arch/um/drivers/vector_kern.h

   1 /*
   2  * Copyright (C) 2002 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   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
  33 #define ETH_MAX_PACKET 1500
  34 #define ETH_HEADER_OTHER 32 /* just in case someone decides to go mad on QnQ */
  35
  36 struct vector_queue {
  37         struct mmsghdr *mmsg_vector;
  38         void **skbuff_vector;
  39          /* backlink to device which owns us */
  40         struct net_device *dev;
  41         spinlock_t head_lock;
  42         spinlock_t tail_lock;
  43         int queue_depth, head, tail, max_depth, max_iov_frags;
  44         short options;
  45 };
  46
  47 struct vector_estats {
  48         uint64_t rx_queue_max;
  49         uint64_t rx_queue_running_average;
  50         uint64_t tx_queue_max;
  51         uint64_t tx_queue_running_average;
  52         uint64_t rx_encaps_errors;
  53         uint64_t tx_timeout_count;
  54         uint64_t tx_restart_queue;
  55         uint64_t tx_kicks;
  56         uint64_t tx_flow_control_xon;
  57         uint64_t tx_flow_control_xoff;
  58         uint64_t rx_csum_offload_good;
  59         uint64_t rx_csum_offload_errors;
  60         uint64_t sg_ok;
  61         uint64_t sg_linearized;
  62 };
  63
  64 #define VERIFY_HEADER_NOK -1
  65 #define VERIFY_HEADER_OK 0
  66 #define VERIFY_CSUM_OK 1
  67
  68 struct vector_private {
  69         struct list_head list;
  70         spinlock_t lock;
  71         struct net_device *dev;
  72
  73         int unit;
  74
  75         /* Timeout timer in TX */
  76
  77         struct timer_list tl;
  78
  79         /* Scheduled "remove device" work */
  80         struct work_struct reset_tx;
  81         struct vector_fds *fds;
  82
  83         struct vector_queue *rx_queue;
  84         struct vector_queue *tx_queue;
  85
  86         int rx_irq;
  87         int tx_irq;
  88
  89         struct arglist *parsed;
  90
  91         void *transport_data; /* transport specific params if needed */
  92
  93         int max_packet;
  94         int req_size; /* different from max packet - used for TSO */
  95         int headroom;
  96
  97         int options;
  98
  99         /* remote address if any - some transports will leave this as null */
 100
 101         int header_size;
 102         int rx_header_size;
 103         int coalesce;
 104
 105         void *header_rxbuffer;
 106         void *header_txbuffer;
 107
 108         int (*form_header)(uint8_t *header,
 109                 struct sk_buff *skb, struct vector_private *vp);
 110         int (*verify_header)(uint8_t *header,
 111                 struct sk_buff *skb, struct vector_private *vp);
 112
 113         spinlock_t stats_lock;
 114
 115         struct tasklet_struct tx_poll;
 116         bool rexmit_scheduled;
 117         bool opened;
 118         bool in_write_poll;
 119
 120         /* ethtool stats */
 121
 122         struct vector_estats estats;
 123         void *bpf;
 124
 125         char user[0];
 126 };
 127
 128 extern int build_transport_data(struct vector_private *vp);
 129
 130 #endif