> -----Original Message-----
> From: Zeng, ZhichaoX <zhichaox.z...@intel.com>
> Sent: Thursday, December 21, 2023 3:28 PM
> To: dev@dpdk.org
> Cc: Zhang, Qi Z <qi.z.zh...@intel.com>; Zeng, ZhichaoX
> <zhichaox.z...@intel.com>; Wu, Jingjing <jingjing...@intel.com>; Xing, Beilei
> <beilei.x...@intel.com>
> Subject: [PATCH v4 1/3] net/iavf: support Tx LLDP on scalar
>
> This patch adds an mbuf dynfield IAVF_TX_LLDP_DYNFIELD to determine
> whether or not to fill the SWTCH_UPLINK bit in the Tx context descriptor to
> send LLDP packet.
>
> Signed-off-by: Zhichao Zeng <zhichaox.z...@intel.com>
> ---
> drivers/net/iavf/iavf_ethdev.c | 1 +
> drivers/net/iavf/iavf_rxtx.c | 16 ++++++++++++++--
> drivers/net/iavf/iavf_rxtx.h | 3 +++
> 3 files changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/iavf/iavf_ethdev.c b/drivers/net/iavf/iavf_ethdev.c
> index
> d1edb0dd5c..1be248926c 100644
> --- a/drivers/net/iavf/iavf_ethdev.c
> +++ b/drivers/net/iavf/iavf_ethdev.c
> @@ -41,6 +41,7 @@
> #define IAVF_NO_POLL_ON_LINK_DOWN_ARG "no-poll-on-link-down"
> uint64_t iavf_timestamp_dynflag;
> int iavf_timestamp_dynfield_offset = -1;
> +int iavf_tx_lldp_dynfield_offset = -1;
>
> static const char * const iavf_valid_args[] = {
> IAVF_PROTO_XTR_ARG,
> diff --git a/drivers/net/iavf/iavf_rxtx.c b/drivers/net/iavf/iavf_rxtx.c index
> f19aa14646..3107102911 100644
> --- a/drivers/net/iavf/iavf_rxtx.c
> +++ b/drivers/net/iavf/iavf_rxtx.c
> @@ -2418,8 +2418,9 @@ iavf_xmit_cleanup(struct iavf_tx_queue *txq)
>
> /* Check if the context descriptor is needed for TX offloading */ static
> inline
> uint16_t -iavf_calc_context_desc(uint64_t flags, uint8_t vlan_flag)
> +iavf_calc_context_desc(struct rte_mbuf *mb, uint8_t vlan_flag)
> {
> + uint64_t flags = mb->ol_flags;
> if (flags & (RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG |
> RTE_MBUF_F_TX_TUNNEL_MASK |
> RTE_MBUF_F_TX_OUTER_IP_CKSUM |
> RTE_MBUF_F_TX_OUTER_UDP_CKSUM))
> @@ -2427,6 +2428,12 @@ iavf_calc_context_desc(uint64_t flags, uint8_t
> vlan_flag)
> if (flags & RTE_MBUF_F_TX_VLAN &&
> vlan_flag & IAVF_TX_FLAGS_VLAN_TAG_LOC_L2TAG2)
> return 1;
> +
> + if (iavf_tx_lldp_dynfield_offset ==
> + rte_mbuf_dynfield_lookup(IAVF_TX_LLDP_DYNFIELD, NULL))
> + if (*RTE_MBUF_DYNFIELD(mb,
Its not necessary to lookup the dynamic field at data path which consume
considerable CPU cycles that impact the performance.
the dynamic field offset can be decided during dev_start.
> + iavf_tx_lldp_dynfield_offset, uint8_t *) > 0)
> + return 1;
> return 0;
> }
>
> @@ -2446,6 +2453,11 @@ iavf_fill_ctx_desc_cmd_field(volatile uint64_t
> *field, struct rte_mbuf *m,
> << IAVF_TXD_CTX_QW1_CMD_SHIFT;
> }
>
> + if (*RTE_MBUF_DYNFIELD(m,
> + iavf_tx_lldp_dynfield_offset, uint8_t *) > 0)
> + cmd |= IAVF_TX_CTX_DESC_SWTCH_UPLINK
> + << IAVF_TXD_CTX_QW1_CMD_SHIFT;
> +
> *field |= cmd;
> }
>
> @@ -2826,7 +2838,7 @@ iavf_xmit_pkts(void *tx_queue, struct rte_mbuf
> **tx_pkts, uint16_t nb_pkts)
>
> nb_desc_data = mb->nb_segs;
> nb_desc_ctx =
> - iavf_calc_context_desc(mb->ol_flags, txq->vlan_flag);
> + iavf_calc_context_desc(mb, txq->vlan_flag);
> nb_desc_ipsec = !!(mb->ol_flags &
> RTE_MBUF_F_TX_SEC_OFFLOAD);
>
> /**
> diff --git a/drivers/net/iavf/iavf_rxtx.h b/drivers/net/iavf/iavf_rxtx.h index
> f432f9d956..f6954a83c2 100644
> --- a/drivers/net/iavf/iavf_rxtx.h
> +++ b/drivers/net/iavf/iavf_rxtx.h
> @@ -107,8 +107,11 @@
> #define IAVF_MAX_DATA_PER_TXD \
> (IAVF_TXD_QW1_TX_BUF_SZ_MASK >>
> IAVF_TXD_QW1_TX_BUF_SZ_SHIFT)
>
> +#define IAVF_TX_LLDP_DYNFIELD "intel_pmd_dynfield_tx_lldp"
> +
> extern uint64_t iavf_timestamp_dynflag; extern int
> iavf_timestamp_dynfield_offset;
> +extern int iavf_tx_lldp_dynfield_offset;
It may not necessary to expose the offset value, as IAVF_TX_LLDP_DYNFIELD is
the contract between
application and PMD already.
