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net/ethtool: support set coalesce per queue 

This patch implements sub command ETHTOOL_SCOALESCE for ioctl
ETHTOOL_PERQUEUE. It introduces an interface set_per_queue_coalesce to
set coalesce of each masked queue to device driver. The wanted coalesce
information are stored in "data" for each masked queue, which can copy
from userspace.
If it fails to set coalesce to device driver, the value which already
set to specific queue will be tried to rollback.

Signed-off-by: Kan Liang <kan.liang@intel.com>
Reviewed-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kan Liang 2016-02-19 09:24:03 -05:00 committed by David S. Miller
parent 421797b1aa
commit f38d138a7d
2 changed files with 68 additions and 0 deletions
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7
include/linux/ethtool.h
View File

@ -206,6 +206,11 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
* a TX queue has this number, return -EINVAL. If only a RX queue or a TX
* queue has this number, set the inapplicable fields to ~0 and return 0.
* Returns a negative error code or zero.
* @set_per_queue_coalesce: Set interrupt coalescing parameters per queue.
* It must check that the given queue number is valid. If neither a RX nor
* a TX queue has this number, return -EINVAL. If only a RX queue or a TX
* queue has this number, ignore the inapplicable fields.
* Returns a negative error code or zero.
*
* All operations are optional (i.e. the function pointer may be set
* to %NULL) and callers must take this into account. Callers must
@ -286,6 +291,8 @@ struct ethtool_ops {
const struct ethtool_tunable *, const void *);
int (*get_per_queue_coalesce)(struct net_device *, u32,
struct ethtool_coalesce *);
int (*set_per_queue_coalesce)(struct net_device *, u32,
struct ethtool_coalesce *);
};
#endif /* _LINUX_ETHTOOL_H */

61
net/core/ethtool.c
View File

@ -1920,6 +1920,65 @@ static int ethtool_get_per_queue_coalesce(struct net_device *dev,
return 0;
}
static int ethtool_set_per_queue_coalesce(struct net_device *dev,
void __user *useraddr,
struct ethtool_per_queue_op *per_queue_opt)
{
u32 bit;
int i, ret = 0;
int n_queue;
struct ethtool_coalesce *backup = NULL, *tmp = NULL;
DECLARE_BITMAP(queue_mask, MAX_NUM_QUEUE);
if ((!dev->ethtool_ops->set_per_queue_coalesce) ||
(!dev->ethtool_ops->get_per_queue_coalesce))
return -EOPNOTSUPP;
useraddr += sizeof(*per_queue_opt);
bitmap_from_u32array(queue_mask,
MAX_NUM_QUEUE,
per_queue_opt->queue_mask,
DIV_ROUND_UP(MAX_NUM_QUEUE, 32));
n_queue = bitmap_weight(queue_mask, MAX_NUM_QUEUE);
tmp = backup = kmalloc_array(n_queue, sizeof(*backup), GFP_KERNEL);
if (!backup)
return -ENOMEM;
for_each_set_bit(bit, queue_mask, MAX_NUM_QUEUE) {
struct ethtool_coalesce coalesce;
ret = dev->ethtool_ops->get_per_queue_coalesce(dev, bit, tmp);
if (ret != 0)
goto roll_back;
tmp++;
if (copy_from_user(&coalesce, useraddr, sizeof(coalesce))) {
ret = -EFAULT;
goto roll_back;
}
ret = dev->ethtool_ops->set_per_queue_coalesce(dev, bit, &coalesce);
if (ret != 0)
goto roll_back;
useraddr += sizeof(coalesce);
}
roll_back:
if (ret != 0) {
tmp = backup;
for_each_set_bit(i, queue_mask, bit) {
dev->ethtool_ops->set_per_queue_coalesce(dev, i, tmp);
tmp++;
}
}
kfree(backup);
return ret;
}
static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
{
struct ethtool_per_queue_op per_queue_opt;
@ -1930,6 +1989,8 @@ static int ethtool_set_per_queue(struct net_device *dev, void __user *useraddr)
switch (per_queue_opt.sub_command) {
case ETHTOOL_GCOALESCE:
return ethtool_get_per_queue_coalesce(dev, useraddr, &per_queue_opt);
case ETHTOOL_SCOALESCE:
return ethtool_set_per_queue_coalesce(dev, useraddr, &per_queue_opt);
default:
return -EOPNOTSUPP;
};