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Rename rt_flags to rte_flags && reduce number of rt_nhop accesses.

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No functional changes.

Most of the routing flags are stored in the netxtop instead of rtentry.
Rename rt->rt_flags to rt->rte_flags to simplify reading/modifying code
 checking routing flags.

In the new multipath code, rt->rt_nhop may actually point to nexthop group
 instead of nhop. To ease transition, reduce the amount of rt->rt_nhop->...
 accesses.

Differential Revision:	https://reviews.freebsd.org/D26156
This commit is contained in:
Alexander V. Chernikov 2020-08-22 19:30:56 +00:00
parent 46809e695f
commit 93bfd365d2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=364492
5 changed files with 43 additions and 36 deletions
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17
sys/net/route.c
View File

@ -243,7 +243,7 @@ rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway,
}
RT_LOCK(rc.rc_rt);
flags = rc.rc_rt->rt_flags;
flags = rc.rc_rt->rte_flags;
RT_UNLOCK(rc.rc_rt);
RTSTAT_INC(rts_dynamic);
@ -354,6 +354,7 @@ rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
struct nhop_object *nh;
int sa_len;
nh = rt->rt_nhop;
if (flags & NHR_COPY) {
/* Copy destination if dst is non-zero */
src = rt_key(rt);
@ -383,9 +384,10 @@ rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
}
/* Copy gateway is set && dst is non-zero */
src = &rt->rt_nhop->gw_sa;
src = &nh->gw_sa;
dst = info->rti_info[RTAX_GATEWAY];
if ((rt->rt_flags & RTF_GATEWAY) && src != NULL && dst != NULL){
if ((nhop_get_rtflags(nh) & RTF_GATEWAY) &&
src != NULL && dst != NULL) {
if (src->sa_len > dst->sa_len)
return (ENOMEM);
memcpy(dst, src, src->sa_len);
@ -398,20 +400,19 @@ rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
info->rti_info[RTAX_NETMASK] = rt_mask(rt);
info->rti_addrs |= RTA_NETMASK;
}
if (rt->rt_flags & RTF_GATEWAY) {
info->rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
if (nhop_get_rtflags(nh) & RTF_GATEWAY) {
info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
info->rti_addrs |= RTA_GATEWAY;
}
}
nh = rt->rt_nhop;
rmx = info->rti_rmx;
if (rmx != NULL) {
info->rti_mflags |= RTV_MTU;
rmx->rmx_mtu = nh->nh_mtu;
}
info->rti_flags = rt->rt_flags | nhop_get_rtflags(nh);
info->rti_flags = rt->rte_flags | nhop_get_rtflags(nh);
info->rti_ifp = nh->nh_ifp;
info->rti_ifa = nh->nh_ifa;
if (flags & NHR_REF) {
@ -579,7 +580,7 @@ rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
* Protect (sorta) against walktree recursion problems
* with cloned routes
*/
if ((rt->rt_flags & RTF_UP) == 0)
if ((rt->rte_flags & RTF_UP) == 0)
return (0);
return (1);

13
sys/net/route/route_ctl.c
View File

@ -251,7 +251,7 @@ add_route(struct rib_head *rnh, struct rt_addrinfo *info,
return (ENOBUFS);
}
RT_LOCK_INIT(rt);
rt->rt_flags = RTF_UP | flags;
rt->rte_flags = RTF_UP | flags;
rt->rt_nhop = nh;
/* Fill in dst */
@ -406,6 +406,7 @@ rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
{
struct sockaddr *dst, *netmask;
struct rtentry *rt;
struct nhop_object *nh;
struct radix_node *rn;
dst = info->rti_info[RTAX_DST];
@ -417,16 +418,18 @@ rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
return (NULL);
}
nh = rt->rt_nhop;
if ((info->rti_flags & RTF_PINNED) == 0) {
/* Check if target route can be deleted */
if (rt->rt_flags & RTF_PINNED) {
if (NH_IS_PINNED(nh)) {
*perror = EADDRINUSE;
return (NULL);
}
}
if (info->rti_filter != NULL) {
if (info->rti_filter(rt, rt->rt_nhop, info->rti_filterdata)==0){
if (info->rti_filter(rt, nh, info->rti_filterdata)==0){
/* Not matched */
*perror = ENOENT;
return (NULL);
@ -437,7 +440,7 @@ rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
* Ease the caller work by filling in remaining info
* from that particular entry.
*/
info->rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
}
/*
@ -459,7 +462,7 @@ rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
rt = RNTORT(rn);
RT_LOCK(rt);
rt->rt_flags &= ~RTF_UP;
rt->rte_flags &= ~RTF_UP;
*perror = 0;

7
sys/net/route/route_ddb.c
View File

@ -148,18 +148,17 @@ rt_dumpentry_ddb(struct radix_node *rn, void *arg __unused)
}
db_printf("flags ");
flags = rt->rt_flags;
flags = rt->rte_flags | nhop_get_rtflags(nh);
if (flags == 0)
db_printf("none");
while ((idx = ffs(flags)) > 0) {
idx--;
if (flags != rt->rt_flags)
db_printf(",");
db_printf("%s", rt_flag_name(idx));
flags &= ~(1ul << idx);
if (flags != 0)
db_printf(",");
}
db_printf("\n");

2
sys/net/route/route_var.h
View File

@ -165,7 +165,7 @@ struct rtentry {
char rt_dstb[28];
};
int rt_flags; /* up/down?, host/net */
int rte_flags; /* up/down?, host/net */
u_long rt_weight; /* absolute weight */
u_long rt_expire; /* lifetime for route, e.g. redirect */
#define rt_endzero rt_mtx

40
sys/net/rtsock.c
View File

@ -179,7 +179,8 @@ static int sysctl_dumpentry(struct radix_node *rn, void *vw);
static int sysctl_iflist(int af, struct walkarg *w);
static int sysctl_ifmalist(int af, struct walkarg *w);
static int route_output(struct mbuf *m, struct socket *so, ...);
static void rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
static void rt_getmetrics(const struct rtentry *rt,
const struct nhop_object *nh, struct rt_metrics *out);
static void rt_dispatch(struct mbuf *, sa_family_t);
static int handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
struct rt_msghdr *rtm, struct rib_cmd_info *rc);
@ -814,12 +815,12 @@ update_rtm_from_rte(struct rt_addrinfo *info, struct rt_msghdr **prtm,
w.w_tmemsize = alloc_len;
rtsock_msg_buffer(rtm->rtm_type, info, &w, &len);
if (rt->rt_flags & RTF_GWFLAG_COMPAT)
if (rt->rte_flags & RTF_GWFLAG_COMPAT)
rtm->rtm_flags = RTF_GATEWAY |
(rt->rt_flags & ~RTF_GWFLAG_COMPAT);
(rt->rte_flags & ~RTF_GWFLAG_COMPAT);
else
rtm->rtm_flags = rt->rt_flags;
rt_getmetrics(rt, &rtm->rtm_rmx);
rtm->rtm_flags = rt->rte_flags;
rt_getmetrics(rt, nh, &rtm->rtm_rmx);
rtm->rtm_addrs = info->rti_addrs;
if (orig_rtm != NULL)
@ -1055,13 +1056,14 @@ send_rtm_reply(struct socket *so, struct rt_msghdr *rtm, struct mbuf *m,
static void
rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
rt_getmetrics(const struct rtentry *rt, const struct nhop_object *nh,
struct rt_metrics *out)
{
bzero(out, sizeof(*out));
out->rmx_mtu = rt->rt_nhop->nh_mtu;
out->rmx_mtu = nh->nh_mtu;
out->rmx_weight = rt->rt_weight;
out->rmx_nhidx = nhop_get_idx(rt->rt_nhop);
out->rmx_nhidx = nhop_get_idx(nh);
/* Kernel -> userland timebase conversion. */
out->rmx_expire = rt->rt_expire ?
rt->rt_expire - time_uptime + time_second : 0;
@ -1472,15 +1474,17 @@ rtsock_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs,
{
struct sockaddr_storage ss;
struct rt_addrinfo info;
struct nhop_object *nh;
if (V_route_cb.any_count == 0)
return (0);
nh = rt->rt_nhop;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt), rt_mask(rt), &ss);
info.rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
info.rti_flags = rt->rt_flags;
info.rti_info[RTAX_GATEWAY] = &nh->gw_sa;
info.rti_flags = rt->rte_flags | nhop_get_rtflags(nh);
info.rti_ifp = ifp;
return (rtsock_routemsg_info(cmd, &info, fibnum));
@ -1681,7 +1685,7 @@ static int
can_export_rte(struct ucred *td_ucred, const struct rtentry *rt)
{
if ((rt->rt_flags & RTF_HOST) == 0
if ((rt->rte_flags & RTF_HOST) == 0
? jailed_without_vnet(td_ucred)
: prison_if(td_ucred, rt_key_const(rt)) != 0)
return (0);
@ -1703,17 +1707,17 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
NET_EPOCH_ASSERT();
if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
if (w->w_op == NET_RT_FLAGS && !(rt->rte_flags & w->w_arg))
return 0;
if (!can_export_rte(w->w_req->td->td_ucred, rt))
return (0);
nh = rt->rt_nhop;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
info.rti_info[RTAX_GATEWAY] = &nh->gw_sa;
info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
rt_mask(rt), &ss);
info.rti_info[RTAX_GENMASK] = 0;
nh = rt->rt_nhop;
if (nh->nh_ifp && !(nh->nh_ifp->if_flags & IFF_DYING)) {
info.rti_info[RTAX_IFP] = nh->nh_ifp->if_addr->ifa_addr;
info.rti_info[RTAX_IFA] = nh->nh_ifa->ifa_addr;
@ -1727,13 +1731,13 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
bzero(&rtm->rtm_index,
sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
if (rt->rt_flags & RTF_GWFLAG_COMPAT)
if (rt->rte_flags & RTF_GWFLAG_COMPAT)
rtm->rtm_flags = RTF_GATEWAY |
(rt->rt_flags & ~RTF_GWFLAG_COMPAT);
(rt->rte_flags & ~RTF_GWFLAG_COMPAT);
else
rtm->rtm_flags = rt->rt_flags;
rtm->rtm_flags = rt->rte_flags;
rtm->rtm_flags |= nhop_get_rtflags(nh);
rt_getmetrics(rt, &rtm->rtm_rmx);
rt_getmetrics(rt, nh, &rtm->rtm_rmx);
rtm->rtm_index = nh->nh_ifp->if_index;
rtm->rtm_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);