- 15 May, 2015 2 commits
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Eric Dumazet authored
Now we allow storing more request socks per listener, we might hit syncookie mode less often and hit following bug in our stack : When we send a burst of syncookies, then exit this mode, tcp_synq_no_recent_overflow() can return false if the ACK packets coming from clients are coming three seconds after the end of syncookie episode. This is a way too strong requirement and conflicts with rest of syncookie code which allows ACK to be aged up to 2 minutes. Perfectly valid ACK packets are dropped just because clients might be in a crowded wifi environment or on another planet. So let's fix this, and also change tcp_synq_overflow() to not dirty a cache line for every syncookie we send, as we are under attack. Signed-off-by:
Eric Dumazet <edumazet@google.com> Acked-by:
Florian Westphal <fw@strlen.de> Acked-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Alexander Duyck authored
The rx_dropped stat wasn't being reported when ip_tunnel_get_stats64 was called. This was leading to some confusing results in my debug as I was seeing rx_errors increment but no other value which pointed me toward the type of error being seen. This change corrects that by using netdev_stats_to_stats64 to copy all available dev stats instead of just the few that were hand picked. Signed-off-by:
Alexander Duyck <alexander.h.duyck@redhat.com> Signed-off-by:
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- 14 May, 2015 28 commits
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Willem de Bruijn authored
Avoid two xchg calls whose return values were unused, causing a warning on some architectures. The relevant variable is a hint and read without mutual exclusion. This fix makes all writers hold the receive_queue lock. Suggested-by:
Willem de Bruijn <willemb@google.com> Signed-off-by:
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françois romieu authored
None of those drivers uses last_rx for its own needs. See 4dc89133 ("net: add a comment on netdev->last_rx") for reference. Signed-off-by:
Francois Romieu <romieu@fr.zoreil.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Zhangfei Gao <zhangfei.gao@linaro.org> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Cc: Wingman Kwok <w-kwok2@ti.com> Cc: Murali Karicheri <m-karicheri2@ti.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by:
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David S. Miller authored
Florian Fainelli says: ==================== net: phy: broken turn-around support This is an attempt at solving the broken turn-around problem in a way that is not specific to the mdio-gpio driver, since it affects different kinds of platforms. We cannot make that localized to PHY device drivers because probing the PHY device which has a broken turn-around can fail as early as in get_phy_id(), therefore we need a bit of help from Device Tree/platform_data. ==================== Signed-off-by: -
Florian Fainelli authored
Update mdiobb_read() to read whether the PHY has a broken turn-around, and if it does, ignore it to make the read succeeed. Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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Florian Fainelli authored
Some Ethernet PHY devices/switches may not properly release the MDIO bus during turn-around time, and fail to drive it low, which can be seen by some controllers as a read failure, while the data clocked in is still correct. Add a boolean property "broken-turn-around" which is parsed by the generic MDIO bus probing code and will set the corresponding bit in the MDIO bus phy_ignore_ta_mask bitmask for MDIO bus drivers to utilize that information. Signed-off-by:
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Florian Fainelli authored
Some PHY devices/switches will not release the turn-around line as they should do at the end of a MDIO transaction. To help with such situations, allow MDIO bus drivers to be made aware of such restrictions. Signed-off-by:
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Ying Xue authored
After commit eeb1bd5c ("net: Add a struct net parameter to sock_create_kern"), we should use sock_create_kern() to create kernel socket as the interface doesn't reference count struct net any more. Signed-off-by:
Ying Xue <ying.xue@windriver.com> Signed-off-by:
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Brian Haley authored
Fix compile error in net/sched/cls_flower.c net/sched/cls_flower.c: In function ‘fl_set_key’: net/sched/cls_flower.c:240:3: error: implicit declaration of function ‘tcf_change_indev’ [-Werror=implicit-function-declaration] err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]); Introduced in 77b9900e Fixes: 77b9900e ("tc: introduce Flower classifier") Signed-off-by:Brian Haley <brian.haley@hp.com> Signed-off-by:
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David S. Miller authored
Jon Maloy says: ==================== tipc: some link layer improvements We continue eliminating redundant complexity at the link layer, and add a couple of improvements to the packet sending functionality. ==================== Signed-off-by: -
Jon Paul Maloy authored
Currently, the packet sequence number is updated and added to each packet at the moment a packet is added to the link backlog queue. This is wasteful, since it forces the code to traverse the send packet list packet by packet when adding them to the backlog queue. It would be better to just splice the whole packet list into the backlog queue when that is the right action to do. In this commit, we do this change. Also, since the sequence numbers cannot now be assigned to the packets at the moment they are added the backlog queue, we do instead calculate and add them at the moment of transmission, when the backlog queue has to be traversed anyway. We do this in the function tipc_link_push_packet(). Reviewed-by:
Erik Hugne <erik.hugne@ericsson.com> Reviewed-by:
Jon Maloy <jon.maloy@ericsson.com> Signed-off-by:
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Jon Paul Maloy authored
The link congestion algorithm used until now implies two problems. - It is too generous towards lower-level messages in situations of high load by giving "absolute" bandwidth guarantees to the different priority levels. LOW traffic is guaranteed 10%, MEDIUM is guaranted 20%, HIGH is guaranteed 30%, and CRITICAL is guaranteed 40% of the available bandwidth. But, in the absence of higher level traffic, the ratio between two distinct levels becomes unreasonable. E.g. if there is only LOW and MEDIUM traffic on a system, the former is guaranteed 1/3 of the bandwidth, and the latter 2/3. This again means that if there is e.g. one LOW user and 10 MEDIUM users, the former will have 33.3% of the bandwidth, and the others will have to compete for the remainder, i.e. each will end up with 6.7% of the capacity. - Packets of type MSG_BUNDLER are created at SYSTEM importance level, but only after the packets bundled into it have passed the congestion test for their own respective levels. Since bundled packets don't result in incrementing the level counter for their own importance, only occasionally for the SYSTEM level counter, they do in practice obtain SYSTEM level importance. Hence, the current implementation provides a gap in the congestion algorithm that in the worst case may lead to a link reset. We now refine the congestion algorithm as follows: - A message is accepted to the link backlog only if its own level counter, and all superior level counters, permit it. - The importance of a created bundle packet is set according to its contents. A bundle packet created from messges at levels LOW to CRITICAL is given importance level CRITICAL, while a bundle created from a SYSTEM level message is given importance SYSTEM. In the latter case only subsequent SYSTEM level messages are allowed to be bundled into it. This solves the first problem described above, by making the bandwidth guarantee relative to the total number of users at all levels; only the upper limit for each level remains absolute. In the example described above, the single LOW user would use 1/11th of the bandwidth, the same as each of the ten MEDIUM users, but he still has the same guarantee against starvation as the latter ones. The fix also solves the second problem. If the CRITICAL level is filled up by bundle packets of that level, no lower level packets will be accepted any more. Suggested-by:
Gergely Kiss <gergely.kiss@ericsson.com> Reviewed-by:
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Jon Paul Maloy authored
We change the sequence number checkpointing that is performed by the timer in order to discover if the peer is active. Currently, we store a checkpoint of the next expected sequence number "rcv_nxt" at each timer expiration, and compare it to the current expected number at next timeout expiration. Instead, we now use the already existing field "silent_intv_cnt" for this task. We step the counter at each timeout expiration, and zero it at each valid received packet. If no valid packet has been received from the peer after "abort_limit" number of silent timer intervals, the link is declared faulty and reset. We also remove the multiple instances of timer activation from inside the FSM function "link_state_event()", and now do it at only one place; at the end of the timer function itself. Reviewed-by:
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Jon Paul Maloy authored
We rename some fields in struct tipc_link, in order to give them more descriptive names: next_in_no -> rcv_nxt next_out_no-> snd_nxt fsm_msg_cnt-> silent_intv_cnt cont_intv -> keepalive_intv last_retransmitted -> last_retransm There are no functional changes in this commit. Reviewed-by:
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Jon Paul Maloy authored
Although the sequence number in the TIPC protocol is 16 bits, we have until now stored it internally as an unsigned 32 bits integer. We got around this by always doing explicit modulo-65535 operations whenever we need to access a sequence number. We now make the incoming and outgoing sequence numbers to unsigned 16-bit integers, and remove the modulo operations where applicable. We also move the arithmetic inline functions for 16 bit integers to core.h, and the function buf_seqno() to msg.h, so they can easily be accessed from anywhere in the code. Reviewed-by:
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Jon Paul Maloy authored
When we try to add new inline functions in the code, we sometimes run into circular include dependencies. The main problem is that the file core.h, which really should be at the root of the dependency chain, instead is a leaf. I.e., core.h includes a number of header files that themselves should be allowed to include core.h. In reality this is unnecessary, because core.h does not need to know the full signature of any of the structs it refers to, only their type declaration. In this commit, we remove all dependencies from core.h towards any other tipc header file. As a consequence of this change, we can now move the function tipc_own_addr(net) from addr.c to addr.h, and make it inline. There are no functional changes in this commit. Reviewed-by:
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Jon Paul Maloy authored
Prior to this commit, the link timer has been running at a "continuity interval" of configured link tolerance/4. When a timer wakes up and discovers that there has been no sign of life from the peer during the previous interval, it divides its own timer interval by another factor four, and starts sending one probe per new interval. When the configured link tolerance time has passed without answer, i.e. after 16 unacked probes, the link is declared faulty and reset. This is unnecessary complex. It is sufficient to continue with the original continuity interval, and instead reset the link after four missed probe responses. This makes the timer handling in the link simpler, and opens up for some planned later changes in this area. This commit implements this change. Reviewed-by:
Richard Alpe <richard.alpe@ericsson.com> Reviewed-by:
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Jon Paul Maloy authored
Since commit 4b475e3f2f8e4e241de101c8240f1d74d0470494 ("tipc: eliminate delayed link deletion at link failover") the extra boolean parameter "shutting_down" is not any longer needed for the functions bearer_disable() and tipc_link_delete_list(). Furhermore, the function tipc_link_reset_links(), called from bearer_reset() is now unnecessary. We can just as well delete all the links, as we do in bearer_disable(), and start over with creating new links. This commit introduces those changes. Reviewed-by: -
David S. Miller authored
Venkat Duvvuru says: ==================== be2net: patch-set The following patch set has one new feature addition and two fixes. Patch 1 adds support for hwmon sysfs interface to display board temperature. Board temperature display through ethtool statistics is removed. Patch 2 reports "link down" in a few more error cases which are not handled currently. Patch 3 adds support for os2bmc. OS2BMC feature will allow the server to communicate with the on-board BMC/idrac (Baseboard Management Controller) over the LOM via standard Ethernet. More details are added in the commit log. Please review. ==================== Signed-off-by: -
Venkata Duvvuru authored
OS2BMC feature will allow the server to communicate with the on-board BMC/idrac (Baseboard Management Controller) over the LOM via standard Ethernet. When OS2BMC feature is enabled, the LOM will filter traffic coming from the host. If the destination MAC address matches the iDRAC MAC address, it will forward the packet to the NC-SI side band interface for iDRAC processing. Otherwise, it would send it out on the wire to the external network. Broadcast and multicast packets are sent on the side-band NC-SI channel and on the wire as well. Some of the packet filters are not supported in the NIC and hence driver will identify such packets and will hint the NIC to send those packets to the BMC. This is done by duplicating packets on the management ring. Packets are sent to the management ring, by setting mgmt bit in the wrb header. The NIC will forward the packets on the management ring to the BMC through the side-band NC-SI channel. Please refer to this online document for more details, http://www.dell.com/downloads/global/products/pedge/ os_to_bmc_passthrough_a_new_chapter_in_system_management.pdf Signed-off-by:
Venkat Duvvuru <VenkatKumar.Duvvuru@Emulex.com> Signed-off-by:
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Venkata Duvvuru authored
When an error (related to HW or FW) is detected on a function, the driver must pro-actively report a "link down" to the stack so that a possible failover can be initiated. This is being done currently only for some HW errors. This patch reports a "link down" even for fatal FW errors and EEH errors. Signed-off-by:
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Venkata Duvvuru authored
Ethtool statistics is not the right place to display board temperature. This patch adds support to export die temperature of devices supported by be2net driver via the sysfs hwmon interface. Signed-off-by:
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David S. Miller authored
Pablo Neira Ayuso says: ==================== Netfilter ingress support (v4) This is the v4 round of patches to add the Netfilter ingress hook, it basically comes in two steps: 1) Add the CONFIG_NET_INGRESS switch to wrap the ingress static key around it. The idea is to use the same global static key to avoid adding more code to the hot path. 2) Add the Netfilter ingress hook after the tc ingress hook, under the global ingress_needed static key. As I said, the netfilter ingress hook also has its own static key, that is nested under the global static key. Please, see patch 5/5 for performance numbers and more information. I originally started this next round, as it was suggested, exploring the independent static key for netfilter ingress just after tc ingress, but the results that I gathered from that patch are not good for non-users: Result: OK: 6425927(c6425843+d83) usec, 100000000 (60byte,0frags) 15561955pps 7469Mb/sec (7469738400bps) errors: 100000000 this roughly means 500Kpps less performance wrt. the base numbers, so that's the reason why I discarded that approach and I focused on this. The idea of this patchset is to open the window to nf_tables, which comes with features that will work out-of-the-box (once the boiler plate code to support the 'netdev' table family is in place), to avoid repeating myself [1], the most relevant features are: 1) Multi-dimensional key dictionary lookups. 2) Arbitrary stateful flow tables. 3) Transactions and good support for dynamic updates. But there are also interest aspects to consider from userspace, such as the ability to support new layer 2 protocols without kernel updates, a well-defined netlink interface, userspace libraries and utilities for third party applications, among others. I hope we can be happy with this approach. Please, apply. Thanks. [1] http://marc.info/?l=netfilter-devel&m=143033337020328&w=2 ==================== Signed-off-by:
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Pablo Neira authored
This patch adds the Netfilter ingress hook just after the existing tc ingress hook, that seems to be the consensus solution for this. Note that the Netfilter hook resides under the global static key that enables ingress filtering. Nonetheless, Netfilter still also has its own static key for minimal impact on the existing handle_ing(). * Without this patch: Result: OK: 6216490(c6216338+d152) usec, 100000000 (60byte,0frags) 16086246pps 7721Mb/sec (7721398080bps) errors: 100000000 42.46% kpktgend_0 [kernel.kallsyms] [k] __netif_receive_skb_core 25.92% kpktgend_0 [kernel.kallsyms] [k] kfree_skb 7.81% kpktgend_0 [pktgen] [k] pktgen_thread_worker 5.62% kpktgend_0 [kernel.kallsyms] [k] ip_rcv 2.70% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_internal 2.34% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_sk 1.44% kpktgend_0 [kernel.kallsyms] [k] __build_skb * With this patch: Result: OK: 6214833(c6214731+d101) usec, 100000000 (60byte,0frags) 16090536pps 7723Mb/sec (7723457280bps) errors: 100000000 41.23% kpktgend_0 [kernel.kallsyms] [k] __netif_receive_skb_core 26.57% kpktgend_0 [kernel.kallsyms] [k] kfree_skb 7.72% kpktgend_0 [pktgen] [k] pktgen_thread_worker 5.55% kpktgend_0 [kernel.kallsyms] [k] ip_rcv 2.78% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_internal 2.06% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_sk 1.43% kpktgend_0 [kernel.kallsyms] [k] __build_skb * Without this patch + tc ingress: tc filter add dev eth4 parent ffff: protocol ip prio 1 \ u32 match ip dst 4.3.2.1/32 Result: OK: 9269001(c9268821+d179) usec, 100000000 (60byte,0frags) 10788648pps 5178Mb/sec (5178551040bps) errors: 100000000 40.99% kpktgend_0 [kernel.kallsyms] [k] __netif_receive_skb_core 17.50% kpktgend_0 [kernel.kallsyms] [k] kfree_skb 11.77% kpktgend_0 [cls_u32] [k] u32_classify 5.62% kpktgend_0 [kernel.kallsyms] [k] tc_classify_compat 5.18% kpktgend_0 [pktgen] [k] pktgen_thread_worker 3.23% kpktgend_0 [kernel.kallsyms] [k] tc_classify 2.97% kpktgend_0 [kernel.kallsyms] [k] ip_rcv 1.83% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_internal 1.50% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_sk 0.99% kpktgend_0 [kernel.kallsyms] [k] __build_skb * With this patch + tc ingress: tc filter add dev eth4 parent ffff: protocol ip prio 1 \ u32 match ip dst 4.3.2.1/32 Result: OK: 9308218(c9308091+d126) usec, 100000000 (60byte,0frags) 10743194pps 5156Mb/sec (5156733120bps) errors: 100000000 42.01% kpktgend_0 [kernel.kallsyms] [k] __netif_receive_skb_core 17.78% kpktgend_0 [kernel.kallsyms] [k] kfree_skb 11.70% kpktgend_0 [cls_u32] [k] u32_classify 5.46% kpktgend_0 [kernel.kallsyms] [k] tc_classify_compat 5.16% kpktgend_0 [pktgen] [k] pktgen_thread_worker 2.98% kpktgend_0 [kernel.kallsyms] [k] ip_rcv 2.84% kpktgend_0 [kernel.kallsyms] [k] tc_classify 1.96% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_internal 1.57% kpktgend_0 [kernel.kallsyms] [k] netif_receive_skb_sk Note that the results are very similar before and after. I can see gcc gets the code under the ingress static key out of the hot path. Then, on that cold branch, it generates the code to accomodate the netfilter ingress static key. My explanation for this is that this reduces the pressure on the instruction cache for non-users as the new code is out of the hot path, and it comes with minimal impact for tc ingress users. Using gcc version 4.8.4 on: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 8 [...] L1d cache: 16K L1i cache: 64K L2 cache: 2048K L3 cache: 8192K Signed-off-by:Pablo Neira Ayuso <pablo@netfilter.org> Acked-by:
Alexei Starovoitov <ast@plumgrid.com> Signed-off-by:
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Pablo Neira authored
This new config switch enables the ingress filtering infrastructure that is controlled through the ingress_needed static key. This prepares the introduction of the Netfilter ingress hook that resides under this unique static key. Note that CONFIG_SCH_INGRESS automatically selects this, that should be no problem since this also depends on CONFIG_NET_CLS_ACT. Signed-off-by:
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Pablo Neira authored
In preparation to have netfilter ingress per-device hook list. Signed-off-by:
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Pablo Neira authored
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Pablo Neira authored
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Dan Carpenter authored
The bitwise tests are always true here because it uses '|' where '&' is intended. Fixes: 98b5a0f4 ('net: macb: Add support for jumbo frames') Signed-off-by:
Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by:
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- 13 May, 2015 10 commits
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Alexander Duyck authored
When I had inlined __alloc_rx_skb into __netdev_alloc_skb and __napi_alloc_skb I had overlooked the fact that there was a return in the __alloc_rx_skb. As a result we weren't reserving headroom or setting the skb->dev in certain cases. This change corrects that by adding a couple of jump labels to jump to depending on __alloc_skb either succeeding or failing. Fixes: 9451980a ("net: Use cached copy of pfmemalloc to avoid accessing page") Reported-by:
Felipe Balbi <balbi@ti.com> Signed-off-by:
Kevin Hilman <khilman@linaro.org> Signed-off-by:
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David S. Miller authored
John W. Linville says: ==================== add GENEVE netdev tunnel driver This 5-patch kernel series adds a netdev implementation of a GENEVE tunnel driver, and the single iproute2 patch enables creation and such for those netdevs. This makes use of the existing GENEVE infrastructure already used by the OVS code. The net/ipv4/geneve.c file is renamed as net/ipv4/geneve_core.c as part of these changes. drivers/net/Kconfig | 14 + drivers/net/Makefile | 1 drivers/net/geneve.c | 503 +++++++++++++++++++++++++++++++++++++++++ include/net/geneve.h | 5 include/uapi/linux/if_link.h | 9 net/ipv4/Kconfig | 4 net/ipv4/Makefile | 2 net/ipv4/geneve.c | 6 net/ipv4/geneve_core.c | 4 net/openvswitch/Kconfig | 2 net/openvswitch/vport-geneve.c | 5 11 files changed, 538 insertions(+), 17 deletions(-) The overall structure of the GENEVE netdev driver is strongly influenced by the VXLAN netdev driver. This is not surprising, as the two drivers are intended to serve similar purposes. As development of the GENEVE driver continues, it is likely that those similarities will grow stronger. This will include both simple configuration options (e.g. TOS and TTL settings) and new control plane support. The current implementation is very simple, restricting itself to point to point links over IPv4. This is due only to the simplicity of the implementation, and no such limit is inherent to GENEVE in any way. Support for IPv6 links and more sophisticated control plane options are predictable enhancements. Using the included iproute2 patch, a GENEVE tunnel is created thusly: ip link add dev gnv0 type geneve remote 192.168.22.1 vni 1234 ip link set gnv0 up ip addr add 10.1.1.1/24 dev gnv0 After a corresponding tunnel interface is created at the link partner, traffic should proceed as expected. Please let me know if anyone has problems...thanks! ==================== Signed-off-by: -
John W. Linville authored
This is an initial implementation of a netdev driver for GENEVE tunnels. This implementation uses a fixed UDP port, and only supports point-to-point links with specific partner endpoints. Only IPv4 links are supported at this time. Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
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John W. Linville authored
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John W. Linville authored
net/ipv4/geneve.c -> net/ipv4/geneve_core.c This name better reflects the purpose of the module. Signed-off-by:
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John W. Linville authored
This is a static inline with identical definitions in multiple places... Signed-off-by:
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John W. Linville authored
This file is essentially a library for implementing the geneve encapsulation protocol. The file does not register any rtnl_link_ops, so the MODULE_ALIAS_RTNL_LINK macro is inappropriate here. Signed-off-by:
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Pablo Neira authored
This fixes 4577139b ("net: use jump label patching for ingress qdisc in __netif_receive_skb_core"). The only client of this is sch_ingress and it depends on NET_CLS_ACT. So there is no way these definition can be of any help. Cc: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
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David S. Miller authored
Willem de Bruijn says: ==================== refine packet socket rollover: 1. mitigate a case of lock contention 2. avoid exporting resource exhaustion to other sockets, by migrating only to a victim socket that has ample room 3. avoid reordering of most flows on the socket, by migrating first the flow responsible for load imbalance 4. help processes detect load imbalance, by exporting rollover counters Context: rollover implements flow migration in packet socket fanout groups in case of extreme load imbalance. It is a specific implementation of migration that minimizes reordering by selecting the same victim socket when possible (and by selecting subsequent victims in a round robin fashion, from which its name derives). Changes: v2 -> v3: - statistics: replace unsigned long with __aligned_u64 v1 -> v2: - huge flow detection: run lockless - huge flow detection: replace stored index with random - contention avoidance: test in packet_poll while lock held - contention avoidance: clear pressure sooner packet_poll and packet_recvmsg would clear only if the sock is empty to avoid taking the necessary lock. But, * packet_poll already holds this lock, so a lockless variant __packet_rcv_has_room is cheap. * packet_recvmsg is usually called only for non-ring sockets, which also runs lockless. - preparation: drop "single return" patch packet_rcv_has_room is now a locked wrapper around __packet_rcv_has_room, achieving the same (single footer). The benchmark mentioned in the patches is at https://github.com/wdebruij/kerneltools/blob/master/tests/bench_rollover.c ==================== Signed-off-by: -
Willem de Bruijn authored
Rollover indicates exceptional conditions. Export a counter to inform socket owners of this state. If no socket with sufficient room is found, rollover fails. Also count these events. Finally, also count when flows are rolled over early thanks to huge flow detection, to validate its correctness. Tested: Read counters in bench_rollover on all other tests in the patchset Signed-off-by:
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