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net: embed nr_ids in the xps maps

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Embed nr_ids (the number of cpu for the xps cpus map, and the number of
rxqs for the xps cpus map) in dev_maps. That will help not accessing out
of bound memory if those values change after dev_maps was allocated.

Suggested-by: Alexander Duyck <alexander.duyck@gmail.com>
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Antoine Tenart
2021-03-18 19:37:44 +01:00
committed by David S. Miller
parent 255c04a87f
commit 5478fcd0f4
3 changed files with 51 additions and 44 deletions
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45
net/core/dev.c
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@ -2524,14 +2524,14 @@ static void reset_xps_maps(struct net_device *dev,
}
static void clean_xps_maps(struct net_device *dev, const unsigned long *mask,
struct xps_dev_maps *dev_maps, unsigned int nr_ids,
u16 offset, u16 count, bool is_rxqs_map)
struct xps_dev_maps *dev_maps, u16 offset, u16 count,
bool is_rxqs_map)
{
unsigned int nr_ids = dev_maps->nr_ids;
bool active = false;
int i, j;
for (j = -1; j = netif_attrmask_next(j, mask, nr_ids),
j < nr_ids;)
for (j = -1; j = netif_attrmask_next(j, mask, nr_ids), j < nr_ids;)
active |= remove_xps_queue_cpu(dev, dev_maps, j, offset,
count);
if (!active)
@ -2551,7 +2551,6 @@ static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
{
const unsigned long *possible_mask = NULL;
struct xps_dev_maps *dev_maps;
unsigned int nr_ids;
if (!static_key_false(&xps_needed))
return;
@ -2561,11 +2560,9 @@ static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
if (static_key_false(&xps_rxqs_needed)) {
dev_maps = xmap_dereference(dev->xps_rxqs_map);
if (dev_maps) {
nr_ids = dev->num_rx_queues;
clean_xps_maps(dev, possible_mask, dev_maps, nr_ids,
offset, count, true);
}
if (dev_maps)
clean_xps_maps(dev, possible_mask, dev_maps, offset,
count, true);
}
dev_maps = xmap_dereference(dev->xps_cpus_map);
@ -2574,9 +2571,7 @@ static void netif_reset_xps_queues(struct net_device *dev, u16 offset,
if (num_possible_cpus() > 1)
possible_mask = cpumask_bits(cpu_possible_mask);
nr_ids = nr_cpu_ids;
clean_xps_maps(dev, possible_mask, dev_maps, nr_ids, offset, count,
false);
clean_xps_maps(dev, possible_mask, dev_maps, offset, count, false);
out_no_maps:
mutex_unlock(&xps_map_mutex);
@ -2673,11 +2668,12 @@ int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
maps_sz = L1_CACHE_BYTES;
/* The old dev_maps could be larger or smaller than the one we're
* setting up now, as dev->num_tc could have been updated in between. We
* could try to be smart, but let's be safe instead and only copy
* foreign traffic classes if the two map sizes match.
* setting up now, as dev->num_tc or nr_ids could have been updated in
* between. We could try to be smart, but let's be safe instead and only
* copy foreign traffic classes if the two map sizes match.
*/
if (dev_maps && dev_maps->num_tc == num_tc)
if (dev_maps &&
dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids)
copy = true;
/* allocate memory for queue storage */
@ -2690,6 +2686,7 @@ int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
return -ENOMEM;
}
new_dev_maps->nr_ids = nr_ids;
new_dev_maps->num_tc = num_tc;
}
@ -2770,7 +2767,7 @@ int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
goto out_no_old_maps;
for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
j < nr_ids;) {
j < dev_maps->nr_ids;) {
for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) {
map = xmap_dereference(dev_maps->attr_map[tci]);
if (!map)
@ -2804,12 +2801,12 @@ out_no_new_maps:
goto out_no_maps;
/* removes tx-queue from unused CPUs/rx-queues */
for (j = -1; j = netif_attrmask_next(j, possible_mask, nr_ids),
j < nr_ids;) {
for (j = -1; j = netif_attrmask_next(j, possible_mask, dev_maps->nr_ids),
j < dev_maps->nr_ids;) {
for (i = tc, tci = j * dev_maps->num_tc; i--; tci++)
active |= remove_xps_queue(dev_maps, tci, index);
if (!netif_attr_test_mask(j, mask, nr_ids) ||
!netif_attr_test_online(j, online_mask, nr_ids))
if (!netif_attr_test_mask(j, mask, dev_maps->nr_ids) ||
!netif_attr_test_online(j, online_mask, dev_maps->nr_ids))
active |= remove_xps_queue(dev_maps, tci, index);
for (i = dev_maps->num_tc - tc, tci++; --i; tci++)
active |= remove_xps_queue(dev_maps, tci, index);
@ -3965,7 +3962,7 @@ static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb,
struct xps_map *map;
int queue_index = -1;
if (tc >= dev_maps->num_tc)
if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids)
return queue_index;
tci *= dev_maps->num_tc;
@ -4004,7 +4001,7 @@ static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev,
if (dev_maps) {
int tci = sk_rx_queue_get(sk);
if (tci >= 0 && tci < dev->num_rx_queues)
if (tci >= 0)
queue_index = __get_xps_queue_idx(dev, skb, dev_maps,
tci);
}