diff options
| author | andre <andre@FreeBSD.org> | 2006-09-06 21:51:59 +0000 |
|---|---|---|
| committer | andre <andre@FreeBSD.org> | 2006-09-06 21:51:59 +0000 |
| commit | cb05913fd251edc3d35bcbeca73a8b681e2e58e8 (patch) | |
| tree | b5d4180eab9fff2a64a310b178d7e69374bbdacf /sys/netinet/tcp_reass.c | |
| parent | 0dddb6a1cc063906ce418aa1a75805e68b4ec971 (diff) | |
| download | FreeBSD-src-cb05913fd251edc3d35bcbeca73a8b681e2e58e8.zip FreeBSD-src-cb05913fd251edc3d35bcbeca73a8b681e2e58e8.tar.gz | |
First step of TSO (TCP segmentation offload) support in our network stack.
o add IFCAP_TSO[46] for drivers to announce this capability for IPv4 and IPv6
o add CSUM_TSO flag to mbuf pkthdr csum_flags field
o add tso_segsz field to mbuf pkthdr
o enhance ip_output() packet length check to allow for large TSO packets
o extend tcp_maxmtu[46]() with a flag pointer to pass interface capabilities
o adjust all callers of tcp_maxmtu[46]() accordingly
Discussed on: -current, -net
Sponsored by: TCP/IP Optimization Fundraise 2005
Diffstat (limited to 'sys/netinet/tcp_reass.c')
| -rw-r--r-- | sys/netinet/tcp_reass.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/sys/netinet/tcp_reass.c b/sys/netinet/tcp_reass.c index 86f9325..0699193 100644 --- a/sys/netinet/tcp_reass.c +++ b/sys/netinet/tcp_reass.c @@ -2857,6 +2857,7 @@ tcp_mss(tp, offer) struct socket *so; struct hc_metrics_lite metrics; int origoffer = offer; + int mtuflags = 0; #ifdef INET6 int isipv6 = ((inp->inp_vflag & INP_IPV6) != 0) ? 1 : 0; size_t min_protoh = isipv6 ? @@ -2869,12 +2870,12 @@ tcp_mss(tp, offer) /* initialize */ #ifdef INET6 if (isipv6) { - maxmtu = tcp_maxmtu6(&inp->inp_inc); + maxmtu = tcp_maxmtu6(&inp->inp_inc, &mtuflags); tp->t_maxopd = tp->t_maxseg = tcp_v6mssdflt; } else #endif { - maxmtu = tcp_maxmtu(&inp->inp_inc); + maxmtu = tcp_maxmtu(&inp->inp_inc, &mtuflags); tp->t_maxopd = tp->t_maxseg = tcp_mssdflt; } so = inp->inp_socket; @@ -3081,6 +3082,10 @@ tcp_mss(tp, offer) tp->snd_cwnd = mss * ss_fltsz_local; else tp->snd_cwnd = mss * ss_fltsz; + + /* Check the interface for TSO capabilities. */ + if (mtuflags & CSUM_TSO) + tp->t_flags |= TF_TSO; } /* @@ -3103,14 +3108,14 @@ tcp_mssopt(inc) #ifdef INET6 if (isipv6) { mss = tcp_v6mssdflt; - maxmtu = tcp_maxmtu6(inc); + maxmtu = tcp_maxmtu6(inc, NULL); thcmtu = tcp_hc_getmtu(inc); /* IPv4 and IPv6 */ min_protoh = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); } else #endif { mss = tcp_mssdflt; - maxmtu = tcp_maxmtu(inc); + maxmtu = tcp_maxmtu(inc, NULL); thcmtu = tcp_hc_getmtu(inc); /* IPv4 and IPv6 */ min_protoh = sizeof(struct tcpiphdr); } |
