a46f8d584e
Introduce the fail-safe poll mode driver initialization and enable its build infrastructure. This PMD allows for applications to benefit from true hot-plugging support without having to implement it. It intercepts and manages Ethernet device removal events issued by slave PMDs and re-initializes them transparently when brought back. It also allows defining a contingency to the removal of a device, by designating a fail-over device that will take on transmitting operations if the preferred device is removed. Applications only see a fail-safe instance, without caring for underlying activity ensuring their continued operations. Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com> Acked-by: Olga Shern <olgas@mellanox.com>
209 lines
5.9 KiB
C
209 lines
5.9 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright 2017 6WIND S.A.
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* Copyright 2017 Mellanox.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of 6WIND S.A. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _RTE_ETH_FAILSAFE_PRIVATE_H_
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#define _RTE_ETH_FAILSAFE_PRIVATE_H_
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#include <rte_dev.h>
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#include <rte_ethdev.h>
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#include <rte_devargs.h>
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#define FAILSAFE_DRIVER_NAME "Fail-safe PMD"
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#define PMD_FAILSAFE_MAC_KVARG "mac"
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#define PMD_FAILSAFE_PARAM_STRING \
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"dev(<ifc>)," \
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"mac=mac_addr" \
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""
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#define FAILSAFE_MAX_ETHPORTS 2
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#define FAILSAFE_MAX_ETHADDR 128
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/* TYPES */
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struct rxq {
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struct fs_priv *priv;
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uint16_t qid;
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/* id of last sub_device polled */
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uint8_t last_polled;
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unsigned int socket_id;
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struct rte_eth_rxq_info info;
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};
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struct txq {
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struct fs_priv *priv;
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uint16_t qid;
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unsigned int socket_id;
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struct rte_eth_txq_info info;
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};
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enum dev_state {
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DEV_UNDEFINED,
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DEV_PARSED,
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DEV_PROBED,
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DEV_ACTIVE,
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DEV_STARTED,
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};
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struct sub_device {
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/* Exhaustive DPDK device description */
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struct rte_devargs devargs;
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struct rte_bus *bus;
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struct rte_device *dev;
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struct rte_eth_dev *edev;
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/* Device state machine */
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enum dev_state state;
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};
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struct fs_priv {
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struct rte_eth_dev *dev;
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/*
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* Set of sub_devices.
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* subs[0] is the preferred device
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* any other is just another slave
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*/
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struct sub_device *subs;
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uint8_t subs_head; /* if head == tail, no subs */
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uint8_t subs_tail; /* first invalid */
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uint8_t subs_tx; /* current emitting device */
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uint8_t current_probed;
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/* current number of mac_addr slots allocated. */
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uint32_t nb_mac_addr;
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struct ether_addr mac_addrs[FAILSAFE_MAX_ETHADDR];
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uint32_t mac_addr_pool[FAILSAFE_MAX_ETHADDR];
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/* current capabilities */
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struct rte_eth_dev_info infos;
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};
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/* RX / TX */
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uint16_t failsafe_rx_burst(void *rxq,
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struct rte_mbuf **rx_pkts, uint16_t nb_pkts);
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uint16_t failsafe_tx_burst(void *txq,
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struct rte_mbuf **tx_pkts, uint16_t nb_pkts);
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/* ARGS */
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int failsafe_args_parse(struct rte_eth_dev *dev, const char *params);
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void failsafe_args_free(struct rte_eth_dev *dev);
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int failsafe_args_count_subdevice(struct rte_eth_dev *dev, const char *params);
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/* EAL */
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int failsafe_eal_init(struct rte_eth_dev *dev);
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int failsafe_eal_uninit(struct rte_eth_dev *dev);
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/* GLOBALS */
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extern const char pmd_failsafe_driver_name[];
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extern const struct eth_dev_ops failsafe_ops;
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extern int mac_from_arg;
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/* HELPERS */
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/* dev: (struct rte_eth_dev *) fail-safe device */
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#define PRIV(dev) \
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((struct fs_priv *)(dev)->data->dev_private)
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/* sdev: (struct sub_device *) */
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#define ETH(sdev) \
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((sdev)->edev)
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/* sdev: (struct sub_device *) */
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#define PORT_ID(sdev) \
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(ETH(sdev)->data->port_id)
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/**
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* Stateful iterator construct over fail-safe sub-devices:
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* s: (struct sub_device *), iterator
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* i: (uint8_t), increment
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* dev: (struct rte_eth_dev *), fail-safe ethdev
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* state: (enum dev_state), minimum acceptable device state
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*/
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#define FOREACH_SUBDEV_STATE(s, i, dev, state) \
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for (i = fs_find_next((dev), 0, state); \
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i < PRIV(dev)->subs_tail && (s = &PRIV(dev)->subs[i]); \
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i = fs_find_next((dev), i + 1, state))
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/**
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* Iterator construct over fail-safe sub-devices:
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* s: (struct sub_device *), iterator
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* i: (uint8_t), increment
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* dev: (struct rte_eth_dev *), fail-safe ethdev
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*/
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#define FOREACH_SUBDEV(s, i, dev) \
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FOREACH_SUBDEV_STATE(s, i, dev, DEV_UNDEFINED)
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/* dev: (struct rte_eth_dev *) fail-safe device */
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#define PREFERRED_SUBDEV(dev) \
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(&PRIV(dev)->subs[0])
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/* dev: (struct rte_eth_dev *) fail-safe device */
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#define TX_SUBDEV(dev) \
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(PRIV(dev)->subs_tx >= PRIV(dev)->subs_tail ? NULL \
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: (PRIV(dev)->subs[PRIV(dev)->subs_tx].state < DEV_PROBED ? NULL \
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: &PRIV(dev)->subs[PRIV(dev)->subs_tx]))
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/**
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* s: (struct sub_device *)
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* ops: (struct eth_dev_ops) member
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*/
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#define SUBOPS(s, ops) \
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(ETH(s)->dev_ops->ops)
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#define LOG__(level, m, ...) \
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RTE_LOG(level, PMD, "net_failsafe: " m "%c", __VA_ARGS__)
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#define LOG_(level, ...) LOG__(level, __VA_ARGS__, '\n')
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#define DEBUG(...) LOG_(DEBUG, __VA_ARGS__)
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#define INFO(...) LOG_(INFO, __VA_ARGS__)
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#define WARN(...) LOG_(WARNING, __VA_ARGS__)
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#define ERROR(...) LOG_(ERR, __VA_ARGS__)
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/* inlined functions */
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static inline uint8_t
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fs_find_next(struct rte_eth_dev *dev, uint8_t sid,
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enum dev_state min_state)
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{
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while (sid < PRIV(dev)->subs_tail) {
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if (PRIV(dev)->subs[sid].state >= min_state)
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break;
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sid++;
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}
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if (sid >= PRIV(dev)->subs_tail)
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return PRIV(dev)->subs_tail;
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return sid;
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}
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#endif /* _RTE_ETH_FAILSAFE_PRIVATE_H_ */
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