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![Björn Töpel](/assets/img/avatar_default.png)
Fold xp_assign_dev and __xp_assign_dev. The former directly calls the latter. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://lore.kernel.org/bpf/20210122105351.11751-3-bjorn.topel@gmail.com
554 lines
12 KiB
C
554 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <net/xsk_buff_pool.h>
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#include <net/xdp_sock.h>
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#include <net/xdp_sock_drv.h>
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#include "xsk_queue.h"
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#include "xdp_umem.h"
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#include "xsk.h"
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void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs)
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{
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unsigned long flags;
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if (!xs->tx)
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return;
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spin_lock_irqsave(&pool->xsk_tx_list_lock, flags);
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list_add_rcu(&xs->tx_list, &pool->xsk_tx_list);
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spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags);
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}
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void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs)
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{
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unsigned long flags;
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if (!xs->tx)
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return;
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spin_lock_irqsave(&pool->xsk_tx_list_lock, flags);
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list_del_rcu(&xs->tx_list);
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spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags);
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}
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void xp_destroy(struct xsk_buff_pool *pool)
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{
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if (!pool)
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return;
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kvfree(pool->heads);
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kvfree(pool);
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}
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struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
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struct xdp_umem *umem)
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{
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struct xsk_buff_pool *pool;
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struct xdp_buff_xsk *xskb;
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u32 i;
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pool = kvzalloc(struct_size(pool, free_heads, umem->chunks),
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GFP_KERNEL);
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if (!pool)
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goto out;
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pool->heads = kvcalloc(umem->chunks, sizeof(*pool->heads), GFP_KERNEL);
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if (!pool->heads)
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goto out;
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pool->chunk_mask = ~((u64)umem->chunk_size - 1);
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pool->addrs_cnt = umem->size;
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pool->heads_cnt = umem->chunks;
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pool->free_heads_cnt = umem->chunks;
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pool->headroom = umem->headroom;
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pool->chunk_size = umem->chunk_size;
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pool->unaligned = umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG;
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pool->frame_len = umem->chunk_size - umem->headroom -
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XDP_PACKET_HEADROOM;
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pool->umem = umem;
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pool->addrs = umem->addrs;
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INIT_LIST_HEAD(&pool->free_list);
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INIT_LIST_HEAD(&pool->xsk_tx_list);
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spin_lock_init(&pool->xsk_tx_list_lock);
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spin_lock_init(&pool->cq_lock);
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refcount_set(&pool->users, 1);
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pool->fq = xs->fq_tmp;
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pool->cq = xs->cq_tmp;
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for (i = 0; i < pool->free_heads_cnt; i++) {
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xskb = &pool->heads[i];
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xskb->pool = pool;
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xskb->xdp.frame_sz = umem->chunk_size - umem->headroom;
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pool->free_heads[i] = xskb;
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}
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return pool;
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out:
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xp_destroy(pool);
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return NULL;
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}
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void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
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{
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u32 i;
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for (i = 0; i < pool->heads_cnt; i++)
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pool->heads[i].xdp.rxq = rxq;
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}
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EXPORT_SYMBOL(xp_set_rxq_info);
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static void xp_disable_drv_zc(struct xsk_buff_pool *pool)
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{
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struct netdev_bpf bpf;
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int err;
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ASSERT_RTNL();
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if (pool->umem->zc) {
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bpf.command = XDP_SETUP_XSK_POOL;
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bpf.xsk.pool = NULL;
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bpf.xsk.queue_id = pool->queue_id;
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err = pool->netdev->netdev_ops->ndo_bpf(pool->netdev, &bpf);
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if (err)
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WARN(1, "Failed to disable zero-copy!\n");
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}
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}
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int xp_assign_dev(struct xsk_buff_pool *pool,
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struct net_device *netdev, u16 queue_id, u16 flags)
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{
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bool force_zc, force_copy;
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struct netdev_bpf bpf;
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int err = 0;
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ASSERT_RTNL();
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force_zc = flags & XDP_ZEROCOPY;
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force_copy = flags & XDP_COPY;
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if (force_zc && force_copy)
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return -EINVAL;
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if (xsk_get_pool_from_qid(netdev, queue_id))
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return -EBUSY;
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pool->netdev = netdev;
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pool->queue_id = queue_id;
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err = xsk_reg_pool_at_qid(netdev, pool, queue_id);
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if (err)
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return err;
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if (flags & XDP_USE_NEED_WAKEUP)
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pool->uses_need_wakeup = true;
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/* Tx needs to be explicitly woken up the first time. Also
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* for supporting drivers that do not implement this
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* feature. They will always have to call sendto() or poll().
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*/
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pool->cached_need_wakeup = XDP_WAKEUP_TX;
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dev_hold(netdev);
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if (force_copy)
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/* For copy-mode, we are done. */
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return 0;
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if (!netdev->netdev_ops->ndo_bpf ||
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!netdev->netdev_ops->ndo_xsk_wakeup) {
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err = -EOPNOTSUPP;
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goto err_unreg_pool;
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}
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bpf.command = XDP_SETUP_XSK_POOL;
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bpf.xsk.pool = pool;
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bpf.xsk.queue_id = queue_id;
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err = netdev->netdev_ops->ndo_bpf(netdev, &bpf);
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if (err)
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goto err_unreg_pool;
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if (!pool->dma_pages) {
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WARN(1, "Driver did not DMA map zero-copy buffers");
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err = -EINVAL;
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goto err_unreg_xsk;
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}
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pool->umem->zc = true;
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return 0;
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err_unreg_xsk:
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xp_disable_drv_zc(pool);
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err_unreg_pool:
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if (!force_zc)
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err = 0; /* fallback to copy mode */
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if (err) {
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xsk_clear_pool_at_qid(netdev, queue_id);
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dev_put(netdev);
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}
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return err;
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}
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int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
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struct net_device *dev, u16 queue_id)
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{
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u16 flags;
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/* One fill and completion ring required for each queue id. */
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if (!pool->fq || !pool->cq)
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return -EINVAL;
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flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY;
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if (pool->uses_need_wakeup)
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flags |= XDP_USE_NEED_WAKEUP;
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return xp_assign_dev(pool, dev, queue_id, flags);
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}
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void xp_clear_dev(struct xsk_buff_pool *pool)
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{
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if (!pool->netdev)
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return;
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xp_disable_drv_zc(pool);
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xsk_clear_pool_at_qid(pool->netdev, pool->queue_id);
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dev_put(pool->netdev);
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pool->netdev = NULL;
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}
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static void xp_release_deferred(struct work_struct *work)
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{
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struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool,
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work);
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rtnl_lock();
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xp_clear_dev(pool);
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rtnl_unlock();
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if (pool->fq) {
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xskq_destroy(pool->fq);
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pool->fq = NULL;
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}
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if (pool->cq) {
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xskq_destroy(pool->cq);
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pool->cq = NULL;
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}
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xdp_put_umem(pool->umem, false);
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xp_destroy(pool);
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}
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void xp_get_pool(struct xsk_buff_pool *pool)
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{
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refcount_inc(&pool->users);
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}
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bool xp_put_pool(struct xsk_buff_pool *pool)
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{
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if (!pool)
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return false;
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if (refcount_dec_and_test(&pool->users)) {
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INIT_WORK(&pool->work, xp_release_deferred);
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schedule_work(&pool->work);
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return true;
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}
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return false;
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}
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static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool)
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{
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struct xsk_dma_map *dma_map;
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list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) {
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if (dma_map->netdev == pool->netdev)
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return dma_map;
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}
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return NULL;
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}
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static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev,
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u32 nr_pages, struct xdp_umem *umem)
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{
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struct xsk_dma_map *dma_map;
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dma_map = kzalloc(sizeof(*dma_map), GFP_KERNEL);
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if (!dma_map)
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return NULL;
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dma_map->dma_pages = kvcalloc(nr_pages, sizeof(*dma_map->dma_pages), GFP_KERNEL);
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if (!dma_map->dma_pages) {
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kfree(dma_map);
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return NULL;
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}
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dma_map->netdev = netdev;
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dma_map->dev = dev;
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dma_map->dma_need_sync = false;
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dma_map->dma_pages_cnt = nr_pages;
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refcount_set(&dma_map->users, 1);
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list_add(&dma_map->list, &umem->xsk_dma_list);
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return dma_map;
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}
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static void xp_destroy_dma_map(struct xsk_dma_map *dma_map)
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{
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list_del(&dma_map->list);
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kvfree(dma_map->dma_pages);
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kfree(dma_map);
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}
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static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs)
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{
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dma_addr_t *dma;
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u32 i;
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for (i = 0; i < dma_map->dma_pages_cnt; i++) {
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dma = &dma_map->dma_pages[i];
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if (*dma) {
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dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE,
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DMA_BIDIRECTIONAL, attrs);
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*dma = 0;
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}
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}
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xp_destroy_dma_map(dma_map);
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}
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void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs)
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{
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struct xsk_dma_map *dma_map;
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if (pool->dma_pages_cnt == 0)
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return;
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dma_map = xp_find_dma_map(pool);
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if (!dma_map) {
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WARN(1, "Could not find dma_map for device");
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return;
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}
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if (!refcount_dec_and_test(&dma_map->users))
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return;
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__xp_dma_unmap(dma_map, attrs);
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kvfree(pool->dma_pages);
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pool->dma_pages_cnt = 0;
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pool->dev = NULL;
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}
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EXPORT_SYMBOL(xp_dma_unmap);
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static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map)
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{
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u32 i;
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for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) {
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if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1])
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dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK;
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else
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dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK;
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}
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}
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static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map)
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{
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pool->dma_pages = kvcalloc(dma_map->dma_pages_cnt, sizeof(*pool->dma_pages), GFP_KERNEL);
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if (!pool->dma_pages)
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return -ENOMEM;
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pool->dev = dma_map->dev;
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pool->dma_pages_cnt = dma_map->dma_pages_cnt;
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pool->dma_need_sync = dma_map->dma_need_sync;
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memcpy(pool->dma_pages, dma_map->dma_pages,
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pool->dma_pages_cnt * sizeof(*pool->dma_pages));
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return 0;
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}
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int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
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unsigned long attrs, struct page **pages, u32 nr_pages)
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{
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struct xsk_dma_map *dma_map;
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dma_addr_t dma;
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int err;
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u32 i;
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dma_map = xp_find_dma_map(pool);
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if (dma_map) {
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err = xp_init_dma_info(pool, dma_map);
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if (err)
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return err;
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refcount_inc(&dma_map->users);
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return 0;
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}
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dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem);
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if (!dma_map)
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return -ENOMEM;
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for (i = 0; i < dma_map->dma_pages_cnt; i++) {
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dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE,
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DMA_BIDIRECTIONAL, attrs);
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if (dma_mapping_error(dev, dma)) {
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__xp_dma_unmap(dma_map, attrs);
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return -ENOMEM;
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}
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if (dma_need_sync(dev, dma))
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dma_map->dma_need_sync = true;
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dma_map->dma_pages[i] = dma;
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}
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if (pool->unaligned)
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xp_check_dma_contiguity(dma_map);
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err = xp_init_dma_info(pool, dma_map);
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if (err) {
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__xp_dma_unmap(dma_map, attrs);
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return err;
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}
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return 0;
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}
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EXPORT_SYMBOL(xp_dma_map);
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static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool,
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u64 addr)
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{
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return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size);
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}
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static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr)
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{
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*addr = xp_unaligned_extract_addr(*addr);
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if (*addr >= pool->addrs_cnt ||
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*addr + pool->chunk_size > pool->addrs_cnt ||
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xp_addr_crosses_non_contig_pg(pool, *addr))
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return false;
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return true;
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}
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static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr)
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{
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*addr = xp_aligned_extract_addr(pool, *addr);
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return *addr < pool->addrs_cnt;
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}
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static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool)
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{
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struct xdp_buff_xsk *xskb;
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u64 addr;
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bool ok;
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if (pool->free_heads_cnt == 0)
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return NULL;
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xskb = pool->free_heads[--pool->free_heads_cnt];
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for (;;) {
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if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) {
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pool->fq->queue_empty_descs++;
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xp_release(xskb);
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return NULL;
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}
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ok = pool->unaligned ? xp_check_unaligned(pool, &addr) :
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xp_check_aligned(pool, &addr);
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if (!ok) {
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pool->fq->invalid_descs++;
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xskq_cons_release(pool->fq);
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continue;
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}
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break;
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}
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xskq_cons_release(pool->fq);
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xskb->orig_addr = addr;
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xskb->xdp.data_hard_start = pool->addrs + addr + pool->headroom;
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if (pool->dma_pages_cnt) {
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xskb->frame_dma = (pool->dma_pages[addr >> PAGE_SHIFT] &
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~XSK_NEXT_PG_CONTIG_MASK) +
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(addr & ~PAGE_MASK);
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xskb->dma = xskb->frame_dma + pool->headroom +
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XDP_PACKET_HEADROOM;
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}
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return xskb;
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}
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struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool)
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{
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struct xdp_buff_xsk *xskb;
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if (!pool->free_list_cnt) {
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xskb = __xp_alloc(pool);
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if (!xskb)
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return NULL;
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} else {
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pool->free_list_cnt--;
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xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk,
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free_list_node);
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list_del(&xskb->free_list_node);
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}
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xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM;
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xskb->xdp.data_meta = xskb->xdp.data;
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if (pool->dma_need_sync) {
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dma_sync_single_range_for_device(pool->dev, xskb->dma, 0,
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pool->frame_len,
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DMA_BIDIRECTIONAL);
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}
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return &xskb->xdp;
|
|
}
|
|
EXPORT_SYMBOL(xp_alloc);
|
|
|
|
bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count)
|
|
{
|
|
if (pool->free_list_cnt >= count)
|
|
return true;
|
|
return xskq_cons_has_entries(pool->fq, count - pool->free_list_cnt);
|
|
}
|
|
EXPORT_SYMBOL(xp_can_alloc);
|
|
|
|
void xp_free(struct xdp_buff_xsk *xskb)
|
|
{
|
|
xskb->pool->free_list_cnt++;
|
|
list_add(&xskb->free_list_node, &xskb->pool->free_list);
|
|
}
|
|
EXPORT_SYMBOL(xp_free);
|
|
|
|
void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
|
|
{
|
|
addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
|
|
return pool->addrs + addr;
|
|
}
|
|
EXPORT_SYMBOL(xp_raw_get_data);
|
|
|
|
dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr)
|
|
{
|
|
addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
|
|
return (pool->dma_pages[addr >> PAGE_SHIFT] &
|
|
~XSK_NEXT_PG_CONTIG_MASK) +
|
|
(addr & ~PAGE_MASK);
|
|
}
|
|
EXPORT_SYMBOL(xp_raw_get_dma);
|
|
|
|
void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb)
|
|
{
|
|
dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
|
|
xskb->pool->frame_len, DMA_BIDIRECTIONAL);
|
|
}
|
|
EXPORT_SYMBOL(xp_dma_sync_for_cpu_slow);
|
|
|
|
void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
|
|
size_t size)
|
|
{
|
|
dma_sync_single_range_for_device(pool->dev, dma, 0,
|
|
size, DMA_BIDIRECTIONAL);
|
|
}
|
|
EXPORT_SYMBOL(xp_dma_sync_for_device_slow);
|