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ip link: Add support for remote checksum offload to IP tunnels

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This patch adds support to remote checksum checksum offload
confinguration for IPIP, SIT, and GRE tunnels. This patch
adds a [no]encap-remcsum to ip link command which applicable
when configured tunnels that use GUE.

http://tools.ietf.org/html/draft-herbert-remotecsumoffload-00

Example:

ip link add name tun1 type gre remote 192.168.1.1 local 192.168.1.2 \
   ttl 225 encap fou encap-sport auto encap-dport 7777 encap-csum \
   encap-remcsum

This would create an GRE tunnel in GUE encapsulation where the source
port is automatically selected (based on hash of inner packet),
checksums in the encapsulating UDP header are enabled (needed.for
remote checksum offload), and remote checksum ffload is configured to
be used on the tunnel (affects TX side).

Signed-off-by: Tom Herbert <therbert@google.com>
This commit is contained in:
Tom Herbert 2015-01-29 08:51:58 -08:00 committed by Stephen Hemminger
parent 82a307e835
commit 858dbb208e
2 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
ip/link_gre.c
View File

@ -31,7 +31,7 @@ static void print_usage(FILE *f)
fprintf(f, " [ ttl TTL ] [ tos TOS ] [ [no]pmtudisc ] [ dev PHYS_DEV ]\n");
fprintf(f, " [ noencap ] [ encap { fou | gue | none } ]\n");
fprintf(f, " [ encap-sport PORT ] [ encap-dport PORT ]\n");
fprintf(f, " [ [no]encap-csum ] [ [no]encap-csum6 ]\n");
fprintf(f, " [ [no]encap-csum ] [ [no]encap-csum6 ] [ [no]encap-remcsum ]\n");
fprintf(f, "\n");
fprintf(f, "Where: NAME := STRING\n");
fprintf(f, " ADDR := { IP_ADDRESS | any }\n");
@ -287,6 +287,10 @@ get_failed:
encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
encapflags |= ~TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "encap-remcsum") == 0) {
encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
} else if (strcmp(*argv, "noencap-remcsum") == 0) {
encapflags |= ~TUNNEL_ENCAP_FLAG_REMCSUM;
} else
usage();
argc--; argv++;
@ -445,6 +449,11 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
fputs("encap-csum6 ", f);
else
fputs("noencap-csum6 ", f);
if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
fputs("encap-remcsum ", f);
else
fputs("noencap-remcsum ", f);
}
}

11
ip/link_iptnl.c
View File

@ -31,7 +31,7 @@ static void print_usage(FILE *f, int sit)
fprintf(f, " [ 6rd-prefix ADDR ] [ 6rd-relay_prefix ADDR ] [ 6rd-reset ]\n");
fprintf(f, " [ noencap ] [ encap { fou | gue | none } ]\n");
fprintf(f, " [ encap-sport PORT ] [ encap-dport PORT ]\n");
fprintf(f, " [ [no]encap-csum ] [ [no]encap-csum6 ]\n");
fprintf(f, " [ [no]encap-csum ] [ [no]encap-csum6 ] [ [no]encap-remcsum ]\n");
if (sit) {
fprintf(f, " [ mode { ip6ip | ipip | any } ]\n");
fprintf(f, " [ isatap ]\n");
@ -256,6 +256,10 @@ get_failed:
encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
} else if (strcmp(*argv, "encap-remcsum") == 0) {
encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
} else if (strcmp(*argv, "noencap-remcsum") == 0) {
encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
} else if (strcmp(*argv, "6rd-prefix") == 0) {
inet_prefix prefix;
NEXT_ARG();
@ -438,6 +442,11 @@ static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[
fputs("encap-csum6 ", f);
else
fputs("noencap-csum6 ", f);
if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
fputs("encap-remcsum ", f);
else
fputs("noencap-remcsum ", f);
}
}