> -----Original Message-----
> From: [email protected] [mailto:lng-odp-
> [email protected]] On Behalf Of ext Bill Fischofer
> Sent: Wednesday, December 17, 2014 3:57 AM
> To: [email protected]
> Subject: [lng-odp] [PATCHv2] linux-generic: packet: streamline packet
> add/rem data
>
> Ensure packet perser metadata is copied from old to new packet as part of
> add/rem data operations that omit packet reparsing.
>
> Signed-off-by: Bill Fischofer <[email protected]>
> ---
> v2 Ensures that parser metadata is copied if we're not reparsing
>
> platform/linux-generic/include/odp_packet_internal.h | 20
> ++++++++++++++++++++
> platform/linux-generic/odp_packet.c | 12 ++++++++++--
> 2 files changed, 30 insertions(+), 2 deletions(-)
>
> diff --git a/platform/linux-generic/include/odp_packet_internal.h
> b/platform/linux-generic/include/odp_packet_internal.h
> index 068f969..54a12b5 100644
> --- a/platform/linux-generic/include/odp_packet_internal.h
> +++ b/platform/linux-generic/include/odp_packet_internal.h
> @@ -187,6 +187,26 @@ static inline void packet_init(pool_entry_t *pool,
> (pool->s.headroom + size);
> }
>
> +static inline void copy_packet_parser_metadata(odp_packet_hdr_t *src_hdr,
> + odp_packet_hdr_t *dst_hdr)
> +{
> + dst_hdr->input_flags = src_hdr->input_flags;
> + dst_hdr->error_flags = src_hdr->error_flags;
> + dst_hdr->output_flags = src_hdr->output_flags;
> +
> + dst_hdr->l2_offset = src_hdr->l2_offset;
> + dst_hdr->l3_offset = src_hdr->l3_offset;
> + dst_hdr->l4_offset = src_hdr->l4_offset;
> + dst_hdr->payload_offset = src_hdr->payload_offset;
> +
> + dst_hdr->vlan_s_tag = src_hdr->vlan_s_tag;
> + dst_hdr->vlan_c_tag = src_hdr->vlan_c_tag;
> + dst_hdr->l3_protocol = src_hdr->l3_protocol;
> + dst_hdr->l3_len = src_hdr->l3_len;
> + dst_hdr->l4_protocol = src_hdr->l4_protocol;
> + dst_hdr->l4_len = src_hdr->l4_len;
> +}
> +
> static inline void *packet_map(odp_packet_hdr_t *pkt_hdr,
> uint32_t offset, uint32_t *seglen)
> {
> diff --git a/platform/linux-generic/odp_packet.c b/platform/linux-
> generic/odp_packet.c
> index 65e6288..43a9419 100644
> --- a/platform/linux-generic/odp_packet.c
> +++ b/platform/linux-generic/odp_packet.c
> @@ -396,12 +396,16 @@ odp_packet_t odp_packet_add_data(odp_packet_t pkt,
> uint32_t offset,
> newpkt = ODP_PACKET_INVALID;
> } else {
> odp_packet_hdr_t *new_hdr = odp_packet_hdr(newpkt);
> + new_hdr->input = pkt_hdr->input;
> new_hdr->buf_hdr.buf_u64 = pkt_hdr->buf_hdr.buf_u64;
> odp_atomic_store_u32(
> &new_hdr->buf_hdr.ref_count,
> odp_atomic_load_u32(
> &pkt_hdr->buf_hdr.ref_count));
> - _odp_packet_parse(newpkt);
> + if (offset < pkt_hdr->payload_offset)
> + _odp_packet_parse(newpkt);
" Handles and pointers must be updated
after the operation. User is responsible to update packet meta-data offsets
when needed."
The operation must not parse the packet again and thus overwrite existing
meta-data. E.g. application may have removed all the headers from the packet at
this point.
Just copy old meta-data to the new packet. From application point of view this
operation just added packet length at the offset and returned a new handle to
the same packet. Application will update offsets/flags as needed.
-Petri
> + else
> + copy_packet_parser_metadata(pkt_hdr, new_hdr);
> odp_packet_free(pkt);
> }
> }
> @@ -431,12 +435,16 @@ odp_packet_t odp_packet_rem_data(odp_packet_t pkt,
> uint32_t offset,
> newpkt = ODP_PACKET_INVALID;
> } else {
> odp_packet_hdr_t *new_hdr = odp_packet_hdr(newpkt);
> + new_hdr->input = pkt_hdr->input;
> new_hdr->buf_hdr.buf_u64 = pkt_hdr->buf_hdr.buf_u64;
> odp_atomic_store_u32(
> &new_hdr->buf_hdr.ref_count,
> odp_atomic_load_u32(
> &pkt_hdr->buf_hdr.ref_count));
> - _odp_packet_parse(newpkt);
> + if (offset < pkt_hdr->payload_offset)
> + _odp_packet_parse(newpkt);
> + else
> + copy_packet_parser_metadata(pkt_hdr, new_hdr);
> odp_packet_free(pkt);
> }
> }
> --
> 1.8.3.2
>
>
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