app/testpmd: fix setting maximum packet length

"port config all max-pkt-len" command fails because it doesn't set the
'DEV_RX_OFFLOAD_JUMBO_FRAME' offload flag properly.

Commit in the fixes line moved the 'DEV_RX_OFFLOAD_JUMBO_FRAME' offload
flag update from 'cmd_config_max_pkt_len_parsed()' to 'init_config()'.
'init_config()' function is only called during testpmd startup, but the
flag status needs to be calculated whenever 'max_rx_pkt_len' changes.

The issue can be reproduced as [1], where the 'max-pkt-len' reduced and
'DEV_RX_OFFLOAD_JUMBO_FRAME' offload flag should be cleared but it
didn't.

Adding the 'update_jumbo_frame_offload()' helper function to update
'DEV_RX_OFFLOAD_JUMBO_FRAME' offload flag and 'max_rx_pkt_len'. This
function is called both by 'init_config()' and
'cmd_config_max_pkt_len_parsed()'.

Default 'max-pkt-len' value set to zero, 'update_jumbo_frame_offload()'
updates it to "RTE_ETHER_MTU + PMD specific Ethernet overhead" when it
is zero.
If '--max-pkt-len=N' argument provided, it will be used instead.
And with each "port config all max-pkt-len" command, the
'DEV_RX_OFFLOAD_JUMBO_FRAME' offload flag, 'max-pkt-len' and MTU is
updated.

[1]
--------------------------------------------------------------------------
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
testpmd>  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;
--------------------------------------------------------------------------

Bugzilla ID: 625
Fixes: 761c4d66900f ("app/testpmd: fix max Rx packet length for VLAN packets")
Cc: stable@dpdk.org
Signed-off-by: Steve Yang <stevex.yang@intel.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Lance Richardson <lance.richardson@broadcom.com>
Acked-by: Wisam Jaddo <wisamm@nvidia.com>
Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>
Tested-by: Bo Chen <box.c.chen@intel.com>

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index c6ace2d..b338f5f 100644 (file)
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -1877,7 +1877,9 @@ cmd_config_max_pkt_len_parsed(void *parsed_result,
                                __rte_unused void *data)
 {
        struct cmd_config_max_pkt_len_result *res = parsed_result;
+       uint32_t max_rx_pkt_len_backup = 0;
        portid_t pid;
+       int ret;
 
        if (!all_ports_stopped()) {
                printf("Please stop all ports first\n");
@@ -1896,7 +1898,18 @@ cmd_config_max_pkt_len_parsed(void *parsed_result,
                        if (res->value == port->dev_conf.rxmode.max_rx_pkt_len)
                                return;
 
+                       ret = eth_dev_info_get_print_err(pid, &port->dev_info);
+                       if (ret != 0) {
+                               printf("rte_eth_dev_info_get() failed for port %u\n",
+                                       pid);
+                               return;
+                       }
+
+                       max_rx_pkt_len_backup = port->dev_conf.rxmode.max_rx_pkt_len;
+
                        port->dev_conf.rxmode.max_rx_pkt_len = res->value;
+                       if (update_jumbo_frame_offload(pid) != 0)
+                               port->dev_conf.rxmode.max_rx_pkt_len = max_rx_pkt_len_backup;
                } else {
                        printf("Unknown parameter\n");
                        return;

diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c
index c256e71..555852a 100644 (file)
--- a/app/test-pmd/testpmd.c
+++ b/app/test-pmd/testpmd.c
@@ -443,8 +443,11 @@ lcoreid_t latencystats_lcore_id = -1;
  * Ethernet device configuration.
  */
 struct rte_eth_rxmode rx_mode = {
-       .max_rx_pkt_len = RTE_ETHER_MAX_LEN,
-               /**< Default maximum frame length. */
+       /* Default maximum frame length.
+        * Zero is converted to "RTE_ETHER_MTU + PMD Ethernet overhead"
+        * in init_config().
+        */
+       .max_rx_pkt_len = 0,
 };
 
 struct rte_eth_txmode tx_mode = {
@@ -1410,7 +1413,6 @@ 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 +1449,10 @@ 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;
+               ret = update_jumbo_frame_offload(pid);
+               if (ret != 0)
+                       printf("Updating jumbo frame offload failed for port %u\n",
+                               pid);
 
                if (!(port->dev_info.tx_offload_capa &
                      DEV_TX_OFFLOAD_MBUF_FAST_FREE))
@@ -3358,6 +3348,80 @@ rxtx_port_config(struct rte_port *port)
        }
 }
 
+/*
+ * Helper function to arrange max_rx_pktlen value and JUMBO_FRAME offload,
+ * MTU is also aligned if JUMBO_FRAME offload is not set.
+ *
+ * port->dev_info should be set before calling this function.
+ *
+ * return 0 on success, negative on error
+ */
+int
+update_jumbo_frame_offload(portid_t portid)
+{
+       struct rte_port *port = &ports[portid];
+       uint32_t eth_overhead;
+       uint64_t rx_offloads;
+       int ret;
+       bool on;
+
+       /* 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;
+
+       /* Default config value is 0 to use PMD specific overhead */
+       if (port->dev_conf.rxmode.max_rx_pkt_len == 0)
+               port->dev_conf.rxmode.max_rx_pkt_len = RTE_ETHER_MTU + eth_overhead;
+
+       if (port->dev_conf.rxmode.max_rx_pkt_len <= RTE_ETHER_MTU + eth_overhead) {
+               rx_offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
+               on = false;
+       } else {
+               if ((port->dev_info.rx_offload_capa & DEV_RX_OFFLOAD_JUMBO_FRAME) == 0) {
+                       printf("Frame size (%u) is not supported by port %u\n",
+                               port->dev_conf.rxmode.max_rx_pkt_len,
+                               portid);
+                       return -1;
+               }
+               rx_offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+               on = true;
+       }
+
+       if (rx_offloads != port->dev_conf.rxmode.offloads) {
+               uint16_t qid;
+
+               port->dev_conf.rxmode.offloads = rx_offloads;
+
+               /* Apply JUMBO_FRAME offload configuration to Rx queue(s) */
+               for (qid = 0; qid < port->dev_info.nb_rx_queues; qid++) {
+                       if (on)
+                               port->rx_conf[qid].offloads |= DEV_RX_OFFLOAD_JUMBO_FRAME;
+                       else
+                               port->rx_conf[qid].offloads &= ~DEV_RX_OFFLOAD_JUMBO_FRAME;
+               }
+       }
+
+       /* If JUMBO_FRAME is set MTU conversion done by ethdev layer,
+        * if unset do it here
+        */
+       if ((rx_offloads & DEV_RX_OFFLOAD_JUMBO_FRAME) == 0) {
+               ret = rte_eth_dev_set_mtu(portid,
+                               port->dev_conf.rxmode.max_rx_pkt_len - eth_overhead);
+               if (ret)
+                       printf("Failed to set MTU to %u for port %u\n",
+                               port->dev_conf.rxmode.max_rx_pkt_len - eth_overhead,
+                               portid);
+       }
+
+       return 0;
+}
+
 void
 init_port_config(void)
 {

diff --git a/app/test-pmd/testpmd.h b/app/test-pmd/testpmd.h
index 5f23162..2f8f5a9 100644 (file)
--- a/app/test-pmd/testpmd.h
+++ b/app/test-pmd/testpmd.h
@@ -1005,6 +1005,7 @@ 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);
+int update_jumbo_frame_offload(portid_t portid);
 
 /*
  * Work-around of a compilation error with ICC on invocations of the