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linux/drivers/net/ethernet/netronome/nfp/nfp_net_common.c

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/*
* Copyright (C) 2015-2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* nfp_net_common.c
* Netronome network device driver: Common functions between PF and VF
* Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
* Jason McMullan <jason.mcmullan@netronome.com>
* Rolf Neugebauer <rolf.neugebauer@netronome.com>
* Brad Petrus <brad.petrus@netronome.com>
* Chris Telfer <chris.telfer@netronome.com>
*/
#include <linux/bitfield.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/page_ref.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/msi.h>
#include <linux/ethtool.h>
#include <linux/log2.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
#include <linux/ktime.h>
#include <net/pkt_cls.h>
#include <net/vxlan.h>
#include "nfpcore/nfp_nsp.h"
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
/**
* nfp_net_get_fw_version() - Read and parse the FW version
* @fw_ver: Output fw_version structure to read to
* @ctrl_bar: Mapped address of the control BAR
*/
void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
void __iomem *ctrl_bar)
{
u32 reg;
reg = readl(ctrl_bar + NFP_NET_CFG_VERSION);
put_unaligned_le32(reg, fw_ver);
}
static dma_addr_t nfp_net_dma_map_rx(struct nfp_net_dp *dp, void *frag)
{
return dma_map_single(dp->dev, frag + NFP_NET_RX_BUF_HEADROOM,
dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
dp->rx_dma_dir);
}
static void nfp_net_dma_unmap_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr)
{
dma_unmap_single(dp->dev, dma_addr,
dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
dp->rx_dma_dir);
}
/* Firmware reconfig
*
* Firmware reconfig may take a while so we have two versions of it -
* synchronous and asynchronous (posted). All synchronous callers are holding
* RTNL so we don't have to worry about serializing them.
*/
static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update)
{
nn_writel(nn, NFP_NET_CFG_UPDATE, update);
/* ensure update is written before pinging HW */
nn_pci_flush(nn);
nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1);
}
/* Pass 0 as update to run posted reconfigs. */
static void nfp_net_reconfig_start_async(struct nfp_net *nn, u32 update)
{
update |= nn->reconfig_posted;
nn->reconfig_posted = 0;
nfp_net_reconfig_start(nn, update);
nn->reconfig_timer_active = true;
mod_timer(&nn->reconfig_timer, jiffies + NFP_NET_POLL_TIMEOUT * HZ);
}
static bool nfp_net_reconfig_check_done(struct nfp_net *nn, bool last_check)
{
u32 reg;
reg = nn_readl(nn, NFP_NET_CFG_UPDATE);
if (reg == 0)
return true;
if (reg & NFP_NET_CFG_UPDATE_ERR) {
nn_err(nn, "Reconfig error: 0x%08x\n", reg);
return true;
} else if (last_check) {
nn_err(nn, "Reconfig timeout: 0x%08x\n", reg);
return true;
}
return false;
}
static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
bool timed_out = false;
/* Poll update field, waiting for NFP to ack the config */
while (!nfp_net_reconfig_check_done(nn, timed_out)) {
msleep(1);
timed_out = time_is_before_eq_jiffies(deadline);
}
if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR)
return -EIO;
return timed_out ? -EIO : 0;
}
static void nfp_net_reconfig_timer(unsigned long data)
{
struct nfp_net *nn = (void *)data;
spin_lock_bh(&nn->reconfig_lock);
nn->reconfig_timer_active = false;
/* If sync caller is present it will take over from us */
if (nn->reconfig_sync_present)
goto done;
/* Read reconfig status and report errors */
nfp_net_reconfig_check_done(nn, true);
if (nn->reconfig_posted)
nfp_net_reconfig_start_async(nn, 0);
done:
spin_unlock_bh(&nn->reconfig_lock);
}
/**
* nfp_net_reconfig_post() - Post async reconfig request
* @nn: NFP Net device to reconfigure
* @update: The value for the update field in the BAR config
*
* Record FW reconfiguration request. Reconfiguration will be kicked off
* whenever reconfiguration machinery is idle. Multiple requests can be
* merged together!
*/
static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update)
{
spin_lock_bh(&nn->reconfig_lock);
/* Sync caller will kick off async reconf when it's done, just post */
if (nn->reconfig_sync_present) {
nn->reconfig_posted |= update;
goto done;
}
/* Opportunistically check if the previous command is done */
if (!nn->reconfig_timer_active ||
nfp_net_reconfig_check_done(nn, false))
nfp_net_reconfig_start_async(nn, update);
else
nn->reconfig_posted |= update;
done:
spin_unlock_bh(&nn->reconfig_lock);
}
/**
* nfp_net_reconfig() - Reconfigure the firmware
* @nn: NFP Net device to reconfigure
* @update: The value for the update field in the BAR config
*
* Write the update word to the BAR and ping the reconfig queue. The
* poll until the firmware has acknowledged the update by zeroing the
* update word.
*
* Return: Negative errno on error, 0 on success
*/
int nfp_net_reconfig(struct nfp_net *nn, u32 update)
{
bool cancelled_timer = false;
u32 pre_posted_requests;
int ret;
spin_lock_bh(&nn->reconfig_lock);
nn->reconfig_sync_present = true;
if (nn->reconfig_timer_active) {
del_timer(&nn->reconfig_timer);
nn->reconfig_timer_active = false;
cancelled_timer = true;
}
pre_posted_requests = nn->reconfig_posted;
nn->reconfig_posted = 0;
spin_unlock_bh(&nn->reconfig_lock);
if (cancelled_timer)
nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires);
/* Run the posted reconfigs which were issued before we started */
if (pre_posted_requests) {
nfp_net_reconfig_start(nn, pre_posted_requests);
nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
}
nfp_net_reconfig_start(nn, update);
ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
spin_lock_bh(&nn->reconfig_lock);
if (nn->reconfig_posted)
nfp_net_reconfig_start_async(nn, 0);
nn->reconfig_sync_present = false;
spin_unlock_bh(&nn->reconfig_lock);
return ret;
}
/* Interrupt configuration and handling
*/
/**
* nfp_net_irq_unmask() - Unmask automasked interrupt
* @nn: NFP Network structure
* @entry_nr: MSI-X table entry
*
* Clear the ICR for the IRQ entry.
*/
static void nfp_net_irq_unmask(struct nfp_net *nn, unsigned int entry_nr)
{
nn_writeb(nn, NFP_NET_CFG_ICR(entry_nr), NFP_NET_CFG_ICR_UNMASKED);
nn_pci_flush(nn);
}
/**
* nfp_net_irqs_alloc() - allocates MSI-X irqs
* @pdev: PCI device structure
* @irq_entries: Array to be initialized and used to hold the irq entries
* @min_irqs: Minimal acceptable number of interrupts
* @wanted_irqs: Target number of interrupts to allocate
*
* Return: Number of irqs obtained or 0 on error.
*/
unsigned int
nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries,
unsigned int min_irqs, unsigned int wanted_irqs)
{
unsigned int i;
int got_irqs;
for (i = 0; i < wanted_irqs; i++)
irq_entries[i].entry = i;
got_irqs = pci_enable_msix_range(pdev, irq_entries,
min_irqs, wanted_irqs);
if (got_irqs < 0) {
dev_err(&pdev->dev, "Failed to enable %d-%d MSI-X (err=%d)\n",
min_irqs, wanted_irqs, got_irqs);
return 0;
}
if (got_irqs < wanted_irqs)
dev_warn(&pdev->dev, "Unable to allocate %d IRQs got only %d\n",
wanted_irqs, got_irqs);
return got_irqs;
}
/**
* nfp_net_irqs_assign() - Assign interrupts allocated externally to netdev
* @nn: NFP Network structure
* @irq_entries: Table of allocated interrupts
* @n: Size of @irq_entries (number of entries to grab)
*
* After interrupts are allocated with nfp_net_irqs_alloc() this function
* should be called to assign them to a specific netdev (port).
*/
void
nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
unsigned int n)
{
struct nfp_net_dp *dp = &nn->dp;
nn->max_r_vecs = n - NFP_NET_NON_Q_VECTORS;
dp->num_r_vecs = nn->max_r_vecs;
memcpy(nn->irq_entries, irq_entries, sizeof(*irq_entries) * n);
if (dp->num_rx_rings > dp->num_r_vecs ||
dp->num_tx_rings > dp->num_r_vecs)
dev_warn(nn->dp.dev, "More rings (%d,%d) than vectors (%d).\n",
dp->num_rx_rings, dp->num_tx_rings,
dp->num_r_vecs);
dp->num_rx_rings = min(dp->num_r_vecs, dp->num_rx_rings);
dp->num_tx_rings = min(dp->num_r_vecs, dp->num_tx_rings);
dp->num_stack_tx_rings = dp->num_tx_rings;
}
/**
* nfp_net_irqs_disable() - Disable interrupts
* @pdev: PCI device structure
*
* Undoes what @nfp_net_irqs_alloc() does.
*/
void nfp_net_irqs_disable(struct pci_dev *pdev)
{
pci_disable_msix(pdev);
}
/**
* nfp_net_irq_rxtx() - Interrupt service routine for RX/TX rings.
* @irq: Interrupt
* @data: Opaque data structure
*
* Return: Indicate if the interrupt has been handled.
*/
static irqreturn_t nfp_net_irq_rxtx(int irq, void *data)
{
struct nfp_net_r_vector *r_vec = data;
napi_schedule_irqoff(&r_vec->napi);
/* The FW auto-masks any interrupt, either via the MASK bit in
* the MSI-X table or via the per entry ICR field. So there
* is no need to disable interrupts here.
*/
return IRQ_HANDLED;
}
bool nfp_net_link_changed_read_clear(struct nfp_net *nn)
{
unsigned long flags;
bool ret;
spin_lock_irqsave(&nn->link_status_lock, flags);
ret = nn->link_changed;
nn->link_changed = false;
spin_unlock_irqrestore(&nn->link_status_lock, flags);
return ret;
}
/**
* nfp_net_read_link_status() - Reread link status from control BAR
* @nn: NFP Network structure
*/
static void nfp_net_read_link_status(struct nfp_net *nn)
{
unsigned long flags;
bool link_up;
u32 sts;
spin_lock_irqsave(&nn->link_status_lock, flags);
sts = nn_readl(nn, NFP_NET_CFG_STS);
link_up = !!(sts & NFP_NET_CFG_STS_LINK);
if (nn->link_up == link_up)
goto out;
nn->link_up = link_up;
nn->link_changed = true;
if (nn->link_up) {
netif_carrier_on(nn->dp.netdev);
netdev_info(nn->dp.netdev, "NIC Link is Up\n");
} else {
netif_carrier_off(nn->dp.netdev);
netdev_info(nn->dp.netdev, "NIC Link is Down\n");
}
out:
spin_unlock_irqrestore(&nn->link_status_lock, flags);
}
/**
* nfp_net_irq_lsc() - Interrupt service routine for link state changes
* @irq: Interrupt
* @data: Opaque data structure
*
* Return: Indicate if the interrupt has been handled.
*/
static irqreturn_t nfp_net_irq_lsc(int irq, void *data)
{
struct nfp_net *nn = data;
struct msix_entry *entry;
entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX];
nfp_net_read_link_status(nn);
nfp_net_irq_unmask(nn, entry->entry);
return IRQ_HANDLED;
}
/**
* nfp_net_irq_exn() - Interrupt service routine for exceptions
* @irq: Interrupt
* @data: Opaque data structure
*
* Return: Indicate if the interrupt has been handled.
*/
static irqreturn_t nfp_net_irq_exn(int irq, void *data)
{
struct nfp_net *nn = data;
nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__);
/* XXX TO BE IMPLEMENTED */
return IRQ_HANDLED;
}
/**
* nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring
* @tx_ring: TX ring structure
* @r_vec: IRQ vector servicing this ring
* @idx: Ring index
*/
static void
nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring,
struct nfp_net_r_vector *r_vec, unsigned int idx)
{
struct nfp_net *nn = r_vec->nfp_net;
tx_ring->idx = idx;
tx_ring->r_vec = r_vec;
tx_ring->qcidx = tx_ring->idx * nn->stride_tx;
tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx);
}
/**
* nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring
* @rx_ring: RX ring structure
* @r_vec: IRQ vector servicing this ring
* @idx: Ring index
*/
static void
nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring,
struct nfp_net_r_vector *r_vec, unsigned int idx)
{
struct nfp_net *nn = r_vec->nfp_net;
rx_ring->idx = idx;
rx_ring->r_vec = r_vec;
rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx;
rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx);
}
/**
* nfp_net_vecs_init() - Assign IRQs and setup rvecs.
* @netdev: netdev structure
*/
static void nfp_net_vecs_init(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
struct nfp_net_r_vector *r_vec;
int r;
nn->lsc_handler = nfp_net_irq_lsc;
nn->exn_handler = nfp_net_irq_exn;
for (r = 0; r < nn->max_r_vecs; r++) {
struct msix_entry *entry;
entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r];
r_vec = &nn->r_vecs[r];
r_vec->nfp_net = nn;
r_vec->handler = nfp_net_irq_rxtx;
r_vec->irq_entry = entry->entry;
r_vec->irq_vector = entry->vector;
cpumask_set_cpu(r, &r_vec->affinity_mask);
}
}
/**
* nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN)
* @nn: NFP Network structure
* @ctrl_offset: Control BAR offset where IRQ configuration should be written
* @format: printf-style format to construct the interrupt name
* @name: Pointer to allocated space for interrupt name
* @name_sz: Size of space for interrupt name
* @vector_idx: Index of MSI-X vector used for this interrupt
* @handler: IRQ handler to register for this interrupt
*/
static int
nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset,
const char *format, char *name, size_t name_sz,
unsigned int vector_idx, irq_handler_t handler)
{
struct msix_entry *entry;
int err;
entry = &nn->irq_entries[vector_idx];
snprintf(name, name_sz, format, netdev_name(nn->dp.netdev));
err = request_irq(entry->vector, handler, 0, name, nn);
if (err) {
nn_err(nn, "Failed to request IRQ %d (err=%d).\n",
entry->vector, err);
return err;
}
nn_writeb(nn, ctrl_offset, entry->entry);
return 0;
}
/**
* nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN)
* @nn: NFP Network structure
* @ctrl_offset: Control BAR offset where IRQ configuration should be written
* @vector_idx: Index of MSI-X vector used for this interrupt
*/
static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset,
unsigned int vector_idx)
{
nn_writeb(nn, ctrl_offset, 0xff);
free_irq(nn->irq_entries[vector_idx].vector, nn);
}
/* Transmit
*
* One queue controller peripheral queue is used for transmit. The
* driver en-queues packets for transmit by advancing the write
* pointer. The device indicates that packets have transmitted by
* advancing the read pointer. The driver maintains a local copy of
* the read and write pointer in @struct nfp_net_tx_ring. The driver
* keeps @wr_p in sync with the queue controller write pointer and can
* determine how many packets have been transmitted by comparing its
* copy of the read pointer @rd_p with the read pointer maintained by
* the queue controller peripheral.
*/
/**
* nfp_net_tx_full() - Check if the TX ring is full
* @tx_ring: TX ring to check
* @dcnt: Number of descriptors that need to be enqueued (must be >= 1)
*
* This function checks, based on the *host copy* of read/write
* pointer if a given TX ring is full. The real TX queue may have
* some newly made available slots.
*
* Return: True if the ring is full.
*/
static int nfp_net_tx_full(struct nfp_net_tx_ring *tx_ring, int dcnt)
{
return (tx_ring->wr_p - tx_ring->rd_p) >= (tx_ring->cnt - dcnt);
}
/* Wrappers for deciding when to stop and restart TX queues */
static int nfp_net_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
{
return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4);
}
static int nfp_net_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
{
return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1);
}
/**
* nfp_net_tx_ring_stop() - stop tx ring
* @nd_q: netdev queue
* @tx_ring: driver tx queue structure
*
* Safely stop TX ring. Remember that while we are running .start_xmit()
* someone else may be cleaning the TX ring completions so we need to be
* extra careful here.
*/
static void nfp_net_tx_ring_stop(struct netdev_queue *nd_q,
struct nfp_net_tx_ring *tx_ring)
{
netif_tx_stop_queue(nd_q);
/* We can race with the TX completion out of NAPI so recheck */
smp_mb();
if (unlikely(nfp_net_tx_ring_should_wake(tx_ring)))
netif_tx_start_queue(nd_q);
}
/**
* nfp_net_tx_tso() - Set up Tx descriptor for LSO
* @r_vec: per-ring structure
* @txbuf: Pointer to driver soft TX descriptor
* @txd: Pointer to HW TX descriptor
* @skb: Pointer to SKB
*
* Set up Tx descriptor for LSO, do nothing for non-LSO skbs.
* Return error on packet header greater than maximum supported LSO header size.
*/
static void nfp_net_tx_tso(struct nfp_net_r_vector *r_vec,
struct nfp_net_tx_buf *txbuf,
struct nfp_net_tx_desc *txd, struct sk_buff *skb)
{
u32 hdrlen;
u16 mss;
if (!skb_is_gso(skb))
return;
if (!skb->encapsulation)
hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
else
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs;
txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1);
mss = skb_shinfo(skb)->gso_size & PCIE_DESC_TX_MSS_MASK;
txd->l4_offset = hdrlen;
txd->mss = cpu_to_le16(mss);
txd->flags |= PCIE_DESC_TX_LSO;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_lso++;
u64_stats_update_end(&r_vec->tx_sync);
}
/**
* nfp_net_tx_csum() - Set TX CSUM offload flags in TX descriptor
* @dp: NFP Net data path struct
* @r_vec: per-ring structure
* @txbuf: Pointer to driver soft TX descriptor
* @txd: Pointer to TX descriptor
* @skb: Pointer to SKB
*
* This function sets the TX checksum flags in the TX descriptor based
* on the configuration and the protocol of the packet to be transmitted.
*/
static void nfp_net_tx_csum(struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec,
struct nfp_net_tx_buf *txbuf,
struct nfp_net_tx_desc *txd, struct sk_buff *skb)
{
struct ipv6hdr *ipv6h;
struct iphdr *iph;
u8 l4_hdr;
if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
return;
if (skb->ip_summed != CHECKSUM_PARTIAL)
return;
txd->flags |= PCIE_DESC_TX_CSUM;
if (skb->encapsulation)
txd->flags |= PCIE_DESC_TX_ENCAP;
iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
if (iph->version == 4) {
txd->flags |= PCIE_DESC_TX_IP4_CSUM;
l4_hdr = iph->protocol;
} else if (ipv6h->version == 6) {
l4_hdr = ipv6h->nexthdr;
} else {
nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
return;
}
switch (l4_hdr) {
case IPPROTO_TCP:
txd->flags |= PCIE_DESC_TX_TCP_CSUM;
break;
case IPPROTO_UDP:
txd->flags |= PCIE_DESC_TX_UDP_CSUM;
break;
default:
nn_dp_warn(dp, "partial checksum but l4 proto=%x!\n", l4_hdr);
return;
}
u64_stats_update_begin(&r_vec->tx_sync);
if (skb->encapsulation)
r_vec->hw_csum_tx_inner += txbuf->pkt_cnt;
else
r_vec->hw_csum_tx += txbuf->pkt_cnt;
u64_stats_update_end(&r_vec->tx_sync);
}
static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
{
wmb();
nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add);
tx_ring->wr_ptr_add = 0;
}
/**
* nfp_net_tx() - Main transmit entry point
* @skb: SKB to transmit
* @netdev: netdev structure
*
* Return: NETDEV_TX_OK on success.
*/
static int nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
const struct skb_frag_struct *frag;
struct nfp_net_tx_desc *txd, txdg;
struct nfp_net_tx_ring *tx_ring;
struct nfp_net_r_vector *r_vec;
struct nfp_net_tx_buf *txbuf;
struct netdev_queue *nd_q;
struct nfp_net_dp *dp;
dma_addr_t dma_addr;
unsigned int fsize;
int f, nr_frags;
int wr_idx;
u16 qidx;
dp = &nn->dp;
qidx = skb_get_queue_mapping(skb);
tx_ring = &dp->tx_rings[qidx];
r_vec = tx_ring->r_vec;
nd_q = netdev_get_tx_queue(dp->netdev, qidx);
nr_frags = skb_shinfo(skb)->nr_frags;
if (unlikely(nfp_net_tx_full(tx_ring, nr_frags + 1))) {
nn_dp_warn(dp, "TX ring %d busy. wrp=%u rdp=%u\n",
qidx, tx_ring->wr_p, tx_ring->rd_p);
netif_tx_stop_queue(nd_q);
nfp_net_tx_xmit_more_flush(tx_ring);
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_busy++;
u64_stats_update_end(&r_vec->tx_sync);
return NETDEV_TX_BUSY;
}
/* Start with the head skbuf */
dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_free;
wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->skb = skb;
txbuf->dma_addr = dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = skb->len;
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = (nr_frags == 0) ? PCIE_DESC_TX_EOP : 0;
txd->dma_len = cpu_to_le16(skb_headlen(skb));
nfp_desc_set_dma_addr(txd, dma_addr);
txd->data_len = cpu_to_le16(skb->len);
txd->flags = 0;
txd->mss = 0;
txd->l4_offset = 0;
nfp_net_tx_tso(r_vec, txbuf, txd, skb);
nfp_net_tx_csum(dp, r_vec, txbuf, txd, skb);
if (skb_vlan_tag_present(skb) && dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN) {
txd->flags |= PCIE_DESC_TX_VLAN;
txd->vlan = cpu_to_le16(skb_vlan_tag_get(skb));
}
/* Gather DMA */
if (nr_frags > 0) {
/* all descs must match except for in addr, length and eop */
txdg = *txd;
for (f = 0; f < nr_frags; f++) {
frag = &skb_shinfo(skb)->frags[f];
fsize = skb_frag_size(frag);
dma_addr = skb_frag_dma_map(dp->dev, frag, 0,
fsize, DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_unmap;
wr_idx = (wr_idx + 1) & (tx_ring->cnt - 1);
tx_ring->txbufs[wr_idx].skb = skb;
tx_ring->txbufs[wr_idx].dma_addr = dma_addr;
tx_ring->txbufs[wr_idx].fidx = f;
txd = &tx_ring->txds[wr_idx];
*txd = txdg;
txd->dma_len = cpu_to_le16(fsize);
nfp_desc_set_dma_addr(txd, dma_addr);
txd->offset_eop =
(f == nr_frags - 1) ? PCIE_DESC_TX_EOP : 0;
}
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_gather++;
u64_stats_update_end(&r_vec->tx_sync);
}
netdev_tx_sent_queue(nd_q, txbuf->real_len);
tx_ring->wr_p += nr_frags + 1;
if (nfp_net_tx_ring_should_stop(tx_ring))
nfp_net_tx_ring_stop(nd_q, tx_ring);
tx_ring->wr_ptr_add += nr_frags + 1;
if (!skb->xmit_more || netif_xmit_stopped(nd_q))
nfp_net_tx_xmit_more_flush(tx_ring);
skb_tx_timestamp(skb);
return NETDEV_TX_OK;
err_unmap:
--f;
while (f >= 0) {
frag = &skb_shinfo(skb)->frags[f];
dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
tx_ring->txbufs[wr_idx].skb = NULL;
tx_ring->txbufs[wr_idx].dma_addr = 0;
tx_ring->txbufs[wr_idx].fidx = -2;
wr_idx = wr_idx - 1;
if (wr_idx < 0)
wr_idx += tx_ring->cnt;
}
dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
tx_ring->txbufs[wr_idx].skb = NULL;
tx_ring->txbufs[wr_idx].dma_addr = 0;
tx_ring->txbufs[wr_idx].fidx = -2;
err_free:
nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
nfp_net_tx_xmit_more_flush(tx_ring);
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_errors++;
u64_stats_update_end(&r_vec->tx_sync);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/**
* nfp_net_tx_complete() - Handled completed TX packets
* @tx_ring: TX ring structure
*
* Return: Number of completed TX descriptors
*/
static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
const struct skb_frag_struct *frag;
struct netdev_queue *nd_q;
u32 done_pkts = 0, done_bytes = 0;
struct sk_buff *skb;
int todo, nr_frags;
u32 qcp_rd_p;
int fidx;
int idx;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return;
if (qcp_rd_p > tx_ring->qcp_rd_p)
todo = qcp_rd_p - tx_ring->qcp_rd_p;
else
todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p;
while (todo--) {
idx = tx_ring->rd_p & (tx_ring->cnt - 1);
tx_ring->rd_p++;
skb = tx_ring->txbufs[idx].skb;
if (!skb)
continue;
nr_frags = skb_shinfo(skb)->nr_frags;
fidx = tx_ring->txbufs[idx].fidx;
if (fidx == -1) {
/* unmap head */
dma_unmap_single(dp->dev, tx_ring->txbufs[idx].dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
done_pkts += tx_ring->txbufs[idx].pkt_cnt;
done_bytes += tx_ring->txbufs[idx].real_len;
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[fidx];
dma_unmap_page(dp->dev, tx_ring->txbufs[idx].dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
}
/* check for last gather fragment */
if (fidx == nr_frags - 1)
dev_kfree_skb_any(skb);
tx_ring->txbufs[idx].dma_addr = 0;
tx_ring->txbufs[idx].skb = NULL;
tx_ring->txbufs[idx].fidx = -2;
}
tx_ring->qcp_rd_p = qcp_rd_p;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_bytes += done_bytes;
r_vec->tx_pkts += done_pkts;
u64_stats_update_end(&r_vec->tx_sync);
nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
if (nfp_net_tx_ring_should_wake(tx_ring)) {
/* Make sure TX thread will see updated tx_ring->rd_p */
smp_mb();
if (unlikely(netif_tx_queue_stopped(nd_q)))
netif_tx_wake_queue(nd_q);
}
WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
"TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
}
static void nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
u32 done_pkts = 0, done_bytes = 0;
int idx, todo;
u32 qcp_rd_p;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return;
if (qcp_rd_p > tx_ring->qcp_rd_p)
todo = qcp_rd_p - tx_ring->qcp_rd_p;
else
todo = qcp_rd_p + tx_ring->cnt - tx_ring->qcp_rd_p;
while (todo--) {
idx = tx_ring->rd_p & (tx_ring->cnt - 1);
tx_ring->rd_p++;
if (!tx_ring->txbufs[idx].frag)
continue;
nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[idx].dma_addr);
__free_page(virt_to_page(tx_ring->txbufs[idx].frag));
done_pkts++;
done_bytes += tx_ring->txbufs[idx].real_len;
tx_ring->txbufs[idx].dma_addr = 0;
tx_ring->txbufs[idx].frag = NULL;
tx_ring->txbufs[idx].fidx = -2;
}
tx_ring->qcp_rd_p = qcp_rd_p;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_bytes += done_bytes;
r_vec->tx_pkts += done_pkts;
u64_stats_update_end(&r_vec->tx_sync);
WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
"TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
}
/**
* nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers
* @dp: NFP Net data path struct
* @tx_ring: TX ring structure
*
* Assumes that the device is stopped
*/
static void
nfp_net_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
const struct skb_frag_struct *frag;
struct netdev_queue *nd_q;
while (tx_ring->rd_p != tx_ring->wr_p) {
struct nfp_net_tx_buf *tx_buf;
int idx;
idx = tx_ring->rd_p & (tx_ring->cnt - 1);
tx_buf = &tx_ring->txbufs[idx];
if (tx_ring == r_vec->xdp_ring) {
nfp_net_dma_unmap_rx(dp, tx_buf->dma_addr);
__free_page(virt_to_page(tx_ring->txbufs[idx].frag));
} else {
struct sk_buff *skb = tx_ring->txbufs[idx].skb;
int nr_frags = skb_shinfo(skb)->nr_frags;
if (tx_buf->fidx == -1) {
/* unmap head */
dma_unmap_single(dp->dev, tx_buf->dma_addr,
skb_headlen(skb),
DMA_TO_DEVICE);
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[tx_buf->fidx];
dma_unmap_page(dp->dev, tx_buf->dma_addr,
skb_frag_size(frag),
DMA_TO_DEVICE);
}
/* check for last gather fragment */
if (tx_buf->fidx == nr_frags - 1)
dev_kfree_skb_any(skb);
}
tx_buf->dma_addr = 0;
tx_buf->skb = NULL;
tx_buf->fidx = -2;
tx_ring->qcp_rd_p++;
tx_ring->rd_p++;
}
memset(tx_ring->txds, 0, sizeof(*tx_ring->txds) * tx_ring->cnt);
tx_ring->wr_p = 0;
tx_ring->rd_p = 0;
tx_ring->qcp_rd_p = 0;
tx_ring->wr_ptr_add = 0;
if (tx_ring == r_vec->xdp_ring)
return;
nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
netdev_tx_reset_queue(nd_q);
}
static void nfp_net_tx_timeout(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
int i;
for (i = 0; i < nn->dp.netdev->real_num_tx_queues; i++) {
if (!netif_tx_queue_stopped(netdev_get_tx_queue(netdev, i)))
continue;
nn_warn(nn, "TX timeout on ring: %d\n", i);
}
nn_warn(nn, "TX watchdog timeout\n");
}
/* Receive processing
*/
static unsigned int
nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp)
{
unsigned int fl_bufsz;
fl_bufsz = NFP_NET_RX_BUF_HEADROOM;
fl_bufsz += dp->rx_dma_off;
if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
fl_bufsz += NFP_NET_MAX_PREPEND;
else
fl_bufsz += dp->rx_offset;
fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu;
fl_bufsz = SKB_DATA_ALIGN(fl_bufsz);
fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
return fl_bufsz;
}
static void
nfp_net_free_frag(void *frag, bool xdp)
{
if (!xdp)
skb_free_frag(frag);
else
__free_page(virt_to_page(frag));
}
/**
* nfp_net_rx_alloc_one() - Allocate and map page frag for RX
* @dp: NFP Net data path struct
* @rx_ring: RX ring structure of the skb
* @dma_addr: Pointer to storage for DMA address (output param)
*
* This function will allcate a new page frag, map it for DMA.
*
* Return: allocated page frag or NULL on failure.
*/
static void *
nfp_net_rx_alloc_one(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog)
frag = netdev_alloc_frag(dp->fl_bufsz);
else
frag = page_address(alloc_page(GFP_KERNEL | __GFP_COLD));
if (!frag) {
nn_dp_warn(dp, "Failed to alloc receive page frag\n");
return NULL;
}
*dma_addr = nfp_net_dma_map_rx(dp, frag);
if (dma_mapping_error(dp->dev, *dma_addr)) {
nfp_net_free_frag(frag, dp->xdp_prog);
nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
return NULL;
}
return frag;
}
static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog)
frag = napi_alloc_frag(dp->fl_bufsz);
else
frag = page_address(alloc_page(GFP_ATOMIC | __GFP_COLD));
if (!frag) {
nn_dp_warn(dp, "Failed to alloc receive page frag\n");
return NULL;
}
*dma_addr = nfp_net_dma_map_rx(dp, frag);
if (dma_mapping_error(dp->dev, *dma_addr)) {
nfp_net_free_frag(frag, dp->xdp_prog);
nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
return NULL;
}
return frag;
}
/**
* nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings
* @dp: NFP Net data path struct
* @rx_ring: RX ring structure
* @frag: page fragment buffer
* @dma_addr: DMA address of skb mapping
*/
static void nfp_net_rx_give_one(const struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring,
void *frag, dma_addr_t dma_addr)
{
unsigned int wr_idx;
wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1);
/* Stash SKB and DMA address away */
rx_ring->rxbufs[wr_idx].frag = frag;
rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
/* Fill freelist descriptor */
rx_ring->rxds[wr_idx].fld.reserved = 0;
rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld,
dma_addr + dp->rx_dma_off);
rx_ring->wr_p++;
rx_ring->wr_ptr_add++;
if (rx_ring->wr_ptr_add >= NFP_NET_FL_BATCH) {
/* Update write pointer of the freelist queue. Make
* sure all writes are flushed before telling the hardware.
*/
wmb();
nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, rx_ring->wr_ptr_add);
rx_ring->wr_ptr_add = 0;
}
}
/**
* nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable
* @rx_ring: RX ring structure
*
* Warning: Do *not* call if ring buffers were never put on the FW freelist
* (i.e. device was not enabled)!
*/
static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
{
unsigned int wr_idx, last_idx;
/* Move the empty entry to the end of the list */
wr_idx = rx_ring->wr_p & (rx_ring->cnt - 1);
last_idx = rx_ring->cnt - 1;
rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr;
rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag;
rx_ring->rxbufs[last_idx].dma_addr = 0;
rx_ring->rxbufs[last_idx].frag = NULL;
memset(rx_ring->rxds, 0, sizeof(*rx_ring->rxds) * rx_ring->cnt);
rx_ring->wr_p = 0;
rx_ring->rd_p = 0;
rx_ring->wr_ptr_add = 0;
}
/**
* nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring
* @dp: NFP Net data path struct
* @rx_ring: RX ring to remove buffers from
*
* Assumes that the device is stopped and buffers are in [0, ring->cnt - 1)
* entries. After device is disabled nfp_net_rx_ring_reset() must be called
* to restore required ring geometry.
*/
static void
nfp_net_rx_ring_bufs_free(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
unsigned int i;
for (i = 0; i < rx_ring->cnt - 1; i++) {
/* NULL skb can only happen when initial filling of the ring
* fails to allocate enough buffers and calls here to free
* already allocated ones.
*/
if (!rx_ring->rxbufs[i].frag)
continue;
nfp_net_dma_unmap_rx(dp, rx_ring->rxbufs[i].dma_addr);
nfp_net_free_frag(rx_ring->rxbufs[i].frag, dp->xdp_prog);
rx_ring->rxbufs[i].dma_addr = 0;
rx_ring->rxbufs[i].frag = NULL;
}
}
/**
* nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW)
* @dp: NFP Net data path struct
* @rx_ring: RX ring to remove buffers from
*/
static int
nfp_net_rx_ring_bufs_alloc(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
struct nfp_net_rx_buf *rxbufs;
unsigned int i;
rxbufs = rx_ring->rxbufs;
for (i = 0; i < rx_ring->cnt - 1; i++) {
rxbufs[i].frag =
nfp_net_rx_alloc_one(dp, rx_ring, &rxbufs[i].dma_addr);
if (!rxbufs[i].frag) {
nfp_net_rx_ring_bufs_free(dp, rx_ring);
return -ENOMEM;
}
}
return 0;
}
/**
* nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW
* @dp: NFP Net data path struct
* @rx_ring: RX ring to fill
*/
static void
nfp_net_rx_ring_fill_freelist(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
unsigned int i;
for (i = 0; i < rx_ring->cnt - 1; i++)
nfp_net_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
rx_ring->rxbufs[i].dma_addr);
}
/**
* nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors
* @flags: RX descriptor flags field in CPU byte order
*/
static int nfp_net_rx_csum_has_errors(u16 flags)
{
u16 csum_all_checked, csum_all_ok;
csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
}
/**
* nfp_net_rx_csum() - set SKB checksum field based on RX descriptor flags
* @dp: NFP Net data path struct
* @r_vec: per-ring structure
* @rxd: Pointer to RX descriptor
* @skb: Pointer to SKB
*/
static void nfp_net_rx_csum(struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec,
struct nfp_net_rx_desc *rxd, struct sk_buff *skb)
{
skb_checksum_none_assert(skb);
if (!(dp->netdev->features & NETIF_F_RXCSUM))
return;
if (nfp_net_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_error++;
u64_stats_update_end(&r_vec->rx_sync);
return;
}
/* Assume that the firmware will never report inner CSUM_OK unless outer
* L4 headers were successfully parsed. FW will always report zero UDP
* checksum as CSUM_OK.
*/
if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
__skb_incr_checksum_unnecessary(skb);
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_ok++;
u64_stats_update_end(&r_vec->rx_sync);
}
if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
__skb_incr_checksum_unnecessary(skb);
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_inner_ok++;
u64_stats_update_end(&r_vec->rx_sync);
}
}
static void nfp_net_set_hash(struct net_device *netdev, struct sk_buff *skb,
unsigned int type, __be32 *hash)
{
if (!(netdev->features & NETIF_F_RXHASH))
return;
switch (type) {
case NFP_NET_RSS_IPV4:
case NFP_NET_RSS_IPV6:
case NFP_NET_RSS_IPV6_EX:
skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L3);
break;
default:
skb_set_hash(skb, get_unaligned_be32(hash), PKT_HASH_TYPE_L4);
break;
}
}
static void
nfp_net_set_hash_desc(struct net_device *netdev, struct sk_buff *skb,
void *data, struct nfp_net_rx_desc *rxd)
{
struct nfp_net_rx_hash *rx_hash = data;
if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
return;
nfp_net_set_hash(netdev, skb, get_unaligned_be32(&rx_hash->hash_type),
&rx_hash->hash);
}
static void *
nfp_net_parse_meta(struct net_device *netdev, struct sk_buff *skb,
void *data, int meta_len)
{
u32 meta_info;
meta_info = get_unaligned_be32(data);
data += 4;
while (meta_info) {
switch (meta_info & NFP_NET_META_FIELD_MASK) {
case NFP_NET_META_HASH:
meta_info >>= NFP_NET_META_FIELD_SIZE;
nfp_net_set_hash(netdev, skb,
meta_info & NFP_NET_META_FIELD_MASK,
(__be32 *)data);
data += 4;
break;
case NFP_NET_META_MARK:
skb->mark = get_unaligned_be32(data);
data += 4;
break;
default:
return NULL;
}
meta_info >>= NFP_NET_META_FIELD_SIZE;
}
return data;
}
static void
nfp_net_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
struct sk_buff *skb)
{
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_drops++;
u64_stats_update_end(&r_vec->rx_sync);
/* skb is build based on the frag, free_skb() would free the frag
* so to be able to reuse it we need an extra ref.
*/
if (skb && rxbuf && skb->head == rxbuf->frag)
page_ref_inc(virt_to_head_page(rxbuf->frag));
if (rxbuf)
nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
if (skb)
dev_kfree_skb_any(skb);
}
static bool
nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
struct nfp_net_tx_ring *tx_ring,
struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
unsigned int pkt_len)
{
struct nfp_net_tx_buf *txbuf;
struct nfp_net_tx_desc *txd;
dma_addr_t new_dma_addr;
void *new_frag;
int wr_idx;
if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, NULL);
return false;
}
new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf, NULL);
return false;
}
nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
wr_idx = tx_ring->wr_p & (tx_ring->cnt - 1);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->frag = rxbuf->frag;
txbuf->dma_addr = rxbuf->dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = pkt_len;
dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
pkt_len, DMA_BIDIRECTIONAL);
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = PCIE_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(pkt_len);
nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off);
txd->data_len = cpu_to_le16(pkt_len);
txd->flags = 0;
txd->mss = 0;
txd->l4_offset = 0;
tx_ring->wr_p++;
tx_ring->wr_ptr_add++;
return true;
}
static int nfp_net_run_xdp(struct bpf_prog *prog, void *data, void *hard_start,
unsigned int *off, unsigned int *len)
{
struct xdp_buff xdp;
void *orig_data;
int ret;
xdp.data_hard_start = hard_start;
xdp.data = data + *off;
xdp.data_end = data + *off + *len;
orig_data = xdp.data;
ret = bpf_prog_run_xdp(prog, &xdp);
*len -= xdp.data - orig_data;
*off += xdp.data - orig_data;
return ret;
}
/**
* nfp_net_rx() - receive up to @budget packets on @rx_ring
* @rx_ring: RX ring to receive from
* @budget: NAPI budget
*
* Note, this function is separated out from the napi poll function to
* more cleanly separate packet receive code from other bookkeeping
* functions performed in the napi poll function.
*
* Return: Number of packets received.
*/
static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
struct nfp_net_tx_ring *tx_ring;
struct bpf_prog *xdp_prog;
unsigned int true_bufsz;
struct sk_buff *skb;
int pkts_polled = 0;
int idx;
rcu_read_lock();
xdp_prog = READ_ONCE(dp->xdp_prog);
true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
tx_ring = r_vec->xdp_ring;
while (pkts_polled < budget) {
unsigned int meta_len, data_len, data_off, pkt_len;
u8 meta_prepend[NFP_NET_MAX_PREPEND];
struct nfp_net_rx_buf *rxbuf;
struct nfp_net_rx_desc *rxd;
dma_addr_t new_dma_addr;
void *new_frag;
u8 *meta;
idx = rx_ring->rd_p & (rx_ring->cnt - 1);
rxd = &rx_ring->rxds[idx];
if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
break;
/* Memory barrier to ensure that we won't do other reads
* before the DD bit.
*/
dma_rmb();
rx_ring->rd_p++;
pkts_polled++;
rxbuf = &rx_ring->rxbufs[idx];
/* < meta_len >
* <-- [rx_offset] -->
* ---------------------------------------------------------
* | [XX] | metadata | packet | XXXX |
* ---------------------------------------------------------
* <---------------- data_len --------------->
*
* The rx_offset is fixed for all packets, the meta_len can vary
* on a packet by packet basis. If rx_offset is set to zero
* (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
* buffer and is immediately followed by the packet (no [XX]).
*/
meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
data_len = le16_to_cpu(rxd->rxd.data_len);
pkt_len = data_len - meta_len;
if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
data_off = NFP_NET_RX_BUF_HEADROOM + meta_len;
else
data_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_offset;
data_off += dp->rx_dma_off;
/* Stats update */
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_pkts++;
r_vec->rx_bytes += pkt_len;
u64_stats_update_end(&r_vec->rx_sync);
/* Pointer to start of metadata */
meta = rxbuf->frag + data_off - meta_len;
if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
(dp->rx_offset && meta_len > dp->rx_offset))) {
nn_dp_warn(dp, "oversized RX packet metadata %u\n",
meta_len);
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
continue;
}
if (xdp_prog && !(rxd->rxd.flags & PCIE_DESC_RX_BPF &&
dp->bpf_offload_xdp)) {
unsigned int dma_off;
void *hard_start;
int act;
hard_start = rxbuf->frag + NFP_NET_RX_BUF_HEADROOM;
dma_off = data_off - NFP_NET_RX_BUF_HEADROOM;
dma_sync_single_for_cpu(dp->dev, rxbuf->dma_addr,
dma_off + pkt_len,
DMA_BIDIRECTIONAL);
/* Move prepend out of the way */
if (xdp_prog->xdp_adjust_head) {
memcpy(meta_prepend, meta, meta_len);
meta = meta_prepend;
}
act = nfp_net_run_xdp(xdp_prog, rxbuf->frag, hard_start,
&data_off, &pkt_len);
switch (act) {
case XDP_PASS:
break;
case XDP_TX:
dma_off = data_off - NFP_NET_RX_BUF_HEADROOM;
if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring,
tx_ring, rxbuf,
dma_off,
pkt_len)))
trace_xdp_exception(dp->netdev,
xdp_prog, act);
continue;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
trace_xdp_exception(dp->netdev, xdp_prog, act);
case XDP_DROP:
nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag,
rxbuf->dma_addr);
continue;
}
}
skb = build_skb(rxbuf->frag, true_bufsz);
if (unlikely(!skb)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
continue;
}
new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
continue;
}
nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
skb_reserve(skb, data_off);
skb_put(skb, pkt_len);
if (!dp->chained_metadata_format) {
nfp_net_set_hash_desc(dp->netdev, skb, meta, rxd);
} else if (meta_len) {
void *end;
end = nfp_net_parse_meta(dp->netdev, skb, meta,
meta_len);
if (unlikely(end != meta + meta_len)) {
nn_dp_warn(dp, "invalid RX packet metadata\n");
nfp_net_rx_drop(dp, r_vec, rx_ring, NULL, skb);
continue;
}
}
skb_record_rx_queue(skb, rx_ring->idx);
skb->protocol = eth_type_trans(skb, dp->netdev);
nfp_net_rx_csum(dp, r_vec, rxd, skb);
if (rxd->rxd.flags & PCIE_DESC_RX_VLAN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
le16_to_cpu(rxd->rxd.vlan));
napi_gro_receive(&rx_ring->r_vec->napi, skb);
}
if (xdp_prog && tx_ring->wr_ptr_add)
nfp_net_tx_xmit_more_flush(tx_ring);
rcu_read_unlock();
return pkts_polled;
}
/**
* nfp_net_poll() - napi poll function
* @napi: NAPI structure
* @budget: NAPI budget
*
* Return: number of packets polled.
*/
static int nfp_net_poll(struct napi_struct *napi, int budget)
{
struct nfp_net_r_vector *r_vec =
container_of(napi, struct nfp_net_r_vector, napi);
unsigned int pkts_polled = 0;
if (r_vec->tx_ring)
nfp_net_tx_complete(r_vec->tx_ring);
if (r_vec->rx_ring) {
pkts_polled = nfp_net_rx(r_vec->rx_ring, budget);
if (r_vec->xdp_ring)
nfp_net_xdp_complete(r_vec->xdp_ring);
}
if (pkts_polled < budget)
if (napi_complete_done(napi, pkts_polled))
nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
return pkts_polled;
}
/* Setup and Configuration
*/
/**
* nfp_net_tx_ring_free() - Free resources allocated to a TX ring
* @tx_ring: TX ring to free
*/
static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
kfree(tx_ring->txbufs);
if (tx_ring->txds)
dma_free_coherent(dp->dev, tx_ring->size,
tx_ring->txds, tx_ring->dma);
tx_ring->cnt = 0;
tx_ring->txbufs = NULL;
tx_ring->txds = NULL;
tx_ring->dma = 0;
tx_ring->size = 0;
}
/**
* nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
* @dp: NFP Net data path struct
* @tx_ring: TX Ring structure to allocate
* @is_xdp: True if ring will be used for XDP
*
* Return: 0 on success, negative errno otherwise.
*/
static int
nfp_net_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring,
bool is_xdp)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
int sz;
tx_ring->cnt = dp->txd_cnt;
tx_ring->size = sizeof(*tx_ring->txds) * tx_ring->cnt;
tx_ring->txds = dma_zalloc_coherent(dp->dev, tx_ring->size,
&tx_ring->dma, GFP_KERNEL);
if (!tx_ring->txds)
goto err_alloc;
sz = sizeof(*tx_ring->txbufs) * tx_ring->cnt;
tx_ring->txbufs = kzalloc(sz, GFP_KERNEL);
if (!tx_ring->txbufs)
goto err_alloc;
if (!is_xdp)
netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask,
tx_ring->idx);
return 0;
err_alloc:
nfp_net_tx_ring_free(tx_ring);
return -ENOMEM;
}
static int nfp_net_tx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
{
unsigned int r;
dp->tx_rings = kcalloc(dp->num_tx_rings, sizeof(*dp->tx_rings),
GFP_KERNEL);
if (!dp->tx_rings)
return -ENOMEM;
for (r = 0; r < dp->num_tx_rings; r++) {
int bias = 0;
if (r >= dp->num_stack_tx_rings)
bias = dp->num_stack_tx_rings;
nfp_net_tx_ring_init(&dp->tx_rings[r], &nn->r_vecs[r - bias],
r);
if (nfp_net_tx_ring_alloc(dp, &dp->tx_rings[r], bias))
goto err_free_prev;
}
return 0;
err_free_prev:
while (r--)
nfp_net_tx_ring_free(&dp->tx_rings[r]);
kfree(dp->tx_rings);
return -ENOMEM;
}
static void nfp_net_tx_rings_free(struct nfp_net_dp *dp)
{
unsigned int r;
for (r = 0; r < dp->num_tx_rings; r++)
nfp_net_tx_ring_free(&dp->tx_rings[r]);
kfree(dp->tx_rings);
}
/**
* nfp_net_rx_ring_free() - Free resources allocated to a RX ring
* @rx_ring: RX ring to free
*/
static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
kfree(rx_ring->rxbufs);
if (rx_ring->rxds)
dma_free_coherent(dp->dev, rx_ring->size,
rx_ring->rxds, rx_ring->dma);
rx_ring->cnt = 0;
rx_ring->rxbufs = NULL;
rx_ring->rxds = NULL;
rx_ring->dma = 0;
rx_ring->size = 0;
}
/**
* nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
* @dp: NFP Net data path struct
* @rx_ring: RX ring to allocate
*
* Return: 0 on success, negative errno otherwise.
*/
static int
nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring)
{
int sz;
rx_ring->cnt = dp->rxd_cnt;
rx_ring->size = sizeof(*rx_ring->rxds) * rx_ring->cnt;
rx_ring->rxds = dma_zalloc_coherent(dp->dev, rx_ring->size,
&rx_ring->dma, GFP_KERNEL);
if (!rx_ring->rxds)
goto err_alloc;
sz = sizeof(*rx_ring->rxbufs) * rx_ring->cnt;
rx_ring->rxbufs = kzalloc(sz, GFP_KERNEL);
if (!rx_ring->rxbufs)
goto err_alloc;
return 0;
err_alloc:
nfp_net_rx_ring_free(rx_ring);
return -ENOMEM;
}
static int nfp_net_rx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
{
unsigned int r;
dp->rx_rings = kcalloc(dp->num_rx_rings, sizeof(*dp->rx_rings),
GFP_KERNEL);
if (!dp->rx_rings)
return -ENOMEM;
for (r = 0; r < dp->num_rx_rings; r++) {
nfp_net_rx_ring_init(&dp->rx_rings[r], &nn->r_vecs[r], r);
if (nfp_net_rx_ring_alloc(dp, &dp->rx_rings[r]))
goto err_free_prev;
if (nfp_net_rx_ring_bufs_alloc(dp, &dp->rx_rings[r]))
goto err_free_ring;
}
return 0;
err_free_prev:
while (r--) {
nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
err_free_ring:
nfp_net_rx_ring_free(&dp->rx_rings[r]);
}
kfree(dp->rx_rings);
return -ENOMEM;
}
static void nfp_net_rx_rings_free(struct nfp_net_dp *dp)
{
unsigned int r;
for (r = 0; r < dp->num_rx_rings; r++) {
nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
nfp_net_rx_ring_free(&dp->rx_rings[r]);
}
kfree(dp->rx_rings);
}
static void
nfp_net_vector_assign_rings(struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec, int idx)
{
r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL;
r_vec->tx_ring =
idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL;
r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ?
&dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL;
}
static int
nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
int idx)
{
int err;
/* Setup NAPI */
netif_napi_add(nn->dp.netdev, &r_vec->napi,
nfp_net_poll, NAPI_POLL_WEIGHT);
snprintf(r_vec->name, sizeof(r_vec->name),
"%s-rxtx-%d", nn->dp.netdev->name, idx);
err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name,
r_vec);
if (err) {
netif_napi_del(&r_vec->napi);
nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector);
return err;
}
disable_irq(r_vec->irq_vector);
irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);
nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector,
r_vec->irq_entry);
return 0;
}
static void
nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
{
irq_set_affinity_hint(r_vec->irq_vector, NULL);
netif_napi_del(&r_vec->napi);
free_irq(r_vec->irq_vector, r_vec);
}
/**
* nfp_net_rss_write_itbl() - Write RSS indirection table to device
* @nn: NFP Net device to reconfigure
*/
void nfp_net_rss_write_itbl(struct nfp_net *nn)
{
int i;
for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4)
nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i,
get_unaligned_le32(nn->rss_itbl + i));
}
/**
* nfp_net_rss_write_key() - Write RSS hash key to device
* @nn: NFP Net device to reconfigure
*/
void nfp_net_rss_write_key(struct nfp_net *nn)
{
int i;
for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4)
nn_writel(nn, NFP_NET_CFG_RSS_KEY + i,
get_unaligned_le32(nn->rss_key + i));
}
/**
* nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW
* @nn: NFP Net device to reconfigure
*/
void nfp_net_coalesce_write_cfg(struct nfp_net *nn)
{
u8 i;
u32 factor;
u32 value;
/* Compute factor used to convert coalesce '_usecs' parameters to
* ME timestamp ticks. There are 16 ME clock cycles for each timestamp
* count.
*/
factor = nn->me_freq_mhz / 16;
/* copy RX interrupt coalesce parameters */
value = (nn->rx_coalesce_max_frames << 16) |
(factor * nn->rx_coalesce_usecs);
for (i = 0; i < nn->dp.num_rx_rings; i++)
nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value);
/* copy TX interrupt coalesce parameters */
value = (nn->tx_coalesce_max_frames << 16) |
(factor * nn->tx_coalesce_usecs);
for (i = 0; i < nn->dp.num_tx_rings; i++)
nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value);
}
/**
* nfp_net_write_mac_addr() - Write mac address to the device control BAR
* @nn: NFP Net device to reconfigure
*
* Writes the MAC address from the netdev to the device control BAR. Does not
* perform the required reconfig. We do a bit of byte swapping dance because
* firmware is LE.
*/
static void nfp_net_write_mac_addr(struct nfp_net *nn)
{
nn_writel(nn, NFP_NET_CFG_MACADDR + 0,
get_unaligned_be32(nn->dp.netdev->dev_addr));
nn_writew(nn, NFP_NET_CFG_MACADDR + 6,
get_unaligned_be16(nn->dp.netdev->dev_addr + 4));
}
static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx)
{
nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0);
nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0);
nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0);
nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0);
nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0);
nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0);
}
/**
* nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
{
u32 new_ctrl, update;
unsigned int r;
int err;
new_ctrl = nn->dp.ctrl;
new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE;
update = NFP_NET_CFG_UPDATE_GEN;
update |= NFP_NET_CFG_UPDATE_MSIX;
update |= NFP_NET_CFG_UPDATE_RING;
if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG;
nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, update);
if (err)
nn_err(nn, "Could not disable device: %d\n", err);
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]);
for (r = 0; r < nn->dp.num_tx_rings; r++)
nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]);
for (r = 0; r < nn->dp.num_r_vecs; r++)
nfp_net_vec_clear_ring_data(nn, r);
nn->dp.ctrl = new_ctrl;
}
static void
nfp_net_rx_ring_hw_cfg_write(struct nfp_net *nn,
struct nfp_net_rx_ring *rx_ring, unsigned int idx)
{
/* Write the DMA address, size and MSI-X info to the device */
nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), rx_ring->dma);
nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(rx_ring->cnt));
nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), rx_ring->r_vec->irq_entry);
}
static void
nfp_net_tx_ring_hw_cfg_write(struct nfp_net *nn,
struct nfp_net_tx_ring *tx_ring, unsigned int idx)
{
nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), tx_ring->dma);
nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(tx_ring->cnt));
nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), tx_ring->r_vec->irq_entry);
}
/**
* nfp_net_set_config_and_enable() - Write control BAR and enable NFP
* @nn: NFP Net device to reconfigure
*/
static int nfp_net_set_config_and_enable(struct nfp_net *nn)
{
u32 new_ctrl, update = 0;
unsigned int r;
int err;
new_ctrl = nn->dp.ctrl;
if (nn->cap & NFP_NET_CFG_CTRL_RSS) {
nfp_net_rss_write_key(nn);
nfp_net_rss_write_itbl(nn);
nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
update |= NFP_NET_CFG_UPDATE_RSS;
}
if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
nfp_net_coalesce_write_cfg(nn);
new_ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
update |= NFP_NET_CFG_UPDATE_IRQMOD;
}
for (r = 0; r < nn->dp.num_tx_rings; r++)
nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r);
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r);
nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->dp.num_tx_rings == 64 ?
0xffffffffffffffffULL : ((u64)1 << nn->dp.num_tx_rings) - 1);
nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->dp.num_rx_rings == 64 ?
0xffffffffffffffffULL : ((u64)1 << nn->dp.num_rx_rings) - 1);
nfp_net_write_mac_addr(nn);
nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.netdev->mtu);
nn_writel(nn, NFP_NET_CFG_FLBUFSZ,
nn->dp.fl_bufsz - NFP_NET_RX_BUF_NON_DATA);
/* Enable device */
new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
update |= NFP_NET_CFG_UPDATE_GEN;
update |= NFP_NET_CFG_UPDATE_MSIX;
update |= NFP_NET_CFG_UPDATE_RING;
if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, update);
if (err) {
nfp_net_clear_config_and_disable(nn);
return err;
}
nn->dp.ctrl = new_ctrl;
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]);
/* Since reconfiguration requests while NFP is down are ignored we
* have to wipe the entire VXLAN configuration and reinitialize it.
*/
if (nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN) {
memset(&nn->vxlan_ports, 0, sizeof(nn->vxlan_ports));
memset(&nn->vxlan_usecnt, 0, sizeof(nn->vxlan_usecnt));
udp_tunnel_get_rx_info(nn->dp.netdev);
}
return 0;
}
/**
* nfp_net_open_stack() - Start the device from stack's perspective
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_open_stack(struct nfp_net *nn)
{
unsigned int r;
for (r = 0; r < nn->dp.num_r_vecs; r++) {
napi_enable(&nn->r_vecs[r].napi);
enable_irq(nn->r_vecs[r].irq_vector);
}
netif_tx_wake_all_queues(nn->dp.netdev);
enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
nfp_net_read_link_status(nn);
}
static int nfp_net_netdev_open(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
int err, r;
/* Step 1: Allocate resources for rings and the like
* - Request interrupts
* - Allocate RX and TX ring resources
* - Setup initial RSS table
*/
err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn",
nn->exn_name, sizeof(nn->exn_name),
NFP_NET_IRQ_EXN_IDX, nn->exn_handler);
if (err)
return err;
err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
nn->lsc_name, sizeof(nn->lsc_name),
NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
if (err)
goto err_free_exn;
disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
for (r = 0; r < nn->dp.num_r_vecs; r++) {
err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
if (err)
goto err_cleanup_vec_p;
}
err = nfp_net_rx_rings_prepare(nn, &nn->dp);
if (err)
goto err_cleanup_vec;
err = nfp_net_tx_rings_prepare(nn, &nn->dp);
if (err)
goto err_free_rx_rings;
for (r = 0; r < nn->max_r_vecs; r++)
nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);
err = netif_set_real_num_tx_queues(netdev, nn->dp.num_stack_tx_rings);
if (err)
goto err_free_rings;
err = netif_set_real_num_rx_queues(netdev, nn->dp.num_rx_rings);
if (err)
goto err_free_rings;
/* Step 2: Configure the NFP
* - Enable rings from 0 to tx_rings/rx_rings - 1.
* - Write MAC address (in case it changed)
* - Set the MTU
* - Set the Freelist buffer size
* - Enable the FW
*/
err = nfp_net_set_config_and_enable(nn);
if (err)
goto err_free_rings;
/* Step 3: Enable for kernel
* - put some freelist descriptors on each RX ring
* - enable NAPI on each ring
* - enable all TX queues
* - set link state
*/
nfp_net_open_stack(nn);
return 0;
err_free_rings:
nfp_net_tx_rings_free(&nn->dp);
err_free_rx_rings:
nfp_net_rx_rings_free(&nn->dp);
err_cleanup_vec:
r = nn->dp.num_r_vecs;
err_cleanup_vec_p:
while (r--)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
err_free_exn:
nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
return err;
}
/**
* nfp_net_close_stack() - Quiescent the stack (part of close)
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_close_stack(struct nfp_net *nn)
{
unsigned int r;
disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
netif_carrier_off(nn->dp.netdev);
nn->link_up = false;
for (r = 0; r < nn->dp.num_r_vecs; r++) {
disable_irq(nn->r_vecs[r].irq_vector);
napi_disable(&nn->r_vecs[r].napi);
}
netif_tx_disable(nn->dp.netdev);
}
/**
* nfp_net_close_free_all() - Free all runtime resources
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_close_free_all(struct nfp_net *nn)
{
unsigned int r;
for (r = 0; r < nn->dp.num_rx_rings; r++) {
nfp_net_rx_ring_bufs_free(&nn->dp, &nn->dp.rx_rings[r]);
nfp_net_rx_ring_free(&nn->dp.rx_rings[r]);
}
for (r = 0; r < nn->dp.num_tx_rings; r++)
nfp_net_tx_ring_free(&nn->dp.tx_rings[r]);
for (r = 0; r < nn->dp.num_r_vecs; r++)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
kfree(nn->dp.rx_rings);
kfree(nn->dp.tx_rings);
nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
}
/**
* nfp_net_netdev_close() - Called when the device is downed
* @netdev: netdev structure
*/
static int nfp_net_netdev_close(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
/* Step 1: Disable RX and TX rings from the Linux kernel perspective
*/
nfp_net_close_stack(nn);
/* Step 2: Tell NFP
*/
nfp_net_clear_config_and_disable(nn);
/* Step 3: Free resources
*/
nfp_net_close_free_all(nn);
nn_dbg(nn, "%s down", netdev->name);
return 0;
}
static void nfp_net_set_rx_mode(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
u32 new_ctrl;
new_ctrl = nn->dp.ctrl;
if (netdev->flags & IFF_PROMISC) {
if (nn->cap & NFP_NET_CFG_CTRL_PROMISC)
new_ctrl |= NFP_NET_CFG_CTRL_PROMISC;
else
nn_warn(nn, "FW does not support promiscuous mode\n");
} else {
new_ctrl &= ~NFP_NET_CFG_CTRL_PROMISC;
}
if (new_ctrl == nn->dp.ctrl)
return;
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_GEN);
nn->dp.ctrl = new_ctrl;
}
static void nfp_net_rss_init_itbl(struct nfp_net *nn)
{
int i;
for (i = 0; i < sizeof(nn->rss_itbl); i++)
nn->rss_itbl[i] =
ethtool_rxfh_indir_default(i, nn->dp.num_rx_rings);
}
static void nfp_net_dp_swap(struct nfp_net *nn, struct nfp_net_dp *dp)
{
struct nfp_net_dp new_dp = *dp;
*dp = nn->dp;
nn->dp = new_dp;
nn->dp.netdev->mtu = new_dp.mtu;
if (!netif_is_rxfh_configured(nn->dp.netdev))
nfp_net_rss_init_itbl(nn);
}
static int nfp_net_dp_swap_enable(struct nfp_net *nn, struct nfp_net_dp *dp)
{
unsigned int r;
int err;
nfp_net_dp_swap(nn, dp);
for (r = 0; r < nn->max_r_vecs; r++)
nfp_net_vector_assign_rings(&nn->dp, &nn->r_vecs[r], r);
err = netif_set_real_num_rx_queues(nn->dp.netdev, nn->dp.num_rx_rings);
if (err)
return err;
if (nn->dp.netdev->real_num_tx_queues != nn->dp.num_stack_tx_rings) {
err = netif_set_real_num_tx_queues(nn->dp.netdev,
nn->dp.num_stack_tx_rings);
if (err)
return err;
}
return nfp_net_set_config_and_enable(nn);
}
struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn)
{
struct nfp_net_dp *new;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
return NULL;
*new = nn->dp;
/* Clear things which need to be recomputed */
new->fl_bufsz = 0;
new->tx_rings = NULL;
new->rx_rings = NULL;
new->num_r_vecs = 0;
new->num_stack_tx_rings = 0;
return new;
}
static int nfp_net_check_config(struct nfp_net *nn, struct nfp_net_dp *dp)
{
/* XDP-enabled tests */
if (!dp->xdp_prog)
return 0;
if (dp->fl_bufsz > PAGE_SIZE) {
nn_warn(nn, "MTU too large w/ XDP enabled\n");
return -EINVAL;
}
if (dp->num_tx_rings > nn->max_tx_rings) {
nn_warn(nn, "Insufficient number of TX rings w/ XDP enabled\n");
return -EINVAL;
}
return 0;
}
int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *dp)
{
int r, err;
dp->fl_bufsz = nfp_net_calc_fl_bufsz(dp);
dp->num_stack_tx_rings = dp->num_tx_rings;
if (dp->xdp_prog)
dp->num_stack_tx_rings -= dp->num_rx_rings;
dp->num_r_vecs = max(dp->num_rx_rings, dp->num_stack_tx_rings);
err = nfp_net_check_config(nn, dp);
if (err)
goto exit_free_dp;
if (!netif_running(dp->netdev)) {
nfp_net_dp_swap(nn, dp);
err = 0;
goto exit_free_dp;
}
/* Prepare new rings */
for (r = nn->dp.num_r_vecs; r < dp->num_r_vecs; r++) {
err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
if (err) {
dp->num_r_vecs = r;
goto err_cleanup_vecs;
}
}
err = nfp_net_rx_rings_prepare(nn, dp);
if (err)
goto err_cleanup_vecs;
err = nfp_net_tx_rings_prepare(nn, dp);
if (err)
goto err_free_rx;
/* Stop device, swap in new rings, try to start the firmware */
nfp_net_close_stack(nn);
nfp_net_clear_config_and_disable(nn);
err = nfp_net_dp_swap_enable(nn, dp);
if (err) {
int err2;
nfp_net_clear_config_and_disable(nn);
/* Try with old configuration and old rings */
err2 = nfp_net_dp_swap_enable(nn, dp);
if (err2)
nn_err(nn, "Can't restore ring config - FW communication failed (%d,%d)\n",
err, err2);
}
for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
nfp_net_rx_rings_free(dp);
nfp_net_tx_rings_free(dp);
nfp_net_open_stack(nn);
exit_free_dp:
kfree(dp);
return err;
err_free_rx:
nfp_net_rx_rings_free(dp);
err_cleanup_vecs:
for (r = dp->num_r_vecs - 1; r >= nn->dp.num_r_vecs; r--)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
kfree(dp);
return err;
}
static int nfp_net_change_mtu(struct net_device *netdev, int new_mtu)
{
struct nfp_net *nn = netdev_priv(netdev);
struct nfp_net_dp *dp;
dp = nfp_net_clone_dp(nn);
if (!dp)
return -ENOMEM;
dp->mtu = new_mtu;
return nfp_net_ring_reconfig(nn, dp);
}
static void nfp_net_stat64(struct net_device *netdev,
struct rtnl_link_stats64 *stats)
{
struct nfp_net *nn = netdev_priv(netdev);
int r;
for (r = 0; r < nn->dp.num_r_vecs; r++) {
struct nfp_net_r_vector *r_vec = &nn->r_vecs[r];
u64 data[3];
unsigned int start;
do {
start = u64_stats_fetch_begin(&r_vec->rx_sync);
data[0] = r_vec->rx_pkts;
data[1] = r_vec->rx_bytes;
data[2] = r_vec->rx_drops;
} while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
stats->rx_packets += data[0];
stats->rx_bytes += data[1];
stats->rx_dropped += data[2];
do {
start = u64_stats_fetch_begin(&r_vec->tx_sync);
data[0] = r_vec->tx_pkts;
data[1] = r_vec->tx_bytes;
data[2] = r_vec->tx_errors;
} while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
stats->tx_packets += data[0];
stats->tx_bytes += data[1];
stats->tx_errors += data[2];
}
}
static bool nfp_net_ebpf_capable(struct nfp_net *nn)
{
if (nn->cap & NFP_NET_CFG_CTRL_BPF &&
nn_readb(nn, NFP_NET_CFG_BPF_ABI) == NFP_NET_BPF_ABI)
return true;
return false;
}
static int
nfp_net_setup_tc(struct net_device *netdev, u32 handle, __be16 proto,
struct tc_to_netdev *tc)
{
struct nfp_net *nn = netdev_priv(netdev);
if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS))
return -ENOTSUPP;
if (proto != htons(ETH_P_ALL))
return -ENOTSUPP;
if (tc->type == TC_SETUP_CLSBPF && nfp_net_ebpf_capable(nn)) {
if (!nn->dp.bpf_offload_xdp)
return nfp_net_bpf_offload(nn, tc->cls_bpf);
else
return -EBUSY;
}
return -EINVAL;
}
static int nfp_net_set_features(struct net_device *netdev,
netdev_features_t features)
{
netdev_features_t changed = netdev->features ^ features;
struct nfp_net *nn = netdev_priv(netdev);
u32 new_ctrl;
int err;
/* Assume this is not called with features we have not advertised */
new_ctrl = nn->dp.ctrl;
if (changed & NETIF_F_RXCSUM) {
if (features & NETIF_F_RXCSUM)
new_ctrl |= NFP_NET_CFG_CTRL_RXCSUM;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_RXCSUM;
}
if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) {
if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
new_ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_TXCSUM;
}
if (changed & (NETIF_F_TSO | NETIF_F_TSO6)) {
if (features & (NETIF_F_TSO | NETIF_F_TSO6))
new_ctrl |= NFP_NET_CFG_CTRL_LSO;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_LSO;
}
if (changed & NETIF_F_HW_VLAN_CTAG_RX) {
if (features & NETIF_F_HW_VLAN_CTAG_RX)
new_ctrl |= NFP_NET_CFG_CTRL_RXVLAN;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_RXVLAN;
}
if (changed & NETIF_F_HW_VLAN_CTAG_TX) {
if (features & NETIF_F_HW_VLAN_CTAG_TX)
new_ctrl |= NFP_NET_CFG_CTRL_TXVLAN;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_TXVLAN;
}
if (changed & NETIF_F_SG) {
if (features & NETIF_F_SG)
new_ctrl |= NFP_NET_CFG_CTRL_GATHER;
else
new_ctrl &= ~NFP_NET_CFG_CTRL_GATHER;
}
if (changed & NETIF_F_HW_TC && nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) {
nn_err(nn, "Cannot disable HW TC offload while in use\n");
return -EBUSY;
}
nn_dbg(nn, "Feature change 0x%llx -> 0x%llx (changed=0x%llx)\n",
netdev->features, features, changed);
if (new_ctrl == nn->dp.ctrl)
return 0;
nn_dbg(nn, "NIC ctrl: 0x%x -> 0x%x\n", nn->dp.ctrl, new_ctrl);
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_GEN);
if (err)
return err;
nn->dp.ctrl = new_ctrl;
return 0;
}
static netdev_features_t
nfp_net_features_check(struct sk_buff *skb, struct net_device *dev,
netdev_features_t features)
{
u8 l4_hdr;
/* We can't do TSO over double tagged packets (802.1AD) */
features &= vlan_features_check(skb, features);
if (!skb->encapsulation)
return features;
/* Ensure that inner L4 header offset fits into TX descriptor field */
if (skb_is_gso(skb)) {
u32 hdrlen;
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ))
features &= ~NETIF_F_GSO_MASK;
}
/* VXLAN/GRE check */
switch (vlan_get_protocol(skb)) {
case htons(ETH_P_IP):
l4_hdr = ip_hdr(skb)->protocol;
break;
case htons(ETH_P_IPV6):
l4_hdr = ipv6_hdr(skb)->nexthdr;
break;
default:
return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}
if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
skb->inner_protocol != htons(ETH_P_TEB) ||
(l4_hdr != IPPROTO_UDP && l4_hdr != IPPROTO_GRE) ||
(l4_hdr == IPPROTO_UDP &&
(skb_inner_mac_header(skb) - skb_transport_header(skb) !=
sizeof(struct udphdr) + sizeof(struct vxlanhdr))))
return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
return features;
}
static int
nfp_net_get_phys_port_name(struct net_device *netdev, char *name, size_t len)
{
struct nfp_net *nn = netdev_priv(netdev);
int err;
if (!nn->eth_port)
return -EOPNOTSUPP;
if (!nn->eth_port->is_split)
err = snprintf(name, len, "p%d", nn->eth_port->label_port);
else
err = snprintf(name, len, "p%ds%d", nn->eth_port->label_port,
nn->eth_port->label_subport);
if (err >= len)
return -EINVAL;
return 0;
}
/**
* nfp_net_set_vxlan_port() - set vxlan port in SW and reconfigure HW
* @nn: NFP Net device to reconfigure
* @idx: Index into the port table where new port should be written
* @port: UDP port to configure (pass zero to remove VXLAN port)
*/
static void nfp_net_set_vxlan_port(struct nfp_net *nn, int idx, __be16 port)
{
int i;
nn->vxlan_ports[idx] = port;
if (!(nn->dp.ctrl & NFP_NET_CFG_CTRL_VXLAN))
return;
BUILD_BUG_ON(NFP_NET_N_VXLAN_PORTS & 1);
for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i += 2)
nn_writel(nn, NFP_NET_CFG_VXLAN_PORT + i * sizeof(port),
be16_to_cpu(nn->vxlan_ports[i + 1]) << 16 |
be16_to_cpu(nn->vxlan_ports[i]));
nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_VXLAN);
}
/**
* nfp_net_find_vxlan_idx() - find table entry of the port or a free one
* @nn: NFP Network structure
* @port: UDP port to look for
*
* Return: if the port is already in the table -- it's position;
* if the port is not in the table -- free position to use;
* if the table is full -- -ENOSPC.
*/
static int nfp_net_find_vxlan_idx(struct nfp_net *nn, __be16 port)
{
int i, free_idx = -ENOSPC;
for (i = 0; i < NFP_NET_N_VXLAN_PORTS; i++) {
if (nn->vxlan_ports[i] == port)
return i;
if (!nn->vxlan_usecnt[i])
free_idx = i;
}
return free_idx;
}
static void nfp_net_add_vxlan_port(struct net_device *netdev,
struct udp_tunnel_info *ti)
{
struct nfp_net *nn = netdev_priv(netdev);
int idx;
if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
return;
idx = nfp_net_find_vxlan_idx(nn, ti->port);
if (idx == -ENOSPC)
return;
if (!nn->vxlan_usecnt[idx]++)
nfp_net_set_vxlan_port(nn, idx, ti->port);
}
static void nfp_net_del_vxlan_port(struct net_device *netdev,
struct udp_tunnel_info *ti)
{
struct nfp_net *nn = netdev_priv(netdev);
int idx;
if (ti->type != UDP_TUNNEL_TYPE_VXLAN)
return;
idx = nfp_net_find_vxlan_idx(nn, ti->port);
if (idx == -ENOSPC || !nn->vxlan_usecnt[idx])
return;
if (!--nn->vxlan_usecnt[idx])
nfp_net_set_vxlan_port(nn, idx, 0);
}
static int nfp_net_xdp_offload(struct nfp_net *nn, struct bpf_prog *prog)
{
struct tc_cls_bpf_offload cmd = {
.prog = prog,
};
int ret;
if (!nfp_net_ebpf_capable(nn))
return -EINVAL;
if (nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) {
if (!nn->dp.bpf_offload_xdp)
return prog ? -EBUSY : 0;
cmd.command = prog ? TC_CLSBPF_REPLACE : TC_CLSBPF_DESTROY;
} else {
if (!prog)
return 0;
cmd.command = TC_CLSBPF_ADD;
}
ret = nfp_net_bpf_offload(nn, &cmd);
/* Stop offload if replace not possible */
if (ret && cmd.command == TC_CLSBPF_REPLACE)
nfp_net_xdp_offload(nn, NULL);
nn->dp.bpf_offload_xdp = prog && !ret;
return ret;
}
static int nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog)
{
struct bpf_prog *old_prog = nn->dp.xdp_prog;
struct nfp_net_dp *dp;
int err;
if (!prog && !nn->dp.xdp_prog)
return 0;
if (prog && nn->dp.xdp_prog) {
prog = xchg(&nn->dp.xdp_prog, prog);
bpf_prog_put(prog);
nfp_net_xdp_offload(nn, nn->dp.xdp_prog);
return 0;
}
dp = nfp_net_clone_dp(nn);
if (!dp)
return -ENOMEM;
dp->xdp_prog = prog;
dp->num_tx_rings += prog ? nn->dp.num_rx_rings : -nn->dp.num_rx_rings;
dp->rx_dma_dir = prog ? DMA_BIDIRECTIONAL : DMA_FROM_DEVICE;
if (prog)
dp->rx_dma_off = XDP_PACKET_HEADROOM -
(nn->dp.rx_offset ?: NFP_NET_MAX_PREPEND);
else
dp->rx_dma_off = 0;
/* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
err = nfp_net_ring_reconfig(nn, dp);
if (err)
return err;
if (old_prog)
bpf_prog_put(old_prog);
nfp_net_xdp_offload(nn, nn->dp.xdp_prog);
return 0;
}
static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
{
struct nfp_net *nn = netdev_priv(netdev);
switch (xdp->command) {
case XDP_SETUP_PROG:
return nfp_net_xdp_setup(nn, xdp->prog);
case XDP_QUERY_PROG:
xdp->prog_attached = !!nn->dp.xdp_prog;
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops nfp_net_netdev_ops = {
.ndo_open = nfp_net_netdev_open,
.ndo_stop = nfp_net_netdev_close,
.ndo_start_xmit = nfp_net_tx,
.ndo_get_stats64 = nfp_net_stat64,
.ndo_setup_tc = nfp_net_setup_tc,
.ndo_tx_timeout = nfp_net_tx_timeout,
.ndo_set_rx_mode = nfp_net_set_rx_mode,
.ndo_change_mtu = nfp_net_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_set_features = nfp_net_set_features,
.ndo_features_check = nfp_net_features_check,
.ndo_get_phys_port_name = nfp_net_get_phys_port_name,
.ndo_udp_tunnel_add = nfp_net_add_vxlan_port,
.ndo_udp_tunnel_del = nfp_net_del_vxlan_port,
.ndo_xdp = nfp_net_xdp,
};
/**
* nfp_net_info() - Print general info about the NIC
* @nn: NFP Net device to reconfigure
*/
void nfp_net_info(struct nfp_net *nn)
{
nn_info(nn, "Netronome NFP-6xxx %sNetdev: TxQs=%d/%d RxQs=%d/%d\n",
nn->dp.is_vf ? "VF " : "",
nn->dp.num_tx_rings, nn->max_tx_rings,
nn->dp.num_rx_rings, nn->max_rx_rings);
nn_info(nn, "VER: %d.%d.%d.%d, Maximum supported MTU: %d\n",
nn->fw_ver.resv, nn->fw_ver.class,
nn->fw_ver.major, nn->fw_ver.minor,
nn->max_mtu);
nn_info(nn, "CAP: %#x %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
nn->cap,
nn->cap & NFP_NET_CFG_CTRL_PROMISC ? "PROMISC " : "",
nn->cap & NFP_NET_CFG_CTRL_L2BC ? "L2BCFILT " : "",
nn->cap & NFP_NET_CFG_CTRL_L2MC ? "L2MCFILT " : "",
nn->cap & NFP_NET_CFG_CTRL_RXCSUM ? "RXCSUM " : "",
nn->cap & NFP_NET_CFG_CTRL_TXCSUM ? "TXCSUM " : "",
nn->cap & NFP_NET_CFG_CTRL_RXVLAN ? "RXVLAN " : "",
nn->cap & NFP_NET_CFG_CTRL_TXVLAN ? "TXVLAN " : "",
nn->cap & NFP_NET_CFG_CTRL_SCATTER ? "SCATTER " : "",
nn->cap & NFP_NET_CFG_CTRL_GATHER ? "GATHER " : "",
nn->cap & NFP_NET_CFG_CTRL_LSO ? "TSO " : "",
nn->cap & NFP_NET_CFG_CTRL_RSS ? "RSS " : "",
nn->cap & NFP_NET_CFG_CTRL_L2SWITCH ? "L2SWITCH " : "",
nn->cap & NFP_NET_CFG_CTRL_MSIXAUTO ? "AUTOMASK " : "",
nn->cap & NFP_NET_CFG_CTRL_IRQMOD ? "IRQMOD " : "",
nn->cap & NFP_NET_CFG_CTRL_VXLAN ? "VXLAN " : "",
nn->cap & NFP_NET_CFG_CTRL_NVGRE ? "NVGRE " : "",
nfp_net_ebpf_capable(nn) ? "BPF " : "");
}
/**
* nfp_net_netdev_alloc() - Allocate netdev and related structure
* @pdev: PCI device
* @max_tx_rings: Maximum number of TX rings supported by device
* @max_rx_rings: Maximum number of RX rings supported by device
*
* This function allocates a netdev device and fills in the initial
* part of the @struct nfp_net structure.
*
* Return: NFP Net device structure, or ERR_PTR on error.
*/
struct nfp_net *nfp_net_netdev_alloc(struct pci_dev *pdev,
unsigned int max_tx_rings,
unsigned int max_rx_rings)
{
struct net_device *netdev;
struct nfp_net *nn;
netdev = alloc_etherdev_mqs(sizeof(struct nfp_net),
max_tx_rings, max_rx_rings);
if (!netdev)
return ERR_PTR(-ENOMEM);
SET_NETDEV_DEV(netdev, &pdev->dev);
nn = netdev_priv(netdev);
nn->dp.netdev = netdev;
nn->dp.dev = &pdev->dev;
nn->pdev = pdev;
nn->max_tx_rings = max_tx_rings;
nn->max_rx_rings = max_rx_rings;
nn->dp.num_tx_rings = min_t(unsigned int,
max_tx_rings, num_online_cpus());
nn->dp.num_rx_rings = min_t(unsigned int, max_rx_rings,
netif_get_num_default_rss_queues());
nn->dp.num_r_vecs = max(nn->dp.num_tx_rings, nn->dp.num_rx_rings);
nn->dp.num_r_vecs = min_t(unsigned int,
nn->dp.num_r_vecs, num_online_cpus());
nn->dp.txd_cnt = NFP_NET_TX_DESCS_DEFAULT;
nn->dp.rxd_cnt = NFP_NET_RX_DESCS_DEFAULT;
spin_lock_init(&nn->reconfig_lock);
spin_lock_init(&nn->rx_filter_lock);
spin_lock_init(&nn->link_status_lock);
setup_timer(&nn->reconfig_timer,
nfp_net_reconfig_timer, (unsigned long)nn);
setup_timer(&nn->rx_filter_stats_timer,
nfp_net_filter_stats_timer, (unsigned long)nn);
return nn;
}
/**
* nfp_net_netdev_free() - Undo what @nfp_net_netdev_alloc() did
* @nn: NFP Net device to reconfigure
*/
void nfp_net_netdev_free(struct nfp_net *nn)
{
free_netdev(nn->dp.netdev);
}
/**
* nfp_net_rss_key_sz() - Get current size of the RSS key
* @nn: NFP Net device instance
*
* Return: size of the RSS key for currently selected hash function.
*/
unsigned int nfp_net_rss_key_sz(struct nfp_net *nn)
{
switch (nn->rss_hfunc) {
case ETH_RSS_HASH_TOP:
return NFP_NET_CFG_RSS_KEY_SZ;
case ETH_RSS_HASH_XOR:
return 0;
case ETH_RSS_HASH_CRC32:
return 4;
}
nn_warn(nn, "Unknown hash function: %u\n", nn->rss_hfunc);
return 0;
}
/**
* nfp_net_rss_init() - Set the initial RSS parameters
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_rss_init(struct nfp_net *nn)
{
unsigned long func_bit, rss_cap_hfunc;
u32 reg;
/* Read the RSS function capability and select first supported func */
reg = nn_readl(nn, NFP_NET_CFG_RSS_CAP);
rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC, reg);
if (!rss_cap_hfunc)
rss_cap_hfunc = FIELD_GET(NFP_NET_CFG_RSS_CAP_HFUNC,
NFP_NET_CFG_RSS_TOEPLITZ);
func_bit = find_first_bit(&rss_cap_hfunc, NFP_NET_CFG_RSS_HFUNCS);
if (func_bit == NFP_NET_CFG_RSS_HFUNCS) {
dev_warn(nn->dp.dev,
"Bad RSS config, defaulting to Toeplitz hash\n");
func_bit = ETH_RSS_HASH_TOP_BIT;
}
nn->rss_hfunc = 1 << func_bit;
netdev_rss_key_fill(nn->rss_key, nfp_net_rss_key_sz(nn));
nfp_net_rss_init_itbl(nn);
/* Enable IPv4/IPv6 TCP by default */
nn->rss_cfg = NFP_NET_CFG_RSS_IPV4_TCP |
NFP_NET_CFG_RSS_IPV6_TCP |
FIELD_PREP(NFP_NET_CFG_RSS_HFUNC, nn->rss_hfunc) |
NFP_NET_CFG_RSS_MASK;
}
/**
* nfp_net_irqmod_init() - Set the initial IRQ moderation parameters
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_irqmod_init(struct nfp_net *nn)
{
nn->rx_coalesce_usecs = 50;
nn->rx_coalesce_max_frames = 64;
nn->tx_coalesce_usecs = 50;
nn->tx_coalesce_max_frames = 64;
}
/**
* nfp_net_netdev_init() - Initialise/finalise the netdev structure
* @netdev: netdev structure
*
* Return: 0 on success or negative errno on error.
*/
int nfp_net_netdev_init(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
int err;
/* XDP calls for 256 byte packet headroom which wouldn't fit in a u8.
* We, however, reuse the metadata prepend space for XDP buffers which
* is at least 1 byte long and as long as XDP headroom doesn't increase
* above 256 the *extra* XDP headroom will fit on 8 bits.
*/
BUILD_BUG_ON(XDP_PACKET_HEADROOM > 256);
nn->dp.chained_metadata_format = nn->fw_ver.major > 3;
nn->dp.rx_dma_dir = DMA_FROM_DEVICE;
/* Get some of the read-only fields from the BAR */
nn->cap = nn_readl(nn, NFP_NET_CFG_CAP);
nn->max_mtu = nn_readl(nn, NFP_NET_CFG_MAX_MTU);
nfp_net_write_mac_addr(nn);
/* Determine RX packet/metadata boundary offset */
if (nn->fw_ver.major >= 2) {
u32 reg;
reg = nn_readl(nn, NFP_NET_CFG_RX_OFFSET);
if (reg > NFP_NET_MAX_PREPEND) {
nn_err(nn, "Invalid rx offset: %d\n", reg);
return -EINVAL;
}
nn->dp.rx_offset = reg;
} else {
nn->dp.rx_offset = NFP_NET_RX_OFFSET;
}
/* Set default MTU and Freelist buffer size */
if (nn->max_mtu < NFP_NET_DEFAULT_MTU)
netdev->mtu = nn->max_mtu;
else
netdev->mtu = NFP_NET_DEFAULT_MTU;
nn->dp.mtu = netdev->mtu;
nn->dp.fl_bufsz = nfp_net_calc_fl_bufsz(&nn->dp);
/* Advertise/enable offloads based on capabilities
*
* Note: netdev->features show the currently enabled features
* and netdev->hw_features advertises which features are
* supported. By default we enable most features.
*/
netdev->hw_features = NETIF_F_HIGHDMA;
if (nn->cap & NFP_NET_CFG_CTRL_RXCSUM) {
netdev->hw_features |= NETIF_F_RXCSUM;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXCSUM;
}
if (nn->cap & NFP_NET_CFG_CTRL_TXCSUM) {
netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXCSUM;
}
if (nn->cap & NFP_NET_CFG_CTRL_GATHER) {
netdev->hw_features |= NETIF_F_SG;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_GATHER;
}
if ((nn->cap & NFP_NET_CFG_CTRL_LSO) && nn->fw_ver.major > 2) {
netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_LSO;
}
if (nn->cap & NFP_NET_CFG_CTRL_RSS) {
netdev->hw_features |= NETIF_F_RXHASH;
nfp_net_rss_init(nn);
nn->dp.ctrl |= NFP_NET_CFG_CTRL_RSS;
}
if (nn->cap & NFP_NET_CFG_CTRL_VXLAN &&
nn->cap & NFP_NET_CFG_CTRL_NVGRE) {
if (nn->cap & NFP_NET_CFG_CTRL_LSO)
netdev->hw_features |= NETIF_F_GSO_GRE |
NETIF_F_GSO_UDP_TUNNEL;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE;
netdev->hw_enc_features = netdev->hw_features;
}
netdev->vlan_features = netdev->hw_features;
if (nn->cap & NFP_NET_CFG_CTRL_RXVLAN) {
netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_RXVLAN;
}
if (nn->cap & NFP_NET_CFG_CTRL_TXVLAN) {
netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
nn->dp.ctrl |= NFP_NET_CFG_CTRL_TXVLAN;
}
netdev->features = netdev->hw_features;
if (nfp_net_ebpf_capable(nn))
netdev->hw_features |= NETIF_F_HW_TC;
/* Advertise but disable TSO by default. */
netdev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
/* Allow L2 Broadcast and Multicast through by default, if supported */
if (nn->cap & NFP_NET_CFG_CTRL_L2BC)
nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2BC;
if (nn->cap & NFP_NET_CFG_CTRL_L2MC)
nn->dp.ctrl |= NFP_NET_CFG_CTRL_L2MC;
/* Allow IRQ moderation, if supported */
if (nn->cap & NFP_NET_CFG_CTRL_IRQMOD) {
nfp_net_irqmod_init(nn);
nn->dp.ctrl |= NFP_NET_CFG_CTRL_IRQMOD;
}
/* Stash the re-configuration queue away. First odd queue in TX Bar */
nn->qcp_cfg = nn->tx_bar + NFP_QCP_QUEUE_ADDR_SZ;
/* Make sure the FW knows the netdev is supposed to be disabled here */
nn_writel(nn, NFP_NET_CFG_CTRL, 0);
nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
err = nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_RING |
NFP_NET_CFG_UPDATE_GEN);
if (err)
return err;
/* Finalise the netdev setup */
netdev->netdev_ops = &nfp_net_netdev_ops;
netdev->watchdog_timeo = msecs_to_jiffies(5 * 1000);
/* MTU range: 68 - hw-specific max */
netdev->min_mtu = ETH_MIN_MTU;
netdev->max_mtu = nn->max_mtu;
netif_carrier_off(netdev);
nfp_net_set_ethtool_ops(netdev);
nfp_net_vecs_init(netdev);
return register_netdev(netdev);
}
/**
* nfp_net_netdev_clean() - Undo what nfp_net_netdev_init() did.
* @netdev: netdev structure
*/
void nfp_net_netdev_clean(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
unregister_netdev(nn->dp.netdev);
if (nn->dp.xdp_prog)
bpf_prog_put(nn->dp.xdp_prog);
if (nn->dp.bpf_offload_xdp)
nfp_net_xdp_offload(nn, NULL);
}
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