netdev - Re: [PATCH net-next 03/13] bnxt_en: Support ethtool -n to display ether filters.

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Date: Tue, 6 Feb 2024 08:15:42 +0100
From: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
To: Michael Chan <michael.chan@...adcom.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, andrew.gospodarek@...adcom.com,
	pavan.chebbi@...adcom.com
Subject: Re: [PATCH net-next 03/13] bnxt_en: Support ethtool -n to display
 ether filters.

On Mon, Feb 05, 2024 at 02:31:52PM -0800, Michael Chan wrote:
> Implement ETHTOOL_GRXCLSRULE for the user defined ether filters.  Use
> the common functions to walk the L2 filter hash table.
> 
> Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
> Signed-off-by: Michael Chan <michael.chan@...adcom.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c     |  1 +
>  .../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 38 ++++++++++++++++++-
>  2 files changed, 38 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> index 3cc3504181c7..da298f4512b5 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -5484,6 +5484,7 @@ static int bnxt_init_l2_filter(struct bnxt *bp, struct bnxt_l2_filter *fltr,
>  		if (bit_id < 0)
>  			return -ENOMEM;
>  		fltr->base.sw_id = (u16)bit_id;
> +		bp->ntp_fltr_count++;
>  	}
>  	head = &bp->l2_fltr_hash_tbl[idx];
>  	hlist_add_head_rcu(&fltr->base.hash, head);
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> index 2d8e847e8fdd..4d4dd2b231b8 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
> @@ -1058,11 +1058,17 @@ static struct bnxt_filter_base *bnxt_get_one_fltr_rcu(struct bnxt *bp,
>  static int bnxt_grxclsrlall(struct bnxt *bp, struct ethtool_rxnfc *cmd,
>  			    u32 *rule_locs)
>  {
> +	u32 count;
> +
>  	cmd->data = bp->ntp_fltr_count;
>  	rcu_read_lock();
> +	count = bnxt_get_all_fltr_ids_rcu(bp, bp->l2_fltr_hash_tbl,
> +					  BNXT_L2_FLTR_HASH_SIZE, rule_locs, 0,
> +					  cmd->rule_cnt);
>  	cmd->rule_cnt = bnxt_get_all_fltr_ids_rcu(bp, bp->ntp_fltr_hash_tbl,
>  						  BNXT_NTP_FLTR_HASH_SIZE,
> -						  rule_locs, 0, cmd->rule_cnt);
> +						  rule_locs, count,
> +						  cmd->rule_cnt);
>  	rcu_read_unlock();
>  
>  	return 0;
> @@ -1081,6 +1087,36 @@ static int bnxt_grxclsrule(struct bnxt *bp, struct ethtool_rxnfc *cmd)
>  		return rc;
>  
>  	rcu_read_lock();
> +	fltr_base = bnxt_get_one_fltr_rcu(bp, bp->l2_fltr_hash_tbl,
> +					  BNXT_L2_FLTR_HASH_SIZE,
> +					  fs->location);
> +	if (fltr_base) {
> +		struct ethhdr *h_ether = &fs->h_u.ether_spec;
> +		struct ethhdr *m_ether = &fs->m_u.ether_spec;
> +		struct bnxt_l2_filter *l2_fltr;
> +		struct bnxt_l2_key *l2_key;
> +
> +		l2_fltr = container_of(fltr_base, struct bnxt_l2_filter, base);
> +		l2_key = &l2_fltr->l2_key;
> +		fs->flow_type = ETHER_FLOW;
> +		ether_addr_copy(h_ether->h_dest, l2_key->dst_mac_addr);
> +		eth_broadcast_addr(m_ether->h_dest);
> +		if (l2_key->vlan) {
> +			struct ethtool_flow_ext *m_ext = &fs->m_ext;
> +			struct ethtool_flow_ext *h_ext = &fs->h_ext;
> +
> +			fs->flow_type |= FLOW_EXT;
> +			m_ext->vlan_tci = htons(0xfff);
> +			h_ext->vlan_tci = htons(l2_key->vlan);
> +		}
> +		if (fltr_base->flags & BNXT_ACT_RING_DST)
> +			fs->ring_cookie = fltr_base->rxq;
> +		if (fltr_base->flags & BNXT_ACT_FUNC_DST)
> +			fs->ring_cookie = (u64)(fltr_base->vf_idx + 1) <<
> +					  ETHTOOL_RX_FLOW_SPEC_RING_VF_OFF;
Wonder if saving ring_cookie in fltr_base won't be cleaner, but I am not
sure if it is worth to introduce new field for only that.

> +		rcu_read_unlock();
> +		return 0;
> +	}
>  	fltr_base = bnxt_get_one_fltr_rcu(bp, bp->ntp_fltr_hash_tbl,
>  					  BNXT_NTP_FLTR_HASH_SIZE,
>  					  fs->location);

Reviewed-by: Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>

Thanks,
Michal
> -- 
> 2.30.1
>