig (attached as .config)
>> compiler: sh4-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
>> reproduce:
>>         wget https://urldefense.proofpoint.com/v2/url?u=https-3A__raw.githubusercontent.com_intel_lkp-2Dtests_master_sbin_make.cross&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=YIae3rrFzqYg_5b4eVIAXuyvT_EV0vKACS25rJugux8&s=4nNar4fgVZq0LjrPKIZP30nxVUY4yeu5QeyKbmlsu8A&e= -O ~/bin/make.cross
>>         chmod +x ~/bin/make.cross
>>         # save the attached .config to linux build tree
>>         GCC_VERSION=7.2.0 make.cross ARCH=sh 
>>
>> All warnings (new ones prefixed by >>):
>>
>>    In file included from ./arch/sh/include/generated/asm/div64.h:1:0,
>>                     from include/linux/kernel.h:174,
>>                     from include/linux/list.h:9,
>>                     from include/linux/timer.h:5,
>>                     from include/linux/workqueue.h:9,
>>                     from include/net/pkt_cls.h:6,
>>                     from drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c:7:
>>    drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c: In function 'tc_setup_cbs':
>>    include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
>>      (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
>>                                ^
>>>> drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c:325:2: note: in expansion of macro 'do_div'
>>      do_div(value, speed_div);
>>      ^~~~~~
>>    include/asm-generic/div64.h:222:28: warning: comparison of distinct pointer types lacks a cast
>>      (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
> I'm not seeing the reason for this warning as I'm using a 64 bit
> var. I guess the warning is appearing only because its signed
> [see source bellow]. Is this not supported?
>
> Thanks and Best Regards,
> Jose Miguel Abreu
>
>>                                ^
>>    drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c:329:2: note: in expansion of macro 'do_div'
>>      do_div(value, speed_div);
>>      ^~~~~~
>>
>> vim +/do_div +325 drivers/net//ethernet/stmicro/stmmac/stmmac_tc.c
>>
>>    291	
>>    292	static int tc_setup_cbs(struct stmmac_priv *priv,
>>    293				struct tc_cbs_qopt_offload *qopt)
>>    294	{
>>    295		u32 tx_queues_count = priv->plat->tx_queues_to_use;
>>    296		u32 queue = qopt->queue;
>>    297		u32 ptr, speed_div;
>>    298		u32 mode_to_use;
>>    299		s64 value;
>>    300		int ret;
>>    301	
>>    302		/* Queue 0 is not AVB capable */
>>    303		if (queue <= 0 || queue >= tx_queues_count)
>>    304			return -EINVAL;
>>    305		if (priv->speed != SPEED_100 && priv->speed != SPEED_1000)
>>    306			return -EOPNOTSUPP;
>>    307	
>>    308		mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use;
>>    309		if (mode_to_use == MTL_QUEUE_DCB && qopt->enable) {
>>    310			ret = stmmac_dma_qmode(priv, priv->ioaddr, queue, MTL_QUEUE_AVB);
>>    311			if (ret)
>>    312				return ret;
>>    313	
>>    314			priv->plat->tx_queues_cfg[queue].mode_to_use = MTL_QUEUE_AVB;
>>    315		} else if (!qopt->enable) {
>>    316			return stmmac_dma_qmode(priv, priv->ioaddr, queue, MTL_QUEUE_DCB);
>>    317		}
>>    318	
>>    319		/* Port Transmit Rate and Speed Divider */
>>    320		ptr = (priv->speed == SPEED_100) ? 4 : 8;
>>    321		speed_div = (priv->speed == SPEED_100) ? 100000 : 1000000;
>>    322	
>>    323		/* Final adjustments for HW */
>>    324		value = qopt->idleslope * 1024 * ptr;
>>  > 325		do_div(value, speed_div);
>>    326		priv->plat->tx_queues_cfg[queue].idle_slope = value & GENMASK(31, 0);
>>    327	
>>    328		value = -qopt->sendslope * 1024UL * ptr;
>>    329		do_div(value, speed_div);
>>    330		priv->plat->tx_queues_cfg[queue].send_slope = value & GENMASK(31, 0);
>>    331	
>>    332		value = qopt->hicredit * 1024 * 8;
>>    333		priv->plat->tx_queues_cfg[queue].high_credit = value & GENMASK(31, 0);
>>    334	
>>    335		value = qopt->locredit * 1024 * 8;
>>    336		priv->plat->tx_queues_cfg[queue].low_credit = value & GENMASK(31, 0);
>>    337	
>>    338		ret = stmmac_config_cbs(priv, priv->hw,
>>    339					priv->plat->tx_queues_cfg[queue].send_slope,
>>    340					priv->plat->tx_queues_cfg[queue].idle_slope,
>>    341					priv->plat->tx_queues_cfg[queue].high_credit,
>>    342					priv->plat->tx_queues_cfg[queue].low_credit,
>>    343					queue);
>>    344		if (ret)
>>    345			return ret;
>>    346	
>>    347		dev_info(priv->device, "CBS queue %d: send %d, idle %d, hi %d, lo %d\n",
>>    348				queue, qopt->sendslope, qopt->idleslope,
>>    349				qopt->hicredit, qopt->locredit);
>>    350		return 0;
>>    351	}
>>    352	
>>
>> ---
>> 0-DAY kernel test infrastructure                Open Source Technology Center
>> https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.01.org_pipermail_kbuild-2Dall&d=DwIBAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=WHDsc6kcWAl4i96Vm5hJ_19IJiuxx_p_Rzo2g-uHDKw&m=YIae3rrFzqYg_5b4eVIAXuyvT_EV0vKACS25rJugux8&s=yMjbhyNoi6ZESIohHtaqFOTXipZVefU7mA4Tfc5QPms&e=                   Intel Corporation