tun/tap: use ptr_ring instead of skb_array
This patch switches to use ptr_ring instead of skb_array. This will be used to enqueue different types of pointers by encoding type into lower bits. Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang
David S. Miller
Родитель
a0ce093180
Коммит
5990a30510
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@ -330,7 +330,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb)
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if (!q)
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return RX_HANDLER_PASS;
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if (__skb_array_full(&q->skb_array))
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if (__ptr_ring_full(&q->ring))
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goto drop;
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skb_push(skb, ETH_HLEN);
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@ -348,7 +348,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb)
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goto drop;
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if (!segs) {
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if (skb_array_produce(&q->skb_array, skb))
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if (ptr_ring_produce(&q->ring, skb))
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goto drop;
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goto wake_up;
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}
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@ -358,7 +358,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb)
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struct sk_buff *nskb = segs->next;
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segs->next = NULL;
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if (skb_array_produce(&q->skb_array, segs)) {
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if (ptr_ring_produce(&q->ring, segs)) {
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kfree_skb(segs);
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kfree_skb_list(nskb);
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break;
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@ -375,7 +375,7 @@ rx_handler_result_t tap_handle_frame(struct sk_buff **pskb)
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!(features & NETIF_F_CSUM_MASK) &&
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skb_checksum_help(skb))
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goto drop;
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if (skb_array_produce(&q->skb_array, skb))
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if (ptr_ring_produce(&q->ring, skb))
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goto drop;
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}
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@ -497,7 +497,7 @@ static void tap_sock_destruct(struct sock *sk)
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{
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struct tap_queue *q = container_of(sk, struct tap_queue, sk);
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skb_array_cleanup(&q->skb_array);
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ptr_ring_cleanup(&q->ring, __skb_array_destroy_skb);
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}
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static int tap_open(struct inode *inode, struct file *file)
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@ -517,7 +517,7 @@ static int tap_open(struct inode *inode, struct file *file)
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&tap_proto, 0);
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if (!q)
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goto err;
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if (skb_array_init(&q->skb_array, tap->dev->tx_queue_len, GFP_KERNEL)) {
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if (ptr_ring_init(&q->ring, tap->dev->tx_queue_len, GFP_KERNEL)) {
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sk_free(&q->sk);
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goto err;
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}
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@ -546,7 +546,7 @@ static int tap_open(struct inode *inode, struct file *file)
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err = tap_set_queue(tap, file, q);
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if (err) {
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/* tap_sock_destruct() will take care of freeing skb_array */
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/* tap_sock_destruct() will take care of freeing ptr_ring */
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goto err_put;
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}
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@ -583,7 +583,7 @@ static unsigned int tap_poll(struct file *file, poll_table *wait)
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mask = 0;
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poll_wait(file, &q->wq.wait, wait);
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if (!skb_array_empty(&q->skb_array))
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if (!ptr_ring_empty(&q->ring))
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mask |= POLLIN | POLLRDNORM;
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if (sock_writeable(&q->sk) ||
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@ -844,7 +844,7 @@ static ssize_t tap_do_read(struct tap_queue *q,
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TASK_INTERRUPTIBLE);
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/* Read frames from the queue */
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skb = skb_array_consume(&q->skb_array);
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skb = ptr_ring_consume(&q->ring);
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if (skb)
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break;
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if (noblock) {
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@ -1176,7 +1176,7 @@ static int tap_peek_len(struct socket *sock)
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{
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struct tap_queue *q = container_of(sock, struct tap_queue,
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sock);
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return skb_array_peek_len(&q->skb_array);
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return PTR_RING_PEEK_CALL(&q->ring, __skb_array_len_with_tag);
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}
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/* Ops structure to mimic raw sockets with tun */
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@ -1202,7 +1202,7 @@ struct socket *tap_get_socket(struct file *file)
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}
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EXPORT_SYMBOL_GPL(tap_get_socket);
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struct skb_array *tap_get_skb_array(struct file *file)
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struct ptr_ring *tap_get_ptr_ring(struct file *file)
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{
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struct tap_queue *q;
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@ -1211,29 +1211,30 @@ struct skb_array *tap_get_skb_array(struct file *file)
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q = file->private_data;
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if (!q)
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return ERR_PTR(-EBADFD);
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return &q->skb_array;
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return &q->ring;
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}
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EXPORT_SYMBOL_GPL(tap_get_skb_array);
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EXPORT_SYMBOL_GPL(tap_get_ptr_ring);
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int tap_queue_resize(struct tap_dev *tap)
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{
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struct net_device *dev = tap->dev;
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struct tap_queue *q;
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struct skb_array **arrays;
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struct ptr_ring **rings;
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int n = tap->numqueues;
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int ret, i = 0;
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arrays = kmalloc_array(n, sizeof(*arrays), GFP_KERNEL);
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if (!arrays)
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rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL);
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if (!rings)
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return -ENOMEM;
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list_for_each_entry(q, &tap->queue_list, next)
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arrays[i++] = &q->skb_array;
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rings[i++] = &q->ring;
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ret = skb_array_resize_multiple(arrays, n,
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dev->tx_queue_len, GFP_KERNEL);
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ret = ptr_ring_resize_multiple(rings, n,
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dev->tx_queue_len, GFP_KERNEL,
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__skb_array_destroy_skb);
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kfree(arrays);
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kfree(rings);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tap_queue_resize);
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@ -179,7 +179,7 @@ struct tun_file {
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struct mutex napi_mutex; /* Protects access to the above napi */
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struct list_head next;
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struct tun_struct *detached;
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struct skb_array tx_array;
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struct ptr_ring tx_ring;
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struct xdp_rxq_info xdp_rxq;
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};
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@ -635,7 +635,7 @@ static void tun_queue_purge(struct tun_file *tfile)
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{
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struct sk_buff *skb;
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while ((skb = skb_array_consume(&tfile->tx_array)) != NULL)
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while ((skb = ptr_ring_consume(&tfile->tx_ring)) != NULL)
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kfree_skb(skb);
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skb_queue_purge(&tfile->sk.sk_write_queue);
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@ -689,7 +689,8 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
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unregister_netdevice(tun->dev);
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}
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if (tun) {
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skb_array_cleanup(&tfile->tx_array);
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ptr_ring_cleanup(&tfile->tx_ring,
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__skb_array_destroy_skb);
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xdp_rxq_info_unreg(&tfile->xdp_rxq);
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}
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sock_put(&tfile->sk);
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@ -782,7 +783,7 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
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}
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if (!tfile->detached &&
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skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) {
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ptr_ring_init(&tfile->tx_ring, dev->tx_queue_len, GFP_KERNEL)) {
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err = -ENOMEM;
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goto out;
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}
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@ -1048,7 +1049,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
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nf_reset(skb);
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if (skb_array_produce(&tfile->tx_array, skb))
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if (ptr_ring_produce(&tfile->tx_ring, skb))
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goto drop;
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/* Notify and wake up reader process */
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@ -1316,7 +1317,7 @@ static unsigned int tun_chr_poll(struct file *file, poll_table *wait)
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poll_wait(file, sk_sleep(sk), wait);
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if (!skb_array_empty(&tfile->tx_array))
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if (!ptr_ring_empty(&tfile->tx_ring))
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mask |= POLLIN | POLLRDNORM;
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if (tun->dev->flags & IFF_UP &&
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@ -1966,7 +1967,7 @@ static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock,
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struct sk_buff *skb = NULL;
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int error = 0;
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skb = skb_array_consume(&tfile->tx_array);
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skb = ptr_ring_consume(&tfile->tx_ring);
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if (skb)
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goto out;
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if (noblock) {
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@ -1978,7 +1979,7 @@ static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock,
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current->state = TASK_INTERRUPTIBLE;
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while (1) {
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skb = skb_array_consume(&tfile->tx_array);
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skb = ptr_ring_consume(&tfile->tx_ring);
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if (skb)
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break;
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if (signal_pending(current)) {
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@ -2208,7 +2209,7 @@ static int tun_peek_len(struct socket *sock)
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if (!tun)
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return 0;
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ret = skb_array_peek_len(&tfile->tx_array);
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ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, __skb_array_len_with_tag);
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tun_put(tun);
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return ret;
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@ -3114,25 +3115,26 @@ static int tun_queue_resize(struct tun_struct *tun)
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{
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struct net_device *dev = tun->dev;
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struct tun_file *tfile;
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struct skb_array **arrays;
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struct ptr_ring **rings;
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int n = tun->numqueues + tun->numdisabled;
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int ret, i;
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arrays = kmalloc_array(n, sizeof(*arrays), GFP_KERNEL);
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if (!arrays)
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rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL);
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if (!rings)
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return -ENOMEM;
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for (i = 0; i < tun->numqueues; i++) {
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tfile = rtnl_dereference(tun->tfiles[i]);
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arrays[i] = &tfile->tx_array;
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rings[i] = &tfile->tx_ring;
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}
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list_for_each_entry(tfile, &tun->disabled, next)
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arrays[i++] = &tfile->tx_array;
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rings[i++] = &tfile->tx_ring;
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ret = skb_array_resize_multiple(arrays, n,
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dev->tx_queue_len, GFP_KERNEL);
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ret = ptr_ring_resize_multiple(rings, n,
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dev->tx_queue_len, GFP_KERNEL,
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__skb_array_destroy_skb);
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kfree(arrays);
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kfree(rings);
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return ret;
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}
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@ -3218,7 +3220,7 @@ struct socket *tun_get_socket(struct file *file)
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}
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EXPORT_SYMBOL_GPL(tun_get_socket);
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struct skb_array *tun_get_skb_array(struct file *file)
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struct ptr_ring *tun_get_tx_ring(struct file *file)
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{
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struct tun_file *tfile;
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@ -3227,9 +3229,9 @@ struct skb_array *tun_get_skb_array(struct file *file)
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tfile = file->private_data;
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if (!tfile)
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return ERR_PTR(-EBADFD);
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return &tfile->tx_array;
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return &tfile->tx_ring;
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}
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EXPORT_SYMBOL_GPL(tun_get_skb_array);
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EXPORT_SYMBOL_GPL(tun_get_tx_ring);
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module_init(tun_init);
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module_exit(tun_cleanup);
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@ -89,7 +89,7 @@ struct vhost_net_ubuf_ref {
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#define VHOST_RX_BATCH 64
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struct vhost_net_buf {
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struct sk_buff **queue;
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void **queue;
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int tail;
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int head;
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};
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@ -108,7 +108,7 @@ struct vhost_net_virtqueue {
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/* Reference counting for outstanding ubufs.
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* Protected by vq mutex. Writers must also take device mutex. */
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struct vhost_net_ubuf_ref *ubufs;
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struct skb_array *rx_array;
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struct ptr_ring *rx_ring;
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struct vhost_net_buf rxq;
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};
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@ -158,7 +158,7 @@ static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq)
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struct vhost_net_buf *rxq = &nvq->rxq;
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rxq->head = 0;
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rxq->tail = skb_array_consume_batched(nvq->rx_array, rxq->queue,
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rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue,
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VHOST_RX_BATCH);
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return rxq->tail;
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}
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@ -167,9 +167,10 @@ static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq)
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{
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struct vhost_net_buf *rxq = &nvq->rxq;
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if (nvq->rx_array && !vhost_net_buf_is_empty(rxq)) {
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skb_array_unconsume(nvq->rx_array, rxq->queue + rxq->head,
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vhost_net_buf_get_size(rxq));
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if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) {
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ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head,
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vhost_net_buf_get_size(rxq),
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__skb_array_destroy_skb);
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rxq->head = rxq->tail = 0;
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}
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}
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@ -583,7 +584,7 @@ static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk)
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int len = 0;
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unsigned long flags;
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if (rvq->rx_array)
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if (rvq->rx_ring)
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return vhost_net_buf_peek(rvq);
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|
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spin_lock_irqsave(&sk->sk_receive_queue.lock, flags);
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@ -790,7 +791,7 @@ static void handle_rx(struct vhost_net *net)
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* they refilled. */
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goto out;
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}
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if (nvq->rx_array)
|
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if (nvq->rx_ring)
|
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msg.msg_control = vhost_net_buf_consume(&nvq->rxq);
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/* On overrun, truncate and discard */
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if (unlikely(headcount > UIO_MAXIOV)) {
|
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|
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@ -896,7 +897,7 @@ static int vhost_net_open(struct inode *inode, struct file *f)
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struct vhost_net *n;
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struct vhost_dev *dev;
|
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struct vhost_virtqueue **vqs;
|
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struct sk_buff **queue;
|
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void **queue;
|
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int i;
|
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|
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n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
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|
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@ -908,7 +909,7 @@ static int vhost_net_open(struct inode *inode, struct file *f)
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return -ENOMEM;
|
||||
}
|
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|
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queue = kmalloc_array(VHOST_RX_BATCH, sizeof(struct sk_buff *),
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queue = kmalloc_array(VHOST_RX_BATCH, sizeof(void *),
|
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GFP_KERNEL);
|
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if (!queue) {
|
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kfree(vqs);
|
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|
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@ -1046,23 +1047,23 @@ err:
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return ERR_PTR(r);
|
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}
|
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|
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static struct skb_array *get_tap_skb_array(int fd)
|
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static struct ptr_ring *get_tap_ptr_ring(int fd)
|
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{
|
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struct skb_array *array;
|
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struct ptr_ring *ring;
|
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struct file *file = fget(fd);
|
||||
|
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if (!file)
|
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return NULL;
|
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array = tun_get_skb_array(file);
|
||||
if (!IS_ERR(array))
|
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ring = tun_get_tx_ring(file);
|
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if (!IS_ERR(ring))
|
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goto out;
|
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array = tap_get_skb_array(file);
|
||||
if (!IS_ERR(array))
|
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ring = tap_get_ptr_ring(file);
|
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if (!IS_ERR(ring))
|
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goto out;
|
||||
array = NULL;
|
||||
ring = NULL;
|
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out:
|
||||
fput(file);
|
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return array;
|
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return ring;
|
||||
}
|
||||
|
||||
static struct socket *get_tap_socket(int fd)
|
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|
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@ -1143,7 +1144,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
|
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vq->private_data = sock;
|
||||
vhost_net_buf_unproduce(nvq);
|
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if (index == VHOST_NET_VQ_RX)
|
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nvq->rx_array = get_tap_skb_array(fd);
|
||||
nvq->rx_ring = get_tap_ptr_ring(fd);
|
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r = vhost_vq_init_access(vq);
|
||||
if (r)
|
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goto err_used;
|
||||
|
|
|
|||
|
|
@ -4,7 +4,7 @@
|
|||
|
||||
#if IS_ENABLED(CONFIG_TAP)
|
||||
struct socket *tap_get_socket(struct file *);
|
||||
struct skb_array *tap_get_skb_array(struct file *file);
|
||||
struct ptr_ring *tap_get_ptr_ring(struct file *file);
|
||||
#else
|
||||
#include <linux/err.h>
|
||||
#include <linux/errno.h>
|
||||
|
|
@ -14,7 +14,7 @@ static inline struct socket *tap_get_socket(struct file *f)
|
|||
{
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
static inline struct skb_array *tap_get_skb_array(struct file *f)
|
||||
static inline struct ptr_ring *tap_get_ptr_ring(struct file *f)
|
||||
{
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
|
@ -70,7 +70,7 @@ struct tap_queue {
|
|||
u16 queue_index;
|
||||
bool enabled;
|
||||
struct list_head next;
|
||||
struct skb_array skb_array;
|
||||
struct ptr_ring ring;
|
||||
};
|
||||
|
||||
rx_handler_result_t tap_handle_frame(struct sk_buff **pskb);
|
||||
|
|
|
|||
|
|
@ -19,7 +19,7 @@
|
|||
|
||||
#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
|
||||
struct socket *tun_get_socket(struct file *);
|
||||
struct skb_array *tun_get_skb_array(struct file *file);
|
||||
struct ptr_ring *tun_get_tx_ring(struct file *file);
|
||||
#else
|
||||
#include <linux/err.h>
|
||||
#include <linux/errno.h>
|
||||
|
|
@ -29,7 +29,7 @@ static inline struct socket *tun_get_socket(struct file *f)
|
|||
{
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
static inline struct skb_array *tun_get_skb_array(struct file *f)
|
||||
static inline struct ptr_ring *tun_get_tx_ring(struct file *f)
|
||||
{
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
|
|
|||
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