[ovs-dev] [PATCH v2 16/16] ofp-actions: Add support for OpenFlow 1.5 (draft) Copy-Field action.

Jarno Rajahalme jrajahalme at nicira.com
Mon Aug 11 18:46:20 UTC 2014


Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>

On Aug 7, 2014, at 4:14 PM, Ben Pfaff <blp at nicira.com> wrote:

> ONF-JIRA: EXT-320
> Signed-off-by: Ben Pfaff <blp at nicira.com>
> ---
> NEWS                 |    1 +
> lib/ofp-actions.c    |   80 ++++++++++++++++++++++++++++++++++++++++++--------
> tests/ofp-actions.at |   24 +++++++++++++++
> 3 files changed, 93 insertions(+), 12 deletions(-)
> 
> diff --git a/NEWS b/NEWS
> index 94232b7..15abe45 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -14,6 +14,7 @@ Post-v2.3.0
>      release.  See ovs-vswitchd(8) for details.
>    - OpenFlow:
>      * OpenFlow 1.5 (draft) extended registers are now supported.
> +     * OpenFlow 1.5 (draft) Copy-Field action is now supported.
>      * OpenFlow 1.3+ table features requests are now supported (read-only).
> 
> 
> diff --git a/lib/ofp-actions.c b/lib/ofp-actions.c
> index 3799cfd..e2266cd 100644
> --- a/lib/ofp-actions.c
> +++ b/lib/ofp-actions.c
> @@ -206,6 +206,11 @@ enum ofp_raw_action_type {
>     /* NX1.0+(7): struct nx_action_reg_load. */
>     NXAST_RAW_REG_LOAD,
> 
> +    /* OF1.5+(28): struct ofp15_action_copy_field. */
> +    OFPAT_RAW15_COPY_FIELD,
> +    /* NX1.0-1.4(6): struct nx_action_reg_move. */
> +    NXAST_RAW_REG_MOVE,
> +
> /* ## ------------------------- ## */
> /* ## Nicira extension actions. ## */
> /* ## ------------------------- ## */
> @@ -225,9 +230,6 @@ enum ofp_raw_action_type {
>     /* NX1.0+(5): void. */
>     NXAST_RAW_POP_QUEUE,
> 
> -    /* NX1.0+(6): struct nx_action_reg_move. */
> -    NXAST_RAW_REG_MOVE,
> -
>     /* NX1.0+(8): struct nx_action_note, ... */
>     NXAST_RAW_NOTE,
> 
> @@ -1622,6 +1624,26 @@ format_SET_L4_DST_PORT(const struct ofpact_l4_port *a, struct ds *s)
>     ds_put_format(s, "mod_tp_dst:%d", a->port);
> }
> 
> +/* Action structure for OFPAT_COPY_FIELD. */
> +struct ofp15_action_copy_field {
> +    ovs_be16 type;              /* OFPAT_COPY_FIELD. */
> +    ovs_be16 len;               /* Length is padded to 64 bits. */
> +    ovs_be16 n_bits;            /* Number of bits to copy. */
> +    ovs_be16 src_offset;        /* Starting bit offset in source. */
> +    ovs_be16 dst_offset;        /* Starting bit offset in destination. */
> +    ovs_be16 oxm_id_len;        /* Length of oxm_ids. */
> +
> +    /* OpenFlow allows for experimenter OXM fields whose expression is longer
> +     * than a standard 32-bit OXM.  Thus, in the OpenFlow specification, the
> +     * following is variable-length.  Open vSwitch does not yet support
> +     * experimenter OXM fields, so until it does we leave these as fixed
> +     * size. */
> +    ovs_be32 src;               /* OXM for source field. */
> +    ovs_be32 dst;               /* OXM for destination field. */
> +    uint8_t pad[4];             /* Must be zero. */
> +};
> +OFP_ASSERT(sizeof(struct ofp15_action_copy_field) == 24);
> +
> /* Action structure for NXAST_REG_MOVE.
>  *
>  * Copies src[src_ofs:src_ofs+n_bits] to dst[dst_ofs:dst_ofs+n_bits], where
> @@ -1728,6 +1750,29 @@ struct nx_action_reg_move {
> OFP_ASSERT(sizeof(struct nx_action_reg_move) == 24);
> 
> static enum ofperr
> +decode_OFPAT_RAW15_COPY_FIELD(const struct ofp15_action_copy_field *oacf,
> +                              struct ofpbuf *ofpacts)
> +{
> +    struct ofpact_reg_move *move;
> +
> +    if (oacf->oxm_id_len != htons(8)) {
> +        /* We only support 4-byte OXM IDs so far. */
> +        return OFPERR_OFPBAC_BAD_LEN;
> +    }
> +
> +    move = ofpact_put_REG_MOVE(ofpacts);
> +    move->ofpact.raw = OFPAT_RAW15_COPY_FIELD;
> +    move->src.field = mf_from_nxm_header(ntohl(oacf->src));
> +    move->src.ofs = ntohs(oacf->src_offset);
> +    move->src.n_bits = ntohs(oacf->n_bits);
> +    move->dst.field = mf_from_nxm_header(ntohl(oacf->dst));
> +    move->dst.ofs = ntohs(oacf->dst_offset);
> +    move->dst.n_bits = ntohs(oacf->n_bits);
> +
> +    return nxm_reg_move_check(move, NULL);
> +}
> +
> +static enum ofperr
> decode_NXAST_RAW_REG_MOVE(const struct nx_action_reg_move *narm,
>                           struct ofpbuf *ofpacts)
> {
> @@ -1746,17 +1791,28 @@ decode_NXAST_RAW_REG_MOVE(const struct nx_action_reg_move *narm,
> 
> static void
> encode_REG_MOVE(const struct ofpact_reg_move *move,
> -                enum ofp_version ofp_version OVS_UNUSED,
> -                struct ofpbuf *out)
> +                enum ofp_version ofp_version, struct ofpbuf *out)
> {
> -    struct nx_action_reg_move *narm;
> +    if (ofp_version >= OFP15_VERSION) {
> +        struct ofp15_action_copy_field *copy;
> 
> -    narm = put_NXAST_REG_MOVE(out);
> -    narm->n_bits = htons(move->dst.n_bits);
> -    narm->src_ofs = htons(move->src.ofs);
> -    narm->dst_ofs = htons(move->dst.ofs);
> -    narm->src = htonl(move->src.field->nxm_header);
> -    narm->dst = htonl(move->dst.field->nxm_header);
> +        copy = put_OFPAT15_COPY_FIELD(out);
> +        copy->n_bits = htons(move->dst.n_bits);
> +        copy->src_offset = htons(move->src.ofs);
> +        copy->dst_offset = htons(move->dst.ofs);
> +        copy->oxm_id_len = htons(8);
> +        copy->src = htonl(mf_oxm_header(move->src.field->id, ofp_version));
> +        copy->dst = htonl(mf_oxm_header(move->dst.field->id, ofp_version));
> +    } else {
> +        struct nx_action_reg_move *narm;
> +
> +        narm = put_NXAST_REG_MOVE(out);
> +        narm->n_bits = htons(move->dst.n_bits);
> +        narm->src_ofs = htons(move->src.ofs);
> +        narm->dst_ofs = htons(move->dst.ofs);
> +        narm->src = htonl(move->src.field->nxm_header);
> +        narm->dst = htonl(move->dst.field->nxm_header);
> +    }
> }
> 
> static char * WARN_UNUSED_RESULT
> diff --git a/tests/ofp-actions.at b/tests/ofp-actions.at
> index 9c6f228..569f4ae 100644
> --- a/tests/ofp-actions.at
> +++ b/tests/ofp-actions.at
> @@ -502,6 +502,30 @@ AT_CHECK(
>   [0], [expout], [experr])
> AT_CLEANUP
> 
> +dnl Our primary goal here is to verify that the copy_field action gets
> +dnl used instead of the Nicira extension reg_move in OpenFlow 1.5, so
> +dnl the list of action tests is very short.
> +AT_SETUP([OpenFlow 1.5 action translation])
> +AT_KEYWORDS([ofp-actions OF1.5])
> +AT_DATA([test-data], [dnl
> +# actions=LOCAL
> +0000 0010 fffffffe 04d2 000000000000
> +
> +# actions=move:NXM_OF_IN_PORT[]->NXM_OF_VLAN_TCI[]
> +001c 0018 0010 0000 0000 0008 00000002 00000802 00000000
> +
> +])
> +sed '/^[[#&]]/d' < test-data > input.txt
> +sed -n 's/^# //p; /^$/p' < test-data > expout
> +sed -n 's/^& //p' < test-data > experr
> +AT_CAPTURE_FILE([input.txt])
> +AT_CAPTURE_FILE([expout])
> +AT_CAPTURE_FILE([experr])
> +AT_CHECK(
> +  [ovs-ofctl '-vPATTERN:console:%c|%p|%m' parse-actions OpenFlow15 < input.txt],
> +  [0], [expout], [experr])
> +AT_CLEANUP
> +
> AT_SETUP([ofp-actions - inconsistent MPLS actions])
> OVS_VSWITCHD_START
> dnl OK: Use fin_timeout action on TCP flow
> -- 
> 1.7.10.4
> 
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