* Re: [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff
[not found] <20221215043645.3545127-1-bobby.eshleman@bytedance.com>
@ 2022-12-15 8:47 ` Stefano Garzarella
2022-12-15 9:04 ` Michael S. Tsirkin
2022-12-15 15:05 ` Paolo Abeni
2023-01-05 9:49 ` Michael S. Tsirkin
2 siblings, 1 reply; 6+ messages in thread
From: Stefano Garzarella @ 2022-12-15 8:47 UTC (permalink / raw)
To: Bobby Eshleman
Cc: Bobby Eshleman, Cong Wang, Krasnov Arseniy, Jiang Wang,
Michael S. Tsirkin, netdev, linux-kernel, virtualization,
Eric Dumazet, Stefan Hajnoczi, kvm, Jakub Kicinski, Paolo Abeni,
David S. Miller
On Thu, Dec 15, 2022 at 04:36:44AM +0000, Bobby Eshleman wrote:
>This commit changes virtio/vsock to use sk_buff instead of
>virtio_vsock_pkt. Beyond better conforming to other net code, using
>sk_buff allows vsock to use sk_buff-dependent features in the future
>(such as sockmap) and improves throughput.
>
>This patch introduces the following performance changes:
>
>Tool/Config: uperf w/ 64 threads, SOCK_STREAM
>Test Runs: 5, mean of results
>Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
>
>Test: 64KB, g2h
>Before: 21.63 Gb/s
>After: 25.59 Gb/s (+18%)
>
>Test: 16B, g2h
>Before: 11.86 Mb/s
>After: 17.41 Mb/s (+46%)
>
>Test: 64KB, h2g
>Before: 2.15 Gb/s
>After: 3.6 Gb/s (+67%)
>
>Test: 16B, h2g
>Before: 14.38 Mb/s
>After: 18.43 Mb/s (+28%)
>
>Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
>---
>
>Testing: passed vsock_test h2g and g2h
>Note2: net-next is closed, but sending out now in case more comments
>roll in, as discussed here:
>https://lore.kernel.org/all/Y34SoH1nFTXXLWbK@bullseye/
>
>Changes in v8:
>- vhost/vsock: remove unused enum
>- vhost/vsock: use spin_lock_bh() instead of spin_lock()
>- vsock/loopback: use __skb_dequeue instead of skb_dequeue
>
>Changes in v7:
>- use skb_queue_empty() instead of skb_queue_empty_lockless()
>
>Changes in v6:
>- use skb->cb instead of skb->_skb_refdst
>- use lock-free __skb_queue_purge for rx_queue when rx_lock held
>
>Changes in v5:
>- last_skb instead of skb: last_hdr->len = cpu_to_le32(last_skb->len)
>
>Changes in v4:
>- vdso/bits.h -> linux/bits.h
>- add virtio_vsock_alloc_skb() helper
>- virtio/vsock: rename buf_len -> total_len
>- update last_hdr->len
>- fix build_skb() for vsockmon (tested)
>- add queue helpers
>- use spin_{unlock/lock}_bh() instead of spin_lock()/spin_unlock()
>- note: I only ran a few g2h tests to check that this change
> had no perf impact. The above data is still from patch
> v3.
>
>Changes in v3:
>- fix seqpacket bug
>- use zero in vhost_add_used(..., 0) device doesn't write to buffer
>- use xmas tree style declarations
>- vsock_hdr() -> virtio_vsock_hdr() and other include file style fixes
>- no skb merging
>- save space by not using vsock_metadata
>- use _skb_refdst instead of skb buffer space for flags
>- use skb_pull() to keep track of read bytes instead of using an an
> extra variable 'off' in the skb buffer space
>- remove unnecessary sk_allocation assignment
>- do not zero hdr needlessly
>- introduce virtio_transport_skb_len() because skb->len changes now
>- use spin_lock() directly on queue lock instead of sk_buff_head helpers
> which use spin_lock_irqsave() (e.g., skb_dequeue)
>- do not reduce buffer size to be page size divisible
>- Note: the biggest performance change came from loosening the spinlock
> variation and not reducing the buffer size.
>
>Changes in v2:
>- Use alloc_skb() directly instead of sock_alloc_send_pskb() to minimize
> uAPI changes.
>- Do not marshal errors to -ENOMEM for non-virtio implementations.
>- No longer a part of the original series
>- Some code cleanup and refactoring
>- Include performance stats
>
> drivers/vhost/vsock.c | 213 +++++-------
> include/linux/virtio_vsock.h | 126 +++++--
> net/vmw_vsock/virtio_transport.c | 149 +++------
> net/vmw_vsock/virtio_transport_common.c | 422 +++++++++++++-----------
> net/vmw_vsock/vsock_loopback.c | 51 +--
> 5 files changed, 495 insertions(+), 466 deletions(-)
>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index 5703775af129..ee0a00432cb1 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;
>
>@@ -108,40 +107,33 @@ vhost_transport_do_send_pkt(struct vhost_vsock
>*vsock,
> vhost_disable_notify(&vsock->dev, vq);
>
> do {
>- struct virtio_vsock_pkt *pkt;
>+ struct virtio_vsock_hdr *hdr;
>+ size_t iov_len, payload_len;
> struct iov_iter iov_iter;
>+ u32 flags_to_restore = 0;
>+ struct sk_buff *skb;
> unsigned out, in;
> size_t nbytes;
>- size_t iov_len, payload_len;
> 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);
>+ spin_lock_bh(&vsock->send_pkt_queue.lock);
>+ skb = __skb_dequeue(&vsock->send_pkt_queue);
>+ spin_unlock_bh(&vsock->send_pkt_queue.lock);
Sorry for coming late, but I just commented in Paolo's reply.
Here I think we can directly use the new virtio_vsock_skb_dequeue().
With that fixed, you can put my R-b:
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Below I left a little comment.
>+
>+ 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);
>+ virtio_vsock_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);
>-
>+ virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> /* We cannot finish yet if more buffers snuck in while
> * re-enabling notify.
> */
>@@ -153,26 +145,27 @@ 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;
>+ hdr = virtio_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 +178,30 @@ 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,
>- &iov_iter);
>+ nbytes = copy_to_iter(skb->data, 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;
>+ skb_pull(skb, 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 (skb->len > 0) {
>+ 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);
>+ virtio_vsock_skb_clear_tap_delivered(skb);
>+ virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> } else {
>- if (pkt->reply) {
>+ if (virtio_vsock_skb_reply(skb)) {
> 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vhost_vsock *vsock;
>- int len = pkt->len;
>+ int len = skb->len;
>
> 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 (virtio_vsock_skb_reply(skb))
> 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_vsock_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];
>@@ -352,12 +324,14 @@ 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 virtio_vsock_hdr *hdr;
> struct iov_iter iov_iter;
>+ struct sk_buff *skb;
>+ size_t payload_len;
> size_t nbytes;
> size_t len;
>
>@@ -366,50 +340,47 @@ 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 */
>+ skb = virtio_vsock_alloc_skb(len, GFP_KERNEL);
>+ if (!skb)
> return NULL;
>
>- len = iov_length(vq->iov, out);
> 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 = virtio_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);
>+ payload_len = le32_to_cpu(hdr->len);
>
> /* No payload */
>- if (!pkt->len)
>- return pkt;
>+ if (!payload_len)
>+ return skb;
>
> /* The pkt is too big */
>- if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
>- kfree(pkt);
>+ if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
>+ kfree_skb(skb);
> return NULL;
> }
>
>- pkt->buf = kvmalloc(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, payload_len, &iov_iter);
>+ if (nbytes != payload_len) {
>+ vq_err(vq, "Expected %zu byte payload, got %zu bytes\n",
>+ payload_len, nbytes);
>+ kfree_skb(skb);
> return NULL;
> }
>
>- return pkt;
>+ return skb;
> }
>
> /* Is there space left for replies to rx packets? */
>@@ -496,9 +467,9 @@ 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;
> int head, pkts = 0, total_len = 0;
> unsigned int out, in;
>+ struct sk_buff *skb;
> bool added = false;
>
> mutex_lock(&vq->mutex);
>@@ -511,6 +482,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
>
> vhost_disable_notify(&vsock->dev, vq);
> do {
>+ struct virtio_vsock_hdr *hdr;
>+
> if (!vhost_vsock_more_replies(vsock)) {
> /* Stop tx until the device processes already
> * pending replies. Leave tx virtqueue
>@@ -532,24 +505,26 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> break;
> }
>
>- pkt = vhost_vsock_alloc_pkt(vq, out, in);
>- if (!pkt) {
>+ skb = vhost_vsock_alloc_skb(vq, out, in);
>+ if (!skb) {
> vq_err(vq, "Faulted on pkt\n");
> continue;
> }
>
>- total_len += sizeof(pkt->hdr) + pkt->len;
>+ total_len += sizeof(*hdr) + skb->len;
>
> /* Deliver to monitoring devices all received packets */
>- virtio_transport_deliver_tap_pkt(pkt);
>+ virtio_transport_deliver_tap_pkt(skb);
>+
>+ hdr = virtio_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);
> added = true;
>@@ -693,8 +668,7 @@ 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 +734,7 @@ 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);
>+ virtio_vsock_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..7ed943615271 100644
>--- a/include/linux/virtio_vsock.h
>+++ b/include/linux/virtio_vsock.h
>@@ -7,6 +7,106 @@
> #include <net/sock.h>
> #include <net/af_vsock.h>
>
>+#define VIRTIO_VSOCK_SKB_HEADROOM (sizeof(struct virtio_vsock_hdr))
>+
>+struct virtio_vsock_skb_cb {
>+ bool reply;
>+ bool tap_delivered;
>+};
>+
>+#define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb))
>+
>+static inline struct virtio_vsock_hdr *virtio_vsock_hdr(struct sk_buff *skb)
>+{
>+ return (struct virtio_vsock_hdr *)skb->head;
>+}
>+
>+static inline bool virtio_vsock_skb_reply(struct sk_buff *skb)
>+{
>+ return VIRTIO_VSOCK_SKB_CB(skb)->reply;
>+}
>+
>+static inline void virtio_vsock_skb_set_reply(struct sk_buff *skb)
>+{
>+ VIRTIO_VSOCK_SKB_CB(skb)->reply = true;
>+}
>+
>+static inline bool virtio_vsock_skb_tap_delivered(struct sk_buff *skb)
>+{
>+ return VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered;
>+}
>+
>+static inline void virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb)
>+{
>+ VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = true;
>+}
>+
>+static inline void virtio_vsock_skb_clear_tap_delivered(struct sk_buff *skb)
>+{
>+ VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = false;
>+}
Maybe, we can have a single
virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb,
bool tap_delivered)
to be used in both cases.
Anyway, I don't have a strong opinion on that.
Thanks,
Stefano
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff
2022-12-15 8:47 ` [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff Stefano Garzarella
@ 2022-12-15 9:04 ` Michael S. Tsirkin
2022-12-15 9:17 ` Stefano Garzarella
0 siblings, 1 reply; 6+ messages in thread
From: Michael S. Tsirkin @ 2022-12-15 9:04 UTC (permalink / raw)
To: Stefano Garzarella
Cc: Bobby Eshleman, Cong Wang, Stefan Hajnoczi, Jiang Wang, netdev,
linux-kernel, virtualization, Eric Dumazet, Krasnov Arseniy, kvm,
Jakub Kicinski, Paolo Abeni, David S. Miller, Bobby Eshleman
On Thu, Dec 15, 2022 at 09:47:57AM +0100, Stefano Garzarella wrote:
> On Thu, Dec 15, 2022 at 04:36:44AM +0000, Bobby Eshleman wrote:
> > This commit changes virtio/vsock to use sk_buff instead of
> > virtio_vsock_pkt. Beyond better conforming to other net code, using
> > sk_buff allows vsock to use sk_buff-dependent features in the future
> > (such as sockmap) and improves throughput.
> >
> > This patch introduces the following performance changes:
> >
> > Tool/Config: uperf w/ 64 threads, SOCK_STREAM
> > Test Runs: 5, mean of results
> > Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
> >
> > Test: 64KB, g2h
> > Before: 21.63 Gb/s
> > After: 25.59 Gb/s (+18%)
> >
> > Test: 16B, g2h
> > Before: 11.86 Mb/s
> > After: 17.41 Mb/s (+46%)
> >
> > Test: 64KB, h2g
> > Before: 2.15 Gb/s
> > After: 3.6 Gb/s (+67%)
> >
> > Test: 16B, h2g
> > Before: 14.38 Mb/s
> > After: 18.43 Mb/s (+28%)
> >
> > Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
> > ---
> >
> > Testing: passed vsock_test h2g and g2h
> > Note2: net-next is closed, but sending out now in case more comments
> > roll in, as discussed here:
> > https://lore.kernel.org/all/Y34SoH1nFTXXLWbK@bullseye/
> >
> > Changes in v8:
> > - vhost/vsock: remove unused enum
> > - vhost/vsock: use spin_lock_bh() instead of spin_lock()
> > - vsock/loopback: use __skb_dequeue instead of skb_dequeue
> >
> > Changes in v7:
> > - use skb_queue_empty() instead of skb_queue_empty_lockless()
> >
> > Changes in v6:
> > - use skb->cb instead of skb->_skb_refdst
> > - use lock-free __skb_queue_purge for rx_queue when rx_lock held
> >
> > Changes in v5:
> > - last_skb instead of skb: last_hdr->len = cpu_to_le32(last_skb->len)
> >
> > Changes in v4:
> > - vdso/bits.h -> linux/bits.h
> > - add virtio_vsock_alloc_skb() helper
> > - virtio/vsock: rename buf_len -> total_len
> > - update last_hdr->len
> > - fix build_skb() for vsockmon (tested)
> > - add queue helpers
> > - use spin_{unlock/lock}_bh() instead of spin_lock()/spin_unlock()
> > - note: I only ran a few g2h tests to check that this change
> > had no perf impact. The above data is still from patch
> > v3.
> >
> > Changes in v3:
> > - fix seqpacket bug
> > - use zero in vhost_add_used(..., 0) device doesn't write to buffer
> > - use xmas tree style declarations
> > - vsock_hdr() -> virtio_vsock_hdr() and other include file style fixes
> > - no skb merging
> > - save space by not using vsock_metadata
> > - use _skb_refdst instead of skb buffer space for flags
> > - use skb_pull() to keep track of read bytes instead of using an an
> > extra variable 'off' in the skb buffer space
> > - remove unnecessary sk_allocation assignment
> > - do not zero hdr needlessly
> > - introduce virtio_transport_skb_len() because skb->len changes now
> > - use spin_lock() directly on queue lock instead of sk_buff_head helpers
> > which use spin_lock_irqsave() (e.g., skb_dequeue)
> > - do not reduce buffer size to be page size divisible
> > - Note: the biggest performance change came from loosening the spinlock
> > variation and not reducing the buffer size.
> >
> > Changes in v2:
> > - Use alloc_skb() directly instead of sock_alloc_send_pskb() to minimize
> > uAPI changes.
> > - Do not marshal errors to -ENOMEM for non-virtio implementations.
> > - No longer a part of the original series
> > - Some code cleanup and refactoring
> > - Include performance stats
> >
> > drivers/vhost/vsock.c | 213 +++++-------
> > include/linux/virtio_vsock.h | 126 +++++--
> > net/vmw_vsock/virtio_transport.c | 149 +++------
> > net/vmw_vsock/virtio_transport_common.c | 422 +++++++++++++-----------
> > net/vmw_vsock/vsock_loopback.c | 51 +--
> > 5 files changed, 495 insertions(+), 466 deletions(-)
> >
> > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> > index 5703775af129..ee0a00432cb1 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;
> >
> > @@ -108,40 +107,33 @@ vhost_transport_do_send_pkt(struct vhost_vsock
> > *vsock,
> > vhost_disable_notify(&vsock->dev, vq);
> >
> > do {
> > - struct virtio_vsock_pkt *pkt;
> > + struct virtio_vsock_hdr *hdr;
> > + size_t iov_len, payload_len;
> > struct iov_iter iov_iter;
> > + u32 flags_to_restore = 0;
> > + struct sk_buff *skb;
> > unsigned out, in;
> > size_t nbytes;
> > - size_t iov_len, payload_len;
> > 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);
> > + spin_lock_bh(&vsock->send_pkt_queue.lock);
> > + skb = __skb_dequeue(&vsock->send_pkt_queue);
> > + spin_unlock_bh(&vsock->send_pkt_queue.lock);
>
> Sorry for coming late, but I just commented in Paolo's reply.
> Here I think we can directly use the new virtio_vsock_skb_dequeue().
Yea, pretty late.
And using that will prevent me from merging this since it's not in my tree yet.
We can do a cleanup patch on top.
> With that fixed, you can put my R-b:
>
> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
>
> Below I left a little comment.
>
> > +
> > + 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);
> > + virtio_vsock_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);
> > -
> > + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> > /* We cannot finish yet if more buffers snuck in while
> > * re-enabling notify.
> > */
> > @@ -153,26 +145,27 @@ 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;
> > + hdr = virtio_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 +178,30 @@ 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,
> > - &iov_iter);
> > + nbytes = copy_to_iter(skb->data, 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;
> > + skb_pull(skb, 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 (skb->len > 0) {
> > + 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);
> > + virtio_vsock_skb_clear_tap_delivered(skb);
> > + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> > } else {
> > - if (pkt->reply) {
> > + if (virtio_vsock_skb_reply(skb)) {
> > 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> > struct vhost_vsock *vsock;
> > - int len = pkt->len;
> > + int len = skb->len;
> >
> > 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 (virtio_vsock_skb_reply(skb))
> > 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_vsock_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];
> > @@ -352,12 +324,14 @@ 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 virtio_vsock_hdr *hdr;
> > struct iov_iter iov_iter;
> > + struct sk_buff *skb;
> > + size_t payload_len;
> > size_t nbytes;
> > size_t len;
> >
> > @@ -366,50 +340,47 @@ 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 */
> > + skb = virtio_vsock_alloc_skb(len, GFP_KERNEL);
> > + if (!skb)
> > return NULL;
> >
> > - len = iov_length(vq->iov, out);
> > 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 = virtio_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);
> > + payload_len = le32_to_cpu(hdr->len);
> >
> > /* No payload */
> > - if (!pkt->len)
> > - return pkt;
> > + if (!payload_len)
> > + return skb;
> >
> > /* The pkt is too big */
> > - if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> > - kfree(pkt);
> > + if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> > + kfree_skb(skb);
> > return NULL;
> > }
> >
> > - pkt->buf = kvmalloc(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, payload_len, &iov_iter);
> > + if (nbytes != payload_len) {
> > + vq_err(vq, "Expected %zu byte payload, got %zu bytes\n",
> > + payload_len, nbytes);
> > + kfree_skb(skb);
> > return NULL;
> > }
> >
> > - return pkt;
> > + return skb;
> > }
> >
> > /* Is there space left for replies to rx packets? */
> > @@ -496,9 +467,9 @@ 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;
> > int head, pkts = 0, total_len = 0;
> > unsigned int out, in;
> > + struct sk_buff *skb;
> > bool added = false;
> >
> > mutex_lock(&vq->mutex);
> > @@ -511,6 +482,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> >
> > vhost_disable_notify(&vsock->dev, vq);
> > do {
> > + struct virtio_vsock_hdr *hdr;
> > +
> > if (!vhost_vsock_more_replies(vsock)) {
> > /* Stop tx until the device processes already
> > * pending replies. Leave tx virtqueue
> > @@ -532,24 +505,26 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> > break;
> > }
> >
> > - pkt = vhost_vsock_alloc_pkt(vq, out, in);
> > - if (!pkt) {
> > + skb = vhost_vsock_alloc_skb(vq, out, in);
> > + if (!skb) {
> > vq_err(vq, "Faulted on pkt\n");
> > continue;
> > }
> >
> > - total_len += sizeof(pkt->hdr) + pkt->len;
> > + total_len += sizeof(*hdr) + skb->len;
> >
> > /* Deliver to monitoring devices all received packets */
> > - virtio_transport_deliver_tap_pkt(pkt);
> > + virtio_transport_deliver_tap_pkt(skb);
> > +
> > + hdr = virtio_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);
> > added = true;
> > @@ -693,8 +668,7 @@ 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 +734,7 @@ 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);
> > + virtio_vsock_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..7ed943615271 100644
> > --- a/include/linux/virtio_vsock.h
> > +++ b/include/linux/virtio_vsock.h
> > @@ -7,6 +7,106 @@
> > #include <net/sock.h>
> > #include <net/af_vsock.h>
> >
> > +#define VIRTIO_VSOCK_SKB_HEADROOM (sizeof(struct virtio_vsock_hdr))
> > +
> > +struct virtio_vsock_skb_cb {
> > + bool reply;
> > + bool tap_delivered;
> > +};
> > +
> > +#define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb))
> > +
> > +static inline struct virtio_vsock_hdr *virtio_vsock_hdr(struct sk_buff *skb)
> > +{
> > + return (struct virtio_vsock_hdr *)skb->head;
> > +}
> > +
> > +static inline bool virtio_vsock_skb_reply(struct sk_buff *skb)
> > +{
> > + return VIRTIO_VSOCK_SKB_CB(skb)->reply;
> > +}
> > +
> > +static inline void virtio_vsock_skb_set_reply(struct sk_buff *skb)
> > +{
> > + VIRTIO_VSOCK_SKB_CB(skb)->reply = true;
> > +}
> > +
> > +static inline bool virtio_vsock_skb_tap_delivered(struct sk_buff *skb)
> > +{
> > + return VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered;
> > +}
> > +
> > +static inline void virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb)
> > +{
> > + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = true;
> > +}
> > +
> > +static inline void virtio_vsock_skb_clear_tap_delivered(struct sk_buff *skb)
> > +{
> > + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = false;
> > +}
>
> Maybe, we can have a single
>
> virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb,
> bool tap_delivered)
>
> to be used in both cases.
>
> Anyway, I don't have a strong opinion on that.
>
> Thanks,
> Stefano
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff
2022-12-15 9:04 ` Michael S. Tsirkin
@ 2022-12-15 9:17 ` Stefano Garzarella
0 siblings, 0 replies; 6+ messages in thread
From: Stefano Garzarella @ 2022-12-15 9:17 UTC (permalink / raw)
To: Michael S. Tsirkin
Cc: Bobby Eshleman, Cong Wang, Stefan Hajnoczi, Jiang Wang, netdev,
linux-kernel, virtualization, Eric Dumazet, Krasnov Arseniy, kvm,
Jakub Kicinski, Paolo Abeni, David S. Miller, Bobby Eshleman
On Thu, Dec 15, 2022 at 04:04:53AM -0500, Michael S. Tsirkin wrote:
>On Thu, Dec 15, 2022 at 09:47:57AM +0100, Stefano Garzarella wrote:
>> On Thu, Dec 15, 2022 at 04:36:44AM +0000, Bobby Eshleman wrote:
>> > This commit changes virtio/vsock to use sk_buff instead of
>> > virtio_vsock_pkt. Beyond better conforming to other net code, using
>> > sk_buff allows vsock to use sk_buff-dependent features in the future
>> > (such as sockmap) and improves throughput.
>> >
>> > This patch introduces the following performance changes:
>> >
>> > Tool/Config: uperf w/ 64 threads, SOCK_STREAM
>> > Test Runs: 5, mean of results
>> > Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
>> >
>> > Test: 64KB, g2h
>> > Before: 21.63 Gb/s
>> > After: 25.59 Gb/s (+18%)
>> >
>> > Test: 16B, g2h
>> > Before: 11.86 Mb/s
>> > After: 17.41 Mb/s (+46%)
>> >
>> > Test: 64KB, h2g
>> > Before: 2.15 Gb/s
>> > After: 3.6 Gb/s (+67%)
>> >
>> > Test: 16B, h2g
>> > Before: 14.38 Mb/s
>> > After: 18.43 Mb/s (+28%)
>> >
>> > Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
>> > ---
>> >
>> > Testing: passed vsock_test h2g and g2h
>> > Note2: net-next is closed, but sending out now in case more comments
>> > roll in, as discussed here:
>> > https://lore.kernel.org/all/Y34SoH1nFTXXLWbK@bullseye/
>> >
>> > Changes in v8:
>> > - vhost/vsock: remove unused enum
>> > - vhost/vsock: use spin_lock_bh() instead of spin_lock()
>> > - vsock/loopback: use __skb_dequeue instead of skb_dequeue
>> >
>> > Changes in v7:
>> > - use skb_queue_empty() instead of skb_queue_empty_lockless()
>> >
>> > Changes in v6:
>> > - use skb->cb instead of skb->_skb_refdst
>> > - use lock-free __skb_queue_purge for rx_queue when rx_lock held
>> >
>> > Changes in v5:
>> > - last_skb instead of skb: last_hdr->len = cpu_to_le32(last_skb->len)
>> >
>> > Changes in v4:
>> > - vdso/bits.h -> linux/bits.h
>> > - add virtio_vsock_alloc_skb() helper
>> > - virtio/vsock: rename buf_len -> total_len
>> > - update last_hdr->len
>> > - fix build_skb() for vsockmon (tested)
>> > - add queue helpers
>> > - use spin_{unlock/lock}_bh() instead of spin_lock()/spin_unlock()
>> > - note: I only ran a few g2h tests to check that this change
>> > had no perf impact. The above data is still from patch
>> > v3.
>> >
>> > Changes in v3:
>> > - fix seqpacket bug
>> > - use zero in vhost_add_used(..., 0) device doesn't write to buffer
>> > - use xmas tree style declarations
>> > - vsock_hdr() -> virtio_vsock_hdr() and other include file style fixes
>> > - no skb merging
>> > - save space by not using vsock_metadata
>> > - use _skb_refdst instead of skb buffer space for flags
>> > - use skb_pull() to keep track of read bytes instead of using an an
>> > extra variable 'off' in the skb buffer space
>> > - remove unnecessary sk_allocation assignment
>> > - do not zero hdr needlessly
>> > - introduce virtio_transport_skb_len() because skb->len changes now
>> > - use spin_lock() directly on queue lock instead of sk_buff_head helpers
>> > which use spin_lock_irqsave() (e.g., skb_dequeue)
>> > - do not reduce buffer size to be page size divisible
>> > - Note: the biggest performance change came from loosening the spinlock
>> > variation and not reducing the buffer size.
>> >
>> > Changes in v2:
>> > - Use alloc_skb() directly instead of sock_alloc_send_pskb() to minimize
>> > uAPI changes.
>> > - Do not marshal errors to -ENOMEM for non-virtio implementations.
>> > - No longer a part of the original series
>> > - Some code cleanup and refactoring
>> > - Include performance stats
>> >
>> > drivers/vhost/vsock.c | 213 +++++-------
>> > include/linux/virtio_vsock.h | 126 +++++--
>> > net/vmw_vsock/virtio_transport.c | 149 +++------
>> > net/vmw_vsock/virtio_transport_common.c | 422 +++++++++++++-----------
>> > net/vmw_vsock/vsock_loopback.c | 51 +--
>> > 5 files changed, 495 insertions(+), 466 deletions(-)
>> >
>> > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>> > index 5703775af129..ee0a00432cb1 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;
>> >
>> > @@ -108,40 +107,33 @@ vhost_transport_do_send_pkt(struct vhost_vsock
>> > *vsock,
>> > vhost_disable_notify(&vsock->dev, vq);
>> >
>> > do {
>> > - struct virtio_vsock_pkt *pkt;
>> > + struct virtio_vsock_hdr *hdr;
>> > + size_t iov_len, payload_len;
>> > struct iov_iter iov_iter;
>> > + u32 flags_to_restore = 0;
>> > + struct sk_buff *skb;
>> > unsigned out, in;
>> > size_t nbytes;
>> > - size_t iov_len, payload_len;
>> > 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);
>> > + spin_lock_bh(&vsock->send_pkt_queue.lock);
>> > + skb = __skb_dequeue(&vsock->send_pkt_queue);
>> > + spin_unlock_bh(&vsock->send_pkt_queue.lock);
>>
>> Sorry for coming late, but I just commented in Paolo's reply.
>> Here I think we can directly use the new virtio_vsock_skb_dequeue().
>
>Yea, pretty late.
>And using that will prevent me from merging this since it's not in my tree yet.
>We can do a cleanup patch on top.
Yep, sure!
Functionally nothing changes, so it's fine with a patch on top.
So, for this patch:
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Thanks,
Stefano
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff
[not found] <20221215043645.3545127-1-bobby.eshleman@bytedance.com>
2022-12-15 8:47 ` [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff Stefano Garzarella
@ 2022-12-15 15:05 ` Paolo Abeni
2023-01-05 9:49 ` Michael S. Tsirkin
2 siblings, 0 replies; 6+ messages in thread
From: Paolo Abeni @ 2022-12-15 15:05 UTC (permalink / raw)
To: Bobby Eshleman
Cc: Bobby Eshleman, Cong Wang, Krasnov Arseniy, Jiang Wang,
Michael S. Tsirkin, netdev, linux-kernel, virtualization,
Eric Dumazet, Stefan Hajnoczi, kvm, Jakub Kicinski,
David S. Miller
On Thu, 2022-12-15 at 04:36 +0000, Bobby Eshleman wrote:
> This commit changes virtio/vsock to use sk_buff instead of
> virtio_vsock_pkt. Beyond better conforming to other net code, using
> sk_buff allows vsock to use sk_buff-dependent features in the future
> (such as sockmap) and improves throughput.
>
> This patch introduces the following performance changes:
>
> Tool/Config: uperf w/ 64 threads, SOCK_STREAM
> Test Runs: 5, mean of results
> Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
>
> Test: 64KB, g2h
> Before: 21.63 Gb/s
> After: 25.59 Gb/s (+18%)
>
> Test: 16B, g2h
> Before: 11.86 Mb/s
> After: 17.41 Mb/s (+46%)
>
> Test: 64KB, h2g
> Before: 2.15 Gb/s
> After: 3.6 Gb/s (+67%)
>
> Test: 16B, h2g
> Before: 14.38 Mb/s
> After: 18.43 Mb/s (+28%)
>
> Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
> ---
>
> Testing: passed vsock_test h2g and g2h
> Note2: net-next is closed, but sending out now in case more comments
> roll in, as discussed here:
> https://lore.kernel.org/all/Y34SoH1nFTXXLWbK@bullseye/
>
> Changes in v8:
> - vhost/vsock: remove unused enum
> - vhost/vsock: use spin_lock_bh() instead of spin_lock()
> - vsock/loopback: use __skb_dequeue instead of skb_dequeue
>
> Changes in v7:
> - use skb_queue_empty() instead of skb_queue_empty_lockless()
>
> Changes in v6:
> - use skb->cb instead of skb->_skb_refdst
> - use lock-free __skb_queue_purge for rx_queue when rx_lock held
>
> Changes in v5:
> - last_skb instead of skb: last_hdr->len = cpu_to_le32(last_skb->len)
>
> Changes in v4:
> - vdso/bits.h -> linux/bits.h
> - add virtio_vsock_alloc_skb() helper
> - virtio/vsock: rename buf_len -> total_len
> - update last_hdr->len
> - fix build_skb() for vsockmon (tested)
> - add queue helpers
> - use spin_{unlock/lock}_bh() instead of spin_lock()/spin_unlock()
> - note: I only ran a few g2h tests to check that this change
> had no perf impact. The above data is still from patch
> v3.
>
> Changes in v3:
> - fix seqpacket bug
> - use zero in vhost_add_used(..., 0) device doesn't write to buffer
> - use xmas tree style declarations
> - vsock_hdr() -> virtio_vsock_hdr() and other include file style fixes
> - no skb merging
> - save space by not using vsock_metadata
> - use _skb_refdst instead of skb buffer space for flags
> - use skb_pull() to keep track of read bytes instead of using an an
> extra variable 'off' in the skb buffer space
> - remove unnecessary sk_allocation assignment
> - do not zero hdr needlessly
> - introduce virtio_transport_skb_len() because skb->len changes now
> - use spin_lock() directly on queue lock instead of sk_buff_head helpers
> which use spin_lock_irqsave() (e.g., skb_dequeue)
> - do not reduce buffer size to be page size divisible
> - Note: the biggest performance change came from loosening the spinlock
> variation and not reducing the buffer size.
>
> Changes in v2:
> - Use alloc_skb() directly instead of sock_alloc_send_pskb() to minimize
> uAPI changes.
> - Do not marshal errors to -ENOMEM for non-virtio implementations.
> - No longer a part of the original series
> - Some code cleanup and refactoring
> - Include performance stats
>
> drivers/vhost/vsock.c | 213 +++++-------
> include/linux/virtio_vsock.h | 126 +++++--
> net/vmw_vsock/virtio_transport.c | 149 +++------
> net/vmw_vsock/virtio_transport_common.c | 422 +++++++++++++-----------
> net/vmw_vsock/vsock_loopback.c | 51 +--
> 5 files changed, 495 insertions(+), 466 deletions(-)
>
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index 5703775af129..ee0a00432cb1 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;
>
> @@ -108,40 +107,33 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> vhost_disable_notify(&vsock->dev, vq);
>
> do {
> - struct virtio_vsock_pkt *pkt;
> + struct virtio_vsock_hdr *hdr;
> + size_t iov_len, payload_len;
> struct iov_iter iov_iter;
> + u32 flags_to_restore = 0;
> + struct sk_buff *skb;
> unsigned out, in;
> size_t nbytes;
> - size_t iov_len, payload_len;
> 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);
> + spin_lock_bh(&vsock->send_pkt_queue.lock);
> + skb = __skb_dequeue(&vsock->send_pkt_queue);
> + spin_unlock_bh(&vsock->send_pkt_queue.lock);
> +
> + 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);
> + virtio_vsock_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);
> -
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> /* We cannot finish yet if more buffers snuck in while
> * re-enabling notify.
> */
> @@ -153,26 +145,27 @@ 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;
> + hdr = virtio_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 +178,30 @@ 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,
> - &iov_iter);
> + nbytes = copy_to_iter(skb->data, 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;
> + skb_pull(skb, 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 (skb->len > 0) {
> + 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);
> + virtio_vsock_skb_clear_tap_delivered(skb);
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> } else {
> - if (pkt->reply) {
> + if (virtio_vsock_skb_reply(skb)) {
> 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vhost_vsock *vsock;
> - int len = pkt->len;
> + int len = skb->len;
>
> 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 (virtio_vsock_skb_reply(skb))
> 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_vsock_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];
> @@ -352,12 +324,14 @@ 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 virtio_vsock_hdr *hdr;
> struct iov_iter iov_iter;
> + struct sk_buff *skb;
> + size_t payload_len;
> size_t nbytes;
> size_t len;
>
> @@ -366,50 +340,47 @@ 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 */
> + skb = virtio_vsock_alloc_skb(len, GFP_KERNEL);
> + if (!skb)
> return NULL;
>
> - len = iov_length(vq->iov, out);
> 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 = virtio_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);
> + payload_len = le32_to_cpu(hdr->len);
>
> /* No payload */
> - if (!pkt->len)
> - return pkt;
> + if (!payload_len)
> + return skb;
>
> /* The pkt is too big */
> - if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> - kfree(pkt);
> + if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> + kfree_skb(skb);
> return NULL;
> }
>
> - pkt->buf = kvmalloc(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, payload_len, &iov_iter);
> + if (nbytes != payload_len) {
> + vq_err(vq, "Expected %zu byte payload, got %zu bytes\n",
> + payload_len, nbytes);
> + kfree_skb(skb);
> return NULL;
> }
>
> - return pkt;
> + return skb;
> }
>
> /* Is there space left for replies to rx packets? */
> @@ -496,9 +467,9 @@ 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;
> int head, pkts = 0, total_len = 0;
> unsigned int out, in;
> + struct sk_buff *skb;
> bool added = false;
>
> mutex_lock(&vq->mutex);
> @@ -511,6 +482,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
>
> vhost_disable_notify(&vsock->dev, vq);
> do {
> + struct virtio_vsock_hdr *hdr;
> +
> if (!vhost_vsock_more_replies(vsock)) {
> /* Stop tx until the device processes already
> * pending replies. Leave tx virtqueue
> @@ -532,24 +505,26 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> break;
> }
>
> - pkt = vhost_vsock_alloc_pkt(vq, out, in);
> - if (!pkt) {
> + skb = vhost_vsock_alloc_skb(vq, out, in);
> + if (!skb) {
> vq_err(vq, "Faulted on pkt\n");
> continue;
> }
>
> - total_len += sizeof(pkt->hdr) + pkt->len;
> + total_len += sizeof(*hdr) + skb->len;
>
> /* Deliver to monitoring devices all received packets */
> - virtio_transport_deliver_tap_pkt(pkt);
> + virtio_transport_deliver_tap_pkt(skb);
> +
> + hdr = virtio_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);
> added = true;
> @@ -693,8 +668,7 @@ 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 +734,7 @@ 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);
> + virtio_vsock_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..7ed943615271 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -7,6 +7,106 @@
> #include <net/sock.h>
> #include <net/af_vsock.h>
>
> +#define VIRTIO_VSOCK_SKB_HEADROOM (sizeof(struct virtio_vsock_hdr))
> +
> +struct virtio_vsock_skb_cb {
> + bool reply;
> + bool tap_delivered;
> +};
> +
> +#define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb))
> +
> +static inline struct virtio_vsock_hdr *virtio_vsock_hdr(struct sk_buff *skb)
> +{
> + return (struct virtio_vsock_hdr *)skb->head;
> +}
> +
> +static inline bool virtio_vsock_skb_reply(struct sk_buff *skb)
> +{
> + return VIRTIO_VSOCK_SKB_CB(skb)->reply;
> +}
> +
> +static inline void virtio_vsock_skb_set_reply(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->reply = true;
> +}
> +
> +static inline bool virtio_vsock_skb_tap_delivered(struct sk_buff *skb)
> +{
> + return VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered;
> +}
> +
> +static inline void virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = true;
> +}
> +
> +static inline void virtio_vsock_skb_clear_tap_delivered(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = false;
> +}
> +
> +static inline void virtio_vsock_skb_rx_put(struct sk_buff *skb)
> +{
> + u32 len;
> +
> + len = le32_to_cpu(virtio_vsock_hdr(skb)->len);
> +
> + if (len > 0)
> + skb_put(skb, len);
> +}
> +
> +static inline struct sk_buff *virtio_vsock_alloc_skb(unsigned int size, gfp_t mask)
> +{
> + struct sk_buff *skb;
> +
> + skb = alloc_skb(size, mask);
> + if (!skb)
> + return NULL;
> +
> + skb_reserve(skb, VIRTIO_VSOCK_SKB_HEADROOM);
> + return skb;
> +}
> +
> +static inline void
> +virtio_vsock_skb_queue_head(struct sk_buff_head *list, struct sk_buff *skb)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_head(list, skb);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline void
> +virtio_vsock_skb_queue_tail(struct sk_buff_head *list, struct sk_buff *skb)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_tail(list, skb);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline struct sk_buff *virtio_vsock_skb_dequeue(struct sk_buff_head *list)
> +{
> + struct sk_buff *skb;
> +
> + spin_lock_bh(&list->lock);
> + skb = __skb_dequeue(list);
> + spin_unlock_bh(&list->lock);
> +
> + return skb;
> +}
> +
> +static inline void virtio_vsock_skb_queue_purge(struct sk_buff_head *list)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_purge(list);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline size_t virtio_vsock_skb_len(struct sk_buff *skb)
> +{
> + return (size_t)(skb_end_pointer(skb) - skb->head);
> +}
> +
> #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 +135,10 @@ 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 +155,7 @@ 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 +236,10 @@ 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 *list);
> #endif /* _LINUX_VIRTIO_VSOCK_H */
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index ad64f403536a..28b5a8e8e094 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -42,8 +42,7 @@ 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 +100,31 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> vq = vsock->vqs[VSOCK_VQ_TX];
>
> for (;;) {
> - struct virtio_vsock_pkt *pkt;
> struct scatterlist hdr, buf, *sgs[2];
> int ret, in_sg = 0, out_sg = 0;
> + struct sk_buff *skb;
> 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);
> + skb = virtio_vsock_skb_dequeue(&vsock->send_pkt_queue);
> + if (!skb)
> 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);
>
> - virtio_transport_deliver_tap_pkt(pkt);
> + virtio_transport_deliver_tap_pkt(skb);
> + reply = virtio_vsock_skb_reply(skb);
>
> - reply = pkt->reply;
> -
> - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
> + sg_init_one(&hdr, virtio_vsock_hdr(skb), sizeof(*virtio_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);
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> break;
> }
>
> @@ -164,32 +153,32 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> }
>
> 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 = virtio_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 (virtio_vsock_skb_reply(skb))
> 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_vsock_skb_queue_tail(&vsock->send_pkt_queue, skb);
> queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
>
> out_rcu:
> @@ -201,9 +190,7 @@ 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 +199,7 @@ 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 +220,28 @@ 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];
> + int total_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE + VIRTIO_VSOCK_SKB_HEADROOM;
> + struct scatterlist pkt, *p;
> struct virtqueue *vq;
> + struct sk_buff *skb;
> int ret;
>
> vq = vsock->vqs[VSOCK_VQ_RX];
>
> do {
> - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
> - if (!pkt)
> + skb = virtio_vsock_alloc_skb(total_len, GFP_KERNEL);
> + if (!skb)
> break;
>
> - pkt->buf = kmalloc(buf_len, GFP_KERNEL);
> - if (!pkt->buf) {
> - virtio_transport_free_pkt(pkt);
> + memset(skb->head, 0, VIRTIO_VSOCK_SKB_HEADROOM);
> + sg_init_one(&pkt, virtio_vsock_hdr(skb), total_len);
> + p = &pkt;
> + ret = virtqueue_add_sgs(vq, &p, 0, 1, skb, GFP_KERNEL);
> + if (ret < 0) {
> + kfree_skb(skb);
> break;
> }
>
> - pkt->buf_len = buf_len;
> - pkt->len = buf_len;
> -
> - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
> - sgs[0] = &hdr;
> -
> - 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);
> - break;
> - }
> vsock->rx_buf_nr++;
> } while (vq->num_free);
> if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
> @@ -299,12 +263,12 @@ 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 +493,7 @@ static void virtio_transport_rx_work(struct work_struct *work)
> do {
> virtqueue_disable_cb(vq);
> for (;;) {
> - struct virtio_vsock_pkt *pkt;
> + struct sk_buff *skb;
> unsigned int len;
>
> if (!virtio_transport_more_replies(vsock)) {
> @@ -540,23 +504,22 @@ 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(struct virtio_vsock_hdr) ||
> + len > virtio_vsock_skb_len(skb))) {
> + kfree_skb(skb);
> continue;
> }
>
> - pkt->len = len - sizeof(pkt->hdr);
> - virtio_transport_deliver_tap_pkt(pkt);
> - virtio_transport_recv_pkt(&virtio_transport, pkt);
> + 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 +573,7 @@ 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 +600,16 @@ 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);
> + virtio_vsock_skb_queue_purge(&vsock->send_pkt_queue);
>
> /* Delete virtqueues and flush outstanding callbacks if any */
> vdev->config->del_vqs(vdev);
> @@ -690,8 +646,7 @@ 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 a9980e9b9304..a1581c77cf84 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -37,53 +37,56 @@ 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)
> {
> - struct virtio_vsock_pkt *pkt;
> + const size_t skb_len = VIRTIO_VSOCK_SKB_HEADROOM + len;
> + struct virtio_vsock_hdr *hdr;
> + struct sk_buff *skb;
> + void *payload;
> int err;
>
> - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
> - if (!pkt)
> + skb = virtio_vsock_alloc_skb(skb_len, GFP_KERNEL);
> + if (!skb)
> return NULL;
>
> - 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;
> + hdr = virtio_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) {
> - pkt->buf = kmalloc(len, GFP_KERNEL);
> - if (!pkt->buf)
> - goto out_pkt;
> -
> - pkt->buf_len = len;
> -
> - err = memcpy_from_msg(pkt->buf, info->msg, len);
> + payload = skb_put(skb, len);
> + err = memcpy_from_msg(payload, info->msg, len);
> if (err)
> 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)
> + virtio_vsock_skb_set_reply(skb);
> +
> trace_virtio_transport_alloc_pkt(src_cid, src_port,
> dst_cid, dst_port,
> len,
> @@ -91,19 +94,18 @@ 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 virtio_vsock_hdr *pkt_hdr;
> + struct sk_buff *pkt = opaque;
> struct af_vsockmon_hdr *hdr;
> struct sk_buff *skb;
> size_t payload_len;
> @@ -113,10 +115,11 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> * 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;
> + pkt_hdr = virtio_vsock_hdr(pkt);
> + payload_len = pkt->len;
> + payload_buf = pkt->data;
>
> - skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len,
> + skb = alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len,
> GFP_ATOMIC);
> if (!skb)
> return NULL;
> @@ -124,16 +127,16 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> 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->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));
> + hdr->len = cpu_to_le16(sizeof(*pkt_hdr));
> memset(hdr->reserved, 0, sizeof(hdr->reserved));
>
> - switch (le16_to_cpu(pkt->hdr.op)) {
> + 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);
> @@ -154,7 +157,7 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> break;
> }
>
> - skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr));
> + skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr));
>
> if (payload_len) {
> skb_put_data(skb, payload_buf, payload_len);
> @@ -163,13 +166,13 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> return skb;
> }
>
> -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 (virtio_vsock_skb_tap_delivered(skb))
> return;
>
> - vsock_deliver_tap(virtio_transport_build_skb, pkt);
> - pkt->tap_delivered = true;
> + vsock_deliver_tap(virtio_transport_build_skb, skb);
> + virtio_vsock_skb_set_tap_delivered(skb);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
>
> @@ -192,8 +195,8 @@ 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;
> u32 pkt_len = info->pkt_len;
> + struct sk_buff *skb;
>
> info->type = virtio_transport_get_type(sk_vsock(vsk));
>
> @@ -224,42 +227,47 @@ 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) {
> + if (!skb) {
> virtio_transport_put_credit(vvs, pkt_len);
> return -ENOMEM;
> }
>
> - virtio_transport_inc_tx_pkt(vvs, pkt);
> + virtio_transport_inc_tx_pkt(vvs, skb);
>
> - return t_ops->send_pkt(pkt);
> + return t_ops->send_pkt(skb);
> }
>
> 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;
> + int len;
> +
> + len = skb_headroom(skb) - sizeof(struct virtio_vsock_hdr) - skb->len;
> + vvs->rx_bytes -= len;
> + vvs->fwd_cnt += 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 = virtio_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 +311,29 @@ virtio_transport_stream_do_peek(struct vsock_sock *vsk,
> size_t len)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> - struct virtio_vsock_pkt *pkt;
> size_t bytes, total = 0, off;
> + struct sk_buff *skb, *tmp;
> 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 = 0;
>
> 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 +360,38 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> size_t len)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> - struct virtio_vsock_pkt *pkt;
> size_t bytes, total = 0;
> - u32 free_space;
> + struct sk_buff *skb;
> int err = -EFAULT;
> + u32 free_space;
>
> 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(&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)
> + bytes = skb->len;
>
> /* 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, 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);
> + skb_pull(skb, bytes);
> +
> + if (skb->len == 0) {
> + virtio_transport_dec_rx_pkt(vvs, skb);
> + consume_skb(skb);
> + } else {
> + __skb_queue_head(&vvs->rx_queue, skb);
> }
> }
>
> @@ -414,10 +423,10 @@ 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;
> int dequeued_len = 0;
> size_t user_buf_len = msg_data_left(msg);
> bool msg_ready = false;
> + struct sk_buff *skb;
>
> spin_lock_bh(&vvs->rx_lock);
>
> @@ -427,13 +436,18 @@ 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);
> + if (!skb)
> + break;
> + hdr = virtio_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 +458,7 @@ 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.
> @@ -452,6 +466,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
> dequeued_len = err;
> } else {
> user_buf_len -= bytes_to_copy;
> + skb_pull(skb, bytes_to_copy);
> }
>
> spin_lock_bh(&vvs->rx_lock);
> @@ -461,17 +476,16 @@ 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 +623,7 @@ 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;
> }
> @@ -806,16 +820,16 @@ 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(virtio_vsock_hdr(skb)->op) == VIRTIO_VSOCK_OP_RST)
> return 0;
>
> return virtio_transport_send_pkt_info(vsk, &info);
> @@ -825,29 +839,30 @@ 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 virtio_vsock_hdr *hdr = virtio_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,
> };
> + struct sk_buff *reply;
>
> /* 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));
> if (!reply)
> return -ENOMEM;
>
> if (!t) {
> - virtio_transport_free_pkt(reply);
> + kfree_skb(reply);
> return -ENOTCONN;
> }
>
> @@ -858,16 +873,11 @@ 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);
> }
>
> @@ -981,13 +991,14 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> - int err;
> int skerr;
> + int err;
>
> - 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;
> @@ -1008,7 +1019,7 @@ 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);
> @@ -1017,34 +1028,37 @@ 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;
> bool can_enqueue, free_pkt = false;
> + struct virtio_vsock_hdr *hdr;
> + u32 len;
>
> - pkt->len = le32_to_cpu(pkt->hdr.len);
> - pkt->off = 0;
> + hdr = virtio_vsock_hdr(skb);
> + len = le32_to_cpu(hdr->len);
>
> 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(&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 = virtio_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
> @@ -1052,35 +1066,35 @@ 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_EOM)) {
> + 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;
> + last_hdr->len = cpu_to_le32(last_skb->len);
> 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> 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);
> vsock_data_ready(sk);
> return err;
> case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
> @@ -1090,18 +1104,17 @@ 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(virtio_vsock_hdr(skb)->flags))
> sk->sk_state_change(sk);
> break;
> case VIRTIO_VSOCK_OP_RST:
> @@ -1112,28 +1125,30 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
>
> - 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 = virtio_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,
> };
> @@ -1142,8 +1157,9 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> struct virtio_vsock_sock *vvs = vsk->trans;
> bool space_available;
> @@ -1158,8 +1174,8 @@ 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;
> @@ -1167,27 +1183,28 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> 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;
> }
>
> @@ -1198,10 +1215,10 @@ 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
> @@ -1209,17 +1226,17 @@ 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);
>
> @@ -1237,29 +1254,30 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct sockaddr_vm src, dst;
> struct vsock_sock *vsk;
> struct sock *sk;
> bool space_available;
>
> - 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;
> }
>
> @@ -1270,13 +1288,13 @@ 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;
> }
> @@ -1287,13 +1305,13 @@ 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)
> @@ -1304,23 +1322,23 @@ 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;
> }
>
> @@ -1333,16 +1351,42 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> return;
>
> free_pkt:
> - virtio_transport_free_pkt(pkt);
> + kfree_skb(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)
> {
> - kvfree(pkt->buf);
> - kfree(pkt);
> + struct sk_buff_head freeme;
> + struct sk_buff *skb, *tmp;
> + int cnt = 0;
> +
> + 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 (virtio_vsock_skb_reply(skb))
> + 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..671e03240fc5 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 +108,18 @@ 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;
> + struct sk_buff *skb;
> +
> + 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;
> -
> - 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);
> + while ((skb = __skb_dequeue(&pkts))) {
> + virtio_transport_deliver_tap_pkt(skb);
> + virtio_transport_recv_pkt(&loopback_transport, skb);
> }
> }
>
> @@ -148,7 +133,7 @@ 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 +151,13 @@ 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);
> - }
> + virtio_vsock_skb_queue_purge(&vsock->pkt_queue);
> spin_unlock_bh(&vsock->pkt_list_lock);
>
> destroy_workqueue(vsock->workqueue);
Acked-by: Paolo Abeni <pabeni@redhat.com>
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff
[not found] <20221215043645.3545127-1-bobby.eshleman@bytedance.com>
2022-12-15 8:47 ` [PATCH net-next v8] virtio/vsock: replace virtio_vsock_pkt with sk_buff Stefano Garzarella
2022-12-15 15:05 ` Paolo Abeni
@ 2023-01-05 9:49 ` Michael S. Tsirkin
[not found] ` <Y6DSqiv7cxdfCaQ/@bullseye>
2 siblings, 1 reply; 6+ messages in thread
From: Michael S. Tsirkin @ 2023-01-05 9:49 UTC (permalink / raw)
To: Bobby Eshleman
Cc: Bobby Eshleman, Cong Wang, Krasnov Arseniy, Jiang Wang, netdev,
linux-kernel, virtualization, Eric Dumazet, Stefan Hajnoczi, kvm,
Jakub Kicinski, Paolo Abeni, David S. Miller
On Thu, Dec 15, 2022 at 04:36:44AM +0000, Bobby Eshleman wrote:
> This commit changes virtio/vsock to use sk_buff instead of
> virtio_vsock_pkt. Beyond better conforming to other net code, using
> sk_buff allows vsock to use sk_buff-dependent features in the future
> (such as sockmap) and improves throughput.
Was causing syzbot crashes so I dropped this for now.
Please debug and post a fixed up patch. Thanks!
> This patch introduces the following performance changes:
>
> Tool/Config: uperf w/ 64 threads, SOCK_STREAM
> Test Runs: 5, mean of results
> Before: commit 95ec6bce2a0b ("Merge branch 'net-ipa-more-endpoints'")
>
> Test: 64KB, g2h
> Before: 21.63 Gb/s
> After: 25.59 Gb/s (+18%)
>
> Test: 16B, g2h
> Before: 11.86 Mb/s
> After: 17.41 Mb/s (+46%)
>
> Test: 64KB, h2g
> Before: 2.15 Gb/s
> After: 3.6 Gb/s (+67%)
>
> Test: 16B, h2g
> Before: 14.38 Mb/s
> After: 18.43 Mb/s (+28%)
>
> Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
> ---
>
> Testing: passed vsock_test h2g and g2h
> Note2: net-next is closed, but sending out now in case more comments
> roll in, as discussed here:
> https://lore.kernel.org/all/Y34SoH1nFTXXLWbK@bullseye/
>
> Changes in v8:
> - vhost/vsock: remove unused enum
> - vhost/vsock: use spin_lock_bh() instead of spin_lock()
> - vsock/loopback: use __skb_dequeue instead of skb_dequeue
>
> Changes in v7:
> - use skb_queue_empty() instead of skb_queue_empty_lockless()
>
> Changes in v6:
> - use skb->cb instead of skb->_skb_refdst
> - use lock-free __skb_queue_purge for rx_queue when rx_lock held
>
> Changes in v5:
> - last_skb instead of skb: last_hdr->len = cpu_to_le32(last_skb->len)
>
> Changes in v4:
> - vdso/bits.h -> linux/bits.h
> - add virtio_vsock_alloc_skb() helper
> - virtio/vsock: rename buf_len -> total_len
> - update last_hdr->len
> - fix build_skb() for vsockmon (tested)
> - add queue helpers
> - use spin_{unlock/lock}_bh() instead of spin_lock()/spin_unlock()
> - note: I only ran a few g2h tests to check that this change
> had no perf impact. The above data is still from patch
> v3.
>
> Changes in v3:
> - fix seqpacket bug
> - use zero in vhost_add_used(..., 0) device doesn't write to buffer
> - use xmas tree style declarations
> - vsock_hdr() -> virtio_vsock_hdr() and other include file style fixes
> - no skb merging
> - save space by not using vsock_metadata
> - use _skb_refdst instead of skb buffer space for flags
> - use skb_pull() to keep track of read bytes instead of using an an
> extra variable 'off' in the skb buffer space
> - remove unnecessary sk_allocation assignment
> - do not zero hdr needlessly
> - introduce virtio_transport_skb_len() because skb->len changes now
> - use spin_lock() directly on queue lock instead of sk_buff_head helpers
> which use spin_lock_irqsave() (e.g., skb_dequeue)
> - do not reduce buffer size to be page size divisible
> - Note: the biggest performance change came from loosening the spinlock
> variation and not reducing the buffer size.
>
> Changes in v2:
> - Use alloc_skb() directly instead of sock_alloc_send_pskb() to minimize
> uAPI changes.
> - Do not marshal errors to -ENOMEM for non-virtio implementations.
> - No longer a part of the original series
> - Some code cleanup and refactoring
> - Include performance stats
>
> drivers/vhost/vsock.c | 213 +++++-------
> include/linux/virtio_vsock.h | 126 +++++--
> net/vmw_vsock/virtio_transport.c | 149 +++------
> net/vmw_vsock/virtio_transport_common.c | 422 +++++++++++++-----------
> net/vmw_vsock/vsock_loopback.c | 51 +--
> 5 files changed, 495 insertions(+), 466 deletions(-)
>
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index 5703775af129..ee0a00432cb1 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;
>
> @@ -108,40 +107,33 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
> vhost_disable_notify(&vsock->dev, vq);
>
> do {
> - struct virtio_vsock_pkt *pkt;
> + struct virtio_vsock_hdr *hdr;
> + size_t iov_len, payload_len;
> struct iov_iter iov_iter;
> + u32 flags_to_restore = 0;
> + struct sk_buff *skb;
> unsigned out, in;
> size_t nbytes;
> - size_t iov_len, payload_len;
> 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);
> + spin_lock_bh(&vsock->send_pkt_queue.lock);
> + skb = __skb_dequeue(&vsock->send_pkt_queue);
> + spin_unlock_bh(&vsock->send_pkt_queue.lock);
> +
> + 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);
> + virtio_vsock_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);
> -
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> /* We cannot finish yet if more buffers snuck in while
> * re-enabling notify.
> */
> @@ -153,26 +145,27 @@ 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;
> + hdr = virtio_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 +178,30 @@ 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,
> - &iov_iter);
> + nbytes = copy_to_iter(skb->data, 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;
> + skb_pull(skb, 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 (skb->len > 0) {
> + 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);
> + virtio_vsock_skb_clear_tap_delivered(skb);
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> } else {
> - if (pkt->reply) {
> + if (virtio_vsock_skb_reply(skb)) {
> 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vhost_vsock *vsock;
> - int len = pkt->len;
> + int len = skb->len;
>
> 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 (virtio_vsock_skb_reply(skb))
> 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_vsock_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];
> @@ -352,12 +324,14 @@ 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 virtio_vsock_hdr *hdr;
> struct iov_iter iov_iter;
> + struct sk_buff *skb;
> + size_t payload_len;
> size_t nbytes;
> size_t len;
>
> @@ -366,50 +340,47 @@ 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 */
> + skb = virtio_vsock_alloc_skb(len, GFP_KERNEL);
> + if (!skb)
> return NULL;
>
> - len = iov_length(vq->iov, out);
> 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 = virtio_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);
> + payload_len = le32_to_cpu(hdr->len);
>
> /* No payload */
> - if (!pkt->len)
> - return pkt;
> + if (!payload_len)
> + return skb;
>
> /* The pkt is too big */
> - if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> - kfree(pkt);
> + if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
> + kfree_skb(skb);
> return NULL;
> }
>
> - pkt->buf = kvmalloc(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, payload_len, &iov_iter);
> + if (nbytes != payload_len) {
> + vq_err(vq, "Expected %zu byte payload, got %zu bytes\n",
> + payload_len, nbytes);
> + kfree_skb(skb);
> return NULL;
> }
>
> - return pkt;
> + return skb;
> }
>
> /* Is there space left for replies to rx packets? */
> @@ -496,9 +467,9 @@ 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;
> int head, pkts = 0, total_len = 0;
> unsigned int out, in;
> + struct sk_buff *skb;
> bool added = false;
>
> mutex_lock(&vq->mutex);
> @@ -511,6 +482,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
>
> vhost_disable_notify(&vsock->dev, vq);
> do {
> + struct virtio_vsock_hdr *hdr;
> +
> if (!vhost_vsock_more_replies(vsock)) {
> /* Stop tx until the device processes already
> * pending replies. Leave tx virtqueue
> @@ -532,24 +505,26 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
> break;
> }
>
> - pkt = vhost_vsock_alloc_pkt(vq, out, in);
> - if (!pkt) {
> + skb = vhost_vsock_alloc_skb(vq, out, in);
> + if (!skb) {
> vq_err(vq, "Faulted on pkt\n");
> continue;
> }
>
> - total_len += sizeof(pkt->hdr) + pkt->len;
> + total_len += sizeof(*hdr) + skb->len;
>
> /* Deliver to monitoring devices all received packets */
> - virtio_transport_deliver_tap_pkt(pkt);
> + virtio_transport_deliver_tap_pkt(skb);
> +
> + hdr = virtio_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);
> added = true;
> @@ -693,8 +668,7 @@ 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 +734,7 @@ 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);
> + virtio_vsock_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..7ed943615271 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -7,6 +7,106 @@
> #include <net/sock.h>
> #include <net/af_vsock.h>
>
> +#define VIRTIO_VSOCK_SKB_HEADROOM (sizeof(struct virtio_vsock_hdr))
> +
> +struct virtio_vsock_skb_cb {
> + bool reply;
> + bool tap_delivered;
> +};
> +
> +#define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb))
> +
> +static inline struct virtio_vsock_hdr *virtio_vsock_hdr(struct sk_buff *skb)
> +{
> + return (struct virtio_vsock_hdr *)skb->head;
> +}
> +
> +static inline bool virtio_vsock_skb_reply(struct sk_buff *skb)
> +{
> + return VIRTIO_VSOCK_SKB_CB(skb)->reply;
> +}
> +
> +static inline void virtio_vsock_skb_set_reply(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->reply = true;
> +}
> +
> +static inline bool virtio_vsock_skb_tap_delivered(struct sk_buff *skb)
> +{
> + return VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered;
> +}
> +
> +static inline void virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = true;
> +}
> +
> +static inline void virtio_vsock_skb_clear_tap_delivered(struct sk_buff *skb)
> +{
> + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = false;
> +}
> +
> +static inline void virtio_vsock_skb_rx_put(struct sk_buff *skb)
> +{
> + u32 len;
> +
> + len = le32_to_cpu(virtio_vsock_hdr(skb)->len);
> +
> + if (len > 0)
> + skb_put(skb, len);
> +}
> +
> +static inline struct sk_buff *virtio_vsock_alloc_skb(unsigned int size, gfp_t mask)
> +{
> + struct sk_buff *skb;
> +
> + skb = alloc_skb(size, mask);
> + if (!skb)
> + return NULL;
> +
> + skb_reserve(skb, VIRTIO_VSOCK_SKB_HEADROOM);
> + return skb;
> +}
> +
> +static inline void
> +virtio_vsock_skb_queue_head(struct sk_buff_head *list, struct sk_buff *skb)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_head(list, skb);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline void
> +virtio_vsock_skb_queue_tail(struct sk_buff_head *list, struct sk_buff *skb)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_tail(list, skb);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline struct sk_buff *virtio_vsock_skb_dequeue(struct sk_buff_head *list)
> +{
> + struct sk_buff *skb;
> +
> + spin_lock_bh(&list->lock);
> + skb = __skb_dequeue(list);
> + spin_unlock_bh(&list->lock);
> +
> + return skb;
> +}
> +
> +static inline void virtio_vsock_skb_queue_purge(struct sk_buff_head *list)
> +{
> + spin_lock_bh(&list->lock);
> + __skb_queue_purge(list);
> + spin_unlock_bh(&list->lock);
> +}
> +
> +static inline size_t virtio_vsock_skb_len(struct sk_buff *skb)
> +{
> + return (size_t)(skb_end_pointer(skb) - skb->head);
> +}
> +
> #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 +135,10 @@ 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 +155,7 @@ 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 +236,10 @@ 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 *list);
> #endif /* _LINUX_VIRTIO_VSOCK_H */
> diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
> index ad64f403536a..28b5a8e8e094 100644
> --- a/net/vmw_vsock/virtio_transport.c
> +++ b/net/vmw_vsock/virtio_transport.c
> @@ -42,8 +42,7 @@ 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 +100,31 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> vq = vsock->vqs[VSOCK_VQ_TX];
>
> for (;;) {
> - struct virtio_vsock_pkt *pkt;
> struct scatterlist hdr, buf, *sgs[2];
> int ret, in_sg = 0, out_sg = 0;
> + struct sk_buff *skb;
> 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);
> + skb = virtio_vsock_skb_dequeue(&vsock->send_pkt_queue);
> + if (!skb)
> 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);
>
> - virtio_transport_deliver_tap_pkt(pkt);
> + virtio_transport_deliver_tap_pkt(skb);
> + reply = virtio_vsock_skb_reply(skb);
>
> - reply = pkt->reply;
> -
> - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
> + sg_init_one(&hdr, virtio_vsock_hdr(skb), sizeof(*virtio_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);
> + virtio_vsock_skb_queue_head(&vsock->send_pkt_queue, skb);
> break;
> }
>
> @@ -164,32 +153,32 @@ virtio_transport_send_pkt_work(struct work_struct *work)
> }
>
> 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 = virtio_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 (virtio_vsock_skb_reply(skb))
> 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_vsock_skb_queue_tail(&vsock->send_pkt_queue, skb);
> queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
>
> out_rcu:
> @@ -201,9 +190,7 @@ 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 +199,7 @@ 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 +220,28 @@ 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];
> + int total_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE + VIRTIO_VSOCK_SKB_HEADROOM;
> + struct scatterlist pkt, *p;
> struct virtqueue *vq;
> + struct sk_buff *skb;
> int ret;
>
> vq = vsock->vqs[VSOCK_VQ_RX];
>
> do {
> - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
> - if (!pkt)
> + skb = virtio_vsock_alloc_skb(total_len, GFP_KERNEL);
> + if (!skb)
> break;
>
> - pkt->buf = kmalloc(buf_len, GFP_KERNEL);
> - if (!pkt->buf) {
> - virtio_transport_free_pkt(pkt);
> + memset(skb->head, 0, VIRTIO_VSOCK_SKB_HEADROOM);
> + sg_init_one(&pkt, virtio_vsock_hdr(skb), total_len);
> + p = &pkt;
> + ret = virtqueue_add_sgs(vq, &p, 0, 1, skb, GFP_KERNEL);
> + if (ret < 0) {
> + kfree_skb(skb);
> break;
> }
>
> - pkt->buf_len = buf_len;
> - pkt->len = buf_len;
> -
> - sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
> - sgs[0] = &hdr;
> -
> - 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);
> - break;
> - }
> vsock->rx_buf_nr++;
> } while (vq->num_free);
> if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
> @@ -299,12 +263,12 @@ 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 +493,7 @@ static void virtio_transport_rx_work(struct work_struct *work)
> do {
> virtqueue_disable_cb(vq);
> for (;;) {
> - struct virtio_vsock_pkt *pkt;
> + struct sk_buff *skb;
> unsigned int len;
>
> if (!virtio_transport_more_replies(vsock)) {
> @@ -540,23 +504,22 @@ 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(struct virtio_vsock_hdr) ||
> + len > virtio_vsock_skb_len(skb))) {
> + kfree_skb(skb);
> continue;
> }
>
> - pkt->len = len - sizeof(pkt->hdr);
> - virtio_transport_deliver_tap_pkt(pkt);
> - virtio_transport_recv_pkt(&virtio_transport, pkt);
> + 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 +573,7 @@ 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 +600,16 @@ 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);
> + virtio_vsock_skb_queue_purge(&vsock->send_pkt_queue);
>
> /* Delete virtqueues and flush outstanding callbacks if any */
> vdev->config->del_vqs(vdev);
> @@ -690,8 +646,7 @@ 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 a9980e9b9304..a1581c77cf84 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -37,53 +37,56 @@ 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)
> {
> - struct virtio_vsock_pkt *pkt;
> + const size_t skb_len = VIRTIO_VSOCK_SKB_HEADROOM + len;
> + struct virtio_vsock_hdr *hdr;
> + struct sk_buff *skb;
> + void *payload;
> int err;
>
> - pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
> - if (!pkt)
> + skb = virtio_vsock_alloc_skb(skb_len, GFP_KERNEL);
> + if (!skb)
> return NULL;
>
> - 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;
> + hdr = virtio_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) {
> - pkt->buf = kmalloc(len, GFP_KERNEL);
> - if (!pkt->buf)
> - goto out_pkt;
> -
> - pkt->buf_len = len;
> -
> - err = memcpy_from_msg(pkt->buf, info->msg, len);
> + payload = skb_put(skb, len);
> + err = memcpy_from_msg(payload, info->msg, len);
> if (err)
> 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)
> + virtio_vsock_skb_set_reply(skb);
> +
> trace_virtio_transport_alloc_pkt(src_cid, src_port,
> dst_cid, dst_port,
> len,
> @@ -91,19 +94,18 @@ 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 virtio_vsock_hdr *pkt_hdr;
> + struct sk_buff *pkt = opaque;
> struct af_vsockmon_hdr *hdr;
> struct sk_buff *skb;
> size_t payload_len;
> @@ -113,10 +115,11 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> * 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;
> + pkt_hdr = virtio_vsock_hdr(pkt);
> + payload_len = pkt->len;
> + payload_buf = pkt->data;
>
> - skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + payload_len,
> + skb = alloc_skb(sizeof(*hdr) + sizeof(*pkt_hdr) + payload_len,
> GFP_ATOMIC);
> if (!skb)
> return NULL;
> @@ -124,16 +127,16 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> 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->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));
> + hdr->len = cpu_to_le16(sizeof(*pkt_hdr));
> memset(hdr->reserved, 0, sizeof(hdr->reserved));
>
> - switch (le16_to_cpu(pkt->hdr.op)) {
> + 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);
> @@ -154,7 +157,7 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> break;
> }
>
> - skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr));
> + skb_put_data(skb, pkt_hdr, sizeof(*pkt_hdr));
>
> if (payload_len) {
> skb_put_data(skb, payload_buf, payload_len);
> @@ -163,13 +166,13 @@ static struct sk_buff *virtio_transport_build_skb(void *opaque)
> return skb;
> }
>
> -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 (virtio_vsock_skb_tap_delivered(skb))
> return;
>
> - vsock_deliver_tap(virtio_transport_build_skb, pkt);
> - pkt->tap_delivered = true;
> + vsock_deliver_tap(virtio_transport_build_skb, skb);
> + virtio_vsock_skb_set_tap_delivered(skb);
> }
> EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt);
>
> @@ -192,8 +195,8 @@ 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;
> u32 pkt_len = info->pkt_len;
> + struct sk_buff *skb;
>
> info->type = virtio_transport_get_type(sk_vsock(vsk));
>
> @@ -224,42 +227,47 @@ 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) {
> + if (!skb) {
> virtio_transport_put_credit(vvs, pkt_len);
> return -ENOMEM;
> }
>
> - virtio_transport_inc_tx_pkt(vvs, pkt);
> + virtio_transport_inc_tx_pkt(vvs, skb);
>
> - return t_ops->send_pkt(pkt);
> + return t_ops->send_pkt(skb);
> }
>
> 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;
> + int len;
> +
> + len = skb_headroom(skb) - sizeof(struct virtio_vsock_hdr) - skb->len;
> + vvs->rx_bytes -= len;
> + vvs->fwd_cnt += 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 = virtio_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 +311,29 @@ virtio_transport_stream_do_peek(struct vsock_sock *vsk,
> size_t len)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> - struct virtio_vsock_pkt *pkt;
> size_t bytes, total = 0, off;
> + struct sk_buff *skb, *tmp;
> 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 = 0;
>
> 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 +360,38 @@ virtio_transport_stream_do_dequeue(struct vsock_sock *vsk,
> size_t len)
> {
> struct virtio_vsock_sock *vvs = vsk->trans;
> - struct virtio_vsock_pkt *pkt;
> size_t bytes, total = 0;
> - u32 free_space;
> + struct sk_buff *skb;
> int err = -EFAULT;
> + u32 free_space;
>
> 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(&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)
> + bytes = skb->len;
>
> /* 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, 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);
> + skb_pull(skb, bytes);
> +
> + if (skb->len == 0) {
> + virtio_transport_dec_rx_pkt(vvs, skb);
> + consume_skb(skb);
> + } else {
> + __skb_queue_head(&vvs->rx_queue, skb);
> }
> }
>
> @@ -414,10 +423,10 @@ 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;
> int dequeued_len = 0;
> size_t user_buf_len = msg_data_left(msg);
> bool msg_ready = false;
> + struct sk_buff *skb;
>
> spin_lock_bh(&vvs->rx_lock);
>
> @@ -427,13 +436,18 @@ 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);
> + if (!skb)
> + break;
> + hdr = virtio_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 +458,7 @@ 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.
> @@ -452,6 +466,7 @@ static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk,
> dequeued_len = err;
> } else {
> user_buf_len -= bytes_to_copy;
> + skb_pull(skb, bytes_to_copy);
> }
>
> spin_lock_bh(&vvs->rx_lock);
> @@ -461,17 +476,16 @@ 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 +623,7 @@ 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;
> }
> @@ -806,16 +820,16 @@ 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(virtio_vsock_hdr(skb)->op) == VIRTIO_VSOCK_OP_RST)
> return 0;
>
> return virtio_transport_send_pkt_info(vsk, &info);
> @@ -825,29 +839,30 @@ 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 virtio_vsock_hdr *hdr = virtio_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,
> };
> + struct sk_buff *reply;
>
> /* 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));
> if (!reply)
> return -ENOMEM;
>
> if (!t) {
> - virtio_transport_free_pkt(reply);
> + kfree_skb(reply);
> return -ENOTCONN;
> }
>
> @@ -858,16 +873,11 @@ 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);
> }
>
> @@ -981,13 +991,14 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> - int err;
> int skerr;
> + int err;
>
> - 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;
> @@ -1008,7 +1019,7 @@ 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);
> @@ -1017,34 +1028,37 @@ 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;
> bool can_enqueue, free_pkt = false;
> + struct virtio_vsock_hdr *hdr;
> + u32 len;
>
> - pkt->len = le32_to_cpu(pkt->hdr.len);
> - pkt->off = 0;
> + hdr = virtio_vsock_hdr(skb);
> + len = le32_to_cpu(hdr->len);
>
> 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(&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 = virtio_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
> @@ -1052,35 +1066,35 @@ 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_EOM)) {
> + 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;
> + last_hdr->len = cpu_to_le32(last_skb->len);
> 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> 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);
> vsock_data_ready(sk);
> return err;
> case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
> @@ -1090,18 +1104,17 @@ 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(virtio_vsock_hdr(skb)->flags))
> sk->sk_state_change(sk);
> break;
> case VIRTIO_VSOCK_OP_RST:
> @@ -1112,28 +1125,30 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
>
> - 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 = virtio_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,
> };
> @@ -1142,8 +1157,9 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> struct virtio_vsock_sock *vvs = vsk->trans;
> bool space_available;
> @@ -1158,8 +1174,8 @@ 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;
> @@ -1167,27 +1183,28 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct vsock_sock *vsk = vsock_sk(sk);
> 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;
> }
>
> @@ -1198,10 +1215,10 @@ 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
> @@ -1209,17 +1226,17 @@ 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);
>
> @@ -1237,29 +1254,30 @@ 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 virtio_vsock_hdr *hdr = virtio_vsock_hdr(skb);
> struct sockaddr_vm src, dst;
> struct vsock_sock *vsk;
> struct sock *sk;
> bool space_available;
>
> - 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;
> }
>
> @@ -1270,13 +1288,13 @@ 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;
> }
> @@ -1287,13 +1305,13 @@ 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)
> @@ -1304,23 +1322,23 @@ 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;
> }
>
> @@ -1333,16 +1351,42 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
> return;
>
> free_pkt:
> - virtio_transport_free_pkt(pkt);
> + kfree_skb(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)
> {
> - kvfree(pkt->buf);
> - kfree(pkt);
> + struct sk_buff_head freeme;
> + struct sk_buff *skb, *tmp;
> + int cnt = 0;
> +
> + 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 (virtio_vsock_skb_reply(skb))
> + 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..671e03240fc5 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 +108,18 @@ 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;
> + struct sk_buff *skb;
> +
> + 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;
> -
> - 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);
> + while ((skb = __skb_dequeue(&pkts))) {
> + virtio_transport_deliver_tap_pkt(skb);
> + virtio_transport_recv_pkt(&loopback_transport, skb);
> }
> }
>
> @@ -148,7 +133,7 @@ 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 +151,13 @@ 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);
> - }
> + virtio_vsock_skb_queue_purge(&vsock->pkt_queue);
> spin_unlock_bh(&vsock->pkt_list_lock);
>
> destroy_workqueue(vsock->workqueue);
> --
> 2.20.1
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