netns xfrm: per-netns xfrm_policy_byidx hashmask

Per-netns hashes are independently resizeable.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 8 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 700cdd7564e4..9e37a44f148e 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -329,12 +329,11 @@ struct xfrm_policy_hash {
 
 static struct hlist_head xfrm_policy_inexact[XFRM_POLICY_MAX*2];
 static struct xfrm_policy_hash xfrm_policy_bydst[XFRM_POLICY_MAX*2] __read_mostly;
-static unsigned int xfrm_idx_hmask __read_mostly;
 static unsigned int xfrm_policy_hashmax __read_mostly = 1 * 1024 * 1024;
 
 static inline unsigned int idx_hash(u32 index)
 {
-        return __idx_hash(index, xfrm_idx_hmask);
+        return __idx_hash(index, init_net.xfrm.policy_idx_hmask);
 }
 
 static struct hlist_head *policy_hash_bysel(struct xfrm_selector *sel, unsigned short family, int dir)
@@ -434,7 +433,7 @@ static void xfrm_bydst_resize(int dir)
 
 static void xfrm_byidx_resize(int total)
 {
-        unsigned int hmask = xfrm_idx_hmask;
+        unsigned int hmask = init_net.xfrm.policy_idx_hmask;
         unsigned int nhashmask = xfrm_new_hash_mask(hmask);
         unsigned int nsize = (nhashmask + 1) * sizeof(struct hlist_head);
         struct hlist_head *oidx = init_net.xfrm.policy_byidx;
@@ -450,7 +449,7 @@ static void xfrm_byidx_resize(int total)
                 xfrm_idx_hash_transfer(oidx + i, nidx, nhashmask);
 
         init_net.xfrm.policy_byidx = nidx;
-        xfrm_idx_hmask = nhashmask;
+        init_net.xfrm.policy_idx_hmask = nhashmask;
 
         write_unlock_bh(&xfrm_policy_lock);
 
@@ -474,7 +473,7 @@ static inline int xfrm_bydst_should_resize(int dir, int *total)
 
 static inline int xfrm_byidx_should_resize(int total)
 {
-        unsigned int hmask = xfrm_idx_hmask;
+        unsigned int hmask = init_net.xfrm.policy_idx_hmask;
 
         if ((hmask + 1) < xfrm_policy_hashmax &&
             total > hmask)
@@ -492,7 +491,7 @@ void xfrm_spd_getinfo(struct xfrmk_spdinfo *si)
         si->inscnt = xfrm_policy_count[XFRM_POLICY_IN+XFRM_POLICY_MAX];
         si->outscnt = xfrm_policy_count[XFRM_POLICY_OUT+XFRM_POLICY_MAX];
         si->fwdscnt = xfrm_policy_count[XFRM_POLICY_FWD+XFRM_POLICY_MAX];
-        si->spdhcnt = xfrm_idx_hmask;
+        si->spdhcnt = init_net.xfrm.policy_idx_hmask;
         si->spdhmcnt = xfrm_policy_hashmax;
         read_unlock_bh(&xfrm_policy_lock);
 }
@@ -2410,7 +2409,7 @@ static int __net_init xfrm_policy_init(struct net *net)
         net->xfrm.policy_byidx = xfrm_hash_alloc(sz);
         if (!net->xfrm.policy_byidx)
                 goto out_byidx;
-        xfrm_idx_hmask = hmask;
+        net->xfrm.policy_idx_hmask = hmask;
 
         for (dir = 0; dir < XFRM_POLICY_MAX * 2; dir++) {
                 struct xfrm_policy_hash *htab;
@@ -2439,7 +2438,7 @@ static void xfrm_policy_fini(struct net *net)
 
         WARN_ON(!list_empty(&net->xfrm.policy_all));
 
-        sz = (xfrm_idx_hmask + 1) * sizeof(struct hlist_head);
+        sz = (net->xfrm.policy_idx_hmask + 1) * sizeof(struct hlist_head);
         WARN_ON(!hlist_empty(net->xfrm.policy_byidx));
         xfrm_hash_free(net->xfrm.policy_byidx, sz);
 }