diff options
Diffstat (limited to 'drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c')
| -rw-r--r-- | drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c | 1231 |
1 files changed, 1231 insertions, 0 deletions
diff --git a/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c new file mode 100644 index 000000000000..dd49d0b8b494 --- /dev/null +++ b/drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c @@ -0,0 +1,1231 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Marvell Octeon EP (EndPoint) VF Ethernet Driver + * + * Copyright (C) 2020 Marvell. + * + */ + +#include <linux/types.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/aer.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/rtnetlink.h> +#include <linux/vmalloc.h> +#include <net/netdev_queues.h> + +#include "octep_vf_config.h" +#include "octep_vf_main.h" + +struct workqueue_struct *octep_vf_wq; + +/* Supported Devices */ +static const struct pci_device_id octep_vf_pci_id_tbl[] = { + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CN93_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CNF95N_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CN98_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CN10KA_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CNF10KA_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CNF10KB_VF)}, + {PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_PCI_DEVICE_ID_CN10KB_VF)}, + {0, }, +}; +MODULE_DEVICE_TABLE(pci, octep_vf_pci_id_tbl); + +MODULE_AUTHOR("Veerasenareddy Burru <vburru@marvell.com>"); +MODULE_DESCRIPTION(OCTEP_VF_DRV_STRING); +MODULE_LICENSE("GPL"); + +/** + * octep_vf_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_vf_alloc_ioq_vectors(struct octep_vf_device *oct) +{ + struct octep_vf_ioq_vector *ioq_vector; + int i; + + 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_vf_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_vf_free_ioq_vectors() - Free Tx/Rx Queue interrupt vector info. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_free_ioq_vectors(struct octep_vf_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_vf_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_vf_enable_msix_range(struct octep_vf_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); + num_msix = oct->num_oqs; + 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_vf_disable_msix() - disable MSI-x interrupts. + * + * @oct: Octeon device private data structure. + * + * Disable MSI-x on the Octeon device. + */ +static void octep_vf_disable_msix(struct octep_vf_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_vf_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_vf_ioq_intr_handler(int irq, void *data) +{ + struct octep_vf_ioq_vector *ioq_vector = data; + struct octep_vf_device *oct = ioq_vector->octep_vf_dev; + + return oct->hw_ops.ioq_intr_handler(ioq_vector); +} + +/** + * octep_vf_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_vf_request_irqs(struct octep_vf_device *oct) +{ + struct net_device *netdev = oct->netdev; + struct octep_vf_ioq_vector *ioq_vector; + struct msix_entry *msix_entry; + int ret, i; + + /* Request IRQs for Tx/Rx queues */ + for (i = 0; i < oct->num_oqs; i++) { + ioq_vector = oct->ioq_vector[i]; + msix_entry = &oct->msix_entries[i]; + + snprintf(ioq_vector->name, sizeof(ioq_vector->name), + "%s-q%d", netdev->name, i); + ret = request_irq(msix_entry->vector, + octep_vf_ioq_intr_handler, 0, + ioq_vector->name, ioq_vector); + if (ret) { + netdev_err(netdev, + "request_irq failed for Q-%d; err=%d", + i, ret); + goto ioq_irq_err; + } + + cpumask_set_cpu(i % num_online_cpus(), + &ioq_vector->affinity_mask); + irq_set_affinity_hint(msix_entry->vector, + &ioq_vector->affinity_mask); + } + + return 0; +ioq_irq_err: + while (i) { + --i; + free_irq(oct->msix_entries[i].vector, oct); + } + return -1; +} + +/** + * octep_vf_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_vf_free_irqs(struct octep_vf_device *oct) +{ + int i; + + for (i = 0; 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]); + } + netdev_info(oct->netdev, "IRQs freed\n"); +} + +/** + * octep_vf_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_vf_setup_irqs(struct octep_vf_device *oct) +{ + if (octep_vf_alloc_ioq_vectors(oct)) + goto ioq_vector_err; + + if (octep_vf_enable_msix_range(oct)) + goto enable_msix_err; + + if (octep_vf_request_irqs(oct)) + goto request_irq_err; + + return 0; + +request_irq_err: + octep_vf_disable_msix(oct); +enable_msix_err: + octep_vf_free_ioq_vectors(oct); +ioq_vector_err: + return -1; +} + +/** + * octep_vf_clean_irqs() - free all interrupts and its resources. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_clean_irqs(struct octep_vf_device *oct) +{ + octep_vf_free_irqs(oct); + octep_vf_disable_msix(oct); + octep_vf_free_ioq_vectors(oct); +} + +/** + * octep_vf_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_vf_enable_ioq_irq(struct octep_vf_iq *iq, struct octep_vf_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 */ + smp_wmb(); + writeq(1UL << OCTEP_VF_OQ_INTR_RESEND_BIT, oq->pkts_sent_reg); + writeq(1UL << OCTEP_VF_IQ_INTR_RESEND_BIT, iq->inst_cnt_reg); +} + +/** + * octep_vf_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_vf_napi_poll(struct napi_struct *napi, int budget) +{ + struct octep_vf_ioq_vector *ioq_vector = + container_of(napi, struct octep_vf_ioq_vector, napi); + u32 tx_pending, rx_done; + + tx_pending = octep_vf_iq_process_completions(ioq_vector->iq, 64); + rx_done = octep_vf_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; + + if (likely(napi_complete_done(napi, rx_done))) + octep_vf_enable_ioq_irq(ioq_vector->iq, ioq_vector->oq); + + return rx_done; +} + +/** + * octep_vf_napi_add() - Add NAPI poll for all Tx/Rx queues. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_napi_add(struct octep_vf_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_vf_napi_poll); + oct->oq[i]->napi = &oct->ioq_vector[i]->napi; + } +} + +/** + * octep_vf_napi_delete() - delete NAPI poll callback for all Tx/Rx queues. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_napi_delete(struct octep_vf_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_vf_napi_enable() - enable NAPI for all Tx/Rx queues. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_napi_enable(struct octep_vf_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_vf_napi_disable() - disable NAPI for all Tx/Rx queues. + * + * @oct: Octeon device private data structure. + */ +static void octep_vf_napi_disable(struct octep_vf_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_vf_link_up(struct net_device *netdev) +{ + netif_carrier_on(netdev); + netif_tx_start_all_queues(netdev); +} + +static void octep_vf_set_rx_state(struct octep_vf_device *oct, bool up) +{ + int err; + + err = octep_vf_mbox_set_rx_state(oct, up); + if (err) + netdev_err(oct->netdev, "Set Rx state to %d failed with err:%d\n", up, err); +} + +static int octep_vf_get_link_status(struct octep_vf_device *oct) +{ + int err; + + err = octep_vf_mbox_get_link_status(oct, &oct->link_info.oper_up); + if (err) + netdev_err(oct->netdev, "Get link status failed with err:%d\n", err); + return oct->link_info.oper_up; +} + +static void octep_vf_set_link_status(struct octep_vf_device *oct, bool up) +{ + int err; + + err = octep_vf_mbox_set_link_status(oct, up); + if (err) { + netdev_err(oct->netdev, "Set link status to %d failed with err:%d\n", up, err); + return; + } + oct->link_info.oper_up = up; +} + +/** + * octep_vf_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_vf_open(struct net_device *netdev) +{ + struct octep_vf_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_vf_setup_iqs(oct)) + goto setup_iq_err; + if (octep_vf_setup_oqs(oct)) + goto setup_oq_err; + if (octep_vf_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_vf_napi_add(oct); + octep_vf_napi_enable(oct); + + oct->link_info.admin_up = 1; + octep_vf_set_rx_state(oct, true); + + ret = octep_vf_get_link_status(oct); + if (!ret) + octep_vf_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_vf_oq_dbell_init(oct); + + ret = octep_vf_get_link_status(oct); + if (ret) + octep_vf_link_up(netdev); + + return 0; + +set_queues_err: + octep_vf_napi_disable(oct); + octep_vf_napi_delete(oct); + octep_vf_clean_irqs(oct); +setup_irq_err: + octep_vf_free_oqs(oct); +setup_oq_err: + octep_vf_free_iqs(oct); +setup_iq_err: + return -1; +} + +/** + * octep_vf_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_vf_stop(struct net_device *netdev) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + + netdev_info(netdev, "Stopping the device ...\n"); + + /* Stop Tx from stack */ + netif_carrier_off(netdev); + netif_tx_disable(netdev); + + octep_vf_set_link_status(oct, false); + octep_vf_set_rx_state(oct, false); + + oct->link_info.admin_up = 0; + oct->link_info.oper_up = 0; + + oct->hw_ops.disable_interrupts(oct); + octep_vf_napi_disable(oct); + octep_vf_napi_delete(oct); + + octep_vf_clean_irqs(oct); + octep_vf_clean_iqs(oct); + + oct->hw_ops.disable_io_queues(oct); + oct->hw_ops.reset_io_queues(oct); + octep_vf_free_oqs(oct); + octep_vf_free_iqs(oct); + netdev_info(netdev, "Device stopped !!\n"); + return 0; +} + +/** + * octep_vf_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 int octep_vf_iq_full_check(struct octep_vf_iq *iq) +{ + int ret; + + ret = netif_subqueue_maybe_stop(iq->netdev, iq->q_no, IQ_INSTR_SPACE(iq), + OCTEP_VF_WAKE_QUEUE_THRESHOLD, + OCTEP_VF_WAKE_QUEUE_THRESHOLD); + switch (ret) { + case 0: /* Stopped the queue, since IQ is full */ + return 1; + case -1: /* + * Pending updates in write index from + * iq_process_completion in other cpus + * caused queues to get re-enabled after + * being stopped + */ + iq->stats.restart_cnt++; + fallthrough; + case 1: /* Queue left enabled, since IQ is not yet full*/ + return 0; + } + + return 1; +} + +/** + * octep_vf_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_vf_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + netdev_features_t feat = netdev->features; + struct octep_vf_tx_sglist_desc *sglist; + struct octep_vf_tx_buffer *tx_buffer; + struct octep_vf_tx_desc_hw *hw_desc; + struct skb_shared_info *shinfo; + struct octep_vf_instr_hdr *ih; + struct octep_vf_iq *iq; + skb_frag_t *frag; + u16 nr_frags, si; + int xmit_more; + u16 q_no, wi; + + if (skb_put_padto(skb, ETH_ZLEN)) + return NETDEV_TX_OK; + + 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]; + + 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->fw_info.pkind; + ih->fsz = oct->fw_info.fsz; + ih->tlen = skb->len + ih->fsz; + + 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; + + memset(sglist, 0, OCTEP_VF_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++; + } + hw_desc->dptr = tx_buffer->sglist_dma; + } + if (oct->fw_info.tx_ol_flags) { + if ((feat & (NETIF_F_TSO)) && (skb_is_gso(skb))) { + hw_desc->txm.ol_flags = OCTEP_VF_TX_OFFLOAD_CKSUM; + hw_desc->txm.ol_flags |= OCTEP_VF_TX_OFFLOAD_TSO; + hw_desc->txm.gso_size = skb_shinfo(skb)->gso_size; + hw_desc->txm.gso_segs = skb_shinfo(skb)->gso_segs; + } else if (feat & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { + hw_desc->txm.ol_flags = OCTEP_VF_TX_OFFLOAD_CKSUM; + } + /* due to ESR txm will be swapped by hw */ + hw_desc->txm64[0] = (__force u64)cpu_to_be64(hw_desc->txm64[0]); + } + + xmit_more = netdev_xmit_more(); + + netdev_tx_sent_queue(iq->netdev_q, skb->len); + + skb_tx_timestamp(skb); + iq->fill_cnt++; + wi++; + iq->host_write_index = wi & iq->ring_size_mask; + + /* octep_iq_full_check stops the queue and returns + * true if so, in case the queue has become full + * by inserting current packet. If so, we can + * go ahead and ring doorbell. + */ + if (!octep_vf_iq_full_check(iq) && xmit_more && + iq->fill_cnt < iq->fill_threshold) + return NETDEV_TX_OK; + + goto ring_dbell; + +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); +ring_dbell: + /* Flush the hw descriptors before writing to doorbell */ + smp_wmb(); + writel(iq->fill_cnt, iq->doorbell_reg); + iq->stats.instr_posted += iq->fill_cnt; + iq->fill_cnt = 0; + return NETDEV_TX_OK; +} + +int octep_vf_get_if_stats(struct octep_vf_device *oct) +{ + struct octep_vf_iface_rxtx_stats vf_stats; + int ret, size; + + memset(&vf_stats, 0, sizeof(struct octep_vf_iface_rxtx_stats)); + ret = octep_vf_mbox_bulk_read(oct, OCTEP_PFVF_MBOX_CMD_GET_STATS, + (u8 *)&vf_stats, &size); + + if (ret) + return ret; + + memcpy(&oct->iface_rx_stats, &vf_stats.iface_rx_stats, + sizeof(struct octep_vf_iface_rx_stats)); + memcpy(&oct->iface_tx_stats, &vf_stats.iface_tx_stats, + sizeof(struct octep_vf_iface_tx_stats)); + + return 0; +} + +int octep_vf_get_link_info(struct octep_vf_device *oct) +{ + int ret, size; + + ret = octep_vf_mbox_bulk_read(oct, OCTEP_PFVF_MBOX_CMD_GET_LINK_INFO, + (u8 *)&oct->link_info, &size); + if (ret) { + dev_err(&oct->pdev->dev, "Get VF link info failed via VF Mbox\n"); + return ret; + } + return 0; +} + +/** + * octep_vf_get_stats64() - Get Octeon network device statistics. + * + * @netdev: kernel network device. + * @stats: pointer to stats structure to be filled in. + */ +static void octep_vf_get_stats64(struct net_device *netdev, + struct rtnl_link_stats64 *stats) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + u64 tx_packets, tx_bytes, rx_packets, rx_bytes; + int q; + + tx_packets = 0; + tx_bytes = 0; + rx_packets = 0; + rx_bytes = 0; + for (q = 0; q < oct->num_oqs; q++) { + struct octep_vf_iq *iq = oct->iq[q]; + struct octep_vf_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; + if (!octep_vf_get_if_stats(oct)) { + stats->multicast = oct->iface_rx_stats.mcast_pkts; + stats->rx_errors = oct->iface_rx_stats.err_pkts; + stats->rx_dropped = oct->iface_rx_stats.dropped_pkts_fifo_full + + oct->iface_rx_stats.err_pkts; + stats->rx_missed_errors = oct->iface_rx_stats.dropped_pkts_fifo_full; + stats->tx_dropped = oct->iface_tx_stats.dropped; + } +} + +/** + * octep_vf_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_vf_tx_timeout_task(struct work_struct *work) +{ + struct octep_vf_device *oct = container_of(work, struct octep_vf_device, + tx_timeout_task); + struct net_device *netdev = oct->netdev; + + rtnl_lock(); + if (netif_running(netdev)) { + octep_vf_stop(netdev); + octep_vf_open(netdev); + } + rtnl_unlock(); + netdev_put(netdev, NULL); +} + +/** + * octep_vf_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_vf_tx_timeout(struct net_device *netdev, unsigned int txqueue) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + + netdev_hold(netdev, NULL, GFP_ATOMIC); + schedule_work(&oct->tx_timeout_task); +} + +static int octep_vf_set_mac(struct net_device *netdev, void *p) +{ + struct octep_vf_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_vf_mbox_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_vf_change_mtu(struct net_device *netdev, int new_mtu) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + struct octep_vf_iface_link_info *link_info; + int err; + + link_info = &oct->link_info; + if (link_info->mtu == new_mtu) + return 0; + + err = octep_vf_mbox_set_mtu(oct, new_mtu); + if (!err) { + oct->link_info.mtu = new_mtu; + netdev->mtu = new_mtu; + } + return err; +} + +static int octep_vf_set_features(struct net_device *netdev, + netdev_features_t features) +{ + struct octep_vf_device *oct = netdev_priv(netdev); + u16 rx_offloads = 0, tx_offloads = 0; + int err; + + /* We only support features received from firmware */ + if ((features & netdev->hw_features) != features) + return -EINVAL; + + if (features & NETIF_F_TSO) + tx_offloads |= OCTEP_VF_TX_OFFLOAD_TSO; + + if (features & NETIF_F_TSO6) + tx_offloads |= OCTEP_VF_TX_OFFLOAD_TSO; + + if (features & NETIF_F_IP_CSUM) + tx_offloads |= OCTEP_VF_TX_OFFLOAD_CKSUM; + + if (features & NETIF_F_IPV6_CSUM) + tx_offloads |= OCTEP_VF_TX_OFFLOAD_CKSUM; + + if (features & NETIF_F_RXCSUM) + rx_offloads |= OCTEP_VF_RX_OFFLOAD_CKSUM; + + err = octep_vf_mbox_set_offloads(oct, tx_offloads, rx_offloads); + if (!err) + netdev->features = features; + + return err; +} + +static const struct net_device_ops octep_vf_netdev_ops = { + .ndo_open = octep_vf_open, + .ndo_stop = octep_vf_stop, + .ndo_start_xmit = octep_vf_start_xmit, + .ndo_get_stats64 = octep_vf_get_stats64, + .ndo_tx_timeout = octep_vf_tx_timeout, + .ndo_set_mac_address = octep_vf_set_mac, + .ndo_change_mtu = octep_vf_change_mtu, + .ndo_set_features = octep_vf_set_features, +}; + +static const char *octep_vf_devid_to_str(struct octep_vf_device *oct) +{ + switch (oct->chip_id) { + case OCTEP_PCI_DEVICE_ID_CN93_VF: + return "CN93XX"; + case OCTEP_PCI_DEVICE_ID_CNF95N_VF: + return "CNF95N"; + case OCTEP_PCI_DEVICE_ID_CN10KA_VF: + return "CN10KA"; + case OCTEP_PCI_DEVICE_ID_CNF10KA_VF: + return "CNF10KA"; + case OCTEP_PCI_DEVICE_ID_CNF10KB_VF: + return "CNF10KB"; + case OCTEP_PCI_DEVICE_ID_CN10KB_VF: + return "CN10KB"; + default: + return "Unsupported"; + } +} + +/** + * octep_vf_device_setup() - Setup Octeon Device. + * + * @oct: Octeon device private data structure. + * + * Setup Octeon device hardware operations, configuration, etc ... + */ +int octep_vf_device_setup(struct octep_vf_device *oct) +{ + struct pci_dev *pdev = oct->pdev; + + /* allocate memory for oct->conf */ + oct->conf = kzalloc(sizeof(*oct->conf), GFP_KERNEL); + if (!oct->conf) + return -ENOMEM; + + /* Map BAR region 0 */ + oct->mmio.hw_addr = ioremap(pci_resource_start(oct->pdev, 0), + pci_resource_len(oct->pdev, 0)); + if (!oct->mmio.hw_addr) { + dev_err(&pdev->dev, + "Failed to remap BAR0; start=0x%llx len=0x%llx\n", + pci_resource_start(oct->pdev, 0), + pci_resource_len(oct->pdev, 0)); + goto ioremap_err; + } + oct->mmio.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_VF: + case OCTEP_PCI_DEVICE_ID_CNF95N_VF: + case OCTEP_PCI_DEVICE_ID_CN98_VF: + dev_info(&pdev->dev, "Setting up OCTEON %s VF PASS%d.%d\n", + octep_vf_devid_to_str(oct), OCTEP_VF_MAJOR_REV(oct), + OCTEP_VF_MINOR_REV(oct)); + octep_vf_device_setup_cn93(oct); + break; + case OCTEP_PCI_DEVICE_ID_CNF10KA_VF: + case OCTEP_PCI_DEVICE_ID_CN10KA_VF: + case OCTEP_PCI_DEVICE_ID_CNF10KB_VF: + case OCTEP_PCI_DEVICE_ID_CN10KB_VF: + dev_info(&pdev->dev, "Setting up OCTEON %s VF PASS%d.%d\n", + octep_vf_devid_to_str(oct), OCTEP_VF_MAJOR_REV(oct), + OCTEP_VF_MINOR_REV(oct)); + octep_vf_device_setup_cnxk(oct); + break; + default: + dev_err(&pdev->dev, "Unsupported device\n"); + goto unsupported_dev; + } + + return 0; + +unsupported_dev: + iounmap(oct->mmio.hw_addr); +ioremap_err: + kfree(oct->conf); + return -EOPNOTSUPP; +} + +/** + * octep_vf_device_cleanup() - Cleanup Octeon Device. + * + * @oct: Octeon device private data structure. + * + * Cleanup Octeon device allocated resources. + */ +static void octep_vf_device_cleanup(struct octep_vf_device *oct) +{ + dev_info(&oct->pdev->dev, "Cleaning up Octeon Device ...\n"); + + if (oct->mmio.mapped) + iounmap(oct->mmio.hw_addr); + + kfree(oct->conf); + oct->conf = NULL; +} + +static int octep_vf_get_mac_addr(struct octep_vf_device *oct, u8 *addr) +{ + return octep_vf_mbox_get_mac_addr(oct, addr); +} + +/** + * octep_vf_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_vf_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct octep_vf_device *octep_vf_dev; + 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 disable_pci_device; + } + + err = pci_request_mem_regions(pdev, OCTEP_VF_DRV_NAME); + if (err) { + dev_err(&pdev->dev, "Failed to map PCI memory regions\n"); + goto disable_pci_device; + } + + pci_set_master(pdev); + + netdev = alloc_etherdev_mq(sizeof(struct octep_vf_device), + OCTEP_VF_MAX_QUEUES); + if (!netdev) { + dev_err(&pdev->dev, "Failed to allocate netdev\n"); + err = -ENOMEM; + goto mem_regions_release; + } + SET_NETDEV_DEV(netdev, &pdev->dev); + + octep_vf_dev = netdev_priv(netdev); + octep_vf_dev->netdev = netdev; + octep_vf_dev->pdev = pdev; + octep_vf_dev->dev = &pdev->dev; + pci_set_drvdata(pdev, octep_vf_dev); + + err = octep_vf_device_setup(octep_vf_dev); + if (err) { + dev_err(&pdev->dev, "Device setup failed\n"); + goto netdevice_free; + } + INIT_WORK(&octep_vf_dev->tx_timeout_task, octep_vf_tx_timeout_task); + + netdev->netdev_ops = &octep_vf_netdev_ops; + octep_vf_set_ethtool_ops(netdev); + netif_carrier_off(netdev); + + if (octep_vf_setup_mbox(octep_vf_dev)) { + dev_err(&pdev->dev, "VF Mailbox setup failed\n"); + err = -ENOMEM; + goto device_cleanup; + } + + if (octep_vf_mbox_version_check(octep_vf_dev)) { + dev_err(&pdev->dev, "PF VF Mailbox version mismatch\n"); + err = -EINVAL; + goto delete_mbox; + } + + if (octep_vf_mbox_get_fw_info(octep_vf_dev)) { + dev_err(&pdev->dev, "unable to get fw info\n"); + err = -EINVAL; + goto delete_mbox; + } + + netdev->hw_features = NETIF_F_SG; + if (OCTEP_VF_TX_IP_CSUM(octep_vf_dev->fw_info.tx_ol_flags)) + netdev->hw_features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); + + if (OCTEP_VF_RX_IP_CSUM(octep_vf_dev->fw_info.rx_ol_flags)) + netdev->hw_features |= NETIF_F_RXCSUM; + + netdev->min_mtu = OCTEP_VF_MIN_MTU; + netdev->max_mtu = OCTEP_VF_MAX_MTU; + netdev->mtu = OCTEP_VF_DEFAULT_MTU; + + if (OCTEP_VF_TX_TSO(octep_vf_dev->fw_info.tx_ol_flags)) { + netdev->hw_features |= NETIF_F_TSO; + netif_set_tso_max_size(netdev, netdev->max_mtu); + } + + netdev->features |= netdev->hw_features; + octep_vf_get_mac_addr(octep_vf_dev, octep_vf_dev->mac_addr); + eth_hw_addr_set(netdev, octep_vf_dev->mac_addr); + err = register_netdev(netdev); + if (err) { + dev_err(&pdev->dev, "Failed to register netdev\n"); + goto delete_mbox; + } + dev_info(&pdev->dev, "Device probe successful\n"); + return 0; + +delete_mbox: + octep_vf_delete_mbox(octep_vf_dev); +device_cleanup: + octep_vf_device_cleanup(octep_vf_dev); +netdevice_free: + free_netdev(netdev); +mem_regions_release: + pci_release_mem_regions(pdev); +disable_pci_device: + pci_disable_device(pdev); + dev_err(&pdev->dev, "Device probe failed\n"); + return err; +} + +/** + * octep_vf_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_vf_remove(struct pci_dev *pdev) +{ + struct octep_vf_device *oct = pci_get_drvdata(pdev); + struct net_device *netdev; + + if (!oct) + return; + + octep_vf_mbox_dev_remove(oct); + cancel_work_sync(&oct->tx_timeout_task); + netdev = oct->netdev; + if (netdev->reg_state == NETREG_REGISTERED) + unregister_netdev(netdev); + octep_vf_delete_mbox(oct); + octep_vf_device_cleanup(oct); + pci_release_mem_regions(pdev); + free_netdev(netdev); + pci_disable_device(pdev); +} + +static struct pci_driver octep_vf_driver = { + .name = OCTEP_VF_DRV_NAME, + .id_table = octep_vf_pci_id_tbl, + .probe = octep_vf_probe, + .remove = octep_vf_remove, +}; + +/** + * octep_vf_init_module() - Module initialization. + * + * create common resource for the driver and register PCI driver. + */ +static int __init octep_vf_init_module(void) +{ + int ret; + + pr_info("%s: Loading %s ...\n", OCTEP_VF_DRV_NAME, OCTEP_VF_DRV_STRING); + + ret = pci_register_driver(&octep_vf_driver); + if (ret < 0) { + pr_err("%s: Failed to register PCI driver; err=%d\n", + OCTEP_VF_DRV_NAME, ret); + return ret; + } + + return ret; +} + +/** + * octep_vf_exit_module() - Module exit routine. + * + * unregister the driver with PCI subsystem and cleanup common resources. + */ +static void __exit octep_vf_exit_module(void) +{ + pr_info("%s: Unloading ...\n", OCTEP_VF_DRV_NAME); + + pci_unregister_driver(&octep_vf_driver); + + pr_info("%s: Unloading complete\n", OCTEP_VF_DRV_NAME); +} + +module_init(octep_vf_init_module); +module_exit(octep_vf_exit_module); |