1/* Copyright (c) 2007 Coraid, Inc. See COPYING for GPL terms. */ 2/* 3 * aoenet.c 4 * Ethernet portion of AoE driver 5 */ 6 7#include <linux/gfp.h> 8#include <linux/hdreg.h> 9#include <linux/blkdev.h> 10#include <linux/netdevice.h> 11#include <linux/moduleparam.h> 12#include <net/net_namespace.h> 13#include <asm/unaligned.h> 14#include "aoe.h" 15 16#define NECODES 5 17 18static char *aoe_errlist[] = 19{ 20 "no such error", 21 "unrecognized command code", 22 "bad argument parameter", 23 "device unavailable", 24 "config string present", 25 "unsupported version" 26}; 27 28enum { 29 IFLISTSZ = 1024, 30}; 31 32static char aoe_iflist[IFLISTSZ]; 33module_param_string(aoe_iflist, aoe_iflist, IFLISTSZ, 0600); 34MODULE_PARM_DESC(aoe_iflist, "aoe_iflist=\"dev1 [dev2 ...]\""); 35 36#ifndef MODULE 37static int __init aoe_iflist_setup(char *str) 38{ 39 strncpy(aoe_iflist, str, IFLISTSZ); 40 aoe_iflist[IFLISTSZ - 1] = '\0'; 41 return 1; 42} 43 44__setup("aoe_iflist=", aoe_iflist_setup); 45#endif 46 47int 48is_aoe_netif(struct net_device *ifp) 49{ 50 register char *p, *q; 51 register int len; 52 53 if (aoe_iflist[0] == '\0') 54 return 1; 55 56 p = aoe_iflist + strspn(aoe_iflist, WHITESPACE); 57 for (; *p; p = q + strspn(q, WHITESPACE)) { 58 q = p + strcspn(p, WHITESPACE); 59 if (q != p) 60 len = q - p; 61 else 62 len = strlen(p); /* last token in aoe_iflist */ 63 64 if (strlen(ifp->name) == len && !strncmp(ifp->name, p, len)) 65 return 1; 66 if (q == p) 67 break; 68 } 69 70 return 0; 71} 72 73int 74set_aoe_iflist(const char __user *user_str, size_t size) 75{ 76 if (size >= IFLISTSZ) 77 return -EINVAL; 78 79 if (copy_from_user(aoe_iflist, user_str, size)) { 80 printk(KERN_INFO "aoe: copy from user failed\n"); 81 return -EFAULT; 82 } 83 aoe_iflist[size] = 0x00; 84 return 0; 85} 86 87void 88aoenet_xmit(struct sk_buff_head *queue) 89{ 90 struct sk_buff *skb, *tmp; 91 92 skb_queue_walk_safe(queue, skb, tmp) { 93 __skb_unlink(skb, queue); 94 dev_queue_xmit(skb); 95 } 96} 97 98/* 99 * (1) len doesn't include the header by default. I want this. 100 */ 101static int 102aoenet_rcv(struct sk_buff *skb, struct net_device *ifp, struct packet_type *pt, struct net_device *orig_dev) 103{ 104 struct aoe_hdr *h; 105 u32 n; 106 107 if (dev_net(ifp) != &init_net) 108 goto exit; 109 110 skb = skb_share_check(skb, GFP_ATOMIC); 111 if (skb == NULL) 112 return 0; 113 if (skb_linearize(skb)) 114 goto exit; 115 if (!is_aoe_netif(ifp)) 116 goto exit; 117 skb_push(skb, ETH_HLEN); /* (1) */ 118 119 h = (struct aoe_hdr *) skb_mac_header(skb); 120 n = get_unaligned_be32(&h->tag); 121 if ((h->verfl & AOEFL_RSP) == 0 || (n & 1<<31)) 122 goto exit; 123 124 if (h->verfl & AOEFL_ERR) { 125 n = h->err; 126 if (n > NECODES) 127 n = 0; 128 if (net_ratelimit()) 129 printk(KERN_ERR 130 "%s%d.%d@%s; ecode=%d '%s'\n", 131 "aoe: error packet from ", 132 get_unaligned_be16(&h->major), 133 h->minor, skb->dev->name, 134 h->err, aoe_errlist[n]); 135 goto exit; 136 } 137 138 switch (h->cmd) { 139 case AOECMD_ATA: 140 aoecmd_ata_rsp(skb); 141 break; 142 case AOECMD_CFG: 143 aoecmd_cfg_rsp(skb); 144 break; 145 default: 146 if (h->cmd >= AOECMD_VEND_MIN) 147 break; /* don't complain about vendor commands */ 148 printk(KERN_INFO "aoe: unknown cmd %d\n", h->cmd); 149 } 150exit: 151 dev_kfree_skb(skb); 152 return 0; 153} 154 155static struct packet_type aoe_pt __read_mostly = { 156 .type = __constant_htons(ETH_P_AOE), 157 .func = aoenet_rcv, 158}; 159 160int __init 161aoenet_init(void) 162{ 163 dev_add_pack(&aoe_pt); 164 return 0; 165} 166 167void 168aoenet_exit(void) 169{ 170 dev_remove_pack(&aoe_pt); 171} 172