On 18/06/2018 14:10, Eelco Chaudron wrote: > > > On 11 Jun 2018, at 18:21, Tiago Lam wrote: > >> From: Michael Qiu <qiud...@chinac.com> >> >> When doing packet clone, if packet source is from DPDK driver, >> multi-segment must be considered, and copy the segment's data one by >> one. >> >> Also, lots of DPDK mbuf's info is missed during a copy, like packet >> type, ol_flags, etc. That information is very important for DPDK to >> do >> packets processing. >> >> Co-authored-by: Mark Kavanagh <mark.b.kavan...@intel.com> >> >> Signed-off-by: Michael Qiu <qiud...@chinac.com> >> Signed-off-by: Mark Kavanagh <mark.b.kavan...@intel.com> >> --- >> lib/dp-packet.c | 76 >> +++++++++++++++++++++++++++++++++++++++++++++++-------- >> lib/dp-packet.h | 3 +++ >> lib/netdev-dpdk.c | 1 + >> 3 files changed, 69 insertions(+), 11 deletions(-) >> >> diff --git a/lib/dp-packet.c b/lib/dp-packet.c >> index d0fab94..2e65b82 100644 >> --- a/lib/dp-packet.c >> +++ b/lib/dp-packet.c >> @@ -48,6 +48,23 @@ dp_packet_use__(struct dp_packet *b, void *base, >> size_t allocated, >> dp_packet_set_size(b, 0); >> } >> >> +#ifdef DPDK_NETDEV >> +void >> +dp_packet_copy_mbuf_flags(struct dp_packet *dst, const struct >> dp_packet *src) >> +{ >> + ovs_assert(dst != NULL && src != NULL); >> + struct rte_mbuf *buf_dst = &(dst->mbuf); >> + struct rte_mbuf buf_src = src->mbuf; >> + >> + buf_dst->nb_segs = buf_src.nb_segs; >> + buf_dst->ol_flags = buf_src.ol_flags; >> + buf_dst->packet_type = buf_src.packet_type; >> + buf_dst->tx_offload = buf_src.tx_offload; >> +} >> +#else >> +#define dp_packet_copy_mbuf_flags(arg1, arg2) >> +#endif >> + >> /* Initializes 'b' as an empty dp_packet that contains the >> 'allocated' bytes of >> * memory starting at 'base'. 'base' should be the first byte of a >> region >> * obtained from malloc(). It will be freed (with free()) if 'b' is >> resized or >> @@ -158,6 +175,50 @@ dp_packet_clone(const struct dp_packet *buffer) >> return dp_packet_clone_with_headroom(buffer, 0); >> } >> >> +#ifdef DPDK_NETDEV >> +struct dp_packet * >> +dp_packet_clone_with_headroom(const struct dp_packet *buffer, >> + size_t headroom) { >> + struct dp_packet *new_buffer; >> + uint32_t pkt_len = dp_packet_size(buffer); >> + >> + /* copy multi-seg data */ >> + if (buffer->source == DPBUF_DPDK && buffer->mbuf.nb_segs > 1) { >> + uint32_t offset = 0; >> + void *dst = NULL; >> + struct rte_mbuf *tmbuf = CONST_CAST(struct rte_mbuf *, >> + &(buffer->mbuf)); >> + >> + new_buffer = dp_packet_new_with_headroom(pkt_len, headroom); >> + dp_packet_set_size(new_buffer, pkt_len + headroom); >> + dst = dp_packet_tail(new_buffer); >> + > > The dst is not pointing to the first data, but to the end of the data, > as dp_packet_set_size() has been called. Why not just call dst = > dp_packet_put_uninit().
I'm taking your suggestion below, so this will be removed. > >> + while (tmbuf) { >> + rte_memcpy((char *)dst + offset, >> + rte_pktmbuf_mtod(tmbuf, void *), >> tmbuf->data_len); >> + offset += tmbuf->data_len; >> + tmbuf = tmbuf->next; > > Why not using rte_pktmbuf_read() here with a check its not a contiguous > read? > Good point! We can use `rte_pktmbuf_read()` to read the data to `new_buffer`. It should be OK since in this clause we have always more than 1 mbuf in the chain. Tiago. _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev