| // SPDX-License-Identifier: GPL-2.0 |
| /* XDP sockets |
| * |
| * AF_XDP sockets allows a channel between XDP programs and userspace |
| * applications. |
| * Copyright(c) 2018 Intel Corporation. |
| * |
| * Author(s): Björn Töpel <bjorn.topel@intel.com> |
| * Magnus Karlsson <magnus.karlsson@intel.com> |
| */ |
| |
| #define pr_fmt(fmt) "AF_XDP: %s: " fmt, __func__ |
| |
| #include <linux/if_xdp.h> |
| #include <linux/init.h> |
| #include <linux/sched/mm.h> |
| #include <linux/sched/signal.h> |
| #include <linux/sched/task.h> |
| #include <linux/socket.h> |
| #include <linux/file.h> |
| #include <linux/uaccess.h> |
| #include <linux/net.h> |
| #include <linux/netdevice.h> |
| #include <linux/rculist.h> |
| #include <linux/vmalloc.h> |
| #include <net/xdp_sock_drv.h> |
| #include <net/busy_poll.h> |
| #include <net/netdev_rx_queue.h> |
| #include <net/xdp.h> |
| |
| #include "xsk_queue.h" |
| #include "xdp_umem.h" |
| #include "xsk.h" |
| |
| #define TX_BATCH_SIZE 32 |
| #define MAX_PER_SOCKET_BUDGET (TX_BATCH_SIZE) |
| |
| void xsk_set_rx_need_wakeup(struct xsk_buff_pool *pool) |
| { |
| if (pool->cached_need_wakeup & XDP_WAKEUP_RX) |
| return; |
| |
| pool->fq->ring->flags |= XDP_RING_NEED_WAKEUP; |
| pool->cached_need_wakeup |= XDP_WAKEUP_RX; |
| } |
| EXPORT_SYMBOL(xsk_set_rx_need_wakeup); |
| |
| void xsk_set_tx_need_wakeup(struct xsk_buff_pool *pool) |
| { |
| struct xdp_sock *xs; |
| |
| if (pool->cached_need_wakeup & XDP_WAKEUP_TX) |
| return; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
| xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
| } |
| rcu_read_unlock(); |
| |
| pool->cached_need_wakeup |= XDP_WAKEUP_TX; |
| } |
| EXPORT_SYMBOL(xsk_set_tx_need_wakeup); |
| |
| void xsk_clear_rx_need_wakeup(struct xsk_buff_pool *pool) |
| { |
| if (!(pool->cached_need_wakeup & XDP_WAKEUP_RX)) |
| return; |
| |
| pool->fq->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
| pool->cached_need_wakeup &= ~XDP_WAKEUP_RX; |
| } |
| EXPORT_SYMBOL(xsk_clear_rx_need_wakeup); |
| |
| void xsk_clear_tx_need_wakeup(struct xsk_buff_pool *pool) |
| { |
| struct xdp_sock *xs; |
| |
| if (!(pool->cached_need_wakeup & XDP_WAKEUP_TX)) |
| return; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
| xs->tx->ring->flags &= ~XDP_RING_NEED_WAKEUP; |
| } |
| rcu_read_unlock(); |
| |
| pool->cached_need_wakeup &= ~XDP_WAKEUP_TX; |
| } |
| EXPORT_SYMBOL(xsk_clear_tx_need_wakeup); |
| |
| bool xsk_uses_need_wakeup(struct xsk_buff_pool *pool) |
| { |
| return pool->uses_need_wakeup; |
| } |
| EXPORT_SYMBOL(xsk_uses_need_wakeup); |
| |
| struct xsk_buff_pool *xsk_get_pool_from_qid(struct net_device *dev, |
| u16 queue_id) |
| { |
| if (queue_id < dev->real_num_rx_queues) |
| return dev->_rx[queue_id].pool; |
| if (queue_id < dev->real_num_tx_queues) |
| return dev->_tx[queue_id].pool; |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(xsk_get_pool_from_qid); |
| |
| void xsk_clear_pool_at_qid(struct net_device *dev, u16 queue_id) |
| { |
| if (queue_id < dev->num_rx_queues) |
| dev->_rx[queue_id].pool = NULL; |
| if (queue_id < dev->num_tx_queues) |
| dev->_tx[queue_id].pool = NULL; |
| } |
| |
| /* The buffer pool is stored both in the _rx struct and the _tx struct as we do |
| * not know if the device has more tx queues than rx, or the opposite. |
| * This might also change during run time. |
| */ |
| int xsk_reg_pool_at_qid(struct net_device *dev, struct xsk_buff_pool *pool, |
| u16 queue_id) |
| { |
| if (queue_id >= max_t(unsigned int, |
| dev->real_num_rx_queues, |
| dev->real_num_tx_queues)) |
| return -EINVAL; |
| |
| if (queue_id < dev->real_num_rx_queues) |
| dev->_rx[queue_id].pool = pool; |
| if (queue_id < dev->real_num_tx_queues) |
| dev->_tx[queue_id].pool = pool; |
| |
| return 0; |
| } |
| |
| static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff_xsk *xskb, u32 len, |
| u32 flags) |
| { |
| u64 addr; |
| int err; |
| |
| addr = xp_get_handle(xskb); |
| err = xskq_prod_reserve_desc(xs->rx, addr, len, flags); |
| if (err) { |
| xs->rx_queue_full++; |
| return err; |
| } |
| |
| xp_release(xskb); |
| return 0; |
| } |
| |
| static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
| { |
| struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp); |
| u32 frags = xdp_buff_has_frags(xdp); |
| struct xdp_buff_xsk *pos, *tmp; |
| struct list_head *xskb_list; |
| u32 contd = 0; |
| int err; |
| |
| if (frags) |
| contd = XDP_PKT_CONTD; |
| |
| err = __xsk_rcv_zc(xs, xskb, len, contd); |
| if (err) |
| goto err; |
| if (likely(!frags)) |
| return 0; |
| |
| xskb_list = &xskb->pool->xskb_list; |
| list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) { |
| if (list_is_singular(xskb_list)) |
| contd = 0; |
| len = pos->xdp.data_end - pos->xdp.data; |
| err = __xsk_rcv_zc(xs, pos, len, contd); |
| if (err) |
| goto err; |
| list_del(&pos->xskb_list_node); |
| } |
| |
| return 0; |
| err: |
| xsk_buff_free(xdp); |
| return err; |
| } |
| |
| static void *xsk_copy_xdp_start(struct xdp_buff *from) |
| { |
| if (unlikely(xdp_data_meta_unsupported(from))) |
| return from->data; |
| else |
| return from->data_meta; |
| } |
| |
| static u32 xsk_copy_xdp(void *to, void **from, u32 to_len, |
| u32 *from_len, skb_frag_t **frag, u32 rem) |
| { |
| u32 copied = 0; |
| |
| while (1) { |
| u32 copy_len = min_t(u32, *from_len, to_len); |
| |
| memcpy(to, *from, copy_len); |
| copied += copy_len; |
| if (rem == copied) |
| return copied; |
| |
| if (*from_len == copy_len) { |
| *from = skb_frag_address(*frag); |
| *from_len = skb_frag_size((*frag)++); |
| } else { |
| *from += copy_len; |
| *from_len -= copy_len; |
| } |
| if (to_len == copy_len) |
| return copied; |
| |
| to_len -= copy_len; |
| to += copy_len; |
| } |
| } |
| |
| static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
| { |
| u32 frame_size = xsk_pool_get_rx_frame_size(xs->pool); |
| void *copy_from = xsk_copy_xdp_start(xdp), *copy_to; |
| u32 from_len, meta_len, rem, num_desc; |
| struct xdp_buff_xsk *xskb; |
| struct xdp_buff *xsk_xdp; |
| skb_frag_t *frag; |
| |
| from_len = xdp->data_end - copy_from; |
| meta_len = xdp->data - copy_from; |
| rem = len + meta_len; |
| |
| if (len <= frame_size && !xdp_buff_has_frags(xdp)) { |
| int err; |
| |
| xsk_xdp = xsk_buff_alloc(xs->pool); |
| if (!xsk_xdp) { |
| xs->rx_dropped++; |
| return -ENOMEM; |
| } |
| memcpy(xsk_xdp->data - meta_len, copy_from, rem); |
| xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); |
| err = __xsk_rcv_zc(xs, xskb, len, 0); |
| if (err) { |
| xsk_buff_free(xsk_xdp); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| num_desc = (len - 1) / frame_size + 1; |
| |
| if (!xsk_buff_can_alloc(xs->pool, num_desc)) { |
| xs->rx_dropped++; |
| return -ENOMEM; |
| } |
| if (xskq_prod_nb_free(xs->rx, num_desc) < num_desc) { |
| xs->rx_queue_full++; |
| return -ENOBUFS; |
| } |
| |
| if (xdp_buff_has_frags(xdp)) { |
| struct skb_shared_info *sinfo; |
| |
| sinfo = xdp_get_shared_info_from_buff(xdp); |
| frag = &sinfo->frags[0]; |
| } |
| |
| do { |
| u32 to_len = frame_size + meta_len; |
| u32 copied; |
| |
| xsk_xdp = xsk_buff_alloc(xs->pool); |
| copy_to = xsk_xdp->data - meta_len; |
| |
| copied = xsk_copy_xdp(copy_to, ©_from, to_len, &from_len, &frag, rem); |
| rem -= copied; |
| |
| xskb = container_of(xsk_xdp, struct xdp_buff_xsk, xdp); |
| __xsk_rcv_zc(xs, xskb, copied - meta_len, rem ? XDP_PKT_CONTD : 0); |
| meta_len = 0; |
| } while (rem); |
| |
| return 0; |
| } |
| |
| static bool xsk_tx_writeable(struct xdp_sock *xs) |
| { |
| if (xskq_cons_present_entries(xs->tx) > xs->tx->nentries / 2) |
| return false; |
| |
| return true; |
| } |
| |
| static bool xsk_is_bound(struct xdp_sock *xs) |
| { |
| if (READ_ONCE(xs->state) == XSK_BOUND) { |
| /* Matches smp_wmb() in bind(). */ |
| smp_rmb(); |
| return true; |
| } |
| return false; |
| } |
| |
| static int xsk_rcv_check(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len) |
| { |
| if (!xsk_is_bound(xs)) |
| return -ENXIO; |
| |
| if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) |
| return -EINVAL; |
| |
| if (len > xsk_pool_get_rx_frame_size(xs->pool) && !xs->sg) { |
| xs->rx_dropped++; |
| return -ENOSPC; |
| } |
| |
| sk_mark_napi_id_once_xdp(&xs->sk, xdp); |
| return 0; |
| } |
| |
| static void xsk_flush(struct xdp_sock *xs) |
| { |
| xskq_prod_submit(xs->rx); |
| __xskq_cons_release(xs->pool->fq); |
| sock_def_readable(&xs->sk); |
| } |
| |
| int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
| { |
| u32 len = xdp_get_buff_len(xdp); |
| int err; |
| |
| spin_lock_bh(&xs->rx_lock); |
| err = xsk_rcv_check(xs, xdp, len); |
| if (!err) { |
| err = __xsk_rcv(xs, xdp, len); |
| xsk_flush(xs); |
| } |
| spin_unlock_bh(&xs->rx_lock); |
| return err; |
| } |
| |
| static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp) |
| { |
| u32 len = xdp_get_buff_len(xdp); |
| int err; |
| |
| err = xsk_rcv_check(xs, xdp, len); |
| if (err) |
| return err; |
| |
| if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) { |
| len = xdp->data_end - xdp->data; |
| return xsk_rcv_zc(xs, xdp, len); |
| } |
| |
| err = __xsk_rcv(xs, xdp, len); |
| if (!err) |
| xdp_return_buff(xdp); |
| return err; |
| } |
| |
| int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp) |
| { |
| int err; |
| |
| err = xsk_rcv(xs, xdp); |
| if (err) |
| return err; |
| |
| if (!xs->flush_node.prev) { |
| struct list_head *flush_list = bpf_net_ctx_get_xskmap_flush_list(); |
| |
| list_add(&xs->flush_node, flush_list); |
| } |
| |
| return 0; |
| } |
| |
| void __xsk_map_flush(struct list_head *flush_list) |
| { |
| struct xdp_sock *xs, *tmp; |
| |
| list_for_each_entry_safe(xs, tmp, flush_list, flush_node) { |
| xsk_flush(xs); |
| __list_del_clearprev(&xs->flush_node); |
| } |
| } |
| |
| void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries) |
| { |
| xskq_prod_submit_n(pool->cq, nb_entries); |
| } |
| EXPORT_SYMBOL(xsk_tx_completed); |
| |
| void xsk_tx_release(struct xsk_buff_pool *pool) |
| { |
| struct xdp_sock *xs; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
| __xskq_cons_release(xs->tx); |
| if (xsk_tx_writeable(xs)) |
| xs->sk.sk_write_space(&xs->sk); |
| } |
| rcu_read_unlock(); |
| } |
| EXPORT_SYMBOL(xsk_tx_release); |
| |
| bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) |
| { |
| bool budget_exhausted = false; |
| struct xdp_sock *xs; |
| |
| rcu_read_lock(); |
| again: |
| list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) { |
| if (xs->tx_budget_spent >= MAX_PER_SOCKET_BUDGET) { |
| budget_exhausted = true; |
| continue; |
| } |
| |
| if (!xskq_cons_peek_desc(xs->tx, desc, pool)) { |
| if (xskq_has_descs(xs->tx)) |
| xskq_cons_release(xs->tx); |
| continue; |
| } |
| |
| xs->tx_budget_spent++; |
| |
| /* This is the backpressure mechanism for the Tx path. |
| * Reserve space in the completion queue and only proceed |
| * if there is space in it. This avoids having to implement |
| * any buffering in the Tx path. |
| */ |
| if (xskq_prod_reserve_addr(pool->cq, desc->addr)) |
| goto out; |
| |
| xskq_cons_release(xs->tx); |
| rcu_read_unlock(); |
| return true; |
| } |
| |
| if (budget_exhausted) { |
| list_for_each_entry_rcu(xs, &pool->xsk_tx_list, tx_list) |
| xs->tx_budget_spent = 0; |
| |
| budget_exhausted = false; |
| goto again; |
| } |
| |
| out: |
| rcu_read_unlock(); |
| return false; |
| } |
| EXPORT_SYMBOL(xsk_tx_peek_desc); |
| |
| static u32 xsk_tx_peek_release_fallback(struct xsk_buff_pool *pool, u32 max_entries) |
| { |
| struct xdp_desc *descs = pool->tx_descs; |
| u32 nb_pkts = 0; |
| |
| while (nb_pkts < max_entries && xsk_tx_peek_desc(pool, &descs[nb_pkts])) |
| nb_pkts++; |
| |
| xsk_tx_release(pool); |
| return nb_pkts; |
| } |
| |
| u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 nb_pkts) |
| { |
| struct xdp_sock *xs; |
| |
| rcu_read_lock(); |
| if (!list_is_singular(&pool->xsk_tx_list)) { |
| /* Fallback to the non-batched version */ |
| rcu_read_unlock(); |
| return xsk_tx_peek_release_fallback(pool, nb_pkts); |
| } |
| |
| xs = list_first_or_null_rcu(&pool->xsk_tx_list, struct xdp_sock, tx_list); |
| if (!xs) { |
| nb_pkts = 0; |
| goto out; |
| } |
| |
| nb_pkts = xskq_cons_nb_entries(xs->tx, nb_pkts); |
| |
| /* This is the backpressure mechanism for the Tx path. Try to |
| * reserve space in the completion queue for all packets, but |
| * if there are fewer slots available, just process that many |
| * packets. This avoids having to implement any buffering in |
| * the Tx path. |
| */ |
| nb_pkts = xskq_prod_nb_free(pool->cq, nb_pkts); |
| if (!nb_pkts) |
| goto out; |
| |
| nb_pkts = xskq_cons_read_desc_batch(xs->tx, pool, nb_pkts); |
| if (!nb_pkts) { |
| xs->tx->queue_empty_descs++; |
| goto out; |
| } |
| |
| __xskq_cons_release(xs->tx); |
| xskq_prod_write_addr_batch(pool->cq, pool->tx_descs, nb_pkts); |
| xs->sk.sk_write_space(&xs->sk); |
| |
| out: |
| rcu_read_unlock(); |
| return nb_pkts; |
| } |
| EXPORT_SYMBOL(xsk_tx_peek_release_desc_batch); |
| |
| static int xsk_wakeup(struct xdp_sock *xs, u8 flags) |
| { |
| struct net_device *dev = xs->dev; |
| |
| return dev->netdev_ops->ndo_xsk_wakeup(dev, xs->queue_id, flags); |
| } |
| |
| static int xsk_cq_reserve_addr_locked(struct xdp_sock *xs, u64 addr) |
| { |
| unsigned long flags; |
| int ret; |
| |
| spin_lock_irqsave(&xs->pool->cq_lock, flags); |
| ret = xskq_prod_reserve_addr(xs->pool->cq, addr); |
| spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
| |
| return ret; |
| } |
| |
| static void xsk_cq_submit_locked(struct xdp_sock *xs, u32 n) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&xs->pool->cq_lock, flags); |
| xskq_prod_submit_n(xs->pool->cq, n); |
| spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
| } |
| |
| static void xsk_cq_cancel_locked(struct xdp_sock *xs, u32 n) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&xs->pool->cq_lock, flags); |
| xskq_prod_cancel_n(xs->pool->cq, n); |
| spin_unlock_irqrestore(&xs->pool->cq_lock, flags); |
| } |
| |
| static u32 xsk_get_num_desc(struct sk_buff *skb) |
| { |
| return skb ? (long)skb_shinfo(skb)->destructor_arg : 0; |
| } |
| |
| static void xsk_destruct_skb(struct sk_buff *skb) |
| { |
| struct xsk_tx_metadata_compl *compl = &skb_shinfo(skb)->xsk_meta; |
| |
| if (compl->tx_timestamp) { |
| /* sw completion timestamp, not a real one */ |
| *compl->tx_timestamp = ktime_get_tai_fast_ns(); |
| } |
| |
| xsk_cq_submit_locked(xdp_sk(skb->sk), xsk_get_num_desc(skb)); |
| sock_wfree(skb); |
| } |
| |
| static void xsk_set_destructor_arg(struct sk_buff *skb) |
| { |
| long num = xsk_get_num_desc(xdp_sk(skb->sk)->skb) + 1; |
| |
| skb_shinfo(skb)->destructor_arg = (void *)num; |
| } |
| |
| static void xsk_consume_skb(struct sk_buff *skb) |
| { |
| struct xdp_sock *xs = xdp_sk(skb->sk); |
| |
| skb->destructor = sock_wfree; |
| xsk_cq_cancel_locked(xs, xsk_get_num_desc(skb)); |
| /* Free skb without triggering the perf drop trace */ |
| consume_skb(skb); |
| xs->skb = NULL; |
| } |
| |
| static void xsk_drop_skb(struct sk_buff *skb) |
| { |
| xdp_sk(skb->sk)->tx->invalid_descs += xsk_get_num_desc(skb); |
| xsk_consume_skb(skb); |
| } |
| |
| static struct sk_buff *xsk_build_skb_zerocopy(struct xdp_sock *xs, |
| struct xdp_desc *desc) |
| { |
| struct xsk_buff_pool *pool = xs->pool; |
| u32 hr, len, ts, offset, copy, copied; |
| struct sk_buff *skb = xs->skb; |
| struct page *page; |
| void *buffer; |
| int err, i; |
| u64 addr; |
| |
| if (!skb) { |
| hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(xs->dev->needed_headroom)); |
| |
| skb = sock_alloc_send_skb(&xs->sk, hr, 1, &err); |
| if (unlikely(!skb)) |
| return ERR_PTR(err); |
| |
| skb_reserve(skb, hr); |
| } |
| |
| addr = desc->addr; |
| len = desc->len; |
| ts = pool->unaligned ? len : pool->chunk_size; |
| |
| buffer = xsk_buff_raw_get_data(pool, addr); |
| offset = offset_in_page(buffer); |
| addr = buffer - pool->addrs; |
| |
| for (copied = 0, i = skb_shinfo(skb)->nr_frags; copied < len; i++) { |
| if (unlikely(i >= MAX_SKB_FRAGS)) |
| return ERR_PTR(-EOVERFLOW); |
| |
| page = pool->umem->pgs[addr >> PAGE_SHIFT]; |
| get_page(page); |
| |
| copy = min_t(u32, PAGE_SIZE - offset, len - copied); |
| skb_fill_page_desc(skb, i, page, offset, copy); |
| |
| copied += copy; |
| addr += copy; |
| offset = 0; |
| } |
| |
| skb->len += len; |
| skb->data_len += len; |
| skb->truesize += ts; |
| |
| refcount_add(ts, &xs->sk.sk_wmem_alloc); |
| |
| return skb; |
| } |
| |
| static struct sk_buff *xsk_build_skb(struct xdp_sock *xs, |
| struct xdp_desc *desc) |
| { |
| struct xsk_tx_metadata *meta = NULL; |
| struct net_device *dev = xs->dev; |
| struct sk_buff *skb = xs->skb; |
| bool first_frag = false; |
| int err; |
| |
| if (dev->priv_flags & IFF_TX_SKB_NO_LINEAR) { |
| skb = xsk_build_skb_zerocopy(xs, desc); |
| if (IS_ERR(skb)) { |
| err = PTR_ERR(skb); |
| goto free_err; |
| } |
| } else { |
| u32 hr, tr, len; |
| void *buffer; |
| |
| buffer = xsk_buff_raw_get_data(xs->pool, desc->addr); |
| len = desc->len; |
| |
| if (!skb) { |
| hr = max(NET_SKB_PAD, L1_CACHE_ALIGN(dev->needed_headroom)); |
| tr = dev->needed_tailroom; |
| skb = sock_alloc_send_skb(&xs->sk, hr + len + tr, 1, &err); |
| if (unlikely(!skb)) |
| goto free_err; |
| |
| skb_reserve(skb, hr); |
| skb_put(skb, len); |
| |
| err = skb_store_bits(skb, 0, buffer, len); |
| if (unlikely(err)) { |
| kfree_skb(skb); |
| goto free_err; |
| } |
| |
| first_frag = true; |
| } else { |
| int nr_frags = skb_shinfo(skb)->nr_frags; |
| struct page *page; |
| u8 *vaddr; |
| |
| if (unlikely(nr_frags == (MAX_SKB_FRAGS - 1) && xp_mb_desc(desc))) { |
| err = -EOVERFLOW; |
| goto free_err; |
| } |
| |
| page = alloc_page(xs->sk.sk_allocation); |
| if (unlikely(!page)) { |
| err = -EAGAIN; |
| goto free_err; |
| } |
| |
| vaddr = kmap_local_page(page); |
| memcpy(vaddr, buffer, len); |
| kunmap_local(vaddr); |
| |
| skb_add_rx_frag(skb, nr_frags, page, 0, len, PAGE_SIZE); |
| refcount_add(PAGE_SIZE, &xs->sk.sk_wmem_alloc); |
| } |
| |
| if (first_frag && desc->options & XDP_TX_METADATA) { |
| if (unlikely(xs->pool->tx_metadata_len == 0)) { |
| err = -EINVAL; |
| goto free_err; |
| } |
| |
| meta = buffer - xs->pool->tx_metadata_len; |
| if (unlikely(!xsk_buff_valid_tx_metadata(meta))) { |
| err = -EINVAL; |
| goto free_err; |
| } |
| |
| if (meta->flags & XDP_TXMD_FLAGS_CHECKSUM) { |
| if (unlikely(meta->request.csum_start + |
| meta->request.csum_offset + |
| sizeof(__sum16) > len)) { |
| err = -EINVAL; |
| goto free_err; |
| } |
| |
| skb->csum_start = hr + meta->request.csum_start; |
| skb->csum_offset = meta->request.csum_offset; |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| |
| if (unlikely(xs->pool->tx_sw_csum)) { |
| err = skb_checksum_help(skb); |
| if (err) |
| goto free_err; |
| } |
| } |
| } |
| } |
| |
| skb->dev = dev; |
| skb->priority = READ_ONCE(xs->sk.sk_priority); |
| skb->mark = READ_ONCE(xs->sk.sk_mark); |
| skb->destructor = xsk_destruct_skb; |
| xsk_tx_metadata_to_compl(meta, &skb_shinfo(skb)->xsk_meta); |
| xsk_set_destructor_arg(skb); |
| |
| return skb; |
| |
| free_err: |
| if (err == -EOVERFLOW) { |
| /* Drop the packet */ |
| xsk_set_destructor_arg(xs->skb); |
| xsk_drop_skb(xs->skb); |
| xskq_cons_release(xs->tx); |
| } else { |
| /* Let application retry */ |
| xsk_cq_cancel_locked(xs, 1); |
| } |
| |
| return ERR_PTR(err); |
| } |
| |
| static int __xsk_generic_xmit(struct sock *sk) |
| { |
| struct xdp_sock *xs = xdp_sk(sk); |
| u32 max_batch = TX_BATCH_SIZE; |
| bool sent_frame = false; |
| struct xdp_desc desc; |
| struct sk_buff *skb; |
| int err = 0; |
| |
| mutex_lock(&xs->mutex); |
| |
| /* Since we dropped the RCU read lock, the socket state might have changed. */ |
| if (unlikely(!xsk_is_bound(xs))) { |
| err = -ENXIO; |
| goto out; |
| } |
| |
| if (xs->queue_id >= xs->dev->real_num_tx_queues) |
| goto out; |
| |
| while (xskq_cons_peek_desc(xs->tx, &desc, xs->pool)) { |
| if (max_batch-- == 0) { |
| err = -EAGAIN; |
| goto out; |
| } |
| |
| /* This is the backpressure mechanism for the Tx path. |
| * Reserve space in the completion queue and only proceed |
| * if there is space in it. This avoids having to implement |
| * any buffering in the Tx path. |
| */ |
| if (xsk_cq_reserve_addr_locked(xs, desc.addr)) |
| goto out; |
| |
| skb = xsk_build_skb(xs, &desc); |
| if (IS_ERR(skb)) { |
| err = PTR_ERR(skb); |
| if (err != -EOVERFLOW) |
| goto out; |
| err = 0; |
| continue; |
| } |
| |
| xskq_cons_release(xs->tx); |
| |
| if (xp_mb_desc(&desc)) { |
| xs->skb = skb; |
| continue; |
| } |
| |
| err = __dev_direct_xmit(skb, xs->queue_id); |
| if (err == NETDEV_TX_BUSY) { |
| /* Tell user-space to retry the send */ |
| xskq_cons_cancel_n(xs->tx, xsk_get_num_desc(skb)); |
| xsk_consume_skb(skb); |
| err = -EAGAIN; |
| goto out; |
| } |
| |
| /* Ignore NET_XMIT_CN as packet might have been sent */ |
| if (err == NET_XMIT_DROP) { |
| /* SKB completed but not sent */ |
| err = -EBUSY; |
| xs->skb = NULL; |
| goto out; |
| } |
| |
| sent_frame = true; |
| xs->skb = NULL; |
| } |
| |
| if (xskq_has_descs(xs->tx)) { |
| if (xs->skb) |
| xsk_drop_skb(xs->skb); |
| xskq_cons_release(xs->tx); |
| } |
| |
| out: |
| if (sent_frame) |
| if (xsk_tx_writeable(xs)) |
| sk->sk_write_space(sk); |
| |
| mutex_unlock(&xs->mutex); |
| return err; |
| } |
| |
| static int xsk_generic_xmit(struct sock *sk) |
| { |
| int ret; |
| |
| /* Drop the RCU lock since the SKB path might sleep. */ |
| rcu_read_unlock(); |
| ret = __xsk_generic_xmit(sk); |
| /* Reaquire RCU lock before going into common code. */ |
| rcu_read_lock(); |
| |
| return ret; |
| } |
| |
| static bool xsk_no_wakeup(struct sock *sk) |
| { |
| #ifdef CONFIG_NET_RX_BUSY_POLL |
| /* Prefer busy-polling, skip the wakeup. */ |
| return READ_ONCE(sk->sk_prefer_busy_poll) && READ_ONCE(sk->sk_ll_usec) && |
| READ_ONCE(sk->sk_napi_id) >= MIN_NAPI_ID; |
| #else |
| return false; |
| #endif |
| } |
| |
| static int xsk_check_common(struct xdp_sock *xs) |
| { |
| if (unlikely(!xsk_is_bound(xs))) |
| return -ENXIO; |
| if (unlikely(!(xs->dev->flags & IFF_UP))) |
| return -ENETDOWN; |
| |
| return 0; |
| } |
| |
| static int __xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
| { |
| bool need_wait = !(m->msg_flags & MSG_DONTWAIT); |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| struct xsk_buff_pool *pool; |
| int err; |
| |
| err = xsk_check_common(xs); |
| if (err) |
| return err; |
| if (unlikely(need_wait)) |
| return -EOPNOTSUPP; |
| if (unlikely(!xs->tx)) |
| return -ENOBUFS; |
| |
| if (sk_can_busy_loop(sk)) { |
| if (xs->zc) |
| __sk_mark_napi_id_once(sk, xsk_pool_get_napi_id(xs->pool)); |
| sk_busy_loop(sk, 1); /* only support non-blocking sockets */ |
| } |
| |
| if (xs->zc && xsk_no_wakeup(sk)) |
| return 0; |
| |
| pool = xs->pool; |
| if (pool->cached_need_wakeup & XDP_WAKEUP_TX) { |
| if (xs->zc) |
| return xsk_wakeup(xs, XDP_WAKEUP_TX); |
| return xsk_generic_xmit(sk); |
| } |
| return 0; |
| } |
| |
| static int xsk_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
| { |
| int ret; |
| |
| rcu_read_lock(); |
| ret = __xsk_sendmsg(sock, m, total_len); |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| static int __xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
| { |
| bool need_wait = !(flags & MSG_DONTWAIT); |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| int err; |
| |
| err = xsk_check_common(xs); |
| if (err) |
| return err; |
| if (unlikely(!xs->rx)) |
| return -ENOBUFS; |
| if (unlikely(need_wait)) |
| return -EOPNOTSUPP; |
| |
| if (sk_can_busy_loop(sk)) |
| sk_busy_loop(sk, 1); /* only support non-blocking sockets */ |
| |
| if (xsk_no_wakeup(sk)) |
| return 0; |
| |
| if (xs->pool->cached_need_wakeup & XDP_WAKEUP_RX && xs->zc) |
| return xsk_wakeup(xs, XDP_WAKEUP_RX); |
| return 0; |
| } |
| |
| static int xsk_recvmsg(struct socket *sock, struct msghdr *m, size_t len, int flags) |
| { |
| int ret; |
| |
| rcu_read_lock(); |
| ret = __xsk_recvmsg(sock, m, len, flags); |
| rcu_read_unlock(); |
| |
| return ret; |
| } |
| |
| static __poll_t xsk_poll(struct file *file, struct socket *sock, |
| struct poll_table_struct *wait) |
| { |
| __poll_t mask = 0; |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| struct xsk_buff_pool *pool; |
| |
| sock_poll_wait(file, sock, wait); |
| |
| rcu_read_lock(); |
| if (xsk_check_common(xs)) |
| goto out; |
| |
| pool = xs->pool; |
| |
| if (pool->cached_need_wakeup) { |
| if (xs->zc) |
| xsk_wakeup(xs, pool->cached_need_wakeup); |
| else if (xs->tx) |
| /* Poll needs to drive Tx also in copy mode */ |
| xsk_generic_xmit(sk); |
| } |
| |
| if (xs->rx && !xskq_prod_is_empty(xs->rx)) |
| mask |= EPOLLIN | EPOLLRDNORM; |
| if (xs->tx && xsk_tx_writeable(xs)) |
| mask |= EPOLLOUT | EPOLLWRNORM; |
| out: |
| rcu_read_unlock(); |
| return mask; |
| } |
| |
| static int xsk_init_queue(u32 entries, struct xsk_queue **queue, |
| bool umem_queue) |
| { |
| struct xsk_queue *q; |
| |
| if (entries == 0 || *queue || !is_power_of_2(entries)) |
| return -EINVAL; |
| |
| q = xskq_create(entries, umem_queue); |
| if (!q) |
| return -ENOMEM; |
| |
| /* Make sure queue is ready before it can be seen by others */ |
| smp_wmb(); |
| WRITE_ONCE(*queue, q); |
| return 0; |
| } |
| |
| static void xsk_unbind_dev(struct xdp_sock *xs) |
| { |
| struct net_device *dev = xs->dev; |
| |
| if (xs->state != XSK_BOUND) |
| return; |
| WRITE_ONCE(xs->state, XSK_UNBOUND); |
| |
| /* Wait for driver to stop using the xdp socket. */ |
| xp_del_xsk(xs->pool, xs); |
| synchronize_net(); |
| dev_put(dev); |
| } |
| |
| static struct xsk_map *xsk_get_map_list_entry(struct xdp_sock *xs, |
| struct xdp_sock __rcu ***map_entry) |
| { |
| struct xsk_map *map = NULL; |
| struct xsk_map_node *node; |
| |
| *map_entry = NULL; |
| |
| spin_lock_bh(&xs->map_list_lock); |
| node = list_first_entry_or_null(&xs->map_list, struct xsk_map_node, |
| node); |
| if (node) { |
| bpf_map_inc(&node->map->map); |
| map = node->map; |
| *map_entry = node->map_entry; |
| } |
| spin_unlock_bh(&xs->map_list_lock); |
| return map; |
| } |
| |
| static void xsk_delete_from_maps(struct xdp_sock *xs) |
| { |
| /* This function removes the current XDP socket from all the |
| * maps it resides in. We need to take extra care here, due to |
| * the two locks involved. Each map has a lock synchronizing |
| * updates to the entries, and each socket has a lock that |
| * synchronizes access to the list of maps (map_list). For |
| * deadlock avoidance the locks need to be taken in the order |
| * "map lock"->"socket map list lock". We start off by |
| * accessing the socket map list, and take a reference to the |
| * map to guarantee existence between the |
| * xsk_get_map_list_entry() and xsk_map_try_sock_delete() |
| * calls. Then we ask the map to remove the socket, which |
| * tries to remove the socket from the map. Note that there |
| * might be updates to the map between |
| * xsk_get_map_list_entry() and xsk_map_try_sock_delete(). |
| */ |
| struct xdp_sock __rcu **map_entry = NULL; |
| struct xsk_map *map; |
| |
| while ((map = xsk_get_map_list_entry(xs, &map_entry))) { |
| xsk_map_try_sock_delete(map, xs, map_entry); |
| bpf_map_put(&map->map); |
| } |
| } |
| |
| static int xsk_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| struct net *net; |
| |
| if (!sk) |
| return 0; |
| |
| net = sock_net(sk); |
| |
| if (xs->skb) |
| xsk_drop_skb(xs->skb); |
| |
| mutex_lock(&net->xdp.lock); |
| sk_del_node_init_rcu(sk); |
| mutex_unlock(&net->xdp.lock); |
| |
| sock_prot_inuse_add(net, sk->sk_prot, -1); |
| |
| xsk_delete_from_maps(xs); |
| mutex_lock(&xs->mutex); |
| xsk_unbind_dev(xs); |
| mutex_unlock(&xs->mutex); |
| |
| xskq_destroy(xs->rx); |
| xskq_destroy(xs->tx); |
| xskq_destroy(xs->fq_tmp); |
| xskq_destroy(xs->cq_tmp); |
| |
| sock_orphan(sk); |
| sock->sk = NULL; |
| |
| sock_put(sk); |
| |
| return 0; |
| } |
| |
| static struct socket *xsk_lookup_xsk_from_fd(int fd) |
| { |
| struct socket *sock; |
| int err; |
| |
| sock = sockfd_lookup(fd, &err); |
| if (!sock) |
| return ERR_PTR(-ENOTSOCK); |
| |
| if (sock->sk->sk_family != PF_XDP) { |
| sockfd_put(sock); |
| return ERR_PTR(-ENOPROTOOPT); |
| } |
| |
| return sock; |
| } |
| |
| static bool xsk_validate_queues(struct xdp_sock *xs) |
| { |
| return xs->fq_tmp && xs->cq_tmp; |
| } |
| |
| static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len) |
| { |
| struct sockaddr_xdp *sxdp = (struct sockaddr_xdp *)addr; |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| struct net_device *dev; |
| int bound_dev_if; |
| u32 flags, qid; |
| int err = 0; |
| |
| if (addr_len < sizeof(struct sockaddr_xdp)) |
| return -EINVAL; |
| if (sxdp->sxdp_family != AF_XDP) |
| return -EINVAL; |
| |
| flags = sxdp->sxdp_flags; |
| if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY | |
| XDP_USE_NEED_WAKEUP | XDP_USE_SG)) |
| return -EINVAL; |
| |
| bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
| if (bound_dev_if && bound_dev_if != sxdp->sxdp_ifindex) |
| return -EINVAL; |
| |
| rtnl_lock(); |
| mutex_lock(&xs->mutex); |
| if (xs->state != XSK_READY) { |
| err = -EBUSY; |
| goto out_release; |
| } |
| |
| dev = dev_get_by_index(sock_net(sk), sxdp->sxdp_ifindex); |
| if (!dev) { |
| err = -ENODEV; |
| goto out_release; |
| } |
| |
| if (!xs->rx && !xs->tx) { |
| err = -EINVAL; |
| goto out_unlock; |
| } |
| |
| qid = sxdp->sxdp_queue_id; |
| |
| if (flags & XDP_SHARED_UMEM) { |
| struct xdp_sock *umem_xs; |
| struct socket *sock; |
| |
| if ((flags & XDP_COPY) || (flags & XDP_ZEROCOPY) || |
| (flags & XDP_USE_NEED_WAKEUP) || (flags & XDP_USE_SG)) { |
| /* Cannot specify flags for shared sockets. */ |
| err = -EINVAL; |
| goto out_unlock; |
| } |
| |
| if (xs->umem) { |
| /* We have already our own. */ |
| err = -EINVAL; |
| goto out_unlock; |
| } |
| |
| sock = xsk_lookup_xsk_from_fd(sxdp->sxdp_shared_umem_fd); |
| if (IS_ERR(sock)) { |
| err = PTR_ERR(sock); |
| goto out_unlock; |
| } |
| |
| umem_xs = xdp_sk(sock->sk); |
| if (!xsk_is_bound(umem_xs)) { |
| err = -EBADF; |
| sockfd_put(sock); |
| goto out_unlock; |
| } |
| |
| if (umem_xs->queue_id != qid || umem_xs->dev != dev) { |
| /* Share the umem with another socket on another qid |
| * and/or device. |
| */ |
| xs->pool = xp_create_and_assign_umem(xs, |
| umem_xs->umem); |
| if (!xs->pool) { |
| err = -ENOMEM; |
| sockfd_put(sock); |
| goto out_unlock; |
| } |
| |
| err = xp_assign_dev_shared(xs->pool, umem_xs, dev, |
| qid); |
| if (err) { |
| xp_destroy(xs->pool); |
| xs->pool = NULL; |
| sockfd_put(sock); |
| goto out_unlock; |
| } |
| } else { |
| /* Share the buffer pool with the other socket. */ |
| if (xs->fq_tmp || xs->cq_tmp) { |
| /* Do not allow setting your own fq or cq. */ |
| err = -EINVAL; |
| sockfd_put(sock); |
| goto out_unlock; |
| } |
| |
| xp_get_pool(umem_xs->pool); |
| xs->pool = umem_xs->pool; |
| |
| /* If underlying shared umem was created without Tx |
| * ring, allocate Tx descs array that Tx batching API |
| * utilizes |
| */ |
| if (xs->tx && !xs->pool->tx_descs) { |
| err = xp_alloc_tx_descs(xs->pool, xs); |
| if (err) { |
| xp_put_pool(xs->pool); |
| xs->pool = NULL; |
| sockfd_put(sock); |
| goto out_unlock; |
| } |
| } |
| } |
| |
| xdp_get_umem(umem_xs->umem); |
| WRITE_ONCE(xs->umem, umem_xs->umem); |
| sockfd_put(sock); |
| } else if (!xs->umem || !xsk_validate_queues(xs)) { |
| err = -EINVAL; |
| goto out_unlock; |
| } else { |
| /* This xsk has its own umem. */ |
| xs->pool = xp_create_and_assign_umem(xs, xs->umem); |
| if (!xs->pool) { |
| err = -ENOMEM; |
| goto out_unlock; |
| } |
| |
| err = xp_assign_dev(xs->pool, dev, qid, flags); |
| if (err) { |
| xp_destroy(xs->pool); |
| xs->pool = NULL; |
| goto out_unlock; |
| } |
| } |
| |
| /* FQ and CQ are now owned by the buffer pool and cleaned up with it. */ |
| xs->fq_tmp = NULL; |
| xs->cq_tmp = NULL; |
| |
| xs->dev = dev; |
| xs->zc = xs->umem->zc; |
| xs->sg = !!(xs->umem->flags & XDP_UMEM_SG_FLAG); |
| xs->queue_id = qid; |
| xp_add_xsk(xs->pool, xs); |
| |
| out_unlock: |
| if (err) { |
| dev_put(dev); |
| } else { |
| /* Matches smp_rmb() in bind() for shared umem |
| * sockets, and xsk_is_bound(). |
| */ |
| smp_wmb(); |
| WRITE_ONCE(xs->state, XSK_BOUND); |
| } |
| out_release: |
| mutex_unlock(&xs->mutex); |
| rtnl_unlock(); |
| return err; |
| } |
| |
| struct xdp_umem_reg_v1 { |
| __u64 addr; /* Start of packet data area */ |
| __u64 len; /* Length of packet data area */ |
| __u32 chunk_size; |
| __u32 headroom; |
| }; |
| |
| struct xdp_umem_reg_v2 { |
| __u64 addr; /* Start of packet data area */ |
| __u64 len; /* Length of packet data area */ |
| __u32 chunk_size; |
| __u32 headroom; |
| __u32 flags; |
| }; |
| |
| static int xsk_setsockopt(struct socket *sock, int level, int optname, |
| sockptr_t optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| int err; |
| |
| if (level != SOL_XDP) |
| return -ENOPROTOOPT; |
| |
| switch (optname) { |
| case XDP_RX_RING: |
| case XDP_TX_RING: |
| { |
| struct xsk_queue **q; |
| int entries; |
| |
| if (optlen < sizeof(entries)) |
| return -EINVAL; |
| if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
| return -EFAULT; |
| |
| mutex_lock(&xs->mutex); |
| if (xs->state != XSK_READY) { |
| mutex_unlock(&xs->mutex); |
| return -EBUSY; |
| } |
| q = (optname == XDP_TX_RING) ? &xs->tx : &xs->rx; |
| err = xsk_init_queue(entries, q, false); |
| if (!err && optname == XDP_TX_RING) |
| /* Tx needs to be explicitly woken up the first time */ |
| xs->tx->ring->flags |= XDP_RING_NEED_WAKEUP; |
| mutex_unlock(&xs->mutex); |
| return err; |
| } |
| case XDP_UMEM_REG: |
| { |
| size_t mr_size = sizeof(struct xdp_umem_reg); |
| struct xdp_umem_reg mr = {}; |
| struct xdp_umem *umem; |
| |
| if (optlen < sizeof(struct xdp_umem_reg_v1)) |
| return -EINVAL; |
| else if (optlen < sizeof(struct xdp_umem_reg_v2)) |
| mr_size = sizeof(struct xdp_umem_reg_v1); |
| else if (optlen < sizeof(mr)) |
| mr_size = sizeof(struct xdp_umem_reg_v2); |
| |
| if (copy_from_sockptr(&mr, optval, mr_size)) |
| return -EFAULT; |
| |
| mutex_lock(&xs->mutex); |
| if (xs->state != XSK_READY || xs->umem) { |
| mutex_unlock(&xs->mutex); |
| return -EBUSY; |
| } |
| |
| umem = xdp_umem_create(&mr); |
| if (IS_ERR(umem)) { |
| mutex_unlock(&xs->mutex); |
| return PTR_ERR(umem); |
| } |
| |
| /* Make sure umem is ready before it can be seen by others */ |
| smp_wmb(); |
| WRITE_ONCE(xs->umem, umem); |
| mutex_unlock(&xs->mutex); |
| return 0; |
| } |
| case XDP_UMEM_FILL_RING: |
| case XDP_UMEM_COMPLETION_RING: |
| { |
| struct xsk_queue **q; |
| int entries; |
| |
| if (optlen < sizeof(entries)) |
| return -EINVAL; |
| if (copy_from_sockptr(&entries, optval, sizeof(entries))) |
| return -EFAULT; |
| |
| mutex_lock(&xs->mutex); |
| if (xs->state != XSK_READY) { |
| mutex_unlock(&xs->mutex); |
| return -EBUSY; |
| } |
| |
| q = (optname == XDP_UMEM_FILL_RING) ? &xs->fq_tmp : |
| &xs->cq_tmp; |
| err = xsk_init_queue(entries, q, true); |
| mutex_unlock(&xs->mutex); |
| return err; |
| } |
| default: |
| break; |
| } |
| |
| return -ENOPROTOOPT; |
| } |
| |
| static void xsk_enter_rxtx_offsets(struct xdp_ring_offset_v1 *ring) |
| { |
| ring->producer = offsetof(struct xdp_rxtx_ring, ptrs.producer); |
| ring->consumer = offsetof(struct xdp_rxtx_ring, ptrs.consumer); |
| ring->desc = offsetof(struct xdp_rxtx_ring, desc); |
| } |
| |
| static void xsk_enter_umem_offsets(struct xdp_ring_offset_v1 *ring) |
| { |
| ring->producer = offsetof(struct xdp_umem_ring, ptrs.producer); |
| ring->consumer = offsetof(struct xdp_umem_ring, ptrs.consumer); |
| ring->desc = offsetof(struct xdp_umem_ring, desc); |
| } |
| |
| struct xdp_statistics_v1 { |
| __u64 rx_dropped; |
| __u64 rx_invalid_descs; |
| __u64 tx_invalid_descs; |
| }; |
| |
| static int xsk_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct xdp_sock *xs = xdp_sk(sk); |
| int len; |
| |
| if (level != SOL_XDP) |
| return -ENOPROTOOPT; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| if (len < 0) |
| return -EINVAL; |
| |
| switch (optname) { |
| case XDP_STATISTICS: |
| { |
| struct xdp_statistics stats = {}; |
| bool extra_stats = true; |
| size_t stats_size; |
| |
| if (len < sizeof(struct xdp_statistics_v1)) { |
| return -EINVAL; |
| } else if (len < sizeof(stats)) { |
| extra_stats = false; |
| stats_size = sizeof(struct xdp_statistics_v1); |
| } else { |
| stats_size = sizeof(stats); |
| } |
| |
| mutex_lock(&xs->mutex); |
| stats.rx_dropped = xs->rx_dropped; |
| if (extra_stats) { |
| stats.rx_ring_full = xs->rx_queue_full; |
| stats.rx_fill_ring_empty_descs = |
| xs->pool ? xskq_nb_queue_empty_descs(xs->pool->fq) : 0; |
| stats.tx_ring_empty_descs = xskq_nb_queue_empty_descs(xs->tx); |
| } else { |
| stats.rx_dropped += xs->rx_queue_full; |
| } |
| stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx); |
| stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx); |
| mutex_unlock(&xs->mutex); |
| |
| if (copy_to_user(optval, &stats, stats_size)) |
| return -EFAULT; |
| if (put_user(stats_size, optlen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| case XDP_MMAP_OFFSETS: |
| { |
| struct xdp_mmap_offsets off; |
| struct xdp_mmap_offsets_v1 off_v1; |
| bool flags_supported = true; |
| void *to_copy; |
| |
| if (len < sizeof(off_v1)) |
| return -EINVAL; |
| else if (len < sizeof(off)) |
| flags_supported = false; |
| |
| if (flags_supported) { |
| /* xdp_ring_offset is identical to xdp_ring_offset_v1 |
| * except for the flags field added to the end. |
| */ |
| xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) |
| &off.rx); |
| xsk_enter_rxtx_offsets((struct xdp_ring_offset_v1 *) |
| &off.tx); |
| xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) |
| &off.fr); |
| xsk_enter_umem_offsets((struct xdp_ring_offset_v1 *) |
| &off.cr); |
| off.rx.flags = offsetof(struct xdp_rxtx_ring, |
| ptrs.flags); |
| off.tx.flags = offsetof(struct xdp_rxtx_ring, |
| ptrs.flags); |
| off.fr.flags = offsetof(struct xdp_umem_ring, |
| ptrs.flags); |
| off.cr.flags = offsetof(struct xdp_umem_ring, |
| ptrs.flags); |
| |
| len = sizeof(off); |
| to_copy = &off; |
| } else { |
| xsk_enter_rxtx_offsets(&off_v1.rx); |
| xsk_enter_rxtx_offsets(&off_v1.tx); |
| xsk_enter_umem_offsets(&off_v1.fr); |
| xsk_enter_umem_offsets(&off_v1.cr); |
| |
| len = sizeof(off_v1); |
| to_copy = &off_v1; |
| } |
| |
| if (copy_to_user(optval, to_copy, len)) |
| return -EFAULT; |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| case XDP_OPTIONS: |
| { |
| struct xdp_options opts = {}; |
| |
| if (len < sizeof(opts)) |
| return -EINVAL; |
| |
| mutex_lock(&xs->mutex); |
| if (xs->zc) |
| opts.flags |= XDP_OPTIONS_ZEROCOPY; |
| mutex_unlock(&xs->mutex); |
| |
| len = sizeof(opts); |
| if (copy_to_user(optval, &opts, len)) |
| return -EFAULT; |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| |
| return 0; |
| } |
| default: |
| break; |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int xsk_mmap(struct file *file, struct socket *sock, |
| struct vm_area_struct *vma) |
| { |
| loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
| unsigned long size = vma->vm_end - vma->vm_start; |
| struct xdp_sock *xs = xdp_sk(sock->sk); |
| int state = READ_ONCE(xs->state); |
| struct xsk_queue *q = NULL; |
| |
| if (state != XSK_READY && state != XSK_BOUND) |
| return -EBUSY; |
| |
| if (offset == XDP_PGOFF_RX_RING) { |
| q = READ_ONCE(xs->rx); |
| } else if (offset == XDP_PGOFF_TX_RING) { |
| q = READ_ONCE(xs->tx); |
| } else { |
| /* Matches the smp_wmb() in XDP_UMEM_REG */ |
| smp_rmb(); |
| if (offset == XDP_UMEM_PGOFF_FILL_RING) |
| q = state == XSK_READY ? READ_ONCE(xs->fq_tmp) : |
| READ_ONCE(xs->pool->fq); |
| else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING) |
| q = state == XSK_READY ? READ_ONCE(xs->cq_tmp) : |
| READ_ONCE(xs->pool->cq); |
| } |
| |
| if (!q) |
| return -EINVAL; |
| |
| /* Matches the smp_wmb() in xsk_init_queue */ |
| smp_rmb(); |
| if (size > q->ring_vmalloc_size) |
| return -EINVAL; |
| |
| return remap_vmalloc_range(vma, q->ring, 0); |
| } |
| |
| static int xsk_notifier(struct notifier_block *this, |
| unsigned long msg, void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct net *net = dev_net(dev); |
| struct sock *sk; |
| |
| switch (msg) { |
| case NETDEV_UNREGISTER: |
| mutex_lock(&net->xdp.lock); |
| sk_for_each(sk, &net->xdp.list) { |
| struct xdp_sock *xs = xdp_sk(sk); |
| |
| mutex_lock(&xs->mutex); |
| if (xs->dev == dev) { |
| sk->sk_err = ENETDOWN; |
| if (!sock_flag(sk, SOCK_DEAD)) |
| sk_error_report(sk); |
| |
| xsk_unbind_dev(xs); |
| |
| /* Clear device references. */ |
| xp_clear_dev(xs->pool); |
| } |
| mutex_unlock(&xs->mutex); |
| } |
| mutex_unlock(&net->xdp.lock); |
| break; |
| } |
| return NOTIFY_DONE; |
| } |
| |
| static struct proto xsk_proto = { |
| .name = "XDP", |
| .owner = THIS_MODULE, |
| .obj_size = sizeof(struct xdp_sock), |
| }; |
| |
| static const struct proto_ops xsk_proto_ops = { |
| .family = PF_XDP, |
| .owner = THIS_MODULE, |
| .release = xsk_release, |
| .bind = xsk_bind, |
| .connect = sock_no_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = sock_no_getname, |
| .poll = xsk_poll, |
| .ioctl = sock_no_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = sock_no_shutdown, |
| .setsockopt = xsk_setsockopt, |
| .getsockopt = xsk_getsockopt, |
| .sendmsg = xsk_sendmsg, |
| .recvmsg = xsk_recvmsg, |
| .mmap = xsk_mmap, |
| }; |
| |
| static void xsk_destruct(struct sock *sk) |
| { |
| struct xdp_sock *xs = xdp_sk(sk); |
| |
| if (!sock_flag(sk, SOCK_DEAD)) |
| return; |
| |
| if (!xp_put_pool(xs->pool)) |
| xdp_put_umem(xs->umem, !xs->pool); |
| } |
| |
| static int xsk_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct xdp_sock *xs; |
| struct sock *sk; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
| return -EPERM; |
| if (sock->type != SOCK_RAW) |
| return -ESOCKTNOSUPPORT; |
| |
| if (protocol) |
| return -EPROTONOSUPPORT; |
| |
| sock->state = SS_UNCONNECTED; |
| |
| sk = sk_alloc(net, PF_XDP, GFP_KERNEL, &xsk_proto, kern); |
| if (!sk) |
| return -ENOBUFS; |
| |
| sock->ops = &xsk_proto_ops; |
| |
| sock_init_data(sock, sk); |
| |
| sk->sk_family = PF_XDP; |
| |
| sk->sk_destruct = xsk_destruct; |
| |
| sock_set_flag(sk, SOCK_RCU_FREE); |
| |
| xs = xdp_sk(sk); |
| xs->state = XSK_READY; |
| mutex_init(&xs->mutex); |
| spin_lock_init(&xs->rx_lock); |
| |
| INIT_LIST_HEAD(&xs->map_list); |
| spin_lock_init(&xs->map_list_lock); |
| |
| mutex_lock(&net->xdp.lock); |
| sk_add_node_rcu(sk, &net->xdp.list); |
| mutex_unlock(&net->xdp.lock); |
| |
| sock_prot_inuse_add(net, &xsk_proto, 1); |
| |
| return 0; |
| } |
| |
| static const struct net_proto_family xsk_family_ops = { |
| .family = PF_XDP, |
| .create = xsk_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| static struct notifier_block xsk_netdev_notifier = { |
| .notifier_call = xsk_notifier, |
| }; |
| |
| static int __net_init xsk_net_init(struct net *net) |
| { |
| mutex_init(&net->xdp.lock); |
| INIT_HLIST_HEAD(&net->xdp.list); |
| return 0; |
| } |
| |
| static void __net_exit xsk_net_exit(struct net *net) |
| { |
| WARN_ON_ONCE(!hlist_empty(&net->xdp.list)); |
| } |
| |
| static struct pernet_operations xsk_net_ops = { |
| .init = xsk_net_init, |
| .exit = xsk_net_exit, |
| }; |
| |
| static int __init xsk_init(void) |
| { |
| int err; |
| |
| err = proto_register(&xsk_proto, 0 /* no slab */); |
| if (err) |
| goto out; |
| |
| err = sock_register(&xsk_family_ops); |
| if (err) |
| goto out_proto; |
| |
| err = register_pernet_subsys(&xsk_net_ops); |
| if (err) |
| goto out_sk; |
| |
| err = register_netdevice_notifier(&xsk_netdev_notifier); |
| if (err) |
| goto out_pernet; |
| |
| return 0; |
| |
| out_pernet: |
| unregister_pernet_subsys(&xsk_net_ops); |
| out_sk: |
| sock_unregister(PF_XDP); |
| out_proto: |
| proto_unregister(&xsk_proto); |
| out: |
| return err; |
| } |
| |
| fs_initcall(xsk_init); |