The following table lists the available parameters in the AMD Solarflare Linux driver module.
Important: The availability of module parameters and their
effectiveness depends on which driver version and AMD Solarflare adapter you have
installed.
You can list the parameters available on your server with the following command:
modinfo sfc| Parameter | Description | Possible Value | Default Value |
|---|---|---|---|
| efx_allow_nvconfig_writes | Allow access to static config and backup firmware. | bool | 1 |
| max_vfs |
Specify the number of VFs initialized by the driver:
|
array of int | 0 |
| vf_count | Duplicate of the max_vfs parameter. | array of int | 0 |
| enable_vswitch | Force allocation of a VEB vswitch on supported adapters. | bool | 0 |
| vfs_vlan_restrict | Restrict VLANs usage on VFs. VF driver must use HW VLAN filtering to get VLAN tagged traffic. | bool | 0 |
| mcdi_logging_default | Enable MCDI logging on newly-probed functions. | bool | 0 |
| mcdi_log_commands | Specify which MCDI commands to log when logging is enabled. Comma or space separated list of hex values, for example. 'b,4c'. An empty string logs all commands. | string | <empty> |
| rx_refill_threshold | RX descriptor ring fast/slow fill threshold (%). | uint | 90 |
| rx_recycle_ring_size | Maximum number of RX buffers to recycle pages for. | uint | 256 buffers per 10 Gb/s maximum adapter speed |
| underreport_skb_truesize | Give false skb truesizes. Debug option to restore previous driver behavior. | bool | 0 |
| rx_copybreak | Size of headers copied into skb linear data area. | uint | 192 |
| lro_table_size 1 | Size of the LRO hash table. Must be a power of 2. | uint | 128 |
| lro_chain_max 1 | Maximum length of chains in the LRO hash table. | uint | 20 |
| lro_idle_jiffies 1 | Time (in jiffies) after which an idle connection's LRO state is discarded. | uint | 101 |
| lro_slow_start_packets 1 | Number of packets that must pass in-order before starting LRO. | uint | 20000 |
| lro_loss_packets 1 | Number of packets that must pass in-order following loss before restarting LRO. | uint | 20 |
| tx_copybreak | Maximum size of packet that can be copied to a new buffer on transmit, minimum is 16 bytes or 0 to disable. | uint | 128 |
| piobuf_size |
Maximum size of packet that can be copied to a PIO buffer on transmit. Setting this to zero effectively disables PIO. Only effective on adapters with PIO. |
uint | 256 bytes |
| tx_push_max_fill | Only use TX push when the queue is below this fill level:
|
uint | 0xffffffff |
| tx_coalesce_doorbell | Coalesce notification to NIC of pending TX data. When set this option sets tx_push_max_fill=0. | bool | 0 |
| multicast_chaining | Enabled multicast filter chaining in firmware. | bool | 1 |
| monitor_hw_available | Check hardware availability during periodic monitor. | bool | 0 |
| tx_non_csum_queue | Allocate dedicated TX queues for traffic not requiring checksum offload. | bool | 0 |
| num_vis | The number of extra VIs to allocate for Onload. | int | -1 |
| rss_use_fixed_key | Use a fixed RSS hash key, tested for reliable spreading across channels. | bool | 1 |
| rss_cpus | Number of CPUs to use for Receive-Side Scaling, or 'packages', 'cores', 'hyperthreads', 'numa_local_cores', or 'numa_local_hyperthreads'. | string | <empty> |
| rss_numa_local |
Restrict RSS to use CPU cores on the NUMA node local to the X4 series adapter. Set to 1 to restrict, 0 otherwise. |
bool | 1 |
| irq_adapt_low_thresh | Threshold score for reducing IRQ moderation. | uint | 10000 |
| irq_adapt_high_thresh | Threshold score for increasing IRQ moderation. | uint | 20000 |
| irq_adapt_irqs | Number of IRQs per IRQ moderation adaptation. | uint | 1000 |
| napi_weight | NAPI weighting. | int | 64 |
| auto_config_xps | Toggle automatic XPS configuration. | bool | 1 |
| irq_set_affinity | Set SMP affinity of IRQs to support RSS (N⇒disabled, Y⇒enabled (default)). | bool | 1 |
| debug | Bitmapped debugging message enable value. | uint | (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP | NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR | NETIF_MSG_HW) |
| monitor_interval_ms | Bus state test interval in ms. | uint | 200 |
| phy_power_follows_link | Power down phy when interface is administratively down. | bool | 0 |
| link_down_on_reset | Signal the link down and up on resets. | bool | 0 |
| xdp_alloc_tx_resources | [EXPERIMENTAL] Allocate resources for XDP TX. | bool | 0 |
| lro | Large receive offload acceleration. | bool | 1 |
| irq_adapt_enable | Enable adaptive interrupt moderation. | bool | 1 |
| rx_ring | Maximum number of descriptors in a receive ring. | uint | 1024 |
| tx_ring | Maximum number of descriptors in a transmit ring. | uint | 1024 |
| performance_profile | Tune settings for different performance profiles: 'throughput', 'latency' or 'auto'. | string | auto |
| rx_irq_mod_usec | Receive interrupt moderation (microseconds). | uint | 60 |
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