mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-13 14:24:11 +08:00
69c8b99871
mlx5 has a dedicated queue for PTP packets. Clarify that this sort of queues can also be accounted towards the base. Reviewed-by: Joe Damato <jdamato@fastly.com> Link: https://lore.kernel.org/r/20240529162922.3690698-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
293 lines
9.8 KiB
C
293 lines
9.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_NET_QUEUES_H
|
|
#define _LINUX_NET_QUEUES_H
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
/* See the netdev.yaml spec for definition of each statistic */
|
|
struct netdev_queue_stats_rx {
|
|
u64 bytes;
|
|
u64 packets;
|
|
u64 alloc_fail;
|
|
|
|
u64 hw_drops;
|
|
u64 hw_drop_overruns;
|
|
|
|
u64 csum_unnecessary;
|
|
u64 csum_none;
|
|
u64 csum_bad;
|
|
|
|
u64 hw_gro_packets;
|
|
u64 hw_gro_bytes;
|
|
u64 hw_gro_wire_packets;
|
|
u64 hw_gro_wire_bytes;
|
|
|
|
u64 hw_drop_ratelimits;
|
|
};
|
|
|
|
struct netdev_queue_stats_tx {
|
|
u64 bytes;
|
|
u64 packets;
|
|
|
|
u64 hw_drops;
|
|
u64 hw_drop_errors;
|
|
|
|
u64 csum_none;
|
|
u64 needs_csum;
|
|
|
|
u64 hw_gso_packets;
|
|
u64 hw_gso_bytes;
|
|
u64 hw_gso_wire_packets;
|
|
u64 hw_gso_wire_bytes;
|
|
|
|
u64 hw_drop_ratelimits;
|
|
|
|
u64 stop;
|
|
u64 wake;
|
|
};
|
|
|
|
/**
|
|
* struct netdev_stat_ops - netdev ops for fine grained stats
|
|
* @get_queue_stats_rx: get stats for a given Rx queue
|
|
* @get_queue_stats_tx: get stats for a given Tx queue
|
|
* @get_base_stats: get base stats (not belonging to any live instance)
|
|
*
|
|
* Query stats for a given object. The values of the statistics are undefined
|
|
* on entry (specifically they are *not* zero-initialized). Drivers should
|
|
* assign values only to the statistics they collect. Statistics which are not
|
|
* collected must be left undefined.
|
|
*
|
|
* Queue objects are not necessarily persistent, and only currently active
|
|
* queues are queried by the per-queue callbacks. This means that per-queue
|
|
* statistics will not generally add up to the total number of events for
|
|
* the device. The @get_base_stats callback allows filling in the delta
|
|
* between events for currently live queues and overall device history.
|
|
* @get_base_stats can also be used to report any miscellaneous packets
|
|
* transferred outside of the main set of queues used by the networking stack.
|
|
* When the statistics for the entire device are queried, first @get_base_stats
|
|
* is issued to collect the delta, and then a series of per-queue callbacks.
|
|
* Only statistics which are set in @get_base_stats will be reported
|
|
* at the device level, meaning that unlike in queue callbacks, setting
|
|
* a statistic to zero in @get_base_stats is a legitimate thing to do.
|
|
* This is because @get_base_stats has a second function of designating which
|
|
* statistics are in fact correct for the entire device (e.g. when history
|
|
* for some of the events is not maintained, and reliable "total" cannot
|
|
* be provided).
|
|
*
|
|
* Device drivers can assume that when collecting total device stats,
|
|
* the @get_base_stats and subsequent per-queue calls are performed
|
|
* "atomically" (without releasing the rtnl_lock).
|
|
*
|
|
* Device drivers are encouraged to reset the per-queue statistics when
|
|
* number of queues change. This is because the primary use case for
|
|
* per-queue statistics is currently to detect traffic imbalance.
|
|
*/
|
|
struct netdev_stat_ops {
|
|
void (*get_queue_stats_rx)(struct net_device *dev, int idx,
|
|
struct netdev_queue_stats_rx *stats);
|
|
void (*get_queue_stats_tx)(struct net_device *dev, int idx,
|
|
struct netdev_queue_stats_tx *stats);
|
|
void (*get_base_stats)(struct net_device *dev,
|
|
struct netdev_queue_stats_rx *rx,
|
|
struct netdev_queue_stats_tx *tx);
|
|
};
|
|
|
|
/**
|
|
* struct netdev_queue_mgmt_ops - netdev ops for queue management
|
|
*
|
|
* @ndo_queue_mem_size: Size of the struct that describes a queue's memory.
|
|
*
|
|
* @ndo_queue_mem_alloc: Allocate memory for an RX queue at the specified index.
|
|
* The new memory is written at the specified address.
|
|
*
|
|
* @ndo_queue_mem_free: Free memory from an RX queue.
|
|
*
|
|
* @ndo_queue_start: Start an RX queue with the specified memory and at the
|
|
* specified index.
|
|
*
|
|
* @ndo_queue_stop: Stop the RX queue at the specified index. The stopped
|
|
* queue's memory is written at the specified address.
|
|
*/
|
|
struct netdev_queue_mgmt_ops {
|
|
size_t ndo_queue_mem_size;
|
|
int (*ndo_queue_mem_alloc)(struct net_device *dev,
|
|
void *per_queue_mem,
|
|
int idx);
|
|
void (*ndo_queue_mem_free)(struct net_device *dev,
|
|
void *per_queue_mem);
|
|
int (*ndo_queue_start)(struct net_device *dev,
|
|
void *per_queue_mem,
|
|
int idx);
|
|
int (*ndo_queue_stop)(struct net_device *dev,
|
|
void *per_queue_mem,
|
|
int idx);
|
|
};
|
|
|
|
/**
|
|
* DOC: Lockless queue stopping / waking helpers.
|
|
*
|
|
* The netif_txq_maybe_stop() and __netif_txq_completed_wake()
|
|
* macros are designed to safely implement stopping
|
|
* and waking netdev queues without full lock protection.
|
|
*
|
|
* We assume that there can be no concurrent stop attempts and no concurrent
|
|
* wake attempts. The try-stop should happen from the xmit handler,
|
|
* while wake up should be triggered from NAPI poll context.
|
|
* The two may run concurrently (single producer, single consumer).
|
|
*
|
|
* The try-stop side is expected to run from the xmit handler and therefore
|
|
* it does not reschedule Tx (netif_tx_start_queue() instead of
|
|
* netif_tx_wake_queue()). Uses of the ``stop`` macros outside of the xmit
|
|
* handler may lead to xmit queue being enabled but not run.
|
|
* The waking side does not have similar context restrictions.
|
|
*
|
|
* The macros guarantee that rings will not remain stopped if there's
|
|
* space available, but they do *not* prevent false wake ups when
|
|
* the ring is full! Drivers should check for ring full at the start
|
|
* for the xmit handler.
|
|
*
|
|
* All descriptor ring indexes (and other relevant shared state) must
|
|
* be updated before invoking the macros.
|
|
*/
|
|
|
|
#define netif_txq_try_stop(txq, get_desc, start_thrs) \
|
|
({ \
|
|
int _res; \
|
|
\
|
|
netif_tx_stop_queue(txq); \
|
|
/* Producer index and stop bit must be visible \
|
|
* to consumer before we recheck. \
|
|
* Pairs with a barrier in __netif_txq_completed_wake(). \
|
|
*/ \
|
|
smp_mb__after_atomic(); \
|
|
\
|
|
/* We need to check again in a case another \
|
|
* CPU has just made room available. \
|
|
*/ \
|
|
_res = 0; \
|
|
if (unlikely(get_desc >= start_thrs)) { \
|
|
netif_tx_start_queue(txq); \
|
|
_res = -1; \
|
|
} \
|
|
_res; \
|
|
}) \
|
|
|
|
/**
|
|
* netif_txq_maybe_stop() - locklessly stop a Tx queue, if needed
|
|
* @txq: struct netdev_queue to stop/start
|
|
* @get_desc: get current number of free descriptors (see requirements below!)
|
|
* @stop_thrs: minimal number of available descriptors for queue to be left
|
|
* enabled
|
|
* @start_thrs: minimal number of descriptors to re-enable the queue, can be
|
|
* equal to @stop_thrs or higher to avoid frequent waking
|
|
*
|
|
* All arguments may be evaluated multiple times, beware of side effects.
|
|
* @get_desc must be a formula or a function call, it must always
|
|
* return up-to-date information when evaluated!
|
|
* Expected to be used from ndo_start_xmit, see the comment on top of the file.
|
|
*
|
|
* Returns:
|
|
* 0 if the queue was stopped
|
|
* 1 if the queue was left enabled
|
|
* -1 if the queue was re-enabled (raced with waking)
|
|
*/
|
|
#define netif_txq_maybe_stop(txq, get_desc, stop_thrs, start_thrs) \
|
|
({ \
|
|
int _res; \
|
|
\
|
|
_res = 1; \
|
|
if (unlikely(get_desc < stop_thrs)) \
|
|
_res = netif_txq_try_stop(txq, get_desc, start_thrs); \
|
|
_res; \
|
|
}) \
|
|
|
|
/* Variant of netdev_tx_completed_queue() which guarantees smp_mb() if
|
|
* @bytes != 0, regardless of kernel config.
|
|
*/
|
|
static inline void
|
|
netdev_txq_completed_mb(struct netdev_queue *dev_queue,
|
|
unsigned int pkts, unsigned int bytes)
|
|
{
|
|
if (IS_ENABLED(CONFIG_BQL))
|
|
netdev_tx_completed_queue(dev_queue, pkts, bytes);
|
|
else if (bytes)
|
|
smp_mb();
|
|
}
|
|
|
|
/**
|
|
* __netif_txq_completed_wake() - locklessly wake a Tx queue, if needed
|
|
* @txq: struct netdev_queue to stop/start
|
|
* @pkts: number of packets completed
|
|
* @bytes: number of bytes completed
|
|
* @get_desc: get current number of free descriptors (see requirements below!)
|
|
* @start_thrs: minimal number of descriptors to re-enable the queue
|
|
* @down_cond: down condition, predicate indicating that the queue should
|
|
* not be woken up even if descriptors are available
|
|
*
|
|
* All arguments may be evaluated multiple times.
|
|
* @get_desc must be a formula or a function call, it must always
|
|
* return up-to-date information when evaluated!
|
|
* Reports completed pkts/bytes to BQL.
|
|
*
|
|
* Returns:
|
|
* 0 if the queue was woken up
|
|
* 1 if the queue was already enabled (or disabled but @down_cond is true)
|
|
* -1 if the queue was left unchanged (@start_thrs not reached)
|
|
*/
|
|
#define __netif_txq_completed_wake(txq, pkts, bytes, \
|
|
get_desc, start_thrs, down_cond) \
|
|
({ \
|
|
int _res; \
|
|
\
|
|
/* Report to BQL and piggy back on its barrier. \
|
|
* Barrier makes sure that anybody stopping the queue \
|
|
* after this point sees the new consumer index. \
|
|
* Pairs with barrier in netif_txq_try_stop(). \
|
|
*/ \
|
|
netdev_txq_completed_mb(txq, pkts, bytes); \
|
|
\
|
|
_res = -1; \
|
|
if (pkts && likely(get_desc >= start_thrs)) { \
|
|
_res = 1; \
|
|
if (unlikely(netif_tx_queue_stopped(txq)) && \
|
|
!(down_cond)) { \
|
|
netif_tx_wake_queue(txq); \
|
|
_res = 0; \
|
|
} \
|
|
} \
|
|
_res; \
|
|
})
|
|
|
|
#define netif_txq_completed_wake(txq, pkts, bytes, get_desc, start_thrs) \
|
|
__netif_txq_completed_wake(txq, pkts, bytes, get_desc, start_thrs, false)
|
|
|
|
/* subqueue variants follow */
|
|
|
|
#define netif_subqueue_try_stop(dev, idx, get_desc, start_thrs) \
|
|
({ \
|
|
struct netdev_queue *txq; \
|
|
\
|
|
txq = netdev_get_tx_queue(dev, idx); \
|
|
netif_txq_try_stop(txq, get_desc, start_thrs); \
|
|
})
|
|
|
|
#define netif_subqueue_maybe_stop(dev, idx, get_desc, stop_thrs, start_thrs) \
|
|
({ \
|
|
struct netdev_queue *txq; \
|
|
\
|
|
txq = netdev_get_tx_queue(dev, idx); \
|
|
netif_txq_maybe_stop(txq, get_desc, stop_thrs, start_thrs); \
|
|
})
|
|
|
|
#define netif_subqueue_completed_wake(dev, idx, pkts, bytes, \
|
|
get_desc, start_thrs) \
|
|
({ \
|
|
struct netdev_queue *txq; \
|
|
\
|
|
txq = netdev_get_tx_queue(dev, idx); \
|
|
netif_txq_completed_wake(txq, pkts, bytes, \
|
|
get_desc, start_thrs); \
|
|
})
|
|
|
|
#endif
|