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doc: clarify L4 Tx checksum prerequisite

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Based on PKT_TX_[TCP|UDP|SCTP]_CKSUM definition the user needs
to fill l2_len and l3_len mbuf fields before issuing HW Tx
checksum request.

Fixes: dad1ec72a3 ("doc: document NIC features")
Cc: stable@dpdk.org

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
This commit is contained in:
Jerin Jacob 2018-10-05 10:16:05 +05:30 committed by Ferruh Yigit
parent 9713e32914
commit 425f09300e
1 changed files with 1 additions and 0 deletions
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doc/guides/nics/features.rst
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@ -583,6 +583,7 @@ Supports L4 checksum offload.
* **[uses] mbuf**: ``mbuf.ol_flags:PKT_TX_IPV4`` | ``PKT_TX_IPV6``,
``mbuf.ol_flags:PKT_TX_L4_NO_CKSUM`` | ``PKT_TX_TCP_CKSUM`` |
``PKT_TX_SCTP_CKSUM`` | ``PKT_TX_UDP_CKSUM``.
* **[uses] mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``.
* **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_L4_CKSUM_UNKNOWN`` |
``PKT_RX_L4_CKSUM_BAD`` | ``PKT_RX_L4_CKSUM_GOOD`` |
``PKT_RX_L4_CKSUM_NONE``.