linux-kernel - Re: [v7, net-next 03/10] bng_en: Add initial support for CP and NQ rings

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Message-ID: <20250916145457.GH224143@horms.kernel.org>
Date: Tue, 16 Sep 2025 15:54:57 +0100
From: Simon Horman <horms@...nel.org>
To: Bhargava Marreddy <bhargava.marreddy@...adcom.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, andrew+netdev@...n.ch, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.chan@...adcom.com,
	pavan.chebbi@...adcom.com, vsrama-krishna.nemani@...adcom.com,
	vikas.gupta@...adcom.com,
	Rajashekar Hudumula <rajashekar.hudumula@...adcom.com>
Subject: Re: [v7, net-next 03/10] bng_en: Add initial support for CP and NQ
 rings

On Fri, Sep 12, 2025 at 01:04:58AM +0530, Bhargava Marreddy wrote:
> Allocate CP and NQ related data structures and add support to
> associate NQ and CQ rings. Also, add the association of NQ, NAPI,
> and interrupts.
> 
> Signed-off-by: Bhargava Marreddy <bhargava.marreddy@...adcom.com>
> Reviewed-by: Vikas Gupta <vikas.gupta@...adcom.com>
> Reviewed-by: Rajashekar Hudumula <rajashekar.hudumula@...adcom.com>

...

> +static int bnge_alloc_nq_tree(struct bnge_net *bn)
> +{
> +	int i, j, ulp_msix, rc = -ENOMEM;
> +	struct bnge_dev *bd = bn->bd;
> +	int tcs = 1;
> +
> +	ulp_msix = bnge_aux_get_msix(bd);
> +	for (i = 0, j = 0; i < bd->nq_nr_rings; i++) {
> +		bool sh = !!(bd->flags & BNGE_EN_SHARED_CHNL);
> +		struct bnge_napi *bnapi = bn->bnapi[i];
> +		struct bnge_nq_ring_info *nqr;
> +		struct bnge_cp_ring_info *cpr;
> +		struct bnge_ring_struct *ring;
> +		int cp_count = 0, k;
> +		int rx = 0, tx = 0;
> +
> +		nqr = &bnapi->nq_ring;
> +		nqr->bnapi = bnapi;
> +		ring = &nqr->ring_struct;
> +
> +		rc = bnge_alloc_ring(bd, &ring->ring_mem);
> +		if (rc)
> +			goto err_free_nq_tree;
> +
> +		ring->map_idx = ulp_msix + i;
> +
> +		if (i < bd->rx_nr_rings) {
> +			cp_count++;
> +			rx = 1;
> +		}
> +
> +		if ((sh && i < bd->tx_nr_rings) ||
> +		    (!sh && i >= bd->rx_nr_rings)) {
> +			cp_count += tcs;
> +			tx = 1;
> +		}
> +
> +		nqr->cp_ring_arr = kcalloc(cp_count, sizeof(*cpr),
> +					   GFP_KERNEL);
> +		if (!nqr->cp_ring_arr)

I think that rc should be set to a negative return value, say -ENOMEM,
here. The function returns rc. And as is, rc is 0 at this point.

Flagged by Smatch.

> +			goto err_free_nq_tree;
> +
> +		nqr->cp_ring_count = cp_count;
> +
> +		for (k = 0; k < cp_count; k++) {
> +			cpr = &nqr->cp_ring_arr[k];
> +			rc = alloc_one_cp_ring(bn, cpr);
> +			if (rc)
> +				goto err_free_nq_tree;
> +
> +			cpr->bnapi = bnapi;
> +			cpr->cp_idx = k;
> +			if (!k && rx) {
> +				bn->rx_ring[i].rx_cpr = cpr;
> +				cpr->cp_ring_type = BNGE_NQ_HDL_TYPE_RX;
> +			} else {
> +				int n, tc = k - rx;
> +
> +				n = BNGE_TC_TO_RING_BASE(bd, tc) + j;
> +				bn->tx_ring[n].tx_cpr = cpr;
> +				cpr->cp_ring_type = BNGE_NQ_HDL_TYPE_TX;
> +			}
> +		}
> +		if (tx)
> +			j++;
> +	}
> +	return 0;
> +
> +err_free_nq_tree:
> +	bnge_free_nq_tree(bn);
> +	return rc;
> +}
> +
>  static bool bnge_separate_head_pool(struct bnge_rx_ring_info *rxr)
>  {
>  	return rxr->need_head_pool || PAGE_SIZE > BNGE_RX_PAGE_SIZE;