[dpdk-dev] [PATCH v2] app/testpmd: fix error detection in MTU command

Shy Shyman shys at mellanox.com
Mon Jun 8 16:17:47 CEST 2020


MTU is used in testpmd to set the maximum payload size for packets.
According to testpmd, the setting influnce RX only.
In rte_ethdev there's no relation between MTU setting and JUMBO offload or
rx_max_pkt_len.

The previous fix in patch referenced below was meant to update the
correlated variables of max_pkt_len and JUMBO offload, but by doing
so it assumes that MTU setting can only exist when JUMBO offload
supported in the device. For example fail-safe device does supports set MTU
and doesn't support JUMBO offload, and in this case, though set MTU
succeeds, an error message is still printed since the JUMBO packet
offload is disabled.

The fix separates the two conditions to make sure the error
triggers only in case the set_mtu action actually failed.

Fixes: 150c9ac2df13 ("app/testpmd: update Rx offload after setting MTU")
Cc: xavier.huwei at huawei.com

Signed-off-by: Shy Shyman <shys at mellanox.com>
---
v2 - removed warning message.
---
 app/test-pmd/config.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 5381207cc..3b54fb6a0 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1277,8 +1277,9 @@ port_mtu_set(portid_t port_id, uint16_t mtu)
 		return;
 	}
 	diag = rte_eth_dev_set_mtu(port_id, mtu);
-	if (diag == 0 &&
-	    dev_info.rx_offload_capa & DEV_RX_OFFLOAD_JUMBO_FRAME) {
+	if (diag)
+		printf("Set MTU failed. diag=%d\n", diag);
+	else if (dev_info.rx_offload_capa & DEV_RX_OFFLOAD_JUMBO_FRAME) {
 		/*
 		 * Ether overhead in driver is equal to the difference of
 		 * max_rx_pktlen and max_mtu in rte_eth_dev_info when the
@@ -1293,10 +1294,7 @@ port_mtu_set(portid_t port_id, uint16_t mtu)
 		} else
 			rte_port->dev_conf.rxmode.offloads &=
 						~DEV_RX_OFFLOAD_JUMBO_FRAME;
-
-		return;
 	}
-	printf("Set MTU failed. diag=%d\n", diag);
 }
 
 /* Generic flow management functions. */
-- 
2.21.0



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