pktgen: Fix device name compares

PATCH Applied Eric Dumazet 3 participants 8 messages Nov 23, 2009 – Nov 24, 2009

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Eric Dumazet

author

2009-11-23 11:44 UTC #0 lore raw

PATCH 1/1 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]  [<ffffffff8104a29b>] warn_slowpath_common+0x7b/0xc0
[  673.186422]  [<ffffffff8104a341>] warn_slowpath_fmt+0x41/0x50
[  673.186426]  [<ffffffff8114e789>] proc_register+0x109/0x210
[  673.186433]  [<ffffffff8100bf2e>] ? apic_timer_interrupt+0xe/0x20
[  673.186438]  [<ffffffff8114e905>] proc_create_data+0x75/0xd0
[  673.186444]  [<ffffffffa006ad38>] pktgen_thread_write+0x568/0x640 [pktgen]
[  673.186449]  [<ffffffffa006a7d0>] ? pktgen_thread_write+0x0/0x640 [pktgen]
[  673.186453]  [<ffffffff81149144>] proc_reg_write+0x84/0xc0
[  673.186458]  [<ffffffff810f5a58>] vfs_write+0xb8/0x180
[  673.186463]  [<ffffffff810f5c11>] sys_write+0x51/0x90
[  673.186468]  [<ffffffff8100b51b>] 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 <[email protected]>

---
 net/core/pktgen.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

net/core/pktgen.c +10 -8

index d38470a..1813f08 100644
@@ -364,6 +364,7 @@ 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) */

@@ -529,7 +530,7 @@ 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);

@@ -1689,13 +1690,13 @@ 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);

@@ -1995,7 +1996,7 @@ 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) {

@@ -2003,7 +2004,7 @@ 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;
 	}

@@ -3263,7 +3264,7 @@ 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;
 	}

@@ -3467,7 +3468,7 @@ 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:

@@ -3576,7 +3577,7 @@ 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;
 		}

@@ -3632,6 +3633,7 @@ 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);

[email protected]

2009-11-23 12:41 UTC #1 lore raw

PATCH 1/1 pktgen: Fix device name compares

Quoted 11 lines · Eric Dumazet

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 :

Quoted 8 lines

pgset "add_device eth0@0"
(This doesnt find previous device)
Solution to this problem is to use a odevname field (includes @ tag and suffix), instead of using netdevice name.

Ok. So the duplicate test got wrong when the multiqueue stuff was added.

Signed-off-by Robert Olsson <[email protected]>

Cheers

					--ro

Quoted 95 lines

Signed-off-by Eric Dumazet <[email protected]>

---
 net/core/pktgen.c |   18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

net/core/pktgen.c +10 -8

index d38470a..1813f08 100644
@@ -364,6 +364,7 @@ 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) */

@@ -529,7 +530,7 @@ 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);

@@ -1689,13 +1690,13 @@ 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);

@@ -1995,7 +1996,7 @@ 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) {

@@ -2003,7 +2004,7 @@ 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;
 	}

@@ -3263,7 +3264,7 @@ 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;
 	}

@@ -3467,7 +3468,7 @@ 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:

@@ -3576,7 +3577,7 @@ 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;
 		}

@@ -3632,6 +3633,7 @@ 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);

Eric Dumazet

author

2009-11-23 15:22 UTC #2 lore raw

Quoted 6 lines · [email protected] a écrit :

Ok. So the duplicate test got wrong when the multiqueue stuff was added.
Signed-off-by Robert Olsson <[email protected]>
Cheers

Thanks Robert

Here is an updated version because the netdev unregister event also needed some changes.

[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]  [<ffffffff8104a29b>] warn_slowpath_common+0x7b/0xc0
[  673.186422]  [<ffffffff8104a341>] warn_slowpath_fmt+0x41/0x50
[  673.186426]  [<ffffffff8114e789>] proc_register+0x109/0x210
[  673.186433]  [<ffffffff8100bf2e>] ? apic_timer_interrupt+0xe/0x20
[  673.186438]  [<ffffffff8114e905>] proc_create_data+0x75/0xd0
[  673.186444]  [<ffffffffa006ad38>] pktgen_thread_write+0x568/0x640 [pktgen]
[  673.186449]  [<ffffffffa006a7d0>] ? pktgen_thread_write+0x0/0x640 [pktgen]
[  673.186453]  [<ffffffff81149144>] proc_reg_write+0x84/0xc0
[  673.186458]  [<ffffffff810f5a58>] vfs_write+0xb8/0x180
[  673.186463]  [<ffffffff810f5c11>] sys_write+0x51/0x90
[  673.186468]  [<ffffffff8100b51b>] 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.

This also permits clean unloading of NIC drivers.

Signed-off-by Eric Dumazet <[email protected]>

---
 net/core/pktgen.c |   30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

net/core/pktgen.c +19 ~~-11~~

index d38470a..e23f494 100644
@@ -364,6 +364,7 @@ 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) */

@@ -427,7 +428,7 @@ static const char version[] =
 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
-					  const char *ifname);
+					  const char *ifname, bool exact);
 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
 static void pktgen_run_all_threads(void);
 static void pktgen_reset_all_threads(void);

@@ -529,7 +530,7 @@ 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);

@@ -1689,13 +1690,13 @@ 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);

@@ -1818,9 +1819,10 @@ static struct pktgen_dev *__pktgen_NN_threads(const char *ifname, int remove)
 {
 	struct pktgen_thread *t;
 	struct pktgen_dev *pkt_dev = NULL;
+	bool exact = (remove == FIND);
 
 	list_for_each_entry(t, &pktgen_threads, th_list) {
-		pkt_dev = pktgen_find_dev(t, ifname);
+		pkt_dev = pktgen_find_dev(t, ifname, exact);
 		if (pkt_dev) {
 			if (remove) {
 				if_lock(t);

@@ -1995,7 +1997,7 @@ 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) {

@@ -2003,7 +2005,7 @@ 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;
 	}

@@ -3263,7 +3265,7 @@ 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;
 	}

@@ -3467,7 +3469,7 @@ 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:

@@ -3570,13 +3572,18 @@ static int pktgen_thread_worker(void *arg)
 }
 
 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
-					  const char *ifname)
+					  const char *ifname, bool exact)
 {
 	struct pktgen_dev *p, *pkt_dev = NULL;
+	size_t len = strlen(ifname);
 	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, len) == 0) {
+			if (p->odevname[len]) {
+				if (exact || p->odevname[len] != '@')
+					continue;
+			}
 			pkt_dev = p;
 			break;
 		}

@@ -3632,6 +3639,7 @@ 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);

David Miller

maintainer

2009-11-24 20:21 UTC #3 lore raw

From: Eric Dumazet <[email protected]>
Date: Mon, 23 Nov 2009 16:22:49 +0100

Quoted 1 line

Here is an updated version because the netdev unregister event also needed some changes.

...

Quoted 1 line

[PATCH] pktgen: Fix device name compares

Eric, I put the original version of your patch into net-next-2.6 and pushed it out already the other day. Can you give me something relative with these updates in it?

Thanks.

Eric Dumazet

author

2009-11-24 20:24 UTC #4 lore raw

Quoted 4 lines · David Miller

Eric, I put the original version of your patch into net-next-2.6 and pushed it out already the other day. Can you give me something relative with these updates in it?

Sure, I was aware of the possible mismatch, and was waiting for the tree push, dont worry :)

Eric Dumazet

author

2009-11-24 21:15 UTC #5 lore raw

In reply to David Miller

Quoted 5 lines · David Miller

Eric, I put the original version of your patch into net-next-2.6 and pushed it out already the other day. Can you give me something relative with these updates in it?

Here is the relative patch against net-2.6

Thanks

[PATCH] pktgen: Fix netdevice unregister

When multi queue compatable names are used by pktgen (eg eth0@0), we currently cannot unload a NIC driver if one of its device is currently in use.

Allow pktgen_find_dev() to find pktgen devices by their suffix (netdev name)

Signed-off-by Eric Dumazet <[email protected]>

---
 net/core/pktgen.c |   16 +++++++++++-----
 1 files changed, 11 insertions(+), 5 deletions(-)

net/core/pktgen.c +11 -5

index 54c634f..6e79e96 100644
@@ -427,7 +427,7 @@ static const char version[] =
 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
-					  const char *ifname);
+					  const char *ifname, bool exact);
 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
 static void pktgen_run_all_threads(void);
 static void pktgen_reset_all_threads(void);

@@ -1818,9 +1818,10 @@ static struct pktgen_dev *__pktgen_NN_threads(const char *ifname, int remove)
 {
 	struct pktgen_thread *t;
 	struct pktgen_dev *pkt_dev = NULL;
+	bool exact = (remove == FIND);
 
 	list_for_each_entry(t, &pktgen_threads, th_list) {
-		pkt_dev = pktgen_find_dev(t, ifname);
+		pkt_dev = pktgen_find_dev(t, ifname, exact);
 		if (pkt_dev) {
 			if (remove) {
 				if_lock(t);

@@ -3567,13 +3568,18 @@ static int pktgen_thread_worker(void *arg)
 }
 
 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
-					  const char *ifname)
+					  const char *ifname, bool exact)
 {
 	struct pktgen_dev *p, *pkt_dev = NULL;
-	if_lock(t);
+	size_t len = strlen(ifname);
 
+	if_lock(t);
 	list_for_each_entry(p, &t->if_list, list)
-		if (strncmp(p->odevname, ifname, IFNAMSIZ) == 0) {
+		if (strncmp(p->odevname, ifname, len) == 0) {
+			if (p->odevname[len]) {
+				if (exact || p->odevname[len] != '@')
+					continue;
+			}
 			pkt_dev = p;
 			break;
 		}

David Miller

maintainer Applied

2009-11-24 22:50 UTC #6 lore raw

From: Eric Dumazet <[email protected]>
Date: Tue, 24 Nov 2009 22:15:31 +0100

Quoted 9 lines

[PATCH] pktgen: Fix netdevice unregister
When multi queue compatable names are used by pktgen (eg eth0@0), we currently cannot unload a NIC driver if one of its device is currently in use.
Allow pktgen_find_dev() to find pktgen devices by their suffix (netdev name)
Signed-off-by Eric Dumazet <[email protected]>

Applied, thanks Eric.

David Miller

maintainer Applied

2009-11-23 18:38 UTC #7 lore raw

In reply to Eric Dumazet

From: Eric Dumazet <[email protected]>
Date: Mon, 23 Nov 2009 12:44:37 +0100

Quoted 5 lines

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.

...

Quoted 4 lines

Solution to this problem is to use a odevname field (includes @ tag and suffix), instead of using netdevice name.
Signed-off-by Eric Dumazet <[email protected]>

Applied, thanks Eric.