From 593f63b0be70762bd4354bde147b8e169c5a2f57 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 23 Nov 2009 01:44:37 +0000 Subject: [PATCH] pktgen: Fix device name compares Commit e6fce5b916cd7f7f7 (pktgen: multiqueue etc.) tried to relax the pktgen restriction of one device per kernel thread, adding a '@' tag to device names. Problem is we dont perform check on full pktgen device name. This allows adding many time same 'device' to pktgen thread pgset "add_device eth0@0" one session later : pgset "add_device eth0@0" (This doesnt find previous device) This consumes ~1.5 MBytes of vmalloc memory per round and also triggers this warning : [ 673.186380] proc_dir_entry 'pktgen/eth0@0' already registered [ 673.186383] Modules linked in: pktgen ixgbe ehci_hcd psmouse mdio mousedev evdev [last unloaded: pktgen] [ 673.186406] Pid: 6219, comm: bash Tainted: G W 2.6.32-rc7-03302-g41cec6f-dirty #16 [ 673.186410] Call Trace: [ 673.186417] [] warn_slowpath_common+0x7b/0xc0 [ 673.186422] [] warn_slowpath_fmt+0x41/0x50 [ 673.186426] [] proc_register+0x109/0x210 [ 673.186433] [] ? apic_timer_interrupt+0xe/0x20 [ 673.186438] [] proc_create_data+0x75/0xd0 [ 673.186444] [] pktgen_thread_write+0x568/0x640 [pktgen] [ 673.186449] [] ? pktgen_thread_write+0x0/0x640 [pktgen] [ 673.186453] [] proc_reg_write+0x84/0xc0 [ 673.186458] [] vfs_write+0xb8/0x180 [ 673.186463] [] sys_write+0x51/0x90 [ 673.186468] [] system_call_fastpath+0x16/0x1b [ 673.186470] ---[ end trace ccbb991b0a8d994d ]--- Solution to this problem is to use a odevname field (includes @ tag and suffix), instead of using netdevice name. Signed-off-by: Eric Dumazet Signed-off-by: Robert Olsson Signed-off-by: David S. Miller --- net/core/pktgen.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 6eb8d47cbf3a..54c634fab6c3 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -363,6 +363,7 @@ struct pktgen_dev { * device name (not when the inject is * started as it used to do.) */ + char odevname[32]; struct flow_state *flows; unsigned cflows; /* Concurrent flows (config) */ unsigned lflow; /* Flow length (config) */ @@ -528,7 +529,7 @@ static int pktgen_if_show(struct seq_file *seq, void *v) seq_printf(seq, " frags: %d delay: %llu clone_skb: %d ifname: %s\n", pkt_dev->nfrags, (unsigned long long) pkt_dev->delay, - pkt_dev->clone_skb, pkt_dev->odev->name); + pkt_dev->clone_skb, pkt_dev->odevname); seq_printf(seq, " flows: %u flowlen: %u\n", pkt_dev->cflows, pkt_dev->lflow); @@ -1688,13 +1689,13 @@ static int pktgen_thread_show(struct seq_file *seq, void *v) if_lock(t); list_for_each_entry(pkt_dev, &t->if_list, list) if (pkt_dev->running) - seq_printf(seq, "%s ", pkt_dev->odev->name); + seq_printf(seq, "%s ", pkt_dev->odevname); seq_printf(seq, "\nStopped: "); list_for_each_entry(pkt_dev, &t->if_list, list) if (!pkt_dev->running) - seq_printf(seq, "%s ", pkt_dev->odev->name); + seq_printf(seq, "%s ", pkt_dev->odevname); if (t->result[0]) seq_printf(seq, "\nResult: %s\n", t->result); @@ -1994,7 +1995,7 @@ static void pktgen_setup_inject(struct pktgen_dev *pkt_dev) "queue_map_min (zero-based) (%d) exceeds valid range " "[0 - %d] for (%d) queues on %s, resetting\n", pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq, - pkt_dev->odev->name); + pkt_dev->odevname); pkt_dev->queue_map_min = ntxq - 1; } if (pkt_dev->queue_map_max >= ntxq) { @@ -2002,7 +2003,7 @@ static void pktgen_setup_inject(struct pktgen_dev *pkt_dev) "queue_map_max (zero-based) (%d) exceeds valid range " "[0 - %d] for (%d) queues on %s, resetting\n", pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq, - pkt_dev->odev->name); + pkt_dev->odevname); pkt_dev->queue_map_max = ntxq - 1; } @@ -3262,7 +3263,7 @@ static int pktgen_stop_device(struct pktgen_dev *pkt_dev) if (!pkt_dev->running) { printk(KERN_WARNING "pktgen: interface: %s is already " - "stopped\n", pkt_dev->odev->name); + "stopped\n", pkt_dev->odevname); return -EINVAL; } @@ -3464,7 +3465,7 @@ static void pktgen_xmit(struct pktgen_dev *pkt_dev) default: /* Drivers are not supposed to return other values! */ if (net_ratelimit()) pr_info("pktgen: %s xmit error: %d\n", - odev->name, ret); + pkt_dev->odevname, ret); pkt_dev->errors++; /* fallthru */ case NETDEV_TX_LOCKED: @@ -3572,7 +3573,7 @@ static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, if_lock(t); list_for_each_entry(p, &t->if_list, list) - if (strncmp(p->odev->name, ifname, IFNAMSIZ) == 0) { + if (strncmp(p->odevname, ifname, IFNAMSIZ) == 0) { pkt_dev = p; break; } @@ -3628,6 +3629,7 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) if (!pkt_dev) return -ENOMEM; + strcpy(pkt_dev->odevname, ifname); pkt_dev->flows = vmalloc(MAX_CFLOWS * sizeof(struct flow_state)); if (pkt_dev->flows == NULL) { kfree(pkt_dev); -- 2.20.1