Date: Mon, 27 Jun 2016 12:48:55 GMT From: vincenzo@FreeBSD.org To: svn-soc-all@FreeBSD.org Subject: socsvn commit: r305588 - soc2016/vincenzo/head/sys/dev/netmap Message-ID: <201606271248.u5RCmtCT081316@socsvn.freebsd.org>
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Author: vincenzo Date: Mon Jun 27 12:48:55 2016 New Revision: 305588 URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=305588 Log: freebsd: ptnet_transmit: ptnet_sync_tail when running out of slots Modified: soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Modified: soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c ============================================================================== --- soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Mon Jun 27 12:48:45 2016 (r305587) +++ soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Mon Jun 27 12:48:55 2016 (r305588) @@ -1219,16 +1219,26 @@ ring = kring->ring; lim = kring->nkr_num_slots - 1; - /* Update hwcur and hwtail (completed TX slots) as known by the host, - * by reading from CSB. */ - ptnet_sync_tail(ptring, kring); - + /* Initialize transmission state variables. */ head = ring->head; slot = ring->slot + head; nmbuf = NMB(na, slot); nmbuf_bytes = 0; - while (head != ring->tail) { + for (;;) { + if (head == ring->tail) { + /* We ran out of slot, let's see if the host has + * freed up some, by reading hwcur and hwtail from + * the CSB. */ + ptnet_sync_tail(ptring, kring); + } + + if (head == ring->tail) { + /* Still no slots available, let's stop and wait + * for interrupts. */ + break; + } + m = drbr_peek(ifp, pq->bufring); if (!m) { break;
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