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SubjectRe: [PATCH v2 net-next 2/4] vmxnet3: add support to get/set rx flow hash
On Thu, May 28, 2020 at 11:36:13AM -0700, Ronak Doshi wrote:
> With vmxnet3 version 4, the emulation supports multiqueue(RSS) for
> UDP and ESP traffic. A guest can enable/disable RSS for UDP/ESP over
> IPv4/IPv6 by issuing commands introduced in this patch. ESP ipv6 is
> not yet supported in this patch.
>
> This patch implements get_rss_hash_opts and set_rss_hash_opts
> methods to allow querying and configuring different Rx flow hash
> configurations.
>
> Signed-off-by: Ronak Doshi <doshir@vmware.com>
> ---
[...]
> diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
> index 1163eca7aba5..83cec9946466 100644
> --- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
> +++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
> @@ -665,18 +665,237 @@ vmxnet3_set_ringparam(struct net_device *netdev,
> return err;
> }
>
> +static int
> +vmxnet3_get_rss_hash_opts(struct vmxnet3_adapter *adapter,
> + struct ethtool_rxnfc *info)
> +{
> + enum Vmxnet3_RSSField rss_fields;
> +
> + if (netif_running(adapter->netdev)) {
> + unsigned long flags;
> +
> + spin_lock_irqsave(&adapter->cmd_lock, flags);
> +
> + VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
> + VMXNET3_CMD_GET_RSS_FIELDS);
> + rss_fields = VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
> + spin_unlock_irqrestore(&adapter->cmd_lock, flags);
> + } else {
> + rss_fields = adapter->rss_fields;
> + }
> +
> + info->data = 0;
> +
> + /* Report default options for RSS on vmxnet3 */
> + switch (info->flow_type) {
> + case TCP_V4_FLOW:
> + if (rss_fields & VMXNET3_RSS_FIELDS_TCPIP4)
> + info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3 |
> + RXH_IP_SRC | RXH_IP_DST;
> + break;
> + case UDP_V4_FLOW:
> + if (rss_fields & VMXNET3_RSS_FIELDS_UDPIP4)
> + info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3 |
> + RXH_IP_SRC | RXH_IP_DST;
> + break;
> + case AH_ESP_V4_FLOW:
> + case AH_V4_FLOW:
> + case ESP_V4_FLOW:
> + if (rss_fields & VMXNET3_RSS_FIELDS_ESPIP4)
> + info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3;
> + /* fallthrough */
> + case SCTP_V4_FLOW:
> + case IPV4_FLOW:
> + info->data |= RXH_IP_SRC | RXH_IP_DST;
> + break;
> + case TCP_V6_FLOW:
> + if (rss_fields & VMXNET3_RSS_FIELDS_TCPIP6)
> + info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3 |
> + RXH_IP_SRC | RXH_IP_DST;
> + break;
> + case UDP_V6_FLOW:
> + if (rss_fields & VMXNET3_RSS_FIELDS_UDPIP6)
> + info->data |= RXH_L4_B_0_1 | RXH_L4_B_2_3 |
> + RXH_IP_SRC | RXH_IP_DST;
> + break;
> + case AH_ESP_V6_FLOW:
> + case AH_V6_FLOW:
> + case ESP_V6_FLOW:
> + case SCTP_V6_FLOW:
> + case IPV6_FLOW:
> + info->data |= RXH_IP_SRC | RXH_IP_DST;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int
> +vmxnet3_set_rss_hash_opt(struct net_device *netdev,
> + struct vmxnet3_adapter *adapter,
> + struct ethtool_rxnfc *nfc)
> +{
> + enum Vmxnet3_RSSField rss_fields = adapter->rss_fields;
> +
> + /* RSS does not support anything other than hashing
> + * to queues on src and dst IPs and ports
> + */
> + if (nfc->data & ~(RXH_IP_SRC | RXH_IP_DST |
> + RXH_L4_B_0_1 | RXH_L4_B_2_3))
> + return -EINVAL;
> +
> + switch (nfc->flow_type) {
> + case TCP_V4_FLOW:
> + case TCP_V6_FLOW:
> + if (!(nfc->data & RXH_IP_SRC) ||
> + !(nfc->data & RXH_IP_DST) ||
> + !(nfc->data & RXH_L4_B_0_1) ||
> + !(nfc->data & RXH_L4_B_2_3))
> + return -EINVAL;
> + break;

This still suffers from the inconsistency between get and set handler
I already pointed out in v1:

- there is no way to change VMXNET3_RSS_FIELDS_TCPIP{4,6} bits
- get_rxnfc() may return value that set_rxnfc() won't accept
- get_rxnfc() may return different value than set_rxnfc() set

Above, vmxnet3_get_rss_hash_opts() returns 0 or
RXH_L4_B_0_1 | RXH_L4_B_2_3 | RXH_IP_SRC | RXH_IP_DST for any of
{TCP,UDP}_V{4,6}_FLOW, depending on corresponding bit in rss_fields. But
here you accept only all four bits for TCP (both v4 and v6) and either
the two RXH_IP_* bits or all four for UDP.

Michal

> + case UDP_V4_FLOW:
> + if (!(nfc->data & RXH_IP_SRC) ||
> + !(nfc->data & RXH_IP_DST))
> + return -EINVAL;
> + switch (nfc->data & (RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
> + case 0:
> + rss_fields &= ~VMXNET3_RSS_FIELDS_UDPIP4;
> + break;
> + case (RXH_L4_B_0_1 | RXH_L4_B_2_3):
> + rss_fields |= VMXNET3_RSS_FIELDS_UDPIP4;
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case UDP_V6_FLOW:
> + if (!(nfc->data & RXH_IP_SRC) ||
> + !(nfc->data & RXH_IP_DST))
> + return -EINVAL;
> + switch (nfc->data & (RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
> + case 0:
> + rss_fields &= ~VMXNET3_RSS_FIELDS_UDPIP6;
> + break;
> + case (RXH_L4_B_0_1 | RXH_L4_B_2_3):
> + rss_fields |= VMXNET3_RSS_FIELDS_UDPIP6;
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case ESP_V4_FLOW:
> + case AH_V4_FLOW:
> + case AH_ESP_V4_FLOW:
> + if (!(nfc->data & RXH_IP_SRC) ||
> + !(nfc->data & RXH_IP_DST))
> + return -EINVAL;
> + switch (nfc->data & (RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
> + case 0:
> + rss_fields &= ~VMXNET3_RSS_FIELDS_ESPIP4;
> + break;
> + case (RXH_L4_B_0_1 | RXH_L4_B_2_3):
> + rss_fields |= VMXNET3_RSS_FIELDS_ESPIP4;
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> + case ESP_V6_FLOW:
> + case AH_V6_FLOW:
> + case AH_ESP_V6_FLOW:
> + case SCTP_V4_FLOW:
> + case SCTP_V6_FLOW:
> + if (!(nfc->data & RXH_IP_SRC) ||
> + !(nfc->data & RXH_IP_DST) ||
> + (nfc->data & RXH_L4_B_0_1) ||
> + (nfc->data & RXH_L4_B_2_3))
> + return -EINVAL;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + /* if we changed something we need to update flags */
> + if (rss_fields != adapter->rss_fields) {
> + adapter->default_rss_fields = false;
> + if (netif_running(netdev)) {
> + struct Vmxnet3_DriverShared *shared = adapter->shared;
> + union Vmxnet3_CmdInfo *cmdInfo = &shared->cu.cmdInfo;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&adapter->cmd_lock, flags);
> + cmdInfo->setRssFields = rss_fields;
> + VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
> + VMXNET3_CMD_SET_RSS_FIELDS);
> +
> + /* Not all requested RSS may get applied, so get and
> + * cache what was actually applied.
> + */
> + VMXNET3_WRITE_BAR1_REG(adapter, VMXNET3_REG_CMD,
> + VMXNET3_CMD_GET_RSS_FIELDS);
> + adapter->rss_fields =
> + VMXNET3_READ_BAR1_REG(adapter, VMXNET3_REG_CMD);
> + spin_unlock_irqrestore(&adapter->cmd_lock, flags);
> + } else {
> + /* When the device is activated, we will try to apply
> + * these rules and cache the applied value later.
> + */
> + adapter->rss_fields = rss_fields;
> + }
> + }
> + return 0;
> +}
[...]

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