Date: Wed, 15 Jun 2016 21:08:51 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r301932 - head/sys/dev/cxgbe/tom Message-ID: <201606152108.u5FL8pcO012174@repo.freebsd.org>
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Author: jhb Date: Wed Jun 15 21:08:51 2016 New Revision: 301932 URL: https://svnweb.freebsd.org/changeset/base/301932 Log: Use sbused() instead of sbspace() to avoid signed issues. Inserting a full mbuf with an external cluster into the socket buffer resulted in sbspace() returning -MLEN. However, since sb_hiwat is unsigned, the -MLEN value was converted to unsigned in comparisons. As a result, the socket buffer was never autosized. Note that sb_lowat is signed to permit direct comparisons with sbspace(), but sb_hiwat is unsigned. Follow suit with what tcp_output() does and compare the value of sbused() with sb_hiwat instead. Approved by: re (gjb) Sponsored by: Chelsio Communications Modified: head/sys/dev/cxgbe/tom/t4_cpl_io.c Modified: head/sys/dev/cxgbe/tom/t4_cpl_io.c ============================================================================== --- head/sys/dev/cxgbe/tom/t4_cpl_io.c Wed Jun 15 21:01:53 2016 (r301931) +++ head/sys/dev/cxgbe/tom/t4_cpl_io.c Wed Jun 15 21:08:51 2016 (r301932) @@ -577,7 +577,7 @@ t4_push_frames(struct adapter *sc, struc struct tcpcb *tp = intotcpcb(inp); struct socket *so = inp->inp_socket; struct sockbuf *sb = &so->so_snd; - int tx_credits, shove, compl, space, sowwakeup; + int tx_credits, shove, compl, sowwakeup; struct ofld_tx_sdesc *txsd = &toep->txsd[toep->txsd_pidx]; INP_WLOCK_ASSERT(inp); @@ -652,9 +652,7 @@ t4_push_frames(struct adapter *sc, struc } } - space = sbspace(sb); - - if (space <= sb->sb_hiwat * 3 / 8 && + if (sbused(sb) > sb->sb_hiwat * 5 / 8 && toep->plen_nocompl + plen >= sb->sb_hiwat / 4) compl = 1; else @@ -663,7 +661,7 @@ t4_push_frames(struct adapter *sc, struc if (sb->sb_flags & SB_AUTOSIZE && V_tcp_do_autosndbuf && sb->sb_hiwat < V_tcp_autosndbuf_max && - space < sb->sb_hiwat / 8) { + sbused(sb) >= sb->sb_hiwat * 7 / 8) { int newsize = min(sb->sb_hiwat + V_tcp_autosndbuf_inc, V_tcp_autosndbuf_max);
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