diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/nfp_net_common.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 3938 |
1 files changed, 3938 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c new file mode 100644 index 000000000..d288c7eeb --- /dev/null +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c @@ -0,0 +1,3938 @@ +/* + * Copyright (C) 2015-2017 Netronome Systems, Inc. + * + * This software is dual licensed under the GNU General License Version 2, + * June 1991 as shown in the file COPYING in the top-level directory of this + * source tree or the BSD 2-Clause License provided below. You have the + * option to license this software under the complete terms of either license. + * + * The BSD 2-Clause License: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * 2. Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +/* + * nfp_net_common.c + * Netronome network device driver: Common functions between PF and VF + * Authors: Jakub Kicinski <jakub.kicinski@netronome.com> + * Jason McMullan <jason.mcmullan@netronome.com> + * Rolf Neugebauer <rolf.neugebauer@netronome.com> + * Brad Petrus <brad.petrus@netronome.com> + * Chris Telfer <chris.telfer@netronome.com> + */ + +#include <linux/bitfield.h> +#include <linux/bpf.h> +#include <linux/bpf_trace.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/fs.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/interrupt.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/mm.h> +#include <linux/overflow.h> +#include <linux/page_ref.h> +#include <linux/pci.h> +#include <linux/pci_regs.h> +#include <linux/msi.h> +#include <linux/ethtool.h> +#include <linux/log2.h> +#include <linux/if_vlan.h> +#include <linux/random.h> +#include <linux/vmalloc.h> +#include <linux/ktime.h> + +#include <net/switchdev.h> +#include <net/vxlan.h> + +#include "nfpcore/nfp_nsp.h" +#include "nfp_app.h" +#include "nfp_net_ctrl.h" +#include "nfp_net.h" +#include "nfp_net_sriov.h" +#include "nfp_port.h" + +/** + * nfp_net_get_fw_version() - Read and parse the FW version + * @fw_ver: Output fw_version structure to read to + * @ctrl_bar: Mapped address of the control BAR + */ +void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver, + void __iomem *ctrl_bar) +{ + u32 reg; + + reg = readl(ctrl_bar + NFP_NET_CFG_VERSION); + put_unaligned_le32(reg, fw_ver); +} + +static dma_addr_t nfp_net_dma_map_rx(struct nfp_net_dp *dp, void *frag) +{ + return dma_map_single_attrs(dp->dev, frag + NFP_NET_RX_BUF_HEADROOM, + dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, + dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC); +} + +static void +nfp_net_dma_sync_dev_rx(const struct nfp_net_dp *dp, dma_addr_t dma_addr) +{ + dma_sync_single_for_device(dp->dev, dma_addr, + dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, + dp->rx_dma_dir); +} + +static void nfp_net_dma_unmap_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr) +{ + dma_unmap_single_attrs(dp->dev, dma_addr, + dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA, + dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC); +} + +static void nfp_net_dma_sync_cpu_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr, + unsigned int len) +{ + dma_sync_single_for_cpu(dp->dev, dma_addr - NFP_NET_RX_BUF_HEADROOM, + len, dp->rx_dma_dir); +} + +/* Firmware reconfig + * + * Firmware reconfig may take a while so we have two versions of it - + * synchronous and asynchronous (posted). All synchronous callers are holding + * RTNL so we don't have to worry about serializing them. + */ +static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update) +{ + nn_writel(nn, NFP_NET_CFG_UPDATE, update); + /* ensure update is written before pinging HW */ + nn_pci_flush(nn); + nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1); +} + +/* Pass 0 as update to run posted reconfigs. */ +static void nfp_net_reconfig_start_async(struct nfp_net *nn, u32 update) +{ + update |= nn->reconfig_posted; + nn->reconfig_posted = 0; + + nfp_net_reconfig_start(nn, update); + + nn->reconfig_timer_active = true; + mod_timer(&nn->reconfig_timer, jiffies + NFP_NET_POLL_TIMEOUT * HZ); +} + +static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check) +{ + u32 reg; + + reg = nn_readl(nn, NFP_NET_CFG_UPDATE); + if (reg == 0) + return true; + if (reg & NFP_NET_CFG_UPDATE_ERR) { + nn_err(nn, "Reconfig error: 0x%08x\n", reg); + return true; + } else if (last_check) { + nn_err(nn, "Reconfig timeout: 0x%08x\n", reg); + return true; + } + + return false; +} + +static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline) +{ + bool timed_out = false; + + /* Poll update field, waiting for NFP to ack the config */ + while (!nfp_net_reconfig_check_done(nn, timed_out)) { + msleep(1); + timed_out = time_is_before_eq_jiffies(deadline); + } + + if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR) + return -EIO; + + return timed_out ? -EIO : 0; +} + +static void nfp_net_reconfig_timer(struct timer_list *t) +{ + struct nfp_net *nn = from_timer(nn, t, reconfig_timer); + + spin_lock_bh(&nn->reconfig_lock); + + nn->reconfig_timer_active = false; + + /* If sync caller is present it will take over from us */ + if (nn->reconfig_sync_present) + goto done; + + /* Read reconfig status and report errors */ + nfp_net_reconfig_check_done(nn, true); + + if (nn->reconfig_posted) + nfp_net_reconfig_start_async(nn, 0); +done: + spin_unlock_bh(&nn->reconfig_lock); +} + +/** + * nfp_net_reconfig_post() - Post async reconfig request + * @nn: NFP Net device to reconfigure + * @update: The value for the update field in the BAR config + * + * Record FW reconfiguration request. Reconfiguration will be kicked off + * whenever reconfiguration machinery is idle. Multiple requests can be + * merged together! + */ +static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update) +{ + spin_lock_bh(&nn->reconfig_lock); + + /* Sync caller will kick off async reconf when it's done, just post */ + if (nn->reconfig_sync_present) { + nn->reconfig_posted |= update; + goto done; + } + + /* Opportunistically check if the previous command is done */ + if (!nn->reconfig_timer_active || + nfp_net_reconfig_check_done(nn, false)) + nfp_net_reconfig_start_async(nn, update); + else + nn->reconfig_posted |= update; +done: + spin_unlock_bh(&nn->reconfig_lock); +} + +static void nfp_net_reconfig_sync_enter(struct nfp_net *nn) +{ + bool cancelled_timer = false; + u32 pre_posted_requests; + + spin_lock_bh(&nn->reconfig_lock); + + nn->reconfig_sync_present = true; + + if (nn->reconfig_timer_active) { + nn->reconfig_timer_active = false; + cancelled_timer = true; + } + pre_posted_requests = nn->reconfig_posted; + nn->reconfig_posted = 0; + + spin_unlock_bh(&nn->reconfig_lock); + + if (cancelled_timer) { + del_timer_sync(&nn->reconfig_timer); + nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires); + } + + /* Run the posted reconfigs which were issued before we started */ + if (pre_posted_requests) { + nfp_net_reconfig_start(nn, pre_posted_requests); + nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT); + } +} + +static void nfp_net_reconfig_wait_posted(struct nfp_net *nn) +{ + nfp_net_reconfig_sync_enter(nn); + + spin_lock_bh(&nn->reconfig_lock); + nn->reconfig_sync_present = false; + spin_unlock_bh(&nn->reconfig_lock); +} + +/** + * nfp_net_reconfig() - Reconfigure the firmware + * @nn: NFP Net device to reconfigure + * @update: The value for the update field in the BAR config + * + * Write the update word to the BAR and ping the reconfig queue. The + * poll until the firmware has acknowledged the update by zeroing the + * update word. + * + * Return: Negative errno on error, 0 on success + */ +int nfp_net_reconfig(struct nfp_net *nn, u32 update) +{ + int ret; + + nfp_net_reconfig_sync_enter(nn); + + nfp_net_reconfig_start(nn, update); + ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT); + + spin_lock_bh(&nn->reconfig_lock); + + if (nn->reconfig_posted) + nfp_net_reconfig_start_async(nn, 0); + + nn->reconfig_sync_present = false; + + spin_unlock_bh(&nn->reconfig_lock); + + return ret; +} + +/** + * nfp_net_reconfig_mbox() - Reconfigure the firmware via the mailbox + * @nn: NFP Net device to reconfigure + * @mbox_cmd: The value for the mailbox command + * + * Helper function for mailbox updates + * + * Return: Negative errno on error, 0 on success + */ +static int nfp_net_reconfig_mbox(struct nfp_net *nn, u32 mbox_cmd) +{ + u32 mbox = nn->tlv_caps.mbox_off; + int ret; + + if (!nfp_net_has_mbox(&nn->tlv_caps)) { + nn_err(nn, "no mailbox present, command: %u\n", mbox_cmd); + return -EIO; + } + + nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd); + + ret = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX); + if (ret) { + nn_err(nn, "Mailbox update error\n"); + return ret; + } + + return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET); +} + +/* Interrupt configuration and handling + */ + +/** + * nfp_net_irq_unmask() - Unmask automasked interrupt + * @nn: NFP Network structure + * @entry_nr: MSI-X table entry + * + * Clear the ICR for the IRQ entry. + */ +static void nfp_net_irq_unmask(struct nfp_net *nn, unsigned int entry_nr) +{ + nn_writeb(nn, NFP_NET_CFG_ICR(entry_nr), NFP_NET_CFG_ICR_UNMASKED); + nn_pci_flush(nn); +} + +/** + * nfp_net_irqs_alloc() - allocates MSI-X irqs + * @pdev: PCI device structure + * @irq_entries: Array to be initialized and used to hold the irq entries + * @min_irqs: Minimal acceptable number of interrupts + * @wanted_irqs: Target number of interrupts to allocate + * + * Return: Number of irqs obtained or 0 on error. + */ +unsigned int +nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries, + unsigned int min_irqs, unsigned int wanted_irqs) +{ + unsigned int i; + int got_irqs; + + for (i = 0; i < wanted_irqs; i++) + irq_entries[i].entry = i; + + got_irqs = pci_enable_msix_range(pdev, irq_entries, + min_irqs, wanted_irqs); + if (got_irqs < 0) { + dev_err(&pdev->dev, "Failed to enable %d-%d MSI-X (err=%d)\n", + min_irqs, wanted_irqs, got_irqs); + return 0; + } + + if (got_irqs < wanted_irqs) + dev_warn(&pdev->dev, "Unable to allocate %d IRQs got only %d\n", + wanted_irqs, got_irqs); + + return got_irqs; +} + +/** + * nfp_net_irqs_assign() - Assign interrupts allocated externally to netdev + * @nn: NFP Network structure + * @irq_entries: Table of allocated interrupts + * @n: Size of @irq_entries (number of entries to grab) + * + * After interrupts are allocated with nfp_net_irqs_alloc() this function + * should be called to assign them to a specific netdev (port). + */ +void +nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries, + unsigned int n) +{ + struct nfp_net_dp *dp = &nn->dp; + + nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS; + dp->num_r_vecs = nn->max_r_vecs; + + memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n); + + if (dp->num_rx_rings > dp->num_r_vecs || + dp->num_tx_rings > dp->num_r_vecs) + dev_warn(nn->dp.dev, "More rings (%d,%d) than vectors (%d).\n", + dp->num_rx_rings, dp->num_tx_rings, + dp->num_r_vecs); + + dp->num_rx_rings = min(dp->num_r_vecs, dp->num_rx_rings); + dp->num_tx_rings = min(dp->num_r_vecs, dp->num_tx_rings); + dp->num_stack_tx_rings = dp->num_tx_rings; +} + +/** + * nfp_net_irqs_disable() - Disable interrupts + * @pdev: PCI device structure + * + * Undoes what @nfp_net_irqs_alloc() does. + */ +void nfp_net_irqs_disable(struct pci_dev *pdev) +{ + pci_disable_msix(pdev); +} + +/** + * nfp_net_irq_rxtx() - Interrupt service routine for RX/TX rings. + * @irq: Interrupt + * @data: Opaque data structure + * + * Return: Indicate if the interrupt has been handled. + */ +static irqreturn_t nfp_net_irq_rxtx(int irq, void *data) +{ + struct nfp_net_r_vector *r_vec = data; + + napi_schedule_irqoff(&r_vec->napi); + + /* The FW auto-masks any interrupt, either via the MASK bit in + * the MSI-X table or via the per entry ICR field. So there + * is no need to disable interrupts here. + */ + return IRQ_HANDLED; +} + +static irqreturn_t nfp_ctrl_irq_rxtx(int irq, void *data) +{ + struct nfp_net_r_vector *r_vec = data; + + tasklet_schedule(&r_vec->tasklet); + + return IRQ_HANDLED; +} + +/** + * nfp_net_read_link_status() - Reread link status from control BAR + * @nn: NFP Network structure + */ +static void nfp_net_read_link_status(struct nfp_net *nn) +{ + unsigned long flags; + bool link_up; + u32 sts; + + spin_lock_irqsave(&nn->link_status_lock, flags); + + sts = nn_readl(nn, NFP_NET_CFG_STS); + link_up = !!(sts & NFP_NET_CFG_STS_LINK); + + if (nn->link_up == link_up) + goto out; + + nn->link_up = link_up; + if (nn->port) + set_bit(NFP_PORT_CHANGED, &nn->port->flags); + + if (nn->link_up) { + netif_carrier_on(nn->dp.netdev); + netdev_info(nn->dp.netdev, "NIC Link is Up\n"); + } else { + netif_carrier_off(nn->dp.netdev); + netdev_info(nn->dp.netdev, "NIC Link is Down\n"); + } +out: + spin_unlock_irqrestore(&nn->link_status_lock, flags); +} + +/** + * nfp_net_irq_lsc() - Interrupt service routine for link state changes + * @irq: Interrupt + * @data: Opaque data structure + * + * Return: Indicate if the interrupt has been handled. + */ +static irqreturn_t nfp_net_irq_lsc(int irq, void *data) +{ + struct nfp_net *nn = data; + struct msix_entry *entry; + + entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX]; + + nfp_net_read_link_status(nn); + + nfp_net_irq_unmask(nn, entry->entry); + + return IRQ_HANDLED; +} + +/** + * nfp_net_irq_exn() - Interrupt service routine for exceptions + * @irq: Interrupt + * @data: Opaque data structure + * + * Return: Indicate if the interrupt has been handled. + */ +static irqreturn_t nfp_net_irq_exn(int irq, void *data) +{ + struct nfp_net *nn = data; + + nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__); + /* XXX TO BE IMPLEMENTED */ + return IRQ_HANDLED; +} + +/** + * nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring + * @tx_ring: TX ring structure + * @r_vec: IRQ vector servicing this ring + * @idx: Ring index + * @is_xdp: Is this an XDP TX ring? + */ +static void +nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring, + struct nfp_net_r_vector *r_vec, unsigned int idx, + bool is_xdp) +{ + struct nfp_net *nn = r_vec->nfp_net; + + tx_ring->idx = idx; + tx_ring->r_vec = r_vec; + tx_ring->is_xdp = is_xdp; + u64_stats_init(&tx_ring->r_vec->tx_sync); + + tx_ring->qcidx = tx_ring->idx * nn->stride_tx; + tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx); +} + +/** + * nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring + * @rx_ring: RX ring structure + * @r_vec: IRQ vector servicing this ring + * @idx: Ring index + */ +static void +nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring, + struct nfp_net_r_vector *r_vec, unsigned int idx) +{ + struct nfp_net *nn = r_vec->nfp_net; + + rx_ring->idx = idx; + rx_ring->r_vec = r_vec; + u64_stats_init(&rx_ring->r_vec->rx_sync); + + rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx; + rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx); +} + +/** + * nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN) + * @nn: NFP Network structure + * @ctrl_offset: Control BAR offset where IRQ configuration should be written + * @format: printf-style format to construct the interrupt name + * @name: Pointer to allocated space for interrupt name + * @name_sz: Size of space for interrupt name + * @vector_idx: Index of MSI-X vector used for this interrupt + * @handler: IRQ handler to register for this interrupt + */ +static int +nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset, + const char *format, char *name, size_t name_sz, + unsigned int vector_idx, irq_handler_t handler) +{ + struct msix_entry *entry; + int err; + + entry = &nn->irq_entries[vector_idx]; + + snprintf(name, name_sz, format, nfp_net_name(nn)); + err = request_irq(entry->vector, handler, 0, name, nn); + if (err) { + nn_err(nn, "Failed to request IRQ %d (err=%d).\n", + entry->vector, err); + return err; + } + nn_writeb(nn, ctrl_offset, entry->entry); + nfp_net_irq_unmask(nn, entry->entry); + + return 0; +} + +/** + * nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN) + * @nn: NFP Network structure + * @ctrl_offset: Control BAR offset where IRQ configuration should be written + * @vector_idx: Index of MSI-X vector used for this interrupt + */ +static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset, + unsigned int vector_idx) +{ + nn_writeb(nn, ctrl_offset, 0xff); + nn_pci_flush(nn); + free_irq(nn->irq_entries[vector_idx].vector, nn); +} + +/* Transmit + * + * One queue controller peripheral queue is used for transmit. The + * driver en-queues packets for transmit by advancing the write + * pointer. The device indicates that packets have transmitted by + * advancing the read pointer. The driver maintains a local copy of + * the read and write pointer in @struct nfp_net_tx_ring. The driver + * keeps @wr_p in sync with the queue controller write pointer and can + * determine how many packets have been transmitted by comparing its + * copy of the read pointer @rd_p with the read pointer maintained by + * the queue controller peripheral. + */ + +/** + * nfp_net_tx_full() - Check if the TX ring is full + * @tx_ring: TX ring to check + * @dcnt: Number of descriptors that need to be enqueued (must be >= 1) + * + * This function checks, based on the *host copy* of read/write + * pointer if a given TX ring is full. The real TX queue may have + * some newly made available slots. + * + * Return: True if the ring is full. + */ +static int nfp_net_tx_full(struct nfp_net_tx_ring *tx_ring, int dcnt) +{ + return (tx_ring->wr_p - tx_ring->rd_p) >= (tx_ring->cnt - dcnt); +} + +/* Wrappers for deciding when to stop and restart TX queues */ +static int nfp_net_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring) +{ + return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4); +} + +static int nfp_net_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring) +{ + return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1); +} + +/** + * nfp_net_tx_ring_stop() - stop tx ring + * @nd_q: netdev queue + * @tx_ring: driver tx queue structure + * + * Safely stop TX ring. Remember that while we are running .start_xmit() + * someone else may be cleaning the TX ring completions so we need to be + * extra careful here. + */ +static void nfp_net_tx_ring_stop(struct netdev_queue *nd_q, + struct nfp_net_tx_ring *tx_ring) +{ + netif_tx_stop_queue(nd_q); + + /* We can race with the TX completion out of NAPI so recheck */ + smp_mb(); + if (unlikely(nfp_net_tx_ring_should_wake(tx_ring))) + netif_tx_start_queue(nd_q); +} + +/** + * nfp_net_tx_tso() - Set up Tx descriptor for LSO + * @r_vec: per-ring structure + * @txbuf: Pointer to driver soft TX descriptor + * @txd: Pointer to HW TX descriptor + * @skb: Pointer to SKB + * + * Set up Tx descriptor for LSO, do nothing for non-LSO skbs. + * Return error on packet header greater than maximum supported LSO header size. + */ +static void nfp_net_tx_tso(struct nfp_net_r_vector *r_vec, + struct nfp_net_tx_buf *txbuf, + struct nfp_net_tx_desc *txd, struct sk_buff *skb) +{ + u32 hdrlen; + u16 mss; + + if (!skb_is_gso(skb)) + return; + + if (!skb->encapsulation) { + txd->l3_offset = skb_network_offset(skb); + txd->l4_offset = skb_transport_offset(skb); + hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); + } else { + txd->l3_offset = skb_inner_network_offset(skb); + txd->l4_offset = skb_inner_transport_offset(skb); + hdrlen = skb_inner_transport_header(skb) - skb->data + + inner_tcp_hdrlen(skb); + } + + txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs; + txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1); + + mss = skb_shinfo(skb)->gso_size & PCIE_DESC_TX_MSS_MASK; + txd->lso_hdrlen = hdrlen; + txd->mss = cpu_to_le16(mss); + txd->flags |= PCIE_DESC_TX_LSO; + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_lso++; + u64_stats_update_end(&r_vec->tx_sync); +} + +/** + * nfp_net_tx_csum() - Set TX CSUM offload flags in TX descriptor + * @dp: NFP Net data path struct + * @r_vec: per-ring structure + * @txbuf: Pointer to driver soft TX descriptor + * @txd: Pointer to TX descriptor + * @skb: Pointer to SKB + * + * This function sets the TX checksum flags in the TX descriptor based + * on the configuration and the protocol of the packet to be transmitted. + */ +static void nfp_net_tx_csum(struct nfp_net_dp *dp, + struct nfp_net_r_vector *r_vec, + struct nfp_net_tx_buf *txbuf, + struct nfp_net_tx_desc *txd, struct sk_buff *skb) +{ + struct ipv6hdr *ipv6h; + struct iphdr *iph; + u8 l4_hdr; + + if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM)) + return; + + if (skb->ip_summed != CHECKSUM_PARTIAL) + return; + + txd->flags |= PCIE_DESC_TX_CSUM; + if (skb->encapsulation) + txd->flags |= PCIE_DESC_TX_ENCAP; + + iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); + ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); + + if (iph->version == 4) { + txd->flags |= PCIE_DESC_TX_IP4_CSUM; + l4_hdr = iph->protocol; + } else if (ipv6h->version == 6) { + l4_hdr = ipv6h->nexthdr; + } else { + nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version); + return; + } + + switch (l4_hdr) { + case IPPROTO_TCP: + txd->flags |= PCIE_DESC_TX_TCP_CSUM; + break; + case IPPROTO_UDP: + txd->flags |= PCIE_DESC_TX_UDP_CSUM; + break; + default: + nn_dp_warn(dp, "partial checksum but l4 proto=%x!\n", l4_hdr); + return; + } + + u64_stats_update_begin(&r_vec->tx_sync); + if (skb->encapsulation) + r_vec->hw_csum_tx_inner += txbuf->pkt_cnt; + else + r_vec->hw_csum_tx += txbuf->pkt_cnt; + u64_stats_update_end(&r_vec->tx_sync); +} + +static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring) +{ + wmb(); + nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add); + tx_ring->wr_ptr_add = 0; +} + +static int nfp_net_prep_port_id(struct sk_buff *skb) +{ + struct metadata_dst *md_dst = skb_metadata_dst(skb); + unsigned char *data; + + if (likely(!md_dst)) + return 0; + if (unlikely(md_dst->type != METADATA_HW_PORT_MUX)) + return 0; + + if (unlikely(skb_cow_head(skb, 8))) + return -ENOMEM; + + data = skb_push(skb, 8); + put_unaligned_be32(NFP_NET_META_PORTID, data); + put_unaligned_be32(md_dst->u.port_info.port_id, data + 4); + + return 8; +} + +/** + * nfp_net_tx() - Main transmit entry point + * @skb: SKB to transmit + * @netdev: netdev structure + * + * Return: NETDEV_TX_OK on success. + */ +static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + const struct skb_frag_struct *frag; + struct nfp_net_tx_desc *txd, txdg; + int f, nr_frags, wr_idx, md_bytes; + struct nfp_net_tx_ring *tx_ring; + struct nfp_net_r_vector *r_vec; + struct nfp_net_tx_buf *txbuf; + struct netdev_queue *nd_q; + struct nfp_net_dp *dp; + dma_addr_t dma_addr; + unsigned int fsize; + u16 qidx; + + dp = &nn->dp; + qidx = skb_get_queue_mapping(skb); + tx_ring = &dp->tx_rings[qidx]; + r_vec = tx_ring->r_vec; + nd_q = netdev_get_tx_queue(dp->netdev, qidx); + + nr_frags = skb_shinfo(skb)->nr_frags; + + if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) { + nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n", + qidx, tx_ring->wr_p, tx_ring->rd_p); + netif_tx_stop_queue(nd_q); + nfp_net_tx_xmit_more_flush(tx_ring); + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_busy++; + u64_stats_update_end(&r_vec->tx_sync); + return NETDEV_TX_BUSY; + } + + md_bytes = nfp_net_prep_port_id(skb); + if (unlikely(md_bytes < 0)) { + nfp_net_tx_xmit_more_flush(tx_ring); + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; + } + + /* Start with the head skbuf */ + dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), + DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_free; + + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + + /* Stash the soft descriptor of the head then initialize it */ + txbuf = &tx_ring->txbufs[wr_idx]; + txbuf->skb = skb; + txbuf->dma_addr = dma_addr; + txbuf->fidx = -1; + txbuf->pkt_cnt = 1; + txbuf->real_len = skb->len; + + /* Build TX descriptor */ + txd = &tx_ring->txds[wr_idx]; + txd->offset_eop = (nr_frags ? 0 : PCIE_DESC_TX_EOP) | md_bytes; + txd->dma_len = cpu_to_le16(skb_headlen(skb)); + nfp_desc_set_dma_addr(txd, dma_addr); + txd->data_len = cpu_to_le16(skb->len); + + txd->flags = 0; + txd->mss = 0; + txd->lso_hdrlen = 0; + + /* Do not reorder - tso may adjust pkt cnt, vlan may override fields */ + nfp_net_tx_tso(r_vec, txbuf, txd, skb); + nfp_net_tx_csum(dp, r_vec, txbuf, txd, skb); + if (skb_vlan_tag_present(skb) && dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN) { + txd->flags |= PCIE_DESC_TX_VLAN; + txd->vlan = cpu_to_le16(skb_vlan_tag_get(skb)); + } + + /* Gather DMA */ + if (nr_frags > 0) { + /* all descs must match except for in addr, length and eop */ + txdg = *txd; + + for (f = 0; f < nr_frags; f++) { + frag = &skb_shinfo(skb)->frags[f]; + fsize = skb_frag_size(frag); + + dma_addr = skb_frag_dma_map(dp->dev, frag, 0, + fsize, DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_unmap; + + wr_idx = D_IDX(tx_ring, wr_idx + 1); + tx_ring->txbufs[wr_idx].skb = skb; + tx_ring->txbufs[wr_idx].dma_addr = dma_addr; + tx_ring->txbufs[wr_idx].fidx = f; + + txd = &tx_ring->txds[wr_idx]; + *txd = txdg; + txd->dma_len = cpu_to_le16(fsize); + nfp_desc_set_dma_addr(txd, dma_addr); + txd->offset_eop |= + (f == nr_frags - 1) ? PCIE_DESC_TX_EOP : 0; + } + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_gather++; + u64_stats_update_end(&r_vec->tx_sync); + } + + netdev_tx_sent_queue(nd_q, txbuf->real_len); + + skb_tx_timestamp(skb); + + tx_ring->wr_p += nr_frags + 1; + if (nfp_net_tx_ring_should_stop(tx_ring)) + nfp_net_tx_ring_stop(nd_q, tx_ring); + + tx_ring->wr_ptr_add += nr_frags + 1; + if (!skb->xmit_more || netif_xmit_stopped(nd_q)) + nfp_net_tx_xmit_more_flush(tx_ring); + + return NETDEV_TX_OK; + +err_unmap: + while (--f >= 0) { + frag = &skb_shinfo(skb)->frags[f]; + dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, + skb_frag_size(frag), DMA_TO_DEVICE); + tx_ring->txbufs[wr_idx].skb = NULL; + tx_ring->txbufs[wr_idx].dma_addr = 0; + tx_ring->txbufs[wr_idx].fidx = -2; + wr_idx = wr_idx - 1; + if (wr_idx < 0) + wr_idx += tx_ring->cnt; + } + dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr, + skb_headlen(skb), DMA_TO_DEVICE); + tx_ring->txbufs[wr_idx].skb = NULL; + tx_ring->txbufs[wr_idx].dma_addr = 0; + tx_ring->txbufs[wr_idx].fidx = -2; +err_free: + nn_dp_warn(dp, "Failed to map DMA TX buffer\n"); + nfp_net_tx_xmit_more_flush(tx_ring); + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_errors++; + u64_stats_update_end(&r_vec->tx_sync); + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} + +/** + * nfp_net_tx_complete() - Handled completed TX packets + * @tx_ring: TX ring structure + * @budget: NAPI budget (only used as bool to determine if in NAPI context) + */ +static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + const struct skb_frag_struct *frag; + struct netdev_queue *nd_q; + u32 done_pkts = 0, done_bytes = 0; + struct sk_buff *skb; + int todo, nr_frags; + u32 qcp_rd_p; + int fidx; + int idx; + + if (tx_ring->wr_p == tx_ring->rd_p) + return; + + /* Work out how many descriptors have been transmitted */ + qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q); + + if (qcp_rd_p == tx_ring->qcp_rd_p) + return; + + todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); + + while (todo--) { + idx = D_IDX(tx_ring, tx_ring->rd_p++); + + skb = tx_ring->txbufs[idx].skb; + if (!skb) + continue; + + nr_frags = skb_shinfo(skb)->nr_frags; + fidx = tx_ring->txbufs[idx].fidx; + + if (fidx == -1) { + /* unmap head */ + dma_unmap_single(dp->dev, tx_ring->txbufs[idx].dma_addr, + skb_headlen(skb), DMA_TO_DEVICE); + + done_pkts += tx_ring->txbufs[idx].pkt_cnt; + done_bytes += tx_ring->txbufs[idx].real_len; + } else { + /* unmap fragment */ + frag = &skb_shinfo(skb)->frags[fidx]; + dma_unmap_page(dp->dev, tx_ring->txbufs[idx].dma_addr, + skb_frag_size(frag), DMA_TO_DEVICE); + } + + /* check for last gather fragment */ + if (fidx == nr_frags - 1) + napi_consume_skb(skb, budget); + + tx_ring->txbufs[idx].dma_addr = 0; + tx_ring->txbufs[idx].skb = NULL; + tx_ring->txbufs[idx].fidx = -2; + } + + tx_ring->qcp_rd_p = qcp_rd_p; + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_bytes += done_bytes; + r_vec->tx_pkts += done_pkts; + u64_stats_update_end(&r_vec->tx_sync); + + if (!dp->netdev) + return; + + nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); + netdev_tx_completed_queue(nd_q, done_pkts, done_bytes); + if (nfp_net_tx_ring_should_wake(tx_ring)) { + /* Make sure TX thread will see updated tx_ring->rd_p */ + smp_mb(); + + if (unlikely(netif_tx_queue_stopped(nd_q))) + netif_tx_wake_queue(nd_q); + } + + WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, + "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", + tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); +} + +static bool nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + u32 done_pkts = 0, done_bytes = 0; + bool done_all; + int idx, todo; + u32 qcp_rd_p; + + /* Work out how many descriptors have been transmitted */ + qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q); + + if (qcp_rd_p == tx_ring->qcp_rd_p) + return true; + + todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p); + + done_all = todo <= NFP_NET_XDP_MAX_COMPLETE; + todo = min(todo, NFP_NET_XDP_MAX_COMPLETE); + + tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + todo); + + done_pkts = todo; + while (todo--) { + idx = D_IDX(tx_ring, tx_ring->rd_p); + tx_ring->rd_p++; + + done_bytes += tx_ring->txbufs[idx].real_len; + } + + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_bytes += done_bytes; + r_vec->tx_pkts += done_pkts; + u64_stats_update_end(&r_vec->tx_sync); + + WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt, + "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n", + tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt); + + return done_all; +} + +/** + * nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers + * @dp: NFP Net data path struct + * @tx_ring: TX ring structure + * + * Assumes that the device is stopped, must be idempotent. + */ +static void +nfp_net_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) +{ + const struct skb_frag_struct *frag; + struct netdev_queue *nd_q; + + while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) { + struct nfp_net_tx_buf *tx_buf; + struct sk_buff *skb; + int idx, nr_frags; + + idx = D_IDX(tx_ring, tx_ring->rd_p); + tx_buf = &tx_ring->txbufs[idx]; + + skb = tx_ring->txbufs[idx].skb; + nr_frags = skb_shinfo(skb)->nr_frags; + + if (tx_buf->fidx == -1) { + /* unmap head */ + dma_unmap_single(dp->dev, tx_buf->dma_addr, + skb_headlen(skb), DMA_TO_DEVICE); + } else { + /* unmap fragment */ + frag = &skb_shinfo(skb)->frags[tx_buf->fidx]; + dma_unmap_page(dp->dev, tx_buf->dma_addr, + skb_frag_size(frag), DMA_TO_DEVICE); + } + + /* check for last gather fragment */ + if (tx_buf->fidx == nr_frags - 1) + dev_kfree_skb_any(skb); + + tx_buf->dma_addr = 0; + tx_buf->skb = NULL; + tx_buf->fidx = -2; + + tx_ring->qcp_rd_p++; + tx_ring->rd_p++; + } + + memset(tx_ring->txds, 0, tx_ring->size); + tx_ring->wr_p = 0; + tx_ring->rd_p = 0; + tx_ring->qcp_rd_p = 0; + tx_ring->wr_ptr_add = 0; + + if (tx_ring->is_xdp || !dp->netdev) + return; + + nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx); + netdev_tx_reset_queue(nd_q); +} + +static void nfp_net_tx_timeout(struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + int i; + + for (i = 0; i < nn->dp.netdev->real_num_tx_queues; i++) { + if (!netif_tx_queue_stopped(netdev_get_tx_queue(netdev, i))) + continue; + nn_warn(nn, "TX timeout on ring: %d\n", i); + } + nn_warn(nn, "TX watchdog timeout\n"); +} + +/* Receive processing + */ +static unsigned int +nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp) +{ + unsigned int fl_bufsz; + + fl_bufsz = NFP_NET_RX_BUF_HEADROOM; + fl_bufsz += dp->rx_dma_off; + if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) + fl_bufsz += NFP_NET_MAX_PREPEND; + else + fl_bufsz += dp->rx_offset; + fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu; + + fl_bufsz = SKB_DATA_ALIGN(fl_bufsz); + fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + + return fl_bufsz; +} + +static void +nfp_net_free_frag(void *frag, bool xdp) +{ + if (!xdp) + skb_free_frag(frag); + else + __free_page(virt_to_page(frag)); +} + +/** + * nfp_net_rx_alloc_one() - Allocate and map page frag for RX + * @dp: NFP Net data path struct + * @dma_addr: Pointer to storage for DMA address (output param) + * + * This function will allcate a new page frag, map it for DMA. + * + * Return: allocated page frag or NULL on failure. + */ +static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) +{ + void *frag; + + if (!dp->xdp_prog) { + frag = netdev_alloc_frag(dp->fl_bufsz); + } else { + struct page *page; + + page = alloc_page(GFP_KERNEL); + frag = page ? page_address(page) : NULL; + } + if (!frag) { + nn_dp_warn(dp, "Failed to alloc receive page frag\n"); + return NULL; + } + + *dma_addr = nfp_net_dma_map_rx(dp, frag); + if (dma_mapping_error(dp->dev, *dma_addr)) { + nfp_net_free_frag(frag, dp->xdp_prog); + nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); + return NULL; + } + + return frag; +} + +static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr) +{ + void *frag; + + if (!dp->xdp_prog) { + frag = napi_alloc_frag(dp->fl_bufsz); + if (unlikely(!frag)) + return NULL; + } else { + struct page *page; + + page = dev_alloc_page(); + if (unlikely(!page)) + return NULL; + frag = page_address(page); + } + + *dma_addr = nfp_net_dma_map_rx(dp, frag); + if (dma_mapping_error(dp->dev, *dma_addr)) { + nfp_net_free_frag(frag, dp->xdp_prog); + nn_dp_warn(dp, "Failed to map DMA RX buffer\n"); + return NULL; + } + + return frag; +} + +/** + * nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings + * @dp: NFP Net data path struct + * @rx_ring: RX ring structure + * @frag: page fragment buffer + * @dma_addr: DMA address of skb mapping + */ +static void nfp_net_rx_give_one(const struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring, + void *frag, dma_addr_t dma_addr) +{ + unsigned int wr_idx; + + wr_idx = D_IDX(rx_ring, rx_ring->wr_p); + + nfp_net_dma_sync_dev_rx(dp, dma_addr); + + /* Stash SKB and DMA address away */ + rx_ring->rxbufs[wr_idx].frag = frag; + rx_ring->rxbufs[wr_idx].dma_addr = dma_addr; + + /* Fill freelist descriptor */ + rx_ring->rxds[wr_idx].fld.reserved = 0; + rx_ring->rxds[wr_idx].fld.meta_len_dd = 0; + nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld, + dma_addr + dp->rx_dma_off); + + rx_ring->wr_p++; + if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) { + /* Update write pointer of the freelist queue. Make + * sure all writes are flushed before telling the hardware. + */ + wmb(); + nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH); + } +} + +/** + * nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable + * @rx_ring: RX ring structure + * + * Assumes that the device is stopped, must be idempotent. + */ +static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring) +{ + unsigned int wr_idx, last_idx; + + /* wr_p == rd_p means ring was never fed FL bufs. RX rings are always + * kept at cnt - 1 FL bufs. + */ + if (rx_ring->wr_p == 0 && rx_ring->rd_p == 0) + return; + + /* Move the empty entry to the end of the list */ + wr_idx = D_IDX(rx_ring, rx_ring->wr_p); + last_idx = rx_ring->cnt - 1; + rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr; + rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag; + rx_ring->rxbufs[last_idx].dma_addr = 0; + rx_ring->rxbufs[last_idx].frag = NULL; + + memset(rx_ring->rxds, 0, rx_ring->size); + rx_ring->wr_p = 0; + rx_ring->rd_p = 0; +} + +/** + * nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring + * @dp: NFP Net data path struct + * @rx_ring: RX ring to remove buffers from + * + * Assumes that the device is stopped and buffers are in [0, ring->cnt - 1) + * entries. After device is disabled nfp_net_rx_ring_reset() must be called + * to restore required ring geometry. + */ +static void +nfp_net_rx_ring_bufs_free(struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring) +{ + unsigned int i; + + for (i = 0; i < rx_ring->cnt - 1; i++) { + /* NULL skb can only happen when initial filling of the ring + * fails to allocate enough buffers and calls here to free + * already allocated ones. + */ + if (!rx_ring->rxbufs[i].frag) + continue; + + nfp_net_dma_unmap_rx(dp, rx_ring->rxbufs[i].dma_addr); + nfp_net_free_frag(rx_ring->rxbufs[i].frag, dp->xdp_prog); + rx_ring->rxbufs[i].dma_addr = 0; + rx_ring->rxbufs[i].frag = NULL; + } +} + +/** + * nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW) + * @dp: NFP Net data path struct + * @rx_ring: RX ring to remove buffers from + */ +static int +nfp_net_rx_ring_bufs_alloc(struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring) +{ + struct nfp_net_rx_buf *rxbufs; + unsigned int i; + + rxbufs = rx_ring->rxbufs; + + for (i = 0; i < rx_ring->cnt - 1; i++) { + rxbufs[i].frag = nfp_net_rx_alloc_one(dp, &rxbufs[i].dma_addr); + if (!rxbufs[i].frag) { + nfp_net_rx_ring_bufs_free(dp, rx_ring); + return -ENOMEM; + } + } + + return 0; +} + +/** + * nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW + * @dp: NFP Net data path struct + * @rx_ring: RX ring to fill + */ +static void +nfp_net_rx_ring_fill_freelist(struct nfp_net_dp *dp, + struct nfp_net_rx_ring *rx_ring) +{ + unsigned int i; + + for (i = 0; i < rx_ring->cnt - 1; i++) + nfp_net_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag, + rx_ring->rxbufs[i].dma_addr); +} + +/** + * nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors + * @flags: RX descriptor flags field in CPU byte order + */ +static int nfp_net_rx_csum_has_errors(u16 flags) +{ + u16 csum_all_checked, csum_all_ok; + + csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL; + csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK; + + return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT); +} + +/** + * nfp_net_rx_csum() - set SKB checksum field based on RX descriptor flags + * @dp: NFP Net data path struct + * @r_vec: per-ring structure + * @rxd: Pointer to RX descriptor + * @meta: Parsed metadata prepend + * @skb: Pointer to SKB + */ +static void nfp_net_rx_csum(struct nfp_net_dp *dp, + struct nfp_net_r_vector *r_vec, + struct nfp_net_rx_desc *rxd, + struct nfp_meta_parsed *meta, struct sk_buff *skb) +{ + skb_checksum_none_assert(skb); + + if (!(dp->netdev->features & NETIF_F_RXCSUM)) + return; + + if (meta->csum_type) { + skb->ip_summed = meta->csum_type; + skb->csum = meta->csum; + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_complete++; + u64_stats_update_end(&r_vec->rx_sync); + return; + } + + if (nfp_net_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) { + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_error++; + u64_stats_update_end(&r_vec->rx_sync); + return; + } + + /* Assume that the firmware will never report inner CSUM_OK unless outer + * L4 headers were successfully parsed. FW will always report zero UDP + * checksum as CSUM_OK. + */ + if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK || + rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) { + __skb_incr_checksum_unnecessary(skb); + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_ok++; + u64_stats_update_end(&r_vec->rx_sync); + } + + if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK || + rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) { + __skb_incr_checksum_unnecessary(skb); + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->hw_csum_rx_inner_ok++; + u64_stats_update_end(&r_vec->rx_sync); + } +} + +static void +nfp_net_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta, + unsigned int type, __be32 *hash) +{ + if (!(netdev->features & NETIF_F_RXHASH)) + return; + + switch (type) { + case NFP_NET_RSS_IPV4: + case NFP_NET_RSS_IPV6: + case NFP_NET_RSS_IPV6_EX: + meta->hash_type = PKT_HASH_TYPE_L3; + break; + default: + meta->hash_type = PKT_HASH_TYPE_L4; + break; + } + + meta->hash = get_unaligned_be32(hash); +} + +static void +nfp_net_set_hash_desc(struct net_device *netdev, struct nfp_meta_parsed *meta, + void *data, struct nfp_net_rx_desc *rxd) +{ + struct nfp_net_rx_hash *rx_hash = data; + + if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS)) + return; + + nfp_net_set_hash(netdev, meta, get_unaligned_be32(&rx_hash->hash_type), + &rx_hash->hash); +} + +static void * +nfp_net_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta, + void *data, int meta_len) +{ + u32 meta_info; + + meta_info = get_unaligned_be32(data); + data += 4; + + while (meta_info) { + switch (meta_info & NFP_NET_META_FIELD_MASK) { + case NFP_NET_META_HASH: + meta_info >>= NFP_NET_META_FIELD_SIZE; + nfp_net_set_hash(netdev, meta, + meta_info & NFP_NET_META_FIELD_MASK, + (__be32 *)data); + data += 4; + break; + case NFP_NET_META_MARK: + meta->mark = get_unaligned_be32(data); + data += 4; + break; + case NFP_NET_META_PORTID: + meta->portid = get_unaligned_be32(data); + data += 4; + break; + case NFP_NET_META_CSUM: + meta->csum_type = CHECKSUM_COMPLETE; + meta->csum = + (__force __wsum)__get_unaligned_cpu32(data); + data += 4; + break; + default: + return NULL; + } + + meta_info >>= NFP_NET_META_FIELD_SIZE; + } + + return data; +} + +static void +nfp_net_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec, + struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf, + struct sk_buff *skb) +{ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_drops++; + /* If we have both skb and rxbuf the replacement buffer allocation + * must have failed, count this as an alloc failure. + */ + if (skb && rxbuf) + r_vec->rx_replace_buf_alloc_fail++; + u64_stats_update_end(&r_vec->rx_sync); + + /* skb is build based on the frag, free_skb() would free the frag + * so to be able to reuse it we need an extra ref. + */ + if (skb && rxbuf && skb->head == rxbuf->frag) + page_ref_inc(virt_to_head_page(rxbuf->frag)); + if (rxbuf) + nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr); + if (skb) + dev_kfree_skb_any(skb); +} + +static bool +nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring, + struct nfp_net_tx_ring *tx_ring, + struct nfp_net_rx_buf *rxbuf, unsigned int dma_off, + unsigned int pkt_len, bool *completed) +{ + struct nfp_net_tx_buf *txbuf; + struct nfp_net_tx_desc *txd; + int wr_idx; + + if (unlikely(nfp_net_tx_full(tx_ring, 1))) { + if (!*completed) { + nfp_net_xdp_complete(tx_ring); + *completed = true; + } + + if (unlikely(nfp_net_tx_full(tx_ring, 1))) { + nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, + NULL); + return false; + } + } + + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + + /* Stash the soft descriptor of the head then initialize it */ + txbuf = &tx_ring->txbufs[wr_idx]; + + nfp_net_rx_give_one(dp, rx_ring, txbuf->frag, txbuf->dma_addr); + + txbuf->frag = rxbuf->frag; + txbuf->dma_addr = rxbuf->dma_addr; + txbuf->fidx = -1; + txbuf->pkt_cnt = 1; + txbuf->real_len = pkt_len; + + dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off, + pkt_len, DMA_BIDIRECTIONAL); + + /* Build TX descriptor */ + txd = &tx_ring->txds[wr_idx]; + txd->offset_eop = PCIE_DESC_TX_EOP; + txd->dma_len = cpu_to_le16(pkt_len); + nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off); + txd->data_len = cpu_to_le16(pkt_len); + + txd->flags = 0; + txd->mss = 0; + txd->lso_hdrlen = 0; + + tx_ring->wr_p++; + tx_ring->wr_ptr_add++; + return true; +} + +/** + * nfp_net_rx() - receive up to @budget packets on @rx_ring + * @rx_ring: RX ring to receive from + * @budget: NAPI budget + * + * Note, this function is separated out from the napi poll function to + * more cleanly separate packet receive code from other bookkeeping + * functions performed in the napi poll function. + * + * Return: Number of packets received. + */ +static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget) +{ + struct nfp_net_r_vector *r_vec = rx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + struct nfp_net_tx_ring *tx_ring; + struct bpf_prog *xdp_prog; + bool xdp_tx_cmpl = false; + unsigned int true_bufsz; + struct sk_buff *skb; + int pkts_polled = 0; + struct xdp_buff xdp; + int idx; + + rcu_read_lock(); + xdp_prog = READ_ONCE(dp->xdp_prog); + true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz; + xdp.rxq = &rx_ring->xdp_rxq; + tx_ring = r_vec->xdp_ring; + + while (pkts_polled < budget) { + unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; + struct nfp_net_rx_buf *rxbuf; + struct nfp_net_rx_desc *rxd; + struct nfp_meta_parsed meta; + struct net_device *netdev; + dma_addr_t new_dma_addr; + u32 meta_len_xdp = 0; + void *new_frag; + + idx = D_IDX(rx_ring, rx_ring->rd_p); + + rxd = &rx_ring->rxds[idx]; + if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) + break; + + /* Memory barrier to ensure that we won't do other reads + * before the DD bit. + */ + dma_rmb(); + + memset(&meta, 0, sizeof(meta)); + + rx_ring->rd_p++; + pkts_polled++; + + rxbuf = &rx_ring->rxbufs[idx]; + /* < meta_len > + * <-- [rx_offset] --> + * --------------------------------------------------------- + * | [XX] | metadata | packet | XXXX | + * --------------------------------------------------------- + * <---------------- data_len ---------------> + * + * The rx_offset is fixed for all packets, the meta_len can vary + * on a packet by packet basis. If rx_offset is set to zero + * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the + * buffer and is immediately followed by the packet (no [XX]). + */ + meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; + data_len = le16_to_cpu(rxd->rxd.data_len); + pkt_len = data_len - meta_len; + + pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; + if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) + pkt_off += meta_len; + else + pkt_off += dp->rx_offset; + meta_off = pkt_off - meta_len; + + /* Stats update */ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_pkts++; + r_vec->rx_bytes += pkt_len; + u64_stats_update_end(&r_vec->rx_sync); + + if (unlikely(meta_len > NFP_NET_MAX_PREPEND || + (dp->rx_offset && meta_len > dp->rx_offset))) { + nn_dp_warn(dp, "oversized RX packet metadata %u\n", + meta_len); + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + continue; + } + + nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, + data_len); + + if (!dp->chained_metadata_format) { + nfp_net_set_hash_desc(dp->netdev, &meta, + rxbuf->frag + meta_off, rxd); + } else if (meta_len) { + void *end; + + end = nfp_net_parse_meta(dp->netdev, &meta, + rxbuf->frag + meta_off, + meta_len); + if (unlikely(end != rxbuf->frag + pkt_off)) { + nn_dp_warn(dp, "invalid RX packet metadata\n"); + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, + NULL); + continue; + } + } + + if (xdp_prog && !meta.portid) { + void *orig_data = rxbuf->frag + pkt_off; + unsigned int dma_off; + int act; + + xdp.data_hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM; + xdp.data = orig_data; + xdp.data_meta = orig_data; + xdp.data_end = orig_data + pkt_len; + + act = bpf_prog_run_xdp(xdp_prog, &xdp); + + pkt_len = xdp.data_end - xdp.data; + pkt_off += xdp.data - orig_data; + + switch (act) { + case XDP_PASS: + meta_len_xdp = xdp.data - xdp.data_meta; + break; + case XDP_TX: + dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM; + if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring, + tx_ring, rxbuf, + dma_off, + pkt_len, + &xdp_tx_cmpl))) + trace_xdp_exception(dp->netdev, + xdp_prog, act); + continue; + default: + bpf_warn_invalid_xdp_action(act); + /* fall through */ + case XDP_ABORTED: + trace_xdp_exception(dp->netdev, xdp_prog, act); + /* fall through */ + case XDP_DROP: + nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, + rxbuf->dma_addr); + continue; + } + } + + if (likely(!meta.portid)) { + netdev = dp->netdev; + } else if (meta.portid == NFP_META_PORT_ID_CTRL) { + struct nfp_net *nn = netdev_priv(dp->netdev); + + nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off, + pkt_len); + nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, + rxbuf->dma_addr); + continue; + } else { + struct nfp_net *nn; + + nn = netdev_priv(dp->netdev); + netdev = nfp_app_repr_get(nn->app, meta.portid); + if (unlikely(!netdev)) { + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, + NULL); + continue; + } + nfp_repr_inc_rx_stats(netdev, pkt_len); + } + + skb = build_skb(rxbuf->frag, true_bufsz); + if (unlikely(!skb)) { + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + continue; + } + new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr); + if (unlikely(!new_frag)) { + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); + continue; + } + + nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); + + nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); + + skb_reserve(skb, pkt_off); + skb_put(skb, pkt_len); + + skb->mark = meta.mark; + skb_set_hash(skb, meta.hash, meta.hash_type); + + skb_record_rx_queue(skb, rx_ring->idx); + skb->protocol = eth_type_trans(skb, netdev); + + nfp_net_rx_csum(dp, r_vec, rxd, &meta, skb); + + if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) + __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), + le16_to_cpu(rxd->rxd.vlan)); + if (meta_len_xdp) + skb_metadata_set(skb, meta_len_xdp); + + napi_gro_receive(&rx_ring->r_vec->napi, skb); + } + + if (xdp_prog) { + if (tx_ring->wr_ptr_add) + nfp_net_tx_xmit_more_flush(tx_ring); + else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) && + !xdp_tx_cmpl) + if (!nfp_net_xdp_complete(tx_ring)) + pkts_polled = budget; + } + rcu_read_unlock(); + + return pkts_polled; +} + +/** + * nfp_net_poll() - napi poll function + * @napi: NAPI structure + * @budget: NAPI budget + * + * Return: number of packets polled. + */ +static int nfp_net_poll(struct napi_struct *napi, int budget) +{ + struct nfp_net_r_vector *r_vec = + container_of(napi, struct nfp_net_r_vector, napi); + unsigned int pkts_polled = 0; + + if (r_vec->tx_ring) + nfp_net_tx_complete(r_vec->tx_ring, budget); + if (r_vec->rx_ring) + pkts_polled = nfp_net_rx(r_vec->rx_ring, budget); + + if (pkts_polled < budget) + if (napi_complete_done(napi, pkts_polled)) + nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); + + return pkts_polled; +} + +/* Control device data path + */ + +static bool +nfp_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, + struct sk_buff *skb, bool old) +{ + unsigned int real_len = skb->len, meta_len = 0; + struct nfp_net_tx_ring *tx_ring; + struct nfp_net_tx_buf *txbuf; + struct nfp_net_tx_desc *txd; + struct nfp_net_dp *dp; + dma_addr_t dma_addr; + int wr_idx; + + dp = &r_vec->nfp_net->dp; + tx_ring = r_vec->tx_ring; + + if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) { + nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n"); + goto err_free; + } + + if (unlikely(nfp_net_tx_full(tx_ring, 1))) { + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_busy++; + u64_stats_update_end(&r_vec->tx_sync); + if (!old) + __skb_queue_tail(&r_vec->queue, skb); + else + __skb_queue_head(&r_vec->queue, skb); + return true; + } + + if (nfp_app_ctrl_has_meta(nn->app)) { + if (unlikely(skb_headroom(skb) < 8)) { + nn_dp_warn(dp, "CTRL TX on skb without headroom\n"); + goto err_free; + } + meta_len = 8; + put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4)); + put_unaligned_be32(NFP_NET_META_PORTID, skb_push(skb, 4)); + } + + /* Start with the head skbuf */ + dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb), + DMA_TO_DEVICE); + if (dma_mapping_error(dp->dev, dma_addr)) + goto err_dma_warn; + + wr_idx = D_IDX(tx_ring, tx_ring->wr_p); + + /* Stash the soft descriptor of the head then initialize it */ + txbuf = &tx_ring->txbufs[wr_idx]; + txbuf->skb = skb; + txbuf->dma_addr = dma_addr; + txbuf->fidx = -1; + txbuf->pkt_cnt = 1; + txbuf->real_len = real_len; + + /* Build TX descriptor */ + txd = &tx_ring->txds[wr_idx]; + txd->offset_eop = meta_len | PCIE_DESC_TX_EOP; + txd->dma_len = cpu_to_le16(skb_headlen(skb)); + nfp_desc_set_dma_addr(txd, dma_addr); + txd->data_len = cpu_to_le16(skb->len); + + txd->flags = 0; + txd->mss = 0; + txd->lso_hdrlen = 0; + + tx_ring->wr_p++; + tx_ring->wr_ptr_add++; + nfp_net_tx_xmit_more_flush(tx_ring); + + return false; + +err_dma_warn: + nn_dp_warn(dp, "Failed to DMA map TX CTRL buffer\n"); +err_free: + u64_stats_update_begin(&r_vec->tx_sync); + r_vec->tx_errors++; + u64_stats_update_end(&r_vec->tx_sync); + dev_kfree_skb_any(skb); + return false; +} + +bool __nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb) +{ + struct nfp_net_r_vector *r_vec = &nn->r_vecs[0]; + + return nfp_ctrl_tx_one(nn, r_vec, skb, false); +} + +bool nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb) +{ + struct nfp_net_r_vector *r_vec = &nn->r_vecs[0]; + bool ret; + + spin_lock_bh(&r_vec->lock); + ret = nfp_ctrl_tx_one(nn, r_vec, skb, false); + spin_unlock_bh(&r_vec->lock); + + return ret; +} + +static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec) +{ + struct sk_buff *skb; + + while ((skb = __skb_dequeue(&r_vec->queue))) + if (nfp_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true)) + return; +} + +static bool +nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len) +{ + u32 meta_type, meta_tag; + + if (!nfp_app_ctrl_has_meta(nn->app)) + return !meta_len; + + if (meta_len != 8) + return false; + + meta_type = get_unaligned_be32(data); + meta_tag = get_unaligned_be32(data + 4); + + return (meta_type == NFP_NET_META_PORTID && + meta_tag == NFP_META_PORT_ID_CTRL); +} + +static bool +nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp, + struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring) +{ + unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off; + struct nfp_net_rx_buf *rxbuf; + struct nfp_net_rx_desc *rxd; + dma_addr_t new_dma_addr; + struct sk_buff *skb; + void *new_frag; + int idx; + + idx = D_IDX(rx_ring, rx_ring->rd_p); + + rxd = &rx_ring->rxds[idx]; + if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD)) + return false; + + /* Memory barrier to ensure that we won't do other reads + * before the DD bit. + */ + dma_rmb(); + + rx_ring->rd_p++; + + rxbuf = &rx_ring->rxbufs[idx]; + meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK; + data_len = le16_to_cpu(rxd->rxd.data_len); + pkt_len = data_len - meta_len; + + pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off; + if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) + pkt_off += meta_len; + else + pkt_off += dp->rx_offset; + meta_off = pkt_off - meta_len; + + /* Stats update */ + u64_stats_update_begin(&r_vec->rx_sync); + r_vec->rx_pkts++; + r_vec->rx_bytes += pkt_len; + u64_stats_update_end(&r_vec->rx_sync); + + nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len); + + if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) { + nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n", + meta_len); + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + return true; + } + + skb = build_skb(rxbuf->frag, dp->fl_bufsz); + if (unlikely(!skb)) { + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL); + return true; + } + new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr); + if (unlikely(!new_frag)) { + nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb); + return true; + } + + nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr); + + nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr); + + skb_reserve(skb, pkt_off); + skb_put(skb, pkt_len); + + nfp_app_ctrl_rx(nn->app, skb); + + return true; +} + +static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec) +{ + struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring; + struct nfp_net *nn = r_vec->nfp_net; + struct nfp_net_dp *dp = &nn->dp; + unsigned int budget = 512; + + while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--) + continue; + + return budget; +} + +static void nfp_ctrl_poll(unsigned long arg) +{ + struct nfp_net_r_vector *r_vec = (void *)arg; + + spin_lock_bh(&r_vec->lock); + nfp_net_tx_complete(r_vec->tx_ring, 0); + __nfp_ctrl_tx_queued(r_vec); + spin_unlock_bh(&r_vec->lock); + + if (nfp_ctrl_rx(r_vec)) { + nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); + } else { + tasklet_schedule(&r_vec->tasklet); + nn_dp_warn(&r_vec->nfp_net->dp, + "control message budget exceeded!\n"); + } +} + +/* Setup and Configuration + */ + +/** + * nfp_net_vecs_init() - Assign IRQs and setup rvecs. + * @nn: NFP Network structure + */ +static void nfp_net_vecs_init(struct nfp_net *nn) +{ + struct nfp_net_r_vector *r_vec; + int r; + + nn->lsc_handler = nfp_net_irq_lsc; + nn->exn_handler = nfp_net_irq_exn; + + for (r = 0; r < nn->max_r_vecs; r++) { + struct msix_entry *entry; + + entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r]; + + r_vec = &nn->r_vecs[r]; + r_vec->nfp_net = nn; + r_vec->irq_entry = entry->entry; + r_vec->irq_vector = entry->vector; + + if (nn->dp.netdev) { + r_vec->handler = nfp_net_irq_rxtx; + } else { + r_vec->handler = nfp_ctrl_irq_rxtx; + + __skb_queue_head_init(&r_vec->queue); + spin_lock_init(&r_vec->lock); + tasklet_init(&r_vec->tasklet, nfp_ctrl_poll, + (unsigned long)r_vec); + tasklet_disable(&r_vec->tasklet); + } + + cpumask_set_cpu(r, &r_vec->affinity_mask); + } +} + +/** + * nfp_net_tx_ring_free() - Free resources allocated to a TX ring + * @tx_ring: TX ring to free + */ +static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + + kvfree(tx_ring->txbufs); + + if (tx_ring->txds) + dma_free_coherent(dp->dev, tx_ring->size, + tx_ring->txds, tx_ring->dma); + + tx_ring->cnt = 0; + tx_ring->txbufs = NULL; + tx_ring->txds = NULL; + tx_ring->dma = 0; + tx_ring->size = 0; +} + +/** + * nfp_net_tx_ring_alloc() - Allocate resource for a TX ring + * @dp: NFP Net data path struct + * @tx_ring: TX Ring structure to allocate + * + * Return: 0 on success, negative errno otherwise. + */ +static int +nfp_net_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring) +{ + struct nfp_net_r_vector *r_vec = tx_ring->r_vec; + + tx_ring->cnt = dp->txd_cnt; + + tx_ring->size = array_size(tx_ring->cnt, sizeof(*tx_ring->txds)); + tx_ring->txds = dma_zalloc_coherent(dp->dev, tx_ring->size, + &tx_ring->dma, + GFP_KERNEL | __GFP_NOWARN); + if (!tx_ring->txds) { + netdev_warn(dp->netdev, "failed to allocate TX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n", + tx_ring->cnt); + goto err_alloc; + } + + tx_ring->txbufs = kvcalloc(tx_ring->cnt, sizeof(*tx_ring->txbufs), + GFP_KERNEL); + if (!tx_ring->txbufs) + goto err_alloc; + + if (!tx_ring->is_xdp && dp->netdev) + netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask, + tx_ring->idx); + + return 0; + +err_alloc: + nfp_net_tx_ring_free(tx_ring); + return -ENOMEM; +} + +static void +nfp_net_tx_ring_bufs_free(struct nfp_net_dp *dp, + struct nfp_net_tx_ring *tx_ring) +{ + unsigned int i; + + if (!tx_ring->is_xdp) + return; + + for (i = 0; i < tx_ring->cnt; i++) { + if (!tx_ring->txbufs[i].frag) + return; + + nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[i].dma_addr); + __free_page(virt_to_page(tx_ring->txbufs[i].frag)); + } +} + +static int +nfp_net_tx_ring_bufs_alloc(struct nfp_net_dp *dp, + struct nfp_net_tx_ring *tx_ring) +{ + struct nfp_net_tx_buf *txbufs = tx_ring->txbufs; + unsigned int i; + + if (!tx_ring->is_xdp) + return 0; + + for (i = 0; i < tx_ring->cnt; i++) { + txbufs[i].frag = nfp_net_rx_alloc_one(dp, &txbufs[i].dma_addr); + if (!txbufs[i].frag) { + nfp_net_tx_ring_bufs_free(dp, tx_ring); + return -ENOMEM; + } + } + + return 0; +} + +static int nfp_net_tx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp) +{ + unsigned int r; + + dp->tx_rings = kcalloc(dp->num_tx_rings, sizeof(*dp->tx_rings), + GFP_KERNEL); + if (!dp->tx_rings) + return -ENOMEM; + + for (r = 0; r < dp->num_tx_rings; r++) { + int bias = 0; + + if (r >= dp->num_stack_tx_rings) + bias = dp->num_stack_tx_rings; + + nfp_net_tx_ring_init(&dp->tx_rings[r], &nn->r_vecs[r - bias], + r, bias); + + if (nfp_net_tx_ring_alloc(dp, &dp->tx_rings[r])) + goto err_free_prev; + + if (nfp_net_tx_ring_bufs_alloc(dp, &dp->tx_rings[r])) + goto err_free_ring; + } + + return 0; + +err_free_prev: + while (r--) { + nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]); +err_free_ring: + nfp_net_tx_ring_free(&dp->tx_rings[r]); + } + kfree(dp->tx_rings); + return -ENOMEM; +} + +static void nfp_net_tx_rings_free(struct nfp_net_dp *dp) +{ + unsigned int r; + + for (r = 0; r < dp->num_tx_rings; r++) { + nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]); + nfp_net_tx_ring_free(&dp->tx_rings[r]); + } + + kfree(dp->tx_rings); +} + +/** + * nfp_net_rx_ring_free() - Free resources allocated to a RX ring + * @rx_ring: RX ring to free + */ +static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring) +{ + struct nfp_net_r_vector *r_vec = rx_ring->r_vec; + struct nfp_net_dp *dp = &r_vec->nfp_net->dp; + + if (dp->netdev) + xdp_rxq_info_unreg(&rx_ring->xdp_rxq); + kvfree(rx_ring->rxbufs); + + if (rx_ring->rxds) + dma_free_coherent(dp->dev, rx_ring->size, + rx_ring->rxds, rx_ring->dma); + + rx_ring->cnt = 0; + rx_ring->rxbufs = NULL; + rx_ring->rxds = NULL; + rx_ring->dma = 0; + rx_ring->size = 0; +} + +/** + * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring + * @dp: NFP Net data path struct + * @rx_ring: RX ring to allocate + * + * Return: 0 on success, negative errno otherwise. + */ +static int +nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring) +{ + int err; + + if (dp->netdev) { + err = xdp_rxq_info_reg(&rx_ring->xdp_rxq, dp->netdev, + rx_ring->idx); + if (err < 0) + return err; + } + + rx_ring->cnt = dp->rxd_cnt; + rx_ring->size = array_size(rx_ring->cnt, sizeof(*rx_ring->rxds)); + rx_ring->rxds = dma_zalloc_coherent(dp->dev, rx_ring->size, + &rx_ring->dma, + GFP_KERNEL | __GFP_NOWARN); + if (!rx_ring->rxds) { + netdev_warn(dp->netdev, "failed to allocate RX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n", + rx_ring->cnt); + goto err_alloc; + } + + rx_ring->rxbufs = kvcalloc(rx_ring->cnt, sizeof(*rx_ring->rxbufs), + GFP_KERNEL); + if (!rx_ring->rxbufs) + goto err_alloc; + + return 0; + +err_alloc: + nfp_net_rx_ring_free(rx_ring); + return -ENOMEM; +} + +static int nfp_net_rx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp) +{ + unsigned int r; + + dp->rx_rings = kcalloc(dp->num_rx_rings, sizeof(*dp->rx_rings), + GFP_KERNEL); + if (!dp->rx_rings) + return -ENOMEM; + + for (r = 0; r < dp->num_rx_rings; r++) { + nfp_net_rx_ring_init(&dp->rx_rings[r], &nn->r_vecs[r], r); + + if (nfp_net_rx_ring_alloc(dp, &dp->rx_rings[r])) + goto err_free_prev; + + if (nfp_net_rx_ring_bufs_alloc(dp, &dp->rx_rings[r])) + goto err_free_ring; + } + + return 0; + +err_free_prev: + while (r--) { + nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]); +err_free_ring: + nfp_net_rx_ring_free(&dp->rx_rings[r]); + } + kfree(dp->rx_rings); + return -ENOMEM; +} + +static void nfp_net_rx_rings_free(struct nfp_net_dp *dp) +{ + unsigned int r; + + for (r = 0; r < dp->num_rx_rings; r++) { + nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]); + nfp_net_rx_ring_free(&dp->rx_rings[r]); + } + + kfree(dp->rx_rings); +} + +static void +nfp_net_vector_assign_rings(struct nfp_net_dp *dp, + struct nfp_net_r_vector *r_vec, int idx) +{ + r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL; + r_vec->tx_ring = + idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL; + + r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ? + &dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL; +} + +static int +nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, + int idx) +{ + int err; + + /* Setup NAPI */ + if (nn->dp.netdev) + netif_napi_add(nn->dp.netdev, &r_vec->napi, + nfp_net_poll, NAPI_POLL_WEIGHT); + else + tasklet_enable(&r_vec->tasklet); + + snprintf(r_vec->name, sizeof(r_vec->name), + "%s-rxtx-%d", nfp_net_name(nn), idx); + err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name, + r_vec); + if (err) { + if (nn->dp.netdev) + netif_napi_del(&r_vec->napi); + else + tasklet_disable(&r_vec->tasklet); + + nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector); + return err; + } + disable_irq(r_vec->irq_vector); + + irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask); + + nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector, + r_vec->irq_entry); + + return 0; +} + +static void +nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec) +{ + irq_set_affinity_hint(r_vec->irq_vector, NULL); + if (nn->dp.netdev) + netif_napi_del(&r_vec->napi); + else + tasklet_disable(&r_vec->tasklet); + + free_irq(r_vec->irq_vector, r_vec); +} + +/** + * nfp_net_rss_write_itbl() - Write RSS indirection table to device + * @nn: NFP Net device to reconfigure + */ +void nfp_net_rss_write_itbl(struct nfp_net *nn) +{ + int i; + + for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4) + nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i, + get_unaligned_le32(nn->rss_itbl + i)); +} + +/** + * nfp_net_rss_write_key() - Write RSS hash key to device + * @nn: NFP Net device to reconfigure + */ +void nfp_net_rss_write_key(struct nfp_net *nn) +{ + int i; + + for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4) + nn_writel(nn, NFP_NET_CFG_RSS_KEY + i, + get_unaligned_le32(nn->rss_key + i)); +} + +/** + * nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW + * @nn: NFP Net device to reconfigure + */ +void nfp_net_coalesce_write_cfg(struct nfp_net *nn) +{ + u8 i; + u32 factor; + u32 value; + + /* Compute factor used to convert coalesce '_usecs' parameters to + * ME timestamp ticks. There are 16 ME clock cycles for each timestamp + * count. + */ + factor = nn->tlv_caps.me_freq_mhz / 16; + + /* copy RX interrupt coalesce parameters */ + value = (nn->rx_coalesce_max_frames << 16) | + (factor * nn->rx_coalesce_usecs); + for (i = 0; i < nn->dp.num_rx_rings; i++) + nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value); + + /* copy TX interrupt coalesce parameters */ + value = (nn->tx_coalesce_max_frames << 16) | + (factor * nn->tx_coalesce_usecs); + for (i = 0; i < nn->dp.num_tx_rings; i++) + nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value); +} + +/** + * nfp_net_write_mac_addr() - Write mac address to the device control BAR + * @nn: NFP Net device to reconfigure + * @addr: MAC address to write + * + * Writes the MAC address from the netdev to the device control BAR. Does not + * perform the required reconfig. We do a bit of byte swapping dance because + * firmware is LE. + */ +static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *addr) +{ + nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(addr)); + nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(addr + 4)); +} + +static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx) +{ + nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0); + nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0); + nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0); + + nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0); + nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0); + nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0); +} + +/** + * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP + * @nn: NFP Net device to reconfigure + * + * Warning: must be fully idempotent. + */ +static void nfp_net_clear_config_and_disable(struct nfp_net *nn) +{ + u32 new_ctrl, update; + unsigned int r; + int err; + + new_ctrl = nn->dp.ctrl; + new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE; + update = NFP_NET_CFG_UPDATE_GEN; + update |= NFP_NET_CFG_UPDATE_MSIX; + update |= NFP_NET_CFG_UPDATE_RING; + + if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG) + new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG; + + nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0); + nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0); + + nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); + err = nfp_net_reconfig(nn, update); + if (err) + nn_err(nn, "Could not disable device: %d\n", err); + + for (r = 0; r < nn->dp.num_rx_rings; r++) + nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]); + for (r = 0; r < nn->dp.num_tx_rings; r++) + nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]); + for (r = 0; r < nn->dp.num_r_vecs; r++) + nfp_net_vec_clear_ring_data(nn, r); + + nn->dp.ctrl = new_ctrl; +} + +static void +nfp_net_rx_ring_hw_cfg_write(struct nfp_net *nn, + struct nfp_net_rx_ring *rx_ring, unsigned int idx) +{ + /* Write the DMA address, size and MSI-X info to the device */ + nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), rx_ring->dma); + nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(rx_ring->cnt)); + nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), rx_ring->r_vec->irq_entry); +} + +static void +nfp_net_tx_ring_hw_cfg_write(struct nfp_net *nn, + struct nfp_net_tx_ring *tx_ring, unsigned int idx) +{ + nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), tx_ring->dma); + nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(tx_ring->cnt)); + nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), tx_ring->r_vec->irq_entry); +} + +/** + * nfp_net_set_config_and_enable() - Write control BAR and enable NFP + * @nn: NFP Net device to reconfigure + */ +static int nfp_net_set_config_and_enable(struct nfp_net *nn) +{ + u32 bufsz, new_ctrl, update = 0; + unsigned int r; + int err; + + new_ctrl = nn->dp.ctrl; + + if (nn->dp.ctrl & NFP_NET_CFG_CTRL_RSS_ANY) { + nfp_net_rss_write_key(nn); + nfp_net_rss_write_itbl(nn); + nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg); + update |= NFP_NET_CFG_UPDATE_RSS; + } + + if (nn->dp.ctrl & NFP_NET_CFG_CTRL_IRQMOD) { + nfp_net_coalesce_write_cfg(nn); + update |= NFP_NET_CFG_UPDATE_IRQMOD; + } + + for (r = 0; r < nn->dp.num_tx_rings; r++) + nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r); + for (r = 0; r < nn->dp.num_rx_rings; r++) + nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r); + + nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->dp.num_tx_rings == 64 ? + 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_tx_rings) - 1); + + nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->dp.num_rx_rings == 64 ? + 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_rx_rings) - 1); + + if (nn->dp.netdev) + nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr); + + nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.mtu); + + bufsz = nn->dp.fl_bufsz - nn->dp.rx_dma_off - NFP_NET_RX_BUF_NON_DATA; + nn_writel(nn, NFP_NET_CFG_FLBUFSZ, bufsz); + + /* Enable device */ + new_ctrl |= NFP_NET_CFG_CTRL_ENABLE; + update |= NFP_NET_CFG_UPDATE_GEN; + update |= NFP_NET_CFG_UPDATE_MSIX; + update |= NFP_NET_CFG_UPDATE_RING; + if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG) + new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG; + + nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); + err = nfp_net_reconfig(nn, update); + if (err) { + nfp_net_clear_config_and_disable(nn); + return err; + } + + nn->dp.ctrl = new_ctrl; + + for (r = 0; r < nn->dp.num_rx_rings; r++) + nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]); + + /* Since reconfiguration requests while NFP is down are ignored we + * have to wipe the entire VXLAN configuration and reinitialize it. + */ + if (nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN) { + memset(&nn->vxlan_ports, 0, sizeof(nn->vxlan_ports)); + memset(&nn->vxlan_usecnt, 0, sizeof(nn->vxlan_usecnt)); + udp_tunnel_get_rx_info(nn->dp.netdev); + } + + return 0; +} + +/** + * nfp_net_close_stack() - Quiesce the stack (part of close) + * @nn: NFP Net device to reconfigure + */ +static void nfp_net_close_stack(struct nfp_net *nn) +{ + unsigned int r; + + disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); + netif_carrier_off(nn->dp.netdev); + nn->link_up = false; + + for (r = 0; r < nn->dp.num_r_vecs; r++) { + disable_irq(nn->r_vecs[r].irq_vector); + napi_disable(&nn->r_vecs[r].napi); + } + + netif_tx_disable(nn->dp.netdev); +} + +/** + * nfp_net_close_free_all() - Free all runtime resources + * @nn: NFP Net device to reconfigure + */ +static void nfp_net_close_free_all(struct nfp_net *nn) +{ + unsigned int r; + + nfp_net_tx_rings_free(&nn->dp); + nfp_net_rx_rings_free(&nn->dp); + + for (r = 0; r < nn->dp.num_r_vecs; r++) + nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); + + nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX); + nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX); +} + +/** + * nfp_net_netdev_close() - Called when the device is downed + * @netdev: netdev structure + */ +static int nfp_net_netdev_close(struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + + /* Step 1: Disable RX and TX rings from the Linux kernel perspective + */ + nfp_net_close_stack(nn); + + /* Step 2: Tell NFP + */ + nfp_net_clear_config_and_disable(nn); + nfp_port_configure(netdev, false); + + /* Step 3: Free resources + */ + nfp_net_close_free_all(nn); + + nn_dbg(nn, "%s down", netdev->name); + return 0; +} + +void nfp_ctrl_close(struct nfp_net *nn) +{ + int r; + + rtnl_lock(); + + for (r = 0; r < nn->dp.num_r_vecs; r++) { + disable_irq(nn->r_vecs[r].irq_vector); + tasklet_disable(&nn->r_vecs[r].tasklet); + } + + nfp_net_clear_config_and_disable(nn); + + nfp_net_close_free_all(nn); + + rtnl_unlock(); +} + +/** + * nfp_net_open_stack() - Start the device from stack's perspective + * @nn: NFP Net device to reconfigure + */ +static void nfp_net_open_stack(struct nfp_net *nn) +{ + unsigned int r; + + for (r = 0; r < nn->dp.num_r_vecs; r++) { + napi_enable(&nn->r_vecs[r].napi); + enable_irq(nn->r_vecs[r].irq_vector); + } + + netif_tx_wake_all_queues(nn->dp.netdev); + + enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); + nfp_net_read_link_status(nn); +} + +static int nfp_net_open_alloc_all(struct nfp_net *nn) +{ + int err, r; + + err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn", + nn->exn_name, sizeof(nn->exn_name), + NFP_NET_IRQ_EXN_IDX, nn->exn_handler); + if (err) + return err; + err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc", + nn->lsc_name, sizeof(nn->lsc_name), + NFP_NET_IRQ_LSC_IDX, nn->lsc_handler); + if (err) + goto err_free_exn; + disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); + + for (r = 0; r < nn->dp.num_r_vecs; r++) { + err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); + if (err) + goto err_cleanup_vec_p; + } + + err = nfp_net_rx_rings_prepare(nn, &nn->dp); + if (err) + goto err_cleanup_vec; + + err = nfp_net_tx_rings_prepare(nn, &nn->dp); + if (err) + goto err_free_rx_rings; + + for (r = 0; r < nn->max_r_vecs; r++) + nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r); + + return 0; + +err_free_rx_rings: + nfp_net_rx_rings_free(&nn->dp); +err_cleanup_vec: + r = nn->dp.num_r_vecs; +err_cleanup_vec_p: + while (r--) + nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); + nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX); +err_free_exn: + nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX); + return err; +} + +static int nfp_net_netdev_open(struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + int err; + + /* Step 1: Allocate resources for rings and the like + * - Request interrupts + * - Allocate RX and TX ring resources + * - Setup initial RSS table + */ + err = nfp_net_open_alloc_all(nn); + if (err) + return err; + + err = netif_set_real_num_tx_queues(netdev, nn->dp.num_stack_tx_rings); + if (err) + goto err_free_all; + + err = netif_set_real_num_rx_queues(netdev, nn->dp.num_rx_rings); + if (err) + goto err_free_all; + + /* Step 2: Configure the NFP + * - Ifup the physical interface if it exists + * - Enable rings from 0 to tx_rings/rx_rings - 1. + * - Write MAC address (in case it changed) + * - Set the MTU + * - Set the Freelist buffer size + * - Enable the FW + */ + err = nfp_port_configure(netdev, true); + if (err) + goto err_free_all; + + err = nfp_net_set_config_and_enable(nn); + if (err) + goto err_port_disable; + + /* Step 3: Enable for kernel + * - put some freelist descriptors on each RX ring + * - enable NAPI on each ring + * - enable all TX queues + * - set link state + */ + nfp_net_open_stack(nn); + + return 0; + +err_port_disable: + nfp_port_configure(netdev, false); +err_free_all: + nfp_net_close_free_all(nn); + return err; +} + +int nfp_ctrl_open(struct nfp_net *nn) +{ + int err, r; + + /* ring dumping depends on vNICs being opened/closed under rtnl */ + rtnl_lock(); + + err = nfp_net_open_alloc_all(nn); + if (err) + goto err_unlock; + + err = nfp_net_set_config_and_enable(nn); + if (err) + goto err_free_all; + + for (r = 0; r < nn->dp.num_r_vecs; r++) + enable_irq(nn->r_vecs[r].irq_vector); + + rtnl_unlock(); + + return 0; + +err_free_all: + nfp_net_close_free_all(nn); +err_unlock: + rtnl_unlock(); + return err; +} + +static void nfp_net_set_rx_mode(struct net_device *netdev) +{ + struct nfp_net *nn = netdev_priv(netdev); + u32 new_ctrl; + + new_ctrl = nn->dp.ctrl; + + if (!netdev_mc_empty(netdev) || netdev->flags & IFF_ALLMULTI) + new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_L2MC; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_L2MC; + + if (netdev->flags & IFF_PROMISC) { + if (nn->cap & NFP_NET_CFG_CTRL_PROMISC) + new_ctrl |= NFP_NET_CFG_CTRL_PROMISC; + else + nn_warn(nn, "FW does not support promiscuous mode\n"); + } else { + new_ctrl &= ~NFP_NET_CFG_CTRL_PROMISC; + } + + if (new_ctrl == nn->dp.ctrl) + return; + + nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); + nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN); + + nn->dp.ctrl = new_ctrl; +} + +static void nfp_net_rss_init_itbl(struct nfp_net *nn) +{ + int i; + + for (i = 0; i < sizeof(nn->rss_itbl); i++) + nn->rss_itbl[i] = + ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings); +} + +static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp) +{ + struct nfp_net_dp new_dp = *dp; + + *dp = nn->dp; + nn->dp = new_dp; + + nn->dp.netdev->mtu = new_dp.mtu; + + if (!netif_is_rxfh_configured(nn->dp.netdev)) + nfp_net_rss_init_itbl(nn); +} + +static int nfp_net_dp_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp) +{ + unsigned int r; + int err; + + nfp_net_dp_swap(nn, dp); + + for (r = 0; r < nn->max_r_vecs; r++) + nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r); + + err = netif_set_real_num_rx_queues(nn->dp.netdev, nn->dp.num_rx_rings); + if (err) + return err; + + if (nn->dp.netdev->real_num_tx_queues != nn->dp.num_stack_tx_rings) { + err = netif_set_real_num_tx_queues(nn->dp.netdev, + nn->dp.num_stack_tx_rings); + if (err) + return err; + } + + return nfp_net_set_config_and_enable(nn); +} + +struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn) +{ + struct nfp_net_dp *new; + + new = kmalloc(sizeof(*new), GFP_KERNEL); + if (!new) + return NULL; + + *new = nn->dp; + + /* Clear things which need to be recomputed */ + new->fl_bufsz = 0; + new->tx_rings = NULL; + new->rx_rings = NULL; + new->num_r_vecs = 0; + new->num_stack_tx_rings = 0; + + return new; +} + +static int +nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp, + struct netlink_ext_ack *extack) +{ + /* XDP-enabled tests */ + if (!dp->xdp_prog) + return 0; + if (dp->fl_bufsz > PAGE_SIZE) { + NL_SET_ERR_MSG_MOD(extack, "MTU too large w/ XDP enabled"); + return -EINVAL; + } + if (dp->num_tx_rings > nn->max_tx_rings) { + NL_SET_ERR_MSG_MOD(extack, "Insufficient number of TX rings w/ XDP enabled"); + return -EINVAL; + } + + return 0; +} + +int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp, + struct netlink_ext_ack *extack) +{ + int r, err; + + dp->fl_bufsz = nfp_net_calc_fl_bufsz(dp); + + dp->num_stack_tx_rings = dp->num_tx_rings; + if (dp->xdp_prog) + dp->num_stack_tx_rings -= dp->num_rx_rings; + + dp->num_r_vecs = max(dp->num_rx_rings, dp->num_stack_tx_rings); + + err = nfp_net_check_config(nn, dp, extack); + if (err) + goto exit_free_dp; + + if (!netif_running(dp->netdev)) { + nfp_net_dp_swap(nn, dp); + err = 0; + goto exit_free_dp; + } + + /* Prepare new rings */ + for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) { + err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); + if (err) { + dp->num_r_vecs = r; + goto err_cleanup_vecs; + } + } + + err = nfp_net_rx_rings_prepare(nn, dp); + if (err) + goto err_cleanup_vecs; + + err = nfp_net_tx_rings_prepare(nn, dp); + if (err) + goto err_free_rx; + + /* Stop device, swap in new rings, try to start the firmware */ + nfp_net_close_stack(nn); + nfp_net_clear_config_and_disable(nn); + + err = nfp_net_dp_swap_enable(nn, dp); + if (err) { + int err2; + + nfp_net_clear_config_and_disable(nn); + + /* Try with old configuration and old rings */ + err2 = nfp_net_dp_swap_enable(nn, dp); + if (err2) + nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n", + err, err2); + } + for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--) + nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); + + nfp_net_rx_rings_free(dp); + nfp_net_tx_rings_free(dp); + + nfp_net_open_stack(nn); +exit_free_dp: + kfree(dp); + + return err; + +err_free_rx: + nfp_net_rx_rings_free(dp); +err_cleanup_vecs: + for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--) + nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); + kfree(dp); + return err; +} + +static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu) +{ + struct nfp_net *nn = netdev_priv(netdev); + struct nfp_net_dp *dp; + int err; + + err = nfp_app_check_mtu(nn->app, netdev, new_mtu); + if (err) + return err; + + dp = nfp_net_clone_dp(nn); + if (!dp) + return -ENOMEM; + + dp->mtu = new_mtu; + + return nfp_net_ring_reconfig(nn, dp, NULL); +} + +static int +nfp_net_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid) +{ + struct nfp_net *nn = netdev_priv(netdev); + + /* Priority tagged packets with vlan id 0 are processed by the + * NFP as untagged packets + */ + if (!vid) + return 0; + + nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid); + nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO, + ETH_P_8021Q); + + return nfp_net_reconfig_mbox(nn, NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_ADD); +} + +static int +nfp_net_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid) +{ + struct nfp_net *nn = netdev_priv(netdev); + + /* Priority tagged packets with vlan id 0 are processed by the + * NFP as untagged packets + */ + if (!vid) + return 0; + + nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_VID, vid); + nn_writew(nn, nn->tlv_caps.mbox_off + NFP_NET_CFG_VLAN_FILTER_PROTO, + ETH_P_8021Q); + + return nfp_net_reconfig_mbox(nn, NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_KILL); +} + +static void nfp_net_stat64(struct net_device *netdev, + struct rtnl_link_stats64 *stats) +{ + struct nfp_net *nn = netdev_priv(netdev); + int r; + + for (r = 0; r < nn->max_r_vecs; r++) { + struct nfp_net_r_vector *r_vec = &nn->r_vecs[r]; + u64 data[3]; + unsigned int start; + + do { + start = u64_stats_fetch_begin(&r_vec->rx_sync); + data[0] = r_vec->rx_pkts; + data[1] = r_vec->rx_bytes; + data[2] = r_vec->rx_drops; + } while (u64_stats_fetch_retry(&r_vec->rx_sync, start)); + stats->rx_packets += data[0]; + stats->rx_bytes += data[1]; + stats->rx_dropped += data[2]; + + do { + start = u64_stats_fetch_begin(&r_vec->tx_sync); + data[0] = r_vec->tx_pkts; + data[1] = r_vec->tx_bytes; + data[2] = r_vec->tx_errors; + } while (u64_stats_fetch_retry(&r_vec->tx_sync, start)); + stats->tx_packets += data[0]; + stats->tx_bytes += data[1]; + stats->tx_errors += data[2]; + } +} + +static int nfp_net_set_features(struct net_device *netdev, + netdev_features_t features) +{ + netdev_features_t changed = netdev->features ^ features; + struct nfp_net *nn = netdev_priv(netdev); + u32 new_ctrl; + int err; + + /* Assume this is not called with features we have not advertised */ + + new_ctrl = nn->dp.ctrl; + + if (changed & NETIF_F_RXCSUM) { + if (features & NETIF_F_RXCSUM) + new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM_ANY; + } + + if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { + if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) + new_ctrl |= NFP_NET_CFG_CTRL_TXCSUM; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_TXCSUM; + } + + if (changed & (NETIF_F_TSO | NETIF_F_TSO6)) { + if (features & (NETIF_F_TSO | NETIF_F_TSO6)) + new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?: + NFP_NET_CFG_CTRL_LSO; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY; + } + + if (changed & NETIF_F_HW_VLAN_CTAG_RX) { + if (features & NETIF_F_HW_VLAN_CTAG_RX) + new_ctrl |= NFP_NET_CFG_CTRL_RXVLAN; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_RXVLAN; + } + + if (changed & NETIF_F_HW_VLAN_CTAG_TX) { + if (features & NETIF_F_HW_VLAN_CTAG_TX) + new_ctrl |= NFP_NET_CFG_CTRL_TXVLAN; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_TXVLAN; + } + + if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) { + if (features & NETIF_F_HW_VLAN_CTAG_FILTER) + new_ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_CTAG_FILTER; + } + + if (changed & NETIF_F_SG) { + if (features & NETIF_F_SG) + new_ctrl |= NFP_NET_CFG_CTRL_GATHER; + else + new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER; + } + + err = nfp_port_set_features(netdev, features); + if (err) + return err; + + nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n", + netdev->features, features, changed); + + if (new_ctrl == nn->dp.ctrl) + return 0; + + nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->dp.ctrl, new_ctrl); + nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); + err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN); + if (err) + return err; + + nn->dp.ctrl = new_ctrl; + + return 0; +} + +static netdev_features_t +nfp_net_features_check(struct sk_buff *skb, struct net_device *dev, + netdev_features_t features) +{ + u8 l4_hdr; + + /* We can't do TSO over double tagged packets (802.1AD) */ + features &= vlan_features_check(skb, features); + + if (!skb->encapsulation) + return features; + + /* Ensure that inner L4 header offset fits into TX descriptor field */ + if (skb_is_gso(skb)) { + u32 hdrlen; + + hdrlen = skb_inner_transport_header(skb) - skb->data + + inner_tcp_hdrlen(skb); + + if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ)) + features &= ~NETIF_F_GSO_MASK; + } + + /* VXLAN/GRE check */ + switch (vlan_get_protocol(skb)) { + case htons(ETH_P_IP): + l4_hdr = ip_hdr(skb)->protocol; + break; + case htons(ETH_P_IPV6): + l4_hdr = ipv6_hdr(skb)->nexthdr; + break; + default: + return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); + } + + if (skb->inner_protocol_type != ENCAP_TYPE_ETHER || + skb->inner_protocol != htons(ETH_P_TEB) || + (l4_hdr != IPPROTO_UDP && l4_hdr != IPPROTO_GRE) || + (l4_hdr == IPPROTO_UDP && + (skb_inner_mac_header(skb) - skb_transport_header(skb) != + sizeof(struct udphdr) + sizeof(struct vxlanhdr)))) + return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); + + return features; +} + +static int +nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len) +{ + struct nfp_net *nn = netdev_priv(netdev); + int n; + + if (nn->port) + return nfp_port_get_phys_port_name(netdev, name, len); + + if (nn->dp.is_vf || nn->vnic_no_name) + return -EOPNOTSUPP; + + n = snprintf(name, len, "n%d", nn->id); + if (n >= len) + return -EINVAL; + + return 0; +} + +/** + * nfp_net_set_vxlan_port() - set vxlan port in SW and reconfigure HW + * @nn: NFP Net device to reconfigure + * @idx: Index into the port table where new port should be written + * @port: UDP port to configure (pass zero to remove VXLAN port) + */ +static void nfp_net_set_vxlan_port(struct nfp_net *nn, int idx, __be16 port) +{ + int i; + + nn->vxlan_ports[idx] = port; + + if (!(nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN)) + return; + + BUILD_BUG_ON(NFP_NET_N_VXLAN_PORTS & 1); + for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i += 2) + nn_writel(nn, NFP_NET_CFG_VXLAN_PORT + i * sizeof(port), + be16_to_cpu(nn->vxlan_ports[i + 1]) << 16 | + be16_to_cpu(nn->vxlan_ports[i])); + + nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_VXLAN); +} + +/** + * nfp_net_find_vxlan_idx() - find table entry of the port or a free one + * @nn: NFP Network structure + * @port: UDP port to look for + * + * Return: if the port is already in the table -- it's position; + * if the port is not in the table -- free position to use; + * if the table is full -- -ENOSPC. + */ +static int nfp_net_find_vxlan_idx(struct nfp_net *nn, __be16 port) +{ + int i, free_idx = -ENOSPC; + + for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i++) { + if (nn->vxlan_ports[i] == port) + return i; + if (!nn->vxlan_usecnt[i]) + free_idx = i; + } + + return free_idx; +} + +static void nfp_net_add_vxlan_port(struct net_device *netdev, + struct udp_tunnel_info *ti) +{ + struct nfp_net *nn = netdev_priv(netdev); + int idx; + + if (ti->type != UDP_TUNNEL_TYPE_VXLAN) + return; + + idx = nfp_net_find_vxlan_idx(nn, ti->port); + if (idx == -ENOSPC) + return; + + if (!nn->vxlan_usecnt[idx]++) + nfp_net_set_vxlan_port(nn, idx, ti->port); +} + +static void nfp_net_del_vxlan_port(struct net_device *netdev, + struct udp_tunnel_info *ti) +{ + struct nfp_net *nn = netdev_priv(netdev); + int idx; + + if (ti->type != UDP_TUNNEL_TYPE_VXLAN) + return; + + idx = nfp_net_find_vxlan_idx(nn, ti->port); + if (idx == -ENOSPC || !nn->vxlan_usecnt[idx]) + return; + + if (!--nn->vxlan_usecnt[idx]) + nfp_net_set_vxlan_port(nn, idx, 0); +} + +static int nfp_net_xdp_setup_drv(struct nfp_net *nn, struct netdev_bpf *bpf) +{ + struct bpf_prog *prog = bpf->prog; + struct nfp_net_dp *dp; + int err; + + if (!xdp_attachment_flags_ok(&nn->xdp, bpf)) + return -EBUSY; + + if (!prog == !nn->dp.xdp_prog) { + WRITE_ONCE(nn->dp.xdp_prog, prog); + xdp_attachment_setup(&nn->xdp, bpf); + return 0; + } + + dp = nfp_net_clone_dp(nn); + if (!dp) + return -ENOMEM; + + dp->xdp_prog = prog; + dp->num_tx_rings += prog ? nn->dp.num_rx_rings : -nn->dp.num_rx_rings; + dp->rx_dma_dir = prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE; + dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0; + + /* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */ + err = nfp_net_ring_reconfig(nn, dp, bpf->extack); + if (err) + return err; + + xdp_attachment_setup(&nn->xdp, bpf); + return 0; +} + +static int nfp_net_xdp_setup_hw(struct nfp_net *nn, struct netdev_bpf *bpf) +{ + int err; + + if (!xdp_attachment_flags_ok(&nn->xdp_hw, bpf)) + return -EBUSY; + + err = nfp_app_xdp_offload(nn->app, nn, bpf->prog, bpf->extack); + if (err) + return err; + + xdp_attachment_setup(&nn->xdp_hw, bpf); + return 0; +} + +static int nfp_net_xdp(struct net_device *netdev, struct netdev_bpf *xdp) +{ + struct nfp_net *nn = netdev_priv(netdev); + + switch (xdp->command) { + case XDP_SETUP_PROG: + return nfp_net_xdp_setup_drv(nn, xdp); + case XDP_SETUP_PROG_HW: + return nfp_net_xdp_setup_hw(nn, xdp); + case XDP_QUERY_PROG: + return xdp_attachment_query(&nn->xdp, xdp); + case XDP_QUERY_PROG_HW: + return xdp_attachment_query(&nn->xdp_hw, xdp); + default: + return nfp_app_bpf(nn->app, nn, xdp); + } +} + +static int nfp_net_set_mac_address(struct net_device *netdev, void *addr) +{ + struct nfp_net *nn = netdev_priv(netdev); + struct sockaddr *saddr = addr; + int err; + + err = eth_prepare_mac_addr_change(netdev, addr); + if (err) + return err; + + nfp_net_write_mac_addr(nn, saddr->sa_data); + + err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MACADDR); + if (err) + return err; + + eth_commit_mac_addr_change(netdev, addr); + + return 0; +} + +const struct net_device_ops nfp_net_netdev_ops = { + .ndo_init = nfp_app_ndo_init, + .ndo_uninit = nfp_app_ndo_uninit, + .ndo_open = nfp_net_netdev_open, + .ndo_stop = nfp_net_netdev_close, + .ndo_start_xmit = nfp_net_tx, + .ndo_get_stats64 = nfp_net_stat64, + .ndo_vlan_rx_add_vid = nfp_net_vlan_rx_add_vid, + .ndo_vlan_rx_kill_vid = nfp_net_vlan_rx_kill_vid, + .ndo_set_vf_mac = nfp_app_set_vf_mac, + .ndo_set_vf_vlan = nfp_app_set_vf_vlan, + .ndo_set_vf_spoofchk = nfp_app_set_vf_spoofchk, + .ndo_get_vf_config = nfp_app_get_vf_config, + .ndo_set_vf_link_state = nfp_app_set_vf_link_state, + .ndo_setup_tc = nfp_port_setup_tc, + .ndo_tx_timeout = nfp_net_tx_timeout, + .ndo_set_rx_mode = nfp_net_set_rx_mode, + .ndo_change_mtu = nfp_net_change_mtu, + .ndo_set_mac_address = nfp_net_set_mac_address, + .ndo_set_features = nfp_net_set_features, + .ndo_features_check = nfp_net_features_check, + .ndo_get_phys_port_name = nfp_net_get_phys_port_name, + .ndo_udp_tunnel_add = nfp_net_add_vxlan_port, + .ndo_udp_tunnel_del = nfp_net_del_vxlan_port, + .ndo_bpf = nfp_net_xdp, +}; + +/** + * nfp_net_info() - Print general info about the NIC + * @nn: NFP Net device to reconfigure + */ +void nfp_net_info(struct nfp_net *nn) +{ + nn_info(nn, "Netronome NFP-6xxx %sNetdev: TxQs=%d/%d RxQs=%d/%d\n", + nn->dp.is_vf ? "VF " : "", + nn->dp.num_tx_rings, nn->max_tx_rings, + nn->dp.num_rx_rings, nn->max_rx_rings); + nn_info(nn, "VER: %d.%d.%d.%d, Maximum supported MTU: %d\n", + nn->fw_ver.resv, nn->fw_ver.class, + nn->fw_ver.major, nn->fw_ver.minor, + nn->max_mtu); + nn_info(nn, "CAP: %#x %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n", + nn->cap, + nn->cap & NFP_NET_CFG_CTRL_PROMISC ? "PROMISC " : "", + nn->cap & NFP_NET_CFG_CTRL_L2BC ? "L2BCFILT " : "", + nn->cap & NFP_NET_CFG_CTRL_L2MC ? "L2MCFILT " : "", + nn->cap & NFP_NET_CFG_CTRL_RXCSUM ? "RXCSUM " : "", + nn->cap & NFP_NET_CFG_CTRL_TXCSUM ? "TXCSUM " : "", + nn->cap & NFP_NET_CFG_CTRL_RXVLAN ? "RXVLAN " : "", + nn->cap & NFP_NET_CFG_CTRL_TXVLAN ? "TXVLAN " : "", + nn->cap & NFP_NET_CFG_CTRL_SCATTER ? "SCATTER " : "", + nn->cap & NFP_NET_CFG_CTRL_GATHER ? "GATHER " : "", + nn->cap & NFP_NET_CFG_CTRL_LSO ? "TSO1 " : "", + nn->cap & NFP_NET_CFG_CTRL_LSO2 ? "TSO2 " : "", + nn->cap & NFP_NET_CFG_CTRL_RSS ? "RSS1 " : "", + nn->cap & NFP_NET_CFG_CTRL_RSS2 ? "RSS2 " : "", + nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER ? "CTAG_FILTER " : "", + nn->cap & NFP_NET_CFG_CTRL_L2SWITCH ? "L2SWITCH " : "", + nn->cap & NFP_NET_CFG_CTRL_MSIXAUTO ? "AUTOMASK " : "", + nn->cap & NFP_NET_CFG_CTRL_IRQMOD ? "IRQMOD " : "", + nn->cap & NFP_NET_CFG_CTRL_VXLAN ? "VXLAN " : "", + nn->cap & NFP_NET_CFG_CTRL_NVGRE ? "NVGRE " : "", + nn->cap & NFP_NET_CFG_CTRL_CSUM_COMPLETE ? + "RXCSUM_COMPLETE " : "", + nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR ? "LIVE_ADDR " : "", + nfp_app_extra_cap(nn->app, nn)); +} + +/** + * nfp_net_alloc() - Allocate netdev and related structure + * @pdev: PCI device + * @needs_netdev: Whether to allocate a netdev for this vNIC + * @max_tx_rings: Maximum number of TX rings supported by device + * @max_rx_rings: Maximum number of RX rings supported by device + * + * This function allocates a netdev device and fills in the initial + * part of the @struct nfp_net structure. In case of control device + * nfp_net structure is allocated without the netdev. + * + * Return: NFP Net device structure, or ERR_PTR on error. + */ +struct nfp_net *nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev, + unsigned int max_tx_rings, + unsigned int max_rx_rings) +{ + struct nfp_net *nn; + + if (needs_netdev) { + struct net_device *netdev; + + netdev = alloc_etherdev_mqs(sizeof(struct nfp_net), + max_tx_rings, max_rx_rings); + if (!netdev) + return ERR_PTR(-ENOMEM); + + SET_NETDEV_DEV(netdev, &pdev->dev); + nn = netdev_priv(netdev); + nn->dp.netdev = netdev; + } else { + nn = vzalloc(sizeof(*nn)); + if (!nn) + return ERR_PTR(-ENOMEM); + } + + nn->dp.dev = &pdev->dev; + nn->pdev = pdev; + + nn->max_tx_rings = max_tx_rings; + nn->max_rx_rings = max_rx_rings; + + nn->dp.num_tx_rings = min_t(unsigned int, + max_tx_rings, num_online_cpus()); + nn->dp.num_rx_rings = min_t(unsigned int, max_rx_rings, + netif_get_num_default_rss_queues()); + + nn->dp.num_r_vecs = max(nn->dp.num_tx_rings, nn->dp.num_rx_rings); + nn->dp.num_r_vecs = min_t(unsigned int, + nn->dp.num_r_vecs, num_online_cpus()); + + nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT; + nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT; + + spin_lock_init(&nn->reconfig_lock); + spin_lock_init(&nn->link_status_lock); + + timer_setup(&nn->reconfig_timer, nfp_net_reconfig_timer, 0); + + return nn; +} + +/** + * nfp_net_free() - Undo what @nfp_net_alloc() did + * @nn: NFP Net device to reconfigure + */ +void nfp_net_free(struct nfp_net *nn) +{ + WARN_ON(timer_pending(&nn->reconfig_timer) || nn->reconfig_posted); + if (nn->dp.netdev) + free_netdev(nn->dp.netdev); + else + vfree(nn); +} + +/** + * nfp_net_rss_key_sz() - Get current size of the RSS key + * @nn: NFP Net device instance + * + * Return: size of the RSS key for currently selected hash function. + */ +unsigned int nfp_net_rss_key_sz(struct nfp_net *nn) +{ + switch (nn->rss_hfunc) { + case ETH_RSS_HASH_TOP: + return NFP_NET_CFG_RSS_KEY_SZ; + case ETH_RSS_HASH_XOR: + return 0; + case ETH_RSS_HASH_CRC32: + return 4; + } + + nn_warn(nn, "Unknown hash function: %u\n", nn->rss_hfunc); + return 0; +} + +/** + * nfp_net_rss_init() - Set the initial RSS parameters + * @nn: NFP Net device to reconfigure + */ +static void nfp_net_rss_init(struct nfp_net *nn) +{ + unsigned long func_bit, rss_cap_hfunc; + u32 reg; + + /* Read the RSS function capability and select first supported func */ + reg = nn_readl(nn, NFP_NET_CFG_RSS_CAP); + rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, reg); + if (!rss_cap_hfunc) + rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, + NFP_NET_CFG_RSS_TOEPLITZ); + + func_bit = find_first_bit(&rss_cap_hfunc, NFP_NET_CFG_RSS_HFUNCS); + if (func_bit == NFP_NET_CFG_RSS_HFUNCS) { + dev_warn(nn->dp.dev, + "Bad RSS config, defaulting to Toeplitz hash\n"); + func_bit = ETH_RSS_HASH_TOP_BIT; + } + nn->rss_hfunc = 1 << func_bit; + + netdev_rss_key_fill(nn->rss_key, nfp_net_rss_key_sz(nn)); + + nfp_net_rss_init_itbl(nn); + + /* Enable IPv4/IPv6 TCP by default */ + nn->rss_cfg = NFP_NET_CFG_RSS_IPV4_TCP | + NFP_NET_CFG_RSS_IPV6_TCP | + FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc) | + NFP_NET_CFG_RSS_MASK; +} + +/** + * nfp_net_irqmod_init() - Set the initial IRQ moderation parameters + * @nn: NFP Net device to reconfigure + */ +static void nfp_net_irqmod_init(struct nfp_net *nn) +{ + nn->rx_coalesce_usecs = 50; + nn->rx_coalesce_max_frames = 64; + nn->tx_coalesce_usecs = 50; + nn->tx_coalesce_max_frames = 64; +} + +static void nfp_net_netdev_init(struct nfp_net *nn) +{ + struct net_device *netdev = nn->dp.netdev; + + nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr); + + netdev->mtu = nn->dp.mtu; + + /* Advertise/enable offloads based on capabilities + * + * Note: netdev->features show the currently enabled features + * and netdev->hw_features advertises which features are + * supported. By default we enable most features. + */ + if (nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR) + netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE; + + netdev->hw_features = NETIF_F_HIGHDMA; + if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY) { + netdev->hw_features |= NETIF_F_RXCSUM; + nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY; + } + if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) { + netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXCSUM; + } + if (nn->cap & NFP_NET_CFG_CTRL_GATHER) { + netdev->hw_features |= NETIF_F_SG; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_GATHER; + } + if ((nn->cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) || + nn->cap & NFP_NET_CFG_CTRL_LSO2) { + netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6; + nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?: + NFP_NET_CFG_CTRL_LSO; + } + if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) + netdev->hw_features |= NETIF_F_RXHASH; + if (nn->cap & NFP_NET_CFG_CTRL_VXLAN && + nn->cap & NFP_NET_CFG_CTRL_NVGRE) { + if (nn->cap & NFP_NET_CFG_CTRL_LSO) + netdev->hw_features |= NETIF_F_GSO_GRE | + NETIF_F_GSO_UDP_TUNNEL; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE; + + netdev->hw_enc_features = netdev->hw_features; + } + + netdev->vlan_features = netdev->hw_features; + + if (nn->cap & NFP_NET_CFG_CTRL_RXVLAN) { + netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXVLAN; + } + if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN) { + if (nn->cap & NFP_NET_CFG_CTRL_LSO2) { + nn_warn(nn, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n"); + } else { + netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXVLAN; + } + } + if (nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER) { + netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER; + nn->dp.ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER; + } + + netdev->features = netdev->hw_features; + + if (nfp_app_has_tc(nn->app) && nn->port) + netdev->hw_features |= NETIF_F_HW_TC; + + /* Advertise but disable TSO by default. */ + netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6); + nn->dp.ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY; + + /* Finalise the netdev setup */ + netdev->netdev_ops = &nfp_net_netdev_ops; + netdev->watchdog_timeo = msecs_to_jiffies(5 * 1000); + + SWITCHDEV_SET_OPS(netdev, &nfp_port_switchdev_ops); + + /* MTU range: 68 - hw-specific max */ + netdev->min_mtu = ETH_MIN_MTU; + netdev->max_mtu = nn->max_mtu; + + netdev->gso_max_segs = NFP_NET_LSO_MAX_SEGS; + + netif_carrier_off(netdev); + + nfp_net_set_ethtool_ops(netdev); +} + +static int nfp_net_read_caps(struct nfp_net *nn) +{ + /* Get some of the read-only fields from the BAR */ + nn->cap = nn_readl(nn, NFP_NET_CFG_CAP); + nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU); + + /* ABI 4.x and ctrl vNIC always use chained metadata, in other cases + * we allow use of non-chained metadata if RSS(v1) is the only + * advertised capability requiring metadata. + */ + nn->dp.chained_metadata_format = nn->fw_ver.major == 4 || + !nn->dp.netdev || + !(nn->cap & NFP_NET_CFG_CTRL_RSS) || + nn->cap & NFP_NET_CFG_CTRL_CHAIN_META; + /* RSS(v1) uses non-chained metadata format, except in ABI 4.x where + * it has the same meaning as RSSv2. + */ + if (nn->dp.chained_metadata_format && nn->fw_ver.major != 4) + nn->cap &= ~NFP_NET_CFG_CTRL_RSS; + + /* Determine RX packet/metadata boundary offset */ + if (nn->fw_ver.major >= 2) { + u32 reg; + + reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET); + if (reg > NFP_NET_MAX_PREPEND) { + nn_err(nn, "Invalid rx offset: %d\n", reg); + return -EINVAL; + } + nn->dp.rx_offset = reg; + } else { + nn->dp.rx_offset = NFP_NET_RX_OFFSET; + } + + /* For control vNICs mask out the capabilities app doesn't want. */ + if (!nn->dp.netdev) + nn->cap &= nn->app->type->ctrl_cap_mask; + + return 0; +} + +/** + * nfp_net_init() - Initialise/finalise the nfp_net structure + * @nn: NFP Net device structure + * + * Return: 0 on success or negative errno on error. + */ +int nfp_net_init(struct nfp_net *nn) +{ + int err; + + nn->dp.rx_dma_dir = DMA_FROM_DEVICE; + + err = nfp_net_read_caps(nn); + if (err) + return err; + + /* Set default MTU and Freelist buffer size */ + if (nn->max_mtu < NFP_NET_DEFAULT_MTU) + nn->dp.mtu = nn->max_mtu; + else + nn->dp.mtu = NFP_NET_DEFAULT_MTU; + nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp); + + if (nfp_app_ctrl_uses_data_vnics(nn->app)) + nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_CMSG_DATA; + + if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) { + nfp_net_rss_init(nn); + nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RSS2 ?: + NFP_NET_CFG_CTRL_RSS; + } + + /* Allow L2 Broadcast and Multicast through by default, if supported */ + if (nn->cap & NFP_NET_CFG_CTRL_L2BC) + nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2BC; + + /* Allow IRQ moderation, if supported */ + if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) { + nfp_net_irqmod_init(nn); + nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD; + } + + err = nfp_net_tlv_caps_parse(&nn->pdev->dev, nn->dp.ctrl_bar, + &nn->tlv_caps); + if (err) + return err; + + if (nn->dp.netdev) + nfp_net_netdev_init(nn); + + /* Stash the re-configuration queue away. First odd queue in TX Bar */ + nn->qcp_cfg = nn->tx_bar + NFP_QCP_QUEUE_ADDR_SZ; + + /* Make sure the FW knows the netdev is supposed to be disabled here */ + nn_writel(nn, NFP_NET_CFG_CTRL, 0); + nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0); + nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0); + err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_RING | + NFP_NET_CFG_UPDATE_GEN); + if (err) + return err; + + nfp_net_vecs_init(nn); + + if (!nn->dp.netdev) + return 0; + return register_netdev(nn->dp.netdev); +} + +/** + * nfp_net_clean() - Undo what nfp_net_init() did. + * @nn: NFP Net device structure + */ +void nfp_net_clean(struct nfp_net *nn) +{ + if (!nn->dp.netdev) + return; + + unregister_netdev(nn->dp.netdev); + nfp_net_reconfig_wait_posted(nn); +} |