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Date: Wed, 18 Apr 2007 21:12:54 +0900 From: Keiichi KII <k-keiichi@...jp.nec.com> To: mpm@...enic.com CC: davem@...emloft.net, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: [RFC][PATCH -mm take4 5/6] switch function of netpoll From: Keiichi KII <k-keiichi@...jp.nec.com> This patch contains switch function of netpoll. If "enabled" attribute of certain port is '1', this port is used and the configurations of this port are uable to change. If "enabled" attribute of certain port is '0', this port isn't used and the configurations of this port are able to change. -+- /sys/class/misc/ |-+- netconsole/ |-+- port1/ | |--- id [r--r--r--] id | |--- enabled [rw-r--r--] 0: disable 1: enable, writable | ... |--- port2/ ... Signed-off-by: Keiichi KII <k-keiichi@...jp.nec.com> Signed-off-by: Takayoshi Kochi <t-kochi@...jp.nec.com> --- Index: mm/drivers/net/netconsole.c =================================================================== --- mm.orig/drivers/net/netconsole.c +++ mm/drivers/net/netconsole.c @@ -71,6 +71,7 @@ struct netconsole_target { struct list_head list; struct kobject obj; int id; + int enabled; struct netpoll np; }; @@ -128,10 +129,19 @@ static ssize_t show_remote_mac(struct ne nt->np.remote_mac[4], nt->np.remote_mac[5]); } +static ssize_t show_enabled(struct netconsole_target *nt, char *buf) +{ + return sprintf(buf, "%d\n", nt->enabled); +} + static ssize_t store_local_port(struct netconsole_target *nt, const char *buf, size_t count) { spin_lock(&target_list_lock); + if (nt->enabled) { + spin_unlock(&target_list_lock); + return -EINVAL; + } nt->np.local_port = simple_strtol(buf, NULL, 10); spin_unlock(&target_list_lock); @@ -142,6 +152,10 @@ static ssize_t store_remote_port(struct size_t count) { spin_lock(&target_list_lock); + if (nt->enabled) { + spin_unlock(&target_list_lock); + return -EINVAL; + } nt->np.remote_port = simple_strtol(buf, NULL, 10); spin_unlock(&target_list_lock); @@ -152,6 +166,10 @@ static ssize_t store_local_ip(struct net size_t count) { spin_lock(&target_list_lock); + if (nt->enabled) { + spin_unlock(&target_list_lock); + return -EINVAL; + } nt->np.local_ip = ntohl(in_aton(buf)); spin_unlock(&target_list_lock); @@ -162,6 +180,10 @@ static ssize_t store_remote_ip(struct ne size_t count) { spin_lock(&target_list_lock); + if (nt->enabled) { + spin_unlock(&target_list_lock); + return -EINVAL; + } nt->np.remote_ip = ntohl(in_aton(buf)); spin_unlock(&target_list_lock); @@ -184,12 +206,39 @@ static ssize_t store_remote_mac(struct n if (i != ETH_ALEN) return -EINVAL; spin_lock(&target_list_lock); + if (nt->enabled) { + spin_unlock(&target_list_lock); + return -EINVAL; + } memcpy(nt->np.remote_mac, input_mac, ETH_ALEN); spin_unlock(&target_list_lock); return count; } +static ssize_t store_enabled(struct netconsole_target *nt, const char *buf, + size_t count) +{ + int enabled = 0; + + if (count >= 2 && (count != 2 || buf[count - 1] != '\n')) { + printk(KERN_ERR "netconsole: invalid argument: %s\n", buf); + return -EINVAL; + } else if (buf[0] == '1') { + enabled = 1; + } else if(buf[0] == '0') { + enabled = 0; + } else { + printk(KERN_ERR "netconsole: invalid argument: %s\n", buf); + return -EINVAL; + } + spin_lock(&target_list_lock); + nt->enabled = enabled; + spin_unlock(&target_list_lock); + + return count; +} + struct target_attr { struct attribute attr; ssize_t (*show)(struct netconsole_target*, char*); @@ -213,6 +262,8 @@ static NETCON_CLASS_ATTR(remote_ip, S_IR static NETCON_CLASS_ATTR(local_mac, S_IRUGO, show_local_mac, NULL); static NETCON_CLASS_ATTR(remote_mac, S_IRUGO | S_IWUSR, show_remote_mac, store_remote_mac); +static NETCON_CLASS_ATTR(enabled, S_IRUGO | S_IWUSR, + show_enabled, store_enabled); static struct attribute *target_attrs[] = { &target_attr_id.attr, @@ -222,6 +273,7 @@ static struct attribute *target_attrs[] &target_attr_remote_ip.attr, &target_attr_local_mac.attr, &target_attr_remote_mac.attr, + &target_attr_enabled.attr, NULL }; @@ -380,6 +432,7 @@ static int add_target(char* target_confi } new_target->id = atomic_inc_return(&target_count); + new_target->enabled = 1; printk(KERN_INFO "netconsole: add target: " "remote ip_addr=%d.%d.%d.%d remote port=%d\n", @@ -421,7 +474,8 @@ static void write_msg(struct console *co for(left = len; left; ) { frag = min(left, MAX_PRINT_CHUNK); list_for_each_entry(target, &target_list, list) { - netpoll_send_udp(&target->np, msg, frag); + if (target->enabled) + netpoll_send_udp(&target->np, msg, frag); } msg += frag; left -= frag; -- - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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