netdev - Re: [net-next Patch v2 2/5] octeontx2-pf: qos send queues management

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Date:   Sun, 22 Jan 2023 17:46:49 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Hariprasad Kelam <hkelam@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        edumazet@...gle.com, sgoutham@...vell.com, lcherian@...vell.com,
        gakula@...vell.com, jerinj@...vell.com, sbhatta@...vell.com,
        jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        saeedm@...dia.com, richardcochran@...il.com, tariqt@...dia.com,
        linux-rdma@...r.kernel.org, maxtram95@...il.com
Subject: Re: [net-next Patch v2 2/5] octeontx2-pf: qos send queues management

On Wed, Jan 18, 2023 at 04:21:04PM +0530, Hariprasad Kelam wrote:
> From: Subbaraya Sundeep <sbhatta@...vell.com>
> 
> Current implementation is such that the number of Send queues (SQs)
> are decided on the device probe which is equal to the number of online
> cpus. These SQs are allocated and deallocated in interface open and c
> lose calls respectively.
> 
> This patch defines new APIs for initializing and deinitializing Send
> queues dynamically and allocates more number of transmit queues for
> QOS feature.
> 
> Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
> Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>

...

> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> index 88f8772a61cd..0868ae825736 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.c
> @@ -758,11 +758,16 @@ int otx2_txschq_stop(struct otx2_nic *pfvf)
>  void otx2_sqb_flush(struct otx2_nic *pfvf)
>  {
>  	int qidx, sqe_tail, sqe_head;
> +	struct otx2_snd_queue *sq;
>  	u64 incr, *ptr, val;
>  	int timeout = 1000;
>  
>  	ptr = (u64 *)otx2_get_regaddr(pfvf, NIX_LF_SQ_OP_STATUS);
> -	for (qidx = 0; qidx < pfvf->hw.tot_tx_queues; qidx++) {
> +	for (qidx = 0; qidx < pfvf->hw.tot_tx_queues + pfvf->hw.tc_tx_queues;

nit:

It seems awkward that essentially this is saying that the
total tx queues is 'tot_tx_queues' + 'tc_tx_queues'.
As I read 'tot' as being short for 'total'.

Also, the pfvf->hw.tot_tx_queues + pfvf->hw.tc_tx_queues pattern
is rather verbose and repeated often. Perhaps a helper would... help.

> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> index c1ea60bc2630..3acda6d289d3 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_pf.c

...

> @@ -1688,11 +1693,13 @@ int otx2_open(struct net_device *netdev)
>  
>  	netif_carrier_off(netdev);
>  
> -	pf->qset.cq_cnt = pf->hw.rx_queues + pf->hw.tot_tx_queues;
>  	/* RQ and SQs are mapped to different CQs,
>  	 * so find out max CQ IRQs (i.e CINTs) needed.
>  	 */
>  	pf->hw.cint_cnt = max(pf->hw.rx_queues, pf->hw.tx_queues);
> +	pf->hw.cint_cnt = max_t(u8, pf->hw.cint_cnt, pf->hw.tc_tx_queues);

nit: maybe this is nicer? *completely untested!*

	pf->hw.cint_cnt = max3(pf->hw.rx_queues, pf->hw.tx_queues),
			       pf->hw.tc_tx_queues);

...

> @@ -735,7 +741,10 @@ static void otx2_sqe_add_hdr(struct otx2_nic *pfvf, struct otx2_snd_queue *sq,
>  		sqe_hdr->aura = sq->aura_id;
>  		/* Post a CQE Tx after pkt transmission */
>  		sqe_hdr->pnc = 1;
> -		sqe_hdr->sq = qidx;
> +		if (pfvf->hw.tx_queues == qidx)
> +			sqe_hdr->sq = qidx + pfvf->hw.xdp_queues;
> +		else
> +			sqe_hdr->sq = qidx;

nit: maybe this is nicer? *completely untested!*

		sqe_hdr = pfvf->hw.tx_queues != qidx ?
			  qidx + pfvf->hw.xdp_queues : qidx;

...