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numam-dpdk/drivers/net/tap/tap_rss.h

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net/tap: implement RSS using eBPF TAP PMD is required to support RSS queue mapping based on rte_flow API. An example usage for this requirement is failsafe transparent switching from a PCI device to TAP device while keep redirecting packets to the same RSS queues on both devices. TAP RSS implementation is based on eBPF programs sent to Linux kernel through BPF system calls and using netlink messages to reference the programs as part of traffic control commands. TC uses eBPF programs as classifiers and actions. eBPF classification: packets marked with an RSS queue will be directed to this queue using TC with "skbedit" action. BPF classifiers are downloaded to the kernel once on TAP creation for each TAP Rx queue. eBPF action: calculate the Toeplitz RSS hash based on L3 addresses and L4 ports. Mark the packet with the RSS queue according the resulting RSS hash, then reclassify the packet. BPF actions are downloaded to the kernel for each new RSS rule. TAP eBPF requires Linux version 4.9 configured with BPF. TAP PMD will successfully compile on systems with old or non-BPF configured kernels but RSS rules creation on TAP devices will not be successful Signed-off-by: Ophir Munk <ophirmu@mellanox.com> Acked-by: Pascal Mazon <pascal.mazon@6wind.com>
2018-01-20 21:11:36 +00:00
/* SPDX-License-Identifier: BSD-3-Clause
align SPDX Mellanox copyrights Aligning Mellanox SPDX copyrights to a single format. In addition replace to SPDX licence files which were missed. Signed-off-by: Shahaf Shuler <shahafs@mellanox.com> Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
2018-03-20 19:20:35 +00:00
* Copyright 2017 Mellanox Technologies, Ltd
net/tap: implement RSS using eBPF TAP PMD is required to support RSS queue mapping based on rte_flow API. An example usage for this requirement is failsafe transparent switching from a PCI device to TAP device while keep redirecting packets to the same RSS queues on both devices. TAP RSS implementation is based on eBPF programs sent to Linux kernel through BPF system calls and using netlink messages to reference the programs as part of traffic control commands. TC uses eBPF programs as classifiers and actions. eBPF classification: packets marked with an RSS queue will be directed to this queue using TC with "skbedit" action. BPF classifiers are downloaded to the kernel once on TAP creation for each TAP Rx queue. eBPF action: calculate the Toeplitz RSS hash based on L3 addresses and L4 ports. Mark the packet with the RSS queue according the resulting RSS hash, then reclassify the packet. BPF actions are downloaded to the kernel for each new RSS rule. TAP eBPF requires Linux version 4.9 configured with BPF. TAP PMD will successfully compile on systems with old or non-BPF configured kernels but RSS rules creation on TAP devices will not be successful Signed-off-by: Ophir Munk <ophirmu@mellanox.com> Acked-by: Pascal Mazon <pascal.mazon@6wind.com>
2018-01-20 21:11:36 +00:00
*/
#ifndef _TAP_RSS_H_
#define _TAP_RSS_H_
#ifndef TAP_MAX_QUEUES
#define TAP_MAX_QUEUES 16
#endif
net/tap: report on supported RSS hash functions Report on TAP supported RSS functions as part of dev_infos_get callback: ETH_RSS_IP, ETH_RSS_UDP and ETH_RSS_TCP. Known limitation: TAP supports all of the above hash functions together and not in partial combinations. Previous to this commit RSS support was reported as none. Since the introduction of [1] it is required that all RSS configurations will be verified. [1] commit 8863a1fbfc66 ("ethdev: add supported hash function check") Signed-off-by: Ophir Munk <ophirmu@mellanox.com> Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
2018-05-08 17:07:35 +00:00
/* Fixed RSS hash key size in bytes. */
#define TAP_RSS_HASH_KEY_SIZE 40
net/tap: support RSS hash update Add RSS hash update callback to eth_dev_ops. Signed-off-by: Ophir Munk <ophirmu@mellanox.com> Acked-by: Keith Wiles <keith.wiles@intel.com>
2018-05-10 17:30:25 +00:00
/* Supported RSS */
#define TAP_RSS_HF_MASK (~(ETH_RSS_IP | ETH_RSS_UDP | ETH_RSS_TCP))
net/tap: implement RSS using eBPF TAP PMD is required to support RSS queue mapping based on rte_flow API. An example usage for this requirement is failsafe transparent switching from a PCI device to TAP device while keep redirecting packets to the same RSS queues on both devices. TAP RSS implementation is based on eBPF programs sent to Linux kernel through BPF system calls and using netlink messages to reference the programs as part of traffic control commands. TC uses eBPF programs as classifiers and actions. eBPF classification: packets marked with an RSS queue will be directed to this queue using TC with "skbedit" action. BPF classifiers are downloaded to the kernel once on TAP creation for each TAP Rx queue. eBPF action: calculate the Toeplitz RSS hash based on L3 addresses and L4 ports. Mark the packet with the RSS queue according the resulting RSS hash, then reclassify the packet. BPF actions are downloaded to the kernel for each new RSS rule. TAP eBPF requires Linux version 4.9 configured with BPF. TAP PMD will successfully compile on systems with old or non-BPF configured kernels but RSS rules creation on TAP devices will not be successful Signed-off-by: Ophir Munk <ophirmu@mellanox.com> Acked-by: Pascal Mazon <pascal.mazon@6wind.com>
2018-01-20 21:11:36 +00:00
/* hashed fields for RSS */
enum hash_field {
HASH_FIELD_IPV4_L3, /* IPv4 src/dst addr */
HASH_FIELD_IPV4_L3_L4, /* IPv4 src/dst addr + L4 src/dst ports */
HASH_FIELD_IPV6_L3, /* IPv6 src/dst addr */
HASH_FIELD_IPV6_L3_L4, /* IPv6 src/dst addr + L4 src/dst ports */
HASH_FIELD_L2_SRC, /* Ethernet src addr */
HASH_FIELD_L2_DST, /* Ethernet dst addr */
HASH_FIELD_L3_SRC, /* L3 src addr */
HASH_FIELD_L3_DST, /* L3 dst addr */
HASH_FIELD_L4_SRC, /* TCP/UDP src ports */
HASH_FIELD_L4_DST, /* TCP/UDP dst ports */
};
struct rss_key {
__u8 key[128];
__u32 hash_fields;
__u32 key_size;
__u32 queues[TAP_MAX_QUEUES];
__u32 nb_queues;
} __attribute__((packed));
#endif /* _TAP_RSS_H_ */
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