// SPDX-License-Identifier: GPL-2.0 /* Marvell Octeon EP (EndPoint) Ethernet Driver * * Copyright (C) 2020 Marvell. * */ #include #include #include #include #include #include #include #include #include "octep_config.h" #include "octep_main.h" #include "octep_ctrl_net.h" struct workqueue_struct *octep_wq; /* Supported Devices */ static const struct pci_device_id octep_pci_id_tbl[] = { {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CN93_PF)}, {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CNF95N_PF)}, {0, }, }; MODULE_DEVICE_TABLE(pci, octep_pci_id_tbl); MODULE_AUTHOR("Veerasenareddy Burru "); MODULE_DESCRIPTION(OCTEP_DRV_STRING); MODULE_LICENSE("GPL"); /** * octep_alloc_ioq_vectors() - Allocate Tx/Rx Queue interrupt info. * * @oct: Octeon device private data structure. * * Allocate resources to hold per Tx/Rx queue interrupt info. * This is the information passed to interrupt handler, from which napi poll * is scheduled and includes quick access to private data of Tx/Rx queue * corresponding to the interrupt being handled. * * Return: 0, on successful allocation of resources for all queue interrupts. * -1, if failed to allocate any resource. */ static int octep_alloc_ioq_vectors(struct octep_device *oct) { int i; struct octep_ioq_vector *ioq_vector; for (i = 0; i < oct->num_oqs; i++) { oct->ioq_vector[i] = vzalloc(sizeof(*oct->ioq_vector[i])); if (!oct->ioq_vector[i]) goto free_ioq_vector; ioq_vector = oct->ioq_vector[i]; ioq_vector->iq = oct->iq[i]; ioq_vector->oq = oct->oq[i]; ioq_vector->octep_dev = oct; } dev_info(&oct->pdev->dev, "Allocated %d IOQ vectors\n", oct->num_oqs); return 0; free_ioq_vector: while (i) { i--; vfree(oct->ioq_vector[i]); oct->ioq_vector[i] = NULL; } return -1; } /** * octep_free_ioq_vectors() - Free Tx/Rx Queue interrupt vector info. * * @oct: Octeon device private data structure. */ static void octep_free_ioq_vectors(struct octep_device *oct) { int i; for (i = 0; i < oct->num_oqs; i++) { if (oct->ioq_vector[i]) { vfree(oct->ioq_vector[i]); oct->ioq_vector[i] = NULL; } } netdev_info(oct->netdev, "Freed IOQ Vectors\n"); } /** * octep_enable_msix_range() - enable MSI-x interrupts. * * @oct: Octeon device private data structure. * * Allocate and enable all MSI-x interrupts (queue and non-queue interrupts) * for the Octeon device. * * Return: 0, on successfully enabling all MSI-x interrupts. * -1, if failed to enable any MSI-x interrupt. */ static int octep_enable_msix_range(struct octep_device *oct) { int num_msix, msix_allocated; int i; /* Generic interrupts apart from input/output queues */ num_msix = oct->num_oqs + CFG_GET_NON_IOQ_MSIX(oct->conf); oct->msix_entries = kcalloc(num_msix, sizeof(struct msix_entry), GFP_KERNEL); if (!oct->msix_entries) goto msix_alloc_err; for (i = 0; i < num_msix; i++) oct->msix_entries[i].entry = i; msix_allocated = pci_enable_msix_range(oct->pdev, oct->msix_entries, num_msix, num_msix); if (msix_allocated != num_msix) { dev_err(&oct->pdev->dev, "Failed to enable %d msix irqs; got only %d\n", num_msix, msix_allocated); goto enable_msix_err; } oct->num_irqs = msix_allocated; dev_info(&oct->pdev->dev, "MSI-X enabled successfully\n"); return 0; enable_msix_err: if (msix_allocated > 0) pci_disable_msix(oct->pdev); kfree(oct->msix_entries); oct->msix_entries = NULL; msix_alloc_err: return -1; } /** * octep_disable_msix() - disable MSI-x interrupts. * * @oct: Octeon device private data structure. * * Disable MSI-x on the Octeon device. */ static void octep_disable_msix(struct octep_device *oct) { pci_disable_msix(oct->pdev); kfree(oct->msix_entries); oct->msix_entries = NULL; dev_info(&oct->pdev->dev, "Disabled MSI-X\n"); } /** * octep_non_ioq_intr_handler() - common handler for all generic interrupts. * * @irq: Interrupt number. * @data: interrupt data. * * this is common handler for all non-queue (generic) interrupts. */ static irqreturn_t octep_non_ioq_intr_handler(int irq, void *data) { struct octep_device *oct = data; return oct->hw_ops.non_ioq_intr_handler(oct); } /** * octep_ioq_intr_handler() - handler for all Tx/Rx queue interrupts. * * @irq: Interrupt number. * @data: interrupt data contains pointers to Tx/Rx queue private data * and correspong NAPI context. * * this is common handler for all non-queue (generic) interrupts. */ static irqreturn_t octep_ioq_intr_handler(int irq, void *data) { struct octep_ioq_vector *ioq_vector = data; struct octep_device *oct = ioq_vector->octep_dev; return oct->hw_ops.ioq_intr_handler(ioq_vector); } /** * octep_request_irqs() - Register interrupt handlers. * * @oct: Octeon device private data structure. * * Register handlers for all queue and non-queue interrupts. * * Return: 0, on successful registration of all interrupt handlers. * -1, on any error. */ static int octep_request_irqs(struct octep_device *oct) { struct net_device *netdev = oct->netdev; struct octep_ioq_vector *ioq_vector; struct msix_entry *msix_entry; char **non_ioq_msix_names; int num_non_ioq_msix; int ret, i, j; num_non_ioq_msix = CFG_GET_NON_IOQ_MSIX(oct->conf); non_ioq_msix_names = CFG_GET_NON_IOQ_MSIX_NAMES(oct->conf); oct->non_ioq_irq_names = kcalloc(num_non_ioq_msix, OCTEP_MSIX_NAME_SIZE, GFP_KERNEL); if (!oct->non_ioq_irq_names) goto alloc_err; /* First few MSI-X interrupts are non-queue interrupts */ for (i = 0; i < num_non_ioq_msix; i++) { char *irq_name; irq_name = &oct->non_ioq_irq_names[i * OCTEP_MSIX_NAME_SIZE]; msix_entry = &oct->msix_entries[i]; snprintf(irq_name, OCTEP_MSIX_NAME_SIZE, "%s-%s", netdev->name, non_ioq_msix_names[i]); ret = request_irq(msix_entry->vector, octep_non_ioq_intr_handler, 0, irq_name, oct); if (ret) { netdev_err(netdev, "request_irq failed for %s; err=%d", irq_name, ret); goto non_ioq_irq_err; } } /* Request IRQs for Tx/Rx queues */ for (j = 0; j < oct->num_oqs; j++) { ioq_vector = oct->ioq_vector[j]; msix_entry = &oct->msix_entries[j + num_non_ioq_msix]; snprintf(ioq_vector->name, sizeof(ioq_vector->name), "%s-q%d", netdev->name, j); ret = request_irq(msix_entry->vector, octep_ioq_intr_handler, 0, ioq_vector->name, ioq_vector); if (ret) { netdev_err(netdev, "request_irq failed for Q-%d; err=%d", j, ret); goto ioq_irq_err; } cpumask_set_cpu(j % num_online_cpus(), &ioq_vector->affinity_mask); irq_set_affinity_hint(msix_entry->vector, &ioq_vector->affinity_mask); } return 0; ioq_irq_err: while (j) { --j; ioq_vector = oct->ioq_vector[j]; msix_entry = &oct->msix_entries[j + num_non_ioq_msix]; irq_set_affinity_hint(msix_entry->vector, NULL); free_irq(msix_entry->vector, ioq_vector); } non_ioq_irq_err: while (i) { --i; free_irq(oct->msix_entries[i].vector, oct); } kfree(oct->non_ioq_irq_names); oct->non_ioq_irq_names = NULL; alloc_err: return -1; } /** * octep_free_irqs() - free all registered interrupts. * * @oct: Octeon device private data structure. * * Free all queue and non-queue interrupts of the Octeon device. */ static void octep_free_irqs(struct octep_device *oct) { int i; /* First few MSI-X interrupts are non queue interrupts; free them */ for (i = 0; i < CFG_GET_NON_IOQ_MSIX(oct->conf); i++) free_irq(oct->msix_entries[i].vector, oct); kfree(oct->non_ioq_irq_names); /* Free IRQs for Input/Output (Tx/Rx) queues */ for (i = CFG_GET_NON_IOQ_MSIX(oct->conf); i < oct->num_irqs; i++) { irq_set_affinity_hint(oct->msix_entries[i].vector, NULL); free_irq(oct->msix_entries[i].vector, oct->ioq_vector[i - CFG_GET_NON_IOQ_MSIX(oct->conf)]); } netdev_info(oct->netdev, "IRQs freed\n"); } /** * octep_setup_irqs() - setup interrupts for the Octeon device. * * @oct: Octeon device private data structure. * * Allocate data structures to hold per interrupt information, allocate/enable * MSI-x interrupt and register interrupt handlers. * * Return: 0, on successful allocation and registration of all interrupts. * -1, on any error. */ static int octep_setup_irqs(struct octep_device *oct) { if (octep_alloc_ioq_vectors(oct)) goto ioq_vector_err; if (octep_enable_msix_range(oct)) goto enable_msix_err; if (octep_request_irqs(oct)) goto request_irq_err; return 0; request_irq_err: octep_disable_msix(oct); enable_msix_err: octep_free_ioq_vectors(oct); ioq_vector_err: return -1; } /** * octep_clean_irqs() - free all interrupts and its resources. * * @oct: Octeon device private data structure. */ static void octep_clean_irqs(struct octep_device *oct) { octep_free_irqs(oct); octep_disable_msix(oct); octep_free_ioq_vectors(oct); } /** * octep_enable_ioq_irq() - Enable MSI-x interrupt of a Tx/Rx queue. * * @iq: Octeon Tx queue data structure. * @oq: Octeon Rx queue data structure. */ static void octep_enable_ioq_irq(struct octep_iq *iq, struct octep_oq *oq) { u32 pkts_pend = oq->pkts_pending; netdev_dbg(iq->netdev, "enabling intr for Q-%u\n", iq->q_no); if (iq->pkts_processed) { writel(iq->pkts_processed, iq->inst_cnt_reg); iq->pkt_in_done -= iq->pkts_processed; iq->pkts_processed = 0; } if (oq->last_pkt_count - pkts_pend) { writel(oq->last_pkt_count - pkts_pend, oq->pkts_sent_reg); oq->last_pkt_count = pkts_pend; } /* Flush the previous wrties before writing to RESEND bit */ wmb(); writeq(1UL << OCTEP_OQ_INTR_RESEND_BIT, oq->pkts_sent_reg); writeq(1UL << OCTEP_IQ_INTR_RESEND_BIT, iq->inst_cnt_reg); } /** * octep_napi_poll() - NAPI poll function for Tx/Rx. * * @napi: pointer to napi context. * @budget: max number of packets to be processed in single invocation. */ static int octep_napi_poll(struct napi_struct *napi, int budget) { struct octep_ioq_vector *ioq_vector = container_of(napi, struct octep_ioq_vector, napi); u32 tx_pending, rx_done; tx_pending = octep_iq_process_completions(ioq_vector->iq, budget); rx_done = octep_oq_process_rx(ioq_vector->oq, budget); /* need more polling if tx completion processing is still pending or * processed at least 'budget' number of rx packets. */ if (tx_pending || rx_done >= budget) return budget; napi_complete(napi); octep_enable_ioq_irq(ioq_vector->iq, ioq_vector->oq); return rx_done; } /** * octep_napi_add() - Add NAPI poll for all Tx/Rx queues. * * @oct: Octeon device private data structure. */ static void octep_napi_add(struct octep_device *oct) { int i; for (i = 0; i < oct->num_oqs; i++) { netdev_dbg(oct->netdev, "Adding NAPI on Q-%d\n", i); netif_napi_add(oct->netdev, &oct->ioq_vector[i]->napi, octep_napi_poll); oct->oq[i]->napi = &oct->ioq_vector[i]->napi; } } /** * octep_napi_delete() - delete NAPI poll callback for all Tx/Rx queues. * * @oct: Octeon device private data structure. */ static void octep_napi_delete(struct octep_device *oct) { int i; for (i = 0; i < oct->num_oqs; i++) { netdev_dbg(oct->netdev, "Deleting NAPI on Q-%d\n", i); netif_napi_del(&oct->ioq_vector[i]->napi); oct->oq[i]->napi = NULL; } } /** * octep_napi_enable() - enable NAPI for all Tx/Rx queues. * * @oct: Octeon device private data structure. */ static void octep_napi_enable(struct octep_device *oct) { int i; for (i = 0; i < oct->num_oqs; i++) { netdev_dbg(oct->netdev, "Enabling NAPI on Q-%d\n", i); napi_enable(&oct->ioq_vector[i]->napi); } } /** * octep_napi_disable() - disable NAPI for all Tx/Rx queues. * * @oct: Octeon device private data structure. */ static void octep_napi_disable(struct octep_device *oct) { int i; for (i = 0; i < oct->num_oqs; i++) { netdev_dbg(oct->netdev, "Disabling NAPI on Q-%d\n", i); napi_disable(&oct->ioq_vector[i]->napi); } } static void octep_link_up(struct net_device *netdev) { netif_carrier_on(netdev); netif_tx_start_all_queues(netdev); } /** * octep_open() - start the octeon network device. * * @netdev: pointer to kernel network device. * * setup Tx/Rx queues, interrupts and enable hardware operation of Tx/Rx queues * and interrupts.. * * Return: 0, on successfully setting up device and bring it up. * -1, on any error. */ static int octep_open(struct net_device *netdev) { struct octep_device *oct = netdev_priv(netdev); int err, ret; netdev_info(netdev, "Starting netdev ...\n"); netif_carrier_off(netdev); oct->hw_ops.reset_io_queues(oct); if (octep_setup_iqs(oct)) goto setup_iq_err; if (octep_setup_oqs(oct)) goto setup_oq_err; if (octep_setup_irqs(oct)) goto setup_irq_err; err = netif_set_real_num_tx_queues(netdev, oct->num_oqs); if (err) goto set_queues_err; err = netif_set_real_num_rx_queues(netdev, oct->num_iqs); if (err) goto set_queues_err; octep_napi_add(oct); octep_napi_enable(oct); oct->link_info.admin_up = 1; octep_set_rx_state(oct, true); ret = octep_get_link_status(oct); if (!ret) octep_set_link_status(oct, true); /* Enable the input and output queues for this Octeon device */ oct->hw_ops.enable_io_queues(oct); /* Enable Octeon device interrupts */ oct->hw_ops.enable_interrupts(oct); octep_oq_dbell_init(oct); ret = octep_get_link_status(oct); if (ret > 0) octep_link_up(netdev); return 0; set_queues_err: octep_clean_irqs(oct); setup_irq_err: octep_free_oqs(oct); setup_oq_err: octep_free_iqs(oct); setup_iq_err: return -1; } /** * octep_stop() - stop the octeon network device. * * @netdev: pointer to kernel network device. * * stop the device Tx/Rx operations, bring down the link and * free up all resources allocated for Tx/Rx queues and interrupts. */ static int octep_stop(struct net_device *netdev) { struct octep_device *oct = netdev_priv(netdev); netdev_info(netdev, "Stopping the device ...\n"); /* Stop Tx from stack */ netif_tx_stop_all_queues(netdev); netif_carrier_off(netdev); netif_tx_disable(netdev); octep_set_link_status(oct, false); octep_set_rx_state(oct, false); oct->link_info.admin_up = 0; oct->link_info.oper_up = 0; oct->hw_ops.disable_interrupts(oct); octep_napi_disable(oct); octep_napi_delete(oct); octep_clean_irqs(oct); octep_clean_iqs(oct); oct->hw_ops.disable_io_queues(oct); oct->hw_ops.reset_io_queues(oct); octep_free_oqs(oct); octep_free_iqs(oct); netdev_info(netdev, "Device stopped !!\n"); return 0; } /** * octep_iq_full_check() - check if a Tx queue is full. * * @iq: Octeon Tx queue data structure. * * Return: 0, if the Tx queue is not full. * 1, if the Tx queue is full. */ static inline int octep_iq_full_check(struct octep_iq *iq) { if (likely((iq->max_count - atomic_read(&iq->instr_pending)) >= OCTEP_WAKE_QUEUE_THRESHOLD)) return 0; /* Stop the queue if unable to send */ netif_stop_subqueue(iq->netdev, iq->q_no); /* check again and restart the queue, in case NAPI has just freed * enough Tx ring entries. */ if (unlikely((iq->max_count - atomic_read(&iq->instr_pending)) >= OCTEP_WAKE_QUEUE_THRESHOLD)) { netif_start_subqueue(iq->netdev, iq->q_no); iq->stats.restart_cnt++; return 0; } return 1; } /** * octep_start_xmit() - Enqueue packet to Octoen hardware Tx Queue. * * @skb: packet skbuff pointer. * @netdev: kernel network device. * * Return: NETDEV_TX_BUSY, if Tx Queue is full. * NETDEV_TX_OK, if successfully enqueued to hardware Tx queue. */ static netdev_tx_t octep_start_xmit(struct sk_buff *skb, struct net_device *netdev) { struct octep_device *oct = netdev_priv(netdev); struct octep_tx_sglist_desc *sglist; struct octep_tx_buffer *tx_buffer; struct octep_tx_desc_hw *hw_desc; struct skb_shared_info *shinfo; struct octep_instr_hdr *ih; struct octep_iq *iq; skb_frag_t *frag; u16 nr_frags, si; u16 q_no, wi; q_no = skb_get_queue_mapping(skb); if (q_no >= oct->num_iqs) { netdev_err(netdev, "Invalid Tx skb->queue_mapping=%d\n", q_no); q_no = q_no % oct->num_iqs; } iq = oct->iq[q_no]; if (octep_iq_full_check(iq)) { iq->stats.tx_busy++; return NETDEV_TX_BUSY; } shinfo = skb_shinfo(skb); nr_frags = shinfo->nr_frags; wi = iq->host_write_index; hw_desc = &iq->desc_ring[wi]; hw_desc->ih64 = 0; tx_buffer = iq->buff_info + wi; tx_buffer->skb = skb; ih = &hw_desc->ih; ih->tlen = skb->len; ih->pkind = oct->pkind; if (!nr_frags) { tx_buffer->gather = 0; tx_buffer->dma = dma_map_single(iq->dev, skb->data, skb->len, DMA_TO_DEVICE); if (dma_mapping_error(iq->dev, tx_buffer->dma)) goto dma_map_err; hw_desc->dptr = tx_buffer->dma; } else { /* Scatter/Gather */ dma_addr_t dma; u16 len; sglist = tx_buffer->sglist; ih->gsz = nr_frags + 1; ih->gather = 1; tx_buffer->gather = 1; len = skb_headlen(skb); dma = dma_map_single(iq->dev, skb->data, len, DMA_TO_DEVICE); if (dma_mapping_error(iq->dev, dma)) goto dma_map_err; dma_sync_single_for_cpu(iq->dev, tx_buffer->sglist_dma, OCTEP_SGLIST_SIZE_PER_PKT, DMA_TO_DEVICE); memset(sglist, 0, OCTEP_SGLIST_SIZE_PER_PKT); sglist[0].len[3] = len; sglist[0].dma_ptr[0] = dma; si = 1; /* entry 0 is main skb, mapped above */ frag = &shinfo->frags[0]; while (nr_frags--) { len = skb_frag_size(frag); dma = skb_frag_dma_map(iq->dev, frag, 0, len, DMA_TO_DEVICE); if (dma_mapping_error(iq->dev, dma)) goto dma_map_sg_err; sglist[si >> 2].len[3 - (si & 3)] = len; sglist[si >> 2].dma_ptr[si & 3] = dma; frag++; si++; } dma_sync_single_for_device(iq->dev, tx_buffer->sglist_dma, OCTEP_SGLIST_SIZE_PER_PKT, DMA_TO_DEVICE); hw_desc->dptr = tx_buffer->sglist_dma; } /* Flush the hw descriptor before writing to doorbell */ wmb(); /* Ring Doorbell to notify the NIC there is a new packet */ writel(1, iq->doorbell_reg); atomic_inc(&iq->instr_pending); wi++; if (wi == iq->max_count) wi = 0; iq->host_write_index = wi; netdev_tx_sent_queue(iq->netdev_q, skb->len); iq->stats.instr_posted++; skb_tx_timestamp(skb); return NETDEV_TX_OK; dma_map_sg_err: if (si > 0) { dma_unmap_single(iq->dev, sglist[0].dma_ptr[0], sglist[0].len[0], DMA_TO_DEVICE); sglist[0].len[0] = 0; } while (si > 1) { dma_unmap_page(iq->dev, sglist[si >> 2].dma_ptr[si & 3], sglist[si >> 2].len[si & 3], DMA_TO_DEVICE); sglist[si >> 2].len[si & 3] = 0; si--; } tx_buffer->gather = 0; dma_map_err: dev_kfree_skb_any(skb); return NETDEV_TX_OK; } /** * octep_get_stats64() - Get Octeon network device statistics. * * @netdev: kernel network device. * @stats: pointer to stats structure to be filled in. */ static void octep_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats) { u64 tx_packets, tx_bytes, rx_packets, rx_bytes; struct octep_device *oct = netdev_priv(netdev); int q; octep_get_if_stats(oct); tx_packets = 0; tx_bytes = 0; rx_packets = 0; rx_bytes = 0; for (q = 0; q < oct->num_oqs; q++) { struct octep_iq *iq = oct->iq[q]; struct octep_oq *oq = oct->oq[q]; tx_packets += iq->stats.instr_completed; tx_bytes += iq->stats.bytes_sent; rx_packets += oq->stats.packets; rx_bytes += oq->stats.bytes; } stats->tx_packets = tx_packets; stats->tx_bytes = tx_bytes; stats->rx_packets = rx_packets; stats->rx_bytes = rx_bytes; stats->multicast = oct->iface_rx_stats.mcast_pkts; stats->rx_errors = oct->iface_rx_stats.err_pkts; stats->collisions = oct->iface_tx_stats.xscol; stats->tx_fifo_errors = oct->iface_tx_stats.undflw; } /** * octep_tx_timeout_task - work queue task to Handle Tx queue timeout. * * @work: pointer to Tx queue timeout work_struct * * Stop and start the device so that it frees up all queue resources * and restarts the queues, that potentially clears a Tx queue timeout * condition. **/ static void octep_tx_timeout_task(struct work_struct *work) { struct octep_device *oct = container_of(work, struct octep_device, tx_timeout_task); struct net_device *netdev = oct->netdev; rtnl_lock(); if (netif_running(netdev)) { octep_stop(netdev); octep_open(netdev); } rtnl_unlock(); } /** * octep_tx_timeout() - Handle Tx Queue timeout. * * @netdev: pointer to kernel network device. * @txqueue: Timed out Tx queue number. * * Schedule a work to handle Tx queue timeout. */ static void octep_tx_timeout(struct net_device *netdev, unsigned int txqueue) { struct octep_device *oct = netdev_priv(netdev); queue_work(octep_wq, &oct->tx_timeout_task); } static int octep_set_mac(struct net_device *netdev, void *p) { struct octep_device *oct = netdev_priv(netdev); struct sockaddr *addr = (struct sockaddr *)p; int err; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; err = octep_set_mac_addr(oct, addr->sa_data); if (err) return err; memcpy(oct->mac_addr, addr->sa_data, ETH_ALEN); eth_hw_addr_set(netdev, addr->sa_data); return 0; } static int octep_change_mtu(struct net_device *netdev, int new_mtu) { struct octep_device *oct = netdev_priv(netdev); struct octep_iface_link_info *link_info; int err = 0; link_info = &oct->link_info; if (link_info->mtu == new_mtu) return 0; err = octep_set_mtu(oct, new_mtu); if (!err) { oct->link_info.mtu = new_mtu; netdev->mtu = new_mtu; } return err; } static const struct net_device_ops octep_netdev_ops = { .ndo_open = octep_open, .ndo_stop = octep_stop, .ndo_start_xmit = octep_start_xmit, .ndo_get_stats64 = octep_get_stats64, .ndo_tx_timeout = octep_tx_timeout, .ndo_set_mac_address = octep_set_mac, .ndo_change_mtu = octep_change_mtu, }; /** * octep_ctrl_mbox_task - work queue task to handle ctrl mbox messages. * * @work: pointer to ctrl mbox work_struct * * Poll ctrl mbox message queue and handle control messages from firmware. **/ static void octep_ctrl_mbox_task(struct work_struct *work) { struct octep_device *oct = container_of(work, struct octep_device, ctrl_mbox_task); struct net_device *netdev = oct->netdev; struct octep_ctrl_net_f2h_req req = {}; struct octep_ctrl_mbox_msg msg; int ret = 0; msg.msg = &req; while (true) { ret = octep_ctrl_mbox_recv(&oct->ctrl_mbox, &msg); if (ret) break; switch (req.hdr.cmd) { case OCTEP_CTRL_NET_F2H_CMD_LINK_STATUS: if (netif_running(netdev)) { if (req.link.state) { dev_info(&oct->pdev->dev, "netif_carrier_on\n"); netif_carrier_on(netdev); } else { dev_info(&oct->pdev->dev, "netif_carrier_off\n"); netif_carrier_off(netdev); } } break; default: pr_info("Unknown mbox req : %u\n", req.hdr.cmd); break; } } } static const char *octep_devid_to_str(struct octep_device *oct) { switch (oct->chip_id) { case OCTEP_PCI_DEVICE_ID_CN93_PF: return "CN93XX"; case OCTEP_PCI_DEVICE_ID_CNF95N_PF: return "CNF95N"; default: return "Unsupported"; } } /** * octep_device_setup() - Setup Octeon Device. * * @oct: Octeon device private data structure. * * Setup Octeon device hardware operations, configuration, etc ... */ int octep_device_setup(struct octep_device *oct) { struct octep_ctrl_mbox *ctrl_mbox; struct pci_dev *pdev = oct->pdev; int i, ret; /* allocate memory for oct->conf */ oct->conf = kzalloc(sizeof(*oct->conf), GFP_KERNEL); if (!oct->conf) return -ENOMEM; /* Map BAR regions */ for (i = 0; i < OCTEP_MMIO_REGIONS; i++) { oct->mmio[i].hw_addr = ioremap(pci_resource_start(oct->pdev, i * 2), pci_resource_len(oct->pdev, i * 2)); if (!oct->mmio[i].hw_addr) goto unmap_prev; oct->mmio[i].mapped = 1; } oct->chip_id = pdev->device; oct->rev_id = pdev->revision; dev_info(&pdev->dev, "chip_id = 0x%x\n", pdev->device); switch (oct->chip_id) { case OCTEP_PCI_DEVICE_ID_CN93_PF: case OCTEP_PCI_DEVICE_ID_CNF95N_PF: dev_info(&pdev->dev, "Setting up OCTEON %s PF PASS%d.%d\n", octep_devid_to_str(oct), OCTEP_MAJOR_REV(oct), OCTEP_MINOR_REV(oct)); octep_device_setup_cn93_pf(oct); break; default: dev_err(&pdev->dev, "%s: unsupported device\n", __func__); goto unsupported_dev; } oct->pkind = CFG_GET_IQ_PKIND(oct->conf); /* Initialize control mbox */ ctrl_mbox = &oct->ctrl_mbox; ctrl_mbox->barmem = CFG_GET_CTRL_MBOX_MEM_ADDR(oct->conf); ret = octep_ctrl_mbox_init(ctrl_mbox); if (ret) { dev_err(&pdev->dev, "Failed to initialize control mbox\n"); goto unsupported_dev; } oct->ctrl_mbox_ifstats_offset = OCTEP_CTRL_MBOX_SZ(ctrl_mbox->h2fq.elem_sz, ctrl_mbox->h2fq.elem_cnt, ctrl_mbox->f2hq.elem_sz, ctrl_mbox->f2hq.elem_cnt); return 0; unsupported_dev: i = OCTEP_MMIO_REGIONS; unmap_prev: while (i--) iounmap(oct->mmio[i].hw_addr); kfree(oct->conf); return -1; } /** * octep_device_cleanup() - Cleanup Octeon Device. * * @oct: Octeon device private data structure. * * Cleanup Octeon device allocated resources. */ static void octep_device_cleanup(struct octep_device *oct) { int i; dev_info(&oct->pdev->dev, "Cleaning up Octeon Device ...\n"); for (i = 0; i < OCTEP_MAX_VF; i++) { vfree(oct->mbox[i]); oct->mbox[i] = NULL; } octep_ctrl_mbox_uninit(&oct->ctrl_mbox); oct->hw_ops.soft_reset(oct); for (i = 0; i < OCTEP_MMIO_REGIONS; i++) { if (oct->mmio[i].mapped) iounmap(oct->mmio[i].hw_addr); } kfree(oct->conf); oct->conf = NULL; } /** * octep_probe() - Octeon PCI device probe handler. * * @pdev: PCI device structure. * @ent: entry in Octeon PCI device ID table. * * Initializes and enables the Octeon PCI device for network operations. * Initializes Octeon private data structure and registers a network device. */ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct octep_device *octep_dev = NULL; struct net_device *netdev; int err; err = pci_enable_device(pdev); if (err) { dev_err(&pdev->dev, "Failed to enable PCI device\n"); return err; } err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); if (err) { dev_err(&pdev->dev, "Failed to set DMA mask !!\n"); goto err_dma_mask; } err = pci_request_mem_regions(pdev, OCTEP_DRV_NAME); if (err) { dev_err(&pdev->dev, "Failed to map PCI memory regions\n"); goto err_pci_regions; } pci_enable_pcie_error_reporting(pdev); pci_set_master(pdev); netdev = alloc_etherdev_mq(sizeof(struct octep_device), OCTEP_MAX_QUEUES); if (!netdev) { dev_err(&pdev->dev, "Failed to allocate netdev\n"); err = -ENOMEM; goto err_alloc_netdev; } SET_NETDEV_DEV(netdev, &pdev->dev); octep_dev = netdev_priv(netdev); octep_dev->netdev = netdev; octep_dev->pdev = pdev; octep_dev->dev = &pdev->dev; pci_set_drvdata(pdev, octep_dev); err = octep_device_setup(octep_dev); if (err) { dev_err(&pdev->dev, "Device setup failed\n"); goto err_octep_config; } INIT_WORK(&octep_dev->tx_timeout_task, octep_tx_timeout_task); INIT_WORK(&octep_dev->ctrl_mbox_task, octep_ctrl_mbox_task); netdev->netdev_ops = &octep_netdev_ops; octep_set_ethtool_ops(netdev); netif_carrier_off(netdev); netdev->hw_features = NETIF_F_SG; netdev->features |= netdev->hw_features; netdev->min_mtu = OCTEP_MIN_MTU; netdev->max_mtu = OCTEP_MAX_MTU; netdev->mtu = OCTEP_DEFAULT_MTU; err = octep_get_mac_addr(octep_dev, octep_dev->mac_addr); if (err) { dev_err(&pdev->dev, "Failed to get mac address\n"); goto register_dev_err; } eth_hw_addr_set(netdev, octep_dev->mac_addr); err = register_netdev(netdev); if (err) { dev_err(&pdev->dev, "Failed to register netdev\n"); goto register_dev_err; } dev_info(&pdev->dev, "Device probe successful\n"); return 0; register_dev_err: octep_device_cleanup(octep_dev); err_octep_config: free_netdev(netdev); err_alloc_netdev: pci_disable_pcie_error_reporting(pdev); pci_release_mem_regions(pdev); err_pci_regions: err_dma_mask: pci_disable_device(pdev); return err; } /** * octep_remove() - Remove Octeon PCI device from driver control. * * @pdev: PCI device structure of the Octeon device. * * Cleanup all resources allocated for the Octeon device. * Unregister from network device and disable the PCI device. */ static void octep_remove(struct pci_dev *pdev) { struct octep_device *oct = pci_get_drvdata(pdev); struct net_device *netdev; if (!oct) return; cancel_work_sync(&oct->tx_timeout_task); cancel_work_sync(&oct->ctrl_mbox_task); netdev = oct->netdev; if (netdev->reg_state == NETREG_REGISTERED) unregister_netdev(netdev); octep_device_cleanup(oct); pci_release_mem_regions(pdev); free_netdev(netdev); pci_disable_pcie_error_reporting(pdev); pci_disable_device(pdev); } static struct pci_driver octep_driver = { .name = OCTEP_DRV_NAME, .id_table = octep_pci_id_tbl, .probe = octep_probe, .remove = octep_remove, }; /** * octep_init_module() - Module initialiation. * * create common resource for the driver and register PCI driver. */ static int __init octep_init_module(void) { int ret; pr_info("%s: Loading %s ...\n", OCTEP_DRV_NAME, OCTEP_DRV_STRING); /* work queue for all deferred tasks */ octep_wq = create_singlethread_workqueue(OCTEP_DRV_NAME); if (!octep_wq) { pr_err("%s: Failed to create common workqueue\n", OCTEP_DRV_NAME); return -ENOMEM; } ret = pci_register_driver(&octep_driver); if (ret < 0) { pr_err("%s: Failed to register PCI driver; err=%d\n", OCTEP_DRV_NAME, ret); destroy_workqueue(octep_wq); return ret; } pr_info("%s: Loaded successfully !\n", OCTEP_DRV_NAME); return ret; } /** * octep_exit_module() - Module exit routine. * * unregister the driver with PCI subsystem and cleanup common resources. */ static void __exit octep_exit_module(void) { pr_info("%s: Unloading ...\n", OCTEP_DRV_NAME); pci_unregister_driver(&octep_driver); destroy_workqueue(octep_wq); pr_info("%s: Unloading complete\n", OCTEP_DRV_NAME); } module_init(octep_init_module); module_exit(octep_exit_module);