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Tobias Powalowski
parent
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From 37b12910dd11d9ab969f2c310dc9160b7f3e3405 Mon Sep 17 00:00:00 2001
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From: Raanan Avargil <raanan.avargil@intel.com>
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Date: Sun, 19 Jul 2015 16:33:20 +0300
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Subject: [PATCH] e1000e: Fix tight loop implementation of systime read
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algorithm
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Change the algorithm. Read systimel twice and check for overflow.
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If there was no overflow, use the first value.
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If there was an overflow, read systimeh again and use the second
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systimel value.
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Signed-off-by: Raanan Avargil <raanan.avargil@intel.com>
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Tested-by: Aaron Brown <aaron.f.brown@intel.com>
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Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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---
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drivers/net/ethernet/intel/e1000e/netdev.c | 31 ++++++++++++++++++++----------
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1 file changed, 21 insertions(+), 10 deletions(-)
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diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
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index 24b7269..96a8166 100644
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--- a/drivers/net/ethernet/intel/e1000e/netdev.c
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+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
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@@ -4280,18 +4280,29 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
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struct e1000_adapter *adapter = container_of(cc, struct e1000_adapter,
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cc);
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struct e1000_hw *hw = &adapter->hw;
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+ u32 systimel_1, systimel_2, systimeh;
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cycle_t systim, systim_next;
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- /* SYSTIMH latching upon SYSTIML read does not work well. To fix that
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- * we don't want to allow overflow of SYSTIML and a change to SYSTIMH
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- * to occur between reads, so if we read a vale close to overflow, we
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- * wait for overflow to occur and read both registers when its safe.
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+ /* SYSTIMH latching upon SYSTIML read does not work well.
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+ * This means that if SYSTIML overflows after we read it but before
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+ * we read SYSTIMH, the value of SYSTIMH has been incremented and we
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+ * will experience a huge non linear increment in the systime value
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+ * to fix that we test for overflow and if true, we re-read systime.
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*/
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- u32 systim_overflow_latch_fix = 0x3FFFFFFF;
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-
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- do {
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- systim = (cycle_t)er32(SYSTIML);
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- } while (systim > systim_overflow_latch_fix);
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- systim |= (cycle_t)er32(SYSTIMH) << 32;
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+ systimel_1 = er32(SYSTIML);
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+ systimeh = er32(SYSTIMH);
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+ systimel_2 = er32(SYSTIML);
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+ /* Check for overflow. If there was no overflow, use the values */
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+ if (systimel_1 < systimel_2) {
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+ systim = (cycle_t)systimel_1;
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+ systim |= (cycle_t)systimeh << 32;
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+ } else {
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+ /* There was an overflow, read again SYSTIMH, and use
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+ * systimel_2
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+ */
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+ systimeh = er32(SYSTIMH);
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+ systim = (cycle_t)systimel_2;
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+ systim |= (cycle_t)systimeh << 32;
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+ }
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if ((hw->mac.type == e1000_82574) || (hw->mac.type == e1000_82583)) {
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u64 incvalue, time_delta, rem, temp;
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--
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2.5.1
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@ -1,103 +0,0 @@
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From 9cf94eab8b309e8bcc78b41dd1561c75b537dd0b Mon Sep 17 00:00:00 2001
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From: Daniel Borkmann <daniel@iogearbox.net>
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Date: Mon, 31 Aug 2015 19:11:02 +0200
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Subject: [PATCH] netfilter: conntrack: use nf_ct_tmpl_free in CT/synproxy
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error paths
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Commit 0838aa7fcfcd ("netfilter: fix netns dependencies with conntrack
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templates") migrated templates to the new allocator api, but forgot to
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update error paths for them in CT and synproxy to use nf_ct_tmpl_free()
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instead of nf_conntrack_free().
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Due to that, memory is being freed into the wrong kmemcache, but also
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we drop the per net reference count of ct objects causing an imbalance.
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In Brad's case, this leads to a wrap-around of net->ct.count and thus
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lets __nf_conntrack_alloc() refuse to create a new ct object:
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[ 10.340913] xt_addrtype: ipv6 does not support BROADCAST matching
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[ 10.810168] nf_conntrack: table full, dropping packet
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[ 11.917416] r8169 0000:07:00.0 eth0: link up
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[ 11.917438] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
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[ 12.815902] nf_conntrack: table full, dropping packet
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[ 15.688561] nf_conntrack: table full, dropping packet
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[ 15.689365] nf_conntrack: table full, dropping packet
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[ 15.690169] nf_conntrack: table full, dropping packet
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[ 15.690967] nf_conntrack: table full, dropping packet
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[...]
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With slab debugging, it also reports the wrong kmemcache (kmalloc-512 vs.
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nf_conntrack_ffffffff81ce75c0) and reports poison overwrites, etc. Thus,
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to fix the problem, export and use nf_ct_tmpl_free() instead.
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Fixes: 0838aa7fcfcd ("netfilter: fix netns dependencies with conntrack templates")
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Reported-by: Brad Jackson <bjackson0971@gmail.com>
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Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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---
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include/net/netfilter/nf_conntrack.h | 1 +
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net/netfilter/nf_conntrack_core.c | 3 ++-
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net/netfilter/nf_synproxy_core.c | 2 +-
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net/netfilter/xt_CT.c | 2 +-
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4 files changed, 5 insertions(+), 3 deletions(-)
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diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
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index 37cd391..4023c4c 100644
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--- a/include/net/netfilter/nf_conntrack.h
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+++ b/include/net/netfilter/nf_conntrack.h
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@@ -292,6 +292,7 @@ extern unsigned int nf_conntrack_hash_rnd;
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void init_nf_conntrack_hash_rnd(void);
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struct nf_conn *nf_ct_tmpl_alloc(struct net *net, u16 zone, gfp_t flags);
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+void nf_ct_tmpl_free(struct nf_conn *tmpl);
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#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count)
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#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count)
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diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
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index 3c20d02..0625a42 100644
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--- a/net/netfilter/nf_conntrack_core.c
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+++ b/net/netfilter/nf_conntrack_core.c
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@@ -320,12 +320,13 @@ out_free:
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}
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EXPORT_SYMBOL_GPL(nf_ct_tmpl_alloc);
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-static void nf_ct_tmpl_free(struct nf_conn *tmpl)
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+void nf_ct_tmpl_free(struct nf_conn *tmpl)
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{
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nf_ct_ext_destroy(tmpl);
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nf_ct_ext_free(tmpl);
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kfree(tmpl);
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}
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+EXPORT_SYMBOL_GPL(nf_ct_tmpl_free);
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static void
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destroy_conntrack(struct nf_conntrack *nfct)
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diff --git a/net/netfilter/nf_synproxy_core.c b/net/netfilter/nf_synproxy_core.c
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index d7f1685..d6ee8f8 100644
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--- a/net/netfilter/nf_synproxy_core.c
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+++ b/net/netfilter/nf_synproxy_core.c
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@@ -378,7 +378,7 @@ static int __net_init synproxy_net_init(struct net *net)
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err3:
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free_percpu(snet->stats);
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err2:
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- nf_conntrack_free(ct);
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+ nf_ct_tmpl_free(ct);
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err1:
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return err;
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}
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diff --git a/net/netfilter/xt_CT.c b/net/netfilter/xt_CT.c
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index 43ddeee..f3377ce 100644
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--- a/net/netfilter/xt_CT.c
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+++ b/net/netfilter/xt_CT.c
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@@ -233,7 +233,7 @@ out:
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return 0;
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err3:
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- nf_conntrack_free(ct);
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+ nf_ct_tmpl_free(ct);
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err2:
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nf_ct_l3proto_module_put(par->family);
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err1:
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--
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2.5.1
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21
PKGBUILD
21
PKGBUILD
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@ -4,7 +4,7 @@
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pkgbase=linux # Build stock -ARCH kernel
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#pkgbase=linux-custom # Build kernel with a different name
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_srcname=linux-4.2
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pkgver=4.2.3
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pkgver=4.2.4
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pkgrel=1
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arch=('i686' 'x86_64')
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url="http://www.kernel.org/"
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@ -19,20 +19,16 @@ source=("https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
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'config' 'config.x86_64'
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# standard config files for mkinitcpio ramdisk
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'linux.preset'
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'change-default-console-loglevel.patch'
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'0001-e1000e-Fix-tight-loop-implementation-of-systime-read.patch'
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'0001-netfilter-conntrack-use-nf_ct_tmpl_free-in-CT-synpro.patch')
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'change-default-console-loglevel.patch')
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sha256sums=('cf20e044f17588d2a42c8f2a450b0fd84dfdbd579b489d93e9ab7d0e8b45dbeb'
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'SKIP'
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'e0e066f3fc5f310644e9f3f3ede47db7ac040f44782f0a5cf75ce2c940444972'
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'104ba869111c7ce037fc92646f9da7352412a73e84cde7467f29cd4b973d6e78'
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'SKIP'
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'6921399a0e304f6c64cff17226ce3f20ebe8194f14ebcd318989f2515d8248ad'
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'c3be602e0ce609b5fe5af2e631b01c8fba376a0c434206deca3d101b62685262'
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'f0d90e756f14533ee67afda280500511a62465b4f76adcc5effa95a40045179c'
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'1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
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'0b1e41ba59ae45f5929963aa22fdc53bc8ffb4534e976cec046269d1a462197b'
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'6ed9e31ae5614c289c4884620e45698e764c03670ebc45bab9319d741238cbd3')
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'1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99')
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validpgpkeys=(
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'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
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'647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
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@ -49,15 +45,6 @@ prepare() {
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# add latest fixes from stable queue, if needed
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# http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
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# fix hard lockup in e1000e_cyclecounter_read() after 4 hours of uptime
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# https://lkml.org/lkml/2015/8/18/292
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patch -p1 -i "${srcdir}/0001-e1000e-Fix-tight-loop-implementation-of-systime-read.patch"
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# add not-yet-mainlined patch to fix network unavailability when iptables
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# rules are applied during startup - happened with Shorewall; journal had
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# many instances of this error: nf_conntrack: table full, dropping packet
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patch -p1 -i "${srcdir}/0001-netfilter-conntrack-use-nf_ct_tmpl_free-in-CT-synpro.patch"
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# set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param)
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# remove this when a Kconfig knob is made available by upstream
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# (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
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