svn commit: r337550 - in head: share/man/man4 sys/dev/cxgbe

[Navdeep Parhar]

Author: np
Date: Thu Aug  9 21:07:32 2018
New Revision: 337550
URL: https://svnweb.freebsd.org/changeset/base/337550

Log:
  cxgbe(4): Set fl_pktshift to 0 by default.
  
  Sponsored by:	Chelsio Communications

Modified:
  head/share/man/man4/cxgbe.4
  head/sys/dev/cxgbe/t4_sge.c

Modified: head/share/man/man4/cxgbe.4
==============================================================================
--- head/share/man/man4/cxgbe.4	Thu Aug  9 20:29:44 2018	(r337549)
+++ head/share/man/man4/cxgbe.4	Thu Aug  9 21:07:32 2018	(r337550)
@@ -31,7 +31,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 16, 2017
+.Dd Aug 9, 2018
 .Dt CXGBE 4
 .Os
 .Sh NAME
@@ -262,7 +262,8 @@ The default is 1.
 .It Va hw.cxgbe.fl_pktshift
 Number of padding bytes inserted before the beginning of an Ethernet
 frame in the receive buffer.
-The default value of 2 ensures that the Ethernet payload (usually the IP header)
+The default value is 0.
+A value of of 2 would ensure that the Ethernet payload (usually the IP header)
 is at a 4 byte aligned address.
 0-7 are all valid values.
 .It Va hw.cxgbe.fl_pad

Modified: head/sys/dev/cxgbe/t4_sge.c
==============================================================================
--- head/sys/dev/cxgbe/t4_sge.c	Thu Aug  9 20:29:44 2018	(r337549)
+++ head/sys/dev/cxgbe/t4_sge.c	Thu Aug  9 21:07:32 2018	(r337550)
@@ -86,7 +86,7 @@ __FBSDID("$FreeBSD$");
  * Ethernet frames are DMA'd at this byte offset into the freelist buffer.
  * 0-7 are valid values.
  */
-static int fl_pktshift = 2;
+static int fl_pktshift = 0;
 TUNABLE_INT("hw.cxgbe.fl_pktshift", &fl_pktshift);
 
 /*
@@ -496,8 +496,8 @@ t4_sge_modload(void)
 
 	if (fl_pktshift < 0 || fl_pktshift > 7) {
 		printf("Invalid hw.cxgbe.fl_pktshift value (%d),"
-		    " using 2 instead.\n", fl_pktshift);
-		fl_pktshift = 2;
+		    " using 0 instead.\n", fl_pktshift);
+		fl_pktshift = 0;
 	}
 
 	if (spg_len != 64 && spg_len != 128) {