/* * 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 * Jason McMullan * Rolf Neugebauer * Brad Petrus * Chris Telfer */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nfpcore/nfp_nsp_eth.h" #include "nfp_net_ctrl.h" #include "nfp_net.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 *nn, void *frag, unsigned int bufsz, int direction) { return dma_map_single(&nn->pdev->dev, frag + NFP_NET_RX_BUF_HEADROOM, bufsz - NFP_NET_RX_BUF_NON_DATA, direction); } static void nfp_net_dma_unmap_rx(struct nfp_net *nn, dma_addr_t dma_addr, unsigned int bufsz, int direction) { dma_unmap_single(&nn->pdev->dev, dma_addr, bufsz - NFP_NET_RX_BUF_NON_DATA, direction); } /* 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(unsigned long data) { struct nfp_net *nn = (void *)data; 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); } /** * 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) { bool cancelled_timer = false; u32 pre_posted_requests; int ret; spin_lock_bh(&nn->reconfig_lock); nn->reconfig_sync_present = true; if (nn->reconfig_timer_active) { del_timer(&nn->reconfig_timer); 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) 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); } 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; } /* 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) { nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS; nn->num_r_vecs = nn->max_r_vecs; memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n); if (nn->num_rx_rings > nn->num_r_vecs || nn->num_tx_rings > nn->num_r_vecs) nn_warn(nn, "More rings (%d,%d) than vectors (%d).\n", nn->num_rx_rings, nn->num_tx_rings, nn->num_r_vecs); nn->num_rx_rings = min(nn->num_r_vecs, nn->num_rx_rings); nn->num_tx_rings = min(nn->num_r_vecs, nn->num_tx_rings); nn->num_stack_tx_rings = nn->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; } /** * 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->link_up) { netif_carrier_on(nn->netdev); netdev_info(nn->netdev, "NIC Link is Up\n"); } else { netif_carrier_off(nn->netdev); netdev_info(nn->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 */ static void nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring, struct nfp_net_r_vector *r_vec, unsigned int idx) { struct nfp_net *nn = r_vec->nfp_net; tx_ring->idx = idx; tx_ring->r_vec = r_vec; 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; rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx; rx_ring->rx_qcidx = rx_ring->fl_qcidx + (nn->stride_rx - 1); rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx); rx_ring->qcp_rx = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->rx_qcidx); } /** * nfp_net_vecs_init() - Assign IRQs and setup rvecs. * @netdev: netdev structure */ static void nfp_net_vecs_init(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); 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->handler = nfp_net_irq_rxtx; r_vec->irq_entry = entry->entry; r_vec->irq_vector = entry->vector; cpumask_set_cpu(r, &r_vec->affinity_mask); } } /** * 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, netdev_name(nn->netdev)); 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); 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); 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 * @nn: NFP Net device * @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 *nn, 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) hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); else 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->l4_offset = 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 * @nn: NFP Net device * @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 *nn, 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 (!(nn->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_warn_ratelimit(nn, "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_warn_ratelimit(nn, "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; } /** * 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_r_vector *r_vec; struct nfp_net_tx_desc *txd, txdg; struct nfp_net_tx_buf *txbuf; struct nfp_net_tx_ring *tx_ring; struct netdev_queue *nd_q; dma_addr_t dma_addr; unsigned int fsize; int f, nr_frags; int wr_idx; u16 qidx; qidx = skb_get_queue_mapping(skb); tx_ring = &nn->tx_rings[qidx]; r_vec = tx_ring->r_vec; nd_q = netdev_get_tx_queue(nn->netdev, qidx); nr_frags = skb_shinfo(skb)->nr_frags; if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) { nn_warn_ratelimit(nn, "TX ring %d busy. wrp=%u rdp=%u\n", qidx, tx_ring->wr_p, tx_ring->rd_p); netif_tx_stop_queue(nd_q); u64_stats_update_begin(&r_vec->tx_sync); r_vec->tx_busy++; u64_stats_update_end(&r_vec->tx_sync); return NETDEV_TX_BUSY; } /* Start with the head skbuf */ dma_addr = dma_map_single(&nn->pdev->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); if (dma_mapping_error(&nn->pdev->dev, dma_addr)) goto err_free; wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1); /* 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 : 0; 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->l4_offset = 0; nfp_net_tx_tso(nn, r_vec, txbuf, txd, skb); nfp_net_tx_csum(nn, r_vec, txbuf, txd, skb); if (skb_vlan_tag_present(skb) && nn->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(&nn->pdev->dev, frag, 0, fsize, DMA_TO_DEVICE); if (dma_mapping_error(&nn->pdev->dev, dma_addr)) goto err_unmap; wr_idx = (wr_idx + 1) & (tx_ring->cnt - 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); 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); skb_tx_timestamp(skb); return NETDEV_TX_OK; err_unmap: --f; while (f >= 0) { frag = &skb_shinfo(skb)->frags[f]; dma_unmap_page(&nn->pdev->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(&nn->pdev->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_warn_ratelimit(nn, "Failed to map DMA TX buffer\n"); 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 * * Return: Number of completed TX descriptors */ static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; struct nfp_net *nn = r_vec->nfp_net; 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; /* 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; if (qcp_rd_p > tx_ring->qcp_rd_p) todo = qcp_rd_p - tx_ring->qcp_rd_p; else todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p; while (todo--) { idx = tx_ring->rd_p & (tx_ring->cnt - 1); 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(&nn->pdev->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(&nn->pdev->dev, tx_ring->txbufs[idx].dma_addr, skb_frag_size(frag), DMA_TO_DEVICE); } /* check for last gather fragment */ if (fidx == nr_frags - 1) dev_kfree_skb_any(skb); 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); nd_q = netdev_get_tx_queue(nn->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 void nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; struct nfp_net *nn = r_vec->nfp_net; u32 done_pkts = 0, done_bytes = 0; 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; if (qcp_rd_p > tx_ring->qcp_rd_p) todo = qcp_rd_p - tx_ring->qcp_rd_p; else todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p; while (todo--) { idx = tx_ring->rd_p & (tx_ring->cnt - 1); tx_ring->rd_p++; if (!tx_ring->txbufs[idx].frag) continue; nfp_net_dma_unmap_rx(nn, tx_ring->txbufs[idx].dma_addr, nn->fl_bufsz, DMA_BIDIRECTIONAL); __free_page(virt_to_page(tx_ring->txbufs[idx].frag)); done_pkts++; done_bytes += tx_ring->txbufs[idx].real_len; tx_ring->txbufs[idx].dma_addr = 0; tx_ring->txbufs[idx].frag = 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); 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); } /** * nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers * @nn: NFP Net device * @tx_ring: TX ring structure * * Assumes that the device is stopped */ static void nfp_net_tx_ring_reset(struct nfp_net *nn, struct nfp_net_tx_ring *tx_ring) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; const struct skb_frag_struct *frag; struct pci_dev *pdev = nn->pdev; struct netdev_queue *nd_q; while (tx_ring->rd_p != tx_ring->wr_p) { struct nfp_net_tx_buf *tx_buf; int idx; idx = tx_ring->rd_p & (tx_ring->cnt - 1); tx_buf = &tx_ring->txbufs[idx]; if (tx_ring == r_vec->xdp_ring) { nfp_net_dma_unmap_rx(nn, tx_buf->dma_addr, nn->fl_bufsz, DMA_BIDIRECTIONAL); __free_page(virt_to_page(tx_ring->txbufs[idx].frag)); } else { struct sk_buff *skb = tx_ring->txbufs[idx].skb; int nr_frags = skb_shinfo(skb)->nr_frags; if (tx_buf->fidx == -1) { /* unmap head */ dma_unmap_single(&pdev->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(&pdev->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, sizeof(*tx_ring->txds) * tx_ring->cnt); 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 == r_vec->xdp_ring) return; nd_q = netdev_get_tx_queue(nn->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->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 *nn, unsigned int mtu) { unsigned int fl_bufsz; fl_bufsz = NFP_NET_RX_BUF_HEADROOM; if (nn->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) fl_bufsz += NFP_NET_MAX_PREPEND; else fl_bufsz += nn->rx_offset; fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + 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 * @rx_ring: RX ring structure of the skb * @dma_addr: Pointer to storage for DMA address (output param) * @fl_bufsz: size of freelist buffers * @xdp: Whether XDP is enabled * * 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_rx_ring *rx_ring, dma_addr_t *dma_addr, unsigned int fl_bufsz, bool xdp) { struct nfp_net *nn = rx_ring->r_vec->nfp_net; int direction; void *frag; if (!xdp) frag = netdev_alloc_frag(fl_bufsz); else frag = page_address(alloc_page(GFP_KERNEL | __GFP_COLD)); if (!frag) { nn_warn_ratelimit(nn, "Failed to alloc receive page frag\n"); return NULL; } direction = xdp ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE; *dma_addr = nfp_net_dma_map_rx(nn, frag, fl_bufsz, direction); if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) { nfp_net_free_frag(frag, xdp); nn_warn_ratelimit(nn, "Failed to map DMA RX buffer\n"); return NULL; } return frag; } static void * nfp_net_napi_alloc_one(struct nfp_net *nn, int direction, dma_addr_t *dma_addr) { void *frag; if (!nn->xdp_prog) frag = napi_alloc_frag(nn->fl_bufsz); else frag = page_address(alloc_page(GFP_ATOMIC | __GFP_COLD)); if (!frag) { nn_warn_ratelimit(nn, "Failed to alloc receive page frag\n"); return NULL; } *dma_addr = nfp_net_dma_map_rx(nn, frag, nn->fl_bufsz, direction); if (dma_mapping_error(&nn->pdev->dev, *dma_addr)) { nfp_net_free_frag(frag, nn->xdp_prog); nn_warn_ratelimit(nn, "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 * @rx_ring: RX ring structure * @frag: page fragment buffer * @dma_addr: DMA address of skb mapping */ static void nfp_net_rx_give_one(struct nfp_net_rx_ring *rx_ring, void *frag, dma_addr_t dma_addr) { unsigned int wr_idx; wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1); /* 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); rx_ring->wr_p++; rx_ring->wr_ptr_add++; if (rx_ring->wr_ptr_add >= 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, rx_ring->wr_ptr_add); rx_ring->wr_ptr_add = 0; } } /** * nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable * @rx_ring: RX ring structure * * Warning: Do *not* call if ring buffers were never put on the FW freelist * (i.e. device was not enabled)! */ static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring) { unsigned int wr_idx, last_idx; /* Move the empty entry to the end of the list */ wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1); 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, sizeof(*rx_ring->rxds) * rx_ring->cnt); rx_ring->wr_p = 0; rx_ring->rd_p = 0; rx_ring->wr_ptr_add = 0; } /** * nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring * @nn: NFP Net device * @rx_ring: RX ring to remove buffers from * @xdp: Whether XDP is enabled * * 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 *nn, struct nfp_net_rx_ring *rx_ring, bool xdp) { int direction = xdp ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE; 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(nn, rx_ring->rxbufs[i].dma_addr, rx_ring->bufsz, direction); nfp_net_free_frag(rx_ring->rxbufs[i].frag, xdp); 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) * @nn: NFP Net device * @rx_ring: RX ring to remove buffers from * @xdp: Whether XDP is enabled */ static int nfp_net_rx_ring_bufs_alloc(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring, bool xdp) { 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(rx_ring, &rxbufs[i].dma_addr, rx_ring->bufsz, xdp); if (!rxbufs[i].frag) { nfp_net_rx_ring_bufs_free(nn, rx_ring, xdp); return -ENOMEM; } } return 0; } /** * nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW * @rx_ring: RX ring to fill */ static void nfp_net_rx_ring_fill_freelist(struct nfp_net_rx_ring *rx_ring) { unsigned int i; for (i = 0; i < rx_ring->cnt - 1; i++) nfp_net_rx_give_one(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 * @nn: NFP Net device * @r_vec: per-ring structure * @rxd: Pointer to RX descriptor * @skb: Pointer to SKB */ static void nfp_net_rx_csum(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, struct nfp_net_rx_desc *rxd, struct sk_buff *skb) { skb_checksum_none_assert(skb); if (!(nn->netdev->features & NETIF_F_RXCSUM)) 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 sk_buff *skb, 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: skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L3); break; default: skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L4); break; } } static void nfp_net_set_hash_desc(struct net_device *netdev, struct sk_buff *skb, struct nfp_net_rx_desc *rxd) { struct nfp_net_rx_hash *rx_hash; if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS)) return; rx_hash = (struct nfp_net_rx_hash *)(skb->data - sizeof(*rx_hash)); nfp_net_set_hash(netdev, skb, get_unaligned_be32(&rx_hash->hash_type), &rx_hash->hash); } static void * nfp_net_parse_meta(struct net_device *netdev, struct sk_buff *skb, int meta_len) { u8 *data = skb->data - 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, skb, meta_info & NFP_NET_META_FIELD_MASK, (__be32 *)data); data += 4; break; case NFP_NET_META_MARK: skb->mark = get_unaligned_be32(data); data += 4; break; default: return NULL; } meta_info >>= NFP_NET_META_FIELD_SIZE; } return data; } static void nfp_net_rx_drop(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++; 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(rx_ring, rxbuf->frag, rxbuf->dma_addr); if (skb) dev_kfree_skb_any(skb); } static bool nfp_net_tx_xdp_buf(struct nfp_net *nn, struct nfp_net_rx_ring *rx_ring, struct nfp_net_tx_ring *tx_ring, struct nfp_net_rx_buf *rxbuf, unsigned int pkt_off, unsigned int pkt_len) { struct nfp_net_tx_buf *txbuf; struct nfp_net_tx_desc *txd; dma_addr_t new_dma_addr; void *new_frag; int wr_idx; if (unlikely(nfp_net_tx_full(tx_ring, 1))) { nfp_net_rx_drop(rx_ring->r_vec, rx_ring, rxbuf, NULL); return false; } new_frag = nfp_net_napi_alloc_one(nn, DMA_BIDIRECTIONAL, &new_dma_addr); if (unlikely(!new_frag)) { nfp_net_rx_drop(rx_ring->r_vec, rx_ring, rxbuf, NULL); return false; } nfp_net_rx_give_one(rx_ring, new_frag, new_dma_addr); wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1); /* Stash the soft descriptor of the head then initialize it */ txbuf = &tx_ring->txbufs[wr_idx]; 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(&nn->pdev->dev, rxbuf->dma_addr + pkt_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 + pkt_off); txd->data_len = cpu_to_le16(pkt_len); txd->flags = 0; txd->mss = 0; txd->l4_offset = 0; tx_ring->wr_p++; tx_ring->wr_ptr_add++; return true; } static int nfp_net_run_xdp(struct bpf_prog *prog, void *data, unsigned int len) { struct xdp_buff xdp; xdp.data = data; xdp.data_end = data + len; return bpf_prog_run_xdp(prog, &xdp); } /** * 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 *nn = r_vec->nfp_net; struct nfp_net_tx_ring *tx_ring; struct bpf_prog *xdp_prog; unsigned int true_bufsz; struct sk_buff *skb; int pkts_polled = 0; int rx_dma_map_dir; int idx; rcu_read_lock(); xdp_prog = READ_ONCE(nn->xdp_prog); rx_dma_map_dir = xdp_prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE; true_bufsz = xdp_prog ? PAGE_SIZE : nn->fl_bufsz; tx_ring = r_vec->xdp_ring; while (pkts_polled < budget) { unsigned int meta_len, data_len, data_off, pkt_len, pkt_off; struct nfp_net_rx_buf *rxbuf; struct nfp_net_rx_desc *rxd; dma_addr_t new_dma_addr; void *new_frag; idx = rx_ring->rd_p & (rx_ring->cnt - 1); 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(); 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; if (nn->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC) pkt_off = meta_len; else pkt_off = nn->rx_offset; data_off = NFP_NET_RX_BUF_HEADROOM + pkt_off; /* 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 (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF && nn->bpf_offload_xdp)) { int act; dma_sync_single_for_cpu(&nn->pdev->dev, rxbuf->dma_addr + pkt_off, pkt_len, DMA_BIDIRECTIONAL); act = nfp_net_run_xdp(xdp_prog, rxbuf->frag + data_off, pkt_len); switch (act) { case XDP_PASS: break; case XDP_TX: if (unlikely(!nfp_net_tx_xdp_buf(nn, rx_ring, tx_ring, rxbuf, pkt_off, pkt_len))) trace_xdp_exception(nn->netdev, xdp_prog, act); continue; default: bpf_warn_invalid_xdp_action(act); case XDP_ABORTED: trace_xdp_exception(nn->netdev, xdp_prog, act); case XDP_DROP: nfp_net_rx_give_one(rx_ring, rxbuf->frag, rxbuf->dma_addr); continue; } } skb = build_skb(rxbuf->frag, true_bufsz); if (unlikely(!skb)) { nfp_net_rx_drop(r_vec, rx_ring, rxbuf, NULL); continue; } new_frag = nfp_net_napi_alloc_one(nn, rx_dma_map_dir, &new_dma_addr); if (unlikely(!new_frag)) { nfp_net_rx_drop(r_vec, rx_ring, rxbuf, skb); continue; } nfp_net_dma_unmap_rx(nn, rxbuf->dma_addr, nn->fl_bufsz, rx_dma_map_dir); nfp_net_rx_give_one(rx_ring, new_frag, new_dma_addr); skb_reserve(skb, data_off); skb_put(skb, pkt_len); if (nn->fw_ver.major <= 3) { nfp_net_set_hash_desc(nn->netdev, skb, rxd); } else if (meta_len) { void *end; end = nfp_net_parse_meta(nn->netdev, skb, meta_len); if (unlikely(end != skb->data)) { nn_warn_ratelimit(nn, "invalid RX packet metadata\n"); nfp_net_rx_drop(r_vec, rx_ring, NULL, skb); continue; } } skb_record_rx_queue(skb, rx_ring->idx); skb->protocol = eth_type_trans(skb, nn->netdev); nfp_net_rx_csum(nn, r_vec, rxd, skb); if (rxd->rxd.flags & PCIE_DESC_RX_VLAN) __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), le16_to_cpu(rxd->rxd.vlan)); napi_gro_receive(&rx_ring->r_vec->napi, skb); } if (xdp_prog && tx_ring->wr_ptr_add) nfp_net_tx_xmit_more_flush(tx_ring); 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); if (r_vec->rx_ring) { pkts_polled = nfp_net_rx(r_vec->rx_ring, budget); if (r_vec->xdp_ring) nfp_net_xdp_complete(r_vec->xdp_ring); } if (pkts_polled < budget) { napi_complete_done(napi, pkts_polled); nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry); } return pkts_polled; } /* Setup and Configuration */ /** * 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 *nn = r_vec->nfp_net; struct pci_dev *pdev = nn->pdev; kfree(tx_ring->txbufs); if (tx_ring->txds) dma_free_coherent(&pdev->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 * @tx_ring: TX Ring structure to allocate * @cnt: Ring buffer count * @is_xdp: True if ring will be used for XDP * * Return: 0 on success, negative errno otherwise. */ static int nfp_net_tx_ring_alloc(struct nfp_net_tx_ring *tx_ring, u32 cnt, bool is_xdp) { struct nfp_net_r_vector *r_vec = tx_ring->r_vec; struct nfp_net *nn = r_vec->nfp_net; struct pci_dev *pdev = nn->pdev; int sz; tx_ring->cnt = cnt; tx_ring->size = sizeof(*tx_ring->txds) * tx_ring->cnt; tx_ring->txds = dma_zalloc_coherent(&pdev->dev, tx_ring->size, &tx_ring->dma, GFP_KERNEL); if (!tx_ring->txds) goto err_alloc; sz = sizeof(*tx_ring->txbufs) * tx_ring->cnt; tx_ring->txbufs = kzalloc(sz, GFP_KERNEL); if (!tx_ring->txbufs) goto err_alloc; if (!is_xdp) netif_set_xps_queue(nn->netdev, &r_vec->affinity_mask, tx_ring->idx); nn_dbg(nn, "TxQ%02d: QCidx=%02d cnt=%d dma=%#llx host=%p %s\n", tx_ring->idx, tx_ring->qcidx, tx_ring->cnt, (unsigned long long)tx_ring->dma, tx_ring->txds, is_xdp ? "XDP" : ""); return 0; err_alloc: nfp_net_tx_ring_free(tx_ring); return -ENOMEM; } static struct nfp_net_tx_ring * nfp_net_tx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s, unsigned int num_stack_tx_rings) { struct nfp_net_tx_ring *rings; unsigned int r; rings = kcalloc(s->n_rings, sizeof(*rings), GFP_KERNEL); if (!rings) return NULL; for (r = 0; r < s->n_rings; r++) { int bias = 0; if (r >= num_stack_tx_rings) bias = num_stack_tx_rings; nfp_net_tx_ring_init(&rings[r], &nn->r_vecs[r - bias], r); if (nfp_net_tx_ring_alloc(&rings[r], s->dcnt, bias)) goto err_free_prev; } return s->rings = rings; err_free_prev: while (r--) nfp_net_tx_ring_free(&rings[r]); kfree(rings); return NULL; } static void nfp_net_tx_ring_set_swap(struct nfp_net *nn, struct nfp_net_ring_set *s) { struct nfp_net_ring_set new = *s; s->dcnt = nn->txd_cnt; s->rings = nn->tx_rings; s->n_rings = nn->num_tx_rings; nn->txd_cnt = new.dcnt; nn->tx_rings = new.rings; nn->num_tx_rings = new.n_rings; } static void nfp_net_tx_ring_set_free(struct nfp_net *nn, struct nfp_net_ring_set *s) { struct nfp_net_tx_ring *rings = s->rings; unsigned int r; for (r = 0; r < s->n_rings; r++) nfp_net_tx_ring_free(&rings[r]); kfree(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 *nn = r_vec->nfp_net; struct pci_dev *pdev = nn->pdev; kfree(rx_ring->rxbufs); if (rx_ring->rxds) dma_free_coherent(&pdev->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 * @rx_ring: RX ring to allocate * @fl_bufsz: Size of buffers to allocate * @cnt: Ring buffer count * * Return: 0 on success, negative errno otherwise. */ static int nfp_net_rx_ring_alloc(struct nfp_net_rx_ring *rx_ring, unsigned int fl_bufsz, u32 cnt) { struct nfp_net_r_vector *r_vec = rx_ring->r_vec; struct nfp_net *nn = r_vec->nfp_net; struct pci_dev *pdev = nn->pdev; int sz; rx_ring->cnt = cnt; rx_ring->bufsz = fl_bufsz; rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt; rx_ring->rxds = dma_zalloc_coherent(&pdev->dev, rx_ring->size, &rx_ring->dma, GFP_KERNEL); if (!rx_ring->rxds) goto err_alloc; sz = sizeof(*rx_ring->rxbufs) * rx_ring->cnt; rx_ring->rxbufs = kzalloc(sz, GFP_KERNEL); if (!rx_ring->rxbufs) goto err_alloc; nn_dbg(nn, "RxQ%02d: FlQCidx=%02d RxQCidx=%02d cnt=%d dma=%#llx host=%p\n", rx_ring->idx, rx_ring->fl_qcidx, rx_ring->rx_qcidx, rx_ring->cnt, (unsigned long long)rx_ring->dma, rx_ring->rxds); return 0; err_alloc: nfp_net_rx_ring_free(rx_ring); return -ENOMEM; } static struct nfp_net_rx_ring * nfp_net_rx_ring_set_prepare(struct nfp_net *nn, struct nfp_net_ring_set *s, bool xdp) { unsigned int fl_bufsz = nfp_net_calc_fl_bufsz(nn, s->mtu); struct nfp_net_rx_ring *rings; unsigned int r; rings = kcalloc(s->n_rings, sizeof(*rings), GFP_KERNEL); if (!rings) return NULL; for (r = 0; r < s->n_rings; r++) { nfp_net_rx_ring_init(&rings[r], &nn->r_vecs[r], r); if (nfp_net_rx_ring_alloc(&rings[r], fl_bufsz, s->dcnt)) goto err_free_prev; if (nfp_net_rx_ring_bufs_alloc(nn, &rings[r], xdp)) goto err_free_ring; } return s->rings = rings; err_free_prev: while (r--) { nfp_net_rx_ring_bufs_free(nn, &rings[r], xdp); err_free_ring: nfp_net_rx_ring_free(&rings[r]); } kfree(rings); return NULL; } static void nfp_net_rx_ring_set_swap(struct nfp_net *nn, struct nfp_net_ring_set *s) { struct nfp_net_ring_set new = *s; s->mtu = nn->netdev->mtu; s->dcnt = nn->rxd_cnt; s->rings = nn->rx_rings; s->n_rings = nn->num_rx_rings; nn->netdev->mtu = new.mtu; nn->fl_bufsz = nfp_net_calc_fl_bufsz(nn, new.mtu); nn->rxd_cnt = new.dcnt; nn->rx_rings = new.rings; nn->num_rx_rings = new.n_rings; } static void nfp_net_rx_ring_set_free(struct nfp_net *nn, struct nfp_net_ring_set *s, bool xdp) { struct nfp_net_rx_ring *rings = s->rings; unsigned int r; for (r = 0; r < s->n_rings; r++) { nfp_net_rx_ring_bufs_free(nn, &rings[r], xdp); nfp_net_rx_ring_free(&rings[r]); } kfree(rings); } static void nfp_net_vector_assign_rings(struct nfp_net *nn, struct nfp_net_r_vector *r_vec, int idx) { r_vec->rx_ring = idx < nn->num_rx_rings ? &nn->rx_rings[idx] : NULL; r_vec->tx_ring = idx < nn->num_stack_tx_rings ? &nn->tx_rings[idx] : NULL; r_vec->xdp_ring = idx < nn->num_tx_rings - nn->num_stack_tx_rings ? &nn->tx_rings[nn->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 */ netif_napi_add(nn->netdev, &r_vec->napi, nfp_net_poll, NAPI_POLL_WEIGHT); snprintf(r_vec->name, sizeof(r_vec->name), "%s-rxtx-%d", nn->netdev->name, idx); err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name, r_vec); if (err) { netif_napi_del(&r_vec->napi); 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); netif_napi_del(&r_vec->napi); 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->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->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->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 * * 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) { nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(nn->netdev->dev_addr)); nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(nn->netdev->dev_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 */ static void nfp_net_clear_config_and_disable(struct nfp_net *nn) { u32 new_ctrl, update; unsigned int r; int err; new_ctrl = nn->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->num_rx_rings; r++) nfp_net_rx_ring_reset(&nn->rx_rings[r]); for (r = 0; r < nn->num_tx_rings; r++) nfp_net_tx_ring_reset(nn, &nn->tx_rings[r]); for (r = 0; r < nn->num_r_vecs; r++) nfp_net_vec_clear_ring_data(nn, r); nn->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); } static int __nfp_net_set_config_and_enable(struct nfp_net *nn) { u32 new_ctrl, update = 0; unsigned int r; int err; new_ctrl = nn->ctrl; if (nn->cap & NFP_NET_CFG_CTRL_RSS) { 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->cap & NFP_NET_CFG_CTRL_IRQMOD) { nfp_net_coalesce_write_cfg(nn); new_ctrl |= NFP_NET_CFG_CTRL_IRQMOD; update |= NFP_NET_CFG_UPDATE_IRQMOD; } for (r = 0; r < nn->num_tx_rings; r++) nfp_net_tx_ring_hw_cfg_write(nn, &nn->tx_rings[r], r); for (r = 0; r < nn->num_rx_rings; r++) nfp_net_rx_ring_hw_cfg_write(nn, &nn->rx_rings[r], r); nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->num_tx_rings == 64 ? 0xffffffffffffffffULL : ((u64)1 << nn->num_tx_rings) - 1); nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->num_rx_rings == 64 ? 0xffffffffffffffffULL : ((u64)1 << nn->num_rx_rings) - 1); nfp_net_write_mac_addr(nn); nn_writel(nn, NFP_NET_CFG_MTU, nn->netdev->mtu); nn_writel(nn, NFP_NET_CFG_FLBUFSZ, nn->fl_bufsz - NFP_NET_RX_BUF_NON_DATA); /* 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); nn->ctrl = new_ctrl; for (r = 0; r < nn->num_rx_rings; r++) nfp_net_rx_ring_fill_freelist(&nn->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->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->netdev); } return err; } /** * 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) { int err; err = __nfp_net_set_config_and_enable(nn); if (err) nfp_net_clear_config_and_disable(nn); return err; } /** * 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->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->netdev); enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector); nfp_net_read_link_status(nn); } static int nfp_net_netdev_open(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); struct nfp_net_ring_set rx = { .n_rings = nn->num_rx_rings, .mtu = nn->netdev->mtu, .dcnt = nn->rxd_cnt, }; struct nfp_net_ring_set tx = { .n_rings = nn->num_tx_rings, .dcnt = nn->txd_cnt, }; int err, r; if (nn->ctrl & NFP_NET_CFG_CTRL_ENABLE) { nn_err(nn, "Dev is already enabled: 0x%08x\n", nn->ctrl); return -EBUSY; } /* Step 1: Allocate resources for rings and the like * - Request interrupts * - Allocate RX and TX ring resources * - Setup initial RSS table */ 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->num_r_vecs; r++) { err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); if (err) goto err_cleanup_vec_p; } nn->rx_rings = nfp_net_rx_ring_set_prepare(nn, &rx, nn->xdp_prog); if (!nn->rx_rings) { err = -ENOMEM; goto err_cleanup_vec; } nn->tx_rings = nfp_net_tx_ring_set_prepare(nn, &tx, nn->num_stack_tx_rings); if (!nn->tx_rings) { err = -ENOMEM; goto err_free_rx_rings; } for (r = 0; r < nn->max_r_vecs; r++) nfp_net_vector_assign_rings(nn, &nn->r_vecs[r], r); err = netif_set_real_num_tx_queues(netdev, nn->num_stack_tx_rings); if (err) goto err_free_rings; err = netif_set_real_num_rx_queues(netdev, nn->num_rx_rings); if (err) goto err_free_rings; /* Step 2: Configure the NFP * - 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_net_set_config_and_enable(nn); if (err) goto err_free_rings; /* 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_free_rings: nfp_net_tx_ring_set_free(nn, &tx); err_free_rx_rings: nfp_net_rx_ring_set_free(nn, &rx, nn->xdp_prog); err_cleanup_vec: r = nn->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; } /** * nfp_net_close_stack() - Quiescent 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->netdev); nn->link_up = false; for (r = 0; r < nn->num_r_vecs; r++) { disable_irq(nn->r_vecs[r].irq_vector); napi_disable(&nn->r_vecs[r].napi); } netif_tx_disable(nn->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; for (r = 0; r < nn->num_rx_rings; r++) { nfp_net_rx_ring_bufs_free(nn, &nn->rx_rings[r], nn->xdp_prog); nfp_net_rx_ring_free(&nn->rx_rings[r]); } for (r = 0; r < nn->num_tx_rings; r++) nfp_net_tx_ring_free(&nn->tx_rings[r]); for (r = 0; r < nn->num_r_vecs; r++) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); kfree(nn->rx_rings); kfree(nn->tx_rings); 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); if (!(nn->ctrl & NFP_NET_CFG_CTRL_ENABLE)) { nn_err(nn, "Dev is not up: 0x%08x\n", nn->ctrl); return 0; } /* 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); /* Step 3: Free resources */ nfp_net_close_free_all(nn); nn_dbg(nn, "%s down", netdev->name); return 0; } static void nfp_net_set_rx_mode(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); u32 new_ctrl; new_ctrl = nn->ctrl; 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->ctrl) return; nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl); nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN); nn->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->num_rx_rings); } static int nfp_net_ring_swap_enable(struct nfp_net *nn, unsigned int *num_vecs, unsigned int *stack_tx_rings, struct bpf_prog **xdp_prog, struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx) { unsigned int r; int err; if (rx) nfp_net_rx_ring_set_swap(nn, rx); if (tx) nfp_net_tx_ring_set_swap(nn, tx); swap(*num_vecs, nn->num_r_vecs); swap(*stack_tx_rings, nn->num_stack_tx_rings); *xdp_prog = xchg(&nn->xdp_prog, *xdp_prog); for (r = 0; r < nn->max_r_vecs; r++) nfp_net_vector_assign_rings(nn, &nn->r_vecs[r], r); if (!netif_is_rxfh_configured(nn->netdev)) nfp_net_rss_init_itbl(nn); err = netif_set_real_num_rx_queues(nn->netdev, nn->num_rx_rings); if (err) return err; if (nn->netdev->real_num_tx_queues != nn->num_stack_tx_rings) { err = netif_set_real_num_tx_queues(nn->netdev, nn->num_stack_tx_rings); if (err) return err; } return __nfp_net_set_config_and_enable(nn); } static int nfp_net_check_config(struct nfp_net *nn, struct bpf_prog *xdp_prog, struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx) { /* XDP-enabled tests */ if (!xdp_prog) return 0; if (rx && nfp_net_calc_fl_bufsz(nn, rx->mtu) > PAGE_SIZE) { nn_warn(nn, "MTU too large w/ XDP enabled\n"); return -EINVAL; } if (tx && tx->n_rings > nn->max_tx_rings) { nn_warn(nn, "Insufficient number of TX rings w/ XDP enabled\n"); return -EINVAL; } return 0; } static void nfp_net_ring_reconfig_down(struct nfp_net *nn, struct bpf_prog **xdp_prog, struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx, unsigned int stack_tx_rings, unsigned int num_vecs) { nn->netdev->mtu = rx ? rx->mtu : nn->netdev->mtu; nn->fl_bufsz = nfp_net_calc_fl_bufsz(nn, nn->netdev->mtu); nn->rxd_cnt = rx ? rx->dcnt : nn->rxd_cnt; nn->txd_cnt = tx ? tx->dcnt : nn->txd_cnt; nn->num_rx_rings = rx ? rx->n_rings : nn->num_rx_rings; nn->num_tx_rings = tx ? tx->n_rings : nn->num_tx_rings; nn->num_stack_tx_rings = stack_tx_rings; nn->num_r_vecs = num_vecs; *xdp_prog = xchg(&nn->xdp_prog, *xdp_prog); if (!netif_is_rxfh_configured(nn->netdev)) nfp_net_rss_init_itbl(nn); } int nfp_net_ring_reconfig(struct nfp_net *nn, struct bpf_prog **xdp_prog, struct nfp_net_ring_set *rx, struct nfp_net_ring_set *tx) { unsigned int stack_tx_rings, num_vecs, r; int err; stack_tx_rings = tx ? tx->n_rings : nn->num_tx_rings; if (*xdp_prog) stack_tx_rings -= rx ? rx->n_rings : nn->num_rx_rings; num_vecs = max(rx ? rx->n_rings : nn->num_rx_rings, stack_tx_rings); err = nfp_net_check_config(nn, *xdp_prog, rx, tx); if (err) return err; if (!netif_running(nn->netdev)) { nfp_net_ring_reconfig_down(nn, xdp_prog, rx, tx, stack_tx_rings, num_vecs); return 0; } /* Prepare new rings */ for (r = nn->num_r_vecs; r < num_vecs; r++) { err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r); if (err) { num_vecs = r; goto err_cleanup_vecs; } } if (rx) { if (!nfp_net_rx_ring_set_prepare(nn, rx, *xdp_prog)) { err = -ENOMEM; goto err_cleanup_vecs; } } if (tx) { if (!nfp_net_tx_ring_set_prepare(nn, tx, stack_tx_rings)) { err = -ENOMEM; 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_ring_swap_enable(nn, &num_vecs, &stack_tx_rings, xdp_prog, rx, tx); if (err) { int err2; nfp_net_clear_config_and_disable(nn); /* Try with old configuration and old rings */ err2 = nfp_net_ring_swap_enable(nn, &num_vecs, &stack_tx_rings, xdp_prog, rx, tx); if (err2) nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n", err, err2); } for (r = num_vecs - 1; r >= nn->num_r_vecs; r--) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); if (rx) nfp_net_rx_ring_set_free(nn, rx, *xdp_prog); if (tx) nfp_net_tx_ring_set_free(nn, tx); nfp_net_open_stack(nn); return err; err_free_rx: if (rx) nfp_net_rx_ring_set_free(nn, rx, *xdp_prog); err_cleanup_vecs: for (r = num_vecs - 1; r >= nn->num_r_vecs; r--) nfp_net_cleanup_vector(nn, &nn->r_vecs[r]); 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_ring_set rx = { .n_rings = nn->num_rx_rings, .mtu = new_mtu, .dcnt = nn->rxd_cnt, }; return nfp_net_ring_reconfig(nn, &nn->xdp_prog, &rx, NULL); } 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->num_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 bool nfp_net_ebpf_capable(struct nfp_net *nn) { if (nn->cap & NFP_NET_CFG_CTRL_BPF && nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI) return true; return false; } static int nfp_net_setup_tc(struct net_device *netdev, u32 handle, __be16 proto, struct tc_to_netdev *tc) { struct nfp_net *nn = netdev_priv(netdev); if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS)) return -ENOTSUPP; if (proto != htons(ETH_P_ALL)) return -ENOTSUPP; if (tc->type == TC_SETUP_CLSBPF && nfp_net_ebpf_capable(nn)) { if (!nn->bpf_offload_xdp) return nfp_net_bpf_offload(nn, tc->cls_bpf); else return -EBUSY; } return -EINVAL; } 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->ctrl; if (changed & NETIF_F_RXCSUM) { if (features & NETIF_F_RXCSUM) new_ctrl |= NFP_NET_CFG_CTRL_RXCSUM; else new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM; } 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 |= NFP_NET_CFG_CTRL_LSO; else new_ctrl &= ~NFP_NET_CFG_CTRL_LSO; } 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_SG) { if (features & NETIF_F_SG) new_ctrl |= NFP_NET_CFG_CTRL_GATHER; else new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER; } if (changed & NETIF_F_HW_TC && nn->ctrl & NFP_NET_CFG_CTRL_BPF) { nn_err(nn, "Cannot disable HW TC offload while in use\n"); return -EBUSY; } nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n", netdev->features, features, changed); if (new_ctrl == nn->ctrl) return 0; nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->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->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 err; if (!nn->eth_port) return -EOPNOTSUPP; if (!nn->eth_port->is_split) err = snprintf(name, len, "p%d", nn->eth_port->label_port); else err = snprintf(name, len, "p%ds%d", nn->eth_port->label_port, nn->eth_port->label_subport); if (err >= 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->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_offload(struct nfp_net *nn, struct bpf_prog *prog) { struct tc_cls_bpf_offload cmd = { .prog = prog, }; int ret; if (!nfp_net_ebpf_capable(nn)) return -EINVAL; if (nn->ctrl & NFP_NET_CFG_CTRL_BPF) { if (!nn->bpf_offload_xdp) return prog ? -EBUSY : 0; cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY; } else { if (!prog) return 0; cmd.command = TC_CLSBPF_ADD; } ret = nfp_net_bpf_offload(nn, &cmd); /* Stop offload if replace not possible */ if (ret && cmd.command == TC_CLSBPF_REPLACE) nfp_net_xdp_offload(nn, NULL); nn->bpf_offload_xdp = prog && !ret; return ret; } static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog) { struct nfp_net_ring_set rx = { .n_rings = nn->num_rx_rings, .mtu = nn->netdev->mtu, .dcnt = nn->rxd_cnt, }; struct nfp_net_ring_set tx = { .n_rings = nn->num_tx_rings, .dcnt = nn->txd_cnt, }; int err; if (prog && prog->xdp_adjust_head) { nn_err(nn, "Does not support bpf_xdp_adjust_head()\n"); return -EOPNOTSUPP; } if (!prog && !nn->xdp_prog) return 0; if (prog && nn->xdp_prog) { prog = xchg(&nn->xdp_prog, prog); bpf_prog_put(prog); nfp_net_xdp_offload(nn, nn->xdp_prog); return 0; } tx.n_rings += prog ? nn->num_rx_rings : -nn->num_rx_rings; /* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */ err = nfp_net_ring_reconfig(nn, &prog, &rx, &tx); if (err) return err; /* @prog got swapped and is now the old one */ if (prog) bpf_prog_put(prog); nfp_net_xdp_offload(nn, nn->xdp_prog); return 0; } static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp) { struct nfp_net *nn = netdev_priv(netdev); switch (xdp->command) { case XDP_SETUP_PROG: return nfp_net_xdp_setup(nn, xdp->prog); case XDP_QUERY_PROG: xdp->prog_attached = !!nn->xdp_prog; return 0; default: return -EINVAL; } } static const struct net_device_ops nfp_net_netdev_ops = { .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_setup_tc = nfp_net_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 = eth_mac_addr, .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_xdp = 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->is_vf ? "VF " : "", nn->num_tx_rings, nn->max_tx_rings, nn->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\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 ? "TSO " : "", nn->cap & NFP_NET_CFG_CTRL_RSS ? "RSS " : "", 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 " : "", nfp_net_ebpf_capable(nn) ? "BPF " : ""); } /** * nfp_net_netdev_alloc() - Allocate netdev and related structure * @pdev: PCI device * @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. * * Return: NFP Net device structure, or ERR_PTR on error. */ struct nfp_net *nfp_net_netdev_alloc(struct pci_dev *pdev, unsigned int max_tx_rings, unsigned int max_rx_rings) { struct net_device *netdev; struct nfp_net *nn; 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->netdev = netdev; nn->pdev = pdev; nn->max_tx_rings = max_tx_rings; nn->max_rx_rings = max_rx_rings; nn->num_tx_rings = min_t(unsigned int, max_tx_rings, num_online_cpus()); nn->num_rx_rings = min_t(unsigned int, max_rx_rings, netif_get_num_default_rss_queues()); nn->num_r_vecs = max(nn->num_tx_rings, nn->num_rx_rings); nn->num_r_vecs = min_t(unsigned int, nn->num_r_vecs, num_online_cpus()); nn->txd_cnt = NFP_NET_TX_DESCS_DEFAULT; nn->rxd_cnt = NFP_NET_RX_DESCS_DEFAULT; spin_lock_init(&nn->reconfig_lock); spin_lock_init(&nn->rx_filter_lock); spin_lock_init(&nn->link_status_lock); setup_timer(&nn->reconfig_timer, nfp_net_reconfig_timer, (unsigned long)nn); setup_timer(&nn->rx_filter_stats_timer, nfp_net_filter_stats_timer, (unsigned long)nn); return nn; } /** * nfp_net_netdev_free() - Undo what @nfp_net_netdev_alloc() did * @nn: NFP Net device to reconfigure */ void nfp_net_netdev_free(struct nfp_net *nn) { free_netdev(nn->netdev); } /** * 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->pdev->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; } /** * nfp_net_netdev_init() - Initialise/finalise the netdev structure * @netdev: netdev structure * * Return: 0 on success or negative errno on error. */ int nfp_net_netdev_init(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); int err; /* 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); nfp_net_write_mac_addr(nn); /* Determine RX packet/metadata boundary offset */ if (nn->fw_ver.major >= 2) nn->rx_offset = nn_readl(nn, NFP_NET_CFG_RX_OFFSET); else nn->rx_offset = NFP_NET_RX_OFFSET; /* Set default MTU and Freelist buffer size */ if (nn->max_mtu < NFP_NET_DEFAULT_MTU) netdev->mtu = nn->max_mtu; else netdev->mtu = NFP_NET_DEFAULT_MTU; nn->fl_bufsz = nfp_net_calc_fl_bufsz(nn, netdev->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. */ netdev->hw_features = NETIF_F_HIGHDMA; if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM) { netdev->hw_features |= NETIF_F_RXCSUM; nn->ctrl |= NFP_NET_CFG_CTRL_RXCSUM; } if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) { netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; nn->ctrl |= NFP_NET_CFG_CTRL_TXCSUM; } if (nn->cap & NFP_NET_CFG_CTRL_GATHER) { netdev->hw_features |= NETIF_F_SG; nn->ctrl |= NFP_NET_CFG_CTRL_GATHER; } if ((nn->cap & NFP_NET_CFG_CTRL_LSO) && nn->fw_ver.major > 2) { netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6; nn->ctrl |= NFP_NET_CFG_CTRL_LSO; } if (nn->cap & NFP_NET_CFG_CTRL_RSS) { netdev->hw_features |= NETIF_F_RXHASH; nfp_net_rss_init(nn); nn->ctrl |= NFP_NET_CFG_CTRL_RSS; } 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->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->ctrl |= NFP_NET_CFG_CTRL_RXVLAN; } if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN) { netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX; nn->ctrl |= NFP_NET_CFG_CTRL_TXVLAN; } netdev->features = netdev->hw_features; if (nfp_net_ebpf_capable(nn)) netdev->hw_features |= NETIF_F_HW_TC; /* Advertise but disable TSO by default. */ netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6); /* Allow L2 Broadcast and Multicast through by default, if supported */ if (nn->cap & NFP_NET_CFG_CTRL_L2BC) nn->ctrl |= NFP_NET_CFG_CTRL_L2BC; if (nn->cap & NFP_NET_CFG_CTRL_L2MC) nn->ctrl |= NFP_NET_CFG_CTRL_L2MC; /* Allow IRQ moderation, if supported */ if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) { nfp_net_irqmod_init(nn); nn->ctrl |= NFP_NET_CFG_CTRL_IRQMOD; } /* 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; /* Finalise the netdev setup */ netdev->netdev_ops = &nfp_net_netdev_ops; netdev->watchdog_timeo = msecs_to_jiffies(5 * 1000); /* MTU range: 68 - hw-specific max */ netdev->min_mtu = ETH_MIN_MTU; netdev->max_mtu = nn->max_mtu; netif_carrier_off(netdev); nfp_net_set_ethtool_ops(netdev); nfp_net_vecs_init(netdev); return register_netdev(netdev); } /** * nfp_net_netdev_clean() - Undo what nfp_net_netdev_init() did. * @netdev: netdev structure */ void nfp_net_netdev_clean(struct net_device *netdev) { struct nfp_net *nn = netdev_priv(netdev); if (nn->xdp_prog) bpf_prog_put(nn->xdp_prog); if (nn->bpf_offload_xdp) nfp_net_xdp_offload(nn, NULL); unregister_netdev(nn->netdev); }