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In order for the TCP Handshake to support ECN++, and further ECN-related

Browse source 
improvements, the ECN bits need to be exposed to the TCP SYNcache.
This change is a minimal modification to the function headers, without any
functional change intended.

Submitted by:		Richard Scheffenegger
Reviewed by:		rgrimes@, rrs@, tuexen@
Differential Revision:	https://reviews.freebsd.org/D22436
This commit is contained in:
Michael Tuexen 2019-12-01 18:05:02 +00:00
parent 669a285ffb
commit fa49a96419
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=355266
6 changed files with 27 additions and 10 deletions
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25
sys/dev/cxgbe/tom/t4_listen.c
View file

@ -988,7 +988,7 @@ t4opt_to_tcpopt(const struct tcp_options *t4opt, struct tcpopt *to)
static void
pass_accept_req_to_protohdrs(struct adapter *sc, const struct mbuf *m,
struct in_conninfo *inc, struct tcphdr *th)
struct in_conninfo *inc, struct tcphdr *th, uint8_t *iptos)
{
const struct cpl_pass_accept_req *cpl = mtod(m, const void *);
const struct ether_header *eh;
@ -1005,6 +1005,21 @@ pass_accept_req_to_protohdrs(struct adapter *sc, const struct mbuf *m,
tcp = (const void *)(l3hdr + G_IP_HDR_LEN(hlen));
}
/* extract TOS (DiffServ + ECN) byte for AccECN */
if (iptos) {
if (((struct ip *)l3hdr)->ip_v == IPVERSION) {
const struct ip *ip = (const void *)l3hdr;
*iptos = ip->ip_tos;
}
#ifdef INET6
else
if (((struct ip *)l3hdr)->ip_v == (IPV6_VERSION >> 4)) {
const struct ip6_hdr *ip6 = (const void *)l3hdr;
*iptos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
}
#endif /* INET */
}
if (inc) {
bzero(inc, sizeof(*inc));
inc->inc_fport = tcp->th_sport;
@ -1150,6 +1165,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
unsigned int opcode = G_CPL_OPCODE(be32toh(OPCODE_TID(cpl)));
#endif
struct offload_settings settings;
uint8_t iptos;
KASSERT(opcode == CPL_PASS_ACCEPT_REQ,
("%s: unexpected opcode 0x%x", __func__, opcode));
@ -1208,7 +1224,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
if (lctx->vnet != ifp->if_vnet)
REJECT_PASS_ACCEPT_REQ(true);
pass_accept_req_to_protohdrs(sc, m, &inc, &th);
pass_accept_req_to_protohdrs(sc, m, &inc, &th, &iptos);
if (inc.inc_flags & INC_ISIPV6) {
/* Don't offload if the ifcap isn't enabled */
@ -1284,7 +1300,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
* syncache_add. Note that syncache_add releases the pcb lock.
*/
t4opt_to_tcpopt(&cpl->tcpopt, &to);
toe_syncache_add(&inc, &to, &th, inp, tod, synqe);
toe_syncache_add(&inc, &to, &th, inp, tod, synqe, iptos);
if (atomic_load_int(&synqe->ok_to_respond) > 0) {
uint64_t opt0;
@ -1350,9 +1366,10 @@ synqe_to_protohdrs(struct adapter *sc, struct synq_entry *synqe,
struct tcphdr *th, struct tcpopt *to)
{
uint16_t tcp_opt = be16toh(cpl->tcp_opt);
uint8_t iptos;
/* start off with the original SYN */
pass_accept_req_to_protohdrs(sc, synqe->syn, inc, th);
pass_accept_req_to_protohdrs(sc, synqe->syn, inc, th, &iptos);
/* modify parts to make it look like the ACK to our SYN|ACK */
th->th_flags = TH_ACK;

2
sys/netinet/tcp_input.c
View file

@ -1282,7 +1282,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto)
#endif
TCP_PROBE3(debug__input, tp, th, m);
tcp_dooptions(&to, optp, optlen, TO_SYN);
if (syncache_add(&inc, &to, th, inp, &so, m, NULL, NULL))
if (syncache_add(&inc, &to, th, inp, &so, m, NULL, NULL, iptos))
goto tfo_socket_result;
/*

2
sys/netinet/tcp_syncache.c
View file

@ -1369,7 +1369,7 @@ syncache_tfo_expand(struct syncache *sc, struct socket **lsop, struct mbuf *m,
int
syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
struct inpcb *inp, struct socket **lsop, struct mbuf *m, void *tod,
void *todctx)
void *todctx, uint8_t iptos)
{
struct tcpcb *tp;
struct socket *so;

2
sys/netinet/tcp_syncache.h
View file

@ -45,7 +45,7 @@ int syncache_expand(struct in_conninfo *, struct tcpopt *,
struct tcphdr *, struct socket **, struct mbuf *);
int syncache_add(struct in_conninfo *, struct tcpopt *,
struct tcphdr *, struct inpcb *, struct socket **, struct mbuf *,
void *, void *);
void *, void *, uint8_t);
void syncache_chkrst(struct in_conninfo *, struct tcphdr *, struct mbuf *);
void syncache_badack(struct in_conninfo *);
int syncache_pcblist(struct sysctl_req *);

4
sys/netinet/toecore.c
View file

@ -346,13 +346,13 @@ unregister_toedev(struct toedev *tod)
void
toe_syncache_add(struct in_conninfo *inc, struct tcpopt *to, struct tcphdr *th,
struct inpcb *inp, void *tod, void *todctx)
struct inpcb *inp, void *tod, void *todctx, uint8_t iptos)
{
struct socket *lso = inp->inp_socket;
INP_WLOCK_ASSERT(inp);
syncache_add(inc, to, th, inp, &lso, NULL, tod, todctx);
syncache_add(inc, to, th, inp, &lso, NULL, tod, todctx, iptos);
}
int

2
sys/netinet/toecore.h
View file

@ -135,7 +135,7 @@ int toe_l2_resolve(struct toedev *, struct ifnet *, struct sockaddr *,
void toe_connect_failed(struct toedev *, struct inpcb *, int);
void toe_syncache_add(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
struct inpcb *, void *, void *);
struct inpcb *, void *, void *, uint8_t);
int toe_syncache_expand(struct in_conninfo *, struct tcpopt *, struct tcphdr *,
struct socket **);