[dpdk-dev] [PATCH v2] net/vmxnet3: v4 boot and guest UDP RSS configuration

[Eduard Serra Miralles <eserra@vmware.com>]

From: Eduard Serra <eserra@vmware.com>

This patch introduces:
- VMxnet3 v4 negotiation and,
- entirely guest-driven UDP RSS support.

VMxnet3 v3 already has UDP RSS support, however it
depends on hypervisor provisioning on the VM through
ESX specific flags, which are not transparent or known
to the guest later on.

Vmxnet3 v4 introduces a new API transaction which allows
configuring RSS entirely from the guest. This API must be
invoked after device shared mem region is initialized.

IPv4 ESP RSS (SPI based) is also available, but currently
there are no ESP RSS definitions on rte_eth layer to
handle that.

Signed-off-by: Eduard Serra <eserra@vmware.com>
Acked-by: Yong Wang <yongwang@vmware.com>
---

v2:
* Added missing defines, as we will not merge them separately
---
 drivers/net/vmxnet3/base/vmxnet3_defs.h | 12 ++++++++++
 drivers/net/vmxnet3/vmxnet3_ethdev.c    | 21 ++++++++++++++++-
 drivers/net/vmxnet3/vmxnet3_ethdev.h    |  8 +++++++
 drivers/net/vmxnet3/vmxnet3_rxtx.c      | 40 +++++++++++++++++++++++++++++++++
 4 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vmxnet3/base/vmxnet3_defs.h b/drivers/net/vmxnet3/base/vmxnet3_defs.h
index bbec708..296d7e5 100644
--- a/drivers/net/vmxnet3/base/vmxnet3_defs.h
+++ b/drivers/net/vmxnet3/base/vmxnet3_defs.h
@@ -89,6 +89,7 @@ typedef enum {
    VMXNET3_CMD_RESERVED3,
    VMXNET3_CMD_RESERVED4,
    VMXNET3_CMD_REGISTER_MEMREGS,
+   VMXNET3_CMD_SET_RSS_FIELDS,
 
    VMXNET3_CMD_FIRST_GET = 0xF00D0000,
    VMXNET3_CMD_GET_QUEUE_STATUS = VMXNET3_CMD_FIRST_GET,
@@ -749,6 +750,15 @@ struct Vmxnet3_MemRegs {
 #include "vmware_pack_end.h"
 Vmxnet3_MemRegs;
 
+typedef enum Vmxnet3_RSSField {
+   VMXNET3_RSS_FIELDS_TCPIP4 = 0x0001,
+   VMXNET3_RSS_FIELDS_TCPIP6 = 0x0002,
+   VMXNET3_RSS_FIELDS_UDPIP4 = 0x0004,
+   VMXNET3_RSS_FIELDS_UDPIP6 = 0x0008,
+   VMXNET3_RSS_FIELDS_ESPIP4 = 0x0010,
+   VMXNET3_RSS_FIELDS_ESPIP6 = 0x0020,
+} Vmxnet3_RSSField;
+
 /*
  * If the command data <= 16 bytes, use the shared memory direcly.
  * Otherwise, use the variable length configuration descriptor.
@@ -758,6 +768,8 @@ typedef
 union Vmxnet3_CmdInfo {
    Vmxnet3_VariableLenConfDesc varConf;
    Vmxnet3_SetPolling          setPolling;
+   Vmxnet3_RSSField            setRSSFields;
+   __le16                      reserved[2];
    __le64                      data[2];
 }
 #include "vmware_pack_end.h"
diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.c b/drivers/net/vmxnet3/vmxnet3_ethdev.c
index 93e5de9..846d7fd 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.c
@@ -266,7 +266,11 @@ eth_vmxnet3_dev_init(struct rte_eth_dev *eth_dev)
 	ver = VMXNET3_READ_BAR1_REG(hw, VMXNET3_REG_VRRS);
 	PMD_INIT_LOG(DEBUG, "Hardware version : %d", ver);
 
-	if (ver & (1 << VMXNET3_REV_3)) {
+	if (ver & (1 << VMXNET3_REV_4)) {
+		VMXNET3_WRITE_BAR1_REG(hw, VMXNET3_REG_VRRS,
+				       1 << VMXNET3_REV_4);
+		hw->version = VMXNET3_REV_4 + 1;
+	} else if (ver & (1 << VMXNET3_REV_3)) {
 		VMXNET3_WRITE_BAR1_REG(hw, VMXNET3_REG_VRRS,
 				       1 << VMXNET3_REV_3);
 		hw->version = VMXNET3_REV_3 + 1;
@@ -764,6 +768,15 @@ vmxnet3_dev_start(struct rte_eth_dev *dev)
 		PMD_INIT_LOG(DEBUG, "Failed to setup memory region\n");
 	}
 
+	if (VMXNET3_VERSION_GE_4(hw)) {
+		/* Check for additional RSS  */
+		ret = vmxnet3_v4_rss_configure(dev);
+		if (ret != VMXNET3_SUCCESS) {
+			PMD_INIT_LOG(ERR, "Failed to configure v4 RSS");
+			return ret;
+		}
+	}
+
 	/* Disable interrupts */
 	vmxnet3_disable_intr(hw);
 
@@ -1141,6 +1154,8 @@ static void
 vmxnet3_dev_info_get(struct rte_eth_dev *dev __rte_unused,
 		     struct rte_eth_dev_info *dev_info)
 {
+	struct vmxnet3_hw *hw = dev->data->dev_private;
+
 	dev_info->max_rx_queues = VMXNET3_MAX_RX_QUEUES;
 	dev_info->max_tx_queues = VMXNET3_MAX_TX_QUEUES;
 	dev_info->min_rx_bufsize = 1518 + RTE_PKTMBUF_HEADROOM;
@@ -1150,6 +1165,10 @@ vmxnet3_dev_info_get(struct rte_eth_dev *dev __rte_unused,
 
 	dev_info->flow_type_rss_offloads = VMXNET3_RSS_OFFLOAD_ALL;
 
+	if (VMXNET3_VERSION_GE_4(hw)) {
+		dev_info->flow_type_rss_offloads |= VMXNET3_V4_RSS_MASK;
+	}
+
 	dev_info->rx_desc_lim = (struct rte_eth_desc_lim) {
 		.nb_max = VMXNET3_RX_RING_MAX_SIZE,
 		.nb_min = VMXNET3_DEF_RX_RING_SIZE,
diff --git a/drivers/net/vmxnet3/vmxnet3_ethdev.h b/drivers/net/vmxnet3/vmxnet3_ethdev.h
index 5bc3a84..319d739 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethdev.h
+++ b/drivers/net/vmxnet3/vmxnet3_ethdev.h
@@ -34,6 +34,10 @@
 	ETH_RSS_IPV6 | \
 	ETH_RSS_NONFRAG_IPV6_TCP)
 
+#define VMXNET3_V4_RSS_MASK ( \
+	ETH_RSS_NONFRAG_IPV4_UDP | \
+	ETH_RSS_NONFRAG_IPV6_UDP)
+
 /* RSS configuration structure - shared with device through GPA */
 typedef struct VMXNET3_RSSConf {
 	uint16_t   hashType;
@@ -103,10 +107,12 @@ struct vmxnet3_hw {
 	UPT1_RxStats          snapshot_rx_stats[VMXNET3_MAX_RX_QUEUES];
 };
 
+#define VMXNET3_REV_4		3		/* Vmxnet3 Rev. 4 */
 #define VMXNET3_REV_3		2		/* Vmxnet3 Rev. 3 */
 #define VMXNET3_REV_2		1		/* Vmxnet3 Rev. 2 */
 #define VMXNET3_REV_1		0		/* Vmxnet3 Rev. 1 */
 
+#define VMXNET3_VERSION_GE_4(hw) ((hw)->version >= VMXNET3_REV_4 + 1)
 #define VMXNET3_VERSION_GE_3(hw) ((hw)->version >= VMXNET3_REV_3 + 1)
 #define VMXNET3_VERSION_GE_2(hw) ((hw)->version >= VMXNET3_REV_2 + 1)
 
@@ -162,6 +168,8 @@ void vmxnet3_dev_clear_queues(struct rte_eth_dev *dev);
 void vmxnet3_dev_rx_queue_release(void *rxq);
 void vmxnet3_dev_tx_queue_release(void *txq);
 
+int vmxnet3_v4_rss_configure(struct rte_eth_dev *dev);
+
 int  vmxnet3_dev_rx_queue_setup(struct rte_eth_dev *dev, uint16_t rx_queue_id,
 				uint16_t nb_rx_desc, unsigned int socket_id,
 				const struct rte_eth_rxconf *rx_conf,
diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index d30914a..4867a64 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -1292,6 +1292,46 @@ static uint8_t rss_intel_key[40] = {
 };
 
 /*
+ * Additional RSS configurations based on vmxnet v4+ APIs
+ */
+int
+vmxnet3_v4_rss_configure(struct rte_eth_dev *dev)
+{
+	struct vmxnet3_hw *hw = dev->data->dev_private;
+	Vmxnet3_DriverShared *shared = hw->shared;
+	Vmxnet3_CmdInfo *cmdInfo = &shared->cu.cmdInfo;
+	struct rte_eth_rss_conf *port_rss_conf;
+	uint64_t rss_hf;
+	uint32_t ret;
+
+	PMD_INIT_FUNC_TRACE();
+
+	cmdInfo->setRSSFields = 0;
+	port_rss_conf = &dev->data->dev_conf.rx_adv_conf.rss_conf;
+	rss_hf = port_rss_conf->rss_hf &
+		(VMXNET3_V4_RSS_MASK | VMXNET3_RSS_OFFLOAD_ALL);
+
+	if (rss_hf & ETH_RSS_NONFRAG_IPV4_TCP)
+		cmdInfo->setRSSFields |= VMXNET3_RSS_FIELDS_TCPIP4;
+	if (rss_hf & ETH_RSS_NONFRAG_IPV6_TCP)
+		cmdInfo->setRSSFields |= VMXNET3_RSS_FIELDS_TCPIP6;
+	if (rss_hf & ETH_RSS_NONFRAG_IPV4_UDP)
+		cmdInfo->setRSSFields |= VMXNET3_RSS_FIELDS_UDPIP4;
+	if (rss_hf & ETH_RSS_NONFRAG_IPV6_UDP)
+		cmdInfo->setRSSFields |= VMXNET3_RSS_FIELDS_UDPIP6;
+
+	VMXNET3_WRITE_BAR1_REG(hw, VMXNET3_REG_CMD,
+			       VMXNET3_CMD_SET_RSS_FIELDS);
+	ret = VMXNET3_READ_BAR1_REG(hw, VMXNET3_REG_CMD);
+
+	if (ret != VMXNET3_SUCCESS) {
+		PMD_DRV_LOG(ERR, "Set RSS fields (v4) failed: %d", ret);
+	}
+
+	return ret;
+}
+
+/*
  * Configure RSS feature
  */
 int
-- 
2.7.4