From: Michael Qiu <qiud...@chinac.com> Currently, one packet is only copied to one segment in function dpdk_do_tx_copy(), this could be an issue when a jumbo frame comes, especially for multiple segments.
This patch calculate the segment number needed by the packet and copy the data to different segments. Signed-off-by: Michael Qiu <qiud...@chinac.com> --- lib/netdev-dpdk.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 48 insertions(+), 5 deletions(-) diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c index ba044a3..3081854 100644 --- a/lib/netdev-dpdk.c +++ b/lib/netdev-dpdk.c @@ -1736,14 +1736,16 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch) #endif struct netdev_dpdk *dev = netdev_dpdk_cast(netdev); struct rte_mbuf *pkts[PKT_ARRAY_SIZE]; + struct rte_mbuf *temp, *head = NULL; int dropped = 0; int newcnt = 0; - int i; + int i, j, nb_segs; dp_packet_batch_apply_cutlen(batch); for (i = 0; i < batch->count; i++) { int size = dp_packet_size(batch->packets[i]); + int max_data_len, tmp_len; if (OVS_UNLIKELY(size > dev->max_packet_len)) { VLOG_WARN_RL(&rl, "Too big size %d max_packet_len %d", @@ -1753,7 +1755,24 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch) continue; } - pkts[newcnt] = rte_pktmbuf_alloc(dev->dpdk_mp->mp); + temp = pkts[newcnt] = rte_pktmbuf_alloc(dev->dpdk_mp->mp); + + /* all new allocated mbuf's max data len is the same */ + max_data_len = temp->buf_len - temp->data_off; + + nb_segs = size/max_data_len; + if (size % max_data_len) + nb_segs = nb_segs + 1; + + for (j = 1; j < nb_segs; j++) { + temp->next = rte_pktmbuf_alloc(dev->dpdk_mp->mp); + if (!temp->next) { + rte_pktmbuf_free(pkts[newcnt]); + pkts[newcnt] = NULL; + break; + } + temp = temp->next; + } if (!pkts[newcnt]) { dropped += batch->count - i; @@ -1761,10 +1780,34 @@ dpdk_do_tx_copy(struct netdev *netdev, int qid, struct dp_packet_batch *batch) } /* We have to do a copy for now */ - memcpy(rte_pktmbuf_mtod(pkts[newcnt], void *), - dp_packet_data(batch->packets[i]), size); + rte_pktmbuf_pkt_len(pkts[newcnt]) = size; + temp = pkts[newcnt]; + tmp_len = size < max_data_len ? size: max_data_len; + if (batch->packets[i]->source == DPBUF_DPDK) { + head = &(batch->packets[i]->mbuf); + while (temp && head && size > 0) { + rte_memcpy(rte_pktmbuf_mtod(temp, void*), dp_packet_data((struct dp_packet *)head),tmp_len); + rte_pktmbuf_data_len(temp) = tmp_len; + head = head->next; + size = size - tmp_len; + tmp_len = size < max_data_len ? size: max_data_len; + temp = temp->next; + } + } else { + int offset = 0; + while (temp && size > 0) { + memcpy(rte_pktmbuf_mtod(temp, void *), + dp_packet_at(batch->packets[i], offset,tmp_len), tmp_len); + rte_pktmbuf_data_len(temp) = tmp_len; + temp = temp->next; + size = size - tmp_len; + offset +=tmp_len; + tmp_len = size < max_data_len ? size: max_data_len; + } + } + - pkts[newcnt]->nb_segs = batch->packets[i]->mbuf.nb_segs; + pkts[newcnt]->nb_segs = nb_segs; pkts[newcnt]->ol_flags = batch->packets[i]->mbuf.ol_flags; pkts[newcnt]->packet_type = batch->packets[i]->mbuf.packet_type; pkts[newcnt]->tx_offload = batch->packets[i]->mbuf.tx_offload; -- 1.8.3.1 _______________________________________________ dev mailing list d...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-dev