[dpdk-dev] [PATCH v6 2/2] librte_ethdev: fix MTU size exceeds max rx packet length
SteveX Yang
stevex.yang at intel.com
Thu Oct 22 10:48:51 CEST 2020
If max rx packet length is smaller then MTU + Ether overhead, that will
drop all MTU size packets.
Update the MTU size according to the max rx packet and Ether overhead.
Fixes: 59d0ecdbf0e1 ("ethdev: MTU accessors")
Signed-off-by: SteveX Yang <stevex.yang at intel.com>
---
lib/librte_ethdev/rte_ethdev.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index b12bb3854..17f1c33ac 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -1290,6 +1290,8 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
struct rte_eth_dev *dev;
struct rte_eth_dev_info dev_info;
struct rte_eth_conf orig_conf;
+ uint16_t overhead_len;
+ uint16_t max_rx_pktlen;
int diag;
int ret;
@@ -1415,6 +1417,18 @@ rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
RTE_ETHER_MAX_LEN;
}
+ /*
+ * Update MTU value if MTU + OVERHEAD exceeds the max_rx_pkt_len
+ */
+ max_rx_pktlen = dev->data->dev_conf.rxmode.max_rx_pkt_len;
+ if (dev_info.max_rx_pktlen && dev_info.max_mtu)
+ overhead_len = dev_info.max_rx_pktlen - dev_info.max_mtu;
+ else
+ overhead_len = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+
+ if (max_rx_pktlen < dev->data->mtu + overhead_len)
+ dev->data->mtu = max_rx_pktlen - overhead_len;
+
/*
* If LRO is enabled, check that the maximum aggregated packet
* size is supported by the configured device.
--
2.17.1
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