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net: ena: Update LLQ header length in ena documentation

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LLQ entry length is 128 bytes. Therefore the maximum header in
the entry is calculated by:
tx_max_header_size =
LLQ_ENTRY_SIZE - DESCRIPTORS_NUM_BEFORE_HEADER * 16 =
128 - 2 * 16 = 96

This patch updates the documentation so that it states the correct
max header length.

Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Arthur Kiyanovski 2022-01-07 20:23:40 +00:00 committed by Jakub Kicinski
parent 394c48e08b
commit 273a2397fc
1 changed files with 1 additions and 1 deletions
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2
Documentation/networking/device_drivers/ethernet/amazon/ena.rst
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@ -135,7 +135,7 @@ The ENA driver supports two Queue Operation modes for Tx SQs:
- **Low Latency Queue (LLQ) mode or "push-mode":**
In this mode the driver pushes the transmit descriptors and the
first 128 bytes of the packet directly to the ENA device memory
first 96 bytes of the packet directly to the ENA device memory
space. The rest of the packet payload is fetched by the
device. For this operation mode, the driver uses a dedicated PCI
device memory BAR, which is mapped with write-combine capability.