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2018-02-16rds: hold a sock ref from rds_message to the rds_sockSowmini Varadhan2-7/+8
The existing model holds a reference from the rds_sock to the rds_message, but the rds_message does not itself hold a sock_put() on the rds_sock. Instead the m_rs field in the rds_message is assigned when the message is queued on the sock, and nulled when the message is dequeued from the sock. We want to be able to notify userspace when the rds_message is actually freed (from rds_message_purge(), after the refcounts to the rds_message go to 0). At the time that rds_message_purge() is called, the message is no longer on the rds_sock retransmit queue. Thus the explicit reference for the m_rs is needed to send a notification that will signal to userspace that it is now safe to free/reuse any pages that may have been pinned down for zerocopy. This patch manages the m_rs assignment in the rds_message with the necessary refcount book-keeping. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16skbuff: export mm_[un]account_pinned_pages for other modulesSowmini Varadhan2-2/+7
RDS would like to use the helper functions for managing pinned pages added by Commit a91dbff551a6 ("sock: ulimit on MSG_ZEROCOPY pages") Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: Revert sched action extack support series.David S. Miller4-28/+21
It was mis-applied and the changes had rejects. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: add extack to initAlexander Aring3-10/+16
This patch adds extack to tcf_action_init and tcf_action_init_1 functions. These are necessary to make individual extack handling in each act implementation. Based on work by David Ahern <dsahern@gmail.com> Cc: David Ahern <dsahern@gmail.com> Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: act: fix code styleAlexander Aring3-11/+12
This patch is used by subsequent patches. It fixes code style issues caught by checkpatch. Signed-off-by: Alexander Aring <aring@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: sched: fix unbalance in the error path of tca_action_flush()Davide Caratti1-1/+3
When tca_action_flush() calls the action walk() and gets an error, a successful call to nla_nest_start() is not followed by a call to nla_nest_cancel(). It's harmless, as the skb is freed in the error path - but it's worth to fix this unbalance. Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: dsa: mv88e6xxx: Release mutex between each ATU readAndrew Lunn1-6/+8
The PTP code needs low latency access to the PTP hardware timestamps. Reading all the ATU entries in one go adds a lot of latency to the PTP code. So take and release the reg_lock mutex for each individual MAC address in the ATU, allowing the PTP thread jump in between. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16net: dsa: mv88e6xxx: Release mutex between each statistics readAndrew Lunn1-4/+6
The PTP code needs low latency access to the PTP hardware timestamps. Reading all the statistics in one go adds a lot of latency to the PTP code. So take and release the reg_lock mutex for each individual statistics, allowing the PTP thread jump in between. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: rename tipc_server to tipc_topsrvJon Maloy7-259/+258
We rename struct tipc_server to struct tipc_topsrv. This reflect its now specialized role as topology server. Accoringly, we change or add function prefixes to make it clearer which functionality those belong to. There are no functional changes in this commit. Acked-by: Ying.Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: separate topology server listener socket from subcsriber socketsJon Maloy1-181/+147
We move the listener socket to struct tipc_server and give it its own work item. This makes it easier to follow the code, and entails some simplifications in the reception code in subscriber sockets. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: make struct tipc_server private for server.cJon Maloy5-128/+110
In order to narrow the interface and dependencies between the topology server and the subscription/binding table functionality we move struct tipc_server inside the file server.c. This requires some code adaptations in other files, but those are mostly minor. The most important change is that we have to move the start/stop functions for the topology server to server.c, where they logically belong anyway. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: some prefix changesJon Maloy4-56/+54
Since we now have removed struct tipc_subscriber from the code, and only struct tipc_subscription remains, there is no longer need for long and awkward prefixes to distinguish between their pertaining functions. We now change all tipc_subscrp_* prefixes to tipc_sub_*. This is a purely cosmetic change. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: collapse subscription creation functionsJon Maloy4-43/+22
After the previous changes it becomes logical to collapse the two-level creation of subscription instances into one. We do that here. We also rename the creation and deletion functions for more consistency. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: simplify endianness handling in topology subscriberJon Maloy5-102/+86
Because of the requirement for total distribution transparency, users send subscriptions and receive topology events in their own host format. It is up to the topology server to determine this format and do the correct conversions to and from its own host format when needed. Until now, this has been handled in a rather non-transparent way inside the topology server and subscriber code, leading to unnecessary complexity when creating subscriptions and issuing events. We now improve this situation by adding two new macros, tipc_sub_read() and tipc_evt_write(). Both those functions calculate the need for conversion internally before performing their respective operations. Hence, all handling of such conversions become transparent to the rest of the code. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: simplify interaction between subscription and topology connectionJon Maloy5-149/+88
The message transmission and reception in the topology server is more generic than is currently necessary. By basing the funtionality on the fact that we only send items of type struct tipc_event and always receive items of struct tipc_subcr we can make several simplifications, and also get rid of some unnecessary dynamic memory allocations. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: eliminate struct tipc_subscriberJon Maloy4-207/+146
It is unnecessary to keep two structures, struct tipc_conn and struct tipc_subscriber, with a one-to-one relationship and still with different life cycles. The fact that the two often run in different contexts, and still may access each other via direct pointers constitutes an additional hazard, something we have experienced at several occasions, and still see happening. We have identified at least two remaining problems that are easier to fix if we simplify the topology server data structure somewhat. - When there is a race between a subscription up/down event and a timeout event, it is fully possible that the former might be delivered after the latter, leading to confusion for the receiver. - The function tipc_subcrp_timeout() is executing in interrupt context, while the following call chain is at least theoretically possible: tipc_subscrp_timeout() tipc_subscrp_send_event() tipc_conn_sendmsg() conn_put() tipc_conn_kref_release() sock_release(sock) I.e., we end up calling a function that might try to sleep in interrupt context. To eliminate this, we need to ensure that the tipc_conn structure and the socket, as well as the subscription instances, only are deleted in work queue context, i.e., after the timeout event really has been sent out. We now remove this unnecessary complexity, by merging data and functionality of the subscriber structure into struct tipc_conn and the associated file server.c. We thereafter add a spinlock and a new 'inactive' state to the subscription structure. Using those, both problems described above can be easily solved. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: remove unnecessary function pointersJon Maloy4-37/+20
Interaction between the functionality in server.c and subscr.c is done via function pointers installed in struct server. This makes the code harder to follow, and doesn't serve any obvious purpose. Here, we replace the function pointers with direct function calls. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: remove redundant code in topology serverJon Maloy3-35/+9
The socket handling in the topology server is unnecessarily generic. It is prepared to handle both SOCK_RDM, SOCK_DGRAM and SOCK_STREAM type sockets, as well as the only socket type which is really used, SOCK_SEQPACKET. We now remove this redundant code to make the code more readable. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-15selftests/net: fixes psock_fanout eBPF test casePrashant Bhole1-1/+2
eBPF test fails due to verifier failure because log_buf is too small. Fixed by increasing log_buf size Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-15net/ipv4: Remove fib table id from rtableDavid Ahern4-12/+1
Remove rt_table_id from rtable. It was added for getroute to return the table id that was hit in the lookup. With the changes for fibmatch the table id can be extracted from the fib_info returned in the fib_result so it no longer needs to be in rtable directly. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-15tools: tc-testing: Update README and TODOBrenda J. Butler2-19/+179
Signed-off-by: Brenda J. Butler <bjb@mojatatu.com> Acked-by: Lucas Bates <lucasb@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>