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

[Roger Quadros <rogerq@kernel.org>]

On 22/08/2024 11:03, MD Danish Anwar wrote:
> 
> 
> 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@ti.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?

Yes please, that will help. Thanks!

> 
>>>
>>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.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 ^^^^

Got it.

> 
>>> +			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
>>
> 

-- 
cheers,
-roger