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linuxdebug/drivers/net/ethernet/netronome/nfp/nfdk/dp.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2015-2019 Netronome Systems, Inc. */
#include <linux/bpf_trace.h>
#include <linux/netdevice.h>
#include <linux/overflow.h>
#include <linux/sizes.h>
#include <linux/bitfield.h>
#include "../nfp_app.h"
#include "../nfp_net.h"
#include "../nfp_net_dp.h"
#include "../crypto/crypto.h"
#include "../crypto/fw.h"
#include "nfdk.h"
static int nfp_nfdk_tx_ring_should_wake(struct nfp_net_tx_ring *tx_ring)
{
return !nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT * 2);
}
static int nfp_nfdk_tx_ring_should_stop(struct nfp_net_tx_ring *tx_ring)
{
return nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT);
}
static void nfp_nfdk_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_nfdk_tx_ring_should_wake(tx_ring)))
netif_tx_start_queue(nd_q);
}
static __le64
nfp_nfdk_tx_tso(struct nfp_net_r_vector *r_vec, struct nfp_nfdk_tx_buf *txbuf,
struct sk_buff *skb)
{
u32 segs, hdrlen, l3_offset, l4_offset;
struct nfp_nfdk_tx_desc txd;
u16 mss;
if (!skb->encapsulation) {
l3_offset = skb_network_offset(skb);
l4_offset = skb_transport_offset(skb);
hdrlen = skb_tcp_all_headers(skb);
} else {
l3_offset = skb_inner_network_offset(skb);
l4_offset = skb_inner_transport_offset(skb);
hdrlen = skb_inner_tcp_all_headers(skb);
}
segs = skb_shinfo(skb)->gso_segs;
mss = skb_shinfo(skb)->gso_size & NFDK_DESC_TX_MSS_MASK;
txd.l3_offset = l3_offset;
txd.l4_offset = l4_offset;
txd.lso_meta_res = 0;
txd.mss = cpu_to_le16(mss);
txd.lso_hdrlen = hdrlen;
txd.lso_totsegs = segs;
txbuf->pkt_cnt = segs;
txbuf->real_len = skb->len + hdrlen * (txbuf->pkt_cnt - 1);
u64_stats_update_begin(&r_vec->tx_sync);
r_vec->tx_lso++;
u64_stats_update_end(&r_vec->tx_sync);
return txd.raw;
}
static u8
nfp_nfdk_tx_csum(struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
unsigned int pkt_cnt, struct sk_buff *skb, u64 flags)
{
struct ipv6hdr *ipv6h;
struct iphdr *iph;
if (!(dp->ctrl & NFP_NET_CFG_CTRL_TXCSUM))
return flags;
if (skb->ip_summed != CHECKSUM_PARTIAL)
return flags;
flags |= NFDK_DESC_TX_L4_CSUM;
iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb);
ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
/* L3 checksum offloading flag is not required for ipv6 */
if (iph->version == 4) {
flags |= NFDK_DESC_TX_L3_CSUM;
} else if (ipv6h->version != 6) {
nn_dp_warn(dp, "partial checksum but ipv=%x!\n", iph->version);
return flags;
}
u64_stats_update_begin(&r_vec->tx_sync);
if (!skb->encapsulation) {
r_vec->hw_csum_tx += pkt_cnt;
} else {
flags |= NFDK_DESC_TX_ENCAP;
r_vec->hw_csum_tx_inner += pkt_cnt;
}
u64_stats_update_end(&r_vec->tx_sync);
return flags;
}
static int
nfp_nfdk_tx_maybe_close_block(struct nfp_net_tx_ring *tx_ring,
struct sk_buff *skb)
{
unsigned int n_descs, wr_p, nop_slots;
const skb_frag_t *frag, *fend;
struct nfp_nfdk_tx_desc *txd;
unsigned int nr_frags;
unsigned int wr_idx;
int err;
recount_descs:
n_descs = nfp_nfdk_headlen_to_segs(skb_headlen(skb));
nr_frags = skb_shinfo(skb)->nr_frags;
frag = skb_shinfo(skb)->frags;
fend = frag + nr_frags;
for (; frag < fend; frag++)
n_descs += DIV_ROUND_UP(skb_frag_size(frag),
NFDK_TX_MAX_DATA_PER_DESC);
if (unlikely(n_descs > NFDK_TX_DESC_GATHER_MAX)) {
if (skb_is_nonlinear(skb)) {
err = skb_linearize(skb);
if (err)
return err;
goto recount_descs;
}
return -EINVAL;
}
/* Under count by 1 (don't count meta) for the round down to work out */
n_descs += !!skb_is_gso(skb);
if (round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT))
goto close_block;
if ((u32)tx_ring->data_pending + skb->len > NFDK_TX_MAX_DATA_PER_BLOCK)
goto close_block;
return 0;
close_block:
wr_p = tx_ring->wr_p;
nop_slots = D_BLOCK_CPL(wr_p);
wr_idx = D_IDX(tx_ring, wr_p);
tx_ring->ktxbufs[wr_idx].skb = NULL;
txd = &tx_ring->ktxds[wr_idx];
memset(txd, 0, array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
tx_ring->data_pending = 0;
tx_ring->wr_p += nop_slots;
tx_ring->wr_ptr_add += nop_slots;
return 0;
}
static int
nfp_nfdk_prep_tx_meta(struct nfp_net_dp *dp, struct nfp_app *app,
struct sk_buff *skb)
{
struct metadata_dst *md_dst = skb_metadata_dst(skb);
unsigned char *data;
bool vlan_insert;
u32 meta_id = 0;
int md_bytes;
if (unlikely(md_dst && md_dst->type != METADATA_HW_PORT_MUX))
md_dst = NULL;
vlan_insert = skb_vlan_tag_present(skb) && (dp->ctrl & NFP_NET_CFG_CTRL_TXVLAN_V2);
if (!(md_dst || vlan_insert))
return 0;
md_bytes = sizeof(meta_id) +
!!md_dst * NFP_NET_META_PORTID_SIZE +
vlan_insert * NFP_NET_META_VLAN_SIZE;
if (unlikely(skb_cow_head(skb, md_bytes)))
return -ENOMEM;
data = skb_push(skb, md_bytes) + md_bytes;
if (md_dst) {
data -= NFP_NET_META_PORTID_SIZE;
put_unaligned_be32(md_dst->u.port_info.port_id, data);
meta_id = NFP_NET_META_PORTID;
}
if (vlan_insert) {
data -= NFP_NET_META_VLAN_SIZE;
/* data type of skb->vlan_proto is __be16
* so it fills metadata without calling put_unaligned_be16
*/
memcpy(data, &skb->vlan_proto, sizeof(skb->vlan_proto));
put_unaligned_be16(skb_vlan_tag_get(skb), data + sizeof(skb->vlan_proto));
meta_id <<= NFP_NET_META_FIELD_SIZE;
meta_id |= NFP_NET_META_VLAN;
}
meta_id = FIELD_PREP(NFDK_META_LEN, md_bytes) |
FIELD_PREP(NFDK_META_FIELDS, meta_id);
data -= sizeof(meta_id);
put_unaligned_be32(meta_id, data);
return NFDK_DESC_TX_CHAIN_META;
}
/**
* nfp_nfdk_tx() - Main transmit entry point
* @skb: SKB to transmit
* @netdev: netdev structure
*
* Return: NETDEV_TX_OK on success.
*/
netdev_tx_t nfp_nfdk_tx(struct sk_buff *skb, struct net_device *netdev)
{
struct nfp_net *nn = netdev_priv(netdev);
struct nfp_nfdk_tx_buf *txbuf, *etxbuf;
u32 cnt, tmp_dlen, dlen_type = 0;
struct nfp_net_tx_ring *tx_ring;
struct nfp_net_r_vector *r_vec;
const skb_frag_t *frag, *fend;
struct nfp_nfdk_tx_desc *txd;
unsigned int real_len, qidx;
unsigned int dma_len, type;
struct netdev_queue *nd_q;
struct nfp_net_dp *dp;
int nr_frags, wr_idx;
dma_addr_t dma_addr;
u64 metadata;
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);
/* Don't bother counting frags, assume the worst */
if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
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;
}
metadata = nfp_nfdk_prep_tx_meta(dp, nn->app, skb);
if (unlikely((int)metadata < 0))
goto err_flush;
if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
goto err_flush;
/* nr_frags will change after skb_linearize so we get nr_frags after
* nfp_nfdk_tx_maybe_close_block function
*/
nr_frags = skb_shinfo(skb)->nr_frags;
/* DMA map all */
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
txd = &tx_ring->ktxds[wr_idx];
txbuf = &tx_ring->ktxbufs[wr_idx];
dma_len = skb_headlen(skb);
if (skb_is_gso(skb))
type = NFDK_DESC_TX_TYPE_TSO;
else if (!nr_frags && dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;
dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_warn_dma;
txbuf->skb = skb;
txbuf++;
txbuf->dma_addr = dma_addr;
txbuf++;
/* FIELD_PREP() implicitly truncates to chunk */
dma_len -= 1;
/* We will do our best to pass as much data as we can in descriptor
* and we need to make sure the first descriptor includes whole head
* since there is limitation in firmware side. Sometimes the value of
* dma_len bitwise and NFDK_DESC_TX_DMA_LEN_HEAD will less than
* headlen.
*/
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
/* starts at bit 0 */
BUILD_BUG_ON(!(NFDK_DESC_TX_DMA_LEN_HEAD & 1));
/* Preserve the original dlen_type, this way below the EOP logic
* can use dlen_type.
*/
tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
dma_len -= tmp_dlen;
dma_addr += tmp_dlen + 1;
txd++;
/* The rest of the data (if any) will be in larger dma descritors
* and is handled with the fragment loop.
*/
frag = skb_shinfo(skb)->frags;
fend = frag + nr_frags;
while (true) {
while (dma_len > 0) {
dma_len -= 1;
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
dma_len -= dlen_type;
dma_addr += dlen_type + 1;
txd++;
}
if (frag >= fend)
break;
dma_len = skb_frag_size(frag);
dma_addr = skb_frag_dma_map(dp->dev, frag, 0, dma_len,
DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_unmap;
txbuf->dma_addr = dma_addr;
txbuf++;
frag++;
}
(txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
if (!skb_is_gso(skb)) {
real_len = skb->len;
/* Metadata desc */
metadata = nfp_nfdk_tx_csum(dp, r_vec, 1, skb, metadata);
txd->raw = cpu_to_le64(metadata);
txd++;
} else {
/* lso desc should be placed after metadata desc */
(txd + 1)->raw = nfp_nfdk_tx_tso(r_vec, txbuf, skb);
real_len = txbuf->real_len;
/* Metadata desc */
metadata = nfp_nfdk_tx_csum(dp, r_vec, txbuf->pkt_cnt, skb, metadata);
txd->raw = cpu_to_le64(metadata);
txd += 2;
txbuf++;
}
cnt = txd - tx_ring->ktxds - wr_idx;
if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
goto err_warn_overflow;
skb_tx_timestamp(skb);
tx_ring->wr_p += cnt;
if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
tx_ring->data_pending += skb->len;
else
tx_ring->data_pending = 0;
if (nfp_nfdk_tx_ring_should_stop(tx_ring))
nfp_nfdk_tx_ring_stop(nd_q, tx_ring);
tx_ring->wr_ptr_add += cnt;
if (__netdev_tx_sent_queue(nd_q, real_len, netdev_xmit_more()))
nfp_net_tx_xmit_more_flush(tx_ring);
return NETDEV_TX_OK;
err_warn_overflow:
WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
wr_idx, skb_headlen(skb), nr_frags, cnt);
if (skb_is_gso(skb))
txbuf--;
err_unmap:
/* txbuf pointed to the next-to-use */
etxbuf = txbuf;
/* first txbuf holds the skb */
txbuf = &tx_ring->ktxbufs[wr_idx + 1];
if (txbuf < etxbuf) {
dma_unmap_single(dp->dev, txbuf->dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
txbuf->raw = 0;
txbuf++;
}
frag = skb_shinfo(skb)->frags;
while (etxbuf < txbuf) {
dma_unmap_page(dp->dev, txbuf->dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
txbuf->raw = 0;
frag++;
txbuf++;
}
err_warn_dma:
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);
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
/**
* nfp_nfdk_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_nfdk_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;
u32 done_pkts = 0, done_bytes = 0;
struct nfp_nfdk_tx_buf *ktxbufs;
struct device *dev = dp->dev;
struct netdev_queue *nd_q;
u32 rd_p, qcp_rd_p;
int todo;
rd_p = tx_ring->rd_p;
if (tx_ring->wr_p == rd_p)
return;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
if (qcp_rd_p == tx_ring->qcp_rd_p)
return;
todo = D_IDX(tx_ring, qcp_rd_p - tx_ring->qcp_rd_p);
ktxbufs = tx_ring->ktxbufs;
while (todo > 0) {
const skb_frag_t *frag, *fend;
unsigned int size, n_descs = 1;
struct nfp_nfdk_tx_buf *txbuf;
struct sk_buff *skb;
txbuf = &ktxbufs[D_IDX(tx_ring, rd_p)];
skb = txbuf->skb;
txbuf++;
/* Closed block */
if (!skb) {
n_descs = D_BLOCK_CPL(rd_p);
goto next;
}
/* Unmap head */
size = skb_headlen(skb);
n_descs += nfp_nfdk_headlen_to_segs(size);
dma_unmap_single(dev, txbuf->dma_addr, size, DMA_TO_DEVICE);
txbuf++;
/* Unmap frags */
frag = skb_shinfo(skb)->frags;
fend = frag + skb_shinfo(skb)->nr_frags;
for (; frag < fend; frag++) {
size = skb_frag_size(frag);
n_descs += DIV_ROUND_UP(size,
NFDK_TX_MAX_DATA_PER_DESC);
dma_unmap_page(dev, txbuf->dma_addr,
skb_frag_size(frag), DMA_TO_DEVICE);
txbuf++;
}
if (!skb_is_gso(skb)) {
done_bytes += skb->len;
done_pkts++;
} else {
done_bytes += txbuf->real_len;
done_pkts += txbuf->pkt_cnt;
n_descs++;
}
napi_consume_skb(skb, budget);
next:
rd_p += n_descs;
todo -= n_descs;
}
tx_ring->rd_p = rd_p;
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_nfdk_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);
}
/* Receive processing */
static void *
nfp_nfdk_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_nfdk_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_nfdk_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_48b(&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_nfdk_rx_ring_fill_freelist() - Give buffers from the ring to FW
* @dp: NFP Net data path struct
* @rx_ring: RX ring to fill
*/
void nfp_nfdk_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_nfdk_rx_give_one(dp, rx_ring, rx_ring->rxbufs[i].frag,
rx_ring->rxbufs[i].dma_addr);
}
/**
* nfp_nfdk_rx_csum_has_errors() - group check if rxd has any csum errors
* @flags: RX descriptor flags field in CPU byte order
*/
static int nfp_nfdk_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_nfdk_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_nfdk_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_nfdk_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_nfdk_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 bool
nfp_nfdk_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, vlan_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_nfdk_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_VLAN:
vlan_info = get_unaligned_be32(data);
if (FIELD_GET(NFP_NET_META_VLAN_STRIP, vlan_info)) {
meta->vlan.stripped = true;
meta->vlan.tpid = FIELD_GET(NFP_NET_META_VLAN_TPID_MASK,
vlan_info);
meta->vlan.tci = FIELD_GET(NFP_NET_META_VLAN_TCI_MASK,
vlan_info);
}
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_nfdk_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_nfdk_rx_give_one(dp, rx_ring, rxbuf->frag, rxbuf->dma_addr);
if (skb)
dev_kfree_skb_any(skb);
}
static bool nfp_nfdk_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;
struct nfp_net_rx_ring *rx_ring;
u32 qcp_rd_p, done = 0;
bool done_all;
int todo;
/* Work out how many descriptors have been transmitted */
qcp_rd_p = nfp_net_read_tx_cmpl(tx_ring, dp);
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);
rx_ring = r_vec->rx_ring;
while (todo > 0) {
int idx = D_IDX(tx_ring, tx_ring->rd_p + done);
struct nfp_nfdk_tx_buf *txbuf;
unsigned int step = 1;
txbuf = &tx_ring->ktxbufs[idx];
if (!txbuf->raw)
goto next;
if (NFDK_TX_BUF_INFO(txbuf->val) != NFDK_TX_BUF_INFO_SOP) {
WARN_ONCE(1, "Unexpected TX buffer in XDP TX ring\n");
goto next;
}
/* Two successive txbufs are used to stash virtual and dma
* address respectively, recycle and clean them here.
*/
nfp_nfdk_rx_give_one(dp, rx_ring,
(void *)NFDK_TX_BUF_PTR(txbuf[0].val),
txbuf[1].dma_addr);
txbuf[0].raw = 0;
txbuf[1].raw = 0;
step = 2;
u64_stats_update_begin(&r_vec->tx_sync);
/* Note: tx_bytes not accumulated. */
r_vec->tx_pkts++;
u64_stats_update_end(&r_vec->tx_sync);
next:
todo -= step;
done += step;
}
tx_ring->qcp_rd_p = D_IDX(tx_ring, tx_ring->qcp_rd_p + done);
tx_ring->rd_p += done;
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;
}
static bool
nfp_nfdk_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;
unsigned int dma_len, type, cnt, dlen_type, tmp_dlen;
struct nfp_nfdk_tx_buf *txbuf;
struct nfp_nfdk_tx_desc *txd;
unsigned int n_descs;
dma_addr_t dma_addr;
int wr_idx;
/* Reject if xdp_adjust_tail grow packet beyond DMA area */
if (pkt_len + dma_off > dma_map_sz)
return false;
/* Make sure there's still at least one block available after
* aligning to block boundary, so that the txds used below
* won't wrap around the tx_ring.
*/
if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
if (!*completed) {
nfp_nfdk_xdp_complete(tx_ring);
*completed = true;
}
if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
nfp_nfdk_rx_drop(dp, rx_ring->r_vec, rx_ring, rxbuf,
NULL);
return false;
}
}
/* Check if cross block boundary */
n_descs = nfp_nfdk_headlen_to_segs(pkt_len);
if ((round_down(tx_ring->wr_p, NFDK_TX_DESC_BLOCK_CNT) !=
round_down(tx_ring->wr_p + n_descs, NFDK_TX_DESC_BLOCK_CNT)) ||
((u32)tx_ring->data_pending + pkt_len >
NFDK_TX_MAX_DATA_PER_BLOCK)) {
unsigned int nop_slots = D_BLOCK_CPL(tx_ring->wr_p);
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
txd = &tx_ring->ktxds[wr_idx];
memset(txd, 0,
array_size(nop_slots, sizeof(struct nfp_nfdk_tx_desc)));
tx_ring->data_pending = 0;
tx_ring->wr_p += nop_slots;
tx_ring->wr_ptr_add += nop_slots;
}
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
txbuf = &tx_ring->ktxbufs[wr_idx];
txbuf[0].val = (unsigned long)rxbuf->frag | NFDK_TX_BUF_INFO_SOP;
txbuf[1].dma_addr = rxbuf->dma_addr;
/* Note: pkt len not stored */
dma_sync_single_for_device(dp->dev, rxbuf->dma_addr + dma_off,
pkt_len, DMA_BIDIRECTIONAL);
/* Build TX descriptor */
txd = &tx_ring->ktxds[wr_idx];
dma_len = pkt_len;
dma_addr = rxbuf->dma_addr + dma_off;
if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;
/* FIELD_PREP() implicitly truncates to chunk */
dma_len -= 1;
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
dma_len -= tmp_dlen;
dma_addr += tmp_dlen + 1;
txd++;
while (dma_len > 0) {
dma_len -= 1;
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
dlen_type &= NFDK_DESC_TX_DMA_LEN;
dma_len -= dlen_type;
dma_addr += dlen_type + 1;
txd++;
}
(txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
/* Metadata desc */
txd->raw = 0;
txd++;
cnt = txd - tx_ring->ktxds - wr_idx;
tx_ring->wr_p += cnt;
if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
tx_ring->data_pending += pkt_len;
else
tx_ring->data_pending = 0;
tx_ring->wr_ptr_add += cnt;
return true;
}
/**
* nfp_nfdk_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_nfdk_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_nfdk_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 (meta_len) {
if (unlikely(nfp_nfdk_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_nfdk_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_nfdk_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(dp->netdev, xdp_prog, act);
fallthrough;
case XDP_ABORTED:
trace_xdp_exception(dp->netdev, xdp_prog, act);
fallthrough;
case XDP_DROP:
nfp_nfdk_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_nfdk_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_nfdk_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_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
continue;
}
new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
continue;
}
nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
nfp_nfdk_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_nfdk_rx_csum(dp, r_vec, rxd, &meta, skb);
if (unlikely(!nfp_net_vlan_strip(skb, rxd, &meta))) {
nfp_nfdk_rx_drop(dp, r_vec, rx_ring, NULL, skb);
continue;
}
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_nfdk_xdp_complete(tx_ring))
pkts_polled = budget;
}
return pkts_polled;
}
/**
* nfp_nfdk_poll() - napi poll function
* @napi: NAPI structure
* @budget: NAPI budget
*
* Return: number of packets polled.
*/
int nfp_nfdk_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_nfdk_tx_complete(r_vec->tx_ring, budget);
if (r_vec->rx_ring)
pkts_polled = nfp_nfdk_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
*/
bool
nfp_nfdk_ctrl_tx_one(struct nfp_net *nn, struct nfp_net_r_vector *r_vec,
struct sk_buff *skb, bool old)
{
u32 cnt, tmp_dlen, dlen_type = 0;
struct nfp_net_tx_ring *tx_ring;
struct nfp_nfdk_tx_buf *txbuf;
struct nfp_nfdk_tx_desc *txd;
unsigned int dma_len, type;
struct nfp_net_dp *dp;
dma_addr_t dma_addr;
u64 metadata = 0;
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;
}
/* Don't bother counting frags, assume the worst */
if (unlikely(nfp_net_tx_full(tx_ring, NFDK_TX_DESC_STOP_CNT))) {
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 NETDEV_TX_BUSY;
}
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;
}
metadata = NFDK_DESC_TX_CHAIN_META;
put_unaligned_be32(NFP_META_PORT_ID_CTRL, skb_push(skb, 4));
put_unaligned_be32(FIELD_PREP(NFDK_META_LEN, 8) |
FIELD_PREP(NFDK_META_FIELDS,
NFP_NET_META_PORTID),
skb_push(skb, 4));
}
if (nfp_nfdk_tx_maybe_close_block(tx_ring, skb))
goto err_free;
/* DMA map all */
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
txd = &tx_ring->ktxds[wr_idx];
txbuf = &tx_ring->ktxbufs[wr_idx];
dma_len = skb_headlen(skb);
if (dma_len <= NFDK_TX_MAX_DATA_PER_HEAD)
type = NFDK_DESC_TX_TYPE_SIMPLE;
else
type = NFDK_DESC_TX_TYPE_GATHER;
dma_addr = dma_map_single(dp->dev, skb->data, dma_len, DMA_TO_DEVICE);
if (dma_mapping_error(dp->dev, dma_addr))
goto err_warn_dma;
txbuf->skb = skb;
txbuf++;
txbuf->dma_addr = dma_addr;
txbuf++;
dma_len -= 1;
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN_HEAD,
dma_len > NFDK_DESC_TX_DMA_LEN_HEAD ?
NFDK_DESC_TX_DMA_LEN_HEAD : dma_len) |
FIELD_PREP(NFDK_DESC_TX_TYPE_HEAD, type);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
tmp_dlen = dlen_type & NFDK_DESC_TX_DMA_LEN_HEAD;
dma_len -= tmp_dlen;
dma_addr += tmp_dlen + 1;
txd++;
while (dma_len > 0) {
dma_len -= 1;
dlen_type = FIELD_PREP(NFDK_DESC_TX_DMA_LEN, dma_len);
txd->dma_len_type = cpu_to_le16(dlen_type);
nfp_desc_set_dma_addr_48b(txd, dma_addr);
dlen_type &= NFDK_DESC_TX_DMA_LEN;
dma_len -= dlen_type;
dma_addr += dlen_type + 1;
txd++;
}
(txd - 1)->dma_len_type = cpu_to_le16(dlen_type | NFDK_DESC_TX_EOP);
/* Metadata desc */
txd->raw = cpu_to_le64(metadata);
txd++;
cnt = txd - tx_ring->ktxds - wr_idx;
if (unlikely(round_down(wr_idx, NFDK_TX_DESC_BLOCK_CNT) !=
round_down(wr_idx + cnt - 1, NFDK_TX_DESC_BLOCK_CNT)))
goto err_warn_overflow;
tx_ring->wr_p += cnt;
if (tx_ring->wr_p % NFDK_TX_DESC_BLOCK_CNT)
tx_ring->data_pending += skb->len;
else
tx_ring->data_pending = 0;
tx_ring->wr_ptr_add += cnt;
nfp_net_tx_xmit_more_flush(tx_ring);
return NETDEV_TX_OK;
err_warn_overflow:
WARN_ONCE(1, "unable to fit packet into a descriptor wr_idx:%d head:%d frags:%d cnt:%d",
wr_idx, skb_headlen(skb), 0, cnt);
txbuf--;
dma_unmap_single(dp->dev, txbuf->dma_addr,
skb_headlen(skb), DMA_TO_DEVICE);
txbuf->raw = 0;
err_warn_dma:
nn_dp_warn(dp, "Failed to map DMA TX 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 NETDEV_TX_OK;
}
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_nfdk_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_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
return true;
}
skb = build_skb(rxbuf->frag, dp->fl_bufsz);
if (unlikely(!skb)) {
nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, NULL);
return true;
}
new_frag = nfp_nfdk_napi_alloc_one(dp, &new_dma_addr);
if (unlikely(!new_frag)) {
nfp_nfdk_rx_drop(dp, r_vec, rx_ring, rxbuf, skb);
return true;
}
nfp_net_dma_unmap_rx(dp, rxbuf->dma_addr);
nfp_nfdk_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;
}
void nfp_nfdk_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_nfdk_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");
}
}