diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c | 454 |
1 files changed, 454 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c new file mode 100644 index 000000000000..051748b997f3 --- /dev/null +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-xsk.c @@ -0,0 +1,454 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) +/* Copyright 2022 NXP + */ +#include <linux/filter.h> +#include <linux/compiler.h> +#include <linux/bpf_trace.h> +#include <net/xdp.h> +#include <net/xdp_sock_drv.h> + +#include "dpaa2-eth.h" + +static void dpaa2_eth_setup_consume_func(struct dpaa2_eth_priv *priv, + struct dpaa2_eth_channel *ch, + enum dpaa2_eth_fq_type type, + dpaa2_eth_consume_cb_t *consume) +{ + struct dpaa2_eth_fq *fq; + int i; + + for (i = 0; i < priv->num_fqs; i++) { + fq = &priv->fq[i]; + + if (fq->type != type) + continue; + if (fq->channel != ch) + continue; + + fq->consume = consume; + } +} + +static u32 dpaa2_xsk_run_xdp(struct dpaa2_eth_priv *priv, + struct dpaa2_eth_channel *ch, + struct dpaa2_eth_fq *rx_fq, + struct dpaa2_fd *fd, void *vaddr) +{ + dma_addr_t addr = dpaa2_fd_get_addr(fd); + struct bpf_prog *xdp_prog; + struct xdp_buff *xdp_buff; + struct dpaa2_eth_swa *swa; + u32 xdp_act = XDP_PASS; + int err; + + xdp_prog = READ_ONCE(ch->xdp.prog); + if (!xdp_prog) + goto out; + + swa = (struct dpaa2_eth_swa *)(vaddr + DPAA2_ETH_RX_HWA_SIZE + + ch->xsk_pool->umem->headroom); + xdp_buff = swa->xsk.xdp_buff; + + xdp_buff->data_hard_start = vaddr; + xdp_buff->data = vaddr + dpaa2_fd_get_offset(fd); + xdp_buff->data_end = xdp_buff->data + dpaa2_fd_get_len(fd); + xdp_set_data_meta_invalid(xdp_buff); + xdp_buff->rxq = &ch->xdp_rxq; + + xsk_buff_dma_sync_for_cpu(xdp_buff, ch->xsk_pool); + xdp_act = bpf_prog_run_xdp(xdp_prog, xdp_buff); + + /* xdp.data pointer may have changed */ + dpaa2_fd_set_offset(fd, xdp_buff->data - vaddr); + dpaa2_fd_set_len(fd, xdp_buff->data_end - xdp_buff->data); + + if (likely(xdp_act == XDP_REDIRECT)) { + err = xdp_do_redirect(priv->net_dev, xdp_buff, xdp_prog); + if (unlikely(err)) { + ch->stats.xdp_drop++; + dpaa2_eth_recycle_buf(priv, ch, addr); + } else { + ch->buf_count--; + ch->stats.xdp_redirect++; + } + + goto xdp_redir; + } + + switch (xdp_act) { + case XDP_PASS: + break; + case XDP_TX: + dpaa2_eth_xdp_enqueue(priv, ch, fd, vaddr, rx_fq->flowid); + break; + default: + bpf_warn_invalid_xdp_action(priv->net_dev, xdp_prog, xdp_act); + fallthrough; + case XDP_ABORTED: + trace_xdp_exception(priv->net_dev, xdp_prog, xdp_act); + fallthrough; + case XDP_DROP: + dpaa2_eth_recycle_buf(priv, ch, addr); + ch->stats.xdp_drop++; + break; + } + +xdp_redir: + ch->xdp.res |= xdp_act; +out: + return xdp_act; +} + +/* Rx frame processing routine for the AF_XDP fast path */ +static void dpaa2_xsk_rx(struct dpaa2_eth_priv *priv, + struct dpaa2_eth_channel *ch, + const struct dpaa2_fd *fd, + struct dpaa2_eth_fq *fq) +{ + dma_addr_t addr = dpaa2_fd_get_addr(fd); + u8 fd_format = dpaa2_fd_get_format(fd); + struct rtnl_link_stats64 *percpu_stats; + u32 fd_length = dpaa2_fd_get_len(fd); + struct sk_buff *skb; + void *vaddr; + u32 xdp_act; + + trace_dpaa2_rx_xsk_fd(priv->net_dev, fd); + + vaddr = dpaa2_iova_to_virt(priv->iommu_domain, addr); + percpu_stats = this_cpu_ptr(priv->percpu_stats); + + if (fd_format != dpaa2_fd_single) { + WARN_ON(priv->xdp_prog); + /* AF_XDP doesn't support any other formats */ + goto err_frame_format; + } + + xdp_act = dpaa2_xsk_run_xdp(priv, ch, fq, (struct dpaa2_fd *)fd, vaddr); + if (xdp_act != XDP_PASS) { + percpu_stats->rx_packets++; + percpu_stats->rx_bytes += dpaa2_fd_get_len(fd); + return; + } + + /* Build skb */ + skb = dpaa2_eth_alloc_skb(priv, ch, fd, fd_length, vaddr); + if (!skb) + /* Nothing else we can do, recycle the buffer and + * drop the frame. + */ + goto err_alloc_skb; + + /* Send the skb to the Linux networking stack */ + dpaa2_eth_receive_skb(priv, ch, fd, vaddr, fq, percpu_stats, skb); + + return; + +err_alloc_skb: + dpaa2_eth_recycle_buf(priv, ch, addr); +err_frame_format: + percpu_stats->rx_dropped++; +} + +static void dpaa2_xsk_set_bp_per_qdbin(struct dpaa2_eth_priv *priv, + struct dpni_pools_cfg *pools_params) +{ + int curr_bp = 0, i, j; + + pools_params->pool_options = DPNI_POOL_ASSOC_QDBIN; + for (i = 0; i < priv->num_bps; i++) { + for (j = 0; j < priv->num_channels; j++) + if (priv->bp[i] == priv->channel[j]->bp) + pools_params->pools[curr_bp].priority_mask |= (1 << j); + if (!pools_params->pools[curr_bp].priority_mask) + continue; + + pools_params->pools[curr_bp].dpbp_id = priv->bp[i]->bpid; + pools_params->pools[curr_bp].buffer_size = priv->rx_buf_size; + pools_params->pools[curr_bp++].backup_pool = 0; + } + pools_params->num_dpbp = curr_bp; +} + +static int dpaa2_xsk_disable_pool(struct net_device *dev, u16 qid) +{ + struct xsk_buff_pool *pool = xsk_get_pool_from_qid(dev, qid); + struct dpaa2_eth_priv *priv = netdev_priv(dev); + struct dpni_pools_cfg pools_params = { 0 }; + struct dpaa2_eth_channel *ch; + int err; + bool up; + + ch = priv->channel[qid]; + if (!ch->xsk_pool) + return -EINVAL; + + up = netif_running(dev); + if (up) + dev_close(dev); + + xsk_pool_dma_unmap(pool, 0); + err = xdp_rxq_info_reg_mem_model(&ch->xdp_rxq, + MEM_TYPE_PAGE_ORDER0, NULL); + if (err) + netdev_err(dev, "xsk_rxq_info_reg_mem_model() failed (err = %d)\n", + err); + + dpaa2_eth_free_dpbp(priv, ch->bp); + + ch->xsk_zc = false; + ch->xsk_pool = NULL; + ch->xsk_tx_pkts_sent = 0; + ch->bp = priv->bp[DPAA2_ETH_DEFAULT_BP_IDX]; + + dpaa2_eth_setup_consume_func(priv, ch, DPAA2_RX_FQ, dpaa2_eth_rx); + + dpaa2_xsk_set_bp_per_qdbin(priv, &pools_params); + err = dpni_set_pools(priv->mc_io, 0, priv->mc_token, &pools_params); + if (err) + netdev_err(dev, "dpni_set_pools() failed\n"); + + if (up) { + err = dev_open(dev, NULL); + if (err) + return err; + } + + return 0; +} + +static int dpaa2_xsk_enable_pool(struct net_device *dev, + struct xsk_buff_pool *pool, + u16 qid) +{ + struct dpaa2_eth_priv *priv = netdev_priv(dev); + struct dpni_pools_cfg pools_params = { 0 }; + struct dpaa2_eth_channel *ch; + int err, err2; + bool up; + + if (priv->dpni_attrs.wriop_version < DPAA2_WRIOP_VERSION(3, 0, 0)) { + netdev_err(dev, "AF_XDP zero-copy not supported on devices <= WRIOP(3, 0, 0)\n"); + return -EOPNOTSUPP; + } + + if (priv->dpni_attrs.num_queues > 8) { + netdev_err(dev, "AF_XDP zero-copy not supported on DPNI with more then 8 queues\n"); + return -EOPNOTSUPP; + } + + up = netif_running(dev); + if (up) + dev_close(dev); + + err = xsk_pool_dma_map(pool, priv->net_dev->dev.parent, 0); + if (err) { + netdev_err(dev, "xsk_pool_dma_map() failed (err = %d)\n", + err); + goto err_dma_unmap; + } + + ch = priv->channel[qid]; + err = xdp_rxq_info_reg_mem_model(&ch->xdp_rxq, MEM_TYPE_XSK_BUFF_POOL, NULL); + if (err) { + netdev_err(dev, "xdp_rxq_info_reg_mem_model() failed (err = %d)\n", err); + goto err_mem_model; + } + xsk_pool_set_rxq_info(pool, &ch->xdp_rxq); + + priv->bp[priv->num_bps] = dpaa2_eth_allocate_dpbp(priv); + if (IS_ERR(priv->bp[priv->num_bps])) { + err = PTR_ERR(priv->bp[priv->num_bps]); + goto err_bp_alloc; + } + ch->xsk_zc = true; + ch->xsk_pool = pool; + ch->bp = priv->bp[priv->num_bps++]; + + dpaa2_eth_setup_consume_func(priv, ch, DPAA2_RX_FQ, dpaa2_xsk_rx); + + dpaa2_xsk_set_bp_per_qdbin(priv, &pools_params); + err = dpni_set_pools(priv->mc_io, 0, priv->mc_token, &pools_params); + if (err) { + netdev_err(dev, "dpni_set_pools() failed\n"); + goto err_set_pools; + } + + if (up) { + err = dev_open(dev, NULL); + if (err) + return err; + } + + return 0; + +err_set_pools: + err2 = dpaa2_xsk_disable_pool(dev, qid); + if (err2) + netdev_err(dev, "dpaa2_xsk_disable_pool() failed %d\n", err2); +err_bp_alloc: + err2 = xdp_rxq_info_reg_mem_model(&priv->channel[qid]->xdp_rxq, + MEM_TYPE_PAGE_ORDER0, NULL); + if (err2) + netdev_err(dev, "xsk_rxq_info_reg_mem_model() failed with %d)\n", err2); +err_mem_model: + xsk_pool_dma_unmap(pool, 0); +err_dma_unmap: + if (up) + dev_open(dev, NULL); + + return err; +} + +int dpaa2_xsk_setup_pool(struct net_device *dev, struct xsk_buff_pool *pool, u16 qid) +{ + return pool ? dpaa2_xsk_enable_pool(dev, pool, qid) : + dpaa2_xsk_disable_pool(dev, qid); +} + +int dpaa2_xsk_wakeup(struct net_device *dev, u32 qid, u32 flags) +{ + struct dpaa2_eth_priv *priv = netdev_priv(dev); + struct dpaa2_eth_channel *ch = priv->channel[qid]; + + if (!priv->link_state.up) + return -ENETDOWN; + + if (!priv->xdp_prog) + return -EINVAL; + + if (!ch->xsk_zc) + return -EINVAL; + + /* We do not have access to a per channel SW interrupt, so instead we + * schedule a NAPI instance. + */ + if (!napi_if_scheduled_mark_missed(&ch->napi)) + napi_schedule(&ch->napi); + + return 0; +} + +static int dpaa2_xsk_tx_build_fd(struct dpaa2_eth_priv *priv, + struct dpaa2_eth_channel *ch, + struct dpaa2_fd *fd, + struct xdp_desc *xdp_desc) +{ + struct device *dev = priv->net_dev->dev.parent; + struct dpaa2_sg_entry *sgt; + struct dpaa2_eth_swa *swa; + void *sgt_buf = NULL; + dma_addr_t sgt_addr; + int sgt_buf_size; + dma_addr_t addr; + int err = 0; + + /* Prepare the HW SGT structure */ + sgt_buf_size = priv->tx_data_offset + sizeof(struct dpaa2_sg_entry); + sgt_buf = dpaa2_eth_sgt_get(priv); + if (unlikely(!sgt_buf)) + return -ENOMEM; + sgt = (struct dpaa2_sg_entry *)(sgt_buf + priv->tx_data_offset); + + /* Get the address of the XSK Tx buffer */ + addr = xsk_buff_raw_get_dma(ch->xsk_pool, xdp_desc->addr); + xsk_buff_raw_dma_sync_for_device(ch->xsk_pool, addr, xdp_desc->len); + + /* Fill in the HW SGT structure */ + dpaa2_sg_set_addr(sgt, addr); + dpaa2_sg_set_len(sgt, xdp_desc->len); + dpaa2_sg_set_final(sgt, true); + + /* Store the necessary info in the SGT buffer */ + swa = (struct dpaa2_eth_swa *)sgt_buf; + swa->type = DPAA2_ETH_SWA_XSK; + swa->xsk.sgt_size = sgt_buf_size; + + /* Separately map the SGT buffer */ + sgt_addr = dma_map_single(dev, sgt_buf, sgt_buf_size, DMA_BIDIRECTIONAL); + if (unlikely(dma_mapping_error(dev, sgt_addr))) { + err = -ENOMEM; + goto sgt_map_failed; + } + + /* Initialize FD fields */ + memset(fd, 0, sizeof(struct dpaa2_fd)); + dpaa2_fd_set_offset(fd, priv->tx_data_offset); + dpaa2_fd_set_format(fd, dpaa2_fd_sg); + dpaa2_fd_set_addr(fd, sgt_addr); + dpaa2_fd_set_len(fd, xdp_desc->len); + dpaa2_fd_set_ctrl(fd, FD_CTRL_PTA); + + return 0; + +sgt_map_failed: + dpaa2_eth_sgt_recycle(priv, sgt_buf); + + return err; +} + +bool dpaa2_xsk_tx(struct dpaa2_eth_priv *priv, + struct dpaa2_eth_channel *ch) +{ + struct xdp_desc *xdp_descs = ch->xsk_pool->tx_descs; + struct dpaa2_eth_drv_stats *percpu_extras; + struct rtnl_link_stats64 *percpu_stats; + int budget = DPAA2_ETH_TX_ZC_PER_NAPI; + int total_enqueued, enqueued; + int retries, max_retries; + struct dpaa2_eth_fq *fq; + struct dpaa2_fd *fds; + int batch, i, err; + + percpu_stats = this_cpu_ptr(priv->percpu_stats); + percpu_extras = this_cpu_ptr(priv->percpu_extras); + fds = (this_cpu_ptr(priv->fd))->array; + + /* Use the FQ with the same idx as the affine CPU */ + fq = &priv->fq[ch->nctx.desired_cpu]; + + batch = xsk_tx_peek_release_desc_batch(ch->xsk_pool, budget); + if (!batch) + return false; + + /* Create a FD for each XSK frame to be sent */ + for (i = 0; i < batch; i++) { + err = dpaa2_xsk_tx_build_fd(priv, ch, &fds[i], &xdp_descs[i]); + if (err) { + batch = i; + break; + } + + trace_dpaa2_tx_xsk_fd(priv->net_dev, &fds[i]); + } + + /* Enqueue all the created FDs */ + max_retries = batch * DPAA2_ETH_ENQUEUE_RETRIES; + total_enqueued = 0; + enqueued = 0; + retries = 0; + while (total_enqueued < batch && retries < max_retries) { + err = priv->enqueue(priv, fq, &fds[total_enqueued], 0, + batch - total_enqueued, &enqueued); + if (err == -EBUSY) { + retries++; + continue; + } + + total_enqueued += enqueued; + } + percpu_extras->tx_portal_busy += retries; + + /* Update statistics */ + percpu_stats->tx_packets += total_enqueued; + for (i = 0; i < total_enqueued; i++) + percpu_stats->tx_bytes += dpaa2_fd_get_len(&fds[i]); + for (i = total_enqueued; i < batch; i++) { + dpaa2_eth_free_tx_fd(priv, ch, fq, &fds[i], false); + percpu_stats->tx_errors++; + } + + xsk_tx_release(ch->xsk_pool); + + return total_enqueued == budget; +} |