netdev - RE: [EXT] Re: [net PATCH] octeontx2-pf: Fix ntuple rule creation to direct packet to VF with higher Rx queue than its PF

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Date: Tue, 21 Nov 2023 09:54:00 +0000
From: Suman Ghosh <sumang@...vell.com>
To: Wojciech Drewek <wojciech.drewek@...el.com>,
        Sunil Kovvuri Goutham
	<sgoutham@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>,
        Subbaraya
 Sundeep Bhatta <sbhatta@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        Linu Cherian <lcherian@...vell.com>,
        Jerin Jacob Kollanukkaran
	<jerinj@...vell.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org"
	<kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "horms@...nel.org" <horms@...nel.org>
Subject: RE: [EXT] Re: [net PATCH] octeontx2-pf: Fix ntuple rule creation to
 direct packet to VF with higher Rx queue than its PF

>> Signed-off-by: Suman Ghosh <sumang@...vell.com>
>> ---
>>  .../marvell/octeontx2/nic/otx2_flows.c        | 21
>+++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
>> b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
>> index 4762dbea64a1..4200f2d387f6 100644
>> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
>> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
>> @@ -1088,6 +1088,7 @@ int otx2_add_flow(struct otx2_nic *pfvf, struct
>ethtool_rxnfc *nfc)
>>  	struct ethhdr *eth_hdr;
>>  	bool new = false;
>>  	int err = 0;
>> +	u64 vf_num;
>>  	u32 ring;
>>
>>  	if (!flow_cfg->max_flows) {
>> @@ -1100,9 +1101,26 @@ int otx2_add_flow(struct otx2_nic *pfvf, struct
>ethtool_rxnfc *nfc)
>>  	if (!(pfvf->flags & OTX2_FLAG_NTUPLE_SUPPORT))
>>  		return -ENOMEM;
>>
>> +	/* Number of queues on a VF can be greater or less than
>> +	 * the PF's queue. Hence no need to check for the
>> +	 * queue count. Hence no need to check queue count if PF
>> +	 * is installing for its VF. Below is the expected vf_num value
>> +	 * based on the ethtool commands.
>> +	 *
>> +	 * e.g.
>> +	 * 1. ethtool -U <netdev> ... action -1  ==> vf_num:255
>> +	 * 2. ethtool -U <netdev> ... action <queue_num>  ==> vf_num:0
>> +	 * 3. ethtool -U <netdev> ... vf <vf_idx> queue <queue_num>  ==>
>> +	 *    vf_num:vf_idx+1
>> +	 */
>> +	vf_num = ethtool_get_flow_spec_ring_vf(fsp->ring_cookie);
>> +	if (!is_otx2_vf(pfvf->pcifunc) && vf_num)
>> +		goto bypass_queue_check;
>
>Let's just add this condition to the next if, no need for goto.
[Suman] I kept it a separate check to make the code more readable. Otherwise the next if condition will be complicated.
>
>> +
>>  	if (ring >= pfvf->hw.rx_queues && fsp->ring_cookie !=
>RX_CLS_FLOW_DISC)
>>  		return -EINVAL;
>>
>> +bypass_queue_check:
>>  	if (fsp->location >= otx2_get_maxflows(flow_cfg))
>>  		return -EINVAL;
>>
>> @@ -1182,6 +1200,9 @@ int otx2_add_flow(struct otx2_nic *pfvf, struct
>ethtool_rxnfc *nfc)
>>  		flow_cfg->nr_flows++;
>>  	}
>>
>> +	if (flow->is_vf)
>> +		netdev_info(pfvf->netdev,
>> +			    "Make sure that VF's queue number is within its queue
>> +limit\n");
>>  	return 0;
>>  }
>>