[PATCH v6 4/8] virtio: Introduce config RTE_VIRTIO_INC_VECTOR

[Santosh Shukla <sshukla@mvista.com>]

- virtio_recv_pkts_vec and other virtio vector friend apis are written for
  sse/avx instructions. For arm64 in particular, virtio vector implementation
  does not exist(todo).

So virtio pmd driver wont build for targets like i686, arm64.  By making
RTE_VIRTIO_INC_VECTOR=n, Driver can build for non-sse/avx targets and will work
in non-vectored virtio mode.

Disabling RTE_VIRTIO_INC_VECTOR config for :

- i686 arch as i686 target config says:
  config/defconfig_i686-native-linuxapp-gcc says "Vectorized PMD is not
  supported on 32-bit".

- armv7/v8 arch.

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
---
v4--> v5:
- squashed v4's RTE_VIRTIO_INC_VECTOR patches into one patch.
- Added ifdefs RTE_xx_xx_INC_VECTOR across _simple_rx_tx flag occurance in code.


 config/common_linuxapp                     |    1 +
 config/defconfig_arm-armv7a-linuxapp-gcc   |    4 +++-
 config/defconfig_arm64-armv8a-linuxapp-gcc |    4 +++-
 config/defconfig_i686-native-linuxapp-gcc  |    1 +
 config/defconfig_i686-native-linuxapp-icc  |    1 +
 drivers/net/virtio/Makefile                |    2 +-
 drivers/net/virtio/virtio_rxtx.c           |   16 +++++++++++++++-
 drivers/net/virtio/virtio_rxtx.h           |    2 ++
 8 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/config/common_linuxapp b/config/common_linuxapp
index 74bc515..8677697 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -274,6 +274,7 @@ CONFIG_RTE_LIBRTE_VIRTIO_DEBUG_RX=n
 CONFIG_RTE_LIBRTE_VIRTIO_DEBUG_TX=n
 CONFIG_RTE_LIBRTE_VIRTIO_DEBUG_DRIVER=n
 CONFIG_RTE_LIBRTE_VIRTIO_DEBUG_DUMP=n
+CONFIG_RTE_VIRTIO_INC_VECTOR=y
 
 #
 # Compile burst-oriented VMXNET3 PMD driver
diff --git a/config/defconfig_arm-armv7a-linuxapp-gcc b/config/defconfig_arm-armv7a-linuxapp-gcc
index cbebd64..9f852ce 100644
--- a/config/defconfig_arm-armv7a-linuxapp-gcc
+++ b/config/defconfig_arm-armv7a-linuxapp-gcc
@@ -43,6 +43,9 @@ CONFIG_RTE_FORCE_INTRINSICS=y
 CONFIG_RTE_TOOLCHAIN="gcc"
 CONFIG_RTE_TOOLCHAIN_GCC=y
 
+# Disable VIRTIO VECTOR support
+CONFIG_RTE_VIRTIO_INC_VECTOR=n
+
 # ARM doesn't have support for vmware TSC map
 CONFIG_RTE_LIBRTE_EAL_VMWARE_TSC_MAP_SUPPORT=n
 
@@ -70,7 +73,6 @@ CONFIG_RTE_LIBRTE_I40E_PMD=n
 CONFIG_RTE_LIBRTE_IXGBE_PMD=n
 CONFIG_RTE_LIBRTE_MLX4_PMD=n
 CONFIG_RTE_LIBRTE_MPIPE_PMD=n
-CONFIG_RTE_LIBRTE_VIRTIO_PMD=n
 CONFIG_RTE_LIBRTE_VMXNET3_PMD=n
 CONFIG_RTE_LIBRTE_PMD_XENVIRT=n
 CONFIG_RTE_LIBRTE_PMD_BNX2X=n
diff --git a/config/defconfig_arm64-armv8a-linuxapp-gcc b/config/defconfig_arm64-armv8a-linuxapp-gcc
index 504f3ed..1a638b3 100644
--- a/config/defconfig_arm64-armv8a-linuxapp-gcc
+++ b/config/defconfig_arm64-armv8a-linuxapp-gcc
@@ -45,8 +45,10 @@ CONFIG_RTE_TOOLCHAIN_GCC=y
 
 CONFIG_RTE_CACHE_LINE_SIZE=64
 
+# Disable VIRTIO VECTOR support
+CONFIG_RTE_VIRTIO_INC_VECTOR=n
+
 CONFIG_RTE_IXGBE_INC_VECTOR=n
-CONFIG_RTE_LIBRTE_VIRTIO_PMD=n
 CONFIG_RTE_LIBRTE_IVSHMEM=n
 CONFIG_RTE_LIBRTE_FM10K_PMD=n
 CONFIG_RTE_LIBRTE_I40E_PMD=n
diff --git a/config/defconfig_i686-native-linuxapp-gcc b/config/defconfig_i686-native-linuxapp-gcc
index a90de9b..a4b1c49 100644
--- a/config/defconfig_i686-native-linuxapp-gcc
+++ b/config/defconfig_i686-native-linuxapp-gcc
@@ -49,3 +49,4 @@ CONFIG_RTE_LIBRTE_KNI=n
 # Vectorized PMD is not supported on 32-bit
 #
 CONFIG_RTE_IXGBE_INC_VECTOR=n
+CONFIG_RTE_VIRTIO_INC_VECTOR=n
diff --git a/config/defconfig_i686-native-linuxapp-icc b/config/defconfig_i686-native-linuxapp-icc
index c021321..f8eb6ad 100644
--- a/config/defconfig_i686-native-linuxapp-icc
+++ b/config/defconfig_i686-native-linuxapp-icc
@@ -49,3 +49,4 @@ CONFIG_RTE_LIBRTE_KNI=n
 # Vectorized PMD is not supported on 32-bit
 #
 CONFIG_RTE_IXGBE_INC_VECTOR=n
+CONFIG_RTE_VIRTIO_INC_VECTOR=n
diff --git a/drivers/net/virtio/Makefile b/drivers/net/virtio/Makefile
index 43835ba..25a842d 100644
--- a/drivers/net/virtio/Makefile
+++ b/drivers/net/virtio/Makefile
@@ -50,7 +50,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtqueue.c
 SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_pci.c
 SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx.c
 SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_ethdev.c
-SRCS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio_rxtx_simple.c
+SRCS-$(CONFIG_RTE_VIRTIO_INC_VECTOR) += virtio_rxtx_simple.c
 
 # this lib depends upon:
 DEPDIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += lib/librte_eal lib/librte_ether
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index 41a1366..d8169d1 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c
@@ -67,7 +67,9 @@
 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
 	ETH_TXQ_FLAGS_NOOFFLOADS)
 
+#ifdef RTE_VIRTIO_INC_VECTOR
 static int use_simple_rxtx;
+#endif
 
 static void
 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
@@ -307,12 +309,13 @@ virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
 		nbufs = 0;
 		error = ENOSPC;
 
+#ifdef RTE_VIRTIO_INC_VECTOR
 		if (use_simple_rxtx)
 			for (i = 0; i < vq->vq_nentries; i++) {
 				vq->vq_ring.avail->ring[i] = i;
 				vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
 			}
-
+#endif
 		memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
 		for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
 			vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
@@ -325,9 +328,11 @@ virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
 			/******************************************
 			*         Enqueue allocated buffers        *
 			*******************************************/
+#ifdef RTE_VIRTIO_INC_VECTOR
 			if (use_simple_rxtx)
 				error = virtqueue_enqueue_recv_refill_simple(vq, m);
 			else
+#endif
 				error = virtqueue_enqueue_recv_refill(vq, m);
 			if (error) {
 				rte_pktmbuf_free(m);
@@ -340,6 +345,7 @@ virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
 
 		PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 	} else if (queue_type == VTNET_TQ) {
+#ifdef RTE_VIRTIO_INC_VECTOR
 		if (use_simple_rxtx) {
 			int mid_idx  = vq->vq_nentries >> 1;
 			for (i = 0; i < mid_idx; i++) {
@@ -357,6 +363,7 @@ virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
 			for (i = mid_idx; i < vq->vq_nentries; i++)
 				vq->vq_ring.avail->ring[i] = i;
 		}
+#endif
 	}
 }
 
@@ -423,7 +430,9 @@ virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 
 	dev->data->rx_queues[queue_idx] = vq;
 
+#ifdef RTE_VIRTIO_INC_VECTOR
 	virtio_rxq_vec_setup(vq);
+#endif
 
 	return 0;
 }
@@ -449,7 +458,10 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 			const struct rte_eth_txconf *tx_conf)
 {
 	uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
+
+#ifdef RTE_VIRTIO_INC_VECTOR
 	struct virtio_hw *hw = dev->data->dev_private;
+#endif
 	struct virtqueue *vq;
 	uint16_t tx_free_thresh;
 	int ret;
@@ -462,6 +474,7 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 		return -EINVAL;
 	}
 
+#ifdef RTE_VIRTIO_INC_VECTOR
 	/* Use simple rx/tx func if single segment and no offloads */
 	if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
 	     !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
@@ -470,6 +483,7 @@ virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 		dev->rx_pkt_burst = virtio_recv_pkts_vec;
 		use_simple_rxtx = 1;
 	}
+#endif
 
 	ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
 			nb_desc, socket_id, &vq);
diff --git a/drivers/net/virtio/virtio_rxtx.h b/drivers/net/virtio/virtio_rxtx.h
index 831e492..9be1378 100644
--- a/drivers/net/virtio/virtio_rxtx.h
+++ b/drivers/net/virtio/virtio_rxtx.h
@@ -33,7 +33,9 @@
 
 #define RTE_PMD_VIRTIO_RX_MAX_BURST 64
 
+#ifdef RTE_VIRTIO_INC_VECTOR
 int virtio_rxq_vec_setup(struct virtqueue *rxq);
 
 int virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
 	struct rte_mbuf *m);
+#endif
-- 
1.7.9.5