// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc */
/* Copyright (C) 2021 Corigine, Inc */
#include <linux/bpf_trace.h>
#include <linux/netdevice.h>
#include "../nfp_app.h"
#include "../nfp_net.h"
#include "../nfp_net_dp.h"
#include "../nfp_net_xsk.h"
#include "nfd3.h"
static bool
nfp_nfd3_xsk_tx_xdp(const struct nfp_net_dp *dp, struct nfp_net_r_vector *r_vec,
struct nfp_net_rx_ring *rx_ring,
struct nfp_net_tx_ring *tx_ring,
struct nfp_net_xsk_rx_buf *xrxbuf, unsigned int pkt_len,
int pkt_off)
{
struct xsk_buff_pool *pool = r_vec->xsk_pool;
struct nfp_nfd3_tx_buf *txbuf;
struct nfp_nfd3_tx_desc *txd;
unsigned int wr_idx;
if (nfp_net_tx_space(tx_ring) < 1)
return false;
xsk_buff_raw_dma_sync_for_device(pool, xrxbuf->dma_addr + pkt_off,
pkt_len);
wr_idx = D_IDX(tx_ring, tx_ring->wr_p);
txbuf = &tx_ring->txbufs[wr_idx];
txbuf->xdp = xrxbuf->xdp;
txbuf->real_len = pkt_len;
txbuf->is_xsk_tx = true;
/* Build TX descriptor */
txd = &tx_ring->txds[wr_idx];
txd->offset_eop = NFD3_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(pkt_len);
nfp_desc_set_dma_addr_40b(txd, xrxbuf->dma_addr + pkt_off);
txd->data_len = cpu_to_le16(pkt_len);
txd->flags = 0;
txd->mss = 0;
txd->lso_hdrlen = 0;
tx_ring->wr_ptr_add++;
tx_ring->wr_p++;
return true;
}
static void nfp_nfd3_xsk_rx_skb(struct nfp_net_rx_ring *rx_ring,
const struct nfp_net_rx_desc *rxd,
struct nfp_net_xsk_rx_buf *xrxbuf,
const struct nfp_meta_parsed *meta,
unsigned int pkt_len,
bool meta_xdp,
unsigned int *skbs_polled)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct nfp_net_dp *dp = &r_vec->nfp_net->dp;
struct net_device *netdev;
struct sk_buff *skb;
if (likely(!meta->portid)) {
netdev = dp->netdev;
} else {
struct nfp_net *nn = netdev_priv(dp->netdev);
netdev = nfp_app_dev_get(nn->app, meta->portid, NULL);
if (unlikely(!netdev)) {
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
return;
}
nfp_repr_inc_rx_stats(netdev, pkt_len);
}
skb = napi_alloc_skb(&r_vec->napi, pkt_len);
if (!skb) {
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
return;
}
skb_put_data(skb, xrxbuf->xdp->data, 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_nfd3_rx_csum(dp, r_vec, rxd, meta, skb);
if (unlikely(!nfp_net_vlan_strip(skb, rxd, meta))) {
dev_kfree_skb_any(skb);
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
return;
}
if (meta_xdp)
skb_metadata_set(skb,
xrxbuf->xdp->data - xrxbuf->xdp->data_meta);
napi_gro_receive(&rx_ring->r_vec->napi, skb);
nfp_net_xsk_rx_free(xrxbuf);
(*skbs_polled)++;
}
static unsigned int
nfp_nfd3_xsk_rx(struct nfp_net_rx_ring *rx_ring, int budget,
unsigned int *skbs_polled)
{
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_redir = false;
int pkts_polled = 0;
xdp_prog = READ_ONCE(dp->xdp_prog);
tx_ring = r_vec->xdp_ring;
while (pkts_polled < budget) {
unsigned int meta_len, data_len, pkt_len, pkt_off;
struct nfp_net_xsk_rx_buf *xrxbuf;
struct nfp_net_rx_desc *rxd;
struct nfp_meta_parsed meta;
int idx, act;
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;
rx_ring->rd_p++;
pkts_polled++;
xrxbuf = &rx_ring->xsk_rxbufs[idx];
/* If starved of buffers "drop" it and scream. */
if (rx_ring->rd_p >= rx_ring->wr_p) {
nn_dp_warn(dp, "Starved of RX buffers\n");
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
break;
}
/* Memory barrier to ensure that we won't do other reads
* before the DD bit.
*/
dma_rmb();
memset(&meta, 0, sizeof(meta));
/* Only supporting AF_XDP with dynamic metadata so buffer layout
* is always:
*
* ---------------------------------------------------------
* | off | metadata | packet | XXXX |
* ---------------------------------------------------------
*/
meta_len = rxd->rxd.meta_len_dd & PCIE_DESC_RX_META_LEN_MASK;
data_len = le16_to_cpu(rxd->rxd.data_len);
pkt_len = data_len - meta_len;
if (unlikely(meta_len > NFP_NET_MAX_PREPEND)) {
nn_dp_warn(dp, "Oversized RX packet metadata %u\n",
meta_len);
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
continue;
}
/* 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);
xrxbuf->xdp->data += meta_len;
xrxbuf->xdp->data_end = xrxbuf->xdp->data + pkt_len;
xdp_set_data_meta_invalid(xrxbuf->xdp);
xsk_buff_dma_sync_for_cpu(xrxbuf->xdp);
net_prefetch(xrxbuf->xdp->data);
if (meta_len) {
if (unlikely(nfp_nfd3_parse_meta(dp->netdev, &meta,
xrxbuf->xdp->data -
meta_len,
xrxbuf->xdp->data,
pkt_len, meta_len))) {
nn_dp_warn(dp, "Invalid RX packet metadata\n");
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
continue;
}
if (unlikely(meta.portid)) {
struct nfp_net *nn = netdev_priv(dp->netdev);
if (meta.portid != NFP_META_PORT_ID_CTRL) {
nfp_nfd3_xsk_rx_skb(rx_ring, rxd,
xrxbuf, &meta,
pkt_len, false,
skbs_polled);
continue;
}
nfp_app_ctrl_rx_raw(nn->app, xrxbuf->xdp->data,
pkt_len);
nfp_net_xsk_rx_free(xrxbuf);
continue;
}
}
act = bpf_prog_run_xdp(xdp_prog, xrxbuf->xdp);
pkt_len = xrxbuf->xdp->data_end - xrxbuf->xdp->data;
pkt_off = xrxbuf->xdp->data - xrxbuf->xdp->data_hard_start;
switch (act) {
case XDP_PASS:
nfp_nfd3_xsk_rx_skb(rx_ring, rxd, xrxbuf, &meta, pkt_len,
true, skbs_polled);
break;
case XDP_TX:
if (!nfp_nfd3_xsk_tx_xdp(dp, r_vec, rx_ring, tx_ring,
xrxbuf, pkt_len, pkt_off))
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
else
nfp_net_xsk_rx_unstash(xrxbuf);
break;
case XDP_REDIRECT:
if (xdp_do_redirect(dp->netdev, xrxbuf->xdp, xdp_prog)) {
nfp_net_xsk_rx_drop(r_vec, xrxbuf);
} else {
nfp_net_xsk_rx_unstash(xrxbuf);
xdp_redir = true;
}
break;
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_net_xsk_rx_drop(r_vec, xrxbuf);
break;
}
}
nfp_net_xsk_rx_ring_fill_freelist(r_vec->rx_ring);
if (xdp_redir)
xdp_do_flush();
if (tx_ring->wr_ptr_add)
nfp_net_tx_xmit_more_flush(tx_ring);
return pkts_polled;
}
void nfp_nfd3_xsk_tx_free(struct nfp_nfd3_tx_buf *txbuf)
{
xsk_buff_free(txbuf->xdp);
txbuf->dma_addr = 0;
txbuf->xdp = NULL;
}
static bool nfp_nfd3_xsk_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, reused = 0;
bool done_all;
int idx, todo;
u32 qcp_rd_p;
if (tx_ring->wr_p == tx_ring->rd_p)
return true;
/* 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--) {
struct nfp_nfd3_tx_buf *txbuf;
idx = D_IDX(tx_ring, tx_ring->rd_p);
tx_ring->rd_p++;
txbuf = &tx_ring->txbufs[idx];
if (unlikely(!txbuf->real_len))
continue;
done_bytes += txbuf->real_len;
txbuf->real_len = 0;
if (txbuf->is_xsk_tx) {
nfp_nfd3_xsk_tx_free(txbuf);
reused++;
}
}
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);
xsk_tx_completed(r_vec->xsk_pool, done_pkts - reused);
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 void nfp_nfd3_xsk_tx(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_net_r_vector *r_vec = tx_ring->r_vec;
struct xdp_desc desc[NFP_NET_XSK_TX_BATCH];
struct xsk_buff_pool *xsk_pool;
struct nfp_nfd3_tx_desc *txd;
u32 pkts = 0, wr_idx;
u32 i, got;
xsk_pool = r_vec->xsk_pool;
while (nfp_net_tx_space(tx_ring) >= NFP_NET_XSK_TX_BATCH) {
for (i = 0; i < NFP_NET_XSK_TX_BATCH; i++)
if (!xsk_tx_peek_desc(xsk_pool, &desc[i]))
break;
got = i;
if (!got)
break;
wr_idx = D_IDX(tx_ring, tx_ring->wr_p + i);
prefetchw(&tx_ring->txds[wr_idx]);
for (i = 0; i < got; i++)
xsk_buff_raw_dma_sync_for_device(xsk_pool, desc[i].addr,
desc[i].len);
for (i = 0; i < got; i++) {
wr_idx = D_IDX(tx_ring, tx_ring->wr_p + i);
tx_ring->txbufs[wr_idx].real_len = desc[i].len;
tx_ring->txbufs[wr_idx].is_xsk_tx = false;
/* Build TX descriptor. */
txd = &tx_ring->txds[wr_idx];
nfp_desc_set_dma_addr_40b(txd,
xsk_buff_raw_get_dma(xsk_pool, desc[i].addr));
txd->offset_eop = NFD3_DESC_TX_EOP;
txd->dma_len = cpu_to_le16(desc[i].len);
txd->data_len = cpu_to_le16(desc[i].len);
}
tx_ring->wr_p += got;
pkts += got;
}
if (!pkts)
return;
xsk_tx_release(xsk_pool);
/* Ensure all records are visible before incrementing write counter. */
wmb();
nfp_qcp_wr_ptr_add(tx_ring->qcp_q, pkts);
}
int nfp_nfd3_xsk_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, skbs = 0;
pkts_polled = nfp_nfd3_xsk_rx(r_vec->rx_ring, budget, &skbs);
if (pkts_polled < budget) {
if (r_vec->tx_ring)
nfp_nfd3_tx_complete(r_vec->tx_ring, budget);
if (!nfp_nfd3_xsk_complete(r_vec->xdp_ring))
pkts_polled = budget;
nfp_nfd3_xsk_tx(r_vec->xdp_ring);
if (pkts_polled < budget && napi_complete_done(napi, skbs))
nfp_net_irq_unmask(r_vec->nfp_net, r_vec->irq_entry);
}
return pkts_polled;
}
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