netns xfrm: per-netns xfrm_state_hmask

Since hashtables are per-netns, they can be independently resized.

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

1 files changed, 15 insertions, 16 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 66ca1ef7f8e..de08ed9a477 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -44,7 +44,6 @@ u32 sysctl_xfrm_acq_expires __read_mostly = 30;
 
 static DEFINE_SPINLOCK(xfrm_state_lock);
 
-static unsigned int xfrm_state_hmask __read_mostly;
 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
 static unsigned int xfrm_state_num;
 static unsigned int xfrm_state_genid;
@@ -64,20 +63,20 @@ static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
                                          u32 reqid,
                                          unsigned short family)
 {
-        return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask);
+        return __xfrm_dst_hash(daddr, saddr, reqid, family, init_net.xfrm.state_hmask);
 }
 
 static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr,
                                          xfrm_address_t *saddr,
                                          unsigned short family)
 {
-        return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask);
+        return __xfrm_src_hash(daddr, saddr, family, init_net.xfrm.state_hmask);
 }
 
 static inline unsigned int
 xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
 {
-        return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask);
+        return __xfrm_spi_hash(daddr, spi, proto, family, init_net.xfrm.state_hmask);
 }
 
 static void xfrm_hash_transfer(struct hlist_head *list,
@@ -113,7 +112,7 @@ static void xfrm_hash_transfer(struct hlist_head *list,
 
 static unsigned long xfrm_hash_new_size(void)
 {
-        return ((xfrm_state_hmask + 1) << 1) *
+        return ((init_net.xfrm.state_hmask + 1) << 1) *
                 sizeof(struct hlist_head);
 }
 
@@ -147,19 +146,19 @@ static void xfrm_hash_resize(struct work_struct *__unused)
         spin_lock_bh(&xfrm_state_lock);
 
         nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
-        for (i = xfrm_state_hmask; i >= 0; i--)
+        for (i = init_net.xfrm.state_hmask; i >= 0; i--)
                 xfrm_hash_transfer(init_net.xfrm.state_bydst+i, ndst, nsrc, nspi,
                                    nhashmask);
 
         odst = init_net.xfrm.state_bydst;
         osrc = init_net.xfrm.state_bysrc;
         ospi = init_net.xfrm.state_byspi;
-        ohashmask = xfrm_state_hmask;
+        ohashmask = init_net.xfrm.state_hmask;
 
         init_net.xfrm.state_bydst = ndst;
         init_net.xfrm.state_bysrc = nsrc;
         init_net.xfrm.state_byspi = nspi;
-        xfrm_state_hmask = nhashmask;
+        init_net.xfrm.state_hmask = nhashmask;
 
         spin_unlock_bh(&xfrm_state_lock);
 
@@ -582,7 +581,7 @@ xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info)
 {
         int i, err = 0;
 
-        for (i = 0; i <= xfrm_state_hmask; i++) {
+        for (i = 0; i <= init_net.xfrm.state_hmask; i++) {
                 struct hlist_node *entry;
                 struct xfrm_state *x;
 
@@ -617,7 +616,7 @@ int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info)
         if (err)
                 goto out;
 
-        for (i = 0; i <= xfrm_state_hmask; i++) {
+        for (i = 0; i <= init_net.xfrm.state_hmask; i++) {
                 struct hlist_node *entry;
                 struct xfrm_state *x;
 restart:
@@ -652,7 +651,7 @@ void xfrm_sad_getinfo(struct xfrmk_sadinfo *si)
 {
         spin_lock_bh(&xfrm_state_lock);
         si->sadcnt = xfrm_state_num;
-        si->sadhcnt = xfrm_state_hmask;
+        si->sadhcnt = init_net.xfrm.state_hmask;
         si->sadhmcnt = xfrm_state_hashmax;
         spin_unlock_bh(&xfrm_state_lock);
 }
@@ -754,8 +753,8 @@ __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
 static void xfrm_hash_grow_check(int have_hash_collision)
 {
         if (have_hash_collision &&
-            (xfrm_state_hmask + 1) < xfrm_state_hashmax &&
-            xfrm_state_num > xfrm_state_hmask)
+            (init_net.xfrm.state_hmask + 1) < xfrm_state_hashmax &&
+            xfrm_state_num > init_net.xfrm.state_hmask)
                 schedule_work(&xfrm_hash_work);
 }
 
@@ -1444,7 +1443,7 @@ static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
 {
         int i;
 
-        for (i = 0; i <= xfrm_state_hmask; i++) {
+        for (i = 0; i <= init_net.xfrm.state_hmask; i++) {
                 struct hlist_node *entry;
                 struct xfrm_state *x;
 
@@ -2088,7 +2087,7 @@ int __net_init xfrm_state_init(struct net *net)
         net->xfrm.state_byspi = xfrm_hash_alloc(sz);
         if (!net->xfrm.state_byspi)
                 goto out_byspi;
-        xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
+        net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
 
         INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task);
         return 0;
@@ -2107,7 +2106,7 @@ void xfrm_state_fini(struct net *net)
 
         WARN_ON(!list_empty(&net->xfrm.state_all));
 
-        sz = (xfrm_state_hmask + 1) * sizeof(struct hlist_head);
+        sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
         WARN_ON(!hlist_empty(net->xfrm.state_byspi));
         xfrm_hash_free(net->xfrm.state_byspi, sz);
         WARN_ON(!hlist_empty(net->xfrm.state_bysrc));