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Date: Wed, 4 Mar 2020 21:26:41 +0100 (CET)
From: Michal Kubecek <mkubecek@...e.cz>
To: John Linville <linville@...driver.com>, netdev@...r.kernel.org
Cc: Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH ethtool v2 25/25] netlink: use pretty printing for ethtool
netlink messages
Introduce new debugging flag DEBUG_NL_PRETTY_MSG (0x10) which has two
effects:
- show request messages embedded in extack error messages in human
readable form; if failing attribute offset is provided, highlight the
attribute
- if DEBUG_NL_MSGS is also set, show structure of all outgoing and
incoming ethtool netlink messages in addition to their summary
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
internal.h | 1 +
netlink/nlsock.c | 71 +++++++++++++++++++++++++++++++++++++-----------
2 files changed, 56 insertions(+), 16 deletions(-)
diff --git a/internal.h b/internal.h
index a518bfa99380..edb07bddd073 100644
--- a/internal.h
+++ b/internal.h
@@ -122,6 +122,7 @@ enum {
DEBUG_NL_MSGS, /* incoming/outgoing netlink messages */
DEBUG_NL_DUMP_SND, /* dump outgoing netlink messages */
DEBUG_NL_DUMP_RCV, /* dump incoming netlink messages */
+ DEBUG_NL_PRETTY_MSG, /* pretty print of messages and errors */
};
static inline bool debug_on(unsigned long debug, unsigned int bit)
diff --git a/netlink/nlsock.c b/netlink/nlsock.c
index 4366c52ce390..22abb68b6646 100644
--- a/netlink/nlsock.c
+++ b/netlink/nlsock.c
@@ -10,6 +10,7 @@
#include "../internal.h"
#include "nlsock.h"
#include "netlink.h"
+#include "prettymsg.h"
#define NLSOCK_RECV_BUFFSIZE 65536
@@ -43,10 +44,12 @@ static void ctrl_msg_summary(const struct nlmsghdr *nlhdr)
}
static void genl_msg_summary(const struct nlmsghdr *nlhdr, int ethnl_fam,
- bool outgoing)
+ bool outgoing, bool pretty)
{
if (nlhdr->nlmsg_type == ethnl_fam) {
+ const struct pretty_nlmsg_desc *msg_desc;
const struct genlmsghdr *ghdr;
+ unsigned int n_desc;
printf(" ethool");
if (nlhdr->nlmsg_len < NLMSG_HDRLEN + GENL_HDRLEN) {
@@ -55,27 +58,46 @@ static void genl_msg_summary(const struct nlmsghdr *nlhdr, int ethnl_fam,
}
ghdr = mnl_nlmsg_get_payload(nlhdr);
- printf(" cmd %u", ghdr->cmd);
+ msg_desc = outgoing ? ethnl_umsg_desc : ethnl_kmsg_desc;
+ n_desc = outgoing ? ethnl_umsg_n_desc : ethnl_kmsg_n_desc;
+ if (ghdr->cmd < n_desc && msg_desc[ghdr->cmd].name)
+ printf(" %s", msg_desc[ghdr->cmd].name);
+ else
+ printf(" cmd %u", ghdr->cmd);
fputc('\n', stdout);
+ if (pretty)
+ pretty_print_genlmsg(nlhdr, msg_desc, n_desc, 0);
return;
}
- if (nlhdr->nlmsg_type == GENL_ID_CTRL)
+ if (nlhdr->nlmsg_type == GENL_ID_CTRL) {
printf(" genl-ctrl\n");
- else
+ if (pretty)
+ pretty_print_genlmsg(nlhdr, genlctrl_msg_desc,
+ genlctrl_msg_n_desc, 0);
+ } else {
fputc('\n', stdout);
+ if (pretty)
+ pretty_print_genlmsg(nlhdr, NULL, 0, 0);
+ }
}
-static void rtnl_msg_summary(const struct nlmsghdr *nlhdr)
+static void rtnl_msg_summary(const struct nlmsghdr *nlhdr, bool pretty)
{
unsigned int type = nlhdr->nlmsg_type;
- printf(" type %u\n", type);
+ if (type < rtnl_msg_n_desc && rtnl_msg_desc[type].name)
+ printf(" %s\n", rtnl_msg_desc[type].name);
+ else
+ printf(" type %u\n", type);
+
+ if (pretty)
+ pretty_print_rtnlmsg(nlhdr, 0);
}
static void debug_msg_summary(const struct nlmsghdr *nlhdr, int ethnl_fam,
- int nl_fam, bool outgoing)
+ int nl_fam, bool outgoing, bool pretty)
{
printf(" msg length %u", nlhdr->nlmsg_len);
@@ -86,10 +108,10 @@ static void debug_msg_summary(const struct nlmsghdr *nlhdr, int ethnl_fam,
switch(nl_fam) {
case NETLINK_GENERIC:
- genl_msg_summary(nlhdr, ethnl_fam, outgoing);
+ genl_msg_summary(nlhdr, ethnl_fam, outgoing, pretty);
break;
case NETLINK_ROUTE:
- rtnl_msg_summary(nlhdr);
+ rtnl_msg_summary(nlhdr, pretty);
break;
default:
fputc('\n', stdout);
@@ -103,13 +125,14 @@ static void debug_msg(struct nl_socket *nlsk, const void *msg, unsigned int len,
const char *dirlabel = outgoing ? "sending" : "received";
uint32_t debug = nlsk->nlctx->ctx->debug;
const struct nlmsghdr *nlhdr = msg;
- bool summary, dump;
+ bool summary, dump, pretty;
const char *nl_fam_label;
int left = len;
summary = debug_on(debug, DEBUG_NL_MSGS);
dump = debug_on(debug,
outgoing ? DEBUG_NL_DUMP_SND : DEBUG_NL_DUMP_RCV);
+ pretty = debug_on(debug, DEBUG_NL_PRETTY_MSG);
if (!summary && !dump)
return;
switch(nlsk->nl_fam) {
@@ -128,7 +151,7 @@ static void debug_msg(struct nl_socket *nlsk, const void *msg, unsigned int len,
while (nlhdr && left > 0 && mnl_nlmsg_ok(nlhdr, left)) {
if (summary)
debug_msg_summary(nlhdr, nlsk->nlctx->ethnl_fam,
- nlsk->nl_fam, outgoing);
+ nlsk->nl_fam, outgoing, pretty);
if (dump)
mnl_nlmsg_fprintf(stdout, nlhdr, nlhdr->nlmsg_len,
GENL_HDRLEN);
@@ -146,7 +169,7 @@ static void debug_msg(struct nl_socket *nlsk, const void *msg, unsigned int len,
* Return: error code extracted from the message
*/
static int nlsock_process_ack(struct nlmsghdr *nlhdr, ssize_t len,
- unsigned int suppress_nlerr)
+ unsigned int suppress_nlerr, bool pretty)
{
const struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(tb);
@@ -174,12 +197,23 @@ static int nlsock_process_ack(struct nlmsghdr *nlhdr, ssize_t len,
fprintf(stderr, "netlink %s: %s",
nlerr->error ? "error" : "warning", msg);
- if (tb[NLMSGERR_ATTR_OFFS])
+ if (!pretty && tb[NLMSGERR_ATTR_OFFS])
fprintf(stderr, " (offset %u)",
mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]));
fputc('\n', stderr);
}
+ if (nlerr->error && pretty) {
+ unsigned int err_offset = 0;
+
+ if (tb[NLMSGERR_ATTR_OFFS])
+ err_offset = mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]);
+ fprintf(stderr, "offending message%s:\n",
+ err_offset ? " and attribute" : "");
+ pretty_print_genlmsg(&nlerr->msg, ethnl_umsg_desc,
+ ethnl_umsg_n_desc, err_offset);
+ }
+
out:
if (nlerr->error) {
errno = -nlerr->error;
@@ -223,9 +257,14 @@ int nlsock_process_reply(struct nl_socket *nlsk, mnl_cb_t reply_cb, void *data)
return -EFAULT;
nlhdr = (struct nlmsghdr *)buff;
- if (nlhdr->nlmsg_type == NLMSG_ERROR)
- return nlsock_process_ack(nlhdr, len,
- nlsk->nlctx->suppress_nlerr);
+ if (nlhdr->nlmsg_type == NLMSG_ERROR) {
+ bool silent = nlsk->nlctx->suppress_nlerr;
+ bool pretty;
+
+ pretty = debug_on(nlsk->nlctx->ctx->debug,
+ DEBUG_NL_PRETTY_MSG);
+ return nlsock_process_ack(nlhdr, len, silent, pretty);
+ }
msgbuff->nlhdr = nlhdr;
msgbuff->genlhdr = mnl_nlmsg_get_payload(nlhdr);
--
2.25.1
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