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mbuf checksum flags and fields to support tunneling protocols.

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These are being added to support VXLAN but will work for GENEVE as well.
ENCAP_RSVD1 will likely become ENCAP_GENEVE in the future.

The size of struct mbuf does not change and that means this change can be MFC'd.
If size wasn't a constraint a cleaner way may have been to add inner_csum_flags
and inner_csum_data to go with csum_flags and csum_data.

Reviewed by:	kib@
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D25873
This commit is contained in:
Navdeep Parhar 2020-09-18 01:38:47 +00:00
parent 294c24b194
commit 1f7313861b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=365867
1 changed files with 47 additions and 7 deletions
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54
sys/sys/mbuf.h
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@ -171,7 +171,10 @@ struct pkthdr {
uint8_t l3hlen; /* layer 3 hdr len */
uint8_t l4hlen; /* layer 4 hdr len */
uint8_t l5hlen; /* layer 5 hdr len */
uint32_t spare;
uint8_t inner_l2hlen;
uint8_t inner_l3hlen;
uint8_t inner_l4hlen;
uint8_t inner_l5hlen;
};
};
union {
@ -616,7 +619,13 @@ m_epg_pagelen(const struct mbuf *m, int pidx, int pgoff)
* Outbound flags that are set by upper protocol layers requesting lower
* layers, or ideally the hardware, to perform these offloading tasks.
* For outbound packets this field and its flags can be directly tested
* against ifnet if_hwassist.
* against ifnet if_hwassist. Note that the outbound and the inbound flags do
* not collide right now but they could be allowed to (as long as the flags are
* scrubbed appropriately when the direction of an mbuf changes). CSUM_BITS
* would also have to split into CSUM_BITS_TX and CSUM_BITS_RX.
*
* CSUM_INNER_<x> is the same as CSUM_<x> but it applies to the inner frame.
* The CSUM_ENCAP_<x> bits identify the outer encapsulation.
*/
#define CSUM_IP 0x00000001 /* IP header checksum offload */
#define CSUM_IP_UDP 0x00000002 /* UDP checksum offload */
@ -625,13 +634,28 @@ m_epg_pagelen(const struct mbuf *m, int pidx, int pgoff)
#define CSUM_IP_TSO 0x00000010 /* TCP segmentation offload */
#define CSUM_IP_ISCSI 0x00000020 /* iSCSI checksum offload */
#define CSUM_INNER_IP6_UDP 0x00000040
#define CSUM_INNER_IP6_TCP 0x00000080
#define CSUM_INNER_IP6_TSO 0x00000100
#define CSUM_IP6_UDP 0x00000200 /* UDP checksum offload */
#define CSUM_IP6_TCP 0x00000400 /* TCP checksum offload */
#define CSUM_IP6_SCTP 0x00000800 /* SCTP checksum offload */
#define CSUM_IP6_TSO 0x00001000 /* TCP segmentation offload */
#define CSUM_IP6_ISCSI 0x00002000 /* iSCSI checksum offload */
#define CSUM_INNER_IP 0x00004000
#define CSUM_INNER_IP_UDP 0x00008000
#define CSUM_INNER_IP_TCP 0x00010000
#define CSUM_INNER_IP_TSO 0x00020000
#define CSUM_ENCAP_VXLAN 0x00040000 /* VXLAN outer encapsulation */
#define CSUM_ENCAP_RSVD1 0x00080000
/* Inbound checksum support where the checksum was verified by hardware. */
#define CSUM_INNER_L3_CALC 0x00100000
#define CSUM_INNER_L3_VALID 0x00200000
#define CSUM_INNER_L4_CALC 0x00400000
#define CSUM_INNER_L4_VALID 0x00800000
#define CSUM_L3_CALC 0x01000000 /* calculated layer 3 csum */
#define CSUM_L3_VALID 0x02000000 /* checksum is correct */
#define CSUM_L4_CALC 0x04000000 /* calculated layer 4 csum */
@ -642,16 +666,31 @@ m_epg_pagelen(const struct mbuf *m, int pidx, int pgoff)
#define CSUM_SND_TAG 0x80000000 /* Packet header has send tag */
#define CSUM_FLAGS_TX (CSUM_IP | CSUM_IP_UDP | CSUM_IP_TCP | CSUM_IP_SCTP | \
CSUM_IP_TSO | CSUM_IP_ISCSI | CSUM_INNER_IP6_UDP | CSUM_INNER_IP6_TCP | \
CSUM_INNER_IP6_TSO | CSUM_IP6_UDP | CSUM_IP6_TCP | CSUM_IP6_SCTP | \
CSUM_IP6_TSO | CSUM_IP6_ISCSI | CSUM_INNER_IP | CSUM_INNER_IP_UDP | \
CSUM_INNER_IP_TCP | CSUM_INNER_IP_TSO | CSUM_ENCAP_VXLAN | \
CSUM_ENCAP_RSVD1 | CSUM_SND_TAG)
#define CSUM_FLAGS_RX (CSUM_INNER_L3_CALC | CSUM_INNER_L3_VALID | \
CSUM_INNER_L4_CALC | CSUM_INNER_L4_VALID | CSUM_L3_CALC | CSUM_L3_VALID | \
CSUM_L4_CALC | CSUM_L4_VALID | CSUM_L5_CALC | CSUM_L5_VALID | \
CSUM_COALESCED)
/*
* CSUM flag description for use with printf(9) %b identifier.
*/
#define CSUM_BITS \
"\20\1CSUM_IP\2CSUM_IP_UDP\3CSUM_IP_TCP\4CSUM_IP_SCTP\5CSUM_IP_TSO" \
"\6CSUM_IP_ISCSI" \
"\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP\15CSUM_IP6_TSO" \
"\16CSUM_IP6_ISCSI" \
"\31CSUM_L3_CALC\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID" \
"\35CSUM_L5_CALC\36CSUM_L5_VALID\37CSUM_COALESCED\40CSUM_SND_TAG"
"\6CSUM_IP_ISCSI\7CSUM_INNER_IP6_UDP\10CSUM_INNER_IP6_TCP" \
"\11CSUM_INNER_IP6_TSO\12CSUM_IP6_UDP\13CSUM_IP6_TCP\14CSUM_IP6_SCTP" \
"\15CSUM_IP6_TSO\16CSUM_IP6_ISCSI\17CSUM_INNER_IP\20CSUM_INNER_IP_UDP" \
"\21CSUM_INNER_IP_TCP\22CSUM_INNER_IP_TSO\23CSUM_ENCAP_VXLAN" \
"\24CSUM_ENCAP_RSVD1\25CSUM_INNER_L3_CALC\26CSUM_INNER_L3_VALID" \
"\27CSUM_INNER_L4_CALC\30CSUM_INNER_L4_VALID\31CSUM_L3_CALC" \
"\32CSUM_L3_VALID\33CSUM_L4_CALC\34CSUM_L4_VALID\35CSUM_L5_CALC" \
"\36CSUM_L5_VALID\37CSUM_COALESCED\40CSUM_SND_TAG"
/* CSUM flags compatibility mappings. */
#define CSUM_IP_CHECKED CSUM_L3_CALC
@ -667,6 +706,7 @@ m_epg_pagelen(const struct mbuf *m, int pidx, int pgoff)
#define CSUM_UDP CSUM_IP_UDP
#define CSUM_SCTP CSUM_IP_SCTP
#define CSUM_TSO (CSUM_IP_TSO|CSUM_IP6_TSO)
#define CSUM_INNER_TSO (CSUM_INNER_IP_TSO|CSUM_INNER_IP6_TSO)
#define CSUM_UDP_IPV6 CSUM_IP6_UDP
#define CSUM_TCP_IPV6 CSUM_IP6_TCP
#define CSUM_SCTP_IPV6 CSUM_IP6_SCTP