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Date: Thu, 10 Dec 2020 18:07:42 +0800
From: Libing Zhou <libing.zhou@...ia-sbell.com>
To: davem@...emloft.net, mingo@...hat.com
Cc: libing.zhou@...ia-sbell.com, netdev@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net/netconsole: Support VLAN for netconsole
During kernel startup phase, current netconsole doesn’t support VLAN
since there is no VLAN interface setup already.
This patch provides VLAN ID and PCP as optional boot/module parameters
to support VLAN environment, thus kernel startup log can be retrieved
via VLAN.
Signed-off-by: Libing Zhou <libing.zhou@...ia-sbell.com>
---
Documentation/networking/netconsole.rst | 10 ++++-
drivers/net/netconsole.c | 3 +-
include/linux/netpoll.h | 3 ++
net/core/netpoll.c | 58 ++++++++++++++++++++++++-
4 files changed, 70 insertions(+), 4 deletions(-)
diff --git a/Documentation/networking/netconsole.rst b/Documentation/networking/netconsole.rst
index 1f5c4a04027c..a08387fcc3f0 100644
--- a/Documentation/networking/netconsole.rst
+++ b/Documentation/networking/netconsole.rst
@@ -13,6 +13,8 @@ IPv6 support by Cong Wang <xiyou.wangcong@...il.com>, Jan 1 2013
Extended console support by Tejun Heo <tj@...nel.org>, May 1 2015
+VLAN support by Libing Zhou <libing.zhou@...ia-sbell.com>, Dec 8 2020
+
Please send bug reports to Matt Mackall <mpm@...enic.com>
Satyam Sharma <satyam.sharma@...il.com>, and Cong Wang <xiyou.wangcong@...il.com>
@@ -34,7 +36,7 @@ Sender and receiver configuration:
It takes a string configuration parameter "netconsole" in the
following format::
- netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr]
+ netconsole=[+][src-port]@[src-ip]/[<dev>],[tgt-port]@<tgt-ip>/[tgt-macaddr][-V<vid:pcp>]
where
+ if present, enable extended console support
@@ -44,11 +46,17 @@ following format::
tgt-port port for logging agent (6666)
tgt-ip IP address for logging agent
tgt-macaddr ethernet MAC address for logging agent (broadcast)
+ -V if present, enable VLAN support
+ vid:pcp VLAN identifier and priority code point
Examples::
linux netconsole=4444@...0.0.1/eth1,9353@...0.0.2/12:34:56:78:9a:bc
+or using VLAN::
+
+ linux netconsole=4444@...0.0.1/eth1,9353@...0.0.2/12:34:56:78:9a:bc-V100:1
+
or::
insmod netconsole netconsole=@/,@10.0.0.2/
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 92001f7af380..f0690cd6a744 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -36,7 +36,6 @@
#include <linux/inet.h>
#include <linux/configfs.h>
#include <linux/etherdevice.h>
-
MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@...enic.com>");
MODULE_DESCRIPTION("Console driver for network interfaces");
MODULE_LICENSE("GPL");
@@ -46,7 +45,7 @@ MODULE_LICENSE("GPL");
static char config[MAX_PARAM_LENGTH];
module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);
-MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]");
+MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr][-V<vid:pcp>]");
static bool oops_only = false;
module_param(oops_only, bool, 0600);
diff --git a/include/linux/netpoll.h b/include/linux/netpoll.h
index e6a2d72e0dc7..8ab3f25cadae 100644
--- a/include/linux/netpoll.h
+++ b/include/linux/netpoll.h
@@ -31,6 +31,9 @@ struct netpoll {
bool ipv6;
u16 local_port, remote_port;
u8 remote_mac[ETH_ALEN];
+ bool vlan_present;
+ u16 vlan_id;
+ u8 pcp;
};
struct netpoll_info {
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 2338753e936b..077a7aec51ae 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -478,6 +478,14 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
skb->dev = np->dev;
+ if (np->vlan_present) {
+ skb->vlan_proto = htons(ETH_P_8021Q);
+
+ /* htons for tci is done in __vlan_insert_inner_tag, not here */
+ skb->vlan_tci = (np->pcp << VLAN_PRIO_SHIFT) + (np->vlan_id & VLAN_VID_MASK);
+ skb->vlan_present = 1;
+ }
+
netpoll_send_skb(np, skb);
}
EXPORT_SYMBOL(netpoll_send_udp);
@@ -496,6 +504,11 @@ void netpoll_print_options(struct netpoll *np)
else
np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);
np_info(np, "remote ethernet address %pM\n", np->remote_mac);
+
+ if (np->vlan_present) {
+ np_info(np, "vlan id %d\n", np->vlan_id);
+ np_info(np, "pcp %d\n", np->pcp);
+ }
}
EXPORT_SYMBOL(netpoll_print_options);
@@ -587,10 +600,46 @@ int netpoll_parse_options(struct netpoll *np, char *opt)
if (*cur != 0) {
/* MAC address */
- if (!mac_pton(cur, np->remote_mac))
+ delim = strchr(cur, '-');
+ if (delim)
+ *delim = 0;
+ if (*cur != 0) {
+ if (!mac_pton(cur, np->remote_mac))
+ goto parse_failed;
+ }
+ if (!delim)
+ goto parse_done;
+ }
+
+ cur = delim + 1;
+ if (*cur == 'V') {
+ /* vlan id */
+ cur++;
+ delim = strchr(cur, ':');
+ if (!delim)
+ goto parse_failed;
+ np->vlan_present = 1;
+ *delim = 0;
+ if (kstrtou16(cur, 10, &np->vlan_id))
goto parse_failed;
+ if (np->vlan_id > 4094) {
+ np_info(np, "error: set vlan id: %d is illegal, allowed range 0-4094\n",
+ np->vlan_id);
+ return -1;
+ }
+ cur = delim + 1;
+
+ /* vlan pcp */
+ if (kstrtou8(cur, 10, &np->pcp))
+ goto parse_failed;
+ if (np->pcp > 7) {
+ np_info(np, "error: set pcp value: %d is illegal, allowed range 0-7\n",
+ np->pcp);
+ return -1;
+ }
}
+ parse_done:
netpoll_print_options(np);
return 0;
@@ -671,6 +720,13 @@ int netpoll_setup(struct netpoll *np)
err = -ENODEV;
goto unlock;
}
+ if (is_vlan_dev(ndev) && np->vlan_present) {
+ np_err(np, "%s is vlan interface already, can't support with extra vlan parameter\n",
+ np->dev_name);
+ err = -ENODEV;
+ goto unlock;
+ }
+
dev_hold(ndev);
if (netdev_master_upper_dev_get(ndev)) {
--
2.25.1
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