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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2015-2019 Netronome Systems, Inc. */
#include <linux/seq_file.h>
#include "../nfp_net.h"
#include "../nfp_net_dp.h"
#include "../nfp_net_xsk.h"
#include "nfd3.h"
static void nfp_nfd3_xsk_tx_bufs_free(struct nfp_net_tx_ring *tx_ring)
{
struct nfp_nfd3_tx_buf *txbuf;
unsigned int idx;
while (tx_ring->rd_p != tx_ring->wr_p) {
idx = D_IDX(tx_ring, tx_ring->rd_p);
txbuf = &tx_ring->txbufs[idx];
txbuf->real_len = 0;
tx_ring->qcp_rd_p++;
tx_ring->rd_p++;
if (tx_ring->r_vec->xsk_pool) {
if (txbuf->is_xsk_tx)
nfp_nfd3_xsk_tx_free(txbuf);
xsk_tx_completed(tx_ring->r_vec->xsk_pool, 1);
}
}
}
/**
* nfp_nfd3_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_nfd3_tx_ring_reset(struct nfp_net_dp *dp, struct nfp_net_tx_ring *tx_ring)
{
struct netdev_queue *nd_q;
const skb_frag_t *frag;
while (!tx_ring->is_xdp && tx_ring->rd_p != tx_ring->wr_p) {
struct nfp_nfd3_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++;
}
if (tx_ring->is_xdp)
nfp_nfd3_xsk_tx_bufs_free(tx_ring);
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);
}
/**
* nfp_nfd3_tx_ring_free() - Free resources allocated to a TX ring
* @tx_ring: TX ring to free
*/
static void nfp_nfd3_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_nfd3_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_nfd3_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_nfd3_tx_ring_free(tx_ring);
return -ENOMEM;
}
static void
nfp_nfd3_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_nfd3_tx_ring_bufs_alloc(struct nfp_net_dp *dp,
struct nfp_net_tx_ring *tx_ring)
{
struct nfp_nfd3_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_nfd3_tx_ring_bufs_free(dp, tx_ring);
return -ENOMEM;
}
}
return 0;
}
static void
nfp_nfd3_print_tx_descs(struct seq_file *file,
struct nfp_net_r_vector *r_vec,
struct nfp_net_tx_ring *tx_ring,
u32 d_rd_p, u32 d_wr_p)
{
struct nfp_nfd3_tx_desc *txd;
u32 txd_cnt = tx_ring->cnt;
int i;
for (i = 0; i < txd_cnt; i++) {
struct xdp_buff *xdp;
struct sk_buff *skb;
txd = &tx_ring->txds[i];
seq_printf(file, "%04d: 0x%08x 0x%08x 0x%08x 0x%08x", i,
txd->vals[0], txd->vals[1],
txd->vals[2], txd->vals[3]);
if (!tx_ring->is_xdp) {
skb = READ_ONCE(tx_ring->txbufs[i].skb);
if (skb)
seq_printf(file, " skb->head=%p skb->data=%p",
skb->head, skb->data);
} else {
xdp = READ_ONCE(tx_ring->txbufs[i].xdp);
if (xdp)
seq_printf(file, " xdp->data=%p", xdp->data);
}
if (tx_ring->txbufs[i].dma_addr)
seq_printf(file, " dma_addr=%pad",
&tx_ring->txbufs[i].dma_addr);
if (i == tx_ring->rd_p % txd_cnt)
seq_puts(file, " H_RD");
if (i == tx_ring->wr_p % txd_cnt)
seq_puts(file, " H_WR");
if (i == d_rd_p % txd_cnt)
seq_puts(file, " D_RD");
if (i == d_wr_p % txd_cnt)
seq_puts(file, " D_WR");
seq_putc(file, '\n');
}
}
const struct nfp_dp_ops nfp_nfd3_ops = {
.version = NFP_NFD_VER_NFD3,
.poll = nfp_nfd3_poll,
.xsk_poll = nfp_nfd3_xsk_poll,
.ctrl_poll = nfp_nfd3_ctrl_poll,
.xmit = nfp_nfd3_tx,
.ctrl_tx_one = nfp_nfd3_ctrl_tx_one,
.rx_ring_fill_freelist = nfp_nfd3_rx_ring_fill_freelist,
.tx_ring_alloc = nfp_nfd3_tx_ring_alloc,
.tx_ring_reset = nfp_nfd3_tx_ring_reset,
.tx_ring_free = nfp_nfd3_tx_ring_free,
.tx_ring_bufs_alloc = nfp_nfd3_tx_ring_bufs_alloc,
.tx_ring_bufs_free = nfp_nfd3_tx_ring_bufs_free,
.print_tx_descs = nfp_nfd3_print_tx_descs
};
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