From 9217c3cf84d736bffe674a5fc3722cd9a8ef8898 Mon Sep 17 00:00:00 2001 From: Raghu Vatsavayi Date: Wed, 7 Dec 2016 08:54:37 -0800 Subject: [PATCH] liquidio VF rx data and ctl path Adds support for VF receive data control path. Signed-off-by: Raghu Vatsavayi Signed-off-by: Derek Chickles Signed-off-by: Satanand Burla Signed-off-by: Felix Manlunas Signed-off-by: David S. Miller --- .../ethernet/cavium/liquidio/lio_vf_main.c | 412 +++++++++++++++++- .../ethernet/cavium/liquidio/octeon_device.c | 2 +- .../ethernet/cavium/liquidio/octeon_droq.c | 10 + .../cavium/liquidio/response_manager.c | 3 +- 4 files changed, 423 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c index e4297f8a6e80..9989ac393e94 100644 --- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c +++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c @@ -38,6 +38,8 @@ MODULE_PARM_DESC(debug, "NETIF_MSG debug bits"); #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK) +/* Bit mask values for lio->ifstate */ +#define LIO_IFSTATE_DROQ_OPS 0x01 #define LIO_IFSTATE_REGISTERED 0x02 #define LIO_IFSTATE_RUNNING 0x04 @@ -55,6 +57,14 @@ struct liquidio_if_cfg_resp { u64 status; }; +struct liquidio_rx_ctl_context { + int octeon_id; + + wait_queue_head_t wc; + + int cond; +}; + union tx_info { u64 u64; struct { @@ -176,6 +186,16 @@ static struct pci_driver liquidio_vf_pci_driver = { .remove = liquidio_vf_remove, }; +/** + * \brief check interface state + * @param lio per-network private data + * @param state_flag flag state to check + */ +static int ifstate_check(struct lio *lio, int state_flag) +{ + return atomic_read(&lio->ifstate) & state_flag; +} + /** * \brief set interface state * @param lio per-network private data @@ -510,6 +530,31 @@ static void update_link_status(struct net_device *netdev, } } +static void update_txq_status(struct octeon_device *oct, int iq_num) +{ + struct octeon_instr_queue *iq = oct->instr_queue[iq_num]; + struct net_device *netdev; + struct lio *lio; + + netdev = oct->props[iq->ifidx].netdev; + lio = GET_LIO(netdev); + if (netif_is_multiqueue(netdev)) { + if (__netif_subqueue_stopped(netdev, iq->q_index) && + lio->linfo.link.s.link_up && + (!octnet_iq_is_full(oct, iq_num))) { + netif_wake_subqueue(netdev, iq->q_index); + INCR_INSTRQUEUE_PKT_COUNT(lio->oct_dev, iq_num, + tx_restart, 1); + } else { + if (!octnet_iq_is_full(oct, lio->txq)) { + INCR_INSTRQUEUE_PKT_COUNT( + lio->oct_dev, lio->txq, tx_restart, 1); + wake_q(netdev, lio->txq); + } + } + } +} + static int liquidio_schedule_msix_droq_pkt_handler(struct octeon_droq *droq, u64 ret) { @@ -817,6 +862,91 @@ static void octeon_destroy_resources(struct octeon_device *oct) } } +/** + * \brief Callback for rx ctrl + * @param status status of request + * @param buf pointer to resp structure + */ +static void rx_ctl_callback(struct octeon_device *oct, + u32 status, void *buf) +{ + struct octeon_soft_command *sc = (struct octeon_soft_command *)buf; + struct liquidio_rx_ctl_context *ctx; + + ctx = (struct liquidio_rx_ctl_context *)sc->ctxptr; + + oct = lio_get_device(ctx->octeon_id); + if (status) + dev_err(&oct->pci_dev->dev, "rx ctl instruction failed. Status: %llx\n", + CVM_CAST64(status)); + WRITE_ONCE(ctx->cond, 1); + + /* This barrier is required to be sure that the response has been + * written fully before waking up the handler + */ + wmb(); + + wake_up_interruptible(&ctx->wc); +} + +/** + * \brief Send Rx control command + * @param lio per-network private data + * @param start_stop whether to start or stop + */ +static void send_rx_ctrl_cmd(struct lio *lio, int start_stop) +{ + struct octeon_device *oct = (struct octeon_device *)lio->oct_dev; + int ctx_size = sizeof(struct liquidio_rx_ctl_context); + struct liquidio_rx_ctl_context *ctx; + struct octeon_soft_command *sc; + union octnet_cmd *ncmd; + int retval; + + if (oct->props[lio->ifidx].rx_on == start_stop) + return; + + sc = (struct octeon_soft_command *) + octeon_alloc_soft_command(oct, OCTNET_CMD_SIZE, + 16, ctx_size); + + ncmd = (union octnet_cmd *)sc->virtdptr; + ctx = (struct liquidio_rx_ctl_context *)sc->ctxptr; + + WRITE_ONCE(ctx->cond, 0); + ctx->octeon_id = lio_get_device_id(oct); + init_waitqueue_head(&ctx->wc); + + ncmd->u64 = 0; + ncmd->s.cmd = OCTNET_CMD_RX_CTL; + ncmd->s.param1 = start_stop; + + octeon_swap_8B_data((u64 *)ncmd, (OCTNET_CMD_SIZE >> 3)); + + sc->iq_no = lio->linfo.txpciq[0].s.q_no; + + octeon_prepare_soft_command(oct, sc, OPCODE_NIC, + OPCODE_NIC_CMD, 0, 0, 0); + + sc->callback = rx_ctl_callback; + sc->callback_arg = sc; + sc->wait_time = 5000; + + retval = octeon_send_soft_command(oct, sc); + if (retval == IQ_SEND_FAILED) { + netif_info(lio, rx_err, lio->netdev, "Failed to send RX Control message\n"); + } else { + /* Sleep on a wait queue till the cond flag indicates that the + * response arrived or timed-out. + */ + if (sleep_cond(&ctx->wc, &ctx->cond) == -EINTR) + return; + oct->props[lio->ifidx].rx_on = start_stop; + } + + octeon_free_soft_command(oct, sc); +} + /** * \brief Destroy NIC device interface * @param oct octeon device @@ -828,6 +958,7 @@ static void octeon_destroy_resources(struct octeon_device *oct) static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx) { struct net_device *netdev = oct->props[ifidx].netdev; + struct napi_struct *napi, *n; struct lio *lio; if (!netdev) { @@ -843,6 +974,15 @@ static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx) if (atomic_read(&lio->ifstate) & LIO_IFSTATE_RUNNING) liquidio_stop(netdev); + if (oct->props[lio->ifidx].napi_enabled == 1) { + list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) + napi_disable(napi); + + oct->props[lio->ifidx].napi_enabled = 0; + + oct->droq[0]->ops.poll_mode = 0; + } + if (atomic_read(&lio->ifstate) & LIO_IFSTATE_REGISTERED) unregister_netdev(netdev); @@ -863,7 +1003,8 @@ static void liquidio_destroy_nic_device(struct octeon_device *oct, int ifidx) */ static int liquidio_stop_nic_module(struct octeon_device *oct) { - int i; + struct lio *lio; + int i, j; dev_dbg(&oct->pci_dev->dev, "Stopping network interfaces\n"); if (!oct->ifcount) { @@ -871,6 +1012,17 @@ static int liquidio_stop_nic_module(struct octeon_device *oct) return 1; } + spin_lock_bh(&oct->cmd_resp_wqlock); + oct->cmd_resp_state = OCT_DRV_OFFLINE; + spin_unlock_bh(&oct->cmd_resp_wqlock); + + for (i = 0; i < oct->ifcount; i++) { + lio = GET_LIO(oct->props[i].netdev); + for (j = 0; j < lio->linfo.num_rxpciq; j++) + octeon_unregister_droq_ops(oct, + lio->linfo.rxpciq[j].s.q_no); + } + for (i = 0; i < oct->ifcount; i++) liquidio_destroy_nic_device(oct, i); @@ -1090,6 +1242,41 @@ static void free_netsgbuf_with_resp(void *buf) check_txq_state(lio, skb); } +/** + * \brief Setup output queue + * @param oct octeon device + * @param q_no which queue + * @param num_descs how many descriptors + * @param desc_size size of each descriptor + * @param app_ctx application context + */ +static int octeon_setup_droq(struct octeon_device *oct, int q_no, int num_descs, + int desc_size, void *app_ctx) +{ + int ret_val; + + dev_dbg(&oct->pci_dev->dev, "Creating Droq: %d\n", q_no); + /* droq creation and local register settings. */ + ret_val = octeon_create_droq(oct, q_no, num_descs, desc_size, app_ctx); + if (ret_val < 0) + return ret_val; + + if (ret_val == 1) { + dev_dbg(&oct->pci_dev->dev, "Using default droq %d\n", q_no); + return 0; + } + + /* Enable the droq queues */ + octeon_set_droq_pkt_op(oct, q_no, 1); + + /* Send Credit for Octeon Output queues. Credits are always + * sent after the output queue is enabled. + */ + writel(oct->droq[q_no]->max_count, oct->droq[q_no]->pkts_credit_reg); + + return ret_val; +} + /** * \brief Callback for getting interface configuration * @param status status of request @@ -1142,6 +1329,155 @@ static u16 select_q(struct net_device *dev, struct sk_buff *skb, return (u16)(qindex % (lio->linfo.num_txpciq)); } +/** Routine to push packets arriving on Octeon interface upto network layer. + * @param oct_id - octeon device id. + * @param skbuff - skbuff struct to be passed to network layer. + * @param len - size of total data received. + * @param rh - Control header associated with the packet + * @param param - additional control data with the packet + * @param arg - farg registered in droq_ops + */ +static void +liquidio_push_packet(u32 octeon_id __attribute__((unused)), + void *skbuff, + u32 len, + union octeon_rh *rh, + void *param, + void *arg) +{ + struct napi_struct *napi = param; + struct octeon_droq *droq = + container_of(param, struct octeon_droq, napi); + struct net_device *netdev = (struct net_device *)arg; + struct sk_buff *skb = (struct sk_buff *)skbuff; + + if (netdev) { + struct lio *lio = GET_LIO(netdev); + int packet_was_received; + + /* Do not proceed if the interface is not in RUNNING state. */ + if (!ifstate_check(lio, LIO_IFSTATE_RUNNING)) { + recv_buffer_free(skb); + droq->stats.rx_dropped++; + return; + } + + skb->dev = netdev; + + skb_record_rx_queue(skb, droq->q_no); + if (likely(len > MIN_SKB_SIZE)) { + struct octeon_skb_page_info *pg_info; + unsigned char *va; + + pg_info = ((struct octeon_skb_page_info *)(skb->cb)); + if (pg_info->page) { + /* For Paged allocation use the frags */ + va = page_address(pg_info->page) + + pg_info->page_offset; + memcpy(skb->data, va, MIN_SKB_SIZE); + skb_put(skb, MIN_SKB_SIZE); + skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, + pg_info->page, + pg_info->page_offset + + MIN_SKB_SIZE, + len - MIN_SKB_SIZE, + LIO_RXBUFFER_SZ); + } + } else { + struct octeon_skb_page_info *pg_info = + ((struct octeon_skb_page_info *)(skb->cb)); + skb_copy_to_linear_data(skb, + page_address(pg_info->page) + + pg_info->page_offset, len); + skb_put(skb, len); + put_page(pg_info->page); + } + + skb_pull(skb, rh->r_dh.len * 8); + skb->protocol = eth_type_trans(skb, skb->dev); + + if ((netdev->features & NETIF_F_RXCSUM) && + (rh->r_dh.csum_verified & CNNIC_CSUM_VERIFIED)) + /* checksum has already been verified */ + skb->ip_summed = CHECKSUM_UNNECESSARY; + else + skb->ip_summed = CHECKSUM_NONE; + + packet_was_received = (napi_gro_receive(napi, skb) != GRO_DROP); + + if (packet_was_received) { + droq->stats.rx_bytes_received += len; + droq->stats.rx_pkts_received++; + netdev->last_rx = jiffies; + } else { + droq->stats.rx_dropped++; + netif_info(lio, rx_err, lio->netdev, + "droq:%d error rx_dropped:%llu\n", + droq->q_no, droq->stats.rx_dropped); + } + + } else { + recv_buffer_free(skb); + } +} + +/** + * \brief callback when receive interrupt occurs and we are in NAPI mode + * @param arg pointer to octeon output queue + */ +static void liquidio_vf_napi_drv_callback(void *arg) +{ + struct octeon_droq *droq = arg; + + napi_schedule_irqoff(&droq->napi); +} + +/** + * \brief Entry point for NAPI polling + * @param napi NAPI structure + * @param budget maximum number of items to process + */ +static int liquidio_napi_poll(struct napi_struct *napi, int budget) +{ + struct octeon_instr_queue *iq; + struct octeon_device *oct; + struct octeon_droq *droq; + int tx_done = 0, iq_no; + int work_done; + + droq = container_of(napi, struct octeon_droq, napi); + oct = droq->oct_dev; + iq_no = droq->q_no; + + /* Handle Droq descriptors */ + work_done = octeon_process_droq_poll_cmd(oct, droq->q_no, + POLL_EVENT_PROCESS_PKTS, + budget); + + /* Flush the instruction queue */ + iq = oct->instr_queue[iq_no]; + if (iq) { + /* Process iq buffers with in the budget limits */ + tx_done = octeon_flush_iq(oct, iq, 1, budget); + /* Update iq read-index rather than waiting for next interrupt. + * Return back if tx_done is false. + */ + update_txq_status(oct, iq_no); + } else { + dev_err(&oct->pci_dev->dev, "%s: iq (%d) num invalid\n", + __func__, iq_no); + } + + if ((work_done < budget) && (tx_done)) { + napi_complete(napi); + octeon_process_droq_poll_cmd(droq->oct_dev, droq->q_no, + POLL_EVENT_ENABLE_INTR, 0); + return 0; + } + + return (!tx_done) ? (budget) : (work_done); +} + /** * \brief Setup input and output queues * @param octeon_dev octeon device @@ -1153,16 +1489,68 @@ static u16 select_q(struct net_device *dev, struct sk_buff *skb, */ static int setup_io_queues(struct octeon_device *octeon_dev, int ifidx) { + struct octeon_droq_ops droq_ops; struct net_device *netdev; + static int cpu_id_modulus; + struct octeon_droq *droq; + struct napi_struct *napi; + static int cpu_id; int num_tx_descs; struct lio *lio; int retval = 0; - int q; + int q, q_no; netdev = octeon_dev->props[ifidx].netdev; lio = GET_LIO(netdev); + memset(&droq_ops, 0, sizeof(struct octeon_droq_ops)); + + droq_ops.fptr = liquidio_push_packet; + droq_ops.farg = netdev; + + droq_ops.poll_mode = 1; + droq_ops.napi_fn = liquidio_vf_napi_drv_callback; + cpu_id = 0; + cpu_id_modulus = num_present_cpus(); + + /* set up DROQs. */ + for (q = 0; q < lio->linfo.num_rxpciq; q++) { + q_no = lio->linfo.rxpciq[q].s.q_no; + + retval = octeon_setup_droq( + octeon_dev, q_no, + CFG_GET_NUM_RX_DESCS_NIC_IF(octeon_get_conf(octeon_dev), + lio->ifidx), + CFG_GET_NUM_RX_BUF_SIZE_NIC_IF(octeon_get_conf(octeon_dev), + lio->ifidx), + NULL); + if (retval) { + dev_err(&octeon_dev->pci_dev->dev, + "%s : Runtime DROQ(RxQ) creation failed.\n", + __func__); + return 1; + } + + droq = octeon_dev->droq[q_no]; + napi = &droq->napi; + netif_napi_add(netdev, napi, liquidio_napi_poll, 64); + + /* designate a CPU for this droq */ + droq->cpu_id = cpu_id; + cpu_id++; + if (cpu_id >= cpu_id_modulus) + cpu_id = 0; + + octeon_register_droq_ops(octeon_dev, q_no, &droq_ops); + } + + /* 23XX VF can send/recv control messages (via the first VF-owned + * droq) from the firmware even if the ethX interface is down, + * so that's why poll_mode must be off for the first droq. + */ + octeon_dev->droq[0]->ops.poll_mode = 0; + /* set up IQs. */ for (q = 0; q < lio->linfo.num_txpciq; q++) { num_tx_descs = CFG_GET_NUM_TX_DESCS_NIC_IF( @@ -1189,6 +1577,16 @@ static int liquidio_open(struct net_device *netdev) { struct lio *lio = GET_LIO(netdev); struct octeon_device *oct = lio->oct_dev; + struct napi_struct *napi, *n; + + if (!oct->props[lio->ifidx].napi_enabled) { + list_for_each_entry_safe(napi, n, &netdev->napi_list, dev_list) + napi_enable(napi); + + oct->props[lio->ifidx].napi_enabled = 1; + + oct->droq[0]->ops.poll_mode = 1; + } ifstate_set(lio, LIO_IFSTATE_RUNNING); @@ -1198,6 +1596,9 @@ static int liquidio_open(struct net_device *netdev) netif_info(lio, ifup, lio->netdev, "Interface Open, ready for traffic\n"); start_txq(netdev); + /* tell Octeon to start forwarding packets to host */ + send_rx_ctrl_cmd(lio, 1); + dev_info(&oct->pci_dev->dev, "%s interface is opened\n", netdev->name); return 0; @@ -1220,6 +1621,9 @@ static int liquidio_stop(struct net_device *netdev) netif_carrier_off(netdev); lio->link_changes++; + /* tell Octeon to stop forwarding packets to host */ + send_rx_ctrl_cmd(lio, 0); + ifstate_reset(lio, LIO_IFSTATE_RUNNING); txqs_stop(netdev); @@ -2016,6 +2420,8 @@ static int setup_nic_devices(struct octeon_device *octeon_dev) goto setup_nic_dev_fail; } + ifstate_set(lio, LIO_IFSTATE_DROQ_OPS); + /* For VFs, enable Octeon device interrupts here, * as this is contingent upon IO queue setup */ @@ -2026,8 +2432,10 @@ static int setup_nic_devices(struct octeon_device *octeon_dev) * tx and rx queues */ lio->txq = lio->linfo.txpciq[0].s.q_no; + lio->rxq = lio->linfo.rxpciq[0].s.q_no; lio->tx_qsize = octeon_get_tx_qsize(octeon_dev, lio->txq); + lio->rx_qsize = octeon_get_rx_qsize(octeon_dev, lio->rxq); if (setup_glists(lio, num_iqueues)) { dev_err(&octeon_dev->pci_dev->dev, diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_device.c b/drivers/net/ethernet/cavium/liquidio/octeon_device.c index 583818e047d6..a8df493a5012 100644 --- a/drivers/net/ethernet/cavium/liquidio/octeon_device.c +++ b/drivers/net/ethernet/cavium/liquidio/octeon_device.c @@ -1374,7 +1374,7 @@ void lio_enable_irq(struct octeon_droq *droq, struct octeon_instr_queue *iq) /*write resend. Writing RESEND in SLI_PKTX_CNTS should be enough *to trigger tx interrupts as well, if they are pending. */ - if (oct && OCTEON_CN23XX_PF(oct)) { + if (oct && (OCTEON_CN23XX_PF(oct) || OCTEON_CN23XX_VF(oct))) { if (droq) writeq(CN23XX_INTR_RESEND, droq->pkts_sent_reg); /*we race with firmrware here. read and write the IN_DONE_CNTS*/ diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c index 8bf1ac76bcdc..0be87d119a97 100644 --- a/drivers/net/ethernet/cavium/liquidio/octeon_droq.c +++ b/drivers/net/ethernet/cavium/liquidio/octeon_droq.c @@ -28,6 +28,7 @@ #include "cn66xx_regs.h" #include "cn66xx_device.h" #include "cn23xx_pf_device.h" +#include "cn23xx_vf_device.h" struct niclist { struct list_head list; @@ -259,6 +260,11 @@ int octeon_init_droq(struct octeon_device *oct, } else if (OCTEON_CN23XX_PF(oct)) { struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_pf); + c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23); + c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23); + } else if (OCTEON_CN23XX_VF(oct)) { + struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_vf); + c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23); c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23); } else { @@ -889,6 +895,10 @@ octeon_process_droq_poll_cmd(struct octeon_device *oct, u32 q_no, int cmd, lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]); } break; + + case OCTEON_CN23XX_VF_VID: + lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]); + break; } return 0; } diff --git a/drivers/net/ethernet/cavium/liquidio/response_manager.c b/drivers/net/ethernet/cavium/liquidio/response_manager.c index fdaf742a59cb..2fbaae96b505 100644 --- a/drivers/net/ethernet/cavium/liquidio/response_manager.c +++ b/drivers/net/ethernet/cavium/liquidio/response_manager.c @@ -84,7 +84,8 @@ int lio_process_ordered_list(struct octeon_device *octeon_dev, sc = (struct octeon_soft_command *)ordered_sc_list-> head.next; - if (OCTEON_CN23XX_PF(octeon_dev)) { + if (OCTEON_CN23XX_PF(octeon_dev) || + OCTEON_CN23XX_VF(octeon_dev)) { rdp = (struct octeon_instr_rdp *)&sc->cmd.cmd3.rdp; rptr = sc->cmd.cmd3.rptr; } else { -- 2.30.2