[PATCH v4] lib/net: add MPLS insert and strip functionality

[Tanzeel Ahmed]

Ping.

On Thu, Mar 9, 2023 at 11:35 PM Tanzeel Ahmed <tanxeel1.ahmed at gmail.com>
wrote:

> Any updates?
>
>
> On Sat, Feb 25, 2023 at 6:53 PM Tanzeel-inline <tanxeel1.ahmed at gmail.com>
> wrote:
>
>> From: Tanzeel Ahmed <tanxeel1.ahmed at gmail.com>
>>
>> This patch is new version of [PATCH] lib/net: added push MPLS header API.
>> I have also added the MPLS strip functionality to address the question
>> asked in last patch.
>>
>> > You should explain why you add this function.
>> None of the foundational NICs currently supports MPLS insertion and
>> stripping, this functionality can help users who rely on MPLS in their
>> network application.
>>
>> > I'm not sure it should be inline
>> I did for performance in high-traffic application.
>>
>> Signed-off-by: Tanzeel Ahmed <tanxeel1.ahmed at gmail.com>
>>
>> ---
>> v4:
>> * Removed extra void cast.
>> * rte_pktmbuf_append/mtod now return void*.
>>   The memmove result is casted to rte_ether_hdr*.
>>
>> v3:
>> * fixed patch check failure issue
>>
>> v2:
>> * marked experimental
>> * coding style fixed
>> * changed rte_memcpy to memcpy
>> * mpls header marked as const in parameter
>> * added MPLS stripping functionality
>> ---
>>  .mailmap           |  1 +
>>  lib/net/rte_mpls.h | 97
>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 98 insertions(+)
>>
>> diff --git a/.mailmap b/.mailmap
>> index a9f4f28..2af4e0d 100644
>> --- a/.mailmap
>> +++ b/.mailmap
>> @@ -1312,6 +1312,7 @@ Takeshi Yoshimura <tyos at jp.ibm.com> <
>> t.yoshimura8869 at gmail.com>
>>  Takuya Asada <syuu at cloudius-systems.com>
>>  Tal Avraham <talavr at annapurnalabs.com>
>>  Tal Shnaiderman <talshn at nvidia.com> <talshn at mellanox.com>
>> +Tanzeel Ahmed <tanxeel1.ahmed at gmail.com>
>>  Tao Y Yang <tao.y.yang at intel.com>
>>  Tao Zhu <taox.zhu at intel.com>
>>  Taripin Samuel <samuel.taripin at intel.com>
>> diff --git a/lib/net/rte_mpls.h b/lib/net/rte_mpls.h
>> index 51523e7..d7e267f 100644
>> --- a/lib/net/rte_mpls.h
>> +++ b/lib/net/rte_mpls.h
>> @@ -13,6 +13,8 @@
>>
>>  #include <stdint.h>
>>  #include <rte_byteorder.h>
>> +#include <rte_ether.h>
>> +#include <rte_mbuf.h>
>>
>>  #ifdef __cplusplus
>>  extern "C" {
>> @@ -36,6 +38,101 @@ struct rte_mpls_hdr {
>>         uint8_t  ttl;       /**< Time to live. */
>>  } __rte_packed;
>>
>> +#define RTE_MPLS_HLEN 4 /**< Length of MPLS header. */
>> +
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change without prior notice.
>> + *
>> + * Insert MPLS header into the packet.
>> + * If it's first MPLS header to be inserted in the packet,
>> + *  - Updates the ether type.
>> + *  - Sets the MPLS bottom-of-stack bit to 1.
>> + *
>> + * @param m
>> + *   The pointer to the mbuf.
>> + * @param mp
>> + *   The pointer to the MPLS header.
>> + * @return
>> + *   0 on success, -1 on error
>> + */
>> +__rte_experimental
>> +static inline int
>> +rte_mpls_push_over_l2(struct rte_mbuf **m, const struct rte_mpls_hdr *mp)
>> +{
>> +       void *os, *ns;
>> +       struct rte_ether_hdr *nh;
>> +       struct rte_mpls_hdr *mph;
>> +
>> +       /* Can't insert header if mbuf is shared */
>> +       if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
>> +               return -EINVAL;
>> +
>> +       /* Can't insert header if ethernet frame doesn't exist */
>> +       if (rte_pktmbuf_data_len(*m) < RTE_ETHER_HDR_LEN)
>> +               return -EINVAL;
>> +
>> +       os = rte_pktmbuf_mtod(*m, void *);
>> +       ns = (void *)rte_pktmbuf_prepend(*m, sizeof(struct rte_mpls_hdr));
>> +       if (ns == NULL)
>> +               return -ENOSPC;
>> +
>> +       nh = (struct rte_ether_hdr *)memmove(ns, os, RTE_ETHER_HDR_LEN);
>> +
>> +       /* Copy the MPLS header after ethernet frame */
>> +       mph = rte_pktmbuf_mtod_offset(*m, struct rte_mpls_hdr*,
>> +                       sizeof(struct rte_ether_hdr));
>> +       memcpy(mph, mp, RTE_MPLS_HLEN);
>> +
>> +       mph->tag_msb = rte_cpu_to_be_16(mp->tag_msb);
>> +
>> +       /* If first MPLS header, update ether type and bottom-of-stack
>> bit */
>> +       if (nh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_MPLS)) {
>> +               nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_MPLS);
>> +               mph->bs = 1;
>> +       } else {
>> +               mph->bs = 0;
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change without prior notice.
>> + *
>> + * Strips MPLS from the packet. Doesn't update the ether type
>> + *
>> + * @param m
>> + *   The pointer to the mbuf.
>> + * @return
>> + *   0 on success, -1 on error
>> + */
>> +__rte_experimental
>> +static inline int
>> +rte_mpls_strip_over_l2(struct rte_mbuf *m)
>> +{
>> +       struct rte_ether_hdr *eh = rte_pktmbuf_mtod(m, struct
>> rte_ether_hdr *);
>> +       struct rte_mpls_hdr *mph;
>> +       bool mpls_exist = true;
>> +
>> +       if (eh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_MPLS))
>> +               return -1;
>> +
>> +       /* Stripping all MPLS header */
>> +       while (mpls_exist) {
>> +               mph = rte_pktmbuf_mtod_offset(m, struct rte_mpls_hdr*,
>> +               sizeof(struct rte_ether_hdr));
>> +               if (mph->bs & 1)
>> +                       mpls_exist = false;
>> +               memmove(rte_pktmbuf_adj(m, sizeof(struct rte_mpls_hdr)),
>> +               eh, sizeof(struct rte_ether_hdr));
>> +               eh = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
>> +       }
>> +
>> +       return 0;
>> +}
>> +
>>  #ifdef __cplusplus
>>  }
>>  #endif
>> --
>> 1.8.3.1
>>
>>
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