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Date:      Mon, 7 Jun 2010 08:23:16 +0000 (UTC)
From:      Navdeep Parhar <np@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r208887 - head/sys/dev/cxgb
Message-ID:  <201006070823.o578NGvJ008941@svn.freebsd.org>
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Author: np
Date: Mon Jun  7 08:23:16 2010
New Revision: 208887
URL: http://svn.freebsd.org/changeset/base/208887

Log:
  cxgb(4): add an 'nfilters' tunable that lets the user place an upper
  limit on the number of hardware filters (and thus the amount of TCAM
  reserved for filtering).

Modified:
  head/sys/dev/cxgb/cxgb_main.c

Modified: head/sys/dev/cxgb/cxgb_main.c
==============================================================================
--- head/sys/dev/cxgb/cxgb_main.c	Mon Jun  7 07:41:41 2010	(r208886)
+++ head/sys/dev/cxgb/cxgb_main.c	Mon Jun  7 08:23:16 2010	(r208887)
@@ -238,6 +238,10 @@ TUNABLE_INT("hw.cxgb.snd_queue_len", &cx
 SYSCTL_UINT(_hw_cxgb, OID_AUTO, snd_queue_len, CTLFLAG_RDTUN,
     &cxgb_snd_queue_len, 0, "send queue size ");
 
+static int nfilters = -1;
+TUNABLE_INT("hw.cxgb.nfilters", &nfilters);
+SYSCTL_INT(_hw_cxgb, OID_AUTO, nfilters, CTLFLAG_RDTUN,
+    &nfilters, 0, "max number of entries in the filter table");
 
 enum {
 	MAX_TXQ_ENTRIES      = 16384,
@@ -1652,6 +1656,7 @@ static int
 cxgb_up(struct adapter *sc)
 {
 	int err = 0;
+	unsigned int mxf = t3_mc5_size(&sc->mc5) - MC5_MIN_TIDS;
 
 	KASSERT(sc->open_device_map == 0, ("%s: device(s) already open (%x)",
 					   __func__, sc->open_device_map));
@@ -1668,11 +1673,13 @@ cxgb_up(struct adapter *sc)
 			if ((err = update_tpsram(sc)))
 				goto out;
 
-		if (is_offload(sc)) {
+		if (is_offload(sc) && nfilters != 0) {
 			sc->params.mc5.nservers = 0;
-			sc->params.mc5.nroutes = 0;
-			sc->params.mc5.nfilters = t3_mc5_size(&sc->mc5) -
-			    MC5_MIN_TIDS;
+
+			if (nfilters < 0)
+				sc->params.mc5.nfilters = mxf;
+			else
+				sc->params.mc5.nfilters = min(nfilters, mxf);
 		}
 
 		err = t3_init_hw(sc, 0);

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