Date: Tue, 30 Mar 2021 06:29:47 GMT From: Vincenzo Maffione <vmaffione@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 51cc31088bf4 - main - netmap: bridge: fix transmission in busy-wait mode Message-ID: <202103300629.12U6TlCT054175@gitrepo.freebsd.org>
next in thread | raw e-mail | index | archive | help
The branch main has been updated by vmaffione: URL: https://cgit.FreeBSD.org/src/commit/?id=51cc31088bf4d23a6ad0bfe8851adaa049d750fc commit 51cc31088bf4d23a6ad0bfe8851adaa049d750fc Author: Vincenzo Maffione <vmaffione@FreeBSD.org> AuthorDate: 2021-03-30 06:24:56 +0000 Commit: Vincenzo Maffione <vmaffione@FreeBSD.org> CommitDate: 2021-03-30 06:24:56 +0000 netmap: bridge: fix transmission in busy-wait mode In busy-wait mode (BUSYWAIT defined), NIOCTXSYNC should be performed after packets have been moved to the TX ring (rather than before). Before the change, moved packets may stall for an indefinite time in the TX ring. MFC after: 1 week --- tools/tools/netmap/bridge.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/tools/tools/netmap/bridge.c b/tools/tools/netmap/bridge.c index 77d235bf6e08..0c8f56265ff4 100644 --- a/tools/tools/netmap/bridge.c +++ b/tools/tools/netmap/bridge.c @@ -17,6 +17,10 @@ #include <stdlib.h> #include <unistd.h> +#if defined(_WIN32) +#define BUSYWAIT +#endif + static int verbose = 0; static int do_abort = 0; @@ -321,21 +325,19 @@ main(int argc, char **argv) pollfd[0].revents = pollfd[1].revents = 0; n0 = rx_slots_avail(pa); n1 = rx_slots_avail(pb); -#if defined(_WIN32) || defined(BUSYWAIT) +#ifdef BUSYWAIT if (n0) { - ioctl(pollfd[1].fd, NIOCTXSYNC, NULL); pollfd[1].revents = POLLOUT; } else { ioctl(pollfd[0].fd, NIOCRXSYNC, NULL); } if (n1) { - ioctl(pollfd[0].fd, NIOCTXSYNC, NULL); pollfd[0].revents = POLLOUT; } else { ioctl(pollfd[1].fd, NIOCRXSYNC, NULL); } ret = 1; -#else +#else /* !defined(BUSYWAIT) */ if (n0) pollfd[1].events |= POLLOUT; else @@ -347,7 +349,7 @@ main(int argc, char **argv) /* poll() also cause kernel to txsync/rxsync the NICs */ ret = poll(pollfd, 2, 2500); -#endif /* defined(_WIN32) || defined(BUSYWAIT) */ +#endif /* !defined(BUSYWAIT) */ if (ret <= 0 || verbose) D("poll %s [0] ev %x %x rx %d@%d tx %d," " [1] ev %x %x rx %d@%d tx %d", @@ -375,11 +377,19 @@ main(int argc, char **argv) D("error on fd1, rx [%d,%d,%d)", rx->head, rx->cur, rx->tail); } - if (pollfd[0].revents & POLLOUT) + if (pollfd[0].revents & POLLOUT) { ports_move(pb, pa, burst, msg_b2a); +#ifdef BUSYWAIT + ioctl(pollfd[0].fd, NIOCTXSYNC, NULL); +#endif + } - if (pollfd[1].revents & POLLOUT) + if (pollfd[1].revents & POLLOUT) { ports_move(pa, pb, burst, msg_a2b); +#ifdef BUSYWAIT + ioctl(pollfd[1].fd, NIOCTXSYNC, NULL); +#endif + } /* * We don't need ioctl(NIOCTXSYNC) on the two file descriptors.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?202103300629.12U6TlCT054175>