Dropless_Fc; Rss; Max_Vfs; Enable_Vxlan_Offld - Qlogic 8400 Series User Manual

6–VMware Driver Software
Networking Support

dropless_fc

The optional parameter dropless_fc can be used to enable a complementary flow
control mechanism on QLogic network adapters. The default flow control
mechanism is to send pause frames when the BRB is reaching a certain level of
occupancy. This is a performance targeted flow control mechanism. On QLogic
network adapters, you can enable another flow control mechanism to send pause
frames if one of the host buffers (when in RSS mode) is exhausted. This is a zero
packet drop targeted flow control mechanism.
Set the dropless_fc parameter to 1 as shown below to enable the dropless flow
control mechanism feature on all QLogic network adapters in the system.
vmkload_mod bnx2x dropless_fc=1

RSS

The optional parameter RSS can be used to specify the number of receive side
scaling queues. For VMware ESXi (5.1, 5.5, 6.0), values for RSS can be from 2 to
4; RSS=1 disables RSS queues.

max_vfs

The optional parameter max_vfs can be used to enable a specific number of
virtual functions. Values for max_vfs can be 1 to 64, or set max_vfs=0 (default) to
disable all virtual functions.

enable_vxlan_offld

The optional parameter enable_vxlan_ofld can be used to enable VMware ESXi
(5.5, 6.0) VxLAN task offloads with TX TSO and TX CSO. For VMware ESXi
(5.5, 6.0), enable_vxlan_ofld=1 (default) enables VxLAN task offloads;
enable_vxlan_offload=0 disables VxLAN task offloads.

Driver Defaults

Speed: Autonegotiation with all speeds advertised
Flow Control: Autonegotiation with rx and tx advertised
MTU: 1500 (range 46–9600)
Rx Ring Size: 4078 (range 0–4078)
Tx Ring Size: 4078 (range (MAX_SKB_FRAGS+4) - 4078). MAX_SKB_FRAGS
varies on different kernels and different architectures. On a 2.6 kernel for x86,
MAX_SKB_FRAGS is 18.
Coalesce RX Microseconds: 25 (range 0–3000)
Coalesce TX Microseconds: 50 (range 0–12288)
MSI-X: Enabled (if supported by 2.6 kernel)
TSO: Enabled
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