arch/um/drivers/vector_kern.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   4  */
   5
   6 #ifndef __UM_VECTOR_KERN_H
   7 #define __UM_VECTOR_KERN_H
   8
   9 #include <linux/netdevice.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/socket.h>
  13 #include <linux/list.h>
  14 #include <linux/ctype.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/interrupt.h>
  17 #include "vector_user.h"
  18
  19 /* Queue structure specially adapted for multiple enqueue/dequeue
  20  * in a mmsgrecv/mmsgsend context
  21  */
  22
  23 /* Dequeue method */
  24
  25 #define QUEUE_SENDMSG 0
  26 #define QUEUE_SENDMMSG 1
  27
  28 #define VECTOR_RX 1
  29 #define VECTOR_TX (1 << 1)
  30 #define VECTOR_BPF (1 << 2)
  31 #define VECTOR_QDISC_BYPASS (1 << 3)
  32 #define VECTOR_BPF_FLASH (1 << 4)
  33
  34 #define ETH_MAX_PACKET 1500
  35 #define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */
  36
  37 #define MAX_FILTER_PROG (2 << 16)
  38
  39 struct vector_queue {
  40         struct mmsghdr *mmsg_vector;
  41         void **skbuff_vector;
  42          /* backlink to device which owns us */
  43         struct net_device *dev;
  44         spinlock_t head_lock;
  45         spinlock_t tail_lock;
  46         int queue_depth, head, tail, max_depth, max_iov_frags;
  47         short options;
  48 };
  49
  50 struct vector_estats {
  51         uint64_t rx_queue_max;
  52         uint64_t rx_queue_running_average;
  53         uint64_t tx_queue_max;
  54         uint64_t tx_queue_running_average;
  55         uint64_t rx_encaps_errors;
  56         uint64_t tx_timeout_count;
  57         uint64_t tx_restart_queue;
  58         uint64_t tx_kicks;
  59         uint64_t tx_flow_control_xon;
  60         uint64_t tx_flow_control_xoff;
  61         uint64_t rx_csum_offload_good;
  62         uint64_t rx_csum_offload_errors;
  63         uint64_t sg_ok;
  64         uint64_t sg_linearized;
  65 };
  66
  67 #define VERIFY_HEADER_NOK -1
  68 #define VERIFY_HEADER_OK 0
  69 #define VERIFY_CSUM_OK 1
  70
  71 struct vector_private {
  72         struct list_head list;
  73         spinlock_t lock;
  74         struct net_device *dev;
  75
  76         int unit;
  77
  78         /* Timeout timer in TX */
  79
  80         struct timer_list tl;
  81
  82         /* Scheduled "remove device" work */
  83         struct work_struct reset_tx;
  84         struct vector_fds *fds;
  85
  86         struct vector_queue *rx_queue;
  87         struct vector_queue *tx_queue;
  88
  89         int rx_irq;
  90         int tx_irq;
  91
  92         struct arglist *parsed;
  93
  94         void *transport_data; /* transport specific params if needed */
  95
  96         int max_packet;
  97         int req_size; /* different from max packet - used for TSO */
  98         int headroom;
  99
 100         int options;
 101
 102         /* remote address if any - some transports will leave this as null */
 103
 104         int header_size;
 105         int rx_header_size;
 106         int coalesce;
 107
 108         void *header_rxbuffer;
 109         void *header_txbuffer;
 110
 111         int (*form_header)(uint8_t *header,
 112                 struct sk_buff *skb, struct vector_private *vp);
 113         int (*verify_header)(uint8_t *header,
 114                 struct sk_buff *skb, struct vector_private *vp);
 115
 116         spinlock_t stats_lock;
 117
 118         struct tasklet_struct tx_poll;
 119         bool rexmit_scheduled;
 120         bool opened;
 121         bool in_write_poll;
 122         bool in_error;
 123
 124         /* guest allowed to use ethtool flash to load bpf */
 125         bool bpf_via_flash;
 126
 127         /* ethtool stats */
 128
 129         struct vector_estats estats;
 130         struct sock_fprog *bpf;
 131
 132         char user[];
 133 };
 134
 135 extern int build_transport_data(struct vector_private *vp);
 136
 137 #endif