I think Pravin will need to take a look in case he has something in the
pipeline that might conflict with this.
On my part:
Acked-by: Jarno Rajahalme <jrajaha...@nicira.com>
Jarno
On Jun 3, 2014, at 10:33 AM, Ryan Wilson <wr...@nicira.com> wrote:
> When a bridge of datatype type netdev receives a packet, it copies the
> packet from the NIC to a buffer in userspace. Currently, when making
> an upcall, the packet is again copied to the upcall's buffer. However,
> this extra copy is not necessary when the datapath exists in userspace
> as the upcall can directly access the packet data.
>
> This patch eliminates this extra copy of the packet data in most cases.
> In cases where the packet may still be used later by callers of
> dp_netdev_execute_actions, making a copy of the packet data is still
> necessary.
>
> Signed-off-by: Ryan Wilson <wr...@nicira.com>
> ---
> v2: Addressed Jarno's comment to use direct pointer assignment for
> upcall->packet instead of ofpbuf_set().
> ---
> lib/dpif-netdev.c | 15 +++++----------
> 1 file changed, 5 insertions(+), 10 deletions(-)
>
> diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
> index 91c83d6..c89ae20 100644
> --- a/lib/dpif-netdev.c
> +++ b/lib/dpif-netdev.c
> @@ -2024,7 +2024,6 @@ dp_netdev_input(struct dp_netdev *dp, struct ofpbuf
> *packet,
> miniflow_hash_5tuple(&key.flow, 0)
> % dp->n_handlers,
> DPIF_UC_MISS, &key.flow, NULL);
> - ofpbuf_delete(packet);
> }
> }
>
> @@ -2063,7 +2062,6 @@ dp_netdev_output_userspace(struct dp_netdev *dp, struct
> ofpbuf *packet,
> if (userdata) {
> buf_size += NLA_ALIGN(userdata->nla_len);
> }
> - buf_size += ofpbuf_size(packet);
> ofpbuf_init(buf, buf_size);
>
> /* Put ODP flow. */
> @@ -2078,15 +2076,14 @@ dp_netdev_output_userspace(struct dp_netdev *dp,
> struct ofpbuf *packet,
> NLA_ALIGN(userdata->nla_len));
> }
>
> - ofpbuf_set_data(&upcall->packet,
> - ofpbuf_put(buf, ofpbuf_data(packet),
> ofpbuf_size(packet)));
> - ofpbuf_set_size(&upcall->packet, ofpbuf_size(packet));
> + upcall->packet = *packet;
>
> seq_change(q->seq);
>
> error = 0;
> } else {
> dp_netdev_count_packet(dp, DP_STAT_LOST);
> + ofpbuf_delete(packet);
> error = ENOBUFS;
> }
> ovs_mutex_unlock(&q->mutex);
> @@ -2120,19 +2117,17 @@ dp_execute_cb(void *aux_, struct ofpbuf *packet,
> break;
>
> case OVS_ACTION_ATTR_USERSPACE: {
> + struct ofpbuf *userspace_packet;
> const struct nlattr *userdata;
>
> userdata = nl_attr_find_nested(a, OVS_USERSPACE_ATTR_USERDATA);
> + userspace_packet = may_steal ? packet : ofpbuf_clone(packet);
>
> - dp_netdev_output_userspace(aux->dp, packet,
> + dp_netdev_output_userspace(aux->dp, userspace_packet,
> miniflow_hash_5tuple(aux->key, 0)
> % aux->dp->n_handlers,
> DPIF_UC_ACTION, aux->key,
> userdata);
> -
> - if (may_steal) {
> - ofpbuf_delete(packet);
> - }
> break;
> }
>
> --
> 1.7.9.5
>
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