Fix init of ENIC driver to allow receiving of jumbo packets

Set rxmode.enable_scatter field in DPDK port config parameter so ENIC
driver will use multiple mbuf's for receiving jumbo packets.
Also remove ENIC driver check to disable setting ENIC MTU as this
capability is now working with the new ENIC driver, subject to 9002B
limit.

Change-Id: I563976201c4968d4538c0759505cef2de876934a
Signed-off-by: John Lo <loj@cisco.com>
(cherry picked from commit 250b95b71babdfb558554c788a82cf45ccc34ab8)

1 files changed, 27 insertions, 49 deletions

diff --git a/src/plugins/dpdk/device/init.c b/src/plugins/dpdk/device/init.c
index 9dc3fcce900..139332fa038 100755
--- a/src/plugins/dpdk/device/init.c
+++ b/src/plugins/dpdk/device/init.c
@@ -419,56 +419,35 @@ dpdk_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags)
     }
   else if (ETHERNET_INTERFACE_FLAG_CONFIG_MTU (flags))
     {
-      /*
-       * DAW-FIXME: The Cisco VIC firmware does not provide an api for a
-       *            driver to dynamically change the mtu.  If/when the
-       *            VIC firmware gets fixed, then this should be removed.
-       */
-      if (xd->pmd == VNET_DPDK_PMD_ENIC)
-	{
-	  struct rte_eth_dev_info dev_info;
+      int rv;
 
-	  /*
-	   * Restore mtu to what has been set by CIMC in the firmware cfg.
-	   */
-	  rte_eth_dev_info_get (xd->device_index, &dev_info);
-	  hi->max_packet_bytes = dev_info.max_rx_pktlen;
+      xd->port_conf.rxmode.max_rx_pkt_len = hi->max_packet_bytes;
 
-	  vlib_cli_output (vlib_get_main (),
-			   "Cisco VIC mtu can only be changed "
-			   "using CIMC then rebooting the server!");
-	}
-      else
-	{
-	  int rv;
+      if (xd->flags & DPDK_DEVICE_FLAG_ADMIN_UP)
+	rte_eth_dev_stop (xd->device_index);
 
-	  xd->port_conf.rxmode.max_rx_pkt_len = hi->max_packet_bytes;
+      rv = rte_eth_dev_configure
+	(xd->device_index, xd->rx_q_used, xd->tx_q_used, &xd->port_conf);
 
-	  if (xd->flags & DPDK_DEVICE_FLAG_ADMIN_UP)
-	    rte_eth_dev_stop (xd->device_index);
+      if (rv < 0)
+	vlib_cli_output (vlib_get_main (),
+			 "rte_eth_dev_configure[%d]: err %d",
+			 xd->device_index, rv);
 
-	  rv = rte_eth_dev_configure
-	    (xd->device_index, xd->rx_q_used, xd->tx_q_used, &xd->port_conf);
+      rte_eth_dev_set_mtu (xd->device_index, hi->max_packet_bytes);
 
+      if (xd->flags & DPDK_DEVICE_FLAG_ADMIN_UP)
+	{
+	  int rv = rte_eth_dev_start (xd->device_index);
+	  if (!rv && xd->default_mac_address)
+	    rv = rte_eth_dev_default_mac_addr_set (xd->device_index,
+						   (struct ether_addr *)
+						   xd->default_mac_address);
 	  if (rv < 0)
-	    vlib_cli_output (vlib_get_main (),
-			     "rte_eth_dev_configure[%d]: err %d",
-			     xd->device_index, rv);
-
-	  rte_eth_dev_set_mtu (xd->device_index, hi->max_packet_bytes);
-
-	  if (xd->flags & DPDK_DEVICE_FLAG_ADMIN_UP)
-	    {
-	      int rv = rte_eth_dev_start (xd->device_index);
-	      if (!rv && xd->default_mac_address)
-		rv = rte_eth_dev_default_mac_addr_set (xd->device_index,
-						       (struct ether_addr *)
-						       xd->default_mac_address);
-	      if (rv < 0)
-		clib_warning ("rte_eth_dev_start %d returned %d",
-			      xd->device_index, rv);
-	    }
+	    clib_warning ("rte_eth_dev_start %d returned %d",
+			  xd->device_index, rv);
 	}
+
     }
   return old;
 }
@@ -655,11 +634,13 @@ dpdk_lib_init (dpdk_main_t * dm)
 	{
 	  xd->tx_conf.txq_flags |= ETH_TXQ_FLAGS_NOMULTSEGS;
 	  port_conf_template.rxmode.jumbo_frame = 0;
+	  port_conf_template.rxmode.enable_scatter = 0;
 	}
       else
 	{
 	  xd->tx_conf.txq_flags &= ~ETH_TXQ_FLAGS_NOMULTSEGS;
 	  port_conf_template.rxmode.jumbo_frame = 1;
+	  port_conf_template.rxmode.enable_scatter = 1;
 	  xd->flags |= DPDK_DEVICE_FLAG_MAYBE_MULTISEG;
 	}
 
@@ -1065,16 +1046,13 @@ dpdk_lib_init (dpdk_main_t * dm)
       hi = vnet_get_hw_interface (dm->vnet_main, xd->vlib_hw_if_index);
 
       /*
-       * DAW-FIXME: The Cisco VIC firmware does not provide an api for a
-       *            driver to dynamically change the mtu.  If/when the
-       *            VIC firmware gets fixed, then this should be removed.
+       * For cisco VIC vNIC, set default to VLAN strip enabled, unless
+       * specified otherwise in the startup config.
+       * For other NICs default to VLAN strip disabled, unless specified
+       * otherwis in the startup config.
        */
       if (xd->pmd == VNET_DPDK_PMD_ENIC)
 	{
-	  /*
-	   * Initialize mtu to what has been set by CIMC in the firmware cfg.
-	   */
-	  hi->max_packet_bytes = dev_info.max_rx_pktlen;
 	  if (devconf->vlan_strip_offload != DPDK_DEVICE_VLAN_STRIP_OFF)
 	    vlan_strip = 1;	/* remove vlan tag from VIC port by default */
 	  else