netdev - Re: [PATCH net-next v2 7/7] net: ti: icssg-prueth: Enable HSR Tx Tag and Rx Tag offload

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Message-ID: <cfb025a4-41a4-448f-a7a8-7ce14f8532f5@ti.com>
Date: Thu, 22 Aug 2024 13:33:34 +0530
From: MD Danish Anwar <danishanwar@...com>
To: Roger Quadros <rogerq@...nel.org>,
        Dan Carpenter
	<dan.carpenter@...aro.org>,
        Andrew Lunn <andrew@...n.ch>, Jan Kiszka
	<jan.kiszka@...mens.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Javier
 Carrasco <javier.carrasco.cruz@...il.com>,
        Jacob Keller
	<jacob.e.keller@...el.com>,
        Diogo Ivo <diogo.ivo@...mens.com>, Simon Horman
	<horms@...nel.org>,
        Richard Cochran <richardcochran@...il.com>,
        Paolo Abeni
	<pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet
	<edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
CC: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>
Subject: Re: [PATCH net-next v2 7/7] net: ti: icssg-prueth: Enable HSR Tx Tag
 and Rx Tag offload



On 21/08/24 5:45 pm, Roger Quadros wrote:
> 
> 
> On 13/08/2024 10:42, MD Danish Anwar wrote:
>> From: Ravi Gunasekaran <r-gunasekaran@...com>
>>
>> Add support to offload HSR Tx Tag Insertion and Rx Tag Removal
>> and duplicate discard.
> 
> I can see code for Tx Tag insertion and RX tag removal.
> Where are you doing duplicate discard in this patch?
> 

Roger, duplicate discard is done as part of RX tag removal and it is
done by firmware.
When driver sends the command ICSSG_EMAC_HSR_RX_OFFLOAD_ENABLE, firmware
does RX tag removal as well as duplicate discard.

Maybe I can modify the commit message to stated that duplicate discard
is done as part of rx tag removal?

>>
>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
>> ---
>>  drivers/net/ethernet/ti/icssg/icssg_common.c |  3 +++
>>  drivers/net/ethernet/ti/icssg/icssg_config.c |  4 +++-
>>  drivers/net/ethernet/ti/icssg/icssg_config.h |  2 ++
>>  drivers/net/ethernet/ti/icssg/icssg_prueth.c | 11 ++++++++++-
>>  drivers/net/ethernet/ti/icssg/icssg_prueth.h |  1 +
>>  5 files changed, 19 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
>> index 2d6d8648f5a9..4eae4f9250c0 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_common.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
>> @@ -721,6 +721,9 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
>>  	if (prueth->is_hsr_offload_mode && (ndev->features & NETIF_F_HW_HSR_DUP))
>>  		dst_tag_id = PRUETH_UNDIRECTED_PKT_DST_TAG;
>>  
>> +	if (prueth->is_hsr_offload_mode && (ndev->features & NETIF_F_HW_HSR_TAG_INS))
>> +		epib[1] |= PRUETH_UNDIRECTED_PKT_TAG_INS;
>> +
>>  	cppi5_desc_set_tags_ids(&first_desc->hdr, 0, dst_tag_id);
>>  	k3_udma_glue_tx_dma_to_cppi5_addr(tx_chn->tx_chn, &buf_dma);
>>  	cppi5_hdesc_attach_buf(first_desc, buf_dma, pkt_len, buf_dma, pkt_len);
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.c b/drivers/net/ethernet/ti/icssg/icssg_config.c
>> index 2f485318c940..f061fa97a377 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_config.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_config.c
>> @@ -531,7 +531,9 @@ static const struct icssg_r30_cmd emac_r32_bitmask[] = {
>>  	{{EMAC_NONE,  0xffff4000, EMAC_NONE, EMAC_NONE}},	/* Preemption on Tx ENABLE*/
>>  	{{EMAC_NONE,  0xbfff0000, EMAC_NONE, EMAC_NONE}},	/* Preemption on Tx DISABLE*/
>>  	{{0xffff0010,  EMAC_NONE, 0xffff0010, EMAC_NONE}},	/* VLAN AWARE*/
>> -	{{0xffef0000,  EMAC_NONE, 0xffef0000, EMAC_NONE}}	/* VLAN UNWARE*/
>> +	{{0xffef0000,  EMAC_NONE, 0xffef0000, EMAC_NONE}},	/* VLAN UNWARE*/
>> +	{{0xffff2000, EMAC_NONE, EMAC_NONE, EMAC_NONE}},	/* HSR_RX_OFFLOAD_ENABLE */
>> +	{{0xdfff0000, EMAC_NONE, EMAC_NONE, EMAC_NONE}}		/* HSR_RX_OFFLOAD_DISABLE */
>>  };
>>  
>>  int icssg_set_port_state(struct prueth_emac *emac,
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.h b/drivers/net/ethernet/ti/icssg/icssg_config.h
>> index 1ac60283923b..92c2deaa3068 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_config.h
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_config.h
>> @@ -80,6 +80,8 @@ enum icssg_port_state_cmd {
>>  	ICSSG_EMAC_PORT_PREMPT_TX_DISABLE,
>>  	ICSSG_EMAC_PORT_VLAN_AWARE_ENABLE,
>>  	ICSSG_EMAC_PORT_VLAN_AWARE_DISABLE,
>> +	ICSSG_EMAC_HSR_RX_OFFLOAD_ENABLE,
>> +	ICSSG_EMAC_HSR_RX_OFFLOAD_DISABLE,
>>  	ICSSG_EMAC_PORT_MAX_COMMANDS
>>  };
>>  
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
>> index 521e9f914459..582e72dd8f3f 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
>> @@ -42,7 +42,9 @@
>>  #define DEFAULT_UNTAG_MASK	1
>>  
>>  #define NETIF_PRUETH_HSR_OFFLOAD	(NETIF_F_HW_HSR_FWD | \
>> -					 NETIF_F_HW_HSR_DUP)
>> +					 NETIF_F_HW_HSR_DUP | \
>> +					 NETIF_F_HW_HSR_TAG_INS | \
>> +					 NETIF_F_HW_HSR_TAG_RM)
>>  
>>  /* CTRLMMR_ICSSG_RGMII_CTRL register bits */
>>  #define ICSSG_CTRL_RGMII_ID_MODE                BIT(24)
>> @@ -1032,6 +1034,13 @@ static void icssg_change_mode(struct prueth *prueth)
>>  
>>  	for (mac = PRUETH_MAC0; mac < PRUETH_NUM_MACS; mac++) {
>>  		emac = prueth->emac[mac];
>> +		if (prueth->is_hsr_offload_mode) {
>> +			if (emac->ndev->features & NETIF_F_HW_HSR_TAG_RM)
>> +				icssg_set_port_state(emac, ICSSG_EMAC_HSR_RX_OFFLOAD_ENABLE);

Duplicate discard is done here ^^^^

>> +			else
>> +				icssg_set_port_state(emac, ICSSG_EMAC_HSR_RX_OFFLOAD_DISABLE);
>> +		}
>> +
>>  		if (netif_running(emac->ndev)) {
>>  			icssg_fdb_add_del(emac, eth_stp_addr, prueth->default_vlan,
>>  					  ICSSG_FDB_ENTRY_P0_MEMBERSHIP |
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
>> index 6cb1dce8b309..246f1e41c13a 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
>> @@ -58,6 +58,7 @@
>>  #define IEP_DEFAULT_CYCLE_TIME_NS	1000000	/* 1 ms */
>>  
>>  #define PRUETH_UNDIRECTED_PKT_DST_TAG	0
>> +#define PRUETH_UNDIRECTED_PKT_TAG_INS	BIT(30)
>>  
>>  /* Firmware status codes */
>>  #define ICSS_HS_FW_READY 0x55555555
> 

-- 
Thanks and Regards,
Danish