[dpdk-dev] [PATCH v4 2/2] app/testpmd: fix max-pkt-len option invalid

[Steve Yang]

Moved the setting of 'DEV_RX_OFFLOAD_JUMBO_FRAME' from
'cmd_config_max_pkt_len_parsed()' to 'init_config()' caused fail the case
where 'max_rx_pkt_len' is changed from the command line via
"port config all max-pkt-len".

The 'init_config()' function is only called when testpmd is started,
but the DEV_RX_OFFLOAD_JUMBO_FRAME setting needs to be recomputed whenever
'max_rx_pkt_len' changes.

Define the 'update_jumbo_frame_offload()' function for both 'init_config()'
and 'cmd_config_max_pkt_len_parsed()', and detect if 'max_rx_pkt_len'
should be update to 1500 + overhead as default configuration. At the same
time, the offloads of rx queue also should update the value once port
offloads changed (e.g.: disabled JUMBO_FRAME offload via changed
max-pkt-len, reproduce steps [1]), otherwise, it would cause unexpected
result.

[1]
--------------------------------------------------------------------------
./x86_64-native-linuxapp-gcc/app/dpdk-testpmd  -c 0xf -n 4  -- -i
    --max-pkt-len=9000 --tx-offloads=0x8000 --rxq=4 --txq=4 --disable-rss
testpmd>  set verbose 3
testpmd>  port stop all
testpmd>  port config all max-pkt-len 1518  port start all

// Got fail error info without this patch
Configuring Port 0 (socket 1)
Ethdev port_id=0 rx_queue_id=0, new added offloads 0x800 must be
within per-queue offload capabilities 0x0 in rte_eth_rx_queue_setup()
Fail to configure port 0 rx queues //<-- Fail error info;
--------------------------------------------------------------------------

Fixes: 761c4d6690 ("app/testpmd: fix max Rx packet length for VLAN packets")

Signed-off-by: Steve Yang <stevex.yang at intel.com>
---
 app/test-pmd/cmdline.c    |  1 +
 app/test-pmd/parameters.c |  1 +
 app/test-pmd/testpmd.c    | 63 ++++++++++++++++++++++++++++-----------
 app/test-pmd/testpmd.h    |  2 ++
 4 files changed, 50 insertions(+), 17 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 89034c8b72..8b6b7b6206 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -1901,6 +1901,7 @@ cmd_config_max_pkt_len_parsed(void *parsed_result,
 			printf("Unknown parameter\n");
 			return;
 		}
+		update_jumbo_frame_offload(pid, false);
 	}
 
 	init_port_config();
diff --git a/app/test-pmd/parameters.c b/app/test-pmd/parameters.c
index df5eb10d84..1c63156ddd 100644
--- a/app/test-pmd/parameters.c
+++ b/app/test-pmd/parameters.c
@@ -833,6 +833,7 @@ launch_args_parse(int argc, char** argv)
 						 "total-num-mbufs should be > 1024\n");
 			}
 			if (!strcmp(lgopts[opt_idx].name, "max-pkt-len")) {
+				default_max_pktlen = false;
 				n = atoi(optarg);
 				if (n >= RTE_ETHER_MIN_LEN)
 					rx_mode.max_rx_pkt_len = (uint32_t) n;
diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index c256e719ae..f22d2be46d 100644
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -531,6 +531,8 @@ uint16_t gso_max_segment_size = RTE_ETHER_MAX_LEN - RTE_ETHER_CRC_LEN;
 /* Holds the registered mbuf dynamic flags names. */
 char dynf_names[64][RTE_MBUF_DYN_NAMESIZE];
 
+bool default_max_pktlen = true;
+
 /*
  * Helper function to check if socket is already discovered.
  * If yes, return positive value. If not, return zero.
@@ -1410,7 +1412,6 @@ init_config(void)
 	struct rte_gro_param gro_param;
 	uint32_t gso_types;
 	uint16_t data_size;
-	uint16_t eth_overhead;
 	bool warning = 0;
 	int k;
 	int ret;
@@ -1447,22 +1448,7 @@ init_config(void)
 			rte_exit(EXIT_FAILURE,
 				 "rte_eth_dev_info_get() failed\n");
 
-		/* Update the max_rx_pkt_len to have MTU as RTE_ETHER_MTU */
-		if (port->dev_info.max_mtu != UINT16_MAX &&
-		    port->dev_info.max_rx_pktlen > port->dev_info.max_mtu)
-			eth_overhead = port->dev_info.max_rx_pktlen -
-				port->dev_info.max_mtu;
-		else
-			eth_overhead =
-				RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
-
-		if (port->dev_conf.rxmode.max_rx_pkt_len <=
-			(uint32_t)(RTE_ETHER_MTU + eth_overhead))
-			port->dev_conf.rxmode.max_rx_pkt_len =
-					RTE_ETHER_MTU + eth_overhead;
-		else
-			port->dev_conf.rxmode.offloads |=
-					DEV_RX_OFFLOAD_JUMBO_FRAME;
+		update_jumbo_frame_offload(pid, default_max_pktlen);
 
 		if (!(port->dev_info.tx_offload_capa &
 		      DEV_TX_OFFLOAD_MBUF_FAST_FREE))
@@ -3358,6 +3344,49 @@ rxtx_port_config(struct rte_port *port)
 	}
 }
 
+void
+update_jumbo_frame_offload(portid_t portid, bool def_max_pktlen)
+{
+	struct rte_port *port = &ports[portid];
+	uint32_t eth_overhead;
+	uint64_t rx_offloads;
+
+	/* Update the max_rx_pkt_len to have MTU as RTE_ETHER_MTU */
+	if (port->dev_info.max_mtu != UINT16_MAX &&
+	    port->dev_info.max_rx_pktlen > port->dev_info.max_mtu)
+		eth_overhead = port->dev_info.max_rx_pktlen -
+				port->dev_info.max_mtu;
+	else
+		eth_overhead = RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN;
+
+	rx_offloads = port->dev_conf.rxmode.offloads;
+	if (port->dev_conf.rxmode.max_rx_pkt_len <=
+		RTE_ETHER_MTU + eth_overhead) {
+		/*
+		 * If command line option doesn't include --max-pkt-len,
+		 * the default max_rx_pkt_len should be set to 1500 + overhead.
+		 */
+		if (def_max_pktlen)
+			port->dev_conf.rxmode.max_rx_pkt_len =
+						RTE_ETHER_MTU + eth_overhead;
+		rx_offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
+	} else
+		rx_offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+
+	/* Apply Rx offloads configuration to Rx queue(s) */
+	if (rx_offloads != port->dev_conf.rxmode.offloads) {
+		uint16_t qid;
+
+		port->dev_conf.rxmode.offloads = rx_offloads;
+		if (eth_dev_info_get_print_err(portid, &port->dev_info) != 0)
+			rte_exit(EXIT_FAILURE,
+				"rte_eth_dev_info_get() failed\n");
+
+		for (qid = 0; qid < port->dev_info.nb_rx_queues; qid++)
+			port->rx_conf[qid].offloads = rx_offloads;
+	}
+}
+
 void
 init_port_config(void)
 {
diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 5f23162107..16f6fbefef 100644
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -304,6 +304,7 @@ extern cmdline_parse_inst_t cmd_show_set_raw_all;
 
 extern uint16_t mempool_flags;
 
+extern bool default_max_pktlen;
 /**
  * Forwarding Configuration
  *
@@ -1005,6 +1006,7 @@ uint16_t tx_pkt_set_dynf(uint16_t port_id, __rte_unused uint16_t queue,
 			 __rte_unused void *user_param);
 void add_tx_dynf_callback(portid_t portid);
 void remove_tx_dynf_callback(portid_t portid);
+void update_jumbo_frame_offload(portid_t portid, bool def_max_pktlen);
 
 /*
  * Work-around of a compilation error with ICC on invocations of the
-- 
2.17.1