Re: [PATCH 05/10] Optimize the function of packet_new

[Lukas Straub <lukasstraub2@web.de>]

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On Wed, 13 Jan 2021 10:46:30 +0800
leirao <lei.rao@intel.com> wrote:

> From: "Rao, Lei" <lei.rao@intel.com>
> 
> if we put the data copy outside the packet_new(), then for the
> filter-rewrite module, there will be one less memory copy in the
> processing of each network packet.
> 
> Signed-off-by: Lei Rao <lei.rao@intel.com>

Looks good to me,

Reviewed-by: Lukas Straub <lukasstraub2@web.de>

> ---
>  net/colo-compare.c    | 7 +++++--
>  net/colo.c            | 4 ++--
>  net/colo.h            | 2 +-
>  net/filter-rewriter.c | 1 -
>  4 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/net/colo-compare.c b/net/colo-compare.c
> index 9e18baa..8bdf5a8 100644
> --- a/net/colo-compare.c
> +++ b/net/colo-compare.c
> @@ -247,14 +247,17 @@ static int packet_enqueue(CompareState *s, int mode, Connection **con)
>      ConnectionKey key;
>      Packet *pkt = NULL;
>      Connection *conn;
> +    char *data = NULL;
>      int ret;
>  
>      if (mode == PRIMARY_IN) {
> -        pkt = packet_new(s->pri_rs.buf,
> +        data = g_memdup(s->pri_rs.buf, s->pri_rs.packet_len);
> +        pkt = packet_new(data,
>                           s->pri_rs.packet_len,
>                           s->pri_rs.vnet_hdr_len);
>      } else {
> -        pkt = packet_new(s->sec_rs.buf,
> +        data = g_memdup(s->sec_rs.buf, s->sec_rs.packet_len);
> +        pkt = packet_new(data,
>                           s->sec_rs.packet_len,
>                           s->sec_rs.vnet_hdr_len);
>      }
> diff --git a/net/colo.c b/net/colo.c
> index ef00609..08fb37e 100644
> --- a/net/colo.c
> +++ b/net/colo.c
> @@ -155,11 +155,11 @@ void connection_destroy(void *opaque)
>      g_slice_free(Connection, conn);
>  }
>  
> -Packet *packet_new(const void *data, int size, int vnet_hdr_len)
> +Packet *packet_new(void *data, int size, int vnet_hdr_len)
>  {
>      Packet *pkt = g_slice_new(Packet);
>  
> -    pkt->data = g_memdup(data, size);
> +    pkt->data = data;
>      pkt->size = size;
>      pkt->creation_ms = qemu_clock_get_ms(QEMU_CLOCK_HOST);
>      pkt->vnet_hdr_len = vnet_hdr_len;
> diff --git a/net/colo.h b/net/colo.h
> index 573ab91..bd2d719 100644
> --- a/net/colo.h
> +++ b/net/colo.h
> @@ -100,7 +100,7 @@ Connection *connection_get(GHashTable *connection_track_table,
>  bool connection_has_tracked(GHashTable *connection_track_table,
>                              ConnectionKey *key);
>  void connection_hashtable_reset(GHashTable *connection_track_table);
> -Packet *packet_new(const void *data, int size, int vnet_hdr_len);
> +Packet *packet_new(void *data, int size, int vnet_hdr_len);
>  void packet_destroy(void *opaque, void *user_data);
>  void packet_destroy_partial(void *opaque, void *user_data);
>  
> diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c
> index fc0e64c..e24afe5 100644
> --- a/net/filter-rewriter.c
> +++ b/net/filter-rewriter.c
> @@ -271,7 +271,6 @@ static ssize_t colo_rewriter_receive_iov(NetFilterState *nf,
>      }
>  
>      pkt = packet_new(buf, size, vnet_hdr_len);
> -    g_free(buf);
>  
>      /*
>       * if we get tcp packet



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