2 * Copyright (C) 2015-2017 Netronome Systems, Inc.
4 * This software is dual licensed under the GNU General License Version 2,
5 * June 1991 as shown in the file COPYING in the top-level directory of this
6 * source tree or the BSD 2-Clause License provided below. You have the
7 * option to license this software under the complete terms of either license.
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12 * without modification, are permitted provided that the following
15 * 1. Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * 2. Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 * Netronome network device driver: Common functions between PF and VF
37 * Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
38 * Jason McMullan <jason.mcmullan@netronome.com>
39 * Rolf Neugebauer <rolf.neugebauer@netronome.com>
40 * Brad Petrus <brad.petrus@netronome.com>
41 * Chris Telfer <chris.telfer@netronome.com>
44 #include <linux/bitfield.h>
45 #include <linux/bpf.h>
46 #include <linux/bpf_trace.h>
47 #include <linux/module.h>
48 #include <linux/kernel.h>
49 #include <linux/init.h>
51 #include <linux/netdevice.h>
52 #include <linux/etherdevice.h>
53 #include <linux/interrupt.h>
55 #include <linux/ipv6.h>
56 #include <linux/page_ref.h>
57 #include <linux/pci.h>
58 #include <linux/pci_regs.h>
59 #include <linux/msi.h>
60 #include <linux/ethtool.h>
61 #include <linux/log2.h>
62 #include <linux/if_vlan.h>
63 #include <linux/random.h>
64 #include <linux/vmalloc.h>
65 #include <linux/ktime.h>
67 #include <net/switchdev.h>
68 #include <net/vxlan.h>
70 #include "nfpcore/nfp_nsp.h"
72 #include "nfp_net_ctrl.h"
77 * nfp_net_get_fw_version() - Read and parse the FW version
78 * @fw_ver: Output fw_version structure to read to
79 * @ctrl_bar: Mapped address of the control BAR
81 void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
82 void __iomem *ctrl_bar)
86 reg = readl(ctrl_bar + NFP_NET_CFG_VERSION);
87 put_unaligned_le32(reg, fw_ver);
90 static dma_addr_t nfp_net_dma_map_rx(struct nfp_net_dp *dp, void *frag)
92 return dma_map_single_attrs(dp->dev, frag + NFP_NET_RX_BUF_HEADROOM,
93 dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
94 dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
98 nfp_net_dma_sync_dev_rx(const struct nfp_net_dp *dp, dma_addr_t dma_addr)
100 dma_sync_single_for_device(dp->dev, dma_addr,
101 dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
105 static void nfp_net_dma_unmap_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr)
107 dma_unmap_single_attrs(dp->dev, dma_addr,
108 dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
109 dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
112 static void nfp_net_dma_sync_cpu_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr,
115 dma_sync_single_for_cpu(dp->dev, dma_addr - NFP_NET_RX_BUF_HEADROOM,
116 len, dp->rx_dma_dir);
121 * Firmware reconfig may take a while so we have two versions of it -
122 * synchronous and asynchronous (posted). All synchronous callers are holding
123 * RTNL so we don't have to worry about serializing them.
125 static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update)
127 nn_writel(nn, NFP_NET_CFG_UPDATE, update);
128 /* ensure update is written before pinging HW */
130 nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1);
133 /* Pass 0 as update to run posted reconfigs. */
134 static void nfp_net_reconfig_start_async(struct nfp_net *nn, u32 update)
136 update |= nn->reconfig_posted;
137 nn->reconfig_posted = 0;
139 nfp_net_reconfig_start(nn, update);
141 nn->reconfig_timer_active = true;
142 mod_timer(&nn->reconfig_timer, jiffies + NFP_NET_POLL_TIMEOUT * HZ);
145 static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check)
149 reg = nn_readl(nn, NFP_NET_CFG_UPDATE);
152 if (reg & NFP_NET_CFG_UPDATE_ERR) {
153 nn_err(nn, "Reconfig error: 0x%08x\n", reg);
155 } else if (last_check) {
156 nn_err(nn, "Reconfig timeout: 0x%08x\n", reg);
163 static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
165 bool timed_out = false;
167 /* Poll update field, waiting for NFP to ack the config */
168 while (!nfp_net_reconfig_check_done(nn, timed_out)) {
170 timed_out = time_is_before_eq_jiffies(deadline);
173 if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR)
176 return timed_out ? -EIO : 0;
179 static void nfp_net_reconfig_timer(unsigned long data)
181 struct nfp_net *nn = (void *)data;
183 spin_lock_bh(&nn->reconfig_lock);
185 nn->reconfig_timer_active = false;
187 /* If sync caller is present it will take over from us */
188 if (nn->reconfig_sync_present)
191 /* Read reconfig status and report errors */
192 nfp_net_reconfig_check_done(nn, true);
194 if (nn->reconfig_posted)
195 nfp_net_reconfig_start_async(nn, 0);
197 spin_unlock_bh(&nn->reconfig_lock);
201 * nfp_net_reconfig_post() - Post async reconfig request
202 * @nn: NFP Net device to reconfigure
203 * @update: The value for the update field in the BAR config
205 * Record FW reconfiguration request. Reconfiguration will be kicked off
206 * whenever reconfiguration machinery is idle. Multiple requests can be
209 static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update)
211 spin_lock_bh(&nn->reconfig_lock);
213 /* Sync caller will kick off async reconf when it's done, just post */
214 if (nn->reconfig_sync_present) {
215 nn->reconfig_posted |= update;
219 /* Opportunistically check if the previous command is done */
220 if (!nn->reconfig_timer_active ||
221 nfp_net_reconfig_check_done(nn, false))
222 nfp_net_reconfig_start_async(nn, update);
224 nn->reconfig_posted |= update;
226 spin_unlock_bh(&nn->reconfig_lock);
230 * nfp_net_reconfig() - Reconfigure the firmware
231 * @nn: NFP Net device to reconfigure
232 * @update: The value for the update field in the BAR config
234 * Write the update word to the BAR and ping the reconfig queue. The
235 * poll until the firmware has acknowledged the update by zeroing the
238 * Return: Negative errno on error, 0 on success
240 int nfp_net_reconfig(struct nfp_net *nn, u32 update)
242 bool cancelled_timer = false;
243 u32 pre_posted_requests;
246 spin_lock_bh(&nn->reconfig_lock);
248 nn->reconfig_sync_present = true;
250 if (nn->reconfig_timer_active) {
251 del_timer(&nn->reconfig_timer);
252 nn->reconfig_timer_active = false;
253 cancelled_timer = true;
255 pre_posted_requests = nn->reconfig_posted;
256 nn->reconfig_posted = 0;
258 spin_unlock_bh(&nn->reconfig_lock);
261 nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires);
263 /* Run the posted reconfigs which were issued before we started */
264 if (pre_posted_requests) {
265 nfp_net_reconfig_start(nn, pre_posted_requests);
266 nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
269 nfp_net_reconfig_start(nn, update);
270 ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
272 spin_lock_bh(&nn->reconfig_lock);
274 if (nn->reconfig_posted)
275 nfp_net_reconfig_start_async(nn, 0);
277 nn->reconfig_sync_present = false;
279 spin_unlock_bh(&nn->reconfig_lock);
285 * nfp_net_reconfig_mbox() - Reconfigure the firmware via the mailbox
286 * @nn: NFP Net device to reconfigure
287 * @mbox_cmd: The value for the mailbox command
289 * Helper function for mailbox updates
291 * Return: Negative errno on error, 0 on success
293 static int nfp_net_reconfig_mbox(struct nfp_net *nn, u32 mbox_cmd)
297 nn_writeq(nn, NFP_NET_CFG_MBOX_CMD, mbox_cmd);
299 ret = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX);
301 nn_err(nn, "Mailbox update error\n");
305 return -nn_readl(nn, NFP_NET_CFG_MBOX_RET);
308 /* Interrupt configuration and handling
312 * nfp_net_irq_unmask() - Unmask automasked interrupt
313 * @nn: NFP Network structure
314 * @entry_nr: MSI-X table entry
316 * Clear the ICR for the IRQ entry.
318 static void nfp_net_irq_unmask(struct nfp_net *nn, unsigned int entry_nr)
320 nn_writeb(nn, NFP_NET_CFG_ICR(entry_nr), NFP_NET_CFG_ICR_UNMASKED);
325 * nfp_net_irqs_alloc() - allocates MSI-X irqs
326 * @pdev: PCI device structure
327 * @irq_entries: Array to be initialized and used to hold the irq entries
328 * @min_irqs: Minimal acceptable number of interrupts
329 * @wanted_irqs: Target number of interrupts to allocate
331 * Return: Number of irqs obtained or 0 on error.
334 nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries,
335 unsigned int min_irqs, unsigned int wanted_irqs)
340 for (i = 0; i < wanted_irqs; i++)
341 irq_entries[i].entry = i;
343 got_irqs = pci_enable_msix_range(pdev, irq_entries,
344 min_irqs, wanted_irqs);
346 dev_err(&pdev->dev, "Failed to enable %d-%d MSI-X (err=%d)\n",
347 min_irqs, wanted_irqs, got_irqs);
351 if (got_irqs < wanted_irqs)
352 dev_warn(&pdev->dev, "Unable to allocate %d IRQs got only %d\n",
353 wanted_irqs, got_irqs);
359 * nfp_net_irqs_assign() - Assign interrupts allocated externally to netdev
360 * @nn: NFP Network structure
361 * @irq_entries: Table of allocated interrupts
362 * @n: Size of @irq_entries (number of entries to grab)
364 * After interrupts are allocated with nfp_net_irqs_alloc() this function
365 * should be called to assign them to a specific netdev (port).
368 nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
371 struct nfp_net_dp *dp = &nn->dp;
373 nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS;
374 dp->num_r_vecs = nn->max_r_vecs;
376 memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n);
378 if (dp->num_rx_rings > dp->num_r_vecs ||
379 dp->num_tx_rings > dp->num_r_vecs)
380 dev_warn(nn->dp.dev, "More rings (%d,%d) than vectors (%d).\n",
381 dp->num_rx_rings, dp->num_tx_rings,
384 dp->num_rx_rings = min(dp->num_r_vecs, dp->num_rx_rings);
385 dp->num_tx_rings = min(dp->num_r_vecs, dp->num_tx_rings);
386 dp->num_stack_tx_rings = dp->num_tx_rings;
390 * nfp_net_irqs_disable() - Disable interrupts
391 * @pdev: PCI device structure
393 * Undoes what @nfp_net_irqs_alloc() does.
395 void nfp_net_irqs_disable(struct pci_dev *pdev)
397 pci_disable_msix(pdev);
401 * nfp_net_irq_rxtx() - Interrupt service routine for RX/TX rings.
403 * @data: Opaque data structure
405 * Return: Indicate if the interrupt has been handled.
407 static irqreturn_t nfp_net_irq_rxtx(int irq, void *data)
409 struct nfp_net_r_vector *r_vec = data;
411 napi_schedule_irqoff(&r_vec->napi);
413 /* The FW auto-masks any interrupt, either via the MASK bit in
414 * the MSI-X table or via the per entry ICR field. So there
415 * is no need to disable interrupts here.
420 static irqreturn_t nfp_ctrl_irq_rxtx(int irq, void *data)
422 struct nfp_net_r_vector *r_vec = data;
424 tasklet_schedule(&r_vec->tasklet);
430 * nfp_net_read_link_status() - Reread link status from control BAR
431 * @nn: NFP Network structure
433 static void nfp_net_read_link_status(struct nfp_net *nn)
439 spin_lock_irqsave(&nn->link_status_lock, flags);
441 sts = nn_readl(nn, NFP_NET_CFG_STS);
442 link_up = !!(sts & NFP_NET_CFG_STS_LINK);
444 if (nn->link_up == link_up)
447 nn->link_up = link_up;
449 set_bit(NFP_PORT_CHANGED, &nn->port->flags);
452 netif_carrier_on(nn->dp.netdev);
453 netdev_info(nn->dp.netdev, "NIC Link is Up\n");
455 netif_carrier_off(nn->dp.netdev);
456 netdev_info(nn->dp.netdev, "NIC Link is Down\n");
459 spin_unlock_irqrestore(&nn->link_status_lock, flags);
463 * nfp_net_irq_lsc() - Interrupt service routine for link state changes
465 * @data: Opaque data structure
467 * Return: Indicate if the interrupt has been handled.
469 static irqreturn_t nfp_net_irq_lsc(int irq, void *data)
471 struct nfp_net *nn = data;
472 struct msix_entry *entry;
474 entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX];
476 nfp_net_read_link_status(nn);
478 nfp_net_irq_unmask(nn, entry->entry);
484 * nfp_net_irq_exn() - Interrupt service routine for exceptions
486 * @data: Opaque data structure
488 * Return: Indicate if the interrupt has been handled.
490 static irqreturn_t nfp_net_irq_exn(int irq, void *data)
492 struct nfp_net *nn = data;
494 nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__);
495 /* XXX TO BE IMPLEMENTED */
500 * nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring
501 * @tx_ring: TX ring structure
502 * @r_vec: IRQ vector servicing this ring
504 * @is_xdp: Is this an XDP TX ring?
507 nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring,
508 struct nfp_net_r_vector *r_vec, unsigned int idx,
511 struct nfp_net *nn = r_vec->nfp_net;
514 tx_ring->r_vec = r_vec;
515 tx_ring->is_xdp = is_xdp;
516 u64_stats_init(&tx_ring->r_vec->tx_sync);
518 tx_ring->qcidx = tx_ring->idx * nn->stride_tx;
519 tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx);
523 * nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring
524 * @rx_ring: RX ring structure
525 * @r_vec: IRQ vector servicing this ring
529 nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring,
530 struct nfp_net_r_vector *r_vec, unsigned int idx)
532 struct nfp_net *nn = r_vec->nfp_net;
535 rx_ring->r_vec = r_vec;
536 u64_stats_init(&rx_ring->r_vec->rx_sync);
538 rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx;
539 rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx);
543 * nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN)
544 * @nn: NFP Network structure
545 * @ctrl_offset: Control BAR offset where IRQ configuration should be written
546 * @format: printf-style format to construct the interrupt name
547 * @name: Pointer to allocated space for interrupt name
548 * @name_sz: Size of space for interrupt name
549 * @vector_idx: Index of MSI-X vector used for this interrupt
550 * @handler: IRQ handler to register for this interrupt
553 nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset,
554 const char *format, char *name, size_t name_sz,
555 unsigned int vector_idx, irq_handler_t handler)
557 struct msix_entry *entry;
560 entry = &nn->irq_entries[vector_idx];
562 snprintf(name, name_sz, format, nfp_net_name(nn));
563 err = request_irq(entry->vector, handler, 0, name, nn);
565 nn_err(nn, "Failed to request IRQ %d (err=%d).\n",
569 nn_writeb(nn, ctrl_offset, entry->entry);
575 * nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN)
576 * @nn: NFP Network structure
577 * @ctrl_offset: Control BAR offset where IRQ configuration should be written
578 * @vector_idx: Index of MSI-X vector used for this interrupt
580 static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset,
581 unsigned int vector_idx)
583 nn_writeb(nn, ctrl_offset, 0xff);
584 free_irq(nn->irq_entries[vector_idx].vector, nn);
589 * One queue controller peripheral queue is used for transmit. The
590 * driver en-queues packets for transmit by advancing the write
591 * pointer. The device indicates that packets have transmitted by
592 * advancing the read pointer. The driver maintains a local copy of
593 * the read and write pointer in @struct nfp_net_tx_ring. The driver
594 * keeps @wr_p in sync with the queue controller write pointer and can
595 * determine how many packets have been transmitted by comparing its
596 * copy of the read pointer @rd_p with the read pointer maintained by
597 * the queue controller peripheral.
601 * nfp_net_tx_full() - Check if the TX ring is full
602 * @tx_ring: TX ring to check
603 * @dcnt: Number of descriptors that need to be enqueued (must be >= 1)
605 * This function checks, based on the *host copy* of read/write
606 * pointer if a given TX ring is full. The real TX queue may have
607 * some newly made available slots.
609 * Return: True if the ring is full.
611 static int nfp_net_tx_full(struct nfp_net_tx_ring *tx_ring, int dcnt)
613 return (tx_ring->wr_p - tx_ring->rd_p) >= (tx_ring->cnt - dcnt);
616 /* Wrappers for deciding when to stop and restart TX queues */
617 static int nfp_net_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
619 return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4);
622 static int nfp_net_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
624 return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1);
628 * nfp_net_tx_ring_stop() - stop tx ring
629 * @nd_q: netdev queue
630 * @tx_ring: driver tx queue structure
632 * Safely stop TX ring. Remember that while we are running .start_xmit()
633 * someone else may be cleaning the TX ring completions so we need to be
634 * extra careful here.
636 static void nfp_net_tx_ring_stop(struct netdev_queue *nd_q,
637 struct nfp_net_tx_ring *tx_ring)
639 netif_tx_stop_queue(nd_q);
641 /* We can race with the TX completion out of NAPI so recheck */
643 if (unlikely(nfp_net_tx_ring_should_wake(tx_ring)))
644 netif_tx_start_queue(nd_q);
648 * nfp_net_tx_tso() - Set up Tx descriptor for LSO
649 * @r_vec: per-ring structure
650 * @txbuf: Pointer to driver soft TX descriptor
651 * @txd: Pointer to HW TX descriptor
652 * @skb: Pointer to SKB
654 * Set up Tx descriptor for LSO, do nothing for non-LSO skbs.
655 * Return error on packet header greater than maximum supported LSO header size.
657 static void nfp_net_tx_tso(struct nfp_net_r_vector *r_vec,
658 struct nfp_net_tx_buf *txbuf,
659 struct nfp_net_tx_desc *txd, struct sk_buff *skb)
664 if (!skb_is_gso(skb))
667 if (!skb->encapsulation) {
668 txd->l3_offset = skb_network_offset(skb);
669 txd->l4_offset = skb_transport_offset(skb);
670 hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
672 txd->l3_offset = skb_inner_network_offset(skb);
673 txd->l4_offset = skb_inner_transport_offset(skb);
674 hdrlen = skb_inner_transport_header(skb) - skb->data +
675 inner_tcp_hdrlen(skb);
678 txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs;
679 txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1);
681 mss = skb_shinfo(skb)->gso_size & PCIE_DESC_TX_MSS_MASK;
682 txd->lso_hdrlen = hdrlen;
683 txd->mss = cpu_to_le16(mss);
684 txd->flags |= PCIE_DESC_TX_LSO;
686 u64_stats_update_begin(&r_vec->tx_sync);
688 u64_stats_update_end(&r_vec->tx_sync);
692 * nfp_net_tx_csum() - Set TX CSUM offload flags in TX descriptor
693 * @dp: NFP Net data path struct
694 * @r_vec: per-ring structure
695 * @txbuf: Pointer to driver soft TX descriptor
696 * @txd: Pointer to TX descriptor
697 * @skb: Pointer to SKB
699 * This function sets the TX checksum flags in the TX descriptor based
700 * on the configuration and the protocol of the packet to be transmitted.
702 static void nfp_net_tx_csum(struct nfp_net_dp *dp,
703 struct nfp_net_r_vector *r_vec,
704 struct nfp_net_tx_buf *txbuf,
705 struct nfp_net_tx_desc *txd, struct sk_buff *skb)
707 struct ipv6hdr *ipv6h;
711 if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
714 if (skb->ip_summed != CHECKSUM_PARTIAL)
717 txd->flags |= PCIE_DESC_TX_CSUM;
718 if (skb->encapsulation)
719 txd->flags |= PCIE_DESC_TX_ENCAP;
721 iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
722 ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
724 if (iph->version == 4) {
725 txd->flags |= PCIE_DESC_TX_IP4_CSUM;
726 l4_hdr = iph->protocol;
727 } else if (ipv6h->version == 6) {
728 l4_hdr = ipv6h->nexthdr;
730 nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
736 txd->flags |= PCIE_DESC_TX_TCP_CSUM;
739 txd->flags |= PCIE_DESC_TX_UDP_CSUM;
742 nn_dp_warn(dp, "partial checksum but l4 proto=%x!\n", l4_hdr);
746 u64_stats_update_begin(&r_vec->tx_sync);
747 if (skb->encapsulation)
748 r_vec->hw_csum_tx_inner += txbuf->pkt_cnt;
750 r_vec->hw_csum_tx += txbuf->pkt_cnt;
751 u64_stats_update_end(&r_vec->tx_sync);
754 static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
757 nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add);
758 tx_ring->wr_ptr_add = 0;
761 static int nfp_net_prep_port_id(struct sk_buff *skb)
763 struct metadata_dst *md_dst = skb_metadata_dst(skb);
768 if (unlikely(md_dst->type != METADATA_HW_PORT_MUX))
771 if (unlikely(skb_cow_head(skb, 8)))
774 data = skb_push(skb, 8);
775 put_unaligned_be32(NFP_NET_META_PORTID, data);
776 put_unaligned_be32(md_dst->u.port_info.port_id, data + 4);
782 * nfp_net_tx() - Main transmit entry point
783 * @skb: SKB to transmit
784 * @netdev: netdev structure
786 * Return: NETDEV_TX_OK on success.
788 static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
790 struct nfp_net *nn = netdev_priv(netdev);
791 const struct skb_frag_struct *frag;
792 struct nfp_net_tx_desc *txd, txdg;
793 int f, nr_frags, wr_idx, md_bytes;
794 struct nfp_net_tx_ring *tx_ring;
795 struct nfp_net_r_vector *r_vec;
796 struct nfp_net_tx_buf *txbuf;
797 struct netdev_queue *nd_q;
798 struct nfp_net_dp *dp;
804 qidx = skb_get_queue_mapping(skb);
805 tx_ring = &dp->tx_rings[qidx];
806 r_vec = tx_ring->r_vec;
807 nd_q = netdev_get_tx_queue(dp->netdev, qidx);
809 nr_frags = skb_shinfo(skb)->nr_frags;
811 if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) {
812 nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",
813 qidx, tx_ring->wr_p, tx_ring->rd_p);
814 netif_tx_stop_queue(nd_q);
815 nfp_net_tx_xmit_more_flush(tx_ring);
816 u64_stats_update_begin(&r_vec->tx_sync);
818 u64_stats_update_end(&r_vec->tx_sync);
819 return NETDEV_TX_BUSY;
822 md_bytes = nfp_net_prep_port_id(skb);
823 if (unlikely(md_bytes < 0)) {
824 nfp_net_tx_xmit_more_flush(tx_ring);
825 dev_kfree_skb_any(skb);
829 /* Start with the head skbuf */
830 dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
832 if (dma_mapping_error(dp->dev, dma_addr))
835 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
837 /* Stash the soft descriptor of the head then initialize it */
838 txbuf = &tx_ring->txbufs[wr_idx];
840 txbuf->dma_addr = dma_addr;
843 txbuf->real_len = skb->len;
845 /* Build TX descriptor */
846 txd = &tx_ring->txds[wr_idx];
847 txd->offset_eop = (nr_frags ? 0 : PCIE_DESC_TX_EOP) | md_bytes;
848 txd->dma_len = cpu_to_le16(skb_headlen(skb));
849 nfp_desc_set_dma_addr(txd, dma_addr);
850 txd->data_len = cpu_to_le16(skb->len);
856 /* Do not reorder - tso may adjust pkt cnt, vlan may override fields */
857 nfp_net_tx_tso(r_vec, txbuf, txd, skb);
858 nfp_net_tx_csum(dp, r_vec, txbuf, txd, skb);
859 if (skb_vlan_tag_present(skb) && dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN) {
860 txd->flags |= PCIE_DESC_TX_VLAN;
861 txd->vlan = cpu_to_le16(skb_vlan_tag_get(skb));
866 /* all descs must match except for in addr, length and eop */
869 for (f = 0; f < nr_frags; f++) {
870 frag = &skb_shinfo(skb)->frags[f];
871 fsize = skb_frag_size(frag);
873 dma_addr = skb_frag_dma_map(dp->dev, frag, 0,
874 fsize, DMA_TO_DEVICE);
875 if (dma_mapping_error(dp->dev, dma_addr))
878 wr_idx = D_IDX(tx_ring, wr_idx + 1);
879 tx_ring->txbufs[wr_idx].skb = skb;
880 tx_ring->txbufs[wr_idx].dma_addr = dma_addr;
881 tx_ring->txbufs[wr_idx].fidx = f;
883 txd = &tx_ring->txds[wr_idx];
885 txd->dma_len = cpu_to_le16(fsize);
886 nfp_desc_set_dma_addr(txd, dma_addr);
888 (f == nr_frags - 1) ? PCIE_DESC_TX_EOP : 0;
891 u64_stats_update_begin(&r_vec->tx_sync);
893 u64_stats_update_end(&r_vec->tx_sync);
896 netdev_tx_sent_queue(nd_q, txbuf->real_len);
898 tx_ring->wr_p += nr_frags + 1;
899 if (nfp_net_tx_ring_should_stop(tx_ring))
900 nfp_net_tx_ring_stop(nd_q, tx_ring);
902 tx_ring->wr_ptr_add += nr_frags + 1;
903 if (!skb->xmit_more || netif_xmit_stopped(nd_q))
904 nfp_net_tx_xmit_more_flush(tx_ring);
906 skb_tx_timestamp(skb);
913 frag = &skb_shinfo(skb)->frags[f];
914 dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
915 skb_frag_size(frag), DMA_TO_DEVICE);
916 tx_ring->txbufs[wr_idx].skb = NULL;
917 tx_ring->txbufs[wr_idx].dma_addr = 0;
918 tx_ring->txbufs[wr_idx].fidx = -2;
921 wr_idx += tx_ring->cnt;
923 dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
924 skb_headlen(skb), DMA_TO_DEVICE);
925 tx_ring->txbufs[wr_idx].skb = NULL;
926 tx_ring->txbufs[wr_idx].dma_addr = 0;
927 tx_ring->txbufs[wr_idx].fidx = -2;
929 nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
930 nfp_net_tx_xmit_more_flush(tx_ring);
931 u64_stats_update_begin(&r_vec->tx_sync);
933 u64_stats_update_end(&r_vec->tx_sync);
934 dev_kfree_skb_any(skb);
939 * nfp_net_tx_complete() - Handled completed TX packets
940 * @tx_ring: TX ring structure
942 * Return: Number of completed TX descriptors
944 static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
946 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
947 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
948 const struct skb_frag_struct *frag;
949 struct netdev_queue *nd_q;
950 u32 done_pkts = 0, done_bytes = 0;
957 if (tx_ring->wr_p == tx_ring->rd_p)
960 /* Work out how many descriptors have been transmitted */
961 qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
963 if (qcp_rd_p == tx_ring->qcp_rd_p)
966 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
969 idx = D_IDX(tx_ring, tx_ring->rd_p++);
971 skb = tx_ring->txbufs[idx].skb;
975 nr_frags = skb_shinfo(skb)->nr_frags;
976 fidx = tx_ring->txbufs[idx].fidx;
980 dma_unmap_single(dp->dev, tx_ring->txbufs[idx].dma_addr,
981 skb_headlen(skb), DMA_TO_DEVICE);
983 done_pkts += tx_ring->txbufs[idx].pkt_cnt;
984 done_bytes += tx_ring->txbufs[idx].real_len;
987 frag = &skb_shinfo(skb)->frags[fidx];
988 dma_unmap_page(dp->dev, tx_ring->txbufs[idx].dma_addr,
989 skb_frag_size(frag), DMA_TO_DEVICE);
992 /* check for last gather fragment */
993 if (fidx == nr_frags - 1)
994 dev_kfree_skb_any(skb);
996 tx_ring->txbufs[idx].dma_addr = 0;
997 tx_ring->txbufs[idx].skb = NULL;
998 tx_ring->txbufs[idx].fidx = -2;
1001 tx_ring->qcp_rd_p = qcp_rd_p;
1003 u64_stats_update_begin(&r_vec->tx_sync);
1004 r_vec->tx_bytes += done_bytes;
1005 r_vec->tx_pkts += done_pkts;
1006 u64_stats_update_end(&r_vec->tx_sync);
1011 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
1012 netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
1013 if (nfp_net_tx_ring_should_wake(tx_ring)) {
1014 /* Make sure TX thread will see updated tx_ring->rd_p */
1017 if (unlikely(netif_tx_queue_stopped(nd_q)))
1018 netif_tx_wake_queue(nd_q);
1021 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
1022 "TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
1023 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
1026 static bool nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring)
1028 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
1029 u32 done_pkts = 0, done_bytes = 0;
1034 /* Work out how many descriptors have been transmitted */
1035 qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
1037 if (qcp_rd_p == tx_ring->qcp_rd_p)
1040 todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
1042 done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
1043 todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
1045 tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + todo);
1049 idx = D_IDX(tx_ring, tx_ring->rd_p);
1052 done_bytes += tx_ring->txbufs[idx].real_len;
1055 u64_stats_update_begin(&r_vec->tx_sync);
1056 r_vec->tx_bytes += done_bytes;
1057 r_vec->tx_pkts += done_pkts;
1058 u64_stats_update_end(&r_vec->tx_sync);
1060 WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
1061 "XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
1062 tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
1068 * nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers
1069 * @dp: NFP Net data path struct
1070 * @tx_ring: TX ring structure
1072 * Assumes that the device is stopped
1075 nfp_net_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
1077 const struct skb_frag_struct *frag;
1078 struct netdev_queue *nd_q;
1080 while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) {
1081 struct nfp_net_tx_buf *tx_buf;
1082 struct sk_buff *skb;
1085 idx = D_IDX(tx_ring, tx_ring->rd_p);
1086 tx_buf = &tx_ring->txbufs[idx];
1088 skb = tx_ring->txbufs[idx].skb;
1089 nr_frags = skb_shinfo(skb)->nr_frags;
1091 if (tx_buf->fidx == -1) {
1093 dma_unmap_single(dp->dev, tx_buf->dma_addr,
1094 skb_headlen(skb), DMA_TO_DEVICE);
1096 /* unmap fragment */
1097 frag = &skb_shinfo(skb)->frags[tx_buf->fidx];
1098 dma_unmap_page(dp->dev, tx_buf->dma_addr,
1099 skb_frag_size(frag), DMA_TO_DEVICE);
1102 /* check for last gather fragment */
1103 if (tx_buf->fidx == nr_frags - 1)
1104 dev_kfree_skb_any(skb);
1106 tx_buf->dma_addr = 0;
1110 tx_ring->qcp_rd_p++;
1114 memset(tx_ring->txds, 0, sizeof(*tx_ring->txds) * tx_ring->cnt);
1117 tx_ring->qcp_rd_p = 0;
1118 tx_ring->wr_ptr_add = 0;
1120 if (tx_ring->is_xdp || !dp->netdev)
1123 nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
1124 netdev_tx_reset_queue(nd_q);
1127 static void nfp_net_tx_timeout(struct net_device *netdev)
1129 struct nfp_net *nn = netdev_priv(netdev);
1132 for (i = 0; i < nn->dp.netdev->real_num_tx_queues; i++) {
1133 if (!netif_tx_queue_stopped(netdev_get_tx_queue(netdev, i)))
1135 nn_warn(nn, "TX timeout on ring: %d\n", i);
1137 nn_warn(nn, "TX watchdog timeout\n");
1140 /* Receive processing
1143 nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp)
1145 unsigned int fl_bufsz;
1147 fl_bufsz = NFP_NET_RX_BUF_HEADROOM;
1148 fl_bufsz += dp->rx_dma_off;
1149 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1150 fl_bufsz += NFP_NET_MAX_PREPEND;
1152 fl_bufsz += dp->rx_offset;
1153 fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu;
1155 fl_bufsz = SKB_DATA_ALIGN(fl_bufsz);
1156 fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1162 nfp_net_free_frag(void *frag, bool xdp)
1165 skb_free_frag(frag);
1167 __free_page(virt_to_page(frag));
1171 * nfp_net_rx_alloc_one() - Allocate and map page frag for RX
1172 * @dp: NFP Net data path struct
1173 * @dma_addr: Pointer to storage for DMA address (output param)
1175 * This function will allcate a new page frag, map it for DMA.
1177 * Return: allocated page frag or NULL on failure.
1179 static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
1184 frag = netdev_alloc_frag(dp->fl_bufsz);
1186 frag = page_address(alloc_page(GFP_KERNEL | __GFP_COLD));
1188 nn_dp_warn(dp, "Failed to alloc receive page frag\n");
1192 *dma_addr = nfp_net_dma_map_rx(dp, frag);
1193 if (dma_mapping_error(dp->dev, *dma_addr)) {
1194 nfp_net_free_frag(frag, dp->xdp_prog);
1195 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
1202 static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
1207 frag = napi_alloc_frag(dp->fl_bufsz);
1209 frag = page_address(alloc_page(GFP_ATOMIC | __GFP_COLD));
1211 nn_dp_warn(dp, "Failed to alloc receive page frag\n");
1215 *dma_addr = nfp_net_dma_map_rx(dp, frag);
1216 if (dma_mapping_error(dp->dev, *dma_addr)) {
1217 nfp_net_free_frag(frag, dp->xdp_prog);
1218 nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
1226 * nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings
1227 * @dp: NFP Net data path struct
1228 * @rx_ring: RX ring structure
1229 * @frag: page fragment buffer
1230 * @dma_addr: DMA address of skb mapping
1232 static void nfp_net_rx_give_one(const struct nfp_net_dp *dp,
1233 struct nfp_net_rx_ring *rx_ring,
1234 void *frag, dma_addr_t dma_addr)
1236 unsigned int wr_idx;
1238 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
1240 nfp_net_dma_sync_dev_rx(dp, dma_addr);
1242 /* Stash SKB and DMA address away */
1243 rx_ring->rxbufs[wr_idx].frag = frag;
1244 rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
1246 /* Fill freelist descriptor */
1247 rx_ring->rxds[wr_idx].fld.reserved = 0;
1248 rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
1249 nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld,
1250 dma_addr + dp->rx_dma_off);
1253 if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {
1254 /* Update write pointer of the freelist queue. Make
1255 * sure all writes are flushed before telling the hardware.
1258 nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);
1263 * nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable
1264 * @rx_ring: RX ring structure
1266 * Warning: Do *not* call if ring buffers were never put on the FW freelist
1267 * (i.e. device was not enabled)!
1269 static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
1271 unsigned int wr_idx, last_idx;
1273 /* Move the empty entry to the end of the list */
1274 wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
1275 last_idx = rx_ring->cnt - 1;
1276 rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr;
1277 rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag;
1278 rx_ring->rxbufs[last_idx].dma_addr = 0;
1279 rx_ring->rxbufs[last_idx].frag = NULL;
1281 memset(rx_ring->rxds, 0, sizeof(*rx_ring->rxds) * rx_ring->cnt);
1287 * nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring
1288 * @dp: NFP Net data path struct
1289 * @rx_ring: RX ring to remove buffers from
1291 * Assumes that the device is stopped and buffers are in [0, ring->cnt - 1)
1292 * entries. After device is disabled nfp_net_rx_ring_reset() must be called
1293 * to restore required ring geometry.
1296 nfp_net_rx_ring_bufs_free(struct nfp_net_dp *dp,
1297 struct nfp_net_rx_ring *rx_ring)
1301 for (i = 0; i < rx_ring->cnt - 1; i++) {
1302 /* NULL skb can only happen when initial filling of the ring
1303 * fails to allocate enough buffers and calls here to free
1304 * already allocated ones.
1306 if (!rx_ring->rxbufs[i].frag)
1309 nfp_net_dma_unmap_rx(dp, rx_ring->rxbufs[i].dma_addr);
1310 nfp_net_free_frag(rx_ring->rxbufs[i].frag, dp->xdp_prog);
1311 rx_ring->rxbufs[i].dma_addr = 0;
1312 rx_ring->rxbufs[i].frag = NULL;
1317 * nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW)
1318 * @dp: NFP Net data path struct
1319 * @rx_ring: RX ring to remove buffers from
1322 nfp_net_rx_ring_bufs_alloc(struct nfp_net_dp *dp,
1323 struct nfp_net_rx_ring *rx_ring)
1325 struct nfp_net_rx_buf *rxbufs;
1328 rxbufs = rx_ring->rxbufs;
1330 for (i = 0; i < rx_ring->cnt - 1; i++) {
1331 rxbufs[i].frag = nfp_net_rx_alloc_one(dp, &rxbufs[i].dma_addr);
1332 if (!rxbufs[i].frag) {
1333 nfp_net_rx_ring_bufs_free(dp, rx_ring);
1342 * nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW
1343 * @dp: NFP Net data path struct
1344 * @rx_ring: RX ring to fill
1347 nfp_net_rx_ring_fill_freelist(struct nfp_net_dp *dp,
1348 struct nfp_net_rx_ring *rx_ring)
1352 for (i = 0; i < rx_ring->cnt - 1; i++)
1353 nfp_net_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
1354 rx_ring->rxbufs[i].dma_addr);
1358 * nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors
1359 * @flags: RX descriptor flags field in CPU byte order
1361 static int nfp_net_rx_csum_has_errors(u16 flags)
1363 u16 csum_all_checked, csum_all_ok;
1365 csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
1366 csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
1368 return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
1372 * nfp_net_rx_csum() - set SKB checksum field based on RX descriptor flags
1373 * @dp: NFP Net data path struct
1374 * @r_vec: per-ring structure
1375 * @rxd: Pointer to RX descriptor
1376 * @meta: Parsed metadata prepend
1377 * @skb: Pointer to SKB
1379 static void nfp_net_rx_csum(struct nfp_net_dp *dp,
1380 struct nfp_net_r_vector *r_vec,
1381 struct nfp_net_rx_desc *rxd,
1382 struct nfp_meta_parsed *meta, struct sk_buff *skb)
1384 skb_checksum_none_assert(skb);
1386 if (!(dp->netdev->features & NETIF_F_RXCSUM))
1389 if (meta->csum_type) {
1390 skb->ip_summed = meta->csum_type;
1391 skb->csum = meta->csum;
1392 u64_stats_update_begin(&r_vec->rx_sync);
1393 r_vec->hw_csum_rx_ok++;
1394 u64_stats_update_end(&r_vec->rx_sync);
1398 if (nfp_net_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
1399 u64_stats_update_begin(&r_vec->rx_sync);
1400 r_vec->hw_csum_rx_error++;
1401 u64_stats_update_end(&r_vec->rx_sync);
1405 /* Assume that the firmware will never report inner CSUM_OK unless outer
1406 * L4 headers were successfully parsed. FW will always report zero UDP
1407 * checksum as CSUM_OK.
1409 if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
1410 rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
1411 __skb_incr_checksum_unnecessary(skb);
1412 u64_stats_update_begin(&r_vec->rx_sync);
1413 r_vec->hw_csum_rx_ok++;
1414 u64_stats_update_end(&r_vec->rx_sync);
1417 if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
1418 rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
1419 __skb_incr_checksum_unnecessary(skb);
1420 u64_stats_update_begin(&r_vec->rx_sync);
1421 r_vec->hw_csum_rx_inner_ok++;
1422 u64_stats_update_end(&r_vec->rx_sync);
1427 nfp_net_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,
1428 unsigned int type, __be32 *hash)
1430 if (!(netdev->features & NETIF_F_RXHASH))
1434 case NFP_NET_RSS_IPV4:
1435 case NFP_NET_RSS_IPV6:
1436 case NFP_NET_RSS_IPV6_EX:
1437 meta->hash_type = PKT_HASH_TYPE_L3;
1440 meta->hash_type = PKT_HASH_TYPE_L4;
1444 meta->hash = get_unaligned_be32(hash);
1448 nfp_net_set_hash_desc(struct net_device *netdev, struct nfp_meta_parsed *meta,
1449 void *data, struct nfp_net_rx_desc *rxd)
1451 struct nfp_net_rx_hash *rx_hash = data;
1453 if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
1456 nfp_net_set_hash(netdev, meta, get_unaligned_be32(&rx_hash->hash_type),
1461 nfp_net_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
1462 void *data, int meta_len)
1466 meta_info = get_unaligned_be32(data);
1470 switch (meta_info & NFP_NET_META_FIELD_MASK) {
1471 case NFP_NET_META_HASH:
1472 meta_info >>= NFP_NET_META_FIELD_SIZE;
1473 nfp_net_set_hash(netdev, meta,
1474 meta_info & NFP_NET_META_FIELD_MASK,
1478 case NFP_NET_META_MARK:
1479 meta->mark = get_unaligned_be32(data);
1482 case NFP_NET_META_PORTID:
1483 meta->portid = get_unaligned_be32(data);
1486 case NFP_NET_META_CSUM:
1487 meta->csum_type = CHECKSUM_COMPLETE;
1489 (__force __wsum)__get_unaligned_cpu32(data);
1496 meta_info >>= NFP_NET_META_FIELD_SIZE;
1503 nfp_net_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
1504 struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
1505 struct sk_buff *skb)
1507 u64_stats_update_begin(&r_vec->rx_sync);
1509 u64_stats_update_end(&r_vec->rx_sync);
1511 /* skb is build based on the frag, free_skb() would free the frag
1512 * so to be able to reuse it we need an extra ref.
1514 if (skb && rxbuf && skb->head == rxbuf->frag)
1515 page_ref_inc(virt_to_head_page(rxbuf->frag));
1517 nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
1519 dev_kfree_skb_any(skb);
1523 nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
1524 struct nfp_net_tx_ring *tx_ring,
1525 struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
1526 unsigned int pkt_len, bool *completed)
1528 struct nfp_net_tx_buf *txbuf;
1529 struct nfp_net_tx_desc *txd;
1532 if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
1534 nfp_net_xdp_complete(tx_ring);
1538 if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
1539 nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
1545 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
1547 /* Stash the soft descriptor of the head then initialize it */
1548 txbuf = &tx_ring->txbufs[wr_idx];
1550 nfp_net_rx_give_one(dp, rx_ring, txbuf->frag, txbuf->dma_addr);
1552 txbuf->frag = rxbuf->frag;
1553 txbuf->dma_addr = rxbuf->dma_addr;
1556 txbuf->real_len = pkt_len;
1558 dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
1559 pkt_len, DMA_BIDIRECTIONAL);
1561 /* Build TX descriptor */
1562 txd = &tx_ring->txds[wr_idx];
1563 txd->offset_eop = PCIE_DESC_TX_EOP;
1564 txd->dma_len = cpu_to_le16(pkt_len);
1565 nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off);
1566 txd->data_len = cpu_to_le16(pkt_len);
1570 txd->lso_hdrlen = 0;
1573 tx_ring->wr_ptr_add++;
1577 static int nfp_net_run_xdp(struct bpf_prog *prog, void *data, void *hard_start,
1578 unsigned int *off, unsigned int *len)
1580 struct xdp_buff xdp;
1584 xdp.data_hard_start = hard_start;
1585 xdp.data = data + *off;
1586 xdp.data_end = data + *off + *len;
1588 orig_data = xdp.data;
1589 ret = bpf_prog_run_xdp(prog, &xdp);
1591 *len -= xdp.data - orig_data;
1592 *off += xdp.data - orig_data;
1598 * nfp_net_rx() - receive up to @budget packets on @rx_ring
1599 * @rx_ring: RX ring to receive from
1600 * @budget: NAPI budget
1602 * Note, this function is separated out from the napi poll function to
1603 * more cleanly separate packet receive code from other bookkeeping
1604 * functions performed in the napi poll function.
1606 * Return: Number of packets received.
1608 static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
1610 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
1611 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
1612 struct nfp_net_tx_ring *tx_ring;
1613 struct bpf_prog *xdp_prog;
1614 bool xdp_tx_cmpl = false;
1615 unsigned int true_bufsz;
1616 struct sk_buff *skb;
1617 int pkts_polled = 0;
1621 xdp_prog = READ_ONCE(dp->xdp_prog);
1622 true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
1623 tx_ring = r_vec->xdp_ring;
1625 while (pkts_polled < budget) {
1626 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1627 struct nfp_net_rx_buf *rxbuf;
1628 struct nfp_net_rx_desc *rxd;
1629 struct nfp_meta_parsed meta;
1630 struct net_device *netdev;
1631 dma_addr_t new_dma_addr;
1634 idx = D_IDX(rx_ring, rx_ring->rd_p);
1636 rxd = &rx_ring->rxds[idx];
1637 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1640 /* Memory barrier to ensure that we won't do other reads
1641 * before the DD bit.
1645 memset(&meta, 0, sizeof(meta));
1650 rxbuf = &rx_ring->rxbufs[idx];
1652 * <-- [rx_offset] -->
1653 * ---------------------------------------------------------
1654 * | [XX] | metadata | packet | XXXX |
1655 * ---------------------------------------------------------
1656 * <---------------- data_len --------------->
1658 * The rx_offset is fixed for all packets, the meta_len can vary
1659 * on a packet by packet basis. If rx_offset is set to zero
1660 * (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
1661 * buffer and is immediately followed by the packet (no [XX]).
1663 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1664 data_len = le16_to_cpu(rxd->rxd.data_len);
1665 pkt_len = data_len - meta_len;
1667 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1668 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1669 pkt_off += meta_len;
1671 pkt_off += dp->rx_offset;
1672 meta_off = pkt_off - meta_len;
1675 u64_stats_update_begin(&r_vec->rx_sync);
1677 r_vec->rx_bytes += pkt_len;
1678 u64_stats_update_end(&r_vec->rx_sync);
1680 if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
1681 (dp->rx_offset && meta_len > dp->rx_offset))) {
1682 nn_dp_warn(dp, "oversized RX packet metadata %u\n",
1684 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1688 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,
1691 if (!dp->chained_metadata_format) {
1692 nfp_net_set_hash_desc(dp->netdev, &meta,
1693 rxbuf->frag + meta_off, rxd);
1694 } else if (meta_len) {
1697 end = nfp_net_parse_meta(dp->netdev, &meta,
1698 rxbuf->frag + meta_off,
1700 if (unlikely(end != rxbuf->frag + pkt_off)) {
1701 nn_dp_warn(dp, "invalid RX packet metadata\n");
1702 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf,
1708 if (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF &&
1709 dp->bpf_offload_xdp) && !meta.portid) {
1710 unsigned int dma_off;
1714 hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM;
1716 act = nfp_net_run_xdp(xdp_prog, rxbuf->frag, hard_start,
1717 &pkt_off, &pkt_len);
1722 dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
1723 if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring,
1728 trace_xdp_exception(dp->netdev,
1732 bpf_warn_invalid_xdp_action(act);
1735 trace_xdp_exception(dp->netdev, xdp_prog, act);
1738 nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag,
1744 skb = build_skb(rxbuf->frag, true_bufsz);
1745 if (unlikely(!skb)) {
1746 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
1749 new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
1750 if (unlikely(!new_frag)) {
1751 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1755 if (likely(!meta.portid)) {
1756 netdev = dp->netdev;
1760 nn = netdev_priv(dp->netdev);
1761 netdev = nfp_app_repr_get(nn->app, meta.portid);
1762 if (unlikely(!netdev)) {
1763 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
1766 nfp_repr_inc_rx_stats(netdev, pkt_len);
1769 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
1771 nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
1773 skb_reserve(skb, pkt_off);
1774 skb_put(skb, pkt_len);
1776 skb->mark = meta.mark;
1777 skb_set_hash(skb, meta.hash, meta.hash_type);
1779 skb_record_rx_queue(skb, rx_ring->idx);
1780 skb->protocol = eth_type_trans(skb, netdev);
1782 nfp_net_rx_csum(dp, r_vec, rxd, &meta, skb);
1784 if (rxd->rxd.flags & PCIE_DESC_RX_VLAN)
1785 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
1786 le16_to_cpu(rxd->rxd.vlan));
1788 napi_gro_receive(&rx_ring->r_vec->napi, skb);
1792 if (tx_ring->wr_ptr_add)
1793 nfp_net_tx_xmit_more_flush(tx_ring);
1794 else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&
1796 if (!nfp_net_xdp_complete(tx_ring))
1797 pkts_polled = budget;
1805 * nfp_net_poll() - napi poll function
1806 * @napi: NAPI structure
1807 * @budget: NAPI budget
1809 * Return: number of packets polled.
1811 static int nfp_net_poll(struct napi_struct *napi, int budget)
1813 struct nfp_net_r_vector *r_vec =
1814 container_of(napi, struct nfp_net_r_vector, napi);
1815 unsigned int pkts_polled = 0;
1818 nfp_net_tx_complete(r_vec->tx_ring);
1820 pkts_polled = nfp_net_rx(r_vec->rx_ring, budget);
1822 if (pkts_polled < budget)
1823 if (napi_complete_done(napi, pkts_polled))
1824 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
1829 /* Control device data path
1833 nfp_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
1834 struct sk_buff *skb, bool old)
1836 unsigned int real_len = skb->len, meta_len = 0;
1837 struct nfp_net_tx_ring *tx_ring;
1838 struct nfp_net_tx_buf *txbuf;
1839 struct nfp_net_tx_desc *txd;
1840 struct nfp_net_dp *dp;
1841 dma_addr_t dma_addr;
1844 dp = &r_vec->nfp_net->dp;
1845 tx_ring = r_vec->tx_ring;
1847 if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {
1848 nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");
1852 if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
1853 u64_stats_update_begin(&r_vec->tx_sync);
1855 u64_stats_update_end(&r_vec->tx_sync);
1857 __skb_queue_tail(&r_vec->queue, skb);
1859 __skb_queue_head(&r_vec->queue, skb);
1863 if (nfp_app_ctrl_has_meta(nn->app)) {
1864 if (unlikely(skb_headroom(skb) < 8)) {
1865 nn_dp_warn(dp, "CTRL TX on skb without headroom\n");
1869 put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
1870 put_unaligned_be32(NFP_NET_META_PORTID, skb_push(skb, 4));
1873 /* Start with the head skbuf */
1874 dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
1876 if (dma_mapping_error(dp->dev, dma_addr))
1879 wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
1881 /* Stash the soft descriptor of the head then initialize it */
1882 txbuf = &tx_ring->txbufs[wr_idx];
1884 txbuf->dma_addr = dma_addr;
1887 txbuf->real_len = real_len;
1889 /* Build TX descriptor */
1890 txd = &tx_ring->txds[wr_idx];
1891 txd->offset_eop = meta_len | PCIE_DESC_TX_EOP;
1892 txd->dma_len = cpu_to_le16(skb_headlen(skb));
1893 nfp_desc_set_dma_addr(txd, dma_addr);
1894 txd->data_len = cpu_to_le16(skb->len);
1898 txd->lso_hdrlen = 0;
1901 tx_ring->wr_ptr_add++;
1902 nfp_net_tx_xmit_more_flush(tx_ring);
1907 nn_dp_warn(dp, "Failed to DMA map TX CTRL buffer\n");
1909 u64_stats_update_begin(&r_vec->tx_sync);
1911 u64_stats_update_end(&r_vec->tx_sync);
1912 dev_kfree_skb_any(skb);
1916 bool nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb)
1918 struct nfp_net_r_vector *r_vec = &nn->r_vecs[0];
1921 spin_lock_bh(&r_vec->lock);
1922 ret = nfp_ctrl_tx_one(nn, r_vec, skb, false);
1923 spin_unlock_bh(&r_vec->lock);
1928 static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)
1930 struct sk_buff *skb;
1932 while ((skb = __skb_dequeue(&r_vec->queue)))
1933 if (nfp_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))
1938 nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)
1940 u32 meta_type, meta_tag;
1942 if (!nfp_app_ctrl_has_meta(nn->app))
1948 meta_type = get_unaligned_be32(data);
1949 meta_tag = get_unaligned_be32(data + 4);
1951 return (meta_type == NFP_NET_META_PORTID &&
1952 meta_tag == NFP_META_PORT_ID_CTRL);
1956 nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,
1957 struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)
1959 unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
1960 struct nfp_net_rx_buf *rxbuf;
1961 struct nfp_net_rx_desc *rxd;
1962 dma_addr_t new_dma_addr;
1963 struct sk_buff *skb;
1967 idx = D_IDX(rx_ring, rx_ring->rd_p);
1969 rxd = &rx_ring->rxds[idx];
1970 if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
1973 /* Memory barrier to ensure that we won't do other reads
1974 * before the DD bit.
1980 rxbuf = &rx_ring->rxbufs[idx];
1981 meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
1982 data_len = le16_to_cpu(rxd->rxd.data_len);
1983 pkt_len = data_len - meta_len;
1985 pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
1986 if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
1987 pkt_off += meta_len;
1989 pkt_off += dp->rx_offset;
1990 meta_off = pkt_off - meta_len;
1993 u64_stats_update_begin(&r_vec->rx_sync);
1995 r_vec->rx_bytes += pkt_len;
1996 u64_stats_update_end(&r_vec->rx_sync);
1998 nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);
2000 if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {
2001 nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",
2003 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
2007 skb = build_skb(rxbuf->frag, dp->fl_bufsz);
2008 if (unlikely(!skb)) {
2009 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
2012 new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
2013 if (unlikely(!new_frag)) {
2014 nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
2018 nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
2020 nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
2022 skb_reserve(skb, pkt_off);
2023 skb_put(skb, pkt_len);
2025 nfp_app_ctrl_rx(nn->app, skb);
2030 static void nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)
2032 struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;
2033 struct nfp_net *nn = r_vec->nfp_net;
2034 struct nfp_net_dp *dp = &nn->dp;
2036 while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring))
2040 static void nfp_ctrl_poll(unsigned long arg)
2042 struct nfp_net_r_vector *r_vec = (void *)arg;
2044 spin_lock_bh(&r_vec->lock);
2045 nfp_net_tx_complete(r_vec->tx_ring);
2046 __nfp_ctrl_tx_queued(r_vec);
2047 spin_unlock_bh(&r_vec->lock);
2051 nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
2054 /* Setup and Configuration
2058 * nfp_net_vecs_init() - Assign IRQs and setup rvecs.
2059 * @nn: NFP Network structure
2061 static void nfp_net_vecs_init(struct nfp_net *nn)
2063 struct nfp_net_r_vector *r_vec;
2066 nn->lsc_handler = nfp_net_irq_lsc;
2067 nn->exn_handler = nfp_net_irq_exn;
2069 for (r = 0; r < nn->max_r_vecs; r++) {
2070 struct msix_entry *entry;
2072 entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r];
2074 r_vec = &nn->r_vecs[r];
2075 r_vec->nfp_net = nn;
2076 r_vec->irq_entry = entry->entry;
2077 r_vec->irq_vector = entry->vector;
2079 if (nn->dp.netdev) {
2080 r_vec->handler = nfp_net_irq_rxtx;
2082 r_vec->handler = nfp_ctrl_irq_rxtx;
2084 __skb_queue_head_init(&r_vec->queue);
2085 spin_lock_init(&r_vec->lock);
2086 tasklet_init(&r_vec->tasklet, nfp_ctrl_poll,
2087 (unsigned long)r_vec);
2088 tasklet_disable(&r_vec->tasklet);
2091 cpumask_set_cpu(r, &r_vec->affinity_mask);
2096 * nfp_net_tx_ring_free() - Free resources allocated to a TX ring
2097 * @tx_ring: TX ring to free
2099 static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
2101 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
2102 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
2104 kfree(tx_ring->txbufs);
2107 dma_free_coherent(dp->dev, tx_ring->size,
2108 tx_ring->txds, tx_ring->dma);
2111 tx_ring->txbufs = NULL;
2112 tx_ring->txds = NULL;
2118 * nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
2119 * @dp: NFP Net data path struct
2120 * @tx_ring: TX Ring structure to allocate
2122 * Return: 0 on success, negative errno otherwise.
2125 nfp_net_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
2127 struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
2130 tx_ring->cnt = dp->txd_cnt;
2132 tx_ring->size = sizeof(*tx_ring->txds) * tx_ring->cnt;
2133 tx_ring->txds = dma_zalloc_coherent(dp->dev, tx_ring->size,
2134 &tx_ring->dma, GFP_KERNEL);
2138 sz = sizeof(*tx_ring->txbufs) * tx_ring->cnt;
2139 tx_ring->txbufs = kzalloc(sz, GFP_KERNEL);
2140 if (!tx_ring->txbufs)
2143 if (!tx_ring->is_xdp && dp->netdev)
2144 netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask,
2150 nfp_net_tx_ring_free(tx_ring);
2155 nfp_net_tx_ring_bufs_free(struct nfp_net_dp *dp,
2156 struct nfp_net_tx_ring *tx_ring)
2160 if (!tx_ring->is_xdp)
2163 for (i = 0; i < tx_ring->cnt; i++) {
2164 if (!tx_ring->txbufs[i].frag)
2167 nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[i].dma_addr);
2168 __free_page(virt_to_page(tx_ring->txbufs[i].frag));
2173 nfp_net_tx_ring_bufs_alloc(struct nfp_net_dp *dp,
2174 struct nfp_net_tx_ring *tx_ring)
2176 struct nfp_net_tx_buf *txbufs = tx_ring->txbufs;
2179 if (!tx_ring->is_xdp)
2182 for (i = 0; i < tx_ring->cnt; i++) {
2183 txbufs[i].frag = nfp_net_rx_alloc_one(dp, &txbufs[i].dma_addr);
2184 if (!txbufs[i].frag) {
2185 nfp_net_tx_ring_bufs_free(dp, tx_ring);
2193 static int nfp_net_tx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
2197 dp->tx_rings = kcalloc(dp->num_tx_rings, sizeof(*dp->tx_rings),
2202 for (r = 0; r < dp->num_tx_rings; r++) {
2205 if (r >= dp->num_stack_tx_rings)
2206 bias = dp->num_stack_tx_rings;
2208 nfp_net_tx_ring_init(&dp->tx_rings[r], &nn->r_vecs[r - bias],
2211 if (nfp_net_tx_ring_alloc(dp, &dp->tx_rings[r]))
2214 if (nfp_net_tx_ring_bufs_alloc(dp, &dp->tx_rings[r]))
2222 nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]);
2224 nfp_net_tx_ring_free(&dp->tx_rings[r]);
2226 kfree(dp->tx_rings);
2230 static void nfp_net_tx_rings_free(struct nfp_net_dp *dp)
2234 for (r = 0; r < dp->num_tx_rings; r++) {
2235 nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]);
2236 nfp_net_tx_ring_free(&dp->tx_rings[r]);
2239 kfree(dp->tx_rings);
2243 * nfp_net_rx_ring_free() - Free resources allocated to a RX ring
2244 * @rx_ring: RX ring to free
2246 static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
2248 struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
2249 struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
2251 kfree(rx_ring->rxbufs);
2254 dma_free_coherent(dp->dev, rx_ring->size,
2255 rx_ring->rxds, rx_ring->dma);
2258 rx_ring->rxbufs = NULL;
2259 rx_ring->rxds = NULL;
2265 * nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
2266 * @dp: NFP Net data path struct
2267 * @rx_ring: RX ring to allocate
2269 * Return: 0 on success, negative errno otherwise.
2272 nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring)
2276 rx_ring->cnt = dp->rxd_cnt;
2277 rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
2278 rx_ring->rxds = dma_zalloc_coherent(dp->dev, rx_ring->size,
2279 &rx_ring->dma, GFP_KERNEL);
2283 sz = sizeof(*rx_ring->rxbufs) * rx_ring->cnt;
2284 rx_ring->rxbufs = kzalloc(sz, GFP_KERNEL);
2285 if (!rx_ring->rxbufs)
2291 nfp_net_rx_ring_free(rx_ring);
2295 static int nfp_net_rx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
2299 dp->rx_rings = kcalloc(dp->num_rx_rings, sizeof(*dp->rx_rings),
2304 for (r = 0; r < dp->num_rx_rings; r++) {
2305 nfp_net_rx_ring_init(&dp->rx_rings[r], &nn->r_vecs[r], r);
2307 if (nfp_net_rx_ring_alloc(dp, &dp->rx_rings[r]))
2310 if (nfp_net_rx_ring_bufs_alloc(dp, &dp->rx_rings[r]))
2318 nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
2320 nfp_net_rx_ring_free(&dp->rx_rings[r]);
2322 kfree(dp->rx_rings);
2326 static void nfp_net_rx_rings_free(struct nfp_net_dp *dp)
2330 for (r = 0; r < dp->num_rx_rings; r++) {
2331 nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
2332 nfp_net_rx_ring_free(&dp->rx_rings[r]);
2335 kfree(dp->rx_rings);
2339 nfp_net_vector_assign_rings(struct nfp_net_dp *dp,
2340 struct nfp_net_r_vector *r_vec, int idx)
2342 r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL;
2344 idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL;
2346 r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ?
2347 &dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL;
2351 nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
2358 netif_napi_add(nn->dp.netdev, &r_vec->napi,
2359 nfp_net_poll, NAPI_POLL_WEIGHT);
2361 tasklet_enable(&r_vec->tasklet);
2363 snprintf(r_vec->name, sizeof(r_vec->name),
2364 "%s-rxtx-%d", nfp_net_name(nn), idx);
2365 err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name,
2369 netif_napi_del(&r_vec->napi);
2371 tasklet_disable(&r_vec->tasklet);
2373 nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector);
2376 disable_irq(r_vec->irq_vector);
2378 irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);
2380 nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector,
2387 nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
2389 irq_set_affinity_hint(r_vec->irq_vector, NULL);
2391 netif_napi_del(&r_vec->napi);
2393 tasklet_disable(&r_vec->tasklet);
2395 free_irq(r_vec->irq_vector, r_vec);
2399 * nfp_net_rss_write_itbl() - Write RSS indirection table to device
2400 * @nn: NFP Net device to reconfigure
2402 void nfp_net_rss_write_itbl(struct nfp_net *nn)
2406 for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4)
2407 nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i,
2408 get_unaligned_le32(nn->rss_itbl + i));
2412 * nfp_net_rss_write_key() - Write RSS hash key to device
2413 * @nn: NFP Net device to reconfigure
2415 void nfp_net_rss_write_key(struct nfp_net *nn)
2419 for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4)
2420 nn_writel(nn, NFP_NET_CFG_RSS_KEY + i,
2421 get_unaligned_le32(nn->rss_key + i));
2425 * nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW
2426 * @nn: NFP Net device to reconfigure
2428 void nfp_net_coalesce_write_cfg(struct nfp_net *nn)
2434 /* Compute factor used to convert coalesce '_usecs' parameters to
2435 * ME timestamp ticks. There are 16 ME clock cycles for each timestamp
2438 factor = nn->me_freq_mhz / 16;
2440 /* copy RX interrupt coalesce parameters */
2441 value = (nn->rx_coalesce_max_frames << 16) |
2442 (factor * nn->rx_coalesce_usecs);
2443 for (i = 0; i < nn->dp.num_rx_rings; i++)
2444 nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value);
2446 /* copy TX interrupt coalesce parameters */
2447 value = (nn->tx_coalesce_max_frames << 16) |
2448 (factor * nn->tx_coalesce_usecs);
2449 for (i = 0; i < nn->dp.num_tx_rings; i++)
2450 nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value);
2454 * nfp_net_write_mac_addr() - Write mac address to the device control BAR
2455 * @nn: NFP Net device to reconfigure
2456 * @addr: MAC address to write
2458 * Writes the MAC address from the netdev to the device control BAR. Does not
2459 * perform the required reconfig. We do a bit of byte swapping dance because
2462 static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *addr)
2464 nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(addr));
2465 nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(addr + 4));
2468 static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx)
2470 nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0);
2471 nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0);
2472 nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0);
2474 nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0);
2475 nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0);
2476 nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0);
2480 * nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
2481 * @nn: NFP Net device to reconfigure
2483 static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
2485 u32 new_ctrl, update;
2489 new_ctrl = nn->dp.ctrl;
2490 new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE;
2491 update = NFP_NET_CFG_UPDATE_GEN;
2492 update |= NFP_NET_CFG_UPDATE_MSIX;
2493 update |= NFP_NET_CFG_UPDATE_RING;
2495 if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
2496 new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG;
2498 nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
2499 nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
2501 nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
2502 err = nfp_net_reconfig(nn, update);
2504 nn_err(nn, "Could not disable device: %d\n", err);
2506 for (r = 0; r < nn->dp.num_rx_rings; r++)
2507 nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]);
2508 for (r = 0; r < nn->dp.num_tx_rings; r++)
2509 nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]);
2510 for (r = 0; r < nn->dp.num_r_vecs; r++)
2511 nfp_net_vec_clear_ring_data(nn, r);
2513 nn->dp.ctrl = new_ctrl;
2517 nfp_net_rx_ring_hw_cfg_write(struct nfp_net *nn,
2518 struct nfp_net_rx_ring *rx_ring, unsigned int idx)
2520 /* Write the DMA address, size and MSI-X info to the device */
2521 nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), rx_ring->dma);
2522 nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(rx_ring->cnt));
2523 nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), rx_ring->r_vec->irq_entry);
2527 nfp_net_tx_ring_hw_cfg_write(struct nfp_net *nn,
2528 struct nfp_net_tx_ring *tx_ring, unsigned int idx)
2530 nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), tx_ring->dma);
2531 nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(tx_ring->cnt));
2532 nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), tx_ring->r_vec->irq_entry);
2536 * nfp_net_set_config_and_enable() - Write control BAR and enable NFP
2537 * @nn: NFP Net device to reconfigure
2539 static int nfp_net_set_config_and_enable(struct nfp_net *nn)
2541 u32 bufsz, new_ctrl, update = 0;
2545 new_ctrl = nn->dp.ctrl;
2547 if (nn->dp.ctrl & NFP_NET_CFG_CTRL_RSS_ANY) {
2548 nfp_net_rss_write_key(nn);
2549 nfp_net_rss_write_itbl(nn);
2550 nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
2551 update |= NFP_NET_CFG_UPDATE_RSS;
2554 if (nn->dp.ctrl & NFP_NET_CFG_CTRL_IRQMOD) {
2555 nfp_net_coalesce_write_cfg(nn);
2556 update |= NFP_NET_CFG_UPDATE_IRQMOD;
2559 for (r = 0; r < nn->dp.num_tx_rings; r++)
2560 nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r);
2561 for (r = 0; r < nn->dp.num_rx_rings; r++)
2562 nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r);
2564 nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->dp.num_tx_rings == 64 ?
2565 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_tx_rings) - 1);
2567 nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->dp.num_rx_rings == 64 ?
2568 0xffffffffffffffffULL : ((u64)1 << nn->dp.num_rx_rings) - 1);
2571 nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr);
2573 nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.mtu);
2575 bufsz = nn->dp.fl_bufsz - nn->dp.rx_dma_off - NFP_NET_RX_BUF_NON_DATA;
2576 nn_writel(nn, NFP_NET_CFG_FLBUFSZ, bufsz);
2579 new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
2580 update |= NFP_NET_CFG_UPDATE_GEN;
2581 update |= NFP_NET_CFG_UPDATE_MSIX;
2582 update |= NFP_NET_CFG_UPDATE_RING;
2583 if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
2584 new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;
2586 nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
2587 err = nfp_net_reconfig(nn, update);
2589 nfp_net_clear_config_and_disable(nn);
2593 nn->dp.ctrl = new_ctrl;
2595 for (r = 0; r < nn->dp.num_rx_rings; r++)
2596 nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]);
2598 /* Since reconfiguration requests while NFP is down are ignored we
2599 * have to wipe the entire VXLAN configuration and reinitialize it.
2601 if (nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN) {
2602 memset(&nn->vxlan_ports, 0, sizeof(nn->vxlan_ports));
2603 memset(&nn->vxlan_usecnt, 0, sizeof(nn->vxlan_usecnt));
2604 udp_tunnel_get_rx_info(nn->dp.netdev);
2611 * nfp_net_close_stack() - Quiesce the stack (part of close)
2612 * @nn: NFP Net device to reconfigure
2614 static void nfp_net_close_stack(struct nfp_net *nn)
2618 disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
2619 netif_carrier_off(nn->dp.netdev);
2620 nn->link_up = false;
2622 for (r = 0; r < nn->dp.num_r_vecs; r++) {
2623 disable_irq(nn->r_vecs[r].irq_vector);
2624 napi_disable(&nn->r_vecs[r].napi);
2627 netif_tx_disable(nn->dp.netdev);
2631 * nfp_net_close_free_all() - Free all runtime resources
2632 * @nn: NFP Net device to reconfigure
2634 static void nfp_net_close_free_all(struct nfp_net *nn)
2638 nfp_net_tx_rings_free(&nn->dp);
2639 nfp_net_rx_rings_free(&nn->dp);
2641 for (r = 0; r < nn->dp.num_r_vecs; r++)
2642 nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
2644 nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
2645 nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
2649 * nfp_net_netdev_close() - Called when the device is downed
2650 * @netdev: netdev structure
2652 static int nfp_net_netdev_close(struct net_device *netdev)
2654 struct nfp_net *nn = netdev_priv(netdev);
2656 /* Step 1: Disable RX and TX rings from the Linux kernel perspective
2658 nfp_net_close_stack(nn);
2662 nfp_net_clear_config_and_disable(nn);
2664 /* Step 3: Free resources
2666 nfp_net_close_free_all(nn);
2668 nn_dbg(nn, "%s down", netdev->name);
2672 void nfp_ctrl_close(struct nfp_net *nn)
2678 for (r = 0; r < nn->dp.num_r_vecs; r++) {
2679 disable_irq(nn->r_vecs[r].irq_vector);
2680 tasklet_disable(&nn->r_vecs[r].tasklet);
2683 nfp_net_clear_config_and_disable(nn);
2685 nfp_net_close_free_all(nn);
2691 * nfp_net_open_stack() - Start the device from stack's perspective
2692 * @nn: NFP Net device to reconfigure
2694 static void nfp_net_open_stack(struct nfp_net *nn)
2698 for (r = 0; r < nn->dp.num_r_vecs; r++) {
2699 napi_enable(&nn->r_vecs[r].napi);
2700 enable_irq(nn->r_vecs[r].irq_vector);
2703 netif_tx_wake_all_queues(nn->dp.netdev);
2705 enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
2706 nfp_net_read_link_status(nn);
2709 static int nfp_net_open_alloc_all(struct nfp_net *nn)
2713 err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn",
2714 nn->exn_name, sizeof(nn->exn_name),
2715 NFP_NET_IRQ_EXN_IDX, nn->exn_handler);
2718 err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
2719 nn->lsc_name, sizeof(nn->lsc_name),
2720 NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
2723 disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
2725 for (r = 0; r < nn->dp.num_r_vecs; r++) {
2726 err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
2728 goto err_cleanup_vec_p;
2731 err = nfp_net_rx_rings_prepare(nn, &nn->dp);
2733 goto err_cleanup_vec;
2735 err = nfp_net_tx_rings_prepare(nn, &nn->dp);
2737 goto err_free_rx_rings;
2739 for (r = 0; r < nn->max_r_vecs; r++)
2740 nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);
2745 nfp_net_rx_rings_free(&nn->dp);
2747 r = nn->dp.num_r_vecs;
2750 nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
2751 nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
2753 nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
2757 static int nfp_net_netdev_open(struct net_device *netdev)
2759 struct nfp_net *nn = netdev_priv(netdev);
2762 /* Step 1: Allocate resources for rings and the like
2763 * - Request interrupts
2764 * - Allocate RX and TX ring resources
2765 * - Setup initial RSS table
2767 err = nfp_net_open_alloc_all(nn);
2771 err = netif_set_real_num_tx_queues(netdev, nn->dp.num_stack_tx_rings);
2775 err = netif_set_real_num_rx_queues(netdev, nn->dp.num_rx_rings);
2779 /* Step 2: Configure the NFP
2780 * - Enable rings from 0 to tx_rings/rx_rings - 1.
2781 * - Write MAC address (in case it changed)
2783 * - Set the Freelist buffer size
2786 err = nfp_net_set_config_and_enable(nn);
2790 /* Step 3: Enable for kernel
2791 * - put some freelist descriptors on each RX ring
2792 * - enable NAPI on each ring
2793 * - enable all TX queues
2796 nfp_net_open_stack(nn);
2801 nfp_net_close_free_all(nn);
2805 int nfp_ctrl_open(struct nfp_net *nn)
2809 /* ring dumping depends on vNICs being opened/closed under rtnl */
2812 err = nfp_net_open_alloc_all(nn);
2816 err = nfp_net_set_config_and_enable(nn);
2820 for (r = 0; r < nn->dp.num_r_vecs; r++)
2821 enable_irq(nn->r_vecs[r].irq_vector);
2828 nfp_net_close_free_all(nn);
2834 static void nfp_net_set_rx_mode(struct net_device *netdev)
2836 struct nfp_net *nn = netdev_priv(netdev);
2839 new_ctrl = nn->dp.ctrl;
2841 if (netdev->flags & IFF_PROMISC) {
2842 if (nn->cap & NFP_NET_CFG_CTRL_PROMISC)
2843 new_ctrl |= NFP_NET_CFG_CTRL_PROMISC;
2845 nn_warn(nn, "FW does not support promiscuous mode\n");
2847 new_ctrl &= ~NFP_NET_CFG_CTRL_PROMISC;
2850 if (new_ctrl == nn->dp.ctrl)
2853 nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
2854 nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN);
2856 nn->dp.ctrl = new_ctrl;
2859 static void nfp_net_rss_init_itbl(struct nfp_net *nn)
2863 for (i = 0; i < sizeof(nn->rss_itbl); i++)
2865 ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings);
2868 static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp)
2870 struct nfp_net_dp new_dp = *dp;
2875 nn->dp.netdev->mtu = new_dp.mtu;
2877 if (!netif_is_rxfh_configured(nn->dp.netdev))
2878 nfp_net_rss_init_itbl(nn);
2881 static int nfp_net_dp_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp)
2886 nfp_net_dp_swap(nn, dp);
2888 for (r = 0; r < nn->max_r_vecs; r++)
2889 nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);
2891 err = netif_set_real_num_rx_queues(nn->dp.netdev, nn->dp.num_rx_rings);
2895 if (nn->dp.netdev->real_num_tx_queues != nn->dp.num_stack_tx_rings) {
2896 err = netif_set_real_num_tx_queues(nn->dp.netdev,
2897 nn->dp.num_stack_tx_rings);
2902 return nfp_net_set_config_and_enable(nn);
2905 struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn)
2907 struct nfp_net_dp *new;
2909 new = kmalloc(sizeof(*new), GFP_KERNEL);
2915 /* Clear things which need to be recomputed */
2917 new->tx_rings = NULL;
2918 new->rx_rings = NULL;
2919 new->num_r_vecs = 0;
2920 new->num_stack_tx_rings = 0;
2926 nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp,
2927 struct netlink_ext_ack *extack)
2929 /* XDP-enabled tests */
2932 if (dp->fl_bufsz > PAGE_SIZE) {
2933 NL_SET_ERR_MSG_MOD(extack, "MTU too large w/ XDP enabled");
2936 if (dp->num_tx_rings > nn->max_tx_rings) {
2937 NL_SET_ERR_MSG_MOD(extack, "Insufficient number of TX rings w/ XDP enabled");
2944 int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp,
2945 struct netlink_ext_ack *extack)
2949 dp->fl_bufsz = nfp_net_calc_fl_bufsz(dp);
2951 dp->num_stack_tx_rings = dp->num_tx_rings;
2953 dp->num_stack_tx_rings -= dp->num_rx_rings;
2955 dp->num_r_vecs = max(dp->num_rx_rings, dp->num_stack_tx_rings);
2957 err = nfp_net_check_config(nn, dp, extack);
2961 if (!netif_running(dp->netdev)) {
2962 nfp_net_dp_swap(nn, dp);
2967 /* Prepare new rings */
2968 for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) {
2969 err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
2972 goto err_cleanup_vecs;
2976 err = nfp_net_rx_rings_prepare(nn, dp);
2978 goto err_cleanup_vecs;
2980 err = nfp_net_tx_rings_prepare(nn, dp);
2984 /* Stop device, swap in new rings, try to start the firmware */
2985 nfp_net_close_stack(nn);
2986 nfp_net_clear_config_and_disable(nn);
2988 err = nfp_net_dp_swap_enable(nn, dp);
2992 nfp_net_clear_config_and_disable(nn);
2994 /* Try with old configuration and old rings */
2995 err2 = nfp_net_dp_swap_enable(nn, dp);
2997 nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
3000 for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
3001 nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
3003 nfp_net_rx_rings_free(dp);
3004 nfp_net_tx_rings_free(dp);
3006 nfp_net_open_stack(nn);
3013 nfp_net_rx_rings_free(dp);
3015 for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
3016 nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
3021 static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
3023 struct nfp_net *nn = netdev_priv(netdev);
3024 struct nfp_net_dp *dp;
3026 dp = nfp_net_clone_dp(nn);
3032 return nfp_net_ring_reconfig(nn, dp, NULL);
3036 nfp_net_vlan_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
3038 struct nfp_net *nn = netdev_priv(netdev);
3040 /* Priority tagged packets with vlan id 0 are processed by the
3041 * NFP as untagged packets
3046 nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_VID, vid);
3047 nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_PROTO, ETH_P_8021Q);
3049 return nfp_net_reconfig_mbox(nn, NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_ADD);
3053 nfp_net_vlan_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
3055 struct nfp_net *nn = netdev_priv(netdev);
3057 /* Priority tagged packets with vlan id 0 are processed by the
3058 * NFP as untagged packets
3063 nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_VID, vid);
3064 nn_writew(nn, NFP_NET_CFG_VLAN_FILTER_PROTO, ETH_P_8021Q);
3066 return nfp_net_reconfig_mbox(nn, NFP_NET_CFG_MBOX_CMD_CTAG_FILTER_KILL);
3069 static void nfp_net_stat64(struct net_device *netdev,
3070 struct rtnl_link_stats64 *stats)
3072 struct nfp_net *nn = netdev_priv(netdev);
3075 for (r = 0; r < nn->dp.num_r_vecs; r++) {
3076 struct nfp_net_r_vector *r_vec = &nn->r_vecs[r];
3081 start = u64_stats_fetch_begin(&r_vec->rx_sync);
3082 data[0] = r_vec->rx_pkts;
3083 data[1] = r_vec->rx_bytes;
3084 data[2] = r_vec->rx_drops;
3085 } while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
3086 stats->rx_packets += data[0];
3087 stats->rx_bytes += data[1];
3088 stats->rx_dropped += data[2];
3091 start = u64_stats_fetch_begin(&r_vec->tx_sync);
3092 data[0] = r_vec->tx_pkts;
3093 data[1] = r_vec->tx_bytes;
3094 data[2] = r_vec->tx_errors;
3095 } while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
3096 stats->tx_packets += data[0];
3097 stats->tx_bytes += data[1];
3098 stats->tx_errors += data[2];
3102 static int nfp_net_set_features(struct net_device *netdev,
3103 netdev_features_t features)
3105 netdev_features_t changed = netdev->features ^ features;
3106 struct nfp_net *nn = netdev_priv(netdev);
3110 /* Assume this is not called with features we have not advertised */
3112 new_ctrl = nn->dp.ctrl;
3114 if (changed & NETIF_F_RXCSUM) {
3115 if (features & NETIF_F_RXCSUM)
3116 new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY;
3118 new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM_ANY;
3121 if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
3122 if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
3123 new_ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
3125 new_ctrl &= ~NFP_NET_CFG_CTRL_TXCSUM;
3128 if (changed & (NETIF_F_TSO | NETIF_F_TSO6)) {
3129 if (features & (NETIF_F_TSO | NETIF_F_TSO6))
3130 new_ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?:
3131 NFP_NET_CFG_CTRL_LSO;
3133 new_ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY;
3136 if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
3137 if (features & NETIF_F_HW_VLAN_CTAG_RX)
3138 new_ctrl |= NFP_NET_CFG_CTRL_RXVLAN;
3140 new_ctrl &= ~NFP_NET_CFG_CTRL_RXVLAN;
3143 if (changed & NETIF_F_HW_VLAN_CTAG_TX) {
3144 if (features & NETIF_F_HW_VLAN_CTAG_TX)
3145 new_ctrl |= NFP_NET_CFG_CTRL_TXVLAN;
3147 new_ctrl &= ~NFP_NET_CFG_CTRL_TXVLAN;
3150 if (changed & NETIF_F_HW_VLAN_CTAG_FILTER) {
3151 if (features & NETIF_F_HW_VLAN_CTAG_FILTER)
3152 new_ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER;
3154 new_ctrl &= ~NFP_NET_CFG_CTRL_CTAG_FILTER;
3157 if (changed & NETIF_F_SG) {
3158 if (features & NETIF_F_SG)
3159 new_ctrl |= NFP_NET_CFG_CTRL_GATHER;
3161 new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER;
3164 if (changed & NETIF_F_HW_TC && nfp_app_tc_busy(nn->app, nn)) {
3165 nn_err(nn, "Cannot disable HW TC offload while in use\n");
3169 nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n",
3170 netdev->features, features, changed);
3172 if (new_ctrl == nn->dp.ctrl)
3175 nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->dp.ctrl, new_ctrl);
3176 nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
3177 err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
3181 nn->dp.ctrl = new_ctrl;
3186 static netdev_features_t
3187 nfp_net_features_check(struct sk_buff *skb, struct net_device *dev,
3188 netdev_features_t features)
3192 /* We can't do TSO over double tagged packets (802.1AD) */
3193 features &= vlan_features_check(skb, features);
3195 if (!skb->encapsulation)
3198 /* Ensure that inner L4 header offset fits into TX descriptor field */
3199 if (skb_is_gso(skb)) {
3202 hdrlen = skb_inner_transport_header(skb) - skb->data +
3203 inner_tcp_hdrlen(skb);
3205 if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ))
3206 features &= ~NETIF_F_GSO_MASK;
3209 /* VXLAN/GRE check */
3210 switch (vlan_get_protocol(skb)) {
3211 case htons(ETH_P_IP):
3212 l4_hdr = ip_hdr(skb)->protocol;
3214 case htons(ETH_P_IPV6):
3215 l4_hdr = ipv6_hdr(skb)->nexthdr;
3218 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
3221 if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
3222 skb->inner_protocol != htons(ETH_P_TEB) ||
3223 (l4_hdr != IPPROTO_UDP && l4_hdr != IPPROTO_GRE) ||
3224 (l4_hdr == IPPROTO_UDP &&
3225 (skb_inner_mac_header(skb) - skb_transport_header(skb) !=
3226 sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
3227 return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
3233 * nfp_net_set_vxlan_port() - set vxlan port in SW and reconfigure HW
3234 * @nn: NFP Net device to reconfigure
3235 * @idx: Index into the port table where new port should be written
3236 * @port: UDP port to configure (pass zero to remove VXLAN port)
3238 static void nfp_net_set_vxlan_port(struct nfp_net *nn, int idx, __be16 port)
3242 nn->vxlan_ports[idx] = port;
3244 if (!(nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN))
3247 BUILD_BUG_ON(NFP_NET_N_VXLAN_PORTS & 1);
3248 for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i += 2)
3249 nn_writel(nn, NFP_NET_CFG_VXLAN_PORT + i * sizeof(port),
3250 be16_to_cpu(nn->vxlan_ports[i + 1]) << 16 |
3251 be16_to_cpu(nn->vxlan_ports[i]));
3253 nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_VXLAN);
3257 * nfp_net_find_vxlan_idx() - find table entry of the port or a free one
3258 * @nn: NFP Network structure
3259 * @port: UDP port to look for
3261 * Return: if the port is already in the table -- it's position;
3262 * if the port is not in the table -- free position to use;
3263 * if the table is full -- -ENOSPC.
3265 static int nfp_net_find_vxlan_idx(struct nfp_net *nn, __be16 port)
3267 int i, free_idx = -ENOSPC;
3269 for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i++) {
3270 if (nn->vxlan_ports[i] == port)
3272 if (!nn->vxlan_usecnt[i])
3279 static void nfp_net_add_vxlan_port(struct net_device *netdev,
3280 struct udp_tunnel_info *ti)
3282 struct nfp_net *nn = netdev_priv(netdev);
3285 if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
3288 idx = nfp_net_find_vxlan_idx(nn, ti->port);
3292 if (!nn->vxlan_usecnt[idx]++)
3293 nfp_net_set_vxlan_port(nn, idx, ti->port);
3296 static void nfp_net_del_vxlan_port(struct net_device *netdev,
3297 struct udp_tunnel_info *ti)
3299 struct nfp_net *nn = netdev_priv(netdev);
3302 if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
3305 idx = nfp_net_find_vxlan_idx(nn, ti->port);
3306 if (idx == -ENOSPC || !nn->vxlan_usecnt[idx])
3309 if (!--nn->vxlan_usecnt[idx])
3310 nfp_net_set_vxlan_port(nn, idx, 0);
3314 nfp_net_xdp_setup_drv(struct nfp_net *nn, struct bpf_prog *prog,
3315 struct netlink_ext_ack *extack)
3317 struct nfp_net_dp *dp;
3319 if (!prog == !nn->dp.xdp_prog) {
3320 WRITE_ONCE(nn->dp.xdp_prog, prog);
3324 dp = nfp_net_clone_dp(nn);
3328 dp->xdp_prog = prog;
3329 dp->num_tx_rings += prog ? nn->dp.num_rx_rings : -nn->dp.num_rx_rings;
3330 dp->rx_dma_dir = prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
3331 dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0;
3333 /* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
3334 return nfp_net_ring_reconfig(nn, dp, extack);
3338 nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog, u32 flags,
3339 struct netlink_ext_ack *extack)
3341 struct bpf_prog *drv_prog, *offload_prog;
3344 if (nn->xdp_prog && (flags ^ nn->xdp_flags) & XDP_FLAGS_MODES)
3347 /* Load both when no flags set to allow easy activation of driver path
3348 * when program is replaced by one which can't be offloaded.
3350 drv_prog = flags & XDP_FLAGS_HW_MODE ? NULL : prog;
3351 offload_prog = flags & XDP_FLAGS_DRV_MODE ? NULL : prog;
3353 err = nfp_net_xdp_setup_drv(nn, drv_prog, extack);
3357 err = nfp_app_xdp_offload(nn->app, nn, offload_prog);
3358 if (err && flags & XDP_FLAGS_HW_MODE)
3362 bpf_prog_put(nn->xdp_prog);
3363 nn->xdp_prog = prog;
3364 nn->xdp_flags = flags;
3369 static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
3371 struct nfp_net *nn = netdev_priv(netdev);
3373 switch (xdp->command) {
3374 case XDP_SETUP_PROG:
3375 case XDP_SETUP_PROG_HW:
3376 return nfp_net_xdp_setup(nn, xdp->prog, xdp->flags,
3378 case XDP_QUERY_PROG:
3379 xdp->prog_attached = !!nn->xdp_prog;
3380 if (nn->dp.bpf_offload_xdp)
3381 xdp->prog_attached = XDP_ATTACHED_HW;
3382 xdp->prog_id = nn->xdp_prog ? nn->xdp_prog->aux->id : 0;
3389 static int nfp_net_set_mac_address(struct net_device *netdev, void *addr)
3391 struct nfp_net *nn = netdev_priv(netdev);
3392 struct sockaddr *saddr = addr;
3395 err = eth_prepare_mac_addr_change(netdev, addr);
3399 nfp_net_write_mac_addr(nn, saddr->sa_data);
3401 err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MACADDR);
3405 eth_commit_mac_addr_change(netdev, addr);
3410 const struct net_device_ops nfp_net_netdev_ops = {
3411 .ndo_open = nfp_net_netdev_open,
3412 .ndo_stop = nfp_net_netdev_close,
3413 .ndo_start_xmit = nfp_net_tx,
3414 .ndo_get_stats64 = nfp_net_stat64,
3415 .ndo_vlan_rx_add_vid = nfp_net_vlan_rx_add_vid,
3416 .ndo_vlan_rx_kill_vid = nfp_net_vlan_rx_kill_vid,
3417 .ndo_setup_tc = nfp_port_setup_tc,
3418 .ndo_tx_timeout = nfp_net_tx_timeout,
3419 .ndo_set_rx_mode = nfp_net_set_rx_mode,
3420 .ndo_change_mtu = nfp_net_change_mtu,
3421 .ndo_set_mac_address = nfp_net_set_mac_address,
3422 .ndo_set_features = nfp_net_set_features,
3423 .ndo_features_check = nfp_net_features_check,
3424 .ndo_get_phys_port_name = nfp_port_get_phys_port_name,
3425 .ndo_udp_tunnel_add = nfp_net_add_vxlan_port,
3426 .ndo_udp_tunnel_del = nfp_net_del_vxlan_port,
3427 .ndo_xdp = nfp_net_xdp,
3431 * nfp_net_info() - Print general info about the NIC
3432 * @nn: NFP Net device to reconfigure
3434 void nfp_net_info(struct nfp_net *nn)
3436 nn_info(nn, "Netronome NFP-6xxx %sNetdev: TxQs=%d/%d RxQs=%d/%d\n",
3437 nn->dp.is_vf ? "VF " : "",
3438 nn->dp.num_tx_rings, nn->max_tx_rings,
3439 nn->dp.num_rx_rings, nn->max_rx_rings);
3440 nn_info(nn, "VER: %d.%d.%d.%d, Maximum supported MTU: %d\n",
3441 nn->fw_ver.resv, nn->fw_ver.class,
3442 nn->fw_ver.major, nn->fw_ver.minor,
3444 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",
3446 nn->cap & NFP_NET_CFG_CTRL_PROMISC ? "PROMISC " : "",
3447 nn->cap & NFP_NET_CFG_CTRL_L2BC ? "L2BCFILT " : "",
3448 nn->cap & NFP_NET_CFG_CTRL_L2MC ? "L2MCFILT " : "",
3449 nn->cap & NFP_NET_CFG_CTRL_RXCSUM ? "RXCSUM " : "",
3450 nn->cap & NFP_NET_CFG_CTRL_TXCSUM ? "TXCSUM " : "",
3451 nn->cap & NFP_NET_CFG_CTRL_RXVLAN ? "RXVLAN " : "",
3452 nn->cap & NFP_NET_CFG_CTRL_TXVLAN ? "TXVLAN " : "",
3453 nn->cap & NFP_NET_CFG_CTRL_SCATTER ? "SCATTER " : "",
3454 nn->cap & NFP_NET_CFG_CTRL_GATHER ? "GATHER " : "",
3455 nn->cap & NFP_NET_CFG_CTRL_LSO ? "TSO1 " : "",
3456 nn->cap & NFP_NET_CFG_CTRL_LSO2 ? "TSO2 " : "",
3457 nn->cap & NFP_NET_CFG_CTRL_RSS ? "RSS1 " : "",
3458 nn->cap & NFP_NET_CFG_CTRL_RSS2 ? "RSS2 " : "",
3459 nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER ? "CTAG_FILTER " : "",
3460 nn->cap & NFP_NET_CFG_CTRL_L2SWITCH ? "L2SWITCH " : "",
3461 nn->cap & NFP_NET_CFG_CTRL_MSIXAUTO ? "AUTOMASK " : "",
3462 nn->cap & NFP_NET_CFG_CTRL_IRQMOD ? "IRQMOD " : "",
3463 nn->cap & NFP_NET_CFG_CTRL_VXLAN ? "VXLAN " : "",
3464 nn->cap & NFP_NET_CFG_CTRL_NVGRE ? "NVGRE " : "",
3465 nn->cap & NFP_NET_CFG_CTRL_CSUM_COMPLETE ?
3466 "RXCSUM_COMPLETE " : "",
3467 nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR ? "LIVE_ADDR " : "",
3468 nfp_app_extra_cap(nn->app, nn));
3472 * nfp_net_alloc() - Allocate netdev and related structure
3474 * @needs_netdev: Whether to allocate a netdev for this vNIC
3475 * @max_tx_rings: Maximum number of TX rings supported by device
3476 * @max_rx_rings: Maximum number of RX rings supported by device
3478 * This function allocates a netdev device and fills in the initial
3479 * part of the @struct nfp_net structure. In case of control device
3480 * nfp_net structure is allocated without the netdev.
3482 * Return: NFP Net device structure, or ERR_PTR on error.
3484 struct nfp_net *nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev,
3485 unsigned int max_tx_rings,
3486 unsigned int max_rx_rings)
3491 struct net_device *netdev;
3493 netdev = alloc_etherdev_mqs(sizeof(struct nfp_net),
3494 max_tx_rings, max_rx_rings);
3496 return ERR_PTR(-ENOMEM);
3498 SET_NETDEV_DEV(netdev, &pdev->dev);
3499 nn = netdev_priv(netdev);
3500 nn->dp.netdev = netdev;
3502 nn = vzalloc(sizeof(*nn));
3504 return ERR_PTR(-ENOMEM);
3507 nn->dp.dev = &pdev->dev;
3510 nn->max_tx_rings = max_tx_rings;
3511 nn->max_rx_rings = max_rx_rings;
3513 nn->dp.num_tx_rings = min_t(unsigned int,
3514 max_tx_rings, num_online_cpus());
3515 nn->dp.num_rx_rings = min_t(unsigned int, max_rx_rings,
3516 netif_get_num_default_rss_queues());
3518 nn->dp.num_r_vecs = max(nn->dp.num_tx_rings, nn->dp.num_rx_rings);
3519 nn->dp.num_r_vecs = min_t(unsigned int,
3520 nn->dp.num_r_vecs, num_online_cpus());
3522 nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT;
3523 nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT;
3525 spin_lock_init(&nn->reconfig_lock);
3526 spin_lock_init(&nn->link_status_lock);
3528 setup_timer(&nn->reconfig_timer,
3529 nfp_net_reconfig_timer, (unsigned long)nn);
3535 * nfp_net_free() - Undo what @nfp_net_alloc() did
3536 * @nn: NFP Net device to reconfigure
3538 void nfp_net_free(struct nfp_net *nn)
3541 bpf_prog_put(nn->xdp_prog);
3544 free_netdev(nn->dp.netdev);
3550 * nfp_net_rss_key_sz() - Get current size of the RSS key
3551 * @nn: NFP Net device instance
3553 * Return: size of the RSS key for currently selected hash function.
3555 unsigned int nfp_net_rss_key_sz(struct nfp_net *nn)
3557 switch (nn->rss_hfunc) {
3558 case ETH_RSS_HASH_TOP:
3559 return NFP_NET_CFG_RSS_KEY_SZ;
3560 case ETH_RSS_HASH_XOR:
3562 case ETH_RSS_HASH_CRC32:
3566 nn_warn(nn, "Unknown hash function: %u\n", nn->rss_hfunc);
3571 * nfp_net_rss_init() - Set the initial RSS parameters
3572 * @nn: NFP Net device to reconfigure
3574 static void nfp_net_rss_init(struct nfp_net *nn)
3576 unsigned long func_bit, rss_cap_hfunc;
3579 /* Read the RSS function capability and select first supported func */
3580 reg = nn_readl(nn, NFP_NET_CFG_RSS_CAP);
3581 rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, reg);
3583 rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC,
3584 NFP_NET_CFG_RSS_TOEPLITZ);
3586 func_bit = find_first_bit(&rss_cap_hfunc, NFP_NET_CFG_RSS_HFUNCS);
3587 if (func_bit == NFP_NET_CFG_RSS_HFUNCS) {
3588 dev_warn(nn->dp.dev,
3589 "Bad RSS config, defaulting to Toeplitz hash\n");
3590 func_bit = ETH_RSS_HASH_TOP_BIT;
3592 nn->rss_hfunc = 1 << func_bit;
3594 netdev_rss_key_fill(nn->rss_key, nfp_net_rss_key_sz(nn));
3596 nfp_net_rss_init_itbl(nn);
3598 /* Enable IPv4/IPv6 TCP by default */
3599 nn->rss_cfg = NFP_NET_CFG_RSS_IPV4_TCP |
3600 NFP_NET_CFG_RSS_IPV6_TCP |
3601 FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc) |
3602 NFP_NET_CFG_RSS_MASK;
3606 * nfp_net_irqmod_init() - Set the initial IRQ moderation parameters
3607 * @nn: NFP Net device to reconfigure
3609 static void nfp_net_irqmod_init(struct nfp_net *nn)
3611 nn->rx_coalesce_usecs = 50;
3612 nn->rx_coalesce_max_frames = 64;
3613 nn->tx_coalesce_usecs = 50;
3614 nn->tx_coalesce_max_frames = 64;
3617 static void nfp_net_netdev_init(struct nfp_net *nn)
3619 struct net_device *netdev = nn->dp.netdev;
3621 nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr);
3623 netdev->mtu = nn->dp.mtu;
3625 /* Advertise/enable offloads based on capabilities
3627 * Note: netdev->features show the currently enabled features
3628 * and netdev->hw_features advertises which features are
3629 * supported. By default we enable most features.
3631 if (nn->cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
3632 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
3634 netdev->hw_features = NETIF_F_HIGHDMA;
3635 if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY) {
3636 netdev->hw_features |= NETIF_F_RXCSUM;
3637 nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RXCSUM_ANY;
3639 if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) {
3640 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
3641 nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
3643 if (nn->cap & NFP_NET_CFG_CTRL_GATHER) {
3644 netdev->hw_features |= NETIF_F_SG;
3645 nn->dp.ctrl |= NFP_NET_CFG_CTRL_GATHER;
3647 if ((nn->cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
3648 nn->cap & NFP_NET_CFG_CTRL_LSO2) {
3649 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
3650 nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_LSO2 ?:
3651 NFP_NET_CFG_CTRL_LSO;
3653 if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY)
3654 netdev->hw_features |= NETIF_F_RXHASH;
3655 if (nn->cap & NFP_NET_CFG_CTRL_VXLAN &&
3656 nn->cap & NFP_NET_CFG_CTRL_NVGRE) {
3657 if (nn->cap & NFP_NET_CFG_CTRL_LSO)
3658 netdev->hw_features |= NETIF_F_GSO_GRE |
3659 NETIF_F_GSO_UDP_TUNNEL;
3660 nn->dp.ctrl |= NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE;
3662 netdev->hw_enc_features = netdev->hw_features;
3665 netdev->vlan_features = netdev->hw_features;
3667 if (nn->cap & NFP_NET_CFG_CTRL_RXVLAN) {
3668 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
3669 nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXVLAN;
3671 if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN) {
3672 if (nn->cap & NFP_NET_CFG_CTRL_LSO2) {
3673 nn_warn(nn, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
3675 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
3676 nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXVLAN;
3679 if (nn->cap & NFP_NET_CFG_CTRL_CTAG_FILTER) {
3680 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
3681 nn->dp.ctrl |= NFP_NET_CFG_CTRL_CTAG_FILTER;
3684 netdev->features = netdev->hw_features;
3686 if (nfp_app_has_tc(nn->app))
3687 netdev->hw_features |= NETIF_F_HW_TC;
3689 /* Advertise but disable TSO by default. */
3690 netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
3691 nn->dp.ctrl &= ~NFP_NET_CFG_CTRL_LSO_ANY;
3693 /* Finalise the netdev setup */
3694 netdev->netdev_ops = &nfp_net_netdev_ops;
3695 netdev->watchdog_timeo = msecs_to_jiffies(5 * 1000);
3697 SWITCHDEV_SET_OPS(netdev, &nfp_port_switchdev_ops);
3699 /* MTU range: 68 - hw-specific max */
3700 netdev->min_mtu = ETH_MIN_MTU;
3701 netdev->max_mtu = nn->max_mtu;
3703 netif_carrier_off(netdev);
3705 nfp_net_set_ethtool_ops(netdev);
3709 * nfp_net_init() - Initialise/finalise the nfp_net structure
3710 * @nn: NFP Net device structure
3712 * Return: 0 on success or negative errno on error.
3714 int nfp_net_init(struct nfp_net *nn)
3718 nn->dp.rx_dma_dir = DMA_FROM_DEVICE;
3720 /* Get some of the read-only fields from the BAR */
3721 nn->cap = nn_readl(nn, NFP_NET_CFG_CAP);
3722 nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU);
3724 /* ABI 4.x and ctrl vNIC always use chained metadata, in other cases
3725 * we allow use of non-chained metadata if RSS(v1) is the only
3726 * advertised capability requiring metadata.
3728 nn->dp.chained_metadata_format = nn->fw_ver.major == 4 ||
3730 !(nn->cap & NFP_NET_CFG_CTRL_RSS) ||
3731 nn->cap & NFP_NET_CFG_CTRL_CHAIN_META;
3732 /* RSS(v1) uses non-chained metadata format, except in ABI 4.x where
3733 * it has the same meaning as RSSv2.
3735 if (nn->dp.chained_metadata_format && nn->fw_ver.major != 4)
3736 nn->cap &= ~NFP_NET_CFG_CTRL_RSS;
3738 /* Determine RX packet/metadata boundary offset */
3739 if (nn->fw_ver.major >= 2) {
3742 reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET);
3743 if (reg > NFP_NET_MAX_PREPEND) {
3744 nn_err(nn, "Invalid rx offset: %d\n", reg);
3747 nn->dp.rx_offset = reg;
3749 nn->dp.rx_offset = NFP_NET_RX_OFFSET;
3752 /* Set default MTU and Freelist buffer size */
3753 if (nn->max_mtu < NFP_NET_DEFAULT_MTU)
3754 nn->dp.mtu = nn->max_mtu;
3756 nn->dp.mtu = NFP_NET_DEFAULT_MTU;
3757 nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp);
3759 if (nn->cap & NFP_NET_CFG_CTRL_RSS_ANY) {
3760 nfp_net_rss_init(nn);
3761 nn->dp.ctrl |= nn->cap & NFP_NET_CFG_CTRL_RSS2 ?:
3762 NFP_NET_CFG_CTRL_RSS;
3765 /* Allow L2 Broadcast and Multicast through by default, if supported */
3766 if (nn->cap & NFP_NET_CFG_CTRL_L2BC)
3767 nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2BC;
3768 if (nn->cap & NFP_NET_CFG_CTRL_L2MC)
3769 nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2MC;
3771 /* Allow IRQ moderation, if supported */
3772 if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
3773 nfp_net_irqmod_init(nn);
3774 nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
3778 nfp_net_netdev_init(nn);
3780 /* Stash the re-configuration queue away. First odd queue in TX Bar */
3781 nn->qcp_cfg = nn->tx_bar + NFP_QCP_QUEUE_ADDR_SZ;
3783 /* Make sure the FW knows the netdev is supposed to be disabled here */
3784 nn_writel(nn, NFP_NET_CFG_CTRL, 0);
3785 nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
3786 nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
3787 err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_RING |
3788 NFP_NET_CFG_UPDATE_GEN);
3792 nfp_net_vecs_init(nn);
3796 return register_netdev(nn->dp.netdev);
3800 * nfp_net_clean() - Undo what nfp_net_init() did.
3801 * @nn: NFP Net device structure
3803 void nfp_net_clean(struct nfp_net *nn)
3808 unregister_netdev(nn->dp.netdev);