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* pfifo_fast: drop unneeded additional lock on dequeuePaolo Abeni2018-05-171-0/+5
| | | | | | | | | After the previous patch, for NOLOCK qdiscs, q->seqlock is always held when the dequeue() is invoked, we can drop any additional locking to protect such operation. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: use __ptr_ring_emptyMichael S. Tsirkin2018-01-291-1/+1
| | | | | | | | __skb_array_empty should use __ptr_ring_empty since that's the only legal lockless function. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: skb_array: expose peek APIJohn Fastabend2017-12-081-0/+5
| | | | | | | This adds a peek routine to skb_array.h for use with qdisc. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ptr_ring: use kmalloc_array()Eric Dumazet2017-08-161-1/+2
| | | | | | | | | | | | | | | As found by syzkaller, malicious users can set whatever tx_queue_len on a tun device and eventually crash the kernel. Lets remove the ALIGN(XXX, SMP_CACHE_BYTES) thing since a small ring buffer is not fast anyway. Fixes: 2e0ab8ca83c1 ("ptr_ring: array based FIFO for pointers") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Dmitry Vyukov <dvyukov@google.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: introduce batch dequeuingJason Wang2017-05-181-0/+25
| | | | | Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: introduce skb_array_unconsumeJason Wang2017-05-181-0/+6
| | | | | Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: add wrappers for resizingJason Wang2016-07-011-0/+9
| | | | | | Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: minor tweakJason Wang2016-07-011-2/+2
| | | | | | Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: resize supportMichael S. Tsirkin2016-06-151-4/+29
| | | | | | | | | Update skb_array after ptr_ring API changes. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* skb_array: array based FIFO for skbsMichael S. Tsirkin2016-06-151-0/+144
A simple array based FIFO of pointers. Intended for net stack so uses skbs for type safety. Implemented as a set of wrappers around ptr_ring. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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