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