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-rw-r--r--src/plugins/dpdk/device/common.c19
-rw-r--r--src/plugins/dpdk/device/init.c3
2 files changed, 11 insertions, 11 deletions
diff --git a/src/plugins/dpdk/device/common.c b/src/plugins/dpdk/device/common.c
index df80a85872d..61ab7b4a5b2 100644
--- a/src/plugins/dpdk/device/common.c
+++ b/src/plugins/dpdk/device/common.c
@@ -66,7 +66,7 @@ dpdk_device_setup (dpdk_device_t * xd)
struct rte_eth_dev_info dev_info;
struct rte_eth_conf conf = {};
u64 rxo, txo;
- u16 mtu;
+ u16 max_frame_size;
int rv;
int j;
@@ -179,12 +179,11 @@ dpdk_device_setup (dpdk_device_t * xd)
xd->max_supported_frame_size = dev_info.max_rx_pktlen;
#endif
- mtu = clib_min (xd->max_supported_frame_size - xd->driver_frame_overhead,
- ethernet_main.default_mtu);
- mtu = mtu + hi->frame_overhead - xd->driver_frame_overhead;
+ max_frame_size = clib_min (xd->max_supported_frame_size,
+ ethernet_main.default_mtu + hi->frame_overhead);
#if RTE_VERSION >= RTE_VERSION_NUM(21, 11, 0, 0)
- conf.rxmode.mtu = mtu;
+ conf.rxmode.mtu = max_frame_size - xd->driver_frame_overhead;
#endif
retry:
@@ -197,15 +196,15 @@ retry:
}
#if RTE_VERSION < RTE_VERSION_NUM(21, 11, 0, 0)
- rte_eth_dev_set_mtu (xd->port_id, mtu);
+ rte_eth_dev_set_mtu (xd->port_id,
+ max_frame_size - xd->driver_frame_overhead);
#endif
hi->max_frame_size = 0;
- vnet_hw_interface_set_max_frame_size (vnm, xd->hw_if_index,
- mtu + hi->frame_overhead);
- dpdk_log_debug ("[%u] mtu %u max_frame_size %u max max_frame_size %u "
+ vnet_hw_interface_set_max_frame_size (vnm, xd->hw_if_index, max_frame_size);
+ dpdk_log_debug ("[%u] max_frame_size %u max max_frame_size %u "
"driver_frame_overhead %u",
- xd->port_id, mtu, hi->max_frame_size,
+ xd->port_id, hi->max_frame_size,
xd->max_supported_frame_size, xd->driver_frame_overhead);
vec_validate_aligned (xd->tx_queues, xd->conf.n_tx_queues - 1,
diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 9d68775d86a..3b5b90704df 100644
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -399,7 +399,8 @@ dpdk_lib_init (dpdk_main_t * dm)
#if RTE_VERSION >= RTE_VERSION_NUM(21, 11, 0, 0)
q = di.max_rx_pktlen - di.max_mtu;
- if (q < xd->driver_frame_overhead && q > 0)
+ /* attempt to protect from bogus value provided by pmd */
+ if (q < (2 * xd->driver_frame_overhead) && q > 0)
xd->driver_frame_overhead = q;
dpdk_log_debug ("[%u] min_mtu: %u, max_mtu: %u, min_rx_bufsize: %u, "
"max_rx_pktlen: %u, max_lro_pkt_size: %u",