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doc: clarify L3 Tx checksum prerequisite

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Based on PKT_TX_IP_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 10:16:04 +05:30 committed by Ferruh Yigit
parent 5b4557ec8d
commit 9713e32914
1 changed files with 1 additions and 0 deletions
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doc/guides/nics/features.rst
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@ -563,6 +563,7 @@ Supports L3 checksum offload.
* **[uses] rte_eth_txconf,rte_eth_txmode**: ``offloads:DEV_TX_OFFLOAD_IPV4_CKSUM``.
* **[uses] mbuf**: ``mbuf.ol_flags:PKT_TX_IP_CKSUM``,
``mbuf.ol_flags:PKT_TX_IPV4`` | ``PKT_TX_IPV6``.
* **[uses] mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``.
* **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_IP_CKSUM_UNKNOWN`` |
``PKT_RX_IP_CKSUM_BAD`` | ``PKT_RX_IP_CKSUM_GOOD`` |
``PKT_RX_IP_CKSUM_NONE``.