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mbuf: add help about Tx checksum flags

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Describe how to use hardware checksum API.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
This commit is contained in:
Olivier Matz 2014-11-26 16:04:46 +01:00 committed by Thomas Monjalon
parent 340e52d9bd
commit b029fd236d
1 changed files with 16 additions and 8 deletions
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24
lib/librte_mbuf/rte_mbuf.h
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@ -100,12 +100,16 @@ extern "C" {
/* add new TX flags here */
#define PKT_TX_VXLAN_CKSUM (1ULL << 50) /**< TX checksum of VXLAN computed by NIC */
#define PKT_TX_IEEE1588_TMST (1ULL << 51) /**< TX IEEE1588 packet to timestamp. */
/*
* Bits 52+53 used for L4 packet type with checksum enabled.
* 00: Reserved
* 01: TCP checksum
* 10: SCTP checksum
* 11: UDP checksum
/**
* Bits 52+53 used for L4 packet type with checksum enabled: 00: Reserved,
* 01: TCP checksum, 10: SCTP checksum, 11: UDP checksum. To use hardware
* L4 checksum offload, the user needs to:
* - fill l2_len and l3_len in mbuf
* - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or PKT_TX_UDP_CKSUM
* - set the flag PKT_TX_IPV4 or PKT_TX_IPV6
* - calculate the pseudo header checksum and set it in the L4 header (only
* for TCP or UDP). For SCTP, set the crc field to 0.
*/
#define PKT_TX_L4_NO_CKSUM (0ULL << 52) /**< Disable L4 cksum of TX pkt. */
#define PKT_TX_TCP_CKSUM (1ULL << 52) /**< TCP cksum of TX pkt. computed by NIC. */
@ -115,8 +119,12 @@ extern "C" {
#define PKT_TX_IP_CKSUM (1ULL << 54) /**< IP cksum of TX pkt. computed by NIC. */
#define PKT_TX_IPV4_CSUM PKT_TX_IP_CKSUM /**< Alias of PKT_TX_IP_CKSUM. */
#define PKT_TX_IPV4 PKT_RX_IPV4_HDR /**< IPv4 with no IP checksum offload. */
#define PKT_TX_IPV6 PKT_RX_IPV6_HDR /**< IPv6 packet */
/** Tell the NIC it's an IPv4 packet. Required for L4 checksum offload. */
#define PKT_TX_IPV4 PKT_RX_IPV4_HDR
/** Tell the NIC it's an IPv6 packet. Required for L4 checksum offload. */
#define PKT_TX_IPV6 PKT_RX_IPV6_HDR
#define PKT_TX_VLAN_PKT (1ULL << 55) /**< TX packet is a 802.1q VLAN packet. */