RE: [EXT] Re: [PATCH] octeontx2-pf: Add egress PFC support

[Suman Ghosh]

Please see inline

Regards,
Suman

>-----Original Message-----
>From: Andrew Lunn <andrew@xxxxxxx>
>Sent: Tuesday, August 23, 2022 9:21 PM
>To: Suman Ghosh <sumang@xxxxxxxxxxx>
>Cc: Sunil Kovvuri Goutham <sgoutham@xxxxxxxxxxx>; Linu Cherian
><lcherian@xxxxxxxxxxx>; Geethasowjanya Akula <gakula@xxxxxxxxxxx>; Jerin
>Jacob Kollanukkaran <jerinj@xxxxxxxxxxx>; Hariprasad Kelam
><hkelam@xxxxxxxxxxx>; Subbaraya Sundeep Bhatta <sbhatta@xxxxxxxxxxx>;
>davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx;
>pabeni@xxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
>Subject: [EXT] Re: [PATCH] octeontx2-pf: Add egress PFC support
>
>External Email
>
>----------------------------------------------------------------------
>> -int otx2_txschq_config(struct otx2_nic *pfvf, int lvl)
>> +int otx2_txschq_config(struct otx2_nic *pfvf, int lvl, int prio, bool
>> +txschq_for_pfc)
>>  {
>>  	struct otx2_hw *hw = &pfvf->hw;
>>  	struct nix_txschq_config *req;
>> @@ -602,7 +602,13 @@ int otx2_txschq_config(struct otx2_nic *pfvf, int
>lvl)
>>  	req->lvl = lvl;
>>  	req->num_regs = 1;
>>
>> -	schq = hw->txschq_list[lvl][0];
>> +#ifdef CONFIG_DCB
>> +	if (txschq_for_pfc)
>> +		schq = pfvf->pfc_schq_list[lvl][prio];
>> +	else
>> +#endif
>
>Please could you try to remove as many of these #ifdef CONFIG_DCB as
>possible. It makes build testing less efficient at finding build
>problems. Can you do:
>
>> +	if (IS_ENABLED(CONFIG_DCB) && txschq_for_pfc)
>> +		schq = pfvf->pfc_schq_list[lvl][prio];
>
[Suman] I will restructured the code. But we cannot use pfvf->pfc_schq_list outside #ifdef CONFIG_DCB as these are defined under the 
macro in otx2_common.h

>> +#ifdef CONFIG_DCB
>> +int otx2_pfc_txschq_config(struct otx2_nic *pfvf) {
>> +	u8 pfc_en, pfc_bit_set;
>> +	int prio, lvl, err;
>> +
>> +	pfc_en = pfvf->pfc_en;
>> +	for (prio = 0; prio < NIX_PF_PFC_PRIO_MAX; prio++) {
>> +		pfc_bit_set = pfc_en & (1 << prio);
>> +
>
>Maybe put all of this into a file of its own, and provide stubs for when
>it is not enabled?
[Suman] I will move these APIs to otx2_dcbnl.c. This file will be compiled when CONFIG_DCB is enabled.

>
>     Andrew