From: Rohit Raj <[email protected]>
l3fwd uses mbufs with 2KB data size. If we enable jumbo packets, it is
not able to store packets with size greater than 2KB, hence these
packets are dropped.
This patch fixes this issue by enabling scatter for jumbo packet, if
it is supported by NIC.
If scatter is not supported by NIC and max packet length is greater
than default mbuf data size, then application exits with proper error
message.
Fixes: f68aad7904f ("examples/l3fwd: update")
Signed-off-by: Rohit Raj <[email protected]>
Signed-off-by: Sachin Saxena <[email protected]>
Signed-off-by: Vanshika Shukla <[email protected]>
---
v2:
* Improved the check to not enable Rx scatter when packets fits into
buffer.
* Check if jumbo packet is enabled using max_rx_pktlen instead of
jumbo packet flag.
examples/l3fwd/main.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/examples/l3fwd/main.c b/examples/l3fwd/main.c
index d69373f881..61448c759c 100644
--- a/examples/l3fwd/main.c
+++ b/examples/l3fwd/main.c
@@ -1109,6 +1109,19 @@ l3fwd_poll_resource_setup(void)
"Invalid max packet length: %u (port %u)\n",
max_pkt_len, portid);
+ /* Enable Receive side SCATTER, if supported by NIC,
+ * when jumbo packet is enabled.
+ */
+ if (dev_info.max_rx_pktlen > RTE_MBUF_DEFAULT_DATAROOM) {
+ if (dev_info.rx_offload_capa &
+ RTE_ETH_RX_OFFLOAD_SCATTER)
+ local_port_conf.rxmode.offloads |=
+ RTE_ETH_RX_OFFLOAD_SCATTER;
+ else
+ rte_exit(EXIT_FAILURE,
+ "Max packet length greater than
default MBUF size\n");
+ }
+
if (dev_info.tx_offload_capa &
RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE)
local_port_conf.txmode.offloads |=
RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;
--
2.17.1
