CC'ing virtio-dev@lists.oasis-open.org On Mon, Aug 15, 2022 at 10:56:04AM -0700, Bobby Eshleman wrote: > This patch replaces virtio_vsock_pkt with sk_buff. > > The benefit of this series includes: > > * The bug reported @ https://bugzilla.redhat.com/show_bug.cgi?id=2009935 > does not present itself when reasonable sk_sndbuf thresholds are set. > * Using sock_alloc_send_skb() teaches VSOCK to respect > sk_sndbuf for tunability. > * Eliminates copying for vsock_deliver_tap(). > * sk_buff is required for future improvements, such as using socket map. > > Signed-off-by: Bobby Eshleman <bobby.eshle...@bytedance.com> > --- > drivers/vhost/vsock.c | 214 +++++------ > include/linux/virtio_vsock.h | 60 ++- > net/vmw_vsock/af_vsock.c | 1 + > net/vmw_vsock/virtio_transport.c | 212 +++++----- > net/vmw_vsock/virtio_transport_common.c | 491 ++++++++++++------------ > net/vmw_vsock/vsock_loopback.c | 51 +-- > 6 files changed, 517 insertions(+), 512 deletions(-) > > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c > index 368330417bde..f8601d93d94d 100644 > --- a/drivers/vhost/vsock.c > +++ b/drivers/vhost/vsock.c > @@ -51,8 +51,7 @@ struct vhost_vsock { > struct hlist_node hash; > > struct vhost_work send_pkt_work; > - spinlock_t send_pkt_list_lock; > - struct list_head send_pkt_list; /* host->guest pending packets */ > + struct sk_buff_head send_pkt_queue; /* host->guest pending packets */ > > atomic_t queued_replies; > > @@ -108,7 +107,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > vhost_disable_notify(&vsock->dev, vq); > > do { > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > + struct virtio_vsock_hdr *hdr; > struct iov_iter iov_iter; > unsigned out, in; > size_t nbytes; > @@ -116,31 +116,22 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > int head; > u32 flags_to_restore = 0; > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - if (list_empty(&vsock->send_pkt_list)) { > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb = skb_dequeue(&vsock->send_pkt_queue); > + > + if (!skb) { > vhost_enable_notify(&vsock->dev, vq); > break; > } > > - pkt = list_first_entry(&vsock->send_pkt_list, > - struct virtio_vsock_pkt, list); > - list_del_init(&pkt->list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), > &out, &in, NULL, NULL); > if (head < 0) { > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb_queue_head(&vsock->send_pkt_queue, skb); > break; > } > > if (head == vq->num) { > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb_queue_head(&vsock->send_pkt_queue, skb); > > /* We cannot finish yet if more buffers snuck in while > * re-enabling notify. > @@ -153,26 +144,27 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > } > > if (out) { > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > vq_err(vq, "Expected 0 output buffers, got %u\n", out); > break; > } > > iov_len = iov_length(&vq->iov[out], in); > - if (iov_len < sizeof(pkt->hdr)) { > - virtio_transport_free_pkt(pkt); > + if (iov_len < sizeof(*hdr)) { > + kfree_skb(skb); > vq_err(vq, "Buffer len [%zu] too small\n", iov_len); > break; > } > > iov_iter_init(&iov_iter, READ, &vq->iov[out], in, iov_len); > - payload_len = pkt->len - pkt->off; > + payload_len = skb->len - vsock_metadata(skb)->off; > + hdr = vsock_hdr(skb); > > /* If the packet is greater than the space available in the > * buffer, we split it using multiple buffers. > */ > - if (payload_len > iov_len - sizeof(pkt->hdr)) { > - payload_len = iov_len - sizeof(pkt->hdr); > + if (payload_len > iov_len - sizeof(*hdr)) { > + payload_len = iov_len - sizeof(*hdr); > > /* As we are copying pieces of large packet's buffer to > * small rx buffers, headers of packets in rx queue are > @@ -185,31 +177,31 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > * bits set. After initialized header will be copied to > * rx buffer, these required bits will be restored. > */ > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) > { > - pkt->hdr.flags &= > ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM) { > + hdr->flags &= > ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); > flags_to_restore |= VIRTIO_VSOCK_SEQ_EOM; > > - if (le32_to_cpu(pkt->hdr.flags) & > VIRTIO_VSOCK_SEQ_EOR) { > - pkt->hdr.flags &= > ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); > + if (le32_to_cpu(hdr->flags) & > VIRTIO_VSOCK_SEQ_EOR) { > + hdr->flags &= > ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); > flags_to_restore |= > VIRTIO_VSOCK_SEQ_EOR; > } > } > } > > /* Set the correct length in the header */ > - pkt->hdr.len = cpu_to_le32(payload_len); > + hdr->len = cpu_to_le32(payload_len); > > - nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); > - if (nbytes != sizeof(pkt->hdr)) { > - virtio_transport_free_pkt(pkt); > + nbytes = copy_to_iter(hdr, sizeof(*hdr), &iov_iter); > + if (nbytes != sizeof(*hdr)) { > + kfree_skb(skb); > vq_err(vq, "Faulted on copying pkt hdr\n"); > break; > } > > - nbytes = copy_to_iter(pkt->buf + pkt->off, payload_len, > + nbytes = copy_to_iter(skb->data + vsock_metadata(skb)->off, > payload_len, > &iov_iter); > if (nbytes != payload_len) { > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > vq_err(vq, "Faulted on copying pkt buf\n"); > break; > } > @@ -217,31 +209,28 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > /* Deliver to monitoring devices all packets that we > * will transmit. > */ > - virtio_transport_deliver_tap_pkt(pkt); > + virtio_transport_deliver_tap_pkt(skb); > > - vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len); > + vhost_add_used(vq, head, sizeof(*hdr) + payload_len); > added = true; > > - pkt->off += payload_len; > + vsock_metadata(skb)->off += payload_len; > total_len += payload_len; > > /* If we didn't send all the payload we can requeue the packet > * to send it with the next available buffer. > */ > - if (pkt->off < pkt->len) { > - pkt->hdr.flags |= cpu_to_le32(flags_to_restore); > + if (vsock_metadata(skb)->off < skb->len) { > + hdr->flags |= cpu_to_le32(flags_to_restore); > > - /* We are queueing the same virtio_vsock_pkt to handle > + /* We are queueing the same skb to handle > * the remaining bytes, and we want to deliver it > * to monitoring devices in the next iteration. > */ > - pkt->tap_delivered = false; > - > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + vsock_metadata(skb)->flags &= > ~VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED; > + skb_queue_head(&vsock->send_pkt_queue, skb); > } else { > - if (pkt->reply) { > + if (vsock_metadata(skb)->flags & > VIRTIO_VSOCK_METADATA_FLAGS_REPLY) { > int val; > > val = atomic_dec_return(&vsock->queued_replies); > @@ -253,7 +242,7 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, > restart_tx = true; > } > > - virtio_transport_free_pkt(pkt); > + consume_skb(skb); > } > } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); > if (added) > @@ -278,28 +267,26 @@ static void vhost_transport_send_pkt_work(struct > vhost_work *work) > } > > static int > -vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) > +vhost_transport_send_pkt(struct sk_buff *skb) > { > struct vhost_vsock *vsock; > - int len = pkt->len; > + int len = skb->len; > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > > rcu_read_lock(); > > /* Find the vhost_vsock according to guest context id */ > - vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); > + vsock = vhost_vsock_get(le64_to_cpu(hdr->dst_cid)); > if (!vsock) { > rcu_read_unlock(); > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > return -ENODEV; > } > > - if (pkt->reply) > + if (vsock_metadata(skb)->flags & VIRTIO_VSOCK_METADATA_FLAGS_REPLY) > atomic_inc(&vsock->queued_replies); > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add_tail(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > + skb_queue_tail(&vsock->send_pkt_queue, skb); > vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); > > rcu_read_unlock(); > @@ -310,10 +297,8 @@ static int > vhost_transport_cancel_pkt(struct vsock_sock *vsk) > { > struct vhost_vsock *vsock; > - struct virtio_vsock_pkt *pkt, *n; > int cnt = 0; > int ret = -ENODEV; > - LIST_HEAD(freeme); > > rcu_read_lock(); > > @@ -322,20 +307,7 @@ vhost_transport_cancel_pkt(struct vsock_sock *vsk) > if (!vsock) > goto out; > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { > - if (pkt->vsk != vsk) > - continue; > - list_move(&pkt->list, &freeme); > - } > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > - list_for_each_entry_safe(pkt, n, &freeme, list) { > - if (pkt->reply) > - cnt++; > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > + cnt = virtio_transport_purge_skbs(vsk, &vsock->send_pkt_queue); > > if (cnt) { > struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; > @@ -352,11 +324,12 @@ vhost_transport_cancel_pkt(struct vsock_sock *vsk) > return ret; > } > > -static struct virtio_vsock_pkt * > -vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, > +static struct sk_buff * > +vhost_vsock_alloc_skb(struct vhost_virtqueue *vq, > unsigned int out, unsigned int in) > { > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > + struct virtio_vsock_hdr *hdr; > struct iov_iter iov_iter; > size_t nbytes; > size_t len; > @@ -366,50 +339,49 @@ vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, > return NULL; > } > > - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); > - if (!pkt) > + len = iov_length(vq->iov, out); > + > + /* len contains both payload and hdr, so only add additional space for > metadata */ > + skb = alloc_skb(len + sizeof(struct virtio_vsock_metadata), GFP_KERNEL); > + if (!skb) > return NULL; > > - len = iov_length(vq->iov, out); > + memset(skb->head, 0, sizeof(struct virtio_vsock_metadata)); > + virtio_vsock_skb_reserve(skb); > iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); > > - nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); > - if (nbytes != sizeof(pkt->hdr)) { > + hdr = vsock_hdr(skb); > + nbytes = copy_from_iter(hdr, sizeof(*hdr), &iov_iter); > + if (nbytes != sizeof(*hdr)) { > vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", > - sizeof(pkt->hdr), nbytes); > - kfree(pkt); > + sizeof(*hdr), nbytes); > + kfree_skb(skb); > return NULL; > } > > - pkt->len = le32_to_cpu(pkt->hdr.len); > + len = le32_to_cpu(hdr->len); > > /* No payload */ > - if (!pkt->len) > - return pkt; > + if (!len) > + return skb; > > /* The pkt is too big */ > - if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { > - kfree(pkt); > + if (len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { > + kfree_skb(skb); > return NULL; > } > > - pkt->buf = kmalloc(pkt->len, GFP_KERNEL); > - if (!pkt->buf) { > - kfree(pkt); > - return NULL; > - } > + virtio_vsock_skb_rx_put(skb); > > - pkt->buf_len = pkt->len; > - > - nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); > - if (nbytes != pkt->len) { > - vq_err(vq, "Expected %u byte payload, got %zu bytes\n", > - pkt->len, nbytes); > - virtio_transport_free_pkt(pkt); > + nbytes = copy_from_iter(skb->data, len, &iov_iter); > + if (nbytes != len) { > + vq_err(vq, "Expected %zu byte payload, got %zu bytes\n", > + len, nbytes); > + kfree_skb(skb); > return NULL; > } > > - return pkt; > + return skb; > } > > /* Is there space left for replies to rx packets? */ > @@ -496,7 +468,7 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work > *work) > poll.work); > struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, > dev); > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > int head, pkts = 0, total_len = 0; > unsigned int out, in; > bool added = false; > @@ -511,6 +483,9 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work > *work) > > vhost_disable_notify(&vsock->dev, vq); > do { > + struct virtio_vsock_hdr *hdr; > + u32 len; > + > if (!vhost_vsock_more_replies(vsock)) { > /* Stop tx until the device processes already > * pending replies. Leave tx virtqueue > @@ -532,26 +507,29 @@ static void vhost_vsock_handle_tx_kick(struct > vhost_work *work) > break; > } > > - pkt = vhost_vsock_alloc_pkt(vq, out, in); > - if (!pkt) { > - vq_err(vq, "Faulted on pkt\n"); > + skb = vhost_vsock_alloc_skb(vq, out, in); > + if (!skb) > continue; > - } > > - total_len += sizeof(pkt->hdr) + pkt->len; > + len = skb->len; > > /* Deliver to monitoring devices all received packets */ > - virtio_transport_deliver_tap_pkt(pkt); > + virtio_transport_deliver_tap_pkt(skb); > + > + hdr = vsock_hdr(skb); > > /* Only accept correctly addressed packets */ > - if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid && > - le64_to_cpu(pkt->hdr.dst_cid) == > + if (le64_to_cpu(hdr->src_cid) == vsock->guest_cid && > + le64_to_cpu(hdr->dst_cid) == > vhost_transport_get_local_cid()) > - virtio_transport_recv_pkt(&vhost_transport, pkt); > + virtio_transport_recv_pkt(&vhost_transport, skb); > else > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > + > > - vhost_add_used(vq, head, 0); > + len += sizeof(*hdr); > + vhost_add_used(vq, head, len); > + total_len += len; > added = true; > } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); > > @@ -693,8 +671,7 @@ static int vhost_vsock_dev_open(struct inode *inode, > struct file *file) > VHOST_VSOCK_WEIGHT, true, NULL); > > file->private_data = vsock; > - spin_lock_init(&vsock->send_pkt_list_lock); > - INIT_LIST_HEAD(&vsock->send_pkt_list); > + skb_queue_head_init(&vsock->send_pkt_queue); > vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); > return 0; > > @@ -760,16 +737,7 @@ static int vhost_vsock_dev_release(struct inode *inode, > struct file *file) > vhost_vsock_flush(vsock); > vhost_dev_stop(&vsock->dev); > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - while (!list_empty(&vsock->send_pkt_list)) { > - struct virtio_vsock_pkt *pkt; > - > - pkt = list_first_entry(&vsock->send_pkt_list, > - struct virtio_vsock_pkt, list); > - list_del_init(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb_queue_purge(&vsock->send_pkt_queue); > > vhost_dev_cleanup(&vsock->dev); > kfree(vsock->dev.vqs); > diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h > index 35d7eedb5e8e..17ed01466875 100644 > --- a/include/linux/virtio_vsock.h > +++ b/include/linux/virtio_vsock.h > @@ -4,9 +4,43 @@ > > #include <uapi/linux/virtio_vsock.h> > #include <linux/socket.h> > +#include <vdso/bits.h> > #include <net/sock.h> > #include <net/af_vsock.h> > > +enum virtio_vsock_metadata_flags { > + VIRTIO_VSOCK_METADATA_FLAGS_REPLY = BIT(0), > + VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED = BIT(1), > +}; > + > +/* Used only by the virtio/vhost vsock drivers, not related to protocol */ > +struct virtio_vsock_metadata { > + size_t off; > + enum virtio_vsock_metadata_flags flags; > +}; > + > +#define vsock_hdr(skb) \ > + ((struct virtio_vsock_hdr *) \ > + ((void *)skb->head + sizeof(struct virtio_vsock_metadata))) > + > +#define vsock_metadata(skb) \ > + ((struct virtio_vsock_metadata *)skb->head) > + > +#define virtio_vsock_skb_reserve(skb) \ > + skb_reserve(skb, \ > + sizeof(struct virtio_vsock_metadata) + \ > + sizeof(struct virtio_vsock_hdr)) > + > +static inline void virtio_vsock_skb_rx_put(struct sk_buff *skb) > +{ > + u32 len; > + > + len = le32_to_cpu(vsock_hdr(skb)->len); > + > + if (len > 0) > + skb_put(skb, len); > +} > + > #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) > #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL > #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) > @@ -35,23 +69,10 @@ struct virtio_vsock_sock { > u32 last_fwd_cnt; > u32 rx_bytes; > u32 buf_alloc; > - struct list_head rx_queue; > + struct sk_buff_head rx_queue; > u32 msg_count; > }; > > -struct virtio_vsock_pkt { > - struct virtio_vsock_hdr hdr; > - struct list_head list; > - /* socket refcnt not held, only use for cancellation */ > - struct vsock_sock *vsk; > - void *buf; > - u32 buf_len; > - u32 len; > - u32 off; > - bool reply; > - bool tap_delivered; > -}; > - > struct virtio_vsock_pkt_info { > u32 remote_cid, remote_port; > struct vsock_sock *vsk; > @@ -68,7 +89,7 @@ struct virtio_transport { > struct vsock_transport transport; > > /* Takes ownership of the packet */ > - int (*send_pkt)(struct virtio_vsock_pkt *pkt); > + int (*send_pkt)(struct sk_buff *skb); > }; > > ssize_t > @@ -149,11 +170,10 @@ virtio_transport_dgram_enqueue(struct vsock_sock *vsk, > void virtio_transport_destruct(struct vsock_sock *vsk); > > void virtio_transport_recv_pkt(struct virtio_transport *t, > - struct virtio_vsock_pkt *pkt); > -void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); > -void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct > virtio_vsock_pkt *pkt); > + struct sk_buff *skb); > +void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct > sk_buff *skb); > u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); > void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); > -void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); > - > +void virtio_transport_deliver_tap_pkt(struct sk_buff *skb); > +int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *queue); > #endif /* _LINUX_VIRTIO_VSOCK_H */ > diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c > index f04abf662ec6..e348b2d09eac 100644 > --- a/net/vmw_vsock/af_vsock.c > +++ b/net/vmw_vsock/af_vsock.c > @@ -748,6 +748,7 @@ static struct sock *__vsock_create(struct net *net, > vsock_addr_init(&vsk->local_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); > vsock_addr_init(&vsk->remote_addr, VMADDR_CID_ANY, VMADDR_PORT_ANY); > > + sk->sk_allocation = GFP_KERNEL; > sk->sk_destruct = vsock_sk_destruct; > sk->sk_backlog_rcv = vsock_queue_rcv_skb; > sock_reset_flag(sk, SOCK_DONE); > diff --git a/net/vmw_vsock/virtio_transport.c > b/net/vmw_vsock/virtio_transport.c > index ad64f403536a..3bb293fd8607 100644 > --- a/net/vmw_vsock/virtio_transport.c > +++ b/net/vmw_vsock/virtio_transport.c > @@ -21,6 +21,12 @@ > #include <linux/mutex.h> > #include <net/af_vsock.h> > > +#define VIRTIO_VSOCK_MAX_RX_HDR_PAYLOAD_SIZE \ > + (VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE \ > + - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) \ > + - sizeof(struct virtio_vsock_hdr) \ > + - sizeof(struct virtio_vsock_metadata)) > + > static struct workqueue_struct *virtio_vsock_workqueue; > static struct virtio_vsock __rcu *the_virtio_vsock; > static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */ > @@ -42,8 +48,7 @@ struct virtio_vsock { > bool tx_run; > > struct work_struct send_pkt_work; > - spinlock_t send_pkt_list_lock; > - struct list_head send_pkt_list; > + struct sk_buff_head send_pkt_queue; > > atomic_t queued_replies; > > @@ -101,41 +106,32 @@ virtio_transport_send_pkt_work(struct work_struct *work) > vq = vsock->vqs[VSOCK_VQ_TX]; > > for (;;) { > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > struct scatterlist hdr, buf, *sgs[2]; > int ret, in_sg = 0, out_sg = 0; > bool reply; > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - if (list_empty(&vsock->send_pkt_list)) { > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - break; > - } > + skb = skb_dequeue(&vsock->send_pkt_queue); > > - pkt = list_first_entry(&vsock->send_pkt_list, > - struct virtio_vsock_pkt, list); > - list_del_init(&pkt->list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > - virtio_transport_deliver_tap_pkt(pkt); > + if (!skb) > + break; > > - reply = pkt->reply; > + virtio_transport_deliver_tap_pkt(skb); > + reply = vsock_metadata(skb)->flags & > VIRTIO_VSOCK_METADATA_FLAGS_REPLY; > > - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); > + sg_init_one(&hdr, vsock_hdr(skb), sizeof(*vsock_hdr(skb))); > sgs[out_sg++] = &hdr; > - if (pkt->buf) { > - sg_init_one(&buf, pkt->buf, pkt->len); > + if (skb->len > 0) { > + sg_init_one(&buf, skb->data, skb->len); > sgs[out_sg++] = &buf; > } > > - ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, > GFP_KERNEL); > + ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, skb, > GFP_KERNEL); > /* Usually this means that there is no more space available in > * the vq > */ > if (ret < 0) { > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb_queue_head(&vsock->send_pkt_queue, skb); > break; > } > > @@ -163,33 +159,84 @@ virtio_transport_send_pkt_work(struct work_struct *work) > queue_work(virtio_vsock_workqueue, &vsock->rx_work); > } > > +static inline bool > +virtio_transport_skbs_can_merge(struct sk_buff *old, struct sk_buff *new) > +{ > + return (new->len < GOOD_COPY_LEN && > + skb_tailroom(old) >= new->len && > + vsock_hdr(new)->src_cid == vsock_hdr(old)->src_cid && > + vsock_hdr(new)->dst_cid == vsock_hdr(old)->dst_cid && > + vsock_hdr(new)->src_port == vsock_hdr(old)->src_port && > + vsock_hdr(new)->dst_port == vsock_hdr(old)->dst_port && > + vsock_hdr(new)->type == vsock_hdr(old)->type && > + vsock_hdr(new)->flags == vsock_hdr(old)->flags && > + vsock_hdr(old)->op == VIRTIO_VSOCK_OP_RW && > + vsock_hdr(new)->op == VIRTIO_VSOCK_OP_RW); > +} > + > +/** > + * Merge the two most recent skbs together if possible. > + * > + * Caller must hold the queue lock. > + */ > +static void > +virtio_transport_add_to_queue(struct sk_buff_head *queue, struct sk_buff > *new) > +{ > + struct sk_buff *old; > + > + spin_lock_bh(&queue->lock); > + /* In order to reduce skb memory overhead, we merge new packets with > + * older packets if they pass virtio_transport_skbs_can_merge(). > + */ > + if (skb_queue_empty_lockless(queue)) { > + __skb_queue_tail(queue, new); > + goto out; > + } > + > + old = skb_peek_tail(queue); > + > + if (!virtio_transport_skbs_can_merge(old, new)) { > + __skb_queue_tail(queue, new); > + goto out; > + } > + > + memcpy(skb_put(old, new->len), new->data, new->len); > + vsock_hdr(old)->len = cpu_to_le32(old->len); > + vsock_hdr(old)->buf_alloc = vsock_hdr(new)->buf_alloc; > + vsock_hdr(old)->fwd_cnt = vsock_hdr(new)->fwd_cnt; > + dev_kfree_skb_any(new); > + > +out: > + spin_unlock_bh(&queue->lock); > +} > + > static int > -virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) > +virtio_transport_send_pkt(struct sk_buff *skb) > { > + struct virtio_vsock_hdr *hdr; > struct virtio_vsock *vsock; > - int len = pkt->len; > + int len = skb->len; > + > + hdr = vsock_hdr(skb); > > rcu_read_lock(); > vsock = rcu_dereference(the_virtio_vsock); > if (!vsock) { > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > len = -ENODEV; > goto out_rcu; > } > > - if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) { > - virtio_transport_free_pkt(pkt); > + if (le64_to_cpu(hdr->dst_cid) == vsock->guest_cid) { > + kfree_skb(skb); > len = -ENODEV; > goto out_rcu; > } > > - if (pkt->reply) > + if (vsock_metadata(skb)->flags & VIRTIO_VSOCK_METADATA_FLAGS_REPLY) > atomic_inc(&vsock->queued_replies); > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_add_tail(&pkt->list, &vsock->send_pkt_list); > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > + virtio_transport_add_to_queue(&vsock->send_pkt_queue, skb); > queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); > > out_rcu: > @@ -201,9 +248,7 @@ static int > virtio_transport_cancel_pkt(struct vsock_sock *vsk) > { > struct virtio_vsock *vsock; > - struct virtio_vsock_pkt *pkt, *n; > int cnt = 0, ret; > - LIST_HEAD(freeme); > > rcu_read_lock(); > vsock = rcu_dereference(the_virtio_vsock); > @@ -212,20 +257,7 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk) > goto out_rcu; > } > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { > - if (pkt->vsk != vsk) > - continue; > - list_move(&pkt->list, &freeme); > - } > - spin_unlock_bh(&vsock->send_pkt_list_lock); > - > - list_for_each_entry_safe(pkt, n, &freeme, list) { > - if (pkt->reply) > - cnt++; > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > + cnt = virtio_transport_purge_skbs(vsk, &vsock->send_pkt_queue); > > if (cnt) { > struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; > @@ -246,38 +278,34 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk) > > static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) > { > - int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; > - struct virtio_vsock_pkt *pkt; > - struct scatterlist hdr, buf, *sgs[2]; > + struct scatterlist pkt, *sgs[1]; > struct virtqueue *vq; > int ret; > > vq = vsock->vqs[VSOCK_VQ_RX]; > > do { > - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); > - if (!pkt) > - break; > + struct sk_buff *skb; > + const size_t len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE - > + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); > > - pkt->buf = kmalloc(buf_len, GFP_KERNEL); > - if (!pkt->buf) { > - virtio_transport_free_pkt(pkt); > + skb = alloc_skb(len, GFP_KERNEL); > + if (!skb) > break; > - } > > - pkt->buf_len = buf_len; > - pkt->len = buf_len; > + memset(skb->head, 0, > + sizeof(struct virtio_vsock_metadata) + sizeof(struct > virtio_vsock_hdr)); > > - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); > - sgs[0] = &hdr; > + sg_init_one(&pkt, skb->head + sizeof(struct > virtio_vsock_metadata), > + VIRTIO_VSOCK_MAX_RX_HDR_PAYLOAD_SIZE); > + sgs[0] = &pkt; > > - sg_init_one(&buf, pkt->buf, buf_len); > - sgs[1] = &buf; > - ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL); > - if (ret) { > - virtio_transport_free_pkt(pkt); > + ret = virtqueue_add_sgs(vq, sgs, 0, 1, skb, GFP_KERNEL); > + if (ret < 0) { > + kfree_skb(skb); > break; > } > + > vsock->rx_buf_nr++; > } while (vq->num_free); > if (vsock->rx_buf_nr > vsock->rx_buf_max_nr) > @@ -299,12 +327,12 @@ static void virtio_transport_tx_work(struct work_struct > *work) > goto out; > > do { > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > unsigned int len; > > virtqueue_disable_cb(vq); > - while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { > - virtio_transport_free_pkt(pkt); > + while ((skb = virtqueue_get_buf(vq, &len)) != NULL) { > + consume_skb(skb); > added = true; > } > } while (!virtqueue_enable_cb(vq)); > @@ -529,7 +557,8 @@ static void virtio_transport_rx_work(struct work_struct > *work) > do { > virtqueue_disable_cb(vq); > for (;;) { > - struct virtio_vsock_pkt *pkt; > + struct virtio_vsock_hdr *hdr; > + struct sk_buff *skb; > unsigned int len; > > if (!virtio_transport_more_replies(vsock)) { > @@ -540,23 +569,24 @@ static void virtio_transport_rx_work(struct work_struct > *work) > goto out; > } > > - pkt = virtqueue_get_buf(vq, &len); > - if (!pkt) { > + skb = virtqueue_get_buf(vq, &len); > + if (!skb) > break; > - } > > vsock->rx_buf_nr--; > > /* Drop short/long packets */ > - if (unlikely(len < sizeof(pkt->hdr) || > - len > sizeof(pkt->hdr) + pkt->len)) { > - virtio_transport_free_pkt(pkt); > + if (unlikely(len < sizeof(*hdr) || > + len > > VIRTIO_VSOCK_MAX_RX_HDR_PAYLOAD_SIZE)) { > + kfree_skb(skb); > continue; > } > > - pkt->len = len - sizeof(pkt->hdr); > - virtio_transport_deliver_tap_pkt(pkt); > - virtio_transport_recv_pkt(&virtio_transport, pkt); > + hdr = vsock_hdr(skb); > + virtio_vsock_skb_reserve(skb); > + virtio_vsock_skb_rx_put(skb); > + virtio_transport_deliver_tap_pkt(skb); > + virtio_transport_recv_pkt(&virtio_transport, skb); > } > } while (!virtqueue_enable_cb(vq)); > > @@ -610,7 +640,7 @@ static int virtio_vsock_vqs_init(struct virtio_vsock > *vsock) > static void virtio_vsock_vqs_del(struct virtio_vsock *vsock) > { > struct virtio_device *vdev = vsock->vdev; > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > > /* Reset all connected sockets when the VQs disappear */ > vsock_for_each_connected_socket(&virtio_transport.transport, > @@ -637,23 +667,16 @@ static void virtio_vsock_vqs_del(struct virtio_vsock > *vsock) > virtio_reset_device(vdev); > > mutex_lock(&vsock->rx_lock); > - while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) > - virtio_transport_free_pkt(pkt); > + while ((skb = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) > + kfree_skb(skb); > mutex_unlock(&vsock->rx_lock); > > mutex_lock(&vsock->tx_lock); > - while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) > - virtio_transport_free_pkt(pkt); > + while ((skb = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) > + kfree_skb(skb); > mutex_unlock(&vsock->tx_lock); > > - spin_lock_bh(&vsock->send_pkt_list_lock); > - while (!list_empty(&vsock->send_pkt_list)) { > - pkt = list_first_entry(&vsock->send_pkt_list, > - struct virtio_vsock_pkt, list); > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > - spin_unlock_bh(&vsock->send_pkt_list_lock); > + skb_queue_purge(&vsock->send_pkt_queue); > > /* Delete virtqueues and flush outstanding callbacks if any */ > vdev->config->del_vqs(vdev); > @@ -690,8 +713,7 @@ static int virtio_vsock_probe(struct virtio_device *vdev) > mutex_init(&vsock->tx_lock); > mutex_init(&vsock->rx_lock); > mutex_init(&vsock->event_lock); > - spin_lock_init(&vsock->send_pkt_list_lock); > - INIT_LIST_HEAD(&vsock->send_pkt_list); > + skb_queue_head_init(&vsock->send_pkt_queue); > INIT_WORK(&vsock->rx_work, virtio_transport_rx_work); > INIT_WORK(&vsock->tx_work, virtio_transport_tx_work); > INIT_WORK(&vsock->event_work, virtio_transport_event_work); > diff --git a/net/vmw_vsock/virtio_transport_common.c > b/net/vmw_vsock/virtio_transport_common.c > index ec2c2afbf0d0..920578597bb9 100644 > --- a/net/vmw_vsock/virtio_transport_common.c > +++ b/net/vmw_vsock/virtio_transport_common.c > @@ -37,53 +37,81 @@ virtio_transport_get_ops(struct vsock_sock *vsk) > return container_of(t, struct virtio_transport, transport); > } > > -static struct virtio_vsock_pkt * > -virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info, > +/* Returns a new packet on success, otherwise returns NULL. > + * > + * If NULL is returned, errp is set to a negative errno. > + */ > +static struct sk_buff * > +virtio_transport_alloc_skb(struct virtio_vsock_pkt_info *info, > size_t len, > u32 src_cid, > u32 src_port, > u32 dst_cid, > - u32 dst_port) > + u32 dst_port, > + int *errp) > { > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > + struct virtio_vsock_hdr *hdr; > + void *payload; > + const size_t skb_len = sizeof(*hdr) + sizeof(struct > virtio_vsock_metadata) + len; > int err; > > - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); > - if (!pkt) > - return NULL; > + if (info->vsk) { > + unsigned int msg_flags = info->msg ? info->msg->msg_flags : 0; > + struct sock *sk; > > - pkt->hdr.type = cpu_to_le16(info->type); > - pkt->hdr.op = cpu_to_le16(info->op); > - pkt->hdr.src_cid = cpu_to_le64(src_cid); > - pkt->hdr.dst_cid = cpu_to_le64(dst_cid); > - pkt->hdr.src_port = cpu_to_le32(src_port); > - pkt->hdr.dst_port = cpu_to_le32(dst_port); > - pkt->hdr.flags = cpu_to_le32(info->flags); > - pkt->len = len; > - pkt->hdr.len = cpu_to_le32(len); > - pkt->reply = info->reply; > - pkt->vsk = info->vsk; > + sk = sk_vsock(info->vsk); > + skb = sock_alloc_send_skb(sk, skb_len, > + msg_flags & MSG_DONTWAIT, errp); > > - if (info->msg && len > 0) { > - pkt->buf = kmalloc(len, GFP_KERNEL); > - if (!pkt->buf) > - goto out_pkt; > + if (skb) > + skb->priority = sk->sk_priority; > + } else { > + skb = alloc_skb(skb_len, GFP_KERNEL); > + } > + > + if (!skb) { > + /* If using alloc_skb(), the skb is NULL due to lacking memory. > + * Otherwise, errp is set by sock_alloc_send_skb(). > + */ > + if (!info->vsk) > + *errp = -ENOMEM; > + return NULL; > + } > > - pkt->buf_len = len; > + memset(skb->head, 0, sizeof(*hdr) + sizeof(struct > virtio_vsock_metadata)); > + virtio_vsock_skb_reserve(skb); > + payload = skb_put(skb, len); > > - err = memcpy_from_msg(pkt->buf, info->msg, len); > - if (err) > + hdr = vsock_hdr(skb); > + hdr->type = cpu_to_le16(info->type); > + hdr->op = cpu_to_le16(info->op); > + hdr->src_cid = cpu_to_le64(src_cid); > + hdr->dst_cid = cpu_to_le64(dst_cid); > + hdr->src_port = cpu_to_le32(src_port); > + hdr->dst_port = cpu_to_le32(dst_port); > + hdr->flags = cpu_to_le32(info->flags); > + hdr->len = cpu_to_le32(len); > + > + if (info->msg && len > 0) { > + err = memcpy_from_msg(payload, info->msg, len); > + if (err) { > + *errp = -ENOMEM; > goto out; > + } > > if (msg_data_left(info->msg) == 0 && > info->type == VIRTIO_VSOCK_TYPE_SEQPACKET) { > - pkt->hdr.flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); > + hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM); > > if (info->msg->msg_flags & MSG_EOR) > - pkt->hdr.flags |= > cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); > + hdr->flags |= cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR); > } > } > > + if (info->reply) > + vsock_metadata(skb)->flags |= VIRTIO_VSOCK_METADATA_FLAGS_REPLY; > + > trace_virtio_transport_alloc_pkt(src_cid, src_port, > dst_cid, dst_port, > len, > @@ -91,85 +119,26 @@ virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info > *info, > info->op, > info->flags); > > - return pkt; > + return skb; > > out: > - kfree(pkt->buf); > -out_pkt: > - kfree(pkt); > + kfree_skb(skb); > return NULL; > } > > /* Packet capture */ > static struct sk_buff *virtio_transport_build_skb(void *opaque) > { > - struct virtio_vsock_pkt *pkt = opaque; > - struct af_vsockmon_hdr *hdr; > - struct sk_buff *skb; > - size_t payload_len; > - void *payload_buf; > - > - /* A packet could be split to fit the RX buffer, so we can retrieve > - * the payload length from the header and the buffer pointer taking > - * care of the offset in the original packet. > - */ > - payload_len = le32_to_cpu(pkt->hdr.len); > - payload_buf = pkt->buf + pkt->off; > - > - skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len, > - GFP_ATOMIC); > - if (!skb) > - return NULL; > - > - hdr = skb_put(skb, sizeof(*hdr)); > - > - /* pkt->hdr is little-endian so no need to byteswap here */ > - hdr->src_cid = pkt->hdr.src_cid; > - hdr->src_port = pkt->hdr.src_port; > - hdr->dst_cid = pkt->hdr.dst_cid; > - hdr->dst_port = pkt->hdr.dst_port; > - > - hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO); > - hdr->len = cpu_to_le16(sizeof(pkt->hdr)); > - memset(hdr->reserved, 0, sizeof(hdr->reserved)); > - > - switch (le16_to_cpu(pkt->hdr.op)) { > - case VIRTIO_VSOCK_OP_REQUEST: > - case VIRTIO_VSOCK_OP_RESPONSE: > - hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT); > - break; > - case VIRTIO_VSOCK_OP_RST: > - case VIRTIO_VSOCK_OP_SHUTDOWN: > - hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT); > - break; > - case VIRTIO_VSOCK_OP_RW: > - hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD); > - break; > - case VIRTIO_VSOCK_OP_CREDIT_UPDATE: > - case VIRTIO_VSOCK_OP_CREDIT_REQUEST: > - hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL); > - break; > - default: > - hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN); > - break; > - } > - > - skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr)); > - > - if (payload_len) { > - skb_put_data(skb, payload_buf, payload_len); > - } > - > - return skb; > + return (struct sk_buff *)opaque; > } > > -void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt) > +void virtio_transport_deliver_tap_pkt(struct sk_buff *skb) > { > - if (pkt->tap_delivered) > + if (vsock_metadata(skb)->flags & > VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED) > return; > > - vsock_deliver_tap(virtio_transport_build_skb, pkt); > - pkt->tap_delivered = true; > + vsock_deliver_tap(virtio_transport_build_skb, skb); > + vsock_metadata(skb)->flags |= VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED; > } > EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt); > > @@ -192,8 +161,9 @@ static int virtio_transport_send_pkt_info(struct > vsock_sock *vsk, > u32 src_cid, src_port, dst_cid, dst_port; > const struct virtio_transport *t_ops; > struct virtio_vsock_sock *vvs; > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > u32 pkt_len = info->pkt_len; > + int err; > > info->type = virtio_transport_get_type(sk_vsock(vsk)); > > @@ -224,42 +194,47 @@ static int virtio_transport_send_pkt_info(struct > vsock_sock *vsk, > if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) > return pkt_len; > > - pkt = virtio_transport_alloc_pkt(info, pkt_len, > + skb = virtio_transport_alloc_skb(info, pkt_len, > src_cid, src_port, > - dst_cid, dst_port); > - if (!pkt) { > + dst_cid, dst_port, > + &err); > + if (!skb) { > virtio_transport_put_credit(vvs, pkt_len); > - return -ENOMEM; > + return err; > } > > - virtio_transport_inc_tx_pkt(vvs, pkt); > + virtio_transport_inc_tx_pkt(vvs, skb); > + > + err = t_ops->send_pkt(skb); > > - return t_ops->send_pkt(pkt); > + return err < 0 ? -ENOMEM : err; > } > > static bool virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > - if (vvs->rx_bytes + pkt->len > vvs->buf_alloc) > + if (vvs->rx_bytes + skb->len > vvs->buf_alloc) > return false; > > - vvs->rx_bytes += pkt->len; > + vvs->rx_bytes += skb->len; > return true; > } > > static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > - vvs->rx_bytes -= pkt->len; > - vvs->fwd_cnt += pkt->len; > + vvs->rx_bytes -= skb->len; > + vvs->fwd_cnt += skb->len; > } > > -void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct > virtio_vsock_pkt *pkt) > +void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct > sk_buff *skb) > { > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > + > spin_lock_bh(&vvs->rx_lock); > vvs->last_fwd_cnt = vvs->fwd_cnt; > - pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt); > - pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc); > + hdr->fwd_cnt = cpu_to_le32(vvs->fwd_cnt); > + hdr->buf_alloc = cpu_to_le32(vvs->buf_alloc); > spin_unlock_bh(&vvs->rx_lock); > } > EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt); > @@ -303,29 +278,29 @@ virtio_transport_stream_do_peek(struct vsock_sock *vsk, > size_t len) > { > struct virtio_vsock_sock *vvs = vsk->trans; > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb, *tmp; > size_t bytes, total = 0, off; > int err = -EFAULT; > > spin_lock_bh(&vvs->rx_lock); > > - list_for_each_entry(pkt, &vvs->rx_queue, list) { > - off = pkt->off; > + skb_queue_walk_safe(&vvs->rx_queue, skb, tmp) { > + off = vsock_metadata(skb)->off; > > if (total == len) > break; > > - while (total < len && off < pkt->len) { > + while (total < len && off < skb->len) { > bytes = len - total; > - if (bytes > pkt->len - off) > - bytes = pkt->len - off; > + if (bytes > skb->len - off) > + bytes = skb->len - off; > > /* sk_lock is held by caller so no one else can dequeue. > * Unlock rx_lock since memcpy_to_msg() may sleep. > */ > spin_unlock_bh(&vvs->rx_lock); > > - err = memcpy_to_msg(msg, pkt->buf + off, bytes); > + err = memcpy_to_msg(msg, skb->data + off, bytes); > if (err) > goto out; > > @@ -352,37 +327,40 @@ virtio_transport_stream_do_dequeue(struct vsock_sock > *vsk, > size_t len) > { > struct virtio_vsock_sock *vvs = vsk->trans; > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > size_t bytes, total = 0; > u32 free_space; > int err = -EFAULT; > > spin_lock_bh(&vvs->rx_lock); > - while (total < len && !list_empty(&vvs->rx_queue)) { > - pkt = list_first_entry(&vvs->rx_queue, > - struct virtio_vsock_pkt, list); > + while (total < len && !skb_queue_empty_lockless(&vvs->rx_queue)) { > + skb = __skb_dequeue(&vvs->rx_queue); > > bytes = len - total; > - if (bytes > pkt->len - pkt->off) > - bytes = pkt->len - pkt->off; > + if (bytes > skb->len - vsock_metadata(skb)->off) > + bytes = skb->len - vsock_metadata(skb)->off; > > /* sk_lock is held by caller so no one else can dequeue. > * Unlock rx_lock since memcpy_to_msg() may sleep. > */ > spin_unlock_bh(&vvs->rx_lock); > > - err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes); > + err = memcpy_to_msg(msg, skb->data + vsock_metadata(skb)->off, > bytes); > if (err) > goto out; > > spin_lock_bh(&vvs->rx_lock); > > total += bytes; > - pkt->off += bytes; > - if (pkt->off == pkt->len) { > - virtio_transport_dec_rx_pkt(vvs, pkt); > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > + vsock_metadata(skb)->off += bytes; > + > + WARN_ON(vsock_metadata(skb)->off > skb->len); > + > + if (vsock_metadata(skb)->off == skb->len) { > + virtio_transport_dec_rx_pkt(vvs, skb); > + consume_skb(skb); > + } else { > + __skb_queue_head(&vvs->rx_queue, skb); > } > } > > @@ -414,7 +392,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct > vsock_sock *vsk, > int flags) > { > struct virtio_vsock_sock *vvs = vsk->trans; > - struct virtio_vsock_pkt *pkt; > + struct sk_buff *skb; > int dequeued_len = 0; > size_t user_buf_len = msg_data_left(msg); > bool msg_ready = false; > @@ -427,13 +405,16 @@ static int virtio_transport_seqpacket_do_dequeue(struct > vsock_sock *vsk, > } > > while (!msg_ready) { > - pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, > list); > + struct virtio_vsock_hdr *hdr; > + > + skb = __skb_dequeue(&vvs->rx_queue); > + hdr = vsock_hdr(skb); > > if (dequeued_len >= 0) { > size_t pkt_len; > size_t bytes_to_copy; > > - pkt_len = (size_t)le32_to_cpu(pkt->hdr.len); > + pkt_len = (size_t)le32_to_cpu(hdr->len); > bytes_to_copy = min(user_buf_len, pkt_len); > > if (bytes_to_copy) { > @@ -444,7 +425,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct > vsock_sock *vsk, > */ > spin_unlock_bh(&vvs->rx_lock); > > - err = memcpy_to_msg(msg, pkt->buf, > bytes_to_copy); > + err = memcpy_to_msg(msg, skb->data, > bytes_to_copy); > if (err) { > /* Copy of message failed. Rest of > * fragments will be freed without copy. > @@ -461,17 +442,16 @@ static int virtio_transport_seqpacket_do_dequeue(struct > vsock_sock *vsk, > dequeued_len += pkt_len; > } > > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) { > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM) { > msg_ready = true; > vvs->msg_count--; > > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOR) > msg->msg_flags |= MSG_EOR; > } > > - virtio_transport_dec_rx_pkt(vvs, pkt); > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > + virtio_transport_dec_rx_pkt(vvs, skb); > + kfree_skb(skb); > } > > spin_unlock_bh(&vvs->rx_lock); > @@ -609,7 +589,7 @@ int virtio_transport_do_socket_init(struct vsock_sock > *vsk, > > spin_lock_init(&vvs->rx_lock); > spin_lock_init(&vvs->tx_lock); > - INIT_LIST_HEAD(&vvs->rx_queue); > + skb_queue_head_init(&vvs->rx_queue); > > return 0; > } > @@ -809,16 +789,16 @@ void virtio_transport_destruct(struct vsock_sock *vsk) > EXPORT_SYMBOL_GPL(virtio_transport_destruct); > > static int virtio_transport_reset(struct vsock_sock *vsk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct virtio_vsock_pkt_info info = { > .op = VIRTIO_VSOCK_OP_RST, > - .reply = !!pkt, > + .reply = !!skb, > .vsk = vsk, > }; > > /* Send RST only if the original pkt is not a RST pkt */ > - if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) > + if (skb && le16_to_cpu(vsock_hdr(skb)->op) == VIRTIO_VSOCK_OP_RST) > return 0; > > return virtio_transport_send_pkt_info(vsk, &info); > @@ -828,29 +808,32 @@ static int virtio_transport_reset(struct vsock_sock > *vsk, > * attempt was made to connect to a socket that does not exist. > */ > static int virtio_transport_reset_no_sock(const struct virtio_transport *t, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > - struct virtio_vsock_pkt *reply; > + struct sk_buff *reply; > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > struct virtio_vsock_pkt_info info = { > .op = VIRTIO_VSOCK_OP_RST, > - .type = le16_to_cpu(pkt->hdr.type), > + .type = le16_to_cpu(hdr->type), > .reply = true, > }; > + int err; > > /* Send RST only if the original pkt is not a RST pkt */ > - if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) > + if (le16_to_cpu(hdr->op) == VIRTIO_VSOCK_OP_RST) > return 0; > > - reply = virtio_transport_alloc_pkt(&info, 0, > - le64_to_cpu(pkt->hdr.dst_cid), > - le32_to_cpu(pkt->hdr.dst_port), > - le64_to_cpu(pkt->hdr.src_cid), > - le32_to_cpu(pkt->hdr.src_port)); > + reply = virtio_transport_alloc_skb(&info, 0, > + le64_to_cpu(hdr->dst_cid), > + le32_to_cpu(hdr->dst_port), > + le64_to_cpu(hdr->src_cid), > + le32_to_cpu(hdr->src_port), > + &err); > if (!reply) > - return -ENOMEM; > + return err; > > if (!t) { > - virtio_transport_free_pkt(reply); > + kfree_skb(reply); > return -ENOTCONN; > } > > @@ -861,16 +844,11 @@ static int virtio_transport_reset_no_sock(const struct > virtio_transport *t, > static void virtio_transport_remove_sock(struct vsock_sock *vsk) > { > struct virtio_vsock_sock *vvs = vsk->trans; > - struct virtio_vsock_pkt *pkt, *tmp; > > /* We don't need to take rx_lock, as the socket is closing and we are > * removing it. > */ > - list_for_each_entry_safe(pkt, tmp, &vvs->rx_queue, list) { > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > - > + __skb_queue_purge(&vvs->rx_queue); > vsock_remove_sock(vsk); > } > > @@ -984,13 +962,14 @@ EXPORT_SYMBOL_GPL(virtio_transport_release); > > static int > virtio_transport_recv_connecting(struct sock *sk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct vsock_sock *vsk = vsock_sk(sk); > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > int err; > int skerr; > > - switch (le16_to_cpu(pkt->hdr.op)) { > + switch (le16_to_cpu(hdr->op)) { > case VIRTIO_VSOCK_OP_RESPONSE: > sk->sk_state = TCP_ESTABLISHED; > sk->sk_socket->state = SS_CONNECTED; > @@ -1011,7 +990,7 @@ virtio_transport_recv_connecting(struct sock *sk, > return 0; > > destroy: > - virtio_transport_reset(vsk, pkt); > + virtio_transport_reset(vsk, skb); > sk->sk_state = TCP_CLOSE; > sk->sk_err = skerr; > sk_error_report(sk); > @@ -1020,34 +999,38 @@ virtio_transport_recv_connecting(struct sock *sk, > > static void > virtio_transport_recv_enqueue(struct vsock_sock *vsk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct virtio_vsock_sock *vvs = vsk->trans; > + struct virtio_vsock_hdr *hdr; > bool can_enqueue, free_pkt = false; > + u32 len; > > - pkt->len = le32_to_cpu(pkt->hdr.len); > - pkt->off = 0; > + hdr = vsock_hdr(skb); > + len = le32_to_cpu(hdr->len); > + vsock_metadata(skb)->off = 0; > > spin_lock_bh(&vvs->rx_lock); > > - can_enqueue = virtio_transport_inc_rx_pkt(vvs, pkt); > + can_enqueue = virtio_transport_inc_rx_pkt(vvs, skb); > if (!can_enqueue) { > free_pkt = true; > goto out; > } > > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SEQ_EOM) > vvs->msg_count++; > > /* Try to copy small packets into the buffer of last packet queued, > * to avoid wasting memory queueing the entire buffer with a small > * payload. > */ > - if (pkt->len <= GOOD_COPY_LEN && !list_empty(&vvs->rx_queue)) { > - struct virtio_vsock_pkt *last_pkt; > + if (len <= GOOD_COPY_LEN && !skb_queue_empty_lockless(&vvs->rx_queue)) { > + struct virtio_vsock_hdr *last_hdr; > + struct sk_buff *last_skb; > > - last_pkt = list_last_entry(&vvs->rx_queue, > - struct virtio_vsock_pkt, list); > + last_skb = skb_peek_tail(&vvs->rx_queue); > + last_hdr = vsock_hdr(last_skb); > > /* If there is space in the last packet queued, we copy the > * new packet in its buffer. We avoid this if the last packet > @@ -1055,35 +1038,35 @@ virtio_transport_recv_enqueue(struct vsock_sock *vsk, > * delimiter of SEQPACKET message, so 'pkt' is the first packet > * of a new message. > */ > - if ((pkt->len <= last_pkt->buf_len - last_pkt->len) && > - !(le32_to_cpu(last_pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM)) > { > - memcpy(last_pkt->buf + last_pkt->len, pkt->buf, > - pkt->len); > - last_pkt->len += pkt->len; > + if (skb->len < skb_tailroom(last_skb) && > + !(le32_to_cpu(last_hdr->flags) & VIRTIO_VSOCK_SEQ_EOR) && > + (vsock_hdr(skb)->type != VIRTIO_VSOCK_TYPE_DGRAM)) { > + memcpy(skb_put(last_skb, skb->len), skb->data, > skb->len); > free_pkt = true; > - last_pkt->hdr.flags |= pkt->hdr.flags; > + last_hdr->flags |= hdr->flags; > goto out; > } > } > > - list_add_tail(&pkt->list, &vvs->rx_queue); > + __skb_queue_tail(&vvs->rx_queue, skb); > > out: > spin_unlock_bh(&vvs->rx_lock); > if (free_pkt) > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > } > > static int > virtio_transport_recv_connected(struct sock *sk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct vsock_sock *vsk = vsock_sk(sk); > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > int err = 0; > > - switch (le16_to_cpu(pkt->hdr.op)) { > + switch (le16_to_cpu(hdr->op)) { > case VIRTIO_VSOCK_OP_RW: > - virtio_transport_recv_enqueue(vsk, pkt); > + virtio_transport_recv_enqueue(vsk, skb); > sk->sk_data_ready(sk); > return err; > case VIRTIO_VSOCK_OP_CREDIT_REQUEST: > @@ -1093,18 +1076,17 @@ virtio_transport_recv_connected(struct sock *sk, > sk->sk_write_space(sk); > break; > case VIRTIO_VSOCK_OP_SHUTDOWN: > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV) > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SHUTDOWN_RCV) > vsk->peer_shutdown |= RCV_SHUTDOWN; > - if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND) > + if (le32_to_cpu(hdr->flags) & VIRTIO_VSOCK_SHUTDOWN_SEND) > vsk->peer_shutdown |= SEND_SHUTDOWN; > if (vsk->peer_shutdown == SHUTDOWN_MASK && > vsock_stream_has_data(vsk) <= 0 && > !sock_flag(sk, SOCK_DONE)) { > (void)virtio_transport_reset(vsk, NULL); > - > virtio_transport_do_close(vsk, true); > } > - if (le32_to_cpu(pkt->hdr.flags)) > + if (le32_to_cpu(vsock_hdr(skb)->flags)) > sk->sk_state_change(sk); > break; > case VIRTIO_VSOCK_OP_RST: > @@ -1115,28 +1097,30 @@ virtio_transport_recv_connected(struct sock *sk, > break; > } > > - virtio_transport_free_pkt(pkt); > + kfree_skb(skb); > return err; > } > > static void > virtio_transport_recv_disconnecting(struct sock *sk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct vsock_sock *vsk = vsock_sk(sk); > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > > - if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) > + if (le16_to_cpu(hdr->op) == VIRTIO_VSOCK_OP_RST) > virtio_transport_do_close(vsk, true); > } > > static int > virtio_transport_send_response(struct vsock_sock *vsk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > struct virtio_vsock_pkt_info info = { > .op = VIRTIO_VSOCK_OP_RESPONSE, > - .remote_cid = le64_to_cpu(pkt->hdr.src_cid), > - .remote_port = le32_to_cpu(pkt->hdr.src_port), > + .remote_cid = le64_to_cpu(hdr->src_cid), > + .remote_port = le32_to_cpu(hdr->src_port), > .reply = true, > .vsk = vsk, > }; > @@ -1145,10 +1129,11 @@ virtio_transport_send_response(struct vsock_sock *vsk, > } > > static bool virtio_transport_space_update(struct sock *sk, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct vsock_sock *vsk = vsock_sk(sk); > struct virtio_vsock_sock *vvs = vsk->trans; > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > bool space_available; > > /* Listener sockets are not associated with any transport, so we are > @@ -1161,8 +1146,8 @@ static bool virtio_transport_space_update(struct sock > *sk, > > /* buf_alloc and fwd_cnt is always included in the hdr */ > spin_lock_bh(&vvs->tx_lock); > - vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc); > - vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt); > + vvs->peer_buf_alloc = le32_to_cpu(hdr->buf_alloc); > + vvs->peer_fwd_cnt = le32_to_cpu(hdr->fwd_cnt); > space_available = virtio_transport_has_space(vsk); > spin_unlock_bh(&vvs->tx_lock); > return space_available; > @@ -1170,27 +1155,28 @@ static bool virtio_transport_space_update(struct sock > *sk, > > /* Handle server socket */ > static int > -virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt, > +virtio_transport_recv_listen(struct sock *sk, struct sk_buff *skb, > struct virtio_transport *t) > { > struct vsock_sock *vsk = vsock_sk(sk); > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > struct vsock_sock *vchild; > struct sock *child; > int ret; > > - if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) { > - virtio_transport_reset_no_sock(t, pkt); > + if (le16_to_cpu(hdr->op) != VIRTIO_VSOCK_OP_REQUEST) { > + virtio_transport_reset_no_sock(t, skb); > return -EINVAL; > } > > if (sk_acceptq_is_full(sk)) { > - virtio_transport_reset_no_sock(t, pkt); > + virtio_transport_reset_no_sock(t, skb); > return -ENOMEM; > } > > child = vsock_create_connected(sk); > if (!child) { > - virtio_transport_reset_no_sock(t, pkt); > + virtio_transport_reset_no_sock(t, skb); > return -ENOMEM; > } > > @@ -1201,10 +1187,10 @@ virtio_transport_recv_listen(struct sock *sk, struct > virtio_vsock_pkt *pkt, > child->sk_state = TCP_ESTABLISHED; > > vchild = vsock_sk(child); > - vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid), > - le32_to_cpu(pkt->hdr.dst_port)); > - vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid), > - le32_to_cpu(pkt->hdr.src_port)); > + vsock_addr_init(&vchild->local_addr, le64_to_cpu(hdr->dst_cid), > + le32_to_cpu(hdr->dst_port)); > + vsock_addr_init(&vchild->remote_addr, le64_to_cpu(hdr->src_cid), > + le32_to_cpu(hdr->src_port)); > > ret = vsock_assign_transport(vchild, vsk); > /* Transport assigned (looking at remote_addr) must be the same > @@ -1212,17 +1198,17 @@ virtio_transport_recv_listen(struct sock *sk, struct > virtio_vsock_pkt *pkt, > */ > if (ret || vchild->transport != &t->transport) { > release_sock(child); > - virtio_transport_reset_no_sock(t, pkt); > + virtio_transport_reset_no_sock(t, skb); > sock_put(child); > return ret; > } > > - if (virtio_transport_space_update(child, pkt)) > + if (virtio_transport_space_update(child, skb)) > child->sk_write_space(child); > > vsock_insert_connected(vchild); > vsock_enqueue_accept(sk, child); > - virtio_transport_send_response(vchild, pkt); > + virtio_transport_send_response(vchild, skb); > > release_sock(child); > > @@ -1240,29 +1226,30 @@ static bool virtio_transport_valid_type(u16 type) > * lock. > */ > void virtio_transport_recv_pkt(struct virtio_transport *t, > - struct virtio_vsock_pkt *pkt) > + struct sk_buff *skb) > { > struct sockaddr_vm src, dst; > struct vsock_sock *vsk; > struct sock *sk; > bool space_available; > + struct virtio_vsock_hdr *hdr = vsock_hdr(skb); > > - vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid), > - le32_to_cpu(pkt->hdr.src_port)); > - vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid), > - le32_to_cpu(pkt->hdr.dst_port)); > + vsock_addr_init(&src, le64_to_cpu(hdr->src_cid), > + le32_to_cpu(hdr->src_port)); > + vsock_addr_init(&dst, le64_to_cpu(hdr->dst_cid), > + le32_to_cpu(hdr->dst_port)); > > trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port, > dst.svm_cid, dst.svm_port, > - le32_to_cpu(pkt->hdr.len), > - le16_to_cpu(pkt->hdr.type), > - le16_to_cpu(pkt->hdr.op), > - le32_to_cpu(pkt->hdr.flags), > - le32_to_cpu(pkt->hdr.buf_alloc), > - le32_to_cpu(pkt->hdr.fwd_cnt)); > - > - if (!virtio_transport_valid_type(le16_to_cpu(pkt->hdr.type))) { > - (void)virtio_transport_reset_no_sock(t, pkt); > + le32_to_cpu(hdr->len), > + le16_to_cpu(hdr->type), > + le16_to_cpu(hdr->op), > + le32_to_cpu(hdr->flags), > + le32_to_cpu(hdr->buf_alloc), > + le32_to_cpu(hdr->fwd_cnt)); > + > + if (!virtio_transport_valid_type(le16_to_cpu(hdr->type))) { > + (void)virtio_transport_reset_no_sock(t, skb); > goto free_pkt; > } > > @@ -1273,13 +1260,13 @@ void virtio_transport_recv_pkt(struct > virtio_transport *t, > if (!sk) { > sk = vsock_find_bound_socket(&dst); > if (!sk) { > - (void)virtio_transport_reset_no_sock(t, pkt); > + (void)virtio_transport_reset_no_sock(t, skb); > goto free_pkt; > } > } > > - if (virtio_transport_get_type(sk) != le16_to_cpu(pkt->hdr.type)) { > - (void)virtio_transport_reset_no_sock(t, pkt); > + if (virtio_transport_get_type(sk) != le16_to_cpu(hdr->type)) { > + (void)virtio_transport_reset_no_sock(t, skb); > sock_put(sk); > goto free_pkt; > } > @@ -1290,13 +1277,13 @@ void virtio_transport_recv_pkt(struct > virtio_transport *t, > > /* Check if sk has been closed before lock_sock */ > if (sock_flag(sk, SOCK_DONE)) { > - (void)virtio_transport_reset_no_sock(t, pkt); > + (void)virtio_transport_reset_no_sock(t, skb); > release_sock(sk); > sock_put(sk); > goto free_pkt; > } > > - space_available = virtio_transport_space_update(sk, pkt); > + space_available = virtio_transport_space_update(sk, skb); > > /* Update CID in case it has changed after a transport reset event */ > if (vsk->local_addr.svm_cid != VMADDR_CID_ANY) > @@ -1307,23 +1294,23 @@ void virtio_transport_recv_pkt(struct > virtio_transport *t, > > switch (sk->sk_state) { > case TCP_LISTEN: > - virtio_transport_recv_listen(sk, pkt, t); > - virtio_transport_free_pkt(pkt); > + virtio_transport_recv_listen(sk, skb, t); > + kfree_skb(skb); > break; > case TCP_SYN_SENT: > - virtio_transport_recv_connecting(sk, pkt); > - virtio_transport_free_pkt(pkt); > + virtio_transport_recv_connecting(sk, skb); > + kfree_skb(skb); > break; > case TCP_ESTABLISHED: > - virtio_transport_recv_connected(sk, pkt); > + virtio_transport_recv_connected(sk, skb); > break; > case TCP_CLOSING: > - virtio_transport_recv_disconnecting(sk, pkt); > - virtio_transport_free_pkt(pkt); > + virtio_transport_recv_disconnecting(sk, skb); > + kfree_skb(skb); > break; > default: > - (void)virtio_transport_reset_no_sock(t, pkt); > - virtio_transport_free_pkt(pkt); > + (void)virtio_transport_reset_no_sock(t, skb); > + kfree_skb(skb); > break; > } > > @@ -1336,16 +1323,42 @@ void virtio_transport_recv_pkt(struct > virtio_transport *t, > return; > > free_pkt: > - virtio_transport_free_pkt(pkt); > + kfree(skb); > } > EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt); > > -void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt) > +/* Remove skbs found in a queue that have a vsk that matches. > + * > + * Each skb is freed. > + * > + * Returns the count of skbs that were reply packets. > + */ > +int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *queue) > { > - kfree(pkt->buf); > - kfree(pkt); > + int cnt = 0; > + struct sk_buff *skb, *tmp; > + struct sk_buff_head freeme; > + > + skb_queue_head_init(&freeme); > + > + spin_lock_bh(&queue->lock); > + skb_queue_walk_safe(queue, skb, tmp) { > + if (vsock_sk(skb->sk) != vsk) > + continue; > + > + __skb_unlink(skb, queue); > + skb_queue_tail(&freeme, skb); > + > + if (vsock_metadata(skb)->flags & > VIRTIO_VSOCK_METADATA_FLAGS_REPLY) > + cnt++; > + } > + spin_unlock_bh(&queue->lock); > + > + skb_queue_purge(&freeme); > + > + return cnt; > } > -EXPORT_SYMBOL_GPL(virtio_transport_free_pkt); > +EXPORT_SYMBOL_GPL(virtio_transport_purge_skbs); > > MODULE_LICENSE("GPL v2"); > MODULE_AUTHOR("Asias He"); > diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c > index 169a8cf65b39..906f7cdff65e 100644 > --- a/net/vmw_vsock/vsock_loopback.c > +++ b/net/vmw_vsock/vsock_loopback.c > @@ -16,7 +16,7 @@ struct vsock_loopback { > struct workqueue_struct *workqueue; > > spinlock_t pkt_list_lock; /* protects pkt_list */ > - struct list_head pkt_list; > + struct sk_buff_head pkt_queue; > struct work_struct pkt_work; > }; > > @@ -27,13 +27,13 @@ static u32 vsock_loopback_get_local_cid(void) > return VMADDR_CID_LOCAL; > } > > -static int vsock_loopback_send_pkt(struct virtio_vsock_pkt *pkt) > +static int vsock_loopback_send_pkt(struct sk_buff *skb) > { > struct vsock_loopback *vsock = &the_vsock_loopback; > - int len = pkt->len; > + int len = skb->len; > > spin_lock_bh(&vsock->pkt_list_lock); > - list_add_tail(&pkt->list, &vsock->pkt_list); > + skb_queue_tail(&vsock->pkt_queue, skb); > spin_unlock_bh(&vsock->pkt_list_lock); > > queue_work(vsock->workqueue, &vsock->pkt_work); > @@ -44,21 +44,8 @@ static int vsock_loopback_send_pkt(struct virtio_vsock_pkt > *pkt) > static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk) > { > struct vsock_loopback *vsock = &the_vsock_loopback; > - struct virtio_vsock_pkt *pkt, *n; > - LIST_HEAD(freeme); > > - spin_lock_bh(&vsock->pkt_list_lock); > - list_for_each_entry_safe(pkt, n, &vsock->pkt_list, list) { > - if (pkt->vsk != vsk) > - continue; > - list_move(&pkt->list, &freeme); > - } > - spin_unlock_bh(&vsock->pkt_list_lock); > - > - list_for_each_entry_safe(pkt, n, &freeme, list) { > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > + virtio_transport_purge_skbs(vsk, &vsock->pkt_queue); > > return 0; > } > @@ -121,20 +108,20 @@ static void vsock_loopback_work(struct work_struct > *work) > { > struct vsock_loopback *vsock = > container_of(work, struct vsock_loopback, pkt_work); > - LIST_HEAD(pkts); > + struct sk_buff_head pkts; > + > + skb_queue_head_init(&pkts); > > spin_lock_bh(&vsock->pkt_list_lock); > - list_splice_init(&vsock->pkt_list, &pkts); > + skb_queue_splice_init(&vsock->pkt_queue, &pkts); > spin_unlock_bh(&vsock->pkt_list_lock); > > - while (!list_empty(&pkts)) { > - struct virtio_vsock_pkt *pkt; > + while (!skb_queue_empty(&pkts)) { > + struct sk_buff *skb; > > - pkt = list_first_entry(&pkts, struct virtio_vsock_pkt, list); > - list_del_init(&pkt->list); > - > - virtio_transport_deliver_tap_pkt(pkt); > - virtio_transport_recv_pkt(&loopback_transport, pkt); > + skb = skb_dequeue(&pkts); > + virtio_transport_deliver_tap_pkt(skb); > + virtio_transport_recv_pkt(&loopback_transport, skb); > } > } > > @@ -148,7 +135,7 @@ static int __init vsock_loopback_init(void) > return -ENOMEM; > > spin_lock_init(&vsock->pkt_list_lock); > - INIT_LIST_HEAD(&vsock->pkt_list); > + skb_queue_head_init(&vsock->pkt_queue); > INIT_WORK(&vsock->pkt_work, vsock_loopback_work); > > ret = vsock_core_register(&loopback_transport.transport, > @@ -166,19 +153,13 @@ static int __init vsock_loopback_init(void) > static void __exit vsock_loopback_exit(void) > { > struct vsock_loopback *vsock = &the_vsock_loopback; > - struct virtio_vsock_pkt *pkt; > > vsock_core_unregister(&loopback_transport.transport); > > flush_work(&vsock->pkt_work); > > spin_lock_bh(&vsock->pkt_list_lock); > - while (!list_empty(&vsock->pkt_list)) { > - pkt = list_first_entry(&vsock->pkt_list, > - struct virtio_vsock_pkt, list); > - list_del(&pkt->list); > - virtio_transport_free_pkt(pkt); > - } > + skb_queue_purge(&vsock->pkt_queue); > spin_unlock_bh(&vsock->pkt_list_lock); > > destroy_workqueue(vsock->workqueue); > -- > 2.35.1 >
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