Re: [PATCH net-next v5 4/5] net: ti: icssg-prueth: Enable HSR Tx duplication, Tx Tag and Rx Tag offload

From: Anwar, Md Danish
Date: Tue Sep 10 2024 - 13:53:56 EST

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Hi Roger,

On 9/10/2024 11:08 PM, Roger Quadros wrote:
>
>
> On 06/09/2024 14:15, MD Danish Anwar wrote:
>> From: Ravi Gunasekaran <r-gunasekaran@xxxxxx>
>>
>> The HSR stack allows to offload its Tx packet duplication functionality to
>> the hardware. Enable this offloading feature for ICSSG driver. Add support
>> to offload HSR Tx Tag Insertion and Rx Tag Removal and duplicate discard.
>>
>> Inorder to enable hsr-tag-ins-offload, hsr-dup-offload must also be enabled
>
> "In order"
>
>> as these are tightly coupled in the firmware implementation.
>>
>> Duplicate discard is done as part of RX tag removal and it is
>> done by the firmware. When driver sends the r30 command
>> ICSSG_EMAC_HSR_RX_OFFLOAD_ENABLE, firmware does RX tag removal as well as
>> duplicate discard.
>>
>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@xxxxxx>
>> Signed-off-by: MD Danish Anwar <danishanwar@xxxxxx>
>> ---
>> drivers/net/ethernet/ti/icssg/icssg_common.c | 18 ++++++++++---
>> 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 | 28 +++++++++++++++++++-
>> drivers/net/ethernet/ti/icssg/icssg_prueth.h | 3 +++
>> 5 files changed, 50 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c
>> index b9d8a93d1680..fdebeb2f84e0 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_common.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_common.c
>> @@ -660,14 +660,15 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
>> {
>> struct cppi5_host_desc_t *first_desc, *next_desc, *cur_desc;
>> struct prueth_emac *emac = netdev_priv(ndev);
>> + struct prueth *prueth = emac->prueth;
>> struct netdev_queue *netif_txq;
>> struct prueth_tx_chn *tx_chn;
>> dma_addr_t desc_dma, buf_dma;
>> + u32 pkt_len, dst_tag_id;
>> int i, ret = 0, q_idx;
>> bool in_tx_ts = 0;
>> int tx_ts_cookie;
>> void **swdata;
>> - u32 pkt_len;
>> u32 *epib;
>>
>> pkt_len = skb_headlen(skb);
>> @@ -712,9 +713,20 @@ enum netdev_tx icssg_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev
>>
>> /* set dst tag to indicate internal qid at the firmware which is at
>> * bit8..bit15. bit0..bit7 indicates port num for directed
>> - * packets in case of switch mode operation
>> + * packets in case of switch mode operation and port num 0
>> + * for undirected packets in case of HSR offload mode
>> */
>> - cppi5_desc_set_tags_ids(&first_desc->hdr, 0, (emac->port_id | (q_idx << 8)));
>> + dst_tag_id = emac->port_id | (q_idx << 8);
>> +
>> + 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);
>> swdata = cppi5_hdesc_get_swdata(first_desc);
>> diff --git a/drivers/net/ethernet/ti/icssg/icssg_config.c b/drivers/net/ethernet/ti/icssg/icssg_config.c
>> index 7b2e6c192ff3..72ace151d8e9 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 676168d6fded..9af06454ba64 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
>> @@ -41,7 +41,10 @@
>> #define DEFAULT_PORT_MASK 1
>> #define DEFAULT_UNTAG_MASK 1
>>
>> -#define NETIF_PRUETH_HSR_OFFLOAD_FEATURES NETIF_F_HW_HSR_FWD
>> +#define NETIF_PRUETH_HSR_OFFLOAD_FEATURES (NETIF_F_HW_HSR_FWD | \
>> + 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)
>> @@ -758,6 +761,21 @@ static void emac_change_hsr_feature(struct net_device *ndev,
>> }
>> }
>>
>> +static netdev_features_t emac_ndo_fix_features(struct net_device *ndev,
>> + netdev_features_t features)
>> +{
>> + /* In order to enable hsr tag insertion offload, hsr dup offload must
>> + * also be enabled as these two are tightly coupled in firmware
>> + * implementation.
>> + */
>> + if (features & NETIF_F_HW_HSR_TAG_INS)
>> + features |= NETIF_F_HW_HSR_DUP;
>
> What if only NETIF_F_HW_HSR_DUP was set? Don't you have to set NETIF_F_HW_HSR_TAG_INS as well?
>
>> + else
>> + features &= ~NETIF_F_HW_HSR_DUP;
>
> what if NETIF_F_HW_HSR_DUP was still set?
>
> I think you need to write a logic like follows.
> if both are already cleared in ndev->features and any one is set in features you set both in features.
> if both are already set in ndev->features and any one is cleared in features you clear both in features.
>
> is this reasonable?
>

Yes that does sound reasonable,
How does below code look to you.

if (!(ndev->features & NETIF_F_HW_HSR_DUP) &&
!(ndev->features & NETIF_F_HW_HSR_TAG_INS))
if ((features & NETIF_F_HW_HSR_DUP) ||
(features & NETIF_F_HW_HSR_TAG_INS)) {
features |= NETIF_F_HW_HSR_DUP;
features |= NETIF_F_HW_HSR_TAG_INS;
}

if ((ndev->features & NETIF_F_HW_HSR_DUP) &&
(ndev->features & NETIF_F_HW_HSR_TAG_INS))
if (!(features & NETIF_F_HW_HSR_DUP) ||
!(features & NETIF_F_HW_HSR_TAG_INS)) {
features &= ~NETIF_F_HW_HSR_DUP;
features &= ~NETIF_F_HW_HSR_TAG_INS;
}

>> +
>> + return features;
>> +}
>> +
>> static int emac_ndo_set_features(struct net_device *ndev,
>> netdev_features_t features)
>> {
>> @@ -780,6 +798,7 @@ static const struct net_device_ops emac_netdev_ops = {
>> .ndo_eth_ioctl = icssg_ndo_ioctl,
>> .ndo_get_stats64 = icssg_ndo_get_stats64,
>> .ndo_get_phys_port_name = icssg_ndo_get_phys_port_name,
>> + .ndo_fix_features = emac_ndo_fix_features,
>> .ndo_set_features = emac_ndo_set_features,
>> };
>>
>> @@ -1007,6 +1026,13 @@ 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);
>> + 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 a4b025fae797..bba6da2e6bd8 100644
>> --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h
>> +++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.h
>> @@ -59,6 +59,9 @@
>>
>> #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
>> #define ICSS_HS_FW_DEAD 0xDEAD0000 /* lower 16 bits contain error code */
>

--
Thanks and Regards,
Md Danish Anwar

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In reply to: Roger Quadros: "Re: [PATCH net-next v5 4/5] net: ti: icssg-prueth: Enable HSR Tx duplication, Tx Tag and Rx Tag offload"
Next in thread: Roger Quadros: "Re: [PATCH net-next v5 4/5] net: ti: icssg-prueth: Enable HSR Tx duplication, Tx Tag and Rx Tag offload"
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