Merge upstream ethtool 5.3

This merges upstream commit 76c46821fc0e171de6908e0421bb2f032a6eb857
which is ethtool/v5.3^{commit}

(or would be if the tag existed, sent an email to John Linville about that oversight)

See:
  https://git.kernel.org/pub/scm/network/ethtool/ethtool.git/commit/?id=76c46821fc0e171de6908e0421bb2f032a6eb857

Release version 5.3.
Signed-off-by: John W. Linville <linville@tuxdriver.com>

aosp/external/ethtool$ git merge 76c46821fc0e171de6908e0421bb2f032a6eb857
Merge made by the 'recursive' strategy.
 .gitignore   |  3 +++
 NEWS         |  4 ++++
 configure.ac |  2 +-
 ethtool.8.in |  2 +-
 ethtool.c    | 13 +++++++++++--
 igb.c        | 12 ++++++++++++
 6 files changed, 32 insertions(+), 4 deletions(-)

aosp/external/ethtool$ git diff --stat 76c46821fc0e171de6908e0421bb2f032a6eb857
 Android.bp | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 OWNERS     |  1 +
 2 files changed, 47 insertions(+)

Test: builds, Android.bp version number fixups in follow up
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ib82925376ae821ebebe4660246ae946cc9958873

6 files changed, 32 insertions, 4 deletions

diff --git a/.gitignore b/.gitignore
index f1165a2..c4df588 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,6 @@ autom4te.cache
 .deps
 test-*.log
 test-*.trs
+
+.*.swp
+*.patch
diff --git a/NEWS b/NEWS
index 6b2248f..70f2396 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+Version 5.3 - September 23, 2019
+	* Feature: igb: dump RR2DCDELAY register
+	* Feature: dump nested registers
+
 Version 5.2 - July 25, 2019
 	* Feature: Add 100BaseT1 and 1000BaseT1 link modes
 	* Feature: Use standard file location macros in ethtool.spec
diff --git a/configure.ac b/configure.ac
index 2127fdb..56e4683 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_INIT(ethtool, 5.2, netdev@vger.kernel.org)
+AC_INIT(ethtool, 5.3, netdev@vger.kernel.org)
 AC_PREREQ(2.52)
 AC_CONFIG_SRCDIR([ethtool.c])
 AM_INIT_AUTOMAKE([gnu])
diff --git a/ethtool.8.in b/ethtool.8.in
index cd3be91..22472e1 100644
--- a/ethtool.8.in
+++ b/ethtool.8.in
@@ -113,7 +113,7 @@
 .  hy \\n(HY
 ..
 .
-.TH ETHTOOL 8 "July 2019" "Ethtool version @VERSION@"
+.TH ETHTOOL 8 "September 2019" "Ethtool version @VERSION@"
 .SH NAME
 ethtool \- query or control network driver and hardware settings
 .
diff --git a/ethtool.c b/ethtool.c
index 05fe05a..c0e2903 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -1245,7 +1245,7 @@ static int dump_regs(int gregs_dump_raw, int gregs_dump_hex,
 
 	if (gregs_dump_raw) {
 		fwrite(regs->data, regs->len, 1, stdout);
-		return 0;
+		goto nested;
 	}
 
 	if (!gregs_dump_hex)
@@ -1253,7 +1253,7 @@ static int dump_regs(int gregs_dump_raw, int gregs_dump_hex,
 			if (!strncmp(driver_list[i].name, info->driver,
 				     ETHTOOL_BUSINFO_LEN)) {
 				if (driver_list[i].func(info, regs) == 0)
-					return 0;
+					goto nested;
 				/* This version (or some other
 				 * variation in the dump format) is
 				 * not handled; fall back to hex
@@ -1263,6 +1263,15 @@ static int dump_regs(int gregs_dump_raw, int gregs_dump_hex,
 
 	dump_hex(stdout, regs->data, regs->len, 0);
 
+nested:
+	/* Recurse dump if some drvinfo and regs structures are nested */
+	if (info->regdump_len > regs->len + sizeof(*info) + sizeof(*regs)) {
+		info = (struct ethtool_drvinfo *)(&regs->data[0] + regs->len);
+		regs = (struct ethtool_regs *)(&regs->data[0] + regs->len + sizeof(*info));
+
+		return dump_regs(gregs_dump_raw, gregs_dump_hex, info, regs);
+	}
+
 	return 0;
 }
 
diff --git a/igb.c b/igb.c
index e0ccef9..cb24877 100644
--- a/igb.c
+++ b/igb.c
@@ -859,6 +859,18 @@ igb_dump_regs(struct ethtool_drvinfo *info, struct ethtool_regs *regs)
 		"0x03430: TDFPC       (Tx data FIFO packet count)      0x%08X\n",
 		regs_buff[550]);
 
+	/*
+	 * Starting from kernel version 5.3 the registers dump buffer grew from
+	 * 739 4-byte words to 740 words, and word 740 contains the RR2DCDELAY
+	 * register.
+	 */
+	if (regs->len < 740)
+		return 0;
+
+	fprintf(stdout,
+		"0x05BF4: RR2DCDELAY  (Max. DMA read delay)            0x%08X\n",
+		regs_buff[739]);
+
 	return 0;
 }