Hi Rujan,
Can you please explain what you are trying to do here.
You cannot assume inside VPP code that rte_mbuf is present and even if it is
present, that it is filled by real data.
Locally originated packets and packets coming from non-dpdk sources simply
don't have rte_mbuf initialized.
rte_mbuf header is constructed inside TX code based on data from vlib_buffer_t
so typically it is enough to modify
vlib_buffer_t fields.
Hope this explains,
Damjan
> On 21 Mar 2017, at 06:45, Li, Rujun <rujun...@intel.com> wrote:
>
> Hi all
>
> I have a vlib_buffer_t packets (in GDB) looks like:
>
> $37 = {cacheline0 = 0x7fff54716f00 "\362\377*", current_data = -14,
> current_length = 42, flags = 0, free_list_index = 0,
> total_length_not_including_first_buffer = 0, next_buffer = 0,
> trace_index = 0, clone_count = 0, error = 401409, opaque = {0, 5, 3, 3, 2,
> 0, 0, 0}, cacheline1 = 0x7fff54716f40 "", opaque2 = {
> 0 <repeats 16 times>}, cacheline2 = 0x7fff54716f80 "",
> pre_data = '\000' <repeats 114 times>,
> "\377\377\377\377\377\377\000\036g\246{\356\b\006", data = 0x7fff54717000 ""}
> it is an arp-boardcast packet
>
> and I want to change it into rte_mbuf *, so I called
> rte_mbuf_from_vlib_buffer(b)
>
> but the changed rte_mbuf (in GDB) looks like:
>
> $38 = {cacheline0 = 0x7fff54716e80, buf_addr = 0x0, buf_physaddr = 0,
> buf_len = 0, rearm_data = 0x7fff54716e92 "", data_off = 0, {refcnt_atomic =
> {
> cnt = 0}, refcnt = 0}, nb_segs = 0 '\000', port = 0 '\000',
> ol_flags = 0, rx_descriptor_fields1 = 0x7fff54716ea0, {packet_type = 0, {
> l2_type = 0, l3_type = 0, l4_type = 0, tun_type = 0, inner_l2_type = 0,
> inner_l3_type = 0, inner_l4_type = 0}}, pkt_len = 0, data_len = 0,
> vlan_tci = 0, hash = {rss = 0, fdir = {{{hash = 0, id = 0}, lo = 0},
> hi = 0}, sched = {lo = 0, hi = 0}, usr = 0}, seqn = 0,
> vlan_tci_outer = 0, cacheline1 = 0x7fff54716ec0, {userdata = 0x0,
> udata64 = 0}, pool = 0x0, next = 0x0, {tx_offload = 0, {l2_len = 0,
> l3_len = 0, l4_len = 0, tso_segsz = 0, outer_l3_len = 0,
> outer_l2_len = 0}}, priv_size = 0, timesync = 0}
>
> my code is :
> struct rte_mbuf * mb;
> mb = (((struct rte_mbuf *)b) - 1);
> //mb = rte_mbuf_from_vlib_buffer(b); I have also tried this way
> rte_pktmbuf_data_len(mb) = b->current_length;
> mb->pkt_len = b->current_data;
> mb->data_off = 128 + b->current_data;
>
> the result may not correct, do you know why?
>
>
>
> Best wishes,
> Rujun, Li
>
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