// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2018 Netronome Systems, Inc */
/* Copyright (C) 2021 Corigine, Inc */
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <net/xdp_sock_drv.h>
#include <trace/events/xdp.h>
#include "nfp_app.h"
#include "nfp_net.h"
#include "nfp_net_dp.h"
#include "nfp_net_xsk.h"
static void
nfp_net_xsk_rx_bufs_stash(struct nfp_net_rx_ring *rx_ring, unsigned int idx,
struct xdp_buff *xdp)
{
unsigned int headroom;
headroom = xsk_pool_get_headroom(rx_ring->r_vec->xsk_pool);
rx_ring->rxds[idx].fld.reserved = 0;
rx_ring->rxds[idx].fld.meta_len_dd = 0;
rx_ring->xsk_rxbufs[idx].xdp = xdp;
rx_ring->xsk_rxbufs[idx].dma_addr =
xsk_buff_xdp_get_frame_dma(xdp) + headroom;
}
void nfp_net_xsk_rx_unstash(struct nfp_net_xsk_rx_buf *rxbuf)
{
rxbuf->dma_addr = 0;
rxbuf->xdp = NULL;
}
void nfp_net_xsk_rx_free(struct nfp_net_xsk_rx_buf *rxbuf)
{
if (rxbuf->xdp)
xsk_buff_free(rxbuf->xdp);
nfp_net_xsk_rx_unstash(rxbuf);
}
void nfp_net_xsk_rx_bufs_free(struct nfp_net_rx_ring *rx_ring)
{
unsigned int i;
if (!rx_ring->cnt)
return;
for (i = 0; i < rx_ring->cnt - 1; i++)
nfp_net_xsk_rx_free(&rx_ring->xsk_rxbufs[i]);
}
void nfp_net_xsk_rx_ring_fill_freelist(struct nfp_net_rx_ring *rx_ring)
{
struct nfp_net_r_vector *r_vec = rx_ring->r_vec;
struct xsk_buff_pool *pool = r_vec->xsk_pool;
unsigned int wr_idx, wr_ptr_add = 0;
struct xdp_buff *xdp;
while (nfp_net_rx_space(rx_ring)) {
wr_idx = D_IDX(rx_ring, rx_ring->wr_p);
xdp = xsk_buff_alloc(pool);
if (!xdp)
break;
nfp_net_xsk_rx_bufs_stash(rx_ring, wr_idx, xdp);
/* DMA address is expanded to 48-bit width in freelist for NFP3800,
* so the *_48b macro is used accordingly, it's also OK to fill
* a 40-bit address since the top 8 bits are get set to 0.
*/
nfp_desc_set_dma_addr_48b(&rx_ring->rxds[wr_idx].fld,
rx_ring->xsk_rxbufs[wr_idx].dma_addr);
rx_ring->wr_p++;
wr_ptr_add++;
}
/* Ensure all records are visible before incrementing write counter. */
wmb();
nfp_qcp_wr_ptr_add(rx_ring->qcp_fl, wr_ptr_add);
}
void nfp_net_xsk_rx_drop(struct nfp_net_r_vector *r_vec,
struct nfp_net_xsk_rx_buf *xrxbuf)
{
u64_stats_update_begin(&r_vec->rx_sync);
r_vec->rx_drops++;
u64_stats_update_end(&r_vec->rx_sync);
nfp_net_xsk_rx_free(xrxbuf);
}
static void nfp_net_xsk_pool_unmap(struct device *dev,
struct xsk_buff_pool *pool)
{
return xsk_pool_dma_unmap(pool, 0);
}
static int nfp_net_xsk_pool_map(struct device *dev, struct xsk_buff_pool *pool)
{
return xsk_pool_dma_map(pool, dev, 0);
}
int nfp_net_xsk_setup_pool(struct net_device *netdev,
struct xsk_buff_pool *pool, u16 queue_id)
{
struct nfp_net *nn = netdev_priv(netdev);
struct xsk_buff_pool *prev_pool;
struct nfp_net_dp *dp;
int err;
/* NFDK doesn't implement xsk yet. */
if (nn->dp.ops->version == NFP_NFD_VER_NFDK)
return -EOPNOTSUPP;
/* Reject on old FWs so we can drop some checks on datapath. */
if (nn->dp.rx_offset != NFP_NET_CFG_RX_OFFSET_DYNAMIC)
return -EOPNOTSUPP;
if (!nn->dp.chained_metadata_format)
return -EOPNOTSUPP;
/* Install */
if (pool) {
err = nfp_net_xsk_pool_map(nn->dp.dev, pool);
if (err)
return err;
}
/* Reconfig/swap */
dp = nfp_net_clone_dp(nn);
if (!dp) {
err = -ENOMEM;
goto err_unmap;
}
prev_pool = dp->xsk_pools[queue_id];
dp->xsk_pools[queue_id] = pool;
err = nfp_net_ring_reconfig(nn, dp, NULL);
if (err)
goto err_unmap;
/* Uninstall */
if (prev_pool)
nfp_net_xsk_pool_unmap(nn->dp.dev, prev_pool);
return 0;
err_unmap:
if (pool)
nfp_net_xsk_pool_unmap(nn->dp.dev, pool);
return err;
}
int nfp_net_xsk_wakeup(struct net_device *netdev, u32 queue_id, u32 flags)
{
struct nfp_net *nn = netdev_priv(netdev);
/* queue_id comes from a zero-copy socket, installed with XDP_SETUP_XSK_POOL,
* so it must be within our vector range. Moreover, our napi structs
* are statically allocated, so we can always kick them without worrying
* if reconfig is in progress or interface down.
*/
napi_schedule(&nn->r_vecs[queue_id].napi);
return 0;
}
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