Date: Mon, 4 Jul 2016 07:42:40 GMT From: vincenzo@FreeBSD.org To: svn-soc-all@FreeBSD.org Subject: socsvn commit: r305707 - soc2016/vincenzo/head/sys/dev/netmap Message-ID: <201607040742.u647geDi049145@socsvn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: vincenzo Date: Mon Jul 4 07:42:39 2016 New Revision: 305707 URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=305707 Log: freebsd: introduce PTNET_TX_NOSPACE 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 Jul 4 07:42:30 2016 (r305706) +++ soc2016/vincenzo/head/sys/dev/netmap/if_ptnet.c Mon Jul 4 07:42:39 2016 (r305707) @@ -1164,6 +1164,13 @@ } } +/* This should be computed as MAX_FRAME_SIZE / NETMAP_BUF_SIZE */ +#define PTNET_TX_MIN_SLOTS 33 + +#define PTNET_TX_NOSPACE(h, k) \ + ((((h) < (k)->rtail) ? 0 : (k)->nkr_num_slots) + \ + (k)->rtail - (h)) < PTNET_TX_MIN_SLOTS + static int ptnet_transmit(struct ifnet *ifp, struct mbuf *m) { @@ -1221,13 +1228,13 @@ head = ring->head; for (;;) { - if (head == ring->tail) { + if (PTNET_TX_NOSPACE(head, kring)) { /* 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) { + if (PTNET_TX_NOSPACE(head, kring)) { /* Still no slots available. Reactivate the * interrupts so that we can be notified * when some free slots are made available by @@ -1236,7 +1243,7 @@ /* Double-check. */ ptnet_sync_tail(ptring, kring); - if (likely(head == ring->tail)) { + if (likely(PTNET_TX_NOSPACE(head, kring))) { break; }
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201607040742.u647geDi049145>