kernel/include/net/busy_poll.h, branch linux-4.15.y

net: fix compilation when busy poll is not enabled

2017-08-11T21:59:24Z

MIN_NAPI_ID is used in various places outside of CONFIG_NET_RX_BUSY_POLL wrapping, so when it's not set we run into build errors such as: net/core/dev.c: In function 'dev_get_by_napi_id': net/core/dev.c:886:16: error: ‘MIN_NAPI_ID’ undeclared (first use in this function) if (napi_id < MIN_NAPI_ID) ^~~~~~~~~~~ Thus, have MIN_NAPI_ID always defined to fix these errors. Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller

net: Commonize busy polling code to focus on napi_id instead of socket

2017-03-25T03:49:31Z

Move the core functionality in sk_busy_loop() to napi_busy_loop() and make it independent of sk. This enables re-using this function in epoll busy loop implementation. Signed-off-by: Sridhar Samudrala Signed-off-by: Alexander Duyck Acked-by: Eric Dumazet Signed-off-by: David S. Miller

net: Track start of busy loop instead of when it should end

2017-03-25T03:49:31Z

This patch flips the logic we were using to determine if the busy polling has timed out. The main motivation for this is that we will need to support two different possible timeout values in the future and by recording the start time rather than when we would want to end we can focus on making the end_time specific to the task be it epoll or socket based polling. Signed-off-by: Alexander Duyck Acked-by: Eric Dumazet Signed-off-by: David S. Miller

net: Change return type of sk_busy_loop from bool to void

2017-03-25T03:49:30Z

checking the return value of sk_busy_loop. As there are only a few consumers of that data, and the data being checked for can be replaced with a check for !skb_queue_empty() we might as well just pull the code out of sk_busy_loop and place it in the spots that actually need it. Signed-off-by: Alexander Duyck Acked-by: Eric Dumazet Signed-off-by: David S. Miller

net: Only define skb_mark_napi_id in one spot instead of two

2017-03-25T03:49:30Z

Instead of defining two versions of skb_mark_napi_id I think it is more readable to just match the format of the sk_mark_napi_id functions and just wrap the contents of the function instead of defining two versions of the function. This way we can save a few lines of code since we only need 2 of the ifdef/endif but needed 5 for the extra function declaration. Signed-off-by: Alexander Duyck Acked-by: Eric Dumazet Signed-off-by: David S. Miller

net: Busy polling should ignore sender CPUs

2017-03-25T03:49:30Z

This patch is a cleanup/fix for NAPI IDs following the changes that made it so that sender_cpu and napi_id were doing a better job of sharing the same location in the sk_buff. One issue I found is that we weren't validating the napi_id as being valid before we started trying to setup the busy polling. This change corrects that by using the MIN_NAPI_ID value that is now used in both allocating the NAPI IDs, as well as validating them. Signed-off-by: Alexander Duyck Acked-by: Eric Dumazet Signed-off-by: David S. Miller

sched/headers: Prepare to move signal wakeup & sigpending methods from into

2017-03-02T07:42:32Z

Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:27Z

We are going to split out of , which will have to be picked up from other headers and .c files. Create a trivial placeholder file that just maps to to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds Cc: Mike Galbraith Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

net: busy-poll: remove LL_FLUSH_FAILED and LL_FLUSH_BUSY

2017-02-14T03:23:39Z

Commit 79e7fff47b7b ("net: remove support for per driver ndo_busy_poll()") made them obsolete. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller

udp: enable busy polling for all sockets

2016-11-18T15:44:31Z

UDP busy polling is restricted to connected UDP sockets. This is because sk_busy_loop() only takes care of one NAPI context. There are cases where it could be extended. 1) Some hosts receive traffic on a single NIC, with one RX queue. 2) Some applications use SO_REUSEPORT and associated BPF filter to split the incoming traffic on one UDP socket per RX queue/thread/cpu 3) Some UDP sockets are used to send/receive traffic for one flow, but they do not bother with connect() This patch records the napi_id of first received skb, giving more reach to busy polling. Tested: lpaa23:~# echo 70 >/proc/sys/net/core/busy_read lpaa24:~# echo 70 >/proc/sys/net/core/busy_read lpaa23:~# for f in `seq 1 10`; do ./super_netperf 1 -H lpaa24 -t UDP_RR -l 5; done Before patch : 27867 28870 37324 41060 41215 36764 36838 44455 41282 43843 After patch : 73920 73213 70147 74845 71697 68315 68028 75219 70082 73707 Signed-off-by: Eric Dumazet Cc: Willem de Bruijn Signed-off-by: David S. Miller