projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| aecd67b6 JDB |
1 | /* net/core/xdp.c |
| 2 | * | |
| 3 | * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc. | |
| 4 | * Released under terms in GPL version 2. See COPYING. | |
| 5 | */ | |
| 6 | #include <linux/types.h> | |
| 7 | #include <linux/mm.h> | |
| 8 | ||
| 9 | #include <net/xdp.h> | |
| 10 | ||
| 11 | #define REG_STATE_NEW 0x0 | |
| 12 | #define REG_STATE_REGISTERED 0x1 | |
| 13 | #define REG_STATE_UNREGISTERED 0x2 | |
| 14 | #define REG_STATE_UNUSED 0x3 | |
| 15 | ||
| 16 | void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq) | |
| 17 | { | |
| 18 | /* Simplify driver cleanup code paths, allow unreg "unused" */ | |
| 19 | if (xdp_rxq->reg_state == REG_STATE_UNUSED) | |
| 20 | return; | |
| 21 | ||
| 22 | WARN(!(xdp_rxq->reg_state == REG_STATE_REGISTERED), "Driver BUG"); | |
| 23 | ||
| 24 | xdp_rxq->reg_state = REG_STATE_UNREGISTERED; | |
| 25 | xdp_rxq->dev = NULL; | |
| 26 | } | |
| 27 | EXPORT_SYMBOL_GPL(xdp_rxq_info_unreg); | |
| 28 | ||
| 29 | static void xdp_rxq_info_init(struct xdp_rxq_info *xdp_rxq) | |
| 30 | { | |
| 31 | memset(xdp_rxq, 0, sizeof(*xdp_rxq)); | |
| 32 | } | |
| 33 | ||
| 34 | /* Returns 0 on success, negative on failure */ | |
| 35 | int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, | |
| 36 | struct net_device *dev, u32 queue_index) | |
| 37 | { | |
| 38 | if (xdp_rxq->reg_state == REG_STATE_UNUSED) { | |
| 39 | WARN(1, "Driver promised not to register this"); | |
| 40 | return -EINVAL; | |
| 41 | } | |
| 42 | ||
| 43 | if (xdp_rxq->reg_state == REG_STATE_REGISTERED) { | |
| 44 | WARN(1, "Missing unregister, handled but fix driver"); | |
| 45 | xdp_rxq_info_unreg(xdp_rxq); | |
| 46 | } | |
| 47 | ||
| 48 | if (!dev) { | |
| 49 | WARN(1, "Missing net_device from driver"); | |
| 50 | return -ENODEV; | |
| 51 | } | |
| 52 | ||
| 53 | /* State either UNREGISTERED or NEW */ | |
| 54 | xdp_rxq_info_init(xdp_rxq); | |
| 55 | xdp_rxq->dev = dev; | |
| 56 | xdp_rxq->queue_index = queue_index; | |
| 57 | ||
| 58 | xdp_rxq->reg_state = REG_STATE_REGISTERED; | |
| 59 | return 0; | |
| 60 | } | |
| 61 | EXPORT_SYMBOL_GPL(xdp_rxq_info_reg); | |
| 62 | ||
| 63 | void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq) | |
| 64 | { | |
| 65 | xdp_rxq->reg_state = REG_STATE_UNUSED; | |
| 66 | } | |
| 67 | EXPORT_SYMBOL_GPL(xdp_rxq_info_unused); | |
| c0124f32 JDB |
68 | |
| 69 | bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq) | |
| 70 | { | |
| 71 | return (xdp_rxq->reg_state == REG_STATE_REGISTERED); | |
| 72 | } | |
| 73 | EXPORT_SYMBOL_GPL(xdp_rxq_info_is_reg); |