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> Co-authored-by: Tiago Lam <tiago....@intel.com> Signed-off-by: Michael Qiu <qiud...@chinac.com> Signed-off-by: Mark Kavanagh <mark.b.kavan...@intel.com> Signed-off-by: Tiago Lam <tiago....@intel.com> Acked-by: Eelco Chaudron <echau...@redhat.com> --- lib/dp-packet.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++--------- lib/dp-packet.h | 3 +++ lib/netdev-dpdk.c | 1 + 3 files changed, 64 insertions(+), 11 deletions(-) diff --git a/lib/dp-packet.c b/lib/dp-packet.c index d6e19eb..6773535 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 +175,44 @@ 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 *b, size_t headroom) { + struct dp_packet *new_buffer; + uint32_t pkt_len = dp_packet_size(b); + + /* copy multi-seg data */ + if (b->source == DPBUF_DPDK && b->mbuf.nb_segs > 1) { + void *dst = NULL; + struct rte_mbuf *mbuf = CONST_CAST(struct rte_mbuf *, &b->mbuf); + + new_buffer = dp_packet_new_with_headroom(pkt_len, headroom); + dst = dp_packet_data(new_buffer); + dp_packet_set_size(new_buffer, pkt_len); + + if (!rte_pktmbuf_read(mbuf, 0, pkt_len, dst)) { + return NULL; + } + } else { + new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(b), + dp_packet_size(b), + headroom); + } + + /* Copy the following fields into the returned buffer: l2_pad_size, + * l2_5_ofs, l3_ofs, l4_ofs, cutlen, packet_type and md. */ + memcpy(&new_buffer->l2_pad_size, &b->l2_pad_size, + sizeof(struct dp_packet) - + offsetof(struct dp_packet, l2_pad_size)); + + dp_packet_copy_mbuf_flags(new_buffer, b); + if (dp_packet_rss_valid(new_buffer)) { + new_buffer->mbuf.hash.rss = b->mbuf.hash.rss; + } + + return new_buffer; +} +#else /* Creates and returns a new dp_packet whose data are copied from 'buffer'. * The returned dp_packet will additionally have 'headroom' bytes of * headroom. */ @@ -165,32 +220,25 @@ 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); new_buffer = dp_packet_clone_data_with_headroom(dp_packet_data(buffer), - dp_packet_size(buffer), - headroom); + pkt_len, headroom); + /* Copy the following fields into the returned buffer: l2_pad_size, * l2_5_ofs, l3_ofs, l4_ofs, cutlen, packet_type and md. */ memcpy(&new_buffer->l2_pad_size, &buffer->l2_pad_size, sizeof(struct dp_packet) - offsetof(struct dp_packet, l2_pad_size)); -#ifdef DPDK_NETDEV - new_buffer->mbuf.ol_flags = buffer->mbuf.ol_flags; -#else new_buffer->rss_hash_valid = buffer->rss_hash_valid; -#endif - if (dp_packet_rss_valid(new_buffer)) { -#ifdef DPDK_NETDEV - new_buffer->mbuf.hash.rss = buffer->mbuf.hash.rss; -#else new_buffer->rss_hash = buffer->rss_hash; -#endif } return new_buffer; } +#endif /* Creates and returns a new dp_packet that initially contains a copy of the * 'size' bytes of data starting at 'data' with no headroom or tailroom. */ @@ -330,6 +378,7 @@ dp_packet_mbuf_write(struct rte_mbuf *mbuf, int16_t ofs, uint32_t len, len -= len_copy; ofs = 0; + mbuf->data_len = len_copy; mbuf = mbuf->next; } } diff --git a/lib/dp-packet.h b/lib/dp-packet.h index 6ca4e98..d087cb3 100644 --- a/lib/dp-packet.h +++ b/lib/dp-packet.h @@ -124,6 +124,9 @@ void dp_packet_init_dpdk(struct dp_packet *); void dp_packet_init(struct dp_packet *, size_t); void dp_packet_uninit(struct dp_packet *); +void dp_packet_copy_mbuf_flags(struct dp_packet *dst, + const struct dp_packet *src); + struct dp_packet *dp_packet_new(size_t); struct dp_packet *dp_packet_new_with_headroom(size_t, size_t headroom); struct dp_packet *dp_packet_clone(const struct dp_packet *); diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c index bf68850..50de1a2 100644 --- a/lib/netdev-dpdk.c +++ b/lib/netdev-dpdk.c @@ -2368,6 +2368,7 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch) memcpy(rte_pktmbuf_mtod(pkts[txcnt], void *), dp_packet_data(packet), size); dp_packet_set_size((struct dp_packet *)pkts[txcnt], size); + dp_packet_copy_mbuf_flags((struct dp_packet *)pkts[txcnt], packet); txcnt++; } -- 2.7.4 _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev