[dpdk-dev] [PATCH v3 4/7] ethdev: introduce enable_scatter rx mode

[David Marchand <david.marchand@6wind.com>]

We might want to be sure the scatter packets reception handler is selected in a
pmd. This makes it possible to then change mtu later, without the need of
restarting a port.
It is then the pmd duty to tell it enabled the scatter reception handler by
setting dev->data->scattered_rx to 1.

Signed-off-by: David Marchand <david.marchand@6wind.com>
---
 lib/librte_ether/rte_ethdev.h     |    3 ++-
 lib/librte_pmd_e1000/em_rxtx.c    |    5 +++++
 lib/librte_pmd_e1000/igb_rxtx.c   |   10 ++++++++++
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c |   10 ++++++++++
 4 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 581259d..2b98700 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -307,7 +307,8 @@ struct rte_eth_rxmode {
 		hw_vlan_strip    : 1, /**< VLAN strip enable. */
 		hw_vlan_extend   : 1, /**< Extended VLAN enable. */
 		jumbo_frame      : 1, /**< Jumbo Frame Receipt enable. */
-		hw_strip_crc     : 1; /**< Enable CRC stripping by hardware. */
+		hw_strip_crc     : 1, /**< Enable CRC stripping by hardware. */
+		enable_scatter   : 1; /**< Enable scatter packets rx handler */
 };
 
 /**
diff --git a/lib/librte_pmd_e1000/em_rxtx.c b/lib/librte_pmd_e1000/em_rxtx.c
index 1575e79..e5f1933 100644
--- a/lib/librte_pmd_e1000/em_rxtx.c
+++ b/lib/librte_pmd_e1000/em_rxtx.c
@@ -1714,6 +1714,11 @@ eth_em_rx_init(struct rte_eth_dev *dev)
 		}
 	}
 
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		dev->rx_pkt_burst = eth_em_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
 	/*
 	 * Setup the Checksum Register.
 	 * Receive Full-Packet Checksum Offload is mutually exclusive with RSS.
diff --git a/lib/librte_pmd_e1000/igb_rxtx.c b/lib/librte_pmd_e1000/igb_rxtx.c
index 9f0310d..aea898c 100644
--- a/lib/librte_pmd_e1000/igb_rxtx.c
+++ b/lib/librte_pmd_e1000/igb_rxtx.c
@@ -2008,6 +2008,11 @@ eth_igb_rx_init(struct rte_eth_dev *dev)
 		E1000_WRITE_REG(hw, E1000_RXDCTL(rxq->reg_idx), rxdctl);
 	}
 
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
 	/*
 	 * Setup BSIZE field of RCTL register, if needed.
 	 * Buffer sizes >= 1024 are not [supposed to be] setup in the RCTL
@@ -2277,6 +2282,11 @@ eth_igbvf_rx_init(struct rte_eth_dev *dev)
 		E1000_WRITE_REG(hw, E1000_RXDCTL(i), rxdctl);
 	}
 
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		dev->rx_pkt_burst = eth_igb_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
 	/*
 	 * Setup the HW Rx Head and Tail Descriptor Pointers.
 	 * This needs to be done after enable.
diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
index ca72e75..f487859 100644
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx.c
@@ -3486,6 +3486,11 @@ ixgbe_dev_rx_init(struct rte_eth_dev *dev)
 		}
 	}
 
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
 	/*
 	 * Device configured with multiple RX queues.
 	 */
@@ -3961,6 +3966,11 @@ ixgbevf_dev_rx_init(struct rte_eth_dev *dev)
 		}
 	}
 
+	if (dev->data->dev_conf.rxmode.enable_scatter) {
+		dev->rx_pkt_burst = ixgbe_recv_scattered_pkts;
+		dev->data->scattered_rx = 1;
+	}
+
 	return 0;
 }
 
-- 
1.7.10.4