From 73d2c1d3f33c63410645548809b18de97e563c07 Mon Sep 17 00:00:00 2001 From: Noa Ezra Date: Sun, 13 Jan 2019 11:37:06 +0000 Subject: [PATCH] examples/ip_fragmentation: support big packets In some vendors the RX and TX configuration must be the same, therefore the MTU size need to be equal to max_rx_pkt_len. The MTU is the largest size packet in bytes that can be sent on the network, therefore before changing this parameter, the NIC could not receive packets larger than 1500 bytes, which is the default MTU size. In addition, scatter-gather need to be enabled in order to receive frames bigger than mbuf size. Signed-off-by: Noa Ezra Acked-by: Konstantin Ananyev --- examples/ip_fragmentation/main.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/examples/ip_fragmentation/main.c b/examples/ip_fragmentation/main.c index 17a877da2d..8d789b417e 100644 --- a/examples/ip_fragmentation/main.c +++ b/examples/ip_fragmentation/main.c @@ -141,6 +141,7 @@ static struct rte_eth_conf port_conf = { .max_rx_pkt_len = JUMBO_FRAME_MAX_SIZE, .split_hdr_size = 0, .offloads = (DEV_RX_OFFLOAD_CHECKSUM | + DEV_RX_OFFLOAD_SCATTER | DEV_RX_OFFLOAD_JUMBO_FRAME), }, .txmode = { @@ -935,6 +936,16 @@ main(int argc, char **argv) ret, portid); } + /* set the mtu to the maximum received packet size */ + ret = rte_eth_dev_set_mtu(portid, + local_port_conf.rxmode.max_rx_pkt_len); + if (ret < 0) { + printf("\n"); + rte_exit(EXIT_FAILURE, "Set MTU failed: " + "err=%d, port=%d\n", + ret, portid); + } + ret = rte_eth_dev_adjust_nb_rx_tx_desc(portid, &nb_rxd, &nb_txd); if (ret < 0) { -- 2.20.1