linux-kernel - 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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Message-ID: <20231121155511.GC269041@kernel.org>
Date:   Tue, 21 Nov 2023 15:55:11 +0000
From:   Simon Horman <horms@...nel.org>
To:     Suman Ghosh <sumang@...vell.com>
Cc:     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>
Subject: Re: [EXT] Re: [net PATCH] octeontx2-pf: Fix ntuple rule creation to
 direct packet to VF with higher Rx queue than its PF

On Tue, Nov 21, 2023 at 09:54:00AM +0000, Suman Ghosh wrote:
> >> 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.

Readability is subjective, but, FWIIW, I'd also prefer
to avoid a goto here.

> >> +
> >>  	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;
> >>  }
> >>