[PATCH v2] net/e1000: support launchtime feature
Zhang, Qi Z
qi.z.zhang at intel.com
Fri Jan 5 01:51:24 CET 2024
> -----Original Message-----
> From: Su, Simei <simei.su at intel.com>
> Sent: Thursday, January 4, 2024 11:13 AM
> To: Chuanyu Xue <chuanyu.xue at uconn.edu>; Lu, Wenzhuo
> <wenzhuo.lu at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>; Xing, Beilei
> <beilei.xing at intel.com>
> Cc: dev at dpdk.org
> Subject: RE: [PATCH v2] net/e1000: support launchtime feature
>
>
> > -----Original Message-----
> > From: Chuanyu Xue <chuanyu.xue at uconn.edu>
> > Sent: Sunday, December 31, 2023 12:35 AM
> > To: Su, Simei <simei.su at intel.com>; Lu, Wenzhuo
> > <wenzhuo.lu at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>; Xing,
> > Beilei <beilei.xing at intel.com>
> > Cc: dev at dpdk.org; Chuanyu Xue <chuanyu.xue at uconn.edu>
> > Subject: [PATCH v2] net/e1000: support launchtime feature
> >
> > Enable the time-based scheduled Tx of packets based on the
> > RTE_ETH_TX_OFFLOAD_SEND_ON_TIMESTAMP flag. The launchtime defines
> the
> > packet transmission time based on PTP clock at MAC layer, which should
> > be set to the advanced transmit descriptor.
> >
> > Signed-off-by: Chuanyu Xue <chuanyu.xue at uconn.edu>
> > ---
> > change log:
> >
> > v2:
> > - Add delay compensation for i210 NIC by setting tx offset register.
> > - Revise read_clock function.
> >
> > drivers/net/e1000/base/e1000_regs.h | 1 +
> > drivers/net/e1000/e1000_ethdev.h | 14 +++++++
> > drivers/net/e1000/igb_ethdev.c | 63
> > ++++++++++++++++++++++++++++-
> > drivers/net/e1000/igb_rxtx.c | 42 +++++++++++++++----
> > 4 files changed, 112 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/net/e1000/base/e1000_regs.h
> > b/drivers/net/e1000/base/e1000_regs.h
> > index d44de59c29..092d9d71e6 100644
> > --- a/drivers/net/e1000/base/e1000_regs.h
> > +++ b/drivers/net/e1000/base/e1000_regs.h
> > @@ -162,6 +162,7 @@
> >
> > /* QAV Tx mode control register */
> > #define E1000_I210_TQAVCTRL 0x3570
> > +#define E1000_I210_LAUNCH_OS0 0x3578
> >
> > /* QAV Tx mode control register bitfields masks */
> > /* QAV enable */
> > diff --git a/drivers/net/e1000/e1000_ethdev.h
> > b/drivers/net/e1000/e1000_ethdev.h
> > index 718a9746ed..339ae1f4b6 100644
> > --- a/drivers/net/e1000/e1000_ethdev.h
> > +++ b/drivers/net/e1000/e1000_ethdev.h
> > @@ -382,6 +382,20 @@ extern struct igb_rss_filter_list
> > igb_filter_rss_list; TAILQ_HEAD(igb_flow_mem_list, igb_flow_mem);
> > extern struct igb_flow_mem_list igb_flow_list;
> >
> > +/*
> > + * Macros to compensate the constant latency observed in i210 for
> > +launch time
> > + *
> > + * launch time = (offset_speed - offset_base + txtime) * 32
> > + * offset_speed is speed dependent, set in E1000_I210_LAUNCH_OS0 */
> > +#define IGB_I210_TX_OFFSET_BASE 0xffe0
> > +#define IGB_I210_TX_OFFSET_SPEED_10 0xc7a0
> > +#define IGB_I210_TX_OFFSET_SPEED_100 0x86e0
> > +#define IGB_I210_TX_OFFSET_SPEED_1000 0xbe00
> > +
> > +extern uint64_t igb_tx_timestamp_dynflag; extern int
> > +igb_tx_timestamp_dynfield_offset;
> > +
> > extern const struct rte_flow_ops igb_flow_ops;
> >
> > /*
> > diff --git a/drivers/net/e1000/igb_ethdev.c
> > b/drivers/net/e1000/igb_ethdev.c index 8858f975f8..2262035710 100644
> > --- a/drivers/net/e1000/igb_ethdev.c
> > +++ b/drivers/net/e1000/igb_ethdev.c
> > @@ -223,6 +223,7 @@ static int igb_timesync_read_time(struct
> > rte_eth_dev *dev,
> > struct timespec *timestamp);
> > static int igb_timesync_write_time(struct rte_eth_dev *dev,
> > const struct timespec *timestamp);
> > +static int eth_igb_read_clock(struct rte_eth_dev *dev, uint64_t
> > +*clock);
> > static int eth_igb_rx_queue_intr_enable(struct rte_eth_dev *dev,
> > uint16_t queue_id);
> > static int eth_igb_rx_queue_intr_disable(struct rte_eth_dev *dev, @@
> > -313,6
> > +314,9 @@ static const struct rte_pci_id pci_id_igbvf_map[] = {
> > { .vendor_id = 0, /* sentinel */ },
> > };
> >
> > +uint64_t igb_tx_timestamp_dynflag;
> > +int igb_tx_timestamp_dynfield_offset = -1;
> > +
> > static const struct rte_eth_desc_lim rx_desc_lim = {
> > .nb_max = E1000_MAX_RING_DESC,
> > .nb_min = E1000_MIN_RING_DESC,
> > @@ -389,6 +393,7 @@ static const struct eth_dev_ops eth_igb_ops = {
> > .timesync_adjust_time = igb_timesync_adjust_time,
> > .timesync_read_time = igb_timesync_read_time,
> > .timesync_write_time = igb_timesync_write_time,
> > + .read_clock = eth_igb_read_clock,
> > };
> >
> > /*
> > @@ -1188,6 +1193,40 @@ eth_igb_rxtx_control(struct rte_eth_dev *dev,
> > E1000_WRITE_FLUSH(hw);
> > }
> >
> > +
> > +static uint32_t igb_tx_offset(struct rte_eth_dev *dev) {
> > + struct e1000_hw *hw =
> > + E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> > +
> > + uint16_t duplex, speed;
> > + hw->mac.ops.get_link_up_info(hw, &speed, &duplex);
> > +
> > + uint32_t launch_os0 = E1000_READ_REG(hw,
> E1000_I210_LAUNCH_OS0);
> > + if (hw->mac.type != e1000_i210) {
> > + /* Set launch offset to base, no compensation */
> > + launch_os0 |= IGB_I210_TX_OFFSET_BASE;
> > + } else {
> > + /* Set launch offset depend on link speeds */
> > + switch (speed) {
> > + case SPEED_10:
> > + launch_os0 |= IGB_I210_TX_OFFSET_SPEED_10;
> > + break;
> > + case SPEED_100:
> > + launch_os0 |= IGB_I210_TX_OFFSET_SPEED_100;
> > + break;
> > + case SPEED_1000:
> > + launch_os0 |= IGB_I210_TX_OFFSET_SPEED_1000;
> > + break;
> > + default:
> > + launch_os0 |= IGB_I210_TX_OFFSET_BASE;
> > + break;
> > + }
> > + }
> > +
> > + return launch_os0;
> > +}
> > +
> > static int
> > eth_igb_start(struct rte_eth_dev *dev) { @@ -1198,6 +1237,7 @@
> > eth_igb_start(struct rte_eth_dev *dev)
> > struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
> > struct rte_intr_handle *intr_handle = pci_dev->intr_handle;
> > int ret, mask;
> > + uint32_t tqavctrl;
> > uint32_t intr_vector = 0;
> > uint32_t ctrl_ext;
> > uint32_t *speeds;
> > @@ -1273,6 +1313,15 @@ eth_igb_start(struct rte_eth_dev *dev)
> >
> > eth_igb_tx_init(dev);
> >
> > + if (igb_tx_timestamp_dynflag > 0) {
> > + tqavctrl = E1000_READ_REG(hw, E1000_I210_TQAVCTRL);
> > + tqavctrl |= E1000_TQAVCTRL_MODE; /* Enable Qav mode */
> > + tqavctrl |= E1000_TQAVCTRL_FETCH_ARB; /* ARB fetch, no
> Round
> > Robin*/
> > + tqavctrl |= E1000_TQAVCTRL_LAUNCH_TIMER_ENABLE; /*
> Enable Tx
> > launch time*/
> > + E1000_WRITE_REG(hw, E1000_I210_TQAVCTRL, tqavctrl);
> > + E1000_WRITE_REG(hw, E1000_I210_LAUNCH_OS0,
> > igb_tx_offset(dev));
> > + }
> > +
> > /* This can fail when allocating mbufs for descriptor rings */
> > ret = eth_igb_rx_init(dev);
> > if (ret) {
> > @@ -1393,7 +1442,6 @@ eth_igb_start(struct rte_eth_dev *dev)
> >
> > eth_igb_rxtx_control(dev, true);
> > eth_igb_link_update(dev, 0);
> > -
> > PMD_INIT_LOG(DEBUG, "<<");
> >
> > return 0;
> > @@ -4882,6 +4930,19 @@ igb_timesync_read_tx_timestamp(struct
> > rte_eth_dev *dev,
> > return 0;
> > }
> >
> > +static int
> > +eth_igb_read_clock(struct rte_eth_dev *dev, uint64_t *clock) {
> > + struct e1000_adapter *adapter = dev->data->dev_private;
> > + struct rte_timecounter *tc = &adapter->systime_tc;
> > + uint64_t cycles;
> > +
> > + cycles = igb_read_systime_cyclecounter(dev);
> > + *clock = rte_timecounter_update(tc, cycles);
> > +
> > + return 0;
> > +}
> > +
> > static int
> > eth_igb_get_reg_length(struct rte_eth_dev *dev __rte_unused) { diff
> > --git a/drivers/net/e1000/igb_rxtx.c b/drivers/net/e1000/igb_rxtx.c
> > index 448c4b7d9d..5cafd6f1ce 100644
> > --- a/drivers/net/e1000/igb_rxtx.c
> > +++ b/drivers/net/e1000/igb_rxtx.c
> > @@ -244,12 +244,13 @@ check_tso_para(uint64_t ol_req, union
> > igb_tx_offload ol_para) static inline void igbe_set_xmit_ctx(struct
> > igb_tx_queue* txq,
> > volatile struct e1000_adv_tx_context_desc *ctx_txd,
> > - uint64_t ol_flags, union igb_tx_offload tx_offload)
> > + uint64_t ol_flags, union igb_tx_offload tx_offload, uint64_t
> > +txtime)
> > {
> > uint32_t type_tucmd_mlhl;
> > uint32_t mss_l4len_idx;
> > uint32_t ctx_idx, ctx_curr;
> > uint32_t vlan_macip_lens;
> > + uint32_t launch_time;
> > union igb_tx_offload tx_offload_mask;
> >
> > ctx_curr = txq->ctx_curr;
> > @@ -312,16 +313,25 @@ igbe_set_xmit_ctx(struct igb_tx_queue* txq,
> > }
> > }
> >
> > - txq->ctx_cache[ctx_curr].flags = ol_flags;
> > - txq->ctx_cache[ctx_curr].tx_offload.data =
> > - tx_offload_mask.data & tx_offload.data;
> > - txq->ctx_cache[ctx_curr].tx_offload_mask = tx_offload_mask;
> > + if (!txtime) {
> > + txq->ctx_cache[ctx_curr].flags = ol_flags;
> > + txq->ctx_cache[ctx_curr].tx_offload.data =
> > + tx_offload_mask.data & tx_offload.data;
> > + txq->ctx_cache[ctx_curr].tx_offload_mask = tx_offload_mask;
> > + }
> >
> > ctx_txd->type_tucmd_mlhl = rte_cpu_to_le_32(type_tucmd_mlhl);
> > vlan_macip_lens = (uint32_t)tx_offload.data;
> > ctx_txd->vlan_macip_lens = rte_cpu_to_le_32(vlan_macip_lens);
> > ctx_txd->mss_l4len_idx = rte_cpu_to_le_32(mss_l4len_idx);
> > ctx_txd->u.seqnum_seed = 0;
> > +
> > + if (txtime) {
> > + launch_time = (txtime - IGB_I210_TX_OFFSET_BASE) %
> > NSEC_PER_SEC;
> > + ctx_txd->u.launch_time = rte_cpu_to_le_32(launch_time /
> 32);
> > + } else {
> > + ctx_txd->u.launch_time = 0;
> > + }
> > }
> >
> > /*
> > @@ -400,6 +410,7 @@ eth_igb_xmit_pkts(void *tx_queue, struct rte_mbuf
> > **tx_pkts,
> > uint32_t new_ctx = 0;
> > uint32_t ctx = 0;
> > union igb_tx_offload tx_offload = {0};
> > + uint64_t ts;
> >
> > txq = tx_queue;
> > sw_ring = txq->sw_ring;
> > @@ -552,7 +563,13 @@ eth_igb_xmit_pkts(void *tx_queue, struct
> rte_mbuf
> > **tx_pkts,
> > txe->mbuf = NULL;
> > }
> >
> > - igbe_set_xmit_ctx(txq, ctx_txd, tx_ol_req,
> tx_offload);
> > + if (igb_tx_timestamp_dynflag > 0) {
> > + ts = *RTE_MBUF_DYNFIELD(tx_pkt,
> > +
> igb_tx_timestamp_dynfield_offset, uint64_t *);
> > + igbe_set_xmit_ctx(txq, ctx_txd,
> tx_ol_req, tx_offload,
> > ts);
> > + } else {
> > + igbe_set_xmit_ctx(txq, ctx_txd,
> tx_ol_req, tx_offload,
> > 0);
> > + }
> >
> > txe->last_id = tx_last;
> > tx_id = txe->next_id;
> > @@ -1464,7 +1481,8 @@ igb_get_tx_port_offloads_capa(struct
> rte_eth_dev
> > *dev)
> > RTE_ETH_TX_OFFLOAD_TCP_CKSUM |
> > RTE_ETH_TX_OFFLOAD_SCTP_CKSUM |
> > RTE_ETH_TX_OFFLOAD_TCP_TSO |
> > - RTE_ETH_TX_OFFLOAD_MULTI_SEGS;
> > + RTE_ETH_TX_OFFLOAD_MULTI_SEGS |
> > + RTE_ETH_TX_OFFLOAD_SEND_ON_TIMESTAMP;
> >
> > return tx_offload_capa;
> > }
> > @@ -2579,9 +2597,11 @@ eth_igb_tx_init(struct rte_eth_dev *dev) {
> > struct e1000_hw *hw;
> > struct igb_tx_queue *txq;
> > + uint64_t offloads = dev->data->dev_conf.txmode.offloads;
> > uint32_t tctl;
> > uint32_t txdctl;
> > uint16_t i;
> > + int err;
> >
> > hw = E1000_DEV_PRIVATE_TO_HW(dev->data->dev_private);
> >
> > @@ -2612,6 +2632,14 @@ eth_igb_tx_init(struct rte_eth_dev *dev)
> > dev->data->tx_queue_state[i] =
> RTE_ETH_QUEUE_STATE_STARTED;
> > }
> >
> > + if (offloads & RTE_ETH_TX_OFFLOAD_SEND_ON_TIMESTAMP) {
> > + err = rte_mbuf_dyn_tx_timestamp_register(
> > + &igb_tx_timestamp_dynfield_offset,
> > + &igb_tx_timestamp_dynflag);
> > + if (err)
> > + PMD_DRV_LOG(ERR, "Failed to register tx timestamp
> dynamic
> > field");
> > + }
> > +
> > /* Program the Transmit Control Register. */
> > tctl = E1000_READ_REG(hw, E1000_TCTL);
> > tctl &= ~E1000_TCTL_CT;
> > --
> > 2.25.1
>
> Reviewed-by: Simei Su <simei.su at intel.com>
Applied to dpdk-next-net-intel.
Thanks
Qi
>
> Thanks,
> Simei
More information about the dev
mailing list