blob: 850bfdf83d0a435f5e5b05664f43982382a6f93a [file] [log] [blame]
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2015-2018 Netronome Systems, Inc. */
/*
* nfp_net_common.c
* Netronome network device driver: Common functions between PF and VF
* Authors: Jakub Kicinski <jakub.kicinski@netronome.com>
* Jason McMullan <jason.mcmullan@netronome.com>
* Rolf Neugebauer <rolf.neugebauer@netronome.com>
* Brad Petrus <brad.petrus@netronome.com>
* Chris Telfer <chris.telfer@netronome.com>
*/
#include <linux/bitfield.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/mm.h>
#include <linux/overflow.h>
#include <linux/page_ref.h>
#include <linux/pci.h>
#include <linux/pci_regs.h>
#include <linux/msi.h>
#include <linux/ethtool.h>
#include <linux/log2.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
#include <linux/vmalloc.h>
#include <linux/ktime.h>
#include <net/tls.h>
#include <net/vxlan.h>
#include "nfpcore/nfp_nsp.h"
#include "ccm.h"
#include "nfp_app.h"
#include "nfp_net_ctrl.h"
#include "nfp_net.h"
#include "nfp_net_sriov.h"
#include "nfp_port.h"
#include "crypto/crypto.h"
#include "crypto/fw.h"
/**
* nfp_net_get_fw_version() - Read and parse the FW version
* @fw_ver: Output fw_version structure to read to
* @ctrl_bar: Mapped address of the control BAR
*/
void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
void __iomem *ctrl_bar)
{
u32 reg;
reg = readl(ctrl_bar + NFP_NET_CFG_VERSION);
put_unaligned_le32(reg, fw_ver);
}
static dma_addr_t nfp_net_dma_map_rx(struct nfp_net_dp *dp, void *frag)
{
return dma_map_single_attrs(dp->dev, frag + NFP_NET_RX_BUF_HEADROOM,
dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
}
static void
nfp_net_dma_sync_dev_rx(const struct nfp_net_dp *dp, dma_addr_t dma_addr)
{
dma_sync_single_for_device(dp->dev, dma_addr,
dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
dp->rx_dma_dir);
}
static void nfp_net_dma_unmap_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr)
{
dma_unmap_single_attrs(dp->dev, dma_addr,
dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA,
dp->rx_dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
}
static void nfp_net_dma_sync_cpu_rx(struct nfp_net_dp *dp, dma_addr_t dma_addr,
unsigned int len)
{
dma_sync_single_for_cpu(dp->dev, dma_addr - NFP_NET_RX_BUF_HEADROOM,
len, dp->rx_dma_dir);
}
/* Firmware reconfig
*
* Firmware reconfig may take a while so we have two versions of it -
* synchronous and asynchronous (posted). All synchronous callers are holding
* RTNL so we don't have to worry about serializing them.
*/
static void nfp_net_reconfig_start(struct nfp_net *nn, u32 update)
{
nn_writel(nn, NFP_NET_CFG_UPDATE, update);
/* ensure update is written before pinging HW */
nn_pci_flush(nn);
nfp_qcp_wr_ptr_add(nn->qcp_cfg, 1);
nn->reconfig_in_progress_update = update;
}
/* 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 (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n",
reg, nn->reconfig_in_progress_update,
nn_readl(nn, NFP_NET_CFG_CTRL));
return true;
} else if (last_check) {
nn_err(nn, "Reconfig timeout (status: 0x%08x update: 0x%08x ctrl: 0x%08x)\n",
reg, nn->reconfig_in_progress_update,
nn_readl(nn, NFP_NET_CFG_CTRL));
return true;
}
return false;
}
static bool __nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
bool timed_out = false;
int i;
/* Poll update field, waiting for NFP to ack the config.
* Do an opportunistic wait-busy loop, afterward sleep.
*/
for (i = 0; i < 50; i++) {
if (nfp_net_reconfig_check_done(nn, false))
return false;
udelay(4);
}
while (!nfp_net_reconfig_check_done(nn, timed_out)) {
usleep_range(250, 500);
timed_out = time_is_before_eq_jiffies(deadline);
}
return timed_out;
}
static int nfp_net_reconfig_wait(struct nfp_net *nn, unsigned long deadline)
{
if (__nfp_net_reconfig_wait(nn, deadline))
return -EIO;
if (nn_readl(nn, NFP_NET_CFG_UPDATE) & NFP_NET_CFG_UPDATE_ERR)
return -EIO;
return 0;
}
static void nfp_net_reconfig_timer(struct timer_list *t)
{
struct nfp_net *nn = from_timer(nn, t, reconfig_timer);
spin_lock_bh(&nn->reconfig_lock);
nn->reconfig_timer_active = false;
/* If sync caller is present it will take over from us */
if (nn->reconfig_sync_present)
goto done;
/* Read reconfig status and report errors */
nfp_net_reconfig_check_done(nn, true);
if (nn->reconfig_posted)
nfp_net_reconfig_start_async(nn, 0);
done:
spin_unlock_bh(&nn->reconfig_lock);
}
/**
* nfp_net_reconfig_post() - Post async reconfig request
* @nn: NFP Net device to reconfigure
* @update: The value for the update field in the BAR config
*
* Record FW reconfiguration request. Reconfiguration will be kicked off
* whenever reconfiguration machinery is idle. Multiple requests can be
* merged together!
*/
static void nfp_net_reconfig_post(struct nfp_net *nn, u32 update)
{
spin_lock_bh(&nn->reconfig_lock);
/* Sync caller will kick off async reconf when it's done, just post */
if (nn->reconfig_sync_present) {
nn->reconfig_posted |= update;
goto done;
}
/* Opportunistically check if the previous command is done */
if (!nn->reconfig_timer_active ||
nfp_net_reconfig_check_done(nn, false))
nfp_net_reconfig_start_async(nn, update);
else
nn->reconfig_posted |= update;
done:
spin_unlock_bh(&nn->reconfig_lock);
}
static void nfp_net_reconfig_sync_enter(struct nfp_net *nn)
{
bool cancelled_timer = false;
u32 pre_posted_requests;
spin_lock_bh(&nn->reconfig_lock);
WARN_ON(nn->reconfig_sync_present);
nn->reconfig_sync_present = true;
if (nn->reconfig_timer_active) {
nn->reconfig_timer_active = false;
cancelled_timer = true;
}
pre_posted_requests = nn->reconfig_posted;
nn->reconfig_posted = 0;
spin_unlock_bh(&nn->reconfig_lock);
if (cancelled_timer) {
del_timer_sync(&nn->reconfig_timer);
nfp_net_reconfig_wait(nn, nn->reconfig_timer.expires);
}
/* Run the posted reconfigs which were issued before we started */
if (pre_posted_requests) {
nfp_net_reconfig_start(nn, pre_posted_requests);
nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
}
}
static void nfp_net_reconfig_wait_posted(struct nfp_net *nn)
{
nfp_net_reconfig_sync_enter(nn);
spin_lock_bh(&nn->reconfig_lock);
nn->reconfig_sync_present = false;
spin_unlock_bh(&nn->reconfig_lock);
}
/**
* __nfp_net_reconfig() - Reconfigure the firmware
* @nn: NFP Net device to reconfigure
* @update: The value for the update field in the BAR config
*
* Write the update word to the BAR and ping the reconfig queue. The
* poll until the firmware has acknowledged the update by zeroing the
* update word.
*
* Return: Negative errno on error, 0 on success
*/
int __nfp_net_reconfig(struct nfp_net *nn, u32 update)
{
int ret;
nfp_net_reconfig_sync_enter(nn);
nfp_net_reconfig_start(nn, update);
ret = nfp_net_reconfig_wait(nn, jiffies + HZ * NFP_NET_POLL_TIMEOUT);
spin_lock_bh(&nn->reconfig_lock);
if (nn->reconfig_posted)
nfp_net_reconfig_start_async(nn, 0);
nn->reconfig_sync_present = false;
spin_unlock_bh(&nn->reconfig_lock);
return ret;
}
int nfp_net_reconfig(struct nfp_net *nn, u32 update)
{
int ret;
nn_ctrl_bar_lock(nn);
ret = __nfp_net_reconfig(nn, update);
nn_ctrl_bar_unlock(nn);
return ret;
}
int nfp_net_mbox_lock(struct nfp_net *nn, unsigned int data_size)
{
if (nn->tlv_caps.mbox_len < NFP_NET_CFG_MBOX_SIMPLE_VAL + data_size) {
nn_err(nn, "mailbox too small for %u of data (%u)\n",
data_size, nn->tlv_caps.mbox_len);
return -EIO;
}
nn_ctrl_bar_lock(nn);
return 0;
}
/**
* nfp_net_mbox_reconfig() - Reconfigure the firmware via the mailbox
* @nn: NFP Net device to reconfigure
* @mbox_cmd: The value for the mailbox command
*
* Helper function for mailbox updates
*
* Return: Negative errno on error, 0 on success
*/
int nfp_net_mbox_reconfig(struct nfp_net *nn, u32 mbox_cmd)
{
u32 mbox = nn->tlv_caps.mbox_off;
int ret;
nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd);
ret = __nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_MBOX);
if (ret) {
nn_err(nn, "Mailbox update error\n");
return ret;
}
return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET);
}
void nfp_net_mbox_reconfig_post(struct nfp_net *nn, u32 mbox_cmd)
{
u32 mbox = nn->tlv_caps.mbox_off;
nn_writeq(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_CMD, mbox_cmd);
nfp_net_reconfig_post(nn, NFP_NET_CFG_UPDATE_MBOX);
}
int nfp_net_mbox_reconfig_wait_posted(struct nfp_net *nn)
{
u32 mbox = nn->tlv_caps.mbox_off;
nfp_net_reconfig_wait_posted(nn);
return -nn_readl(nn, mbox + NFP_NET_CFG_MBOX_SIMPLE_RET);
}
int nfp_net_mbox_reconfig_and_unlock(struct nfp_net *nn, u32 mbox_cmd)
{
int ret;
ret = nfp_net_mbox_reconfig(nn, mbox_cmd);
nn_ctrl_bar_unlock(nn);
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;
/* Currently we cannot tell if it's a rx or tx interrupt,
* since dim does not need accurate event_ctr to calculate,
* we just use this counter for both rx and tx dim.
*/
r_vec->event_ctr++;
napi_schedule_irqoff(&r_vec->napi);
/* The FW auto-masks any interrupt, either via the MASK bit in
* the MSI-X table or via the per entry ICR field. So there
* is no need to disable interrupts here.
*/
return IRQ_HANDLED;
}
static irqreturn_t nfp_ctrl_irq_rxtx(int irq, void *data)
{
struct nfp_net_r_vector *r_vec = data;
tasklet_schedule(&r_vec->tasklet);
return IRQ_HANDLED;
}
/**
* nfp_net_read_link_status() - Reread link status from control BAR
* @nn: NFP Network structure
*/
static void nfp_net_read_link_status(struct nfp_net *nn)
{
unsigned long flags;
bool link_up;
u32 sts;
spin_lock_irqsave(&nn->link_status_lock, flags);
sts = nn_readl(nn, NFP_NET_CFG_STS);
link_up = !!(sts & NFP_NET_CFG_STS_LINK);
if (nn->link_up == link_up)
goto out;
nn->link_up = link_up;
if (nn->port)
set_bit(NFP_PORT_CHANGED, &nn->port->flags);
if (nn->link_up) {
netif_carrier_on(nn->dp.netdev);
netdev_info(nn->dp.netdev, "NIC Link is Up\n");
} else {
netif_carrier_off(nn->dp.netdev);
netdev_info(nn->dp.netdev, "NIC Link is Down\n");
}
out:
spin_unlock_irqrestore(&nn->link_status_lock, flags);
}
/**
* nfp_net_irq_lsc() - Interrupt service routine for link state changes
* @irq: Interrupt
* @data: Opaque data structure
*
* Return: Indicate if the interrupt has been handled.
*/
static irqreturn_t nfp_net_irq_lsc(int irq, void *data)
{
struct nfp_net *nn = data;
struct msix_entry *entry;
entry = &nn->irq_entries[NFP_NET_IRQ_LSC_IDX];
nfp_net_read_link_status(nn);
nfp_net_irq_unmask(nn, entry->entry);
return IRQ_HANDLED;
}
/**
* nfp_net_irq_exn() - Interrupt service routine for exceptions
* @irq: Interrupt
* @data: Opaque data structure
*
* Return: Indicate if the interrupt has been handled.
*/
static irqreturn_t nfp_net_irq_exn(int irq, void *data)
{
struct nfp_net *nn = data;
nn_err(nn, "%s: UNIMPLEMENTED.\n", __func__);
/* XXX TO BE IMPLEMENTED */
return IRQ_HANDLED;
}
/**
* nfp_net_tx_ring_init() - Fill in the boilerplate for a TX ring
* @tx_ring: TX ring structure
* @r_vec: IRQ vector servicing this ring
* @idx: Ring index
* @is_xdp: Is this an XDP TX ring?
*/
static void
nfp_net_tx_ring_init(struct nfp_net_tx_ring *tx_ring,
struct nfp_net_r_vector *r_vec, unsigned int idx,
bool is_xdp)
{
struct nfp_net *nn = r_vec->nfp_net;
tx_ring->idx = idx;
tx_ring->r_vec = r_vec;
tx_ring->is_xdp = is_xdp;
u64_stats_init(&tx_ring->r_vec->tx_sync);
tx_ring->qcidx = tx_ring->idx * nn->stride_tx;
tx_ring->qcp_q = nn->tx_bar + NFP_QCP_QUEUE_OFF(tx_ring->qcidx);
}
/**
* nfp_net_rx_ring_init() - Fill in the boilerplate for a RX ring
* @rx_ring: RX ring structure
* @r_vec: IRQ vector servicing this ring
* @idx: Ring index
*/
static void
nfp_net_rx_ring_init(struct nfp_net_rx_ring *rx_ring,
struct nfp_net_r_vector *r_vec, unsigned int idx)
{
struct nfp_net *nn = r_vec->nfp_net;
rx_ring->idx = idx;
rx_ring->r_vec = r_vec;
u64_stats_init(&rx_ring->r_vec->rx_sync);
rx_ring->fl_qcidx = rx_ring->idx * nn->stride_rx;
rx_ring->qcp_fl = nn->rx_bar + NFP_QCP_QUEUE_OFF(rx_ring->fl_qcidx);
}
/**
* nfp_net_aux_irq_request() - Request an auxiliary interrupt (LSC or EXN)
* @nn: NFP Network structure
* @ctrl_offset: Control BAR offset where IRQ configuration should be written
* @format: printf-style format to construct the interrupt name
* @name: Pointer to allocated space for interrupt name
* @name_sz: Size of space for interrupt name
* @vector_idx: Index of MSI-X vector used for this interrupt
* @handler: IRQ handler to register for this interrupt
*/
static int
nfp_net_aux_irq_request(struct nfp_net *nn, u32 ctrl_offset,
const char *format, char *name, size_t name_sz,
unsigned int vector_idx, irq_handler_t handler)
{
struct msix_entry *entry;
int err;
entry = &nn->irq_entries[vector_idx];
snprintf(name, name_sz, format, nfp_net_name(nn));
err = request_irq(entry->vector, handler, 0, name, nn);
if (err) {
nn_err(nn, "Failed to request IRQ %d (err=%d).\n",
entry->vector, err);
return err;
}
nn_writeb(nn, ctrl_offset, entry->entry);
nfp_net_irq_unmask(nn, entry->entry);
return 0;
}
/**
* nfp_net_aux_irq_free() - Free an auxiliary interrupt (LSC or EXN)
* @nn: NFP Network structure
* @ctrl_offset: Control BAR offset where IRQ configuration should be written
* @vector_idx: Index of MSI-X vector used for this interrupt
*/
static void nfp_net_aux_irq_free(struct nfp_net *nn, u32 ctrl_offset,
unsigned int vector_idx)
{
nn_writeb(nn, ctrl_offset, 0xff);
nn_pci_flush(nn);
free_irq(nn->irq_entries[vector_idx].vector, nn);
}
/* Transmit
*
* One queue controller peripheral queue is used for transmit. The
* driver en-queues packets for transmit by advancing the write
* pointer. The device indicates that packets have transmitted by
* advancing the read pointer. The driver maintains a local copy of
* the read and write pointer in @struct nfp_net_tx_ring. The driver
* keeps @wr_p in sync with the queue controller write pointer and can
* determine how many packets have been transmitted by comparing its
* copy of the read pointer @rd_p with the read pointer maintained by
* the queue controller peripheral.
*/
/**
* nfp_net_tx_full() - Check if the TX ring is full
* @tx_ring: TX ring to check
* @dcnt: Number of descriptors that need to be enqueued (must be >= 1)
*
* This function checks, based on the *host copy* of read/write
* pointer if a given TX ring is full. The real TX queue may have
* some newly made available slots.
*
* Return: True if the ring is full.
*/
static int nfp_net_tx_full(struct nfp_net_tx_ring *tx_ring, int dcnt)
{
return (tx_ring->wr_p - tx_ring->rd_p) >= (tx_ring->cnt - dcnt);
}
/* Wrappers for deciding when to stop and restart TX queues */
static int nfp_net_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
{
return !nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS * 4);
}
static int nfp_net_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
{
return nfp_net_tx_full(tx_ring, MAX_SKB_FRAGS + 1);
}
/**
* nfp_net_tx_ring_stop() - stop tx ring
* @nd_q: netdev queue
* @tx_ring: driver tx queue structure
*
* Safely stop TX ring. Remember that while we are running .start_xmit()
* someone else may be cleaning the TX ring completions so we need to be
* extra careful here.
*/
static void nfp_net_tx_ring_stop(struct netdev_queue *nd_q,
struct nfp_net_tx_ring *tx_ring)
{
netif_tx_stop_queue(nd_q);
/* We can race with the TX completion out of NAPI so recheck */
smp_mb();
if (unlikely(nfp_net_tx_ring_should_wake(tx_ring)))
netif_tx_start_queue(nd_q);
}
/**
* nfp_net_tx_tso() - Set up Tx descriptor for LSO
* @r_vec: per-ring structure
* @txbuf: Pointer to driver soft TX descriptor
* @txd: Pointer to HW TX descriptor
* @skb: Pointer to SKB
* @md_bytes: Prepend length
*
* 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 md_bytes)
{
u32 l3_offset, l4_offset, hdrlen;
u16 mss;
if (!skb_is_gso(skb))
return;
if (!skb->encapsulation) {
l3_offset = skb_network_offset(skb);
l4_offset = skb_transport_offset(skb);
hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
} else {
l3_offset = skb_inner_network_offset(skb);
l4_offset = skb_inner_transport_offset(skb);
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
}
txbuf->pkt_cnt = skb_shinfo(skb)->gso_segs;
txbuf->real_len += hdrlen * (txbuf->pkt_cnt - 1);
mss = skb_shinfo(skb)->gso_size & PCIE_DESC_TX_MSS_MASK;
txd->l3_offset = l3_offset - md_bytes;
txd->l4_offset = l4_offset - md_bytes;
txd->lso_hdrlen = hdrlen - md_bytes;
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 struct sk_buff *
nfp_net_tls_tx(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
struct sk_buff *skb, u64 *tls_handle, int *nr_frags)
{
#ifdef CONFIG_TLS_DEVICE
struct nfp_net_tls_offload_ctx *ntls;
struct sk_buff *nskb;
bool resync_pending;
u32 datalen, seq;
if (likely(!dp->ktls_tx))
return skb;
if (!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk))
return skb;
datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb));
seq = ntohl(tcp_hdr(skb)->seq);
ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX);
resync_pending = tls_offload_tx_resync_pending(skb->sk);
if (unlikely(resync_pending || ntls->next_seq != seq)) {
/* Pure ACK out of order already */
if (!datalen)
return skb;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tls_tx_fallback++;
u64_stats_update_end(&r_vec->tx_sync);
nskb = tls_encrypt_skb(skb);
if (!nskb) {
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tls_tx_no_fallback++;
u64_stats_update_end(&r_vec->tx_sync);
return NULL;
}
/* encryption wasn't necessary */
if (nskb == skb)
return skb;
/* we don't re-check ring space */
if (unlikely(skb_is_nonlinear(nskb))) {
nn_dp_warn(dp, "tls_encrypt_skb() produced fragmented frame\n");
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_errors++;
u64_stats_update_end(&r_vec->tx_sync);
dev_kfree_skb_any(nskb);
return NULL;
}
/* jump forward, a TX may have gotten lost, need to sync TX */
if (!resync_pending && seq - ntls->next_seq < U32_MAX / 4)
tls_offload_tx_resync_request(nskb->sk, seq,
ntls->next_seq);
*nr_frags = 0;
return nskb;
}
if (datalen) {
u64_stats_update_begin(&r_vec->tx_sync);
if (!skb_is_gso(skb))
r_vec->hw_tls_tx++;
else
r_vec->hw_tls_tx += skb_shinfo(skb)->gso_segs;
u64_stats_update_end(&r_vec->tx_sync);
}
memcpy(tls_handle, ntls->fw_handle, sizeof(ntls->fw_handle));
ntls->next_seq += datalen;
#endif
return skb;
}
static void nfp_net_tls_tx_undo(struct sk_buff *skb, u64 tls_handle)
{
#ifdef CONFIG_TLS_DEVICE
struct nfp_net_tls_offload_ctx *ntls;
u32 datalen, seq;
if (!tls_handle)
return;
if (WARN_ON_ONCE(!skb->sk || !tls_is_sk_tx_device_offloaded(skb->sk)))
return;
datalen = skb->len - (skb_transport_offset(skb) + tcp_hdrlen(skb));
seq = ntohl(tcp_hdr(skb)->seq);
ntls = tls_driver_ctx(skb->sk, TLS_OFFLOAD_CTX_DIR_TX);
if (ntls->next_seq == seq + datalen)
ntls->next_seq = seq;
else
WARN_ON_ONCE(1);
#endif
}
static void nfp_net_tx_xmit_more_flush(struct nfp_net_tx_ring *tx_ring)
{
wmb();
nfp_qcp_wr_ptr_add(tx_ring->qcp_q, tx_ring->wr_ptr_add);
tx_ring->wr_ptr_add = 0;
}
static int nfp_net_prep_tx_meta(struct sk_buff *skb, u64 tls_handle)
{
struct metadata_dst *md_dst = skb_metadata_dst(skb);
unsigned char *data;
u32 meta_id = 0;
int md_bytes;
if (likely(!md_dst && !tls_handle))
return 0;
if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX)) {
if (!tls_handle)
return 0;
md_dst = NULL;
}
md_bytes = 4 + !!md_dst * 4 + !!tls_handle * 8;
if (unlikely(skb_cow_head(skb, md_bytes)))
return -ENOMEM;
meta_id = 0;
data = skb_push(skb, md_bytes) + md_bytes;
if (md_dst) {
data -= 4;
put_unaligned_be32(md_dst->u.port_info.port_id, data);
meta_id = NFP_NET_META_PORTID;
}
if (tls_handle) {
/* conn handle is opaque, we just use u64 to be able to quickly
* compare it to zero
*/
data -= 8;
memcpy(data, &tls_handle, sizeof(tls_handle));
meta_id <<= NFP_NET_META_FIELD_SIZE;
meta_id |= NFP_NET_META_CONN_HANDLE;
}
data -= 4;
put_unaligned_be32(meta_id, data);
return md_bytes;
}
/**
* nfp_net_tx() - Main transmit entry point
* @skb: SKB to transmit
* @netdev: netdev structure
*
* Return: NETDEV_TX_OK on success.
*/
static netdev_tx_t nfp_net_tx(struct sk_buff *skb, struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
const skb_frag_t *frag;
int f, nr_frags, wr_idx, md_bytes;
struct nfp_net_tx_ring *tx_ring;
struct nfp_net_r_vector *r_vec;
struct nfp_net_tx_buf *txbuf;
struct nfp_net_tx_desc *txd;
struct netdev_queue *nd_q;
struct nfp_net_dp *dp;
dma_addr_t dma_addr;
unsigned int fsize;
u64 tls_handle = 0;
u16 qidx;
dp = &nn->dp;
qidx = skb_get_queue_mapping(skb);
tx_ring = &dp->tx_rings[qidx];
r_vec = tx_ring->r_vec;
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);
nd_q = netdev_get_tx_queue(dp->netdev, qidx);
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;
}
skb = nfp_net_tls_tx(dp, r_vec, skb, &tls_handle, &nr_frags);
if (unlikely(!skb)) {
nfp_net_tx_xmit_more_flush(tx_ring);
return NETDEV_TX_OK;
}
md_bytes = nfp_net_prep_tx_meta(skb, tls_handle);
if (unlikely(md_bytes < 0))
goto err_flush;
/* Start with the head skbuf */
dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_dma_err;
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->skb = skb;
txbuf->dma_addr = dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = skb->len;
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = (nr_frags ? 0 : PCIE_DESC_TX_EOP) | md_bytes;
txd->dma_len = cpu_to_le16(skb_headlen(skb));
nfp_desc_set_dma_addr(txd, dma_addr);
txd->data_len = cpu_to_le16(skb->len);
txd->flags = 0;
txd->mss = 0;
txd->lso_hdrlen = 0;
/* Do not reorder - tso may adjust pkt cnt, vlan may override fields */
nfp_net_tx_tso(r_vec, txbuf, txd, skb, md_bytes);
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) {
__le64 second_half;
/* all descs must match except for in addr, length and eop */
second_half = txd->vals8[1];
for (f = 0; f < nr_frags; f++) {
frag = &skb_shinfo(skb)->frags[f];
fsize = skb_frag_size(frag);
dma_addr = skb_frag_dma_map(dp->dev, frag, 0,
fsize, DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_unmap;
wr_idx = D_IDX(tx_ring, wr_idx + 1);
tx_ring->txbufs[wr_idx].skb = skb;
tx_ring->txbufs[wr_idx].dma_addr = dma_addr;
tx_ring->txbufs[wr_idx].fidx = f;
txd = &tx_ring->txds[wr_idx];
txd->dma_len = cpu_to_le16(fsize);
nfp_desc_set_dma_addr(txd, dma_addr);
txd->offset_eop = md_bytes |
((f == nr_frags - 1) ? PCIE_DESC_TX_EOP : 0);
txd->vals8[1] = second_half;
}
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_gather++;
u64_stats_update_end(&r_vec->tx_sync);
}
skb_tx_timestamp(skb);
nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
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 (__netdev_tx_sent_queue(nd_q, txbuf->real_len, netdev_xmit_more()))
nfp_net_tx_xmit_more_flush(tx_ring);
return NETDEV_TX_OK;
err_unmap:
while (--f >= 0) {
frag = &skb_shinfo(skb)->frags[f];
dma_unmap_page(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
tx_ring->txbufs[wr_idx].skb = NULL;
tx_ring->txbufs[wr_idx].dma_addr = 0;
tx_ring->txbufs[wr_idx].fidx = -2;
wr_idx = wr_idx - 1;
if (wr_idx < 0)
wr_idx += tx_ring->cnt;
}
dma_unmap_single(dp->dev, tx_ring->txbufs[wr_idx].dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
tx_ring->txbufs[wr_idx].skb = NULL;
tx_ring->txbufs[wr_idx].dma_addr = 0;
tx_ring->txbufs[wr_idx].fidx = -2;
err_dma_err:
nn_dp_warn(dp, "Failed to map DMA TX buffer\n");
err_flush:
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);
nfp_net_tls_tx_undo(skb, tls_handle);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/**
* nfp_net_tx_complete() - Handled completed TX packets
* @tx_ring: TX ring structure
* @budget: NAPI budget (only used as bool to determine if in NAPI context)
*/
static void nfp_net_tx_complete(struct nfp_net_tx_ring *tx_ring, int budget)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
struct netdev_queue *nd_q;
u32 done_pkts = 0, done_bytes = 0;
u32 qcp_rd_p;
int todo;
if (tx_ring->wr_p == tx_ring->rd_p)
return;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return;
todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
while (todo--) {
const skb_frag_t *frag;
struct nfp_net_tx_buf *tx_buf;
struct sk_buff *skb;
int fidx, nr_frags;
int idx;
idx = D_IDX(tx_ring, tx_ring->rd_p++);
tx_buf = &tx_ring->txbufs[idx];
skb = tx_buf->skb;
if (!skb)
continue;
nr_frags = skb_shinfo(skb)->nr_frags;
fidx = tx_buf->fidx;
if (fidx == -1) {
/* unmap head */
dma_unmap_single(dp->dev, tx_buf->dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
done_pkts += tx_buf->pkt_cnt;
done_bytes += tx_buf->real_len;
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[fidx];
dma_unmap_page(dp->dev, tx_buf->dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
}
/* check for last gather fragment */
if (fidx == nr_frags - 1)
napi_consume_skb(skb, budget);
tx_buf->dma_addr = 0;
tx_buf->skb = NULL;
tx_buf->fidx = -2;
}
tx_ring->qcp_rd_p = qcp_rd_p;
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_bytes += done_bytes;
r_vec->tx_pkts += done_pkts;
u64_stats_update_end(&r_vec->tx_sync);
if (!dp->netdev)
return;
nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
netdev_tx_completed_queue(nd_q, done_pkts, done_bytes);
if (nfp_net_tx_ring_should_wake(tx_ring)) {
/* Make sure TX thread will see updated tx_ring->rd_p */
smp_mb();
if (unlikely(netif_tx_queue_stopped(nd_q)))
netif_tx_wake_queue(nd_q);
}
WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
"TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
}
static bool nfp_net_xdp_complete(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
u32 done_pkts = 0, done_bytes = 0;
bool done_all;
int idx, todo;
u32 qcp_rd_p;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_qcp_rd_ptr_read(tx_ring->qcp_q);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return true;
todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
done_all = todo <= NFP_NET_XDP_MAX_COMPLETE;
todo = min(todo, NFP_NET_XDP_MAX_COMPLETE);
tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + todo);
done_pkts = todo;
while (todo--) {
idx = D_IDX(tx_ring, tx_ring->rd_p);
tx_ring->rd_p++;
done_bytes += tx_ring->txbufs[idx].real_len;
}
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_bytes += done_bytes;
r_vec->tx_pkts += done_pkts;
u64_stats_update_end(&r_vec->tx_sync);
WARN_ONCE(tx_ring->wr_p - tx_ring->rd_p > tx_ring->cnt,
"XDP TX ring corruption rd_p=%u wr_p=%u cnt=%u\n",
tx_ring->rd_p, tx_ring->wr_p, tx_ring->cnt);
return done_all;
}
/**
* nfp_net_tx_ring_reset() - Free any untransmitted buffers and reset pointers
* @dp: NFP Net data path struct
* @tx_ring: TX ring structure
*
* Assumes that the device is stopped, must be idempotent.
*/
static void
nfp_net_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
{
const skb_frag_t *frag;
struct netdev_queue *nd_q;
while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) {
struct nfp_net_tx_buf *tx_buf;
struct sk_buff *skb;
int idx, nr_frags;
idx = D_IDX(tx_ring, tx_ring->rd_p);
tx_buf = &tx_ring->txbufs[idx];
skb = tx_ring->txbufs[idx].skb;
nr_frags = skb_shinfo(skb)->nr_frags;
if (tx_buf->fidx == -1) {
/* unmap head */
dma_unmap_single(dp->dev, tx_buf->dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
} else {
/* unmap fragment */
frag = &skb_shinfo(skb)->frags[tx_buf->fidx];
dma_unmap_page(dp->dev, tx_buf->dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
}
/* check for last gather fragment */
if (tx_buf->fidx == nr_frags - 1)
dev_kfree_skb_any(skb);
tx_buf->dma_addr = 0;
tx_buf->skb = NULL;
tx_buf->fidx = -2;
tx_ring->qcp_rd_p++;
tx_ring->rd_p++;
}
memset(tx_ring->txds, 0, tx_ring->size);
tx_ring->wr_p = 0;
tx_ring->rd_p = 0;
tx_ring->qcp_rd_p = 0;
tx_ring->wr_ptr_add = 0;
if (tx_ring->is_xdp || !dp->netdev)
return;
nd_q = netdev_get_tx_queue(dp->netdev, tx_ring->idx);
netdev_tx_reset_queue(nd_q);
}
static void nfp_net_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
struct nfp_net *nn = netdev_priv(netdev);
nn_warn(nn, "TX watchdog timeout on ring: %u\n", txqueue);
}
/* Receive processing
*/
static unsigned int
nfp_net_calc_fl_bufsz(struct nfp_net_dp *dp)
{
unsigned int fl_bufsz;
fl_bufsz = NFP_NET_RX_BUF_HEADROOM;
fl_bufsz += dp->rx_dma_off;
if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
fl_bufsz += NFP_NET_MAX_PREPEND;
else
fl_bufsz += dp->rx_offset;
fl_bufsz += ETH_HLEN + VLAN_HLEN * 2 + dp->mtu;
fl_bufsz = SKB_DATA_ALIGN(fl_bufsz);
fl_bufsz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
return fl_bufsz;
}
static void
nfp_net_free_frag(void *frag, bool xdp)
{
if (!xdp)
skb_free_frag(frag);
else
__free_page(virt_to_page(frag));
}
/**
* nfp_net_rx_alloc_one() - Allocate and map page frag for RX
* @dp: NFP Net data path struct
* @dma_addr: Pointer to storage for DMA address (output param)
*
* This function will allcate a new page frag, map it for DMA.
*
* Return: allocated page frag or NULL on failure.
*/
static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog) {
frag = netdev_alloc_frag(dp->fl_bufsz);
} else {
struct page *page;
page = alloc_page(GFP_KERNEL);
frag = page ? page_address(page) : NULL;
}
if (!frag) {
nn_dp_warn(dp, "Failed to alloc receive page frag\n");
return NULL;
}
*dma_addr = nfp_net_dma_map_rx(dp, frag);
if (dma_mapping_error(dp->dev, *dma_addr)) {
nfp_net_free_frag(frag, dp->xdp_prog);
nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
return NULL;
}
return frag;
}
static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
{
void *frag;
if (!dp->xdp_prog) {
frag = napi_alloc_frag(dp->fl_bufsz);
if (unlikely(!frag))
return NULL;
} else {
struct page *page;
page = dev_alloc_page();
if (unlikely(!page))
return NULL;
frag = page_address(page);
}
*dma_addr = nfp_net_dma_map_rx(dp, frag);
if (dma_mapping_error(dp->dev, *dma_addr)) {
nfp_net_free_frag(frag, dp->xdp_prog);
nn_dp_warn(dp, "Failed to map DMA RX buffer\n");
return NULL;
}
return frag;
}
/**
* nfp_net_rx_give_one() - Put mapped skb on the software and hardware rings
* @dp: NFP Net data path struct
* @rx_ring: RX ring structure
* @frag: page fragment buffer
* @dma_addr: DMA address of skb mapping
*/
static void nfp_net_rx_give_one(const struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring,
void *frag, dma_addr_t dma_addr)
{
unsigned int wr_idx;
wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
nfp_net_dma_sync_dev_rx(dp, dma_addr);
/* Stash SKB and DMA address away */
rx_ring->rxbufs[wr_idx].frag = frag;
rx_ring->rxbufs[wr_idx].dma_addr = dma_addr;
/* Fill freelist descriptor */
rx_ring->rxds[wr_idx].fld.reserved = 0;
rx_ring->rxds[wr_idx].fld.meta_len_dd = 0;
nfp_desc_set_dma_addr(&rx_ring->rxds[wr_idx].fld,
dma_addr + dp->rx_dma_off);
rx_ring->wr_p++;
if (!(rx_ring->wr_p % NFP_NET_FL_BATCH)) {
/* Update write pointer of the freelist queue. Make
* sure all writes are flushed before telling the hardware.
*/
wmb();
nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, NFP_NET_FL_BATCH);
}
}
/**
* nfp_net_rx_ring_reset() - Reflect in SW state of freelist after disable
* @rx_ring: RX ring structure
*
* Assumes that the device is stopped, must be idempotent.
*/
static void nfp_net_rx_ring_reset(struct nfp_net_rx_ring *rx_ring)
{
unsigned int wr_idx, last_idx;
/* wr_p == rd_p means ring was never fed FL bufs. RX rings are always
* kept at cnt - 1 FL bufs.
*/
if (rx_ring->wr_p == 0 && rx_ring->rd_p == 0)
return;
/* Move the empty entry to the end of the list */
wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
last_idx = rx_ring->cnt - 1;
rx_ring->rxbufs[wr_idx].dma_addr = rx_ring->rxbufs[last_idx].dma_addr;
rx_ring->rxbufs[wr_idx].frag = rx_ring->rxbufs[last_idx].frag;
rx_ring->rxbufs[last_idx].dma_addr = 0;
rx_ring->rxbufs[last_idx].frag = NULL;
memset(rx_ring->rxds, 0, rx_ring->size);
rx_ring->wr_p = 0;
rx_ring->rd_p = 0;
}
/**
* nfp_net_rx_ring_bufs_free() - Free any buffers currently on the RX ring
* @dp: NFP Net data path struct
* @rx_ring: RX ring to remove buffers from
*
* Assumes that the device is stopped and buffers are in [0, ring->cnt - 1)
* entries. After device is disabled nfp_net_rx_ring_reset() must be called
* to restore required ring geometry.
*/
static void
nfp_net_rx_ring_bufs_free(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
unsigned int i;
for (i = 0; i < rx_ring->cnt - 1; i++) {
/* NULL skb can only happen when initial filling of the ring
* fails to allocate enough buffers and calls here to free
* already allocated ones.
*/
if (!rx_ring->rxbufs[i].frag)
continue;
nfp_net_dma_unmap_rx(dp, rx_ring->rxbufs[i].dma_addr);
nfp_net_free_frag(rx_ring->rxbufs[i].frag, dp->xdp_prog);
rx_ring->rxbufs[i].dma_addr = 0;
rx_ring->rxbufs[i].frag = NULL;
}
}
/**
* nfp_net_rx_ring_bufs_alloc() - Fill RX ring with buffers (don't give to FW)
* @dp: NFP Net data path struct
* @rx_ring: RX ring to remove buffers from
*/
static int
nfp_net_rx_ring_bufs_alloc(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
struct nfp_net_rx_buf *rxbufs;
unsigned int i;
rxbufs = rx_ring->rxbufs;
for (i = 0; i < rx_ring->cnt - 1; i++) {
rxbufs[i].frag = nfp_net_rx_alloc_one(dp, &rxbufs[i].dma_addr);
if (!rxbufs[i].frag) {
nfp_net_rx_ring_bufs_free(dp, rx_ring);
return -ENOMEM;
}
}
return 0;
}
/**
* nfp_net_rx_ring_fill_freelist() - Give buffers from the ring to FW
* @dp: NFP Net data path struct
* @rx_ring: RX ring to fill
*/
static void
nfp_net_rx_ring_fill_freelist(struct nfp_net_dp *dp,
struct nfp_net_rx_ring *rx_ring)
{
unsigned int i;
for (i = 0; i < rx_ring->cnt - 1; i++)
nfp_net_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
rx_ring->rxbufs[i].dma_addr);
}
/**
* nfp_net_rx_csum_has_errors() - group check if rxd has any csum errors
* @flags: RX descriptor flags field in CPU byte order
*/
static int nfp_net_rx_csum_has_errors(u16 flags)
{
u16 csum_all_checked, csum_all_ok;
csum_all_checked = flags & __PCIE_DESC_RX_CSUM_ALL;
csum_all_ok = flags & __PCIE_DESC_RX_CSUM_ALL_OK;
return csum_all_checked != (csum_all_ok << PCIE_DESC_RX_CSUM_OK_SHIFT);
}
/**
* nfp_net_rx_csum() - set SKB checksum field based on RX descriptor flags
* @dp: NFP Net data path struct
* @r_vec: per-ring structure
* @rxd: Pointer to RX descriptor
* @meta: Parsed metadata prepend
* @skb: Pointer to SKB
*/
static void nfp_net_rx_csum(struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec,
struct nfp_net_rx_desc *rxd,
struct nfp_meta_parsed *meta, struct sk_buff *skb)
{
skb_checksum_none_assert(skb);
if (!(dp->netdev->features & NETIF_F_RXCSUM))
return;
if (meta->csum_type) {
skb->ip_summed = meta->csum_type;
skb->csum = meta->csum;
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_complete++;
u64_stats_update_end(&r_vec->rx_sync);
return;
}
if (nfp_net_rx_csum_has_errors(le16_to_cpu(rxd->rxd.flags))) {
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_error++;
u64_stats_update_end(&r_vec->rx_sync);
return;
}
/* Assume that the firmware will never report inner CSUM_OK unless outer
* L4 headers were successfully parsed. FW will always report zero UDP
* checksum as CSUM_OK.
*/
if (rxd->rxd.flags & PCIE_DESC_RX_TCP_CSUM_OK ||
rxd->rxd.flags & PCIE_DESC_RX_UDP_CSUM_OK) {
__skb_incr_checksum_unnecessary(skb);
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_ok++;
u64_stats_update_end(&r_vec->rx_sync);
}
if (rxd->rxd.flags & PCIE_DESC_RX_I_TCP_CSUM_OK ||
rxd->rxd.flags & PCIE_DESC_RX_I_UDP_CSUM_OK) {
__skb_incr_checksum_unnecessary(skb);
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_csum_rx_inner_ok++;
u64_stats_update_end(&r_vec->rx_sync);
}
}
static void
nfp_net_set_hash(struct net_device *netdev, struct nfp_meta_parsed *meta,
unsigned int type, __be32 *hash)
{
if (!(netdev->features & NETIF_F_RXHASH))
return;
switch (type) {
case NFP_NET_RSS_IPV4:
case NFP_NET_RSS_IPV6:
case NFP_NET_RSS_IPV6_EX:
meta->hash_type = PKT_HASH_TYPE_L3;
break;
default:
meta->hash_type = PKT_HASH_TYPE_L4;
break;
}
meta->hash = get_unaligned_be32(hash);
}
static void
nfp_net_set_hash_desc(struct net_device *netdev, struct nfp_meta_parsed *meta,
void *data, struct nfp_net_rx_desc *rxd)
{
struct nfp_net_rx_hash *rx_hash = data;
if (!(rxd->rxd.flags & PCIE_DESC_RX_RSS))
return;
nfp_net_set_hash(netdev, meta, get_unaligned_be32(&rx_hash->hash_type),
&rx_hash->hash);
}
static bool
nfp_net_parse_meta(struct net_device *netdev, struct nfp_meta_parsed *meta,
void *data, void *pkt, unsigned int pkt_len, int meta_len)
{
u32 meta_info;
meta_info = get_unaligned_be32(data);
data += 4;
while (meta_info) {
switch (meta_info & NFP_NET_META_FIELD_MASK) {
case NFP_NET_META_HASH:
meta_info >>= NFP_NET_META_FIELD_SIZE;
nfp_net_set_hash(netdev, meta,
meta_info & NFP_NET_META_FIELD_MASK,
(__be32 *)data);
data += 4;
break;
case NFP_NET_META_MARK:
meta->mark = get_unaligned_be32(data);
data += 4;
break;
case NFP_NET_META_PORTID:
meta->portid = get_unaligned_be32(data);
data += 4;
break;
case NFP_NET_META_CSUM:
meta->csum_type = CHECKSUM_COMPLETE;
meta->csum =
(__force __wsum)__get_unaligned_cpu32(data);
data += 4;
break;
case NFP_NET_META_RESYNC_INFO:
if (nfp_net_tls_rx_resync_req(netdev, data, pkt,
pkt_len))
return false;
data += sizeof(struct nfp_net_tls_resync_req);
break;
default:
return true;
}
meta_info >>= NFP_NET_META_FIELD_SIZE;
}
return data != pkt;
}
static void
nfp_net_rx_drop(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
struct nfp_net_rx_ring *rx_ring, struct nfp_net_rx_buf *rxbuf,
struct sk_buff *skb)
{
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_drops++;
/* If we have both skb and rxbuf the replacement buffer allocation
* must have failed, count this as an alloc failure.
*/
if (skb && rxbuf)
r_vec->rx_replace_buf_alloc_fail++;
u64_stats_update_end(&r_vec->rx_sync);
/* skb is build based on the frag, free_skb() would free the frag
* so to be able to reuse it we need an extra ref.
*/
if (skb && rxbuf && skb->head == rxbuf->frag)
page_ref_inc(virt_to_head_page(rxbuf->frag));
if (rxbuf)
nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
if (skb)
dev_kfree_skb_any(skb);
}
static bool
nfp_net_tx_xdp_buf(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring,
struct nfp_net_tx_ring *tx_ring,
struct nfp_net_rx_buf *rxbuf, unsigned int dma_off,
unsigned int pkt_len, bool *completed)
{
unsigned int dma_map_sz = dp->fl_bufsz - NFP_NET_RX_BUF_NON_DATA;
struct nfp_net_tx_buf *txbuf;
struct nfp_net_tx_desc *txd;
int wr_idx;
/* Reject if xdp_adjust_tail grow packet beyond DMA area */
if (pkt_len + dma_off > dma_map_sz)
return false;
if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
if (!*completed) {
nfp_net_xdp_complete(tx_ring);
*completed = true;
}
if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
nfp_net_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
NULL);
return false;
}
}
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
nfp_net_rx_give_one(dp, rx_ring, txbuf->frag, txbuf->dma_addr);
txbuf->frag = rxbuf->frag;
txbuf->dma_addr = rxbuf->dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = pkt_len;
dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
pkt_len, DMA_BIDIRECTIONAL);
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = PCIE_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(pkt_len);
nfp_desc_set_dma_addr(txd, rxbuf->dma_addr + dma_off);
txd->data_len = cpu_to_le16(pkt_len);
txd->flags = 0;
txd->mss = 0;
txd->lso_hdrlen = 0;
tx_ring->wr_p++;
tx_ring->wr_ptr_add++;
return true;
}
/**
* nfp_net_rx() - receive up to @budget packets on @rx_ring
* @rx_ring: RX ring to receive from
* @budget: NAPI budget
*
* Note, this function is separated out from the napi poll function to
* more cleanly separate packet receive code from other bookkeeping
* functions performed in the napi poll function.
*
* Return: Number of packets received.
*/
static int nfp_net_rx(struct nfp_net_rx_ring *rx_ring, int budget)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
struct nfp_net_tx_ring *tx_ring;
struct bpf_prog *xdp_prog;
bool xdp_tx_cmpl = false;
unsigned int true_bufsz;
struct sk_buff *skb;
int pkts_polled = 0;
struct xdp_buff xdp;
int idx;
xdp_prog = READ_ONCE(dp->xdp_prog);
true_bufsz = xdp_prog ? PAGE_SIZE : dp->fl_bufsz;
xdp_init_buff(&xdp, PAGE_SIZE - NFP_NET_RX_BUF_HEADROOM,
&rx_ring->xdp_rxq);
tx_ring = r_vec->xdp_ring;
while (pkts_polled < budget) {
unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
struct nfp_net_rx_buf *rxbuf;
struct nfp_net_rx_desc *rxd;
struct nfp_meta_parsed meta;
bool redir_egress = false;
struct net_device *netdev;
dma_addr_t new_dma_addr;
u32 meta_len_xdp = 0;
void *new_frag;
idx = D_IDX(rx_ring, rx_ring->rd_p);
rxd = &rx_ring->rxds[idx];
if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
break;
/* Memory barrier to ensure that we won't do other reads
* before the DD bit.
*/
dma_rmb();
memset(&meta, 0, sizeof(meta));
rx_ring->rd_p++;
pkts_polled++;
rxbuf = &rx_ring->rxbufs[idx];
/* < meta_len >
* <-- [rx_offset] -->
* ---------------------------------------------------------
* | [XX] | metadata | packet | XXXX |
* ---------------------------------------------------------
* <---------------- data_len --------------->
*
* The rx_offset is fixed for all packets, the meta_len can vary
* on a packet by packet basis. If rx_offset is set to zero
* (_RX_OFFSET_DYNAMIC) metadata starts at the beginning of the
* buffer and is immediately followed by the packet (no [XX]).
*/
meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
data_len = le16_to_cpu(rxd->rxd.data_len);
pkt_len = data_len - meta_len;
pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
pkt_off += meta_len;
else
pkt_off += dp->rx_offset;
meta_off = pkt_off - meta_len;
/* Stats update */
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_pkts++;
r_vec->rx_bytes += pkt_len;
u64_stats_update_end(&r_vec->rx_sync);
if (unlikely(meta_len > NFP_NET_MAX_PREPEND ||
(dp->rx_offset && meta_len > dp->rx_offset))) {
nn_dp_warn(dp, "oversized RX packet metadata %u\n",
meta_len);
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
continue;
}
nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off,
data_len);
if (!dp->chained_metadata_format) {
nfp_net_set_hash_desc(dp->netdev, &meta,
rxbuf->frag + meta_off, rxd);
} else if (meta_len) {
if (unlikely(nfp_net_parse_meta(dp->netdev, &meta,
rxbuf->frag + meta_off,
rxbuf->frag + pkt_off,
pkt_len, meta_len))) {
nn_dp_warn(dp, "invalid RX packet metadata\n");
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf,
NULL);
continue;
}
}
if (xdp_prog && !meta.portid) {
void *orig_data = rxbuf->frag + pkt_off;
unsigned int dma_off;
int act;
xdp_prepare_buff(&xdp,
rxbuf->frag + NFP_NET_RX_BUF_HEADROOM,
pkt_off - NFP_NET_RX_BUF_HEADROOM,
pkt_len, true);
act = bpf_prog_run_xdp(xdp_prog, &xdp);
pkt_len = xdp.data_end - xdp.data;
pkt_off += xdp.data - orig_data;
switch (act) {
case XDP_PASS:
meta_len_xdp = xdp.data - xdp.data_meta;
break;
case XDP_TX:
dma_off = pkt_off - NFP_NET_RX_BUF_HEADROOM;
if (unlikely(!nfp_net_tx_xdp_buf(dp, rx_ring,
tx_ring, rxbuf,
dma_off,
pkt_len,
&xdp_tx_cmpl)))
trace_xdp_exception(dp->netdev,
xdp_prog, act);
continue;
default:
bpf_warn_invalid_xdp_action(act);
fallthrough;
case XDP_ABORTED:
trace_xdp_exception(dp->netdev, xdp_prog, act);
fallthrough;
case XDP_DROP:
nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag,
rxbuf->dma_addr);
continue;
}
}
if (likely(!meta.portid)) {
netdev = dp->netdev;
} else if (meta.portid == NFP_META_PORT_ID_CTRL) {
struct nfp_net *nn = netdev_priv(dp->netdev);
nfp_app_ctrl_rx_raw(nn->app, rxbuf->frag + pkt_off,
pkt_len);
nfp_net_rx_give_one(dp, rx_ring, rxbuf->frag,
rxbuf->dma_addr);
continue;
} else {
struct nfp_net *nn;
nn = netdev_priv(dp->netdev);
netdev = nfp_app_dev_get(nn->app, meta.portid,
&redir_egress);
if (unlikely(!netdev)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf,
NULL);
continue;
}
if (nfp_netdev_is_nfp_repr(netdev))
nfp_repr_inc_rx_stats(netdev, pkt_len);
}
skb = build_skb(rxbuf->frag, true_bufsz);
if (unlikely(!skb)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
continue;
}
new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
continue;
}
nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
skb_reserve(skb, pkt_off);
skb_put(skb, pkt_len);
skb->mark = meta.mark;
skb_set_hash(skb, meta.hash, meta.hash_type);
skb_record_rx_queue(skb, rx_ring->idx);
skb->protocol = eth_type_trans(skb, netdev);
nfp_net_rx_csum(dp, r_vec, rxd, &meta, skb);
#ifdef CONFIG_TLS_DEVICE
if (rxd->rxd.flags & PCIE_DESC_RX_DECRYPTED) {
skb->decrypted = true;
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->hw_tls_rx++;
u64_stats_update_end(&r_vec->rx_sync);
}
#endif
if (rxd->rxd.flags & PCIE_DESC_RX_VLAN)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
le16_to_cpu(rxd->rxd.vlan));
if (meta_len_xdp)
skb_metadata_set(skb, meta_len_xdp);
if (likely(!redir_egress)) {
napi_gro_receive(&rx_ring->r_vec->napi, skb);
} else {
skb->dev = netdev;
skb_reset_network_header(skb);
__skb_push(skb, ETH_HLEN);
dev_queue_xmit(skb);
}
}
if (xdp_prog) {
if (tx_ring->wr_ptr_add)
nfp_net_tx_xmit_more_flush(tx_ring);
else if (unlikely(tx_ring->wr_p != tx_ring->rd_p) &&
!xdp_tx_cmpl)
if (!nfp_net_xdp_complete(tx_ring))
pkts_polled = budget;
}
return pkts_polled;
}
/**
* nfp_net_poll() - napi poll function
* @napi: NAPI structure
* @budget: NAPI budget
*
* Return: number of packets polled.
*/
static int nfp_net_poll(struct napi_struct *napi, int budget)
{
struct nfp_net_r_vector *r_vec =
container_of(napi, struct nfp_net_r_vector, napi);
unsigned int pkts_polled = 0;
if (r_vec->tx_ring)
nfp_net_tx_complete(r_vec->tx_ring, budget);
if (r_vec->rx_ring)
pkts_polled = nfp_net_rx(r_vec->rx_ring, budget);
if (pkts_polled < budget)
if (napi_complete_done(napi, pkts_polled))
nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
if (r_vec->nfp_net->rx_coalesce_adapt_on && r_vec->rx_ring) {
struct dim_sample dim_sample = {};
unsigned int start;
u64 pkts, bytes;
do {
start = u64_stats_fetch_begin(&r_vec->rx_sync);
pkts = r_vec->rx_pkts;
bytes = r_vec->rx_bytes;
} while (u64_stats_fetch_retry(&r_vec->rx_sync, start));
dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
net_dim(&r_vec->rx_dim, dim_sample);
}
if (r_vec->nfp_net->tx_coalesce_adapt_on && r_vec->tx_ring) {
struct dim_sample dim_sample = {};
unsigned int start;
u64 pkts, bytes;
do {
start = u64_stats_fetch_begin(&r_vec->tx_sync);
pkts = r_vec->tx_pkts;
bytes = r_vec->tx_bytes;
} while (u64_stats_fetch_retry(&r_vec->tx_sync, start));
dim_update_sample(r_vec->event_ctr, pkts, bytes, &dim_sample);
net_dim(&r_vec->tx_dim, dim_sample);
}
return pkts_polled;
}
/* Control device data path
*/
static bool
nfp_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
struct sk_buff *skb, bool old)
{
unsigned int real_len = skb->len, meta_len = 0;
struct nfp_net_tx_ring *tx_ring;
struct nfp_net_tx_buf *txbuf;
struct nfp_net_tx_desc *txd;
struct nfp_net_dp *dp;
dma_addr_t dma_addr;
int wr_idx;
dp = &r_vec->nfp_net->dp;
tx_ring = r_vec->tx_ring;
if (WARN_ON_ONCE(skb_shinfo(skb)->nr_frags)) {
nn_dp_warn(dp, "Driver's CTRL TX does not implement gather\n");
goto err_free;
}
if (unlikely(nfp_net_tx_full(tx_ring, 1))) {
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_busy++;
u64_stats_update_end(&r_vec->tx_sync);
if (!old)
__skb_queue_tail(&r_vec->queue, skb);
else
__skb_queue_head(&r_vec->queue, skb);
return true;
}
if (nfp_app_ctrl_has_meta(nn->app)) {
if (unlikely(skb_headroom(skb) < 8)) {
nn_dp_warn(dp, "CTRL TX on skb without headroom\n");
goto err_free;
}
meta_len = 8;
put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
put_unaligned_be32(NFP_NET_META_PORTID, skb_push(skb, 4));
}
/* Start with the head skbuf */
dma_addr = dma_map_single(dp->dev, skb->data, skb_headlen(skb),
DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_dma_warn;
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
/* Stash the soft descriptor of the head then initialize it */
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->skb = skb;
txbuf->dma_addr = dma_addr;
txbuf->fidx = -1;
txbuf->pkt_cnt = 1;
txbuf->real_len = real_len;
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = meta_len | PCIE_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(skb_headlen(skb));
nfp_desc_set_dma_addr(txd, dma_addr);
txd->data_len = cpu_to_le16(skb->len);
txd->flags = 0;
txd->mss = 0;
txd->lso_hdrlen = 0;
tx_ring->wr_p++;
tx_ring->wr_ptr_add++;
nfp_net_tx_xmit_more_flush(tx_ring);
return false;
err_dma_warn:
nn_dp_warn(dp, "Failed to DMA map TX CTRL buffer\n");
err_free:
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_errors++;
u64_stats_update_end(&r_vec->tx_sync);
dev_kfree_skb_any(skb);
return false;
}
bool __nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb)
{
struct nfp_net_r_vector *r_vec = &nn->r_vecs[0];
return nfp_ctrl_tx_one(nn, r_vec, skb, false);
}
bool nfp_ctrl_tx(struct nfp_net *nn, struct sk_buff *skb)
{
struct nfp_net_r_vector *r_vec = &nn->r_vecs[0];
bool ret;
spin_lock_bh(&r_vec->lock);
ret = nfp_ctrl_tx_one(nn, r_vec, skb, false);
spin_unlock_bh(&r_vec->lock);
return ret;
}
static void __nfp_ctrl_tx_queued(struct nfp_net_r_vector *r_vec)
{
struct sk_buff *skb;
while ((skb = __skb_dequeue(&r_vec->queue)))
if (nfp_ctrl_tx_one(r_vec->nfp_net, r_vec, skb, true))
return;
}
static bool
nfp_ctrl_meta_ok(struct nfp_net *nn, void *data, unsigned int meta_len)
{
u32 meta_type, meta_tag;
if (!nfp_app_ctrl_has_meta(nn->app))
return !meta_len;
if (meta_len != 8)
return false;
meta_type = get_unaligned_be32(data);
meta_tag = get_unaligned_be32(data + 4);
return (meta_type == NFP_NET_META_PORTID &&
meta_tag == NFP_META_PORT_ID_CTRL);
}
static bool
nfp_ctrl_rx_one(struct nfp_net *nn, struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec, struct nfp_net_rx_ring *rx_ring)
{
unsigned int meta_len, data_len, meta_off, pkt_len, pkt_off;
struct nfp_net_rx_buf *rxbuf;
struct nfp_net_rx_desc *rxd;
dma_addr_t new_dma_addr;
struct sk_buff *skb;
void *new_frag;
int idx;
idx = D_IDX(rx_ring, rx_ring->rd_p);
rxd = &rx_ring->rxds[idx];
if (!(rxd->rxd.meta_len_dd & PCIE_DESC_RX_DD))
return false;
/* Memory barrier to ensure that we won't do other reads
* before the DD bit.
*/
dma_rmb();
rx_ring->rd_p++;
rxbuf = &rx_ring->rxbufs[idx];
meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
data_len = le16_to_cpu(rxd->rxd.data_len);
pkt_len = data_len - meta_len;
pkt_off = NFP_NET_RX_BUF_HEADROOM + dp->rx_dma_off;
if (dp->rx_offset == NFP_NET_CFG_RX_OFFSET_DYNAMIC)
pkt_off += meta_len;
else
pkt_off += dp->rx_offset;
meta_off = pkt_off - meta_len;
/* Stats update */
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_pkts++;
r_vec->rx_bytes += pkt_len;
u64_stats_update_end(&r_vec->rx_sync);
nfp_net_dma_sync_cpu_rx(dp, rxbuf->dma_addr + meta_off, data_len);
if (unlikely(!nfp_ctrl_meta_ok(nn, rxbuf->frag + meta_off, meta_len))) {
nn_dp_warn(dp, "incorrect metadata for ctrl packet (%d)\n",
meta_len);
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
return true;
}
skb = build_skb(rxbuf->frag, dp->fl_bufsz);
if (unlikely(!skb)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
return true;
}
new_frag = nfp_net_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_net_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
return true;
}
nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
nfp_net_rx_give_one(dp, rx_ring, new_frag, new_dma_addr);
skb_reserve(skb, pkt_off);
skb_put(skb, pkt_len);
nfp_app_ctrl_rx(nn->app, skb);
return true;
}
static bool nfp_ctrl_rx(struct nfp_net_r_vector *r_vec)
{
struct nfp_net_rx_ring *rx_ring = r_vec->rx_ring;
struct nfp_net *nn = r_vec->nfp_net;
struct nfp_net_dp *dp = &nn->dp;
unsigned int budget = 512;
while (nfp_ctrl_rx_one(nn, dp, r_vec, rx_ring) && budget--)
continue;
return budget;
}
static void nfp_ctrl_poll(struct tasklet_struct *t)
{
struct nfp_net_r_vector *r_vec = from_tasklet(r_vec, t, tasklet);
spin_lock(&r_vec->lock);
nfp_net_tx_complete(r_vec->tx_ring, 0);
__nfp_ctrl_tx_queued(r_vec);
spin_unlock(&r_vec->lock);
if (nfp_ctrl_rx(r_vec)) {
nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
} else {
tasklet_schedule(&r_vec->tasklet);
nn_dp_warn(&r_vec->nfp_net->dp,
"control message budget exceeded!\n");
}
}
/* Setup and Configuration
*/
/**
* nfp_net_vecs_init() - Assign IRQs and setup rvecs.
* @nn: NFP Network structure
*/
static void nfp_net_vecs_init(struct nfp_net *nn)
{
struct nfp_net_r_vector *r_vec;
int r;
nn->lsc_handler = nfp_net_irq_lsc;
nn->exn_handler = nfp_net_irq_exn;
for (r = 0; r < nn->max_r_vecs; r++) {
struct msix_entry *entry;
entry = &nn->irq_entries[NFP_NET_NON_Q_VECTORS + r];
r_vec = &nn->r_vecs[r];
r_vec->nfp_net = nn;
r_vec->irq_entry = entry->entry;
r_vec->irq_vector = entry->vector;
if (nn->dp.netdev) {
r_vec->handler = nfp_net_irq_rxtx;
} else {
r_vec->handler = nfp_ctrl_irq_rxtx;
__skb_queue_head_init(&r_vec->queue);
spin_lock_init(&r_vec->lock);
tasklet_setup(&r_vec->tasklet, nfp_ctrl_poll);
tasklet_disable(&r_vec->tasklet);
}
cpumask_set_cpu(r, &r_vec->affinity_mask);
}
}
/**
* nfp_net_tx_ring_free() - Free resources allocated to a TX ring
* @tx_ring: TX ring to free
*/
static void nfp_net_tx_ring_free(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
kvfree(tx_ring->txbufs);
if (tx_ring->txds)
dma_free_coherent(dp->dev, tx_ring->size,
tx_ring->txds, tx_ring->dma);
tx_ring->cnt = 0;
tx_ring->txbufs = NULL;
tx_ring->txds = NULL;
tx_ring->dma = 0;
tx_ring->size = 0;
}
/**
* nfp_net_tx_ring_alloc() - Allocate resource for a TX ring
* @dp: NFP Net data path struct
* @tx_ring: TX Ring structure to allocate
*
* Return: 0 on success, negative errno otherwise.
*/
static int
nfp_net_tx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
tx_ring->cnt = dp->txd_cnt;
tx_ring->size = array_size(tx_ring->cnt, sizeof(*tx_ring->txds));
tx_ring->txds = dma_alloc_coherent(dp->dev, tx_ring->size,
&tx_ring->dma,
GFP_KERNEL | __GFP_NOWARN);
if (!tx_ring->txds) {
netdev_warn(dp->netdev, "failed to allocate TX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n",
tx_ring->cnt);
goto err_alloc;
}
tx_ring->txbufs = kvcalloc(tx_ring->cnt, sizeof(*tx_ring->txbufs),
GFP_KERNEL);
if (!tx_ring->txbufs)
goto err_alloc;
if (!tx_ring->is_xdp && dp->netdev)
netif_set_xps_queue(dp->netdev, &r_vec->affinity_mask,
tx_ring->idx);
return 0;
err_alloc:
nfp_net_tx_ring_free(tx_ring);
return -ENOMEM;
}
static void
nfp_net_tx_ring_bufs_free(struct nfp_net_dp *dp,
struct nfp_net_tx_ring *tx_ring)
{
unsigned int i;
if (!tx_ring->is_xdp)
return;
for (i = 0; i < tx_ring->cnt; i++) {
if (!tx_ring->txbufs[i].frag)
return;
nfp_net_dma_unmap_rx(dp, tx_ring->txbufs[i].dma_addr);
__free_page(virt_to_page(tx_ring->txbufs[i].frag));
}
}
static int
nfp_net_tx_ring_bufs_alloc(struct nfp_net_dp *dp,
struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_tx_buf *txbufs = tx_ring->txbufs;
unsigned int i;
if (!tx_ring->is_xdp)
return 0;
for (i = 0; i < tx_ring->cnt; i++) {
txbufs[i].frag = nfp_net_rx_alloc_one(dp, &txbufs[i].dma_addr);
if (!txbufs[i].frag) {
nfp_net_tx_ring_bufs_free(dp, tx_ring);
return -ENOMEM;
}
}
return 0;
}
static int nfp_net_tx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
{
unsigned int r;
dp->tx_rings = kcalloc(dp->num_tx_rings, sizeof(*dp->tx_rings),
GFP_KERNEL);
if (!dp->tx_rings)
return -ENOMEM;
for (r = 0; r < dp->num_tx_rings; r++) {
int bias = 0;
if (r >= dp->num_stack_tx_rings)
bias = dp->num_stack_tx_rings;
nfp_net_tx_ring_init(&dp->tx_rings[r], &nn->r_vecs[r - bias],
r, bias);
if (nfp_net_tx_ring_alloc(dp, &dp->tx_rings[r]))
goto err_free_prev;
if (nfp_net_tx_ring_bufs_alloc(dp, &dp->tx_rings[r]))
goto err_free_ring;
}
return 0;
err_free_prev:
while (r--) {
nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]);
err_free_ring:
nfp_net_tx_ring_free(&dp->tx_rings[r]);
}
kfree(dp->tx_rings);
return -ENOMEM;
}
static void nfp_net_tx_rings_free(struct nfp_net_dp *dp)
{
unsigned int r;
for (r = 0; r < dp->num_tx_rings; r++) {
nfp_net_tx_ring_bufs_free(dp, &dp->tx_rings[r]);
nfp_net_tx_ring_free(&dp->tx_rings[r]);
}
kfree(dp->tx_rings);
}
/**
* nfp_net_rx_ring_free() - Free resources allocated to a RX ring
* @rx_ring: RX ring to free
*/
static void nfp_net_rx_ring_free(struct nfp_net_rx_ring *rx_ring)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
if (dp->netdev)
xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
kvfree(rx_ring->rxbufs);
if (rx_ring->rxds)
dma_free_coherent(dp->dev, rx_ring->size,
rx_ring->rxds, rx_ring->dma);
rx_ring->cnt = 0;
rx_ring->rxbufs = NULL;
rx_ring->rxds = NULL;
rx_ring->dma = 0;
rx_ring->size = 0;
}
/**
* nfp_net_rx_ring_alloc() - Allocate resource for a RX ring
* @dp: NFP Net data path struct
* @rx_ring: RX ring to allocate
*
* Return: 0 on success, negative errno otherwise.
*/
static int
nfp_net_rx_ring_alloc(struct nfp_net_dp *dp, struct nfp_net_rx_ring *rx_ring)
{
int err;
if (dp->netdev) {
err = xdp_rxq_info_reg(&rx_ring->xdp_rxq, dp->netdev,
rx_ring->idx, rx_ring->r_vec->napi.napi_id);
if (err < 0)
return err;
}
rx_ring->cnt = dp->rxd_cnt;
rx_ring->size = array_size(rx_ring->cnt, sizeof(*rx_ring->rxds));
rx_ring->rxds = dma_alloc_coherent(dp->dev, rx_ring->size,
&rx_ring->dma,
GFP_KERNEL | __GFP_NOWARN);
if (!rx_ring->rxds) {
netdev_warn(dp->netdev, "failed to allocate RX descriptor ring memory, requested descriptor count: %d, consider lowering descriptor count\n",
rx_ring->cnt);
goto err_alloc;
}
rx_ring->rxbufs = kvcalloc(rx_ring->cnt, sizeof(*rx_ring->rxbufs),
GFP_KERNEL);
if (!rx_ring->rxbufs)
goto err_alloc;
return 0;
err_alloc:
nfp_net_rx_ring_free(rx_ring);
return -ENOMEM;
}
static int nfp_net_rx_rings_prepare(struct nfp_net *nn, struct nfp_net_dp *dp)
{
unsigned int r;
dp->rx_rings = kcalloc(dp->num_rx_rings, sizeof(*dp->rx_rings),
GFP_KERNEL);
if (!dp->rx_rings)
return -ENOMEM;
for (r = 0; r < dp->num_rx_rings; r++) {
nfp_net_rx_ring_init(&dp->rx_rings[r], &nn->r_vecs[r], r);
if (nfp_net_rx_ring_alloc(dp, &dp->rx_rings[r]))
goto err_free_prev;
if (nfp_net_rx_ring_bufs_alloc(dp, &dp->rx_rings[r]))
goto err_free_ring;
}
return 0;
err_free_prev:
while (r--) {
nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
err_free_ring:
nfp_net_rx_ring_free(&dp->rx_rings[r]);
}
kfree(dp->rx_rings);
return -ENOMEM;
}
static void nfp_net_rx_rings_free(struct nfp_net_dp *dp)
{
unsigned int r;
for (r = 0; r < dp->num_rx_rings; r++) {
nfp_net_rx_ring_bufs_free(dp, &dp->rx_rings[r]);
nfp_net_rx_ring_free(&dp->rx_rings[r]);
}
kfree(dp->rx_rings);
}
static void
nfp_net_vector_assign_rings(struct nfp_net_dp *dp,
struct nfp_net_r_vector *r_vec, int idx)
{
r_vec->rx_ring = idx < dp->num_rx_rings ? &dp->rx_rings[idx] : NULL;
r_vec->tx_ring =
idx < dp->num_stack_tx_rings ? &dp->tx_rings[idx] : NULL;
r_vec->xdp_ring = idx < dp->num_tx_rings - dp->num_stack_tx_rings ?
&dp->tx_rings[dp->num_stack_tx_rings + idx] : NULL;
}
static int
nfp_net_prepare_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
int idx)
{
int err;
/* Setup NAPI */
if (nn->dp.netdev)
netif_napi_add(nn->dp.netdev, &r_vec->napi,
nfp_net_poll, NAPI_POLL_WEIGHT);
else
tasklet_enable(&r_vec->tasklet);
snprintf(r_vec->name, sizeof(r_vec->name),
"%s-rxtx-%d", nfp_net_name(nn), idx);
err = request_irq(r_vec->irq_vector, r_vec->handler, 0, r_vec->name,
r_vec);
if (err) {
if (nn->dp.netdev)
netif_napi_del(&r_vec->napi);
else
tasklet_disable(&r_vec->tasklet);
nn_err(nn, "Error requesting IRQ %d\n", r_vec->irq_vector);
return err;
}
disable_irq(r_vec->irq_vector);
irq_set_affinity_hint(r_vec->irq_vector, &r_vec->affinity_mask);
nn_dbg(nn, "RV%02d: irq=%03d/%03d\n", idx, r_vec->irq_vector,
r_vec->irq_entry);
return 0;
}
static void
nfp_net_cleanup_vector(struct nfp_net *nn, struct nfp_net_r_vector *r_vec)
{
irq_set_affinity_hint(r_vec->irq_vector, NULL);
if (nn->dp.netdev)
netif_napi_del(&r_vec->napi);
else
tasklet_disable(&r_vec->tasklet);
free_irq(r_vec->irq_vector, r_vec);
}
/**
* nfp_net_rss_write_itbl() - Write RSS indirection table to device
* @nn: NFP Net device to reconfigure
*/
void nfp_net_rss_write_itbl(struct nfp_net *nn)
{
int i;
for (i = 0; i < NFP_NET_CFG_RSS_ITBL_SZ; i += 4)
nn_writel(nn, NFP_NET_CFG_RSS_ITBL + i,
get_unaligned_le32(nn->rss_itbl + i));
}
/**
* nfp_net_rss_write_key() - Write RSS hash key to device
* @nn: NFP Net device to reconfigure
*/
void nfp_net_rss_write_key(struct nfp_net *nn)
{
int i;
for (i = 0; i < nfp_net_rss_key_sz(nn); i += 4)
nn_writel(nn, NFP_NET_CFG_RSS_KEY + i,
get_unaligned_le32(nn->rss_key + i));
}
/**
* nfp_net_coalesce_write_cfg() - Write irq coalescence configuration to HW
* @nn: NFP Net device to reconfigure
*/
void nfp_net_coalesce_write_cfg(struct nfp_net *nn)
{
u8 i;
u32 factor;
u32 value;
/* Compute factor used to convert coalesce '_usecs' parameters to
* ME timestamp ticks. There are 16 ME clock cycles for each timestamp
* count.
*/
factor = nn->tlv_caps.me_freq_mhz / 16;
/* copy RX interrupt coalesce parameters */
value = (nn->rx_coalesce_max_frames << 16) |
(factor * nn->rx_coalesce_usecs);
for (i = 0; i < nn->dp.num_rx_rings; i++)
nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(i), value);
/* copy TX interrupt coalesce parameters */
value = (nn->tx_coalesce_max_frames << 16) |
(factor * nn->tx_coalesce_usecs);
for (i = 0; i < nn->dp.num_tx_rings; i++)
nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(i), value);
}
/**
* nfp_net_write_mac_addr() - Write mac address to the device control BAR
* @nn: NFP Net device to reconfigure
* @addr: MAC address to write
*
* Writes the MAC address from the netdev to the device control BAR. Does not
* perform the required reconfig. We do a bit of byte swapping dance because
* firmware is LE.
*/
static void nfp_net_write_mac_addr(struct nfp_net *nn, const u8 *addr)
{
nn_writel(nn, NFP_NET_CFG_MACADDR + 0, get_unaligned_be32(addr));
nn_writew(nn, NFP_NET_CFG_MACADDR + 6, get_unaligned_be16(addr + 4));
}
static void nfp_net_vec_clear_ring_data(struct nfp_net *nn, unsigned int idx)
{
nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), 0);
nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), 0);
nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), 0);
nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), 0);
nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), 0);
nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), 0);
}
/**
* nfp_net_clear_config_and_disable() - Clear control BAR and disable NFP
* @nn: NFP Net device to reconfigure
*
* Warning: must be fully idempotent.
*/
static void nfp_net_clear_config_and_disable(struct nfp_net *nn)
{
u32 new_ctrl, update;
unsigned int r;
int err;
new_ctrl = nn->dp.ctrl;
new_ctrl &= ~NFP_NET_CFG_CTRL_ENABLE;
update = NFP_NET_CFG_UPDATE_GEN;
update |= NFP_NET_CFG_UPDATE_MSIX;
update |= NFP_NET_CFG_UPDATE_RING;
if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
new_ctrl &= ~NFP_NET_CFG_CTRL_RINGCFG;
nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, 0);
nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, 0);
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, update);
if (err)
nn_err(nn, "Could not disable device: %d\n", err);
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_reset(&nn->dp.rx_rings[r]);
for (r = 0; r < nn->dp.num_tx_rings; r++)
nfp_net_tx_ring_reset(&nn->dp, &nn->dp.tx_rings[r]);
for (r = 0; r < nn->dp.num_r_vecs; r++)
nfp_net_vec_clear_ring_data(nn, r);
nn->dp.ctrl = new_ctrl;
}
static void
nfp_net_rx_ring_hw_cfg_write(struct nfp_net *nn,
struct nfp_net_rx_ring *rx_ring, unsigned int idx)
{
/* Write the DMA address, size and MSI-X info to the device */
nn_writeq(nn, NFP_NET_CFG_RXR_ADDR(idx), rx_ring->dma);
nn_writeb(nn, NFP_NET_CFG_RXR_SZ(idx), ilog2(rx_ring->cnt));
nn_writeb(nn, NFP_NET_CFG_RXR_VEC(idx), rx_ring->r_vec->irq_entry);
}
static void
nfp_net_tx_ring_hw_cfg_write(struct nfp_net *nn,
struct nfp_net_tx_ring *tx_ring, unsigned int idx)
{
nn_writeq(nn, NFP_NET_CFG_TXR_ADDR(idx), tx_ring->dma);
nn_writeb(nn, NFP_NET_CFG_TXR_SZ(idx), ilog2(tx_ring->cnt));
nn_writeb(nn, NFP_NET_CFG_TXR_VEC(idx), tx_ring->r_vec->irq_entry);
}
/**
* nfp_net_set_config_and_enable() - Write control BAR and enable NFP
* @nn: NFP Net device to reconfigure
*/
static int nfp_net_set_config_and_enable(struct nfp_net *nn)
{
u32 bufsz, new_ctrl, update = 0;
unsigned int r;
int err;
new_ctrl = nn->dp.ctrl;
if (nn->dp.ctrl & NFP_NET_CFG_CTRL_RSS_ANY) {
nfp_net_rss_write_key(nn);
nfp_net_rss_write_itbl(nn);
nn_writel(nn, NFP_NET_CFG_RSS_CTRL, nn->rss_cfg);
update |= NFP_NET_CFG_UPDATE_RSS;
}
if (nn->dp.ctrl & NFP_NET_CFG_CTRL_IRQMOD) {
nfp_net_coalesce_write_cfg(nn);
update |= NFP_NET_CFG_UPDATE_IRQMOD;
}
for (r = 0; r < nn->dp.num_tx_rings; r++)
nfp_net_tx_ring_hw_cfg_write(nn, &nn->dp.tx_rings[r], r);
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_hw_cfg_write(nn, &nn->dp.rx_rings[r], r);
nn_writeq(nn, NFP_NET_CFG_TXRS_ENABLE, nn->dp.num_tx_rings == 64 ?
0xffffffffffffffffULL : ((u64)1 << nn->dp.num_tx_rings) - 1);
nn_writeq(nn, NFP_NET_CFG_RXRS_ENABLE, nn->dp.num_rx_rings == 64 ?
0xffffffffffffffffULL : ((u64)1 << nn->dp.num_rx_rings) - 1);
if (nn->dp.netdev)
nfp_net_write_mac_addr(nn, nn->dp.netdev->dev_addr);
nn_writel(nn, NFP_NET_CFG_MTU, nn->dp.mtu);
bufsz = nn->dp.fl_bufsz - nn->dp.rx_dma_off - NFP_NET_RX_BUF_NON_DATA;
nn_writel(nn, NFP_NET_CFG_FLBUFSZ, bufsz);
/* Enable device */
new_ctrl |= NFP_NET_CFG_CTRL_ENABLE;
update |= NFP_NET_CFG_UPDATE_GEN;
update |= NFP_NET_CFG_UPDATE_MSIX;
update |= NFP_NET_CFG_UPDATE_RING;
if (nn->cap & NFP_NET_CFG_CTRL_RINGCFG)
new_ctrl |= NFP_NET_CFG_CTRL_RINGCFG;
nn_writel(nn, NFP_NET_CFG_CTRL, new_ctrl);
err = nfp_net_reconfig(nn, update);
if (err) {
nfp_net_clear_config_and_disable(nn);
return err;
}
nn->dp.ctrl = new_ctrl;
for (r = 0; r < nn->dp.num_rx_rings; r++)
nfp_net_rx_ring_fill_freelist(&nn->dp, &nn->dp.rx_rings[r]);
return 0;
}
/**
* nfp_net_close_stack() - Quiesce the stack (part of close)
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_close_stack(struct nfp_net *nn)
{
struct nfp_net_r_vector *r_vec;
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++) {
r_vec = &nn->r_vecs[r];
disable_irq(r_vec->irq_vector);
napi_disable(&r_vec->napi);
if (r_vec->rx_ring)
cancel_work_sync(&r_vec->rx_dim.work);
if (r_vec->tx_ring)
cancel_work_sync(&r_vec->tx_dim.work);
}
netif_tx_disable(nn->dp.netdev);
}
/**
* nfp_net_close_free_all() - Free all runtime resources
* @nn: NFP Net device to reconfigure
*/
static void nfp_net_close_free_all(struct nfp_net *nn)
{
unsigned int r;
nfp_net_tx_rings_free(&nn->dp);
nfp_net_rx_rings_free(&nn->dp);
for (r = 0; r < nn->dp.num_r_vecs; r++)
nfp_net_cleanup_vector(nn, &nn->r_vecs[r]);
nfp_net_aux_irq_free(nn, NFP_NET_CFG_LSC, NFP_NET_IRQ_LSC_IDX);
nfp_net_aux_irq_free(nn, NFP_NET_CFG_EXN, NFP_NET_IRQ_EXN_IDX);
}
/**
* nfp_net_netdev_close() - Called when the device is downed
* @netdev: netdev structure
*/
static int nfp_net_netdev_close(struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
/* Step 1: Disable RX and TX rings from the Linux kernel perspective
*/
nfp_net_close_stack(nn);
/* Step 2: Tell NFP
*/
nfp_net_clear_config_and_disable(nn);
nfp_port_configure(netdev, false);
/* Step 3: Free resources
*/
nfp_net_close_free_all(nn);
nn_dbg(nn, "%s down", netdev->name);
return 0;
}
void nfp_ctrl_close(struct nfp_net *nn)
{
int r;
rtnl_lock();
for (r = 0; r < nn->dp.num_r_vecs; r++) {
disable_irq(nn->r_vecs[r].irq_vector);
tasklet_disable(&nn->r_vecs[r].tasklet);
}
nfp_net_clear_config_and_disable(nn);
nfp_net_close_free_all(nn);
rtnl_unlock();
}
static void nfp_net_rx_dim_work(struct work_struct *work)
{
struct nfp_net_r_vector *r_vec;
unsigned int factor, value;
struct dim_cq_moder moder;
struct nfp_net *nn;
struct dim *dim;
dim = container_of(work, struct dim, work);
moder = net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
r_vec = container_of(dim, struct nfp_net_r_vector, rx_dim);
nn = r_vec->nfp_net;
/* Compute factor used to convert coalesce '_usecs' parameters to
* ME timestamp ticks. There are 16 ME clock cycles for each timestamp
* count.
*/
factor = nn->tlv_caps.me_freq_mhz / 16;
if (nfp_net_coalesce_para_check(factor * moder.usec, moder.pkts))
return;
/* copy RX interrupt coalesce parameters */
value = (moder.pkts << 16) | (factor * moder.usec);
nn_writel(nn, NFP_NET_CFG_RXR_IRQ_MOD(r_vec->rx_ring->idx), value);
(void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD);
dim->state = DIM_START_MEASURE;
}
static void nfp_net_tx_dim_work(struct work_struct *work)
{
struct nfp_net_r_vector *r_vec;
unsigned int factor, value;
struct dim_cq_moder moder;
struct nfp_net *nn;
struct dim *dim;
dim = container_of(work, struct dim, work);
moder = net_dim_get_tx_moderation(dim->mode, dim->profile_ix);
r_vec = container_of(dim, struct nfp_net_r_vector, tx_dim);
nn = r_vec->nfp_net;
/* Compute factor used to convert coalesce '_usecs' parameters to
* ME timestamp ticks. There are 16 ME clock cycles for each timestamp
* count.
*/
factor = nn->tlv_caps.me_freq_mhz / 16;
if (nfp_net_coalesce_para_check(factor * moder.usec, moder.pkts))
return;
/* copy TX interrupt coalesce parameters */
value = (moder.pkts << 16) | (factor * moder.usec);
nn_writel(nn, NFP_NET_CFG_TXR_IRQ_MOD(r_vec->tx_ring->idx), value);
(void)nfp_net_reconfig(nn, NFP_NET_CFG_UPDATE_IRQMOD);
dim->state = DIM_START_MEASURE;
}
/**
* 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)
{
struct nfp_net_r_vector *r_vec;
unsigned int r;
for (r = 0; r < nn->dp.num_r_vecs; r++) {
r_vec = &nn->r_vecs[r];
if (r_vec->rx_ring) {
INIT_WORK(&r_vec->rx_dim.work, nfp_net_rx_dim_work);
r_vec->rx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
}
if (r_vec->tx_ring) {
INIT_WORK(&r_vec->tx_dim.work, nfp_net_tx_dim_work);
r_vec->tx_dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
}
napi_enable(&r_vec->napi);
enable_irq(r_vec->irq_vector);
}
netif_tx_wake_all_queues(nn->dp.netdev);
enable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
nfp_net_read_link_status(nn);
}
static int nfp_net_open_alloc_all(struct nfp_net *nn)
{
int err, r;
err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_EXN, "%s-exn",
nn->exn_name, sizeof(nn->exn_name),
NFP_NET_IRQ_EXN_IDX, nn->exn_handler);
if (err)
return err;
err = nfp_net_aux_irq_request(nn, NFP_NET_CFG_LSC, "%s-lsc",
nn->lsc_name, sizeof(nn->lsc_name),
NFP_NET_IRQ_LSC_IDX, nn->lsc_handler);
if (err)
goto err_free_exn;
disable_irq(nn->irq_entries[NFP_NET_IRQ_LSC_IDX].vector);
for (r = 0; r < nn->dp.num_r_vecs; r++) {
err = nfp_net_prepare_vector(nn, &nn->r_vecs[r], r);
if (err)
goto err_cleanup_vec_p;
}
err = nfp_net_rx_rings_prepare(nn, &nn->dp);
if (err)
goto err_cleanup_vec;
err = nfp_net_tx_rings_prepare(nn, &nn->dp);
if (err)
goto err_free_rx_rings;
for (r =