Add support for reception of jumbo frames

Jumbo frames are now supported through the addition of a "mtu"
parameter of the port in the config file.
Setting the mtu to a value higher than 1500 bytes will enable
the reception of jumbo frames.
In addition, the rte_eth_dev_set_mtu is now set for all pmds.
Finally, setting mbuf_size does not set MEMPOOL_F_NO_SPREAD
anymore. This option was only used for pure debugging.

Big packets can be received using two ways
- Using multiple "small" mbufs, i.e. around 2K. This is the default.
- Using one big mbuf holding the whole packet. This can be enabled
  by setting a parameter mbuf_size in the receiving core configuration

Change-Id: Idd60ad31f41c89f9522dff4d894af2696b7a2ea1
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/VNFs/DPPD-PROX/prox_args.c b/VNFs/DPPD-PROX/prox_args.c
index 08f27e9e..53223cad 100644
--- a/VNFs/DPPD-PROX/prox_args.c
+++ b/VNFs/DPPD-PROX/prox_args.c
@@ -546,6 +546,20 @@ static int get_port_cfg(unsigned sindex, char *str, void *data)
 		}
 		cfg->port_conf.rxmode.hw_strip_crc = val;
 	}
+	else if (STR_EQ(str, "mtu size")) {
+		uint32_t val;
+		if (parse_int(&val, pkey)) {
+			return -1;
+		}
+		if (val) {
+			cfg->mtu = val;
+			if (cfg->mtu + ETHER_HDR_LEN + ETHER_CRC_LEN > ETHER_MAX_LEN) {
+				cfg->port_conf.rxmode.max_rx_pkt_len = cfg->mtu + ETHER_HDR_LEN + ETHER_CRC_LEN + 2 * PROX_VLAN_TAG_SIZE;
+				cfg->port_conf.rxmode.jumbo_frame = 1;
+			}
+		}
+	}
+
 	else if (STR_EQ(str, "rss")) {
 		uint32_t val;
 		if (parse_bool(&val, pkey)) {