ligang/vpp
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Increment MRU if hardware supports CRC stripping

Browse Source 
Change-Id: I46bd007c3c75e5fb872c1beba557e6140fa8d715
Signed-off-by: Todd Foggoa (tfoggoa) <tfoggoa@cisco.com>
This commit is contained in:
Jurek Matuszewski
2016-03-28 15:15:15 -04:00
committed by Gerrit Code Review
parent ad8b4728cb
commit a69318b7f7
1 changed files with 27 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
vnet/vnet/devices/dpdk/init.c
View File

@ -472,9 +472,33 @@ dpdk_lib_init (dpdk_main_t * dm)
* Otherwise rte_eth_dev_configure() will fail and the port will
* not be available.
*/
xd->port_conf.rxmode.max_rx_pkt_len =
(ETHERNET_MAX_PACKET_BYTES > dev_info.max_rx_pktlen) ?
dev_info.max_rx_pktlen : ETHERNET_MAX_PACKET_BYTES;
if (ETHERNET_MAX_PACKET_BYTES > dev_info.max_rx_pktlen)
{
/*
* This device does not support the platforms's max frame
* size. Use it's advertised mru instead.
*/
xd->port_conf.rxmode.max_rx_pkt_len = dev_info.max_rx_pktlen;
}
else
{
xd->port_conf.rxmode.max_rx_pkt_len = ETHERNET_MAX_PACKET_BYTES;
/*
* Some platforms do not account for Ethernet FCS (4 bytes) in
* MTU calculations. To interop with them increase mru but only
* if the device's settings can support it.
*/
if ((dev_info.max_rx_pktlen >= (ETHERNET_MAX_PACKET_BYTES + 4)) &&
xd->port_conf.rxmode.hw_strip_crc)
{
/*
* Allow additional 4 bytes (for Ethernet FCS). These bytes are
* stripped by h/w and so will not consume any buffer memory.
*/
xd->port_conf.rxmode.max_rx_pkt_len += 4;
}
}
/*
* DAW-FIXME: VMXNET3 driver doesn't support jumbo / multi-buffer pkts