Hi,
On 10/22/2015 5:44 PM, Chen Jing D(Mark) wrote:
> From: "Chen Jing D(Mark)" <jing.d.chen at intel.com>
>
> Add func fm10k_recv_raw_pkts_vec to parse raw packets, in which
> includes possible chained packets.
> Add func fm10k_recv_pkts_vec to receive single mbuf packet.
>
> Signed-off-by: Chen Jing D(Mark) <jing.d.chen at intel.com>
> ---
> drivers/net/fm10k/fm10k.h | 1 +
> drivers/net/fm10k/fm10k_rxtx_vec.c | 196
> ++++++++++++++++++++++++++++++++++++
> 2 files changed, 197 insertions(+), 0 deletions(-)
[...]
> + /* mask to shuffle from desc. to mbuf */
> + shuf_msk = _mm_set_epi8(
> + 7, 6, 5, 4, /* octet 4~7, 32bits rss */
> + 15, 14, /* octet 14~15, low 16 bits vlan_macip */
> + 13, 12, /* octet 12~13, 16 bits data_len */
> + 0xFF, 0xFF, /* skip high 16 bits pkt_len, zero out */
> + 13, 12, /* octet 12~13, low 16 bits pkt_len */
> + 0xFF, 0xFF, /* skip high 16 bits pkt_type */
> + 0xFF, 0xFF /* Skip pkt_type field in shuffle operation */
> + );
> +
> + /* Cache is empty -> need to scan the buffer rings, but first move
> + * the next 'n' mbufs into the cache
> + */
> + mbufp = &rxq->sw_ring[next_dd];
> +
> + /* A. load 4 packet in one loop
> + * [A*. mask out 4 unused dirty field in desc]
> + * B. copy 4 mbuf point from swring to rx_pkts
> + * C. calc the number of DD bits among the 4 packets
> + * [C*. extract the end-of-packet bit, if requested]
> + * D. fill info. from desc to mbuf
> + */
> + for (pos = 0, nb_pkts_recd = 0; pos < nb_pkts;
It's necessary to floor align the nb_pkts into RTE_FM10K_DESCS_PER_LOOP,
otherwise it may exceed the rx_pkts array.
e.g. nb_pkts is 6, it executes twice in the loop which has chance to get
8 packets done, but rx_pkts only expect 6 packets.
>
> + pos += RTE_FM10K_DESCS_PER_LOOP,
> + rxdp += RTE_FM10K_DESCS_PER_LOOP) {
> + __m128i descs0[RTE_FM10K_DESCS_PER_LOOP];
> + __m128i pkt_mb1, pkt_mb2, pkt_mb3, pkt_mb4;
> + __m128i zero, staterr, sterr_tmp1, sterr_tmp2;
> + __m128i mbp1, mbp2; /* two mbuf pointer in one XMM reg. */
> +
>
