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| author | Subbaraya Sundeep <sbhatta@marvell.com> | 2022-02-23 00:09:12 +0530 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-02-23 20:33:05 -0800 |
| commit | 1241e329ce2e1f5b1039fd356b75867b29721ad2 (patch) | |
| tree | d4d44ec0bb8a645e930440c762b8a7e6930daab5 /Documentation/networking/ethtool-netlink.rst | |
| parent | 6a47cdc38143f7b62af2768181462597da04df0f (diff) | |
| download | linux-1241e329ce2e1f5b1039fd356b75867b29721ad2.tar.bz2 | |
ethtool: add support to set/get completion queue event size
Add support to set completion queue event size via ethtool -G
parameter and get it via ethtool -g parameter.
~ # ./ethtool -G eth0 cqe-size 512
~ # ./ethtool -g eth0
Ring parameters for eth0:
Pre-set maximums:
RX: 1048576
RX Mini: n/a
RX Jumbo: n/a
TX: 1048576
Current hardware settings:
RX: 256
RX Mini: n/a
RX Jumbo: n/a
TX: 4096
RX Buf Len: 2048
CQE Size: 128
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'Documentation/networking/ethtool-netlink.rst')
| -rw-r--r-- | Documentation/networking/ethtool-netlink.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/networking/ethtool-netlink.rst b/Documentation/networking/ethtool-netlink.rst index cae28af7a476..24d9be69065d 100644 --- a/Documentation/networking/ethtool-netlink.rst +++ b/Documentation/networking/ethtool-netlink.rst @@ -861,6 +861,7 @@ Kernel response contents: ``ETHTOOL_A_RINGS_TX`` u32 size of TX ring ``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring ``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` u8 TCP header / data split + ``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE ==================================== ====== =========================== ``ETHTOOL_A_RINGS_TCP_DATA_SPLIT`` indicates whether the device is usable with @@ -885,6 +886,7 @@ Request contents: ``ETHTOOL_A_RINGS_RX_JUMBO`` u32 size of RX jumbo ring ``ETHTOOL_A_RINGS_TX`` u32 size of TX ring ``ETHTOOL_A_RINGS_RX_BUF_LEN`` u32 size of buffers on the ring + ``ETHTOOL_A_RINGS_CQE_SIZE`` u32 Size of TX/RX CQE ==================================== ====== =========================== Kernel checks that requested ring sizes do not exceed limits reported by @@ -892,6 +894,15 @@ driver. Driver may impose additional constraints and may not suspport all attributes. +``ETHTOOL_A_RINGS_CQE_SIZE`` specifies the completion queue event size. +Completion queue events(CQE) are the events posted by NIC to indicate the +completion status of a packet when the packet is sent(like send success or +error) or received(like pointers to packet fragments). The CQE size parameter +enables to modify the CQE size other than default size if NIC supports it. +A bigger CQE can have more receive buffer pointers inturn NIC can transfer +a bigger frame from wire. Based on the NIC hardware, the overall completion +queue size can be adjusted in the driver if CQE size is modified. + CHANNELS_GET ============ |