David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1 | /* sunvnet.c: Sun LDOM Virtual Network Driver. |
| 2 | * |
David S. Miller | 3d452e5 | 2008-09-01 01:48:52 -0700 | [diff] [blame] | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 6 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 7 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 8 | #include <linux/module.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/delay.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/netdevice.h> |
| 15 | #include <linux/ethtool.h> |
| 16 | #include <linux/etherdevice.h> |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 17 | #include <linux/mutex.h> |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 18 | #include <linux/highmem.h> |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 19 | #include <linux/if_vlan.h> |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 20 | |
David L Stevens | a2b78e9 | 2014-09-29 19:48:24 -0400 | [diff] [blame] | 21 | #if IS_ENABLED(CONFIG_IPV6) |
| 22 | #include <linux/icmpv6.h> |
| 23 | #endif |
| 24 | |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 25 | #include <net/ip.h> |
David L Stevens | a2b78e9 | 2014-09-29 19:48:24 -0400 | [diff] [blame] | 26 | #include <net/icmp.h> |
| 27 | #include <net/route.h> |
| 28 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 29 | #include <asm/vio.h> |
| 30 | #include <asm/ldc.h> |
| 31 | |
| 32 | #include "sunvnet.h" |
| 33 | |
| 34 | #define DRV_MODULE_NAME "sunvnet" |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 35 | #define DRV_MODULE_VERSION "1.0" |
| 36 | #define DRV_MODULE_RELDATE "June 25, 2007" |
| 37 | |
Bill Pemberton | f73d12b | 2012-12-03 09:24:02 -0500 | [diff] [blame] | 38 | static char version[] = |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 39 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
| 40 | MODULE_AUTHOR("David S. Miller (davem@davemloft.net)"); |
| 41 | MODULE_DESCRIPTION("Sun LDOM virtual network driver"); |
| 42 | MODULE_LICENSE("GPL"); |
| 43 | MODULE_VERSION(DRV_MODULE_VERSION); |
| 44 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 45 | #define VNET_MAX_TXQS 16 |
| 46 | |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 47 | /* Heuristic for the number of times to exponentially backoff and |
| 48 | * retry sending an LDC trigger when EAGAIN is encountered |
| 49 | */ |
| 50 | #define VNET_MAX_RETRIES 10 |
| 51 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 52 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start); |
| 53 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 54 | /* Ordered from largest major to lowest */ |
| 55 | static struct vio_version vnet_versions[] = { |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 56 | { .major = 1, .minor = 8 }, |
| 57 | { .major = 1, .minor = 7 }, |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 58 | { .major = 1, .minor = 6 }, |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 59 | { .major = 1, .minor = 0 }, |
| 60 | }; |
| 61 | |
| 62 | static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr) |
| 63 | { |
| 64 | return vio_dring_avail(dr, VNET_TX_RING_SIZE); |
| 65 | } |
| 66 | |
| 67 | static int vnet_handle_unknown(struct vnet_port *port, void *arg) |
| 68 | { |
| 69 | struct vio_msg_tag *pkt = arg; |
| 70 | |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 71 | pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 72 | pkt->type, pkt->stype, pkt->stype_env, pkt->sid); |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 73 | pr_err("Resetting connection\n"); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 74 | |
| 75 | ldc_disconnect(port->vio.lp); |
| 76 | |
| 77 | return -ECONNRESET; |
| 78 | } |
| 79 | |
David L Stevens | d673248 | 2014-12-02 15:30:55 -0500 | [diff] [blame] | 80 | static int vnet_port_alloc_tx_ring(struct vnet_port *port); |
| 81 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 82 | static int vnet_send_attr(struct vio_driver_state *vio) |
| 83 | { |
| 84 | struct vnet_port *port = to_vnet_port(vio); |
| 85 | struct net_device *dev = port->vp->dev; |
| 86 | struct vio_net_attr_info pkt; |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 87 | int framelen = ETH_FRAME_LEN; |
David L Stevens | d673248 | 2014-12-02 15:30:55 -0500 | [diff] [blame] | 88 | int i, err; |
| 89 | |
| 90 | err = vnet_port_alloc_tx_ring(to_vnet_port(vio)); |
| 91 | if (err) |
| 92 | return err; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 93 | |
| 94 | memset(&pkt, 0, sizeof(pkt)); |
| 95 | pkt.tag.type = VIO_TYPE_CTRL; |
| 96 | pkt.tag.stype = VIO_SUBTYPE_INFO; |
| 97 | pkt.tag.stype_env = VIO_ATTR_INFO; |
| 98 | pkt.tag.sid = vio_send_sid(vio); |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 99 | if (vio_version_before(vio, 1, 2)) |
| 100 | pkt.xfer_mode = VIO_DRING_MODE; |
| 101 | else |
| 102 | pkt.xfer_mode = VIO_NEW_DRING_MODE; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 103 | pkt.addr_type = VNET_ADDR_ETHERMAC; |
| 104 | pkt.ack_freq = 0; |
| 105 | for (i = 0; i < 6; i++) |
| 106 | pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8); |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 107 | if (vio_version_after(vio, 1, 3)) { |
| 108 | if (port->rmtu) { |
| 109 | port->rmtu = min(VNET_MAXPACKET, port->rmtu); |
| 110 | pkt.mtu = port->rmtu; |
| 111 | } else { |
| 112 | port->rmtu = VNET_MAXPACKET; |
| 113 | pkt.mtu = port->rmtu; |
| 114 | } |
| 115 | if (vio_version_after_eq(vio, 1, 6)) |
| 116 | pkt.options = VIO_TX_DRING; |
| 117 | } else if (vio_version_before(vio, 1, 3)) { |
| 118 | pkt.mtu = framelen; |
| 119 | } else { /* v1.3 */ |
| 120 | pkt.mtu = framelen + VLAN_HLEN; |
| 121 | } |
| 122 | |
| 123 | pkt.plnk_updt = PHYSLINK_UPDATE_NONE; |
| 124 | pkt.cflags = 0; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 125 | |
| 126 | viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 127 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " |
| 128 | "cflags[0x%04x] lso_max[%u]\n", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 129 | pkt.xfer_mode, pkt.addr_type, |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 130 | (unsigned long long)pkt.addr, |
| 131 | pkt.ack_freq, pkt.plnk_updt, pkt.options, |
| 132 | (unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen); |
| 133 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 134 | |
| 135 | return vio_ldc_send(vio, &pkt, sizeof(pkt)); |
| 136 | } |
| 137 | |
| 138 | static int handle_attr_info(struct vio_driver_state *vio, |
| 139 | struct vio_net_attr_info *pkt) |
| 140 | { |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 141 | struct vnet_port *port = to_vnet_port(vio); |
| 142 | u64 localmtu; |
| 143 | u8 xfer_mode; |
| 144 | |
| 145 | viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] " |
| 146 | "ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] " |
| 147 | " (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 148 | pkt->xfer_mode, pkt->addr_type, |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 149 | (unsigned long long)pkt->addr, |
| 150 | pkt->ack_freq, pkt->plnk_updt, pkt->options, |
| 151 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, |
| 152 | pkt->ipv4_lso_maxlen); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 153 | |
| 154 | pkt->tag.sid = vio_send_sid(vio); |
| 155 | |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 156 | xfer_mode = pkt->xfer_mode; |
| 157 | /* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */ |
| 158 | if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE) |
| 159 | xfer_mode = VIO_NEW_DRING_MODE; |
| 160 | |
| 161 | /* MTU negotiation: |
| 162 | * < v1.3 - ETH_FRAME_LEN exactly |
| 163 | * > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change |
| 164 | * pkt->mtu for ACK |
| 165 | * = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly |
| 166 | */ |
| 167 | if (vio_version_before(vio, 1, 3)) { |
| 168 | localmtu = ETH_FRAME_LEN; |
| 169 | } else if (vio_version_after(vio, 1, 3)) { |
| 170 | localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET; |
| 171 | localmtu = min(pkt->mtu, localmtu); |
| 172 | pkt->mtu = localmtu; |
| 173 | } else { /* v1.3 */ |
| 174 | localmtu = ETH_FRAME_LEN + VLAN_HLEN; |
| 175 | } |
| 176 | port->rmtu = localmtu; |
| 177 | |
| 178 | /* for version >= 1.6, ACK packet mode we support */ |
| 179 | if (vio_version_after_eq(vio, 1, 6)) { |
| 180 | pkt->xfer_mode = VIO_NEW_DRING_MODE; |
| 181 | pkt->options = VIO_TX_DRING; |
| 182 | } |
| 183 | |
| 184 | if (!(xfer_mode | VIO_NEW_DRING_MODE) || |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 185 | pkt->addr_type != VNET_ADDR_ETHERMAC || |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 186 | pkt->mtu != localmtu) { |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 187 | viodbg(HS, "SEND NET ATTR NACK\n"); |
| 188 | |
| 189 | pkt->tag.stype = VIO_SUBTYPE_NACK; |
| 190 | |
| 191 | (void) vio_ldc_send(vio, pkt, sizeof(*pkt)); |
| 192 | |
| 193 | return -ECONNRESET; |
| 194 | } else { |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 195 | viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] " |
| 196 | "addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] " |
| 197 | "mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n", |
| 198 | pkt->xfer_mode, pkt->addr_type, |
| 199 | (unsigned long long)pkt->addr, |
| 200 | pkt->ack_freq, pkt->plnk_updt, pkt->options, |
| 201 | (unsigned long long)pkt->mtu, port->rmtu, pkt->cflags, |
| 202 | pkt->ipv4_lso_maxlen); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 203 | |
| 204 | pkt->tag.stype = VIO_SUBTYPE_ACK; |
| 205 | |
| 206 | return vio_ldc_send(vio, pkt, sizeof(*pkt)); |
| 207 | } |
| 208 | |
| 209 | } |
| 210 | |
| 211 | static int handle_attr_ack(struct vio_driver_state *vio, |
| 212 | struct vio_net_attr_info *pkt) |
| 213 | { |
| 214 | viodbg(HS, "GOT NET ATTR ACK\n"); |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static int handle_attr_nack(struct vio_driver_state *vio, |
| 220 | struct vio_net_attr_info *pkt) |
| 221 | { |
| 222 | viodbg(HS, "GOT NET ATTR NACK\n"); |
| 223 | |
| 224 | return -ECONNRESET; |
| 225 | } |
| 226 | |
| 227 | static int vnet_handle_attr(struct vio_driver_state *vio, void *arg) |
| 228 | { |
| 229 | struct vio_net_attr_info *pkt = arg; |
| 230 | |
| 231 | switch (pkt->tag.stype) { |
| 232 | case VIO_SUBTYPE_INFO: |
| 233 | return handle_attr_info(vio, pkt); |
| 234 | |
| 235 | case VIO_SUBTYPE_ACK: |
| 236 | return handle_attr_ack(vio, pkt); |
| 237 | |
| 238 | case VIO_SUBTYPE_NACK: |
| 239 | return handle_attr_nack(vio, pkt); |
| 240 | |
| 241 | default: |
| 242 | return -ECONNRESET; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | static void vnet_handshake_complete(struct vio_driver_state *vio) |
| 247 | { |
| 248 | struct vio_dring_state *dr; |
| 249 | |
| 250 | dr = &vio->drings[VIO_DRIVER_RX_RING]; |
| 251 | dr->snd_nxt = dr->rcv_nxt = 1; |
| 252 | |
| 253 | dr = &vio->drings[VIO_DRIVER_TX_RING]; |
| 254 | dr->snd_nxt = dr->rcv_nxt = 1; |
| 255 | } |
| 256 | |
| 257 | /* The hypervisor interface that implements copying to/from imported |
| 258 | * memory from another domain requires that copies are done to 8-byte |
| 259 | * aligned buffers, and that the lengths of such copies are also 8-byte |
| 260 | * multiples. |
| 261 | * |
| 262 | * So we align skb->data to an 8-byte multiple and pad-out the data |
| 263 | * area so we can round the copy length up to the next multiple of |
| 264 | * 8 for the copy. |
| 265 | * |
| 266 | * The transmitter puts the actual start of the packet 6 bytes into |
| 267 | * the buffer it sends over, so that the IP headers after the ethernet |
| 268 | * header are aligned properly. These 6 bytes are not in the descriptor |
| 269 | * length, they are simply implied. This offset is represented using |
| 270 | * the VNET_PACKET_SKIP macro. |
| 271 | */ |
| 272 | static struct sk_buff *alloc_and_align_skb(struct net_device *dev, |
| 273 | unsigned int len) |
| 274 | { |
| 275 | struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8); |
| 276 | unsigned long addr, off; |
| 277 | |
| 278 | if (unlikely(!skb)) |
| 279 | return NULL; |
| 280 | |
| 281 | addr = (unsigned long) skb->data; |
| 282 | off = ((addr + 7UL) & ~7UL) - addr; |
| 283 | if (off) |
| 284 | skb_reserve(skb, off); |
| 285 | |
| 286 | return skb; |
| 287 | } |
| 288 | |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 289 | static inline void vnet_fullcsum(struct sk_buff *skb) |
| 290 | { |
| 291 | struct iphdr *iph = ip_hdr(skb); |
| 292 | int offset = skb_transport_offset(skb); |
| 293 | |
| 294 | if (skb->protocol != htons(ETH_P_IP)) |
| 295 | return; |
| 296 | if (iph->protocol != IPPROTO_TCP && |
| 297 | iph->protocol != IPPROTO_UDP) |
| 298 | return; |
| 299 | skb->ip_summed = CHECKSUM_NONE; |
| 300 | skb->csum_level = 1; |
| 301 | skb->csum = 0; |
| 302 | if (iph->protocol == IPPROTO_TCP) { |
| 303 | struct tcphdr *ptcp = tcp_hdr(skb); |
| 304 | |
| 305 | ptcp->check = 0; |
| 306 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 307 | ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 308 | skb->len - offset, IPPROTO_TCP, |
| 309 | skb->csum); |
| 310 | } else if (iph->protocol == IPPROTO_UDP) { |
| 311 | struct udphdr *pudp = udp_hdr(skb); |
| 312 | |
| 313 | pudp->check = 0; |
| 314 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 315 | pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 316 | skb->len - offset, IPPROTO_UDP, |
| 317 | skb->csum); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 322 | { |
| 323 | struct net_device *dev = port->vp->dev; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 324 | unsigned int len = desc->size; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 325 | unsigned int copy_len; |
| 326 | struct sk_buff *skb; |
| 327 | int err; |
| 328 | |
| 329 | err = -EMSGSIZE; |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 330 | if (unlikely(len < ETH_ZLEN || len > port->rmtu)) { |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 331 | dev->stats.rx_length_errors++; |
| 332 | goto out_dropped; |
| 333 | } |
| 334 | |
| 335 | skb = alloc_and_align_skb(dev, len); |
| 336 | err = -ENOMEM; |
| 337 | if (unlikely(!skb)) { |
| 338 | dev->stats.rx_missed_errors++; |
| 339 | goto out_dropped; |
| 340 | } |
| 341 | |
| 342 | copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U; |
| 343 | skb_put(skb, copy_len); |
| 344 | err = ldc_copy(port->vio.lp, LDC_COPY_IN, |
| 345 | skb->data, copy_len, 0, |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 346 | desc->cookies, desc->ncookies); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 347 | if (unlikely(err < 0)) { |
| 348 | dev->stats.rx_frame_errors++; |
| 349 | goto out_free_skb; |
| 350 | } |
| 351 | |
| 352 | skb_pull(skb, VNET_PACKET_SKIP); |
| 353 | skb_trim(skb, len); |
| 354 | skb->protocol = eth_type_trans(skb, dev); |
| 355 | |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 356 | if (vio_version_after_eq(&port->vio, 1, 8)) { |
| 357 | struct vio_net_dext *dext = vio_net_ext(desc); |
| 358 | |
| 359 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) { |
| 360 | if (skb->protocol == ETH_P_IP) { |
| 361 | struct iphdr *iph = (struct iphdr *)skb->data; |
| 362 | |
| 363 | iph->check = 0; |
| 364 | ip_send_check(iph); |
| 365 | } |
| 366 | } |
| 367 | if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) && |
| 368 | skb->ip_summed == CHECKSUM_NONE) |
| 369 | vnet_fullcsum(skb); |
| 370 | if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) { |
| 371 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 372 | skb->csum_level = 0; |
| 373 | if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK) |
| 374 | skb->csum_level = 1; |
| 375 | } |
| 376 | } |
| 377 | |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 378 | skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL; |
| 379 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 380 | dev->stats.rx_packets++; |
| 381 | dev->stats.rx_bytes += len; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 382 | napi_gro_receive(&port->napi, skb); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 383 | return 0; |
| 384 | |
| 385 | out_free_skb: |
| 386 | kfree_skb(skb); |
| 387 | |
| 388 | out_dropped: |
| 389 | dev->stats.rx_dropped++; |
| 390 | return err; |
| 391 | } |
| 392 | |
| 393 | static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr, |
| 394 | u32 start, u32 end, u8 vio_dring_state) |
| 395 | { |
| 396 | struct vio_dring_data hdr = { |
| 397 | .tag = { |
| 398 | .type = VIO_TYPE_DATA, |
| 399 | .stype = VIO_SUBTYPE_ACK, |
| 400 | .stype_env = VIO_DRING_DATA, |
| 401 | .sid = vio_send_sid(&port->vio), |
| 402 | }, |
| 403 | .dring_ident = dr->ident, |
| 404 | .start_idx = start, |
| 405 | .end_idx = end, |
| 406 | .state = vio_dring_state, |
| 407 | }; |
| 408 | int err, delay; |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 409 | int retries = 0; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 410 | |
| 411 | hdr.seq = dr->snd_nxt; |
| 412 | delay = 1; |
| 413 | do { |
| 414 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
| 415 | if (err > 0) { |
| 416 | dr->snd_nxt++; |
| 417 | break; |
| 418 | } |
| 419 | udelay(delay); |
| 420 | if ((delay <<= 1) > 128) |
| 421 | delay = 128; |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 422 | if (retries++ > VNET_MAX_RETRIES) { |
| 423 | pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n", |
| 424 | port->raddr[0], port->raddr[1], |
| 425 | port->raddr[2], port->raddr[3], |
| 426 | port->raddr[4], port->raddr[5]); |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 427 | break; |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 428 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 429 | } while (err == -EAGAIN); |
| 430 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 431 | if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) { |
| 432 | port->stop_rx_idx = end; |
| 433 | port->stop_rx = true; |
| 434 | } else { |
| 435 | port->stop_rx_idx = 0; |
| 436 | port->stop_rx = false; |
| 437 | } |
| 438 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 439 | return err; |
| 440 | } |
| 441 | |
| 442 | static u32 next_idx(u32 idx, struct vio_dring_state *dr) |
| 443 | { |
| 444 | if (++idx == dr->num_entries) |
| 445 | idx = 0; |
| 446 | return idx; |
| 447 | } |
| 448 | |
| 449 | static u32 prev_idx(u32 idx, struct vio_dring_state *dr) |
| 450 | { |
| 451 | if (idx == 0) |
| 452 | idx = dr->num_entries - 1; |
| 453 | else |
| 454 | idx--; |
| 455 | |
| 456 | return idx; |
| 457 | } |
| 458 | |
| 459 | static struct vio_net_desc *get_rx_desc(struct vnet_port *port, |
| 460 | struct vio_dring_state *dr, |
| 461 | u32 index) |
| 462 | { |
| 463 | struct vio_net_desc *desc = port->vio.desc_buf; |
| 464 | int err; |
| 465 | |
| 466 | err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size, |
| 467 | (index * dr->entry_size), |
| 468 | dr->cookies, dr->ncookies); |
| 469 | if (err < 0) |
| 470 | return ERR_PTR(err); |
| 471 | |
| 472 | return desc; |
| 473 | } |
| 474 | |
| 475 | static int put_rx_desc(struct vnet_port *port, |
| 476 | struct vio_dring_state *dr, |
| 477 | struct vio_net_desc *desc, |
| 478 | u32 index) |
| 479 | { |
| 480 | int err; |
| 481 | |
| 482 | err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size, |
| 483 | (index * dr->entry_size), |
| 484 | dr->cookies, dr->ncookies); |
| 485 | if (err < 0) |
| 486 | return err; |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | static int vnet_walk_rx_one(struct vnet_port *port, |
| 492 | struct vio_dring_state *dr, |
| 493 | u32 index, int *needs_ack) |
| 494 | { |
| 495 | struct vio_net_desc *desc = get_rx_desc(port, dr, index); |
| 496 | struct vio_driver_state *vio = &port->vio; |
| 497 | int err; |
| 498 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 499 | BUG_ON(desc == NULL); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 500 | if (IS_ERR(desc)) |
| 501 | return PTR_ERR(desc); |
| 502 | |
David L Stevens | 78dcff7 | 2014-09-08 16:23:01 -0400 | [diff] [blame] | 503 | if (desc->hdr.state != VIO_DESC_READY) |
| 504 | return 1; |
| 505 | |
| 506 | rmb(); |
| 507 | |
Sam Ravnborg | 3f4528d | 2009-01-06 13:20:38 -0800 | [diff] [blame] | 508 | viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 509 | desc->hdr.state, desc->hdr.ack, |
| 510 | desc->size, desc->ncookies, |
| 511 | desc->cookies[0].cookie_addr, |
| 512 | desc->cookies[0].cookie_size); |
| 513 | |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 514 | err = vnet_rx_one(port, desc); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 515 | if (err == -ECONNRESET) |
| 516 | return err; |
| 517 | desc->hdr.state = VIO_DESC_DONE; |
| 518 | err = put_rx_desc(port, dr, desc, index); |
| 519 | if (err < 0) |
| 520 | return err; |
| 521 | *needs_ack = desc->hdr.ack; |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr, |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 526 | u32 start, u32 end, int *npkts, int budget) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 527 | { |
| 528 | struct vio_driver_state *vio = &port->vio; |
| 529 | int ack_start = -1, ack_end = -1; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 530 | bool send_ack = true; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 531 | |
| 532 | end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr); |
| 533 | |
| 534 | viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end); |
| 535 | |
| 536 | while (start != end) { |
| 537 | int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack); |
| 538 | if (err == -ECONNRESET) |
| 539 | return err; |
| 540 | if (err != 0) |
| 541 | break; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 542 | (*npkts)++; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 543 | if (ack_start == -1) |
| 544 | ack_start = start; |
| 545 | ack_end = start; |
| 546 | start = next_idx(start, dr); |
| 547 | if (ack && start != end) { |
| 548 | err = vnet_send_ack(port, dr, ack_start, ack_end, |
| 549 | VIO_DRING_ACTIVE); |
| 550 | if (err == -ECONNRESET) |
| 551 | return err; |
| 552 | ack_start = -1; |
| 553 | } |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 554 | if ((*npkts) >= budget) { |
| 555 | send_ack = false; |
| 556 | break; |
| 557 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 558 | } |
| 559 | if (unlikely(ack_start == -1)) |
| 560 | ack_start = ack_end = prev_idx(start, dr); |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 561 | if (send_ack) { |
| 562 | port->napi_resume = false; |
| 563 | return vnet_send_ack(port, dr, ack_start, ack_end, |
| 564 | VIO_DRING_STOPPED); |
| 565 | } else { |
| 566 | port->napi_resume = true; |
| 567 | port->napi_stop_idx = ack_end; |
| 568 | return 1; |
| 569 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 570 | } |
| 571 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 572 | static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts, |
| 573 | int budget) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 574 | { |
| 575 | struct vio_dring_data *pkt = msgbuf; |
| 576 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING]; |
| 577 | struct vio_driver_state *vio = &port->vio; |
| 578 | |
Sam Ravnborg | 3f4528d | 2009-01-06 13:20:38 -0800 | [diff] [blame] | 579 | viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 580 | pkt->tag.stype_env, pkt->seq, dr->rcv_nxt); |
| 581 | |
| 582 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) |
| 583 | return 0; |
| 584 | if (unlikely(pkt->seq != dr->rcv_nxt)) { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 585 | pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n", |
| 586 | pkt->seq, dr->rcv_nxt); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 587 | return 0; |
| 588 | } |
| 589 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 590 | if (!port->napi_resume) |
| 591 | dr->rcv_nxt++; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 592 | |
| 593 | /* XXX Validate pkt->start_idx and pkt->end_idx XXX */ |
| 594 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 595 | return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx, |
| 596 | npkts, budget); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | static int idx_is_pending(struct vio_dring_state *dr, u32 end) |
| 600 | { |
| 601 | u32 idx = dr->cons; |
| 602 | int found = 0; |
| 603 | |
| 604 | while (idx != dr->prod) { |
| 605 | if (idx == end) { |
| 606 | found = 1; |
| 607 | break; |
| 608 | } |
| 609 | idx = next_idx(idx, dr); |
| 610 | } |
| 611 | return found; |
| 612 | } |
| 613 | |
| 614 | static int vnet_ack(struct vnet_port *port, void *msgbuf) |
| 615 | { |
| 616 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 617 | struct vio_dring_data *pkt = msgbuf; |
| 618 | struct net_device *dev; |
| 619 | struct vnet *vp; |
| 620 | u32 end; |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 621 | struct vio_net_desc *desc; |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 622 | struct netdev_queue *txq; |
| 623 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 624 | if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA)) |
| 625 | return 0; |
| 626 | |
| 627 | end = pkt->end_idx; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 628 | vp = port->vp; |
| 629 | dev = vp->dev; |
Sowmini Varadhan | b0cffed | 2014-11-08 20:41:53 -0500 | [diff] [blame] | 630 | netif_tx_lock(dev); |
| 631 | if (unlikely(!idx_is_pending(dr, end))) { |
| 632 | netif_tx_unlock(dev); |
| 633 | return 0; |
| 634 | } |
| 635 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 636 | /* sync for race conditions with vnet_start_xmit() and tell xmit it |
| 637 | * is time to send a trigger. |
| 638 | */ |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 639 | dr->cons = next_idx(end, dr); |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 640 | desc = vio_dring_entry(dr, dr->cons); |
Sowmini Varadhan | 777362d | 2014-11-08 20:42:10 -0500 | [diff] [blame] | 641 | if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) { |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 642 | /* vnet_start_xmit() just populated this dring but missed |
| 643 | * sending the "start" LDC message to the consumer. |
| 644 | * Send a "start" trigger on its behalf. |
| 645 | */ |
| 646 | if (__vnet_tx_trigger(port, dr->cons) > 0) |
| 647 | port->start_cons = false; |
| 648 | else |
| 649 | port->start_cons = true; |
| 650 | } else { |
| 651 | port->start_cons = true; |
| 652 | } |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 653 | netif_tx_unlock(dev); |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 654 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 655 | txq = netdev_get_tx_queue(dev, port->q_index); |
| 656 | if (unlikely(netif_tx_queue_stopped(txq) && |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 657 | vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr))) |
| 658 | return 1; |
| 659 | |
| 660 | return 0; |
| 661 | } |
| 662 | |
| 663 | static int vnet_nack(struct vnet_port *port, void *msgbuf) |
| 664 | { |
| 665 | /* XXX just reset or similar XXX */ |
| 666 | return 0; |
| 667 | } |
| 668 | |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 669 | static int handle_mcast(struct vnet_port *port, void *msgbuf) |
| 670 | { |
| 671 | struct vio_net_mcast_info *pkt = msgbuf; |
| 672 | |
| 673 | if (pkt->tag.stype != VIO_SUBTYPE_ACK) |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 674 | pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n", |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 675 | port->vp->dev->name, |
| 676 | pkt->tag.type, |
| 677 | pkt->tag.stype, |
| 678 | pkt->tag.stype_env, |
| 679 | pkt->tag.sid); |
| 680 | |
| 681 | return 0; |
| 682 | } |
| 683 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 684 | /* Got back a STOPPED LDC message on port. If the queue is stopped, |
| 685 | * wake it up so that we'll send out another START message at the |
| 686 | * next TX. |
| 687 | */ |
| 688 | static void maybe_tx_wakeup(struct vnet_port *port) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 689 | { |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 690 | struct netdev_queue *txq; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 691 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 692 | txq = netdev_get_tx_queue(port->vp->dev, port->q_index); |
| 693 | __netif_tx_lock(txq, smp_processor_id()); |
| 694 | if (likely(netif_tx_queue_stopped(txq))) { |
| 695 | struct vio_dring_state *dr; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 696 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 697 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
Sowmini Varadhan | 6c3ce8a | 2014-11-06 14:51:02 -0500 | [diff] [blame] | 698 | netif_tx_wake_queue(txq); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 699 | } |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 700 | __netif_tx_unlock(txq); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 701 | } |
| 702 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 703 | static inline bool port_is_up(struct vnet_port *vnet) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 704 | { |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 705 | struct vio_driver_state *vio = &vnet->vio; |
| 706 | |
| 707 | return !!(vio->hs_state & VIO_HS_COMPLETE); |
| 708 | } |
| 709 | |
| 710 | static int vnet_event_napi(struct vnet_port *port, int budget) |
| 711 | { |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 712 | struct vio_driver_state *vio = &port->vio; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 713 | int tx_wakeup, err; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 714 | int npkts = 0; |
| 715 | int event = (port->rx_event & LDC_EVENT_RESET); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 716 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 717 | ldc_ctrl: |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 718 | if (unlikely(event == LDC_EVENT_RESET || |
| 719 | event == LDC_EVENT_UP)) { |
| 720 | vio_link_state_change(vio, event); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 721 | |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 722 | if (event == LDC_EVENT_RESET) { |
| 723 | port->rmtu = 0; |
David S. Miller | d762acd | 2007-07-18 00:07:39 -0700 | [diff] [blame] | 724 | vio_port_up(vio); |
David L Stevens | e4defc7 | 2014-09-29 19:47:59 -0400 | [diff] [blame] | 725 | } |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 726 | port->rx_event = 0; |
| 727 | return 0; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 728 | } |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 729 | /* We may have multiple LDC events in rx_event. Unroll send_events() */ |
| 730 | event = (port->rx_event & LDC_EVENT_UP); |
| 731 | port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP); |
| 732 | if (event == LDC_EVENT_UP) |
| 733 | goto ldc_ctrl; |
| 734 | event = port->rx_event; |
| 735 | if (!(event & LDC_EVENT_DATA_READY)) |
| 736 | return 0; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 737 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 738 | /* we dont expect any other bits than RESET, UP, DATA_READY */ |
| 739 | BUG_ON(event != LDC_EVENT_DATA_READY); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 740 | |
| 741 | tx_wakeup = err = 0; |
| 742 | while (1) { |
| 743 | union { |
| 744 | struct vio_msg_tag tag; |
| 745 | u64 raw[8]; |
| 746 | } msgbuf; |
| 747 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 748 | if (port->napi_resume) { |
| 749 | struct vio_dring_data *pkt = |
| 750 | (struct vio_dring_data *)&msgbuf; |
| 751 | struct vio_dring_state *dr = |
| 752 | &port->vio.drings[VIO_DRIVER_RX_RING]; |
| 753 | |
| 754 | pkt->tag.type = VIO_TYPE_DATA; |
| 755 | pkt->tag.stype = VIO_SUBTYPE_INFO; |
| 756 | pkt->tag.stype_env = VIO_DRING_DATA; |
| 757 | pkt->seq = dr->rcv_nxt; |
| 758 | pkt->start_idx = next_idx(port->napi_stop_idx, dr); |
| 759 | pkt->end_idx = -1; |
| 760 | goto napi_resume; |
| 761 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 762 | err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf)); |
| 763 | if (unlikely(err < 0)) { |
| 764 | if (err == -ECONNRESET) |
| 765 | vio_conn_reset(vio); |
| 766 | break; |
| 767 | } |
| 768 | if (err == 0) |
| 769 | break; |
| 770 | viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n", |
| 771 | msgbuf.tag.type, |
| 772 | msgbuf.tag.stype, |
| 773 | msgbuf.tag.stype_env, |
| 774 | msgbuf.tag.sid); |
| 775 | err = vio_validate_sid(vio, &msgbuf.tag); |
| 776 | if (err < 0) |
| 777 | break; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 778 | napi_resume: |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 779 | if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) { |
| 780 | if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) { |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 781 | if (!port_is_up(port)) { |
| 782 | /* failures like handshake_failure() |
| 783 | * may have cleaned up dring, but |
| 784 | * NAPI polling may bring us here. |
| 785 | */ |
| 786 | err = -ECONNRESET; |
| 787 | break; |
| 788 | } |
| 789 | err = vnet_rx(port, &msgbuf, &npkts, budget); |
| 790 | if (npkts >= budget) |
| 791 | break; |
Sowmini Varadhan | 8c4ee3e | 2014-11-06 14:51:08 -0500 | [diff] [blame] | 792 | if (npkts == 0) |
| 793 | break; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 794 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) { |
| 795 | err = vnet_ack(port, &msgbuf); |
| 796 | if (err > 0) |
| 797 | tx_wakeup |= err; |
| 798 | } else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) { |
| 799 | err = vnet_nack(port, &msgbuf); |
| 800 | } |
| 801 | } else if (msgbuf.tag.type == VIO_TYPE_CTRL) { |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 802 | if (msgbuf.tag.stype_env == VNET_MCAST_INFO) |
| 803 | err = handle_mcast(port, &msgbuf); |
| 804 | else |
| 805 | err = vio_control_pkt_engine(vio, &msgbuf); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 806 | if (err) |
| 807 | break; |
| 808 | } else { |
| 809 | err = vnet_handle_unknown(port, &msgbuf); |
| 810 | } |
| 811 | if (err == -ECONNRESET) |
| 812 | break; |
| 813 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 814 | if (unlikely(tx_wakeup && err != -ECONNRESET)) |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 815 | maybe_tx_wakeup(port); |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 816 | return npkts; |
| 817 | } |
Sowmini Varadhan | 1d311ad | 2014-08-13 10:29:41 -0400 | [diff] [blame] | 818 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 819 | static int vnet_poll(struct napi_struct *napi, int budget) |
| 820 | { |
| 821 | struct vnet_port *port = container_of(napi, struct vnet_port, napi); |
| 822 | struct vio_driver_state *vio = &port->vio; |
| 823 | int processed = vnet_event_napi(port, budget); |
| 824 | |
| 825 | if (processed < budget) { |
| 826 | napi_complete(napi); |
Sowmini Varadhan | 7bd68bf | 2014-10-30 12:45:58 -0400 | [diff] [blame] | 827 | port->rx_event &= ~LDC_EVENT_DATA_READY; |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 828 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED); |
| 829 | } |
| 830 | return processed; |
| 831 | } |
| 832 | |
| 833 | static void vnet_event(void *arg, int event) |
| 834 | { |
| 835 | struct vnet_port *port = arg; |
| 836 | struct vio_driver_state *vio = &port->vio; |
| 837 | |
| 838 | port->rx_event |= event; |
| 839 | vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED); |
| 840 | napi_schedule(&port->napi); |
| 841 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 842 | } |
| 843 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 844 | static int __vnet_tx_trigger(struct vnet_port *port, u32 start) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 845 | { |
| 846 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 847 | struct vio_dring_data hdr = { |
| 848 | .tag = { |
| 849 | .type = VIO_TYPE_DATA, |
| 850 | .stype = VIO_SUBTYPE_INFO, |
| 851 | .stype_env = VIO_DRING_DATA, |
| 852 | .sid = vio_send_sid(&port->vio), |
| 853 | }, |
| 854 | .dring_ident = dr->ident, |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 855 | .start_idx = start, |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 856 | .end_idx = (u32) -1, |
| 857 | }; |
| 858 | int err, delay; |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 859 | int retries = 0; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 860 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 861 | if (port->stop_rx) { |
| 862 | err = vnet_send_ack(port, |
| 863 | &port->vio.drings[VIO_DRIVER_RX_RING], |
| 864 | port->stop_rx_idx, -1, |
| 865 | VIO_DRING_STOPPED); |
| 866 | if (err <= 0) |
| 867 | return err; |
| 868 | } |
| 869 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 870 | hdr.seq = dr->snd_nxt; |
| 871 | delay = 1; |
| 872 | do { |
| 873 | err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr)); |
| 874 | if (err > 0) { |
| 875 | dr->snd_nxt++; |
| 876 | break; |
| 877 | } |
| 878 | udelay(delay); |
| 879 | if ((delay <<= 1) > 128) |
| 880 | delay = 128; |
Sowmini Varadhan | adddc32 | 2014-08-12 10:33:10 -0400 | [diff] [blame] | 881 | if (retries++ > VNET_MAX_RETRIES) |
| 882 | break; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 883 | } while (err == -EAGAIN); |
| 884 | |
| 885 | return err; |
| 886 | } |
| 887 | |
| 888 | struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb) |
| 889 | { |
| 890 | unsigned int hash = vnet_hashfn(skb->data); |
| 891 | struct hlist_head *hp = &vp->port_hash[hash]; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 892 | struct vnet_port *port; |
| 893 | |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 894 | hlist_for_each_entry_rcu(port, hp, hash) { |
David L Stevens | 8266f5f | 2014-07-25 10:30:11 -0400 | [diff] [blame] | 895 | if (!port_is_up(port)) |
| 896 | continue; |
Joe Perches | 2e42e47 | 2012-05-09 17:17:46 +0000 | [diff] [blame] | 897 | if (ether_addr_equal(port->raddr, skb->data)) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 898 | return port; |
| 899 | } |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 900 | list_for_each_entry_rcu(port, &vp->port_list, list) { |
David L Stevens | 8266f5f | 2014-07-25 10:30:11 -0400 | [diff] [blame] | 901 | if (!port->switch_port) |
| 902 | continue; |
| 903 | if (!port_is_up(port)) |
| 904 | continue; |
| 905 | return port; |
| 906 | } |
| 907 | return NULL; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 908 | } |
| 909 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 910 | static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port, |
| 911 | unsigned *pending) |
| 912 | { |
| 913 | struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 914 | struct sk_buff *skb = NULL; |
| 915 | int i, txi; |
| 916 | |
| 917 | *pending = 0; |
| 918 | |
| 919 | txi = dr->prod-1; |
| 920 | if (txi < 0) |
| 921 | txi = VNET_TX_RING_SIZE-1; |
| 922 | |
| 923 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
| 924 | struct vio_net_desc *d; |
| 925 | |
| 926 | d = vio_dring_entry(dr, txi); |
| 927 | |
| 928 | if (d->hdr.state == VIO_DESC_DONE) { |
| 929 | if (port->tx_bufs[txi].skb) { |
| 930 | BUG_ON(port->tx_bufs[txi].skb->next); |
| 931 | |
| 932 | port->tx_bufs[txi].skb->next = skb; |
| 933 | skb = port->tx_bufs[txi].skb; |
| 934 | port->tx_bufs[txi].skb = NULL; |
| 935 | |
| 936 | ldc_unmap(port->vio.lp, |
| 937 | port->tx_bufs[txi].cookies, |
| 938 | port->tx_bufs[txi].ncookies); |
| 939 | } |
| 940 | d->hdr.state = VIO_DESC_FREE; |
| 941 | } else if (d->hdr.state == VIO_DESC_READY) { |
| 942 | (*pending)++; |
| 943 | } else if (d->hdr.state == VIO_DESC_FREE) { |
| 944 | break; |
| 945 | } |
| 946 | --txi; |
| 947 | if (txi < 0) |
| 948 | txi = VNET_TX_RING_SIZE-1; |
| 949 | } |
| 950 | return skb; |
| 951 | } |
| 952 | |
| 953 | static inline void vnet_free_skbs(struct sk_buff *skb) |
| 954 | { |
| 955 | struct sk_buff *next; |
| 956 | |
| 957 | while (skb) { |
| 958 | next = skb->next; |
| 959 | skb->next = NULL; |
| 960 | dev_kfree_skb(skb); |
| 961 | skb = next; |
| 962 | } |
| 963 | } |
| 964 | |
| 965 | static void vnet_clean_timer_expire(unsigned long port0) |
| 966 | { |
| 967 | struct vnet_port *port = (struct vnet_port *)port0; |
| 968 | struct sk_buff *freeskbs; |
| 969 | unsigned pending; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 970 | |
Sowmini Varadhan | 13b13dd | 2014-10-25 15:12:31 -0400 | [diff] [blame] | 971 | netif_tx_lock(port->vp->dev); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 972 | freeskbs = vnet_clean_tx_ring(port, &pending); |
Sowmini Varadhan | 13b13dd | 2014-10-25 15:12:31 -0400 | [diff] [blame] | 973 | netif_tx_unlock(port->vp->dev); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 974 | |
| 975 | vnet_free_skbs(freeskbs); |
| 976 | |
| 977 | if (pending) |
| 978 | (void)mod_timer(&port->clean_timer, |
| 979 | jiffies + VNET_CLEAN_TIMEOUT); |
| 980 | else |
| 981 | del_timer(&port->clean_timer); |
| 982 | } |
| 983 | |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 984 | static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb, |
| 985 | struct ldc_trans_cookie *cookies, int ncookies, |
| 986 | unsigned int map_perm) |
| 987 | { |
| 988 | int i, nc, err, blen; |
| 989 | |
| 990 | /* header */ |
| 991 | blen = skb_headlen(skb); |
| 992 | if (blen < ETH_ZLEN) |
| 993 | blen = ETH_ZLEN; |
| 994 | blen += VNET_PACKET_SKIP; |
| 995 | blen += 8 - (blen & 7); |
| 996 | |
| 997 | err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies, |
| 998 | ncookies, map_perm); |
| 999 | if (err < 0) |
| 1000 | return err; |
| 1001 | nc = err; |
| 1002 | |
| 1003 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 1004 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; |
| 1005 | u8 *vaddr; |
| 1006 | |
| 1007 | if (nc < ncookies) { |
| 1008 | vaddr = kmap_atomic(skb_frag_page(f)); |
| 1009 | blen = skb_frag_size(f); |
| 1010 | blen += 8 - (blen & 7); |
| 1011 | err = ldc_map_single(lp, vaddr + f->page_offset, |
| 1012 | blen, cookies + nc, ncookies - nc, |
| 1013 | map_perm); |
| 1014 | kunmap_atomic(vaddr); |
| 1015 | } else { |
| 1016 | err = -EMSGSIZE; |
| 1017 | } |
| 1018 | |
| 1019 | if (err < 0) { |
| 1020 | ldc_unmap(lp, cookies, nc); |
| 1021 | return err; |
| 1022 | } |
| 1023 | nc += err; |
| 1024 | } |
| 1025 | return nc; |
| 1026 | } |
| 1027 | |
| 1028 | static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies) |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1029 | { |
| 1030 | struct sk_buff *nskb; |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1031 | int i, len, pad, docopy; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1032 | |
| 1033 | len = skb->len; |
| 1034 | pad = 0; |
| 1035 | if (len < ETH_ZLEN) { |
| 1036 | pad += ETH_ZLEN - skb->len; |
| 1037 | len += pad; |
| 1038 | } |
| 1039 | len += VNET_PACKET_SKIP; |
| 1040 | pad += 8 - (len & 7); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1041 | |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1042 | /* make sure we have enough cookies and alignment in every frag */ |
| 1043 | docopy = skb_shinfo(skb)->nr_frags >= ncookies; |
| 1044 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
| 1045 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; |
| 1046 | |
| 1047 | docopy |= f->page_offset & 7; |
| 1048 | } |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1049 | if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP || |
| 1050 | skb_tailroom(skb) < pad || |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1051 | skb_headroom(skb) < VNET_PACKET_SKIP || docopy) { |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 1052 | int start = 0, offset; |
| 1053 | __wsum csum; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1054 | |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1055 | len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN; |
| 1056 | nskb = alloc_and_align_skb(skb->dev, len); |
| 1057 | if (nskb == NULL) { |
| 1058 | dev_kfree_skb(skb); |
| 1059 | return NULL; |
| 1060 | } |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1061 | skb_reserve(nskb, VNET_PACKET_SKIP); |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1062 | |
| 1063 | nskb->protocol = skb->protocol; |
| 1064 | offset = skb_mac_header(skb) - skb->data; |
| 1065 | skb_set_mac_header(nskb, offset); |
| 1066 | offset = skb_network_header(skb) - skb->data; |
| 1067 | skb_set_network_header(nskb, offset); |
| 1068 | offset = skb_transport_header(skb) - skb->data; |
| 1069 | skb_set_transport_header(nskb, offset); |
| 1070 | |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 1071 | offset = 0; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1072 | nskb->csum_offset = skb->csum_offset; |
| 1073 | nskb->ip_summed = skb->ip_summed; |
| 1074 | |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 1075 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1076 | start = skb_checksum_start_offset(skb); |
| 1077 | if (start) { |
| 1078 | struct iphdr *iph = ip_hdr(nskb); |
| 1079 | int offset = start + nskb->csum_offset; |
| 1080 | |
| 1081 | if (skb_copy_bits(skb, 0, nskb->data, start)) { |
| 1082 | dev_kfree_skb(nskb); |
| 1083 | dev_kfree_skb(skb); |
| 1084 | return NULL; |
| 1085 | } |
| 1086 | *(__sum16 *)(skb->data + offset) = 0; |
| 1087 | csum = skb_copy_and_csum_bits(skb, start, |
| 1088 | nskb->data + start, |
| 1089 | skb->len - start, 0); |
| 1090 | if (iph->protocol == IPPROTO_TCP || |
| 1091 | iph->protocol == IPPROTO_UDP) { |
| 1092 | csum = csum_tcpudp_magic(iph->saddr, iph->daddr, |
| 1093 | skb->len - start, |
| 1094 | iph->protocol, csum); |
| 1095 | } |
| 1096 | *(__sum16 *)(nskb->data + offset) = csum; |
| 1097 | |
| 1098 | nskb->ip_summed = CHECKSUM_NONE; |
| 1099 | } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) { |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1100 | dev_kfree_skb(nskb); |
| 1101 | dev_kfree_skb(skb); |
| 1102 | return NULL; |
| 1103 | } |
| 1104 | (void)skb_put(nskb, skb->len); |
| 1105 | dev_kfree_skb(skb); |
| 1106 | skb = nskb; |
| 1107 | } |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1108 | return skb; |
| 1109 | } |
| 1110 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1111 | static u16 |
| 1112 | vnet_select_queue(struct net_device *dev, struct sk_buff *skb, |
| 1113 | void *accel_priv, select_queue_fallback_t fallback) |
| 1114 | { |
| 1115 | struct vnet *vp = netdev_priv(dev); |
| 1116 | struct vnet_port *port = __tx_port_find(vp, skb); |
| 1117 | |
David L Stevens | c647cc3 | 2014-11-12 10:58:47 -0500 | [diff] [blame] | 1118 | if (port == NULL) |
| 1119 | return 0; |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1120 | return port->q_index; |
| 1121 | } |
| 1122 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1123 | static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 1124 | { |
| 1125 | struct vnet *vp = netdev_priv(dev); |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1126 | struct vnet_port *port = NULL; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1127 | struct vio_dring_state *dr; |
| 1128 | struct vio_net_desc *d; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1129 | unsigned int len; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1130 | struct sk_buff *freeskbs = NULL; |
| 1131 | int i, err, txi; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1132 | unsigned pending = 0; |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1133 | struct netdev_queue *txq; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1134 | |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1135 | rcu_read_lock(); |
Sowmini Varadhan | 13b13dd | 2014-10-25 15:12:31 -0400 | [diff] [blame] | 1136 | port = __tx_port_find(vp, skb); |
Sowmini Varadhan | df20286 | 2014-11-08 20:42:20 -0500 | [diff] [blame] | 1137 | if (unlikely(!port)) { |
| 1138 | rcu_read_unlock(); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1139 | goto out_dropped; |
Sowmini Varadhan | df20286 | 2014-11-08 20:42:20 -0500 | [diff] [blame] | 1140 | } |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1141 | |
David L Stevens | a2b78e9 | 2014-09-29 19:48:24 -0400 | [diff] [blame] | 1142 | if (skb->len > port->rmtu) { |
| 1143 | unsigned long localmtu = port->rmtu - ETH_HLEN; |
| 1144 | |
| 1145 | if (vio_version_after_eq(&port->vio, 1, 3)) |
| 1146 | localmtu -= VLAN_HLEN; |
| 1147 | |
| 1148 | if (skb->protocol == htons(ETH_P_IP)) { |
| 1149 | struct flowi4 fl4; |
| 1150 | struct rtable *rt = NULL; |
| 1151 | |
| 1152 | memset(&fl4, 0, sizeof(fl4)); |
| 1153 | fl4.flowi4_oif = dev->ifindex; |
| 1154 | fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos); |
| 1155 | fl4.daddr = ip_hdr(skb)->daddr; |
| 1156 | fl4.saddr = ip_hdr(skb)->saddr; |
| 1157 | |
| 1158 | rt = ip_route_output_key(dev_net(dev), &fl4); |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1159 | rcu_read_unlock(); |
David L Stevens | a2b78e9 | 2014-09-29 19:48:24 -0400 | [diff] [blame] | 1160 | if (!IS_ERR(rt)) { |
| 1161 | skb_dst_set(skb, &rt->dst); |
| 1162 | icmp_send(skb, ICMP_DEST_UNREACH, |
| 1163 | ICMP_FRAG_NEEDED, |
| 1164 | htonl(localmtu)); |
| 1165 | } |
| 1166 | } |
| 1167 | #if IS_ENABLED(CONFIG_IPV6) |
| 1168 | else if (skb->protocol == htons(ETH_P_IPV6)) |
| 1169 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu); |
| 1170 | #endif |
David L Stevens | 42db672 | 2014-09-29 19:48:18 -0400 | [diff] [blame] | 1171 | goto out_dropped; |
David L Stevens | a2b78e9 | 2014-09-29 19:48:24 -0400 | [diff] [blame] | 1172 | } |
David L Stevens | 42db672 | 2014-09-29 19:48:18 -0400 | [diff] [blame] | 1173 | |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1174 | skb = vnet_skb_shape(skb, 2); |
| 1175 | |
| 1176 | if (unlikely(!skb)) { |
| 1177 | rcu_read_unlock(); |
| 1178 | goto out_dropped; |
| 1179 | } |
| 1180 | |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 1181 | if (skb->ip_summed == CHECKSUM_PARTIAL) |
| 1182 | vnet_fullcsum(skb); |
| 1183 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1184 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1185 | i = skb_get_queue_mapping(skb); |
| 1186 | txq = netdev_get_tx_queue(dev, i); |
Dwight Engen | d0aedcd | 2014-09-19 09:43:02 -0400 | [diff] [blame] | 1187 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1188 | if (!netif_tx_queue_stopped(txq)) { |
| 1189 | netif_tx_stop_queue(txq); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1190 | |
| 1191 | /* This is a hard error, log it. */ |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1192 | netdev_err(dev, "BUG! Tx Ring full when queue awake!\n"); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1193 | dev->stats.tx_errors++; |
| 1194 | } |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1195 | rcu_read_unlock(); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1196 | return NETDEV_TX_BUSY; |
| 1197 | } |
| 1198 | |
| 1199 | d = vio_dring_cur(dr); |
| 1200 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1201 | txi = dr->prod; |
| 1202 | |
| 1203 | freeskbs = vnet_clean_tx_ring(port, &pending); |
| 1204 | |
| 1205 | BUG_ON(port->tx_bufs[txi].skb); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1206 | |
| 1207 | len = skb->len; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1208 | if (len < ETH_ZLEN) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1209 | len = ETH_ZLEN; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1210 | |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1211 | err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2, |
| 1212 | (LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW)); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1213 | if (err < 0) { |
| 1214 | netdev_info(dev, "tx buffer map error %d\n", err); |
Sowmini Varadhan | 13b13dd | 2014-10-25 15:12:31 -0400 | [diff] [blame] | 1215 | goto out_dropped; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1216 | } |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1217 | |
| 1218 | port->tx_bufs[txi].skb = skb; |
| 1219 | skb = NULL; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1220 | port->tx_bufs[txi].ncookies = err; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1221 | |
Sowmini Varadhan | 1f6394e | 2014-08-12 10:27:24 -0400 | [diff] [blame] | 1222 | /* We don't rely on the ACKs to free the skb in vnet_start_xmit(), |
| 1223 | * thus it is safe to not set VIO_ACK_ENABLE for each transmission: |
| 1224 | * the protocol itself does not require it as long as the peer |
| 1225 | * sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED. |
| 1226 | * |
| 1227 | * An ACK for every packet in the ring is expensive as the |
| 1228 | * sending of LDC messages is slow and affects performance. |
| 1229 | */ |
| 1230 | d->hdr.ack = VIO_ACK_DISABLE; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1231 | d->size = len; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1232 | d->ncookies = port->tx_bufs[txi].ncookies; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1233 | for (i = 0; i < d->ncookies; i++) |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1234 | d->cookies[i] = port->tx_bufs[txi].cookies[i]; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1235 | if (vio_version_after_eq(&port->vio, 1, 7)) { |
| 1236 | struct vio_net_dext *dext = vio_net_ext(d); |
| 1237 | |
| 1238 | memset(dext, 0, sizeof(*dext)); |
| 1239 | if (vio_version_after_eq(&port->vio, 1, 8) && |
| 1240 | !port->switch_port) { |
| 1241 | dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK; |
| 1242 | dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK; |
| 1243 | } |
| 1244 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1245 | |
| 1246 | /* This has to be a non-SMP write barrier because we are writing |
| 1247 | * to memory which is shared with the peer LDOM. |
| 1248 | */ |
| 1249 | wmb(); |
| 1250 | |
| 1251 | d->hdr.state = VIO_DESC_READY; |
| 1252 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 1253 | /* Exactly one ldc "start" trigger (for dr->cons) needs to be sent |
| 1254 | * to notify the consumer that some descriptors are READY. |
| 1255 | * After that "start" trigger, no additional triggers are needed until |
| 1256 | * a DRING_STOPPED is received from the consumer. The dr->cons field |
| 1257 | * (set up by vnet_ack()) has the value of the next dring index |
| 1258 | * that has not yet been ack-ed. We send a "start" trigger here |
| 1259 | * if, and only if, start_cons is true (reset it afterward). Conversely, |
| 1260 | * vnet_ack() should check if the dring corresponding to cons |
| 1261 | * is marked READY, but start_cons was false. |
| 1262 | * If so, vnet_ack() should send out the missed "start" trigger. |
| 1263 | * |
| 1264 | * Note that the wmb() above makes sure the cookies et al. are |
| 1265 | * not globally visible before the VIO_DESC_READY, and that the |
| 1266 | * stores are ordered correctly by the compiler. The consumer will |
| 1267 | * not proceed until the VIO_DESC_READY is visible assuring that |
| 1268 | * the consumer does not observe anything related to descriptors |
| 1269 | * out of order. The HV trap from the LDC start trigger is the |
| 1270 | * producer to consumer announcement that work is available to the |
| 1271 | * consumer |
| 1272 | */ |
| 1273 | if (!port->start_cons) |
| 1274 | goto ldc_start_done; /* previous trigger suffices */ |
| 1275 | |
| 1276 | err = __vnet_tx_trigger(port, dr->cons); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1277 | if (unlikely(err < 0)) { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1278 | netdev_info(dev, "TX trigger error %d\n", err); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1279 | d->hdr.state = VIO_DESC_FREE; |
| 1280 | dev->stats.tx_carrier_errors++; |
Sowmini Varadhan | 13b13dd | 2014-10-25 15:12:31 -0400 | [diff] [blame] | 1281 | goto out_dropped; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1282 | } |
| 1283 | |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 1284 | ldc_start_done: |
| 1285 | port->start_cons = false; |
| 1286 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1287 | dev->stats.tx_packets++; |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1288 | dev->stats.tx_bytes += port->tx_bufs[txi].skb->len; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1289 | |
| 1290 | dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1); |
Dwight Engen | d0aedcd | 2014-09-19 09:43:02 -0400 | [diff] [blame] | 1291 | if (unlikely(vnet_tx_dring_avail(dr) < 1)) { |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1292 | netif_tx_stop_queue(txq); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1293 | if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr)) |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1294 | netif_tx_wake_queue(txq); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1295 | } |
| 1296 | |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1297 | (void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT); |
| 1298 | rcu_read_unlock(); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1299 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1300 | vnet_free_skbs(freeskbs); |
| 1301 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1302 | return NETDEV_TX_OK; |
| 1303 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1304 | out_dropped: |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1305 | if (pending) |
| 1306 | (void)mod_timer(&port->clean_timer, |
| 1307 | jiffies + VNET_CLEAN_TIMEOUT); |
David L Stevens | a29c9c4 | 2014-10-01 11:05:27 -0400 | [diff] [blame] | 1308 | else if (port) |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1309 | del_timer(&port->clean_timer); |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1310 | if (port) |
| 1311 | rcu_read_unlock(); |
| 1312 | if (skb) |
| 1313 | dev_kfree_skb(skb); |
| 1314 | vnet_free_skbs(freeskbs); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1315 | dev->stats.tx_dropped++; |
| 1316 | return NETDEV_TX_OK; |
| 1317 | } |
| 1318 | |
| 1319 | static void vnet_tx_timeout(struct net_device *dev) |
| 1320 | { |
| 1321 | /* XXX Implement me XXX */ |
| 1322 | } |
| 1323 | |
| 1324 | static int vnet_open(struct net_device *dev) |
| 1325 | { |
| 1326 | netif_carrier_on(dev); |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1327 | netif_tx_start_all_queues(dev); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1328 | |
| 1329 | return 0; |
| 1330 | } |
| 1331 | |
| 1332 | static int vnet_close(struct net_device *dev) |
| 1333 | { |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1334 | netif_tx_stop_all_queues(dev); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1335 | netif_carrier_off(dev); |
| 1336 | |
| 1337 | return 0; |
| 1338 | } |
| 1339 | |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1340 | static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr) |
| 1341 | { |
| 1342 | struct vnet_mcast_entry *m; |
| 1343 | |
| 1344 | for (m = vp->mcast_list; m; m = m->next) { |
dingtianhong | 00fa4ce | 2013-12-30 15:41:24 +0800 | [diff] [blame] | 1345 | if (ether_addr_equal(m->addr, addr)) |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1346 | return m; |
| 1347 | } |
| 1348 | return NULL; |
| 1349 | } |
| 1350 | |
| 1351 | static void __update_mc_list(struct vnet *vp, struct net_device *dev) |
| 1352 | { |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 1353 | struct netdev_hw_addr *ha; |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1354 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 1355 | netdev_for_each_mc_addr(ha, dev) { |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1356 | struct vnet_mcast_entry *m; |
| 1357 | |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 1358 | m = __vnet_mc_find(vp, ha->addr); |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1359 | if (m) { |
| 1360 | m->hit = 1; |
| 1361 | continue; |
| 1362 | } |
| 1363 | |
| 1364 | if (!m) { |
| 1365 | m = kzalloc(sizeof(*m), GFP_ATOMIC); |
| 1366 | if (!m) |
| 1367 | continue; |
Jiri Pirko | 22bedad3 | 2010-04-01 21:22:57 +0000 | [diff] [blame] | 1368 | memcpy(m->addr, ha->addr, ETH_ALEN); |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1369 | m->hit = 1; |
| 1370 | |
| 1371 | m->next = vp->mcast_list; |
| 1372 | vp->mcast_list = m; |
| 1373 | } |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | static void __send_mc_list(struct vnet *vp, struct vnet_port *port) |
| 1378 | { |
| 1379 | struct vio_net_mcast_info info; |
| 1380 | struct vnet_mcast_entry *m, **pp; |
| 1381 | int n_addrs; |
| 1382 | |
| 1383 | memset(&info, 0, sizeof(info)); |
| 1384 | |
| 1385 | info.tag.type = VIO_TYPE_CTRL; |
| 1386 | info.tag.stype = VIO_SUBTYPE_INFO; |
| 1387 | info.tag.stype_env = VNET_MCAST_INFO; |
| 1388 | info.tag.sid = vio_send_sid(&port->vio); |
| 1389 | info.set = 1; |
| 1390 | |
| 1391 | n_addrs = 0; |
| 1392 | for (m = vp->mcast_list; m; m = m->next) { |
| 1393 | if (m->sent) |
| 1394 | continue; |
| 1395 | m->sent = 1; |
| 1396 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], |
| 1397 | m->addr, ETH_ALEN); |
| 1398 | if (++n_addrs == VNET_NUM_MCAST) { |
| 1399 | info.count = n_addrs; |
| 1400 | |
| 1401 | (void) vio_ldc_send(&port->vio, &info, |
| 1402 | sizeof(info)); |
| 1403 | n_addrs = 0; |
| 1404 | } |
| 1405 | } |
| 1406 | if (n_addrs) { |
| 1407 | info.count = n_addrs; |
| 1408 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); |
| 1409 | } |
| 1410 | |
| 1411 | info.set = 0; |
| 1412 | |
| 1413 | n_addrs = 0; |
| 1414 | pp = &vp->mcast_list; |
| 1415 | while ((m = *pp) != NULL) { |
| 1416 | if (m->hit) { |
| 1417 | m->hit = 0; |
| 1418 | pp = &m->next; |
| 1419 | continue; |
| 1420 | } |
| 1421 | |
| 1422 | memcpy(&info.mcast_addr[n_addrs * ETH_ALEN], |
| 1423 | m->addr, ETH_ALEN); |
| 1424 | if (++n_addrs == VNET_NUM_MCAST) { |
| 1425 | info.count = n_addrs; |
| 1426 | (void) vio_ldc_send(&port->vio, &info, |
| 1427 | sizeof(info)); |
| 1428 | n_addrs = 0; |
| 1429 | } |
| 1430 | |
| 1431 | *pp = m->next; |
| 1432 | kfree(m); |
| 1433 | } |
| 1434 | if (n_addrs) { |
| 1435 | info.count = n_addrs; |
| 1436 | (void) vio_ldc_send(&port->vio, &info, sizeof(info)); |
| 1437 | } |
| 1438 | } |
| 1439 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1440 | static void vnet_set_rx_mode(struct net_device *dev) |
| 1441 | { |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1442 | struct vnet *vp = netdev_priv(dev); |
| 1443 | struct vnet_port *port; |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1444 | |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1445 | rcu_read_lock(); |
| 1446 | list_for_each_entry_rcu(port, &vp->port_list, list) { |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1447 | |
| 1448 | if (port->switch_port) { |
| 1449 | __update_mc_list(vp, dev); |
| 1450 | __send_mc_list(vp, port); |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1451 | break; |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1452 | } |
| 1453 | } |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1454 | rcu_read_unlock(); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1455 | } |
| 1456 | |
| 1457 | static int vnet_change_mtu(struct net_device *dev, int new_mtu) |
| 1458 | { |
David L Stevens | 42db672 | 2014-09-29 19:48:18 -0400 | [diff] [blame] | 1459 | if (new_mtu < 68 || new_mtu > 65535) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1460 | return -EINVAL; |
| 1461 | |
| 1462 | dev->mtu = new_mtu; |
| 1463 | return 0; |
| 1464 | } |
| 1465 | |
| 1466 | static int vnet_set_mac_addr(struct net_device *dev, void *p) |
| 1467 | { |
| 1468 | return -EINVAL; |
| 1469 | } |
| 1470 | |
| 1471 | static void vnet_get_drvinfo(struct net_device *dev, |
| 1472 | struct ethtool_drvinfo *info) |
| 1473 | { |
Jiri Pirko | 7826d43 | 2013-01-06 00:44:26 +0000 | [diff] [blame] | 1474 | strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver)); |
| 1475 | strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version)); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1476 | } |
| 1477 | |
| 1478 | static u32 vnet_get_msglevel(struct net_device *dev) |
| 1479 | { |
| 1480 | struct vnet *vp = netdev_priv(dev); |
| 1481 | return vp->msg_enable; |
| 1482 | } |
| 1483 | |
| 1484 | static void vnet_set_msglevel(struct net_device *dev, u32 value) |
| 1485 | { |
| 1486 | struct vnet *vp = netdev_priv(dev); |
| 1487 | vp->msg_enable = value; |
| 1488 | } |
| 1489 | |
| 1490 | static const struct ethtool_ops vnet_ethtool_ops = { |
| 1491 | .get_drvinfo = vnet_get_drvinfo, |
| 1492 | .get_msglevel = vnet_get_msglevel, |
| 1493 | .set_msglevel = vnet_set_msglevel, |
| 1494 | .get_link = ethtool_op_get_link, |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1495 | }; |
| 1496 | |
| 1497 | static void vnet_port_free_tx_bufs(struct vnet_port *port) |
| 1498 | { |
| 1499 | struct vio_dring_state *dr; |
| 1500 | int i; |
| 1501 | |
| 1502 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 1503 | if (dr->base) { |
| 1504 | ldc_free_exp_dring(port->vio.lp, dr->base, |
| 1505 | (dr->entry_size * dr->num_entries), |
| 1506 | dr->cookies, dr->ncookies); |
| 1507 | dr->base = NULL; |
| 1508 | dr->entry_size = 0; |
| 1509 | dr->num_entries = 0; |
| 1510 | dr->pending = 0; |
| 1511 | dr->ncookies = 0; |
| 1512 | } |
| 1513 | |
| 1514 | for (i = 0; i < VNET_TX_RING_SIZE; i++) { |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1515 | struct vio_net_desc *d; |
| 1516 | void *skb = port->tx_bufs[i].skb; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1517 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1518 | if (!skb) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1519 | continue; |
| 1520 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1521 | d = vio_dring_entry(dr, i); |
| 1522 | if (d->hdr.state == VIO_DESC_READY) |
| 1523 | pr_warn("active transmit buffers freed\n"); |
| 1524 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1525 | ldc_unmap(port->vio.lp, |
| 1526 | port->tx_bufs[i].cookies, |
| 1527 | port->tx_bufs[i].ncookies); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1528 | dev_kfree_skb(skb); |
| 1529 | port->tx_bufs[i].skb = NULL; |
| 1530 | d->hdr.state = VIO_DESC_FREE; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1531 | } |
| 1532 | } |
| 1533 | |
David L Stevens | d673248 | 2014-12-02 15:30:55 -0500 | [diff] [blame] | 1534 | static int vnet_port_alloc_tx_ring(struct vnet_port *port) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1535 | { |
| 1536 | struct vio_dring_state *dr; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1537 | unsigned long len, elen; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1538 | int i, err, ncookies; |
| 1539 | void *dring; |
| 1540 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1541 | dr = &port->vio.drings[VIO_DRIVER_TX_RING]; |
| 1542 | |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1543 | elen = sizeof(struct vio_net_desc) + |
| 1544 | sizeof(struct ldc_trans_cookie) * 2; |
| 1545 | if (vio_version_after_eq(&port->vio, 1, 7)) |
| 1546 | elen += sizeof(struct vio_net_dext); |
| 1547 | len = VNET_TX_RING_SIZE * elen; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1548 | |
| 1549 | ncookies = VIO_MAX_RING_COOKIES; |
| 1550 | dring = ldc_alloc_exp_dring(port->vio.lp, len, |
| 1551 | dr->cookies, &ncookies, |
| 1552 | (LDC_MAP_SHADOW | |
| 1553 | LDC_MAP_DIRECT | |
| 1554 | LDC_MAP_RW)); |
| 1555 | if (IS_ERR(dring)) { |
| 1556 | err = PTR_ERR(dring); |
| 1557 | goto err_out; |
| 1558 | } |
| 1559 | |
| 1560 | dr->base = dring; |
David L Stevens | 6d0ba91 | 2014-12-02 15:31:04 -0500 | [diff] [blame] | 1561 | dr->entry_size = elen; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1562 | dr->num_entries = VNET_TX_RING_SIZE; |
| 1563 | dr->prod = dr->cons = 0; |
Sowmini Varadhan | d101564 | 2014-09-11 09:57:22 -0400 | [diff] [blame] | 1564 | port->start_cons = true; /* need an initial trigger */ |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1565 | dr->pending = VNET_TX_RING_SIZE; |
| 1566 | dr->ncookies = ncookies; |
| 1567 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1568 | for (i = 0; i < VNET_TX_RING_SIZE; ++i) { |
| 1569 | struct vio_net_desc *d; |
| 1570 | |
| 1571 | d = vio_dring_entry(dr, i); |
| 1572 | d->hdr.state = VIO_DESC_FREE; |
| 1573 | } |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1574 | return 0; |
| 1575 | |
| 1576 | err_out: |
| 1577 | vnet_port_free_tx_bufs(port); |
| 1578 | |
| 1579 | return err; |
| 1580 | } |
| 1581 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1582 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1583 | static void vnet_poll_controller(struct net_device *dev) |
| 1584 | { |
| 1585 | struct vnet *vp = netdev_priv(dev); |
| 1586 | struct vnet_port *port; |
| 1587 | unsigned long flags; |
| 1588 | |
| 1589 | spin_lock_irqsave(&vp->lock, flags); |
| 1590 | if (!list_empty(&vp->port_list)) { |
| 1591 | port = list_entry(vp->port_list.next, struct vnet_port, list); |
| 1592 | napi_schedule(&port->napi); |
| 1593 | } |
| 1594 | spin_unlock_irqrestore(&vp->lock, flags); |
| 1595 | } |
| 1596 | #endif |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1597 | static LIST_HEAD(vnet_list); |
| 1598 | static DEFINE_MUTEX(vnet_list_mutex); |
| 1599 | |
David S. Miller | 8fd17f2 | 2009-03-20 00:51:22 -0700 | [diff] [blame] | 1600 | static const struct net_device_ops vnet_ops = { |
| 1601 | .ndo_open = vnet_open, |
| 1602 | .ndo_stop = vnet_close, |
Jiri Pirko | afc4b13 | 2011-08-16 06:29:01 +0000 | [diff] [blame] | 1603 | .ndo_set_rx_mode = vnet_set_rx_mode, |
David S. Miller | 8fd17f2 | 2009-03-20 00:51:22 -0700 | [diff] [blame] | 1604 | .ndo_set_mac_address = vnet_set_mac_addr, |
Ben Hutchings | 240c102 | 2009-07-09 17:54:35 +0000 | [diff] [blame] | 1605 | .ndo_validate_addr = eth_validate_addr, |
David S. Miller | 8fd17f2 | 2009-03-20 00:51:22 -0700 | [diff] [blame] | 1606 | .ndo_tx_timeout = vnet_tx_timeout, |
| 1607 | .ndo_change_mtu = vnet_change_mtu, |
| 1608 | .ndo_start_xmit = vnet_start_xmit, |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1609 | .ndo_select_queue = vnet_select_queue, |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1610 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1611 | .ndo_poll_controller = vnet_poll_controller, |
| 1612 | #endif |
David S. Miller | 8fd17f2 | 2009-03-20 00:51:22 -0700 | [diff] [blame] | 1613 | }; |
| 1614 | |
Bill Pemberton | f73d12b | 2012-12-03 09:24:02 -0500 | [diff] [blame] | 1615 | static struct vnet *vnet_new(const u64 *local_mac) |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1616 | { |
| 1617 | struct net_device *dev; |
| 1618 | struct vnet *vp; |
| 1619 | int err, i; |
| 1620 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1621 | dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1); |
Joe Perches | 41de8d4 | 2012-01-29 13:47:52 +0000 | [diff] [blame] | 1622 | if (!dev) |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1623 | return ERR_PTR(-ENOMEM); |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1624 | dev->needed_headroom = VNET_PACKET_SKIP + 8; |
| 1625 | dev->needed_tailroom = 8; |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1626 | |
| 1627 | for (i = 0; i < ETH_ALEN; i++) |
| 1628 | dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff; |
| 1629 | |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1630 | vp = netdev_priv(dev); |
| 1631 | |
| 1632 | spin_lock_init(&vp->lock); |
| 1633 | vp->dev = dev; |
| 1634 | |
| 1635 | INIT_LIST_HEAD(&vp->port_list); |
| 1636 | for (i = 0; i < VNET_PORT_HASH_SIZE; i++) |
| 1637 | INIT_HLIST_HEAD(&vp->port_hash[i]); |
| 1638 | INIT_LIST_HEAD(&vp->list); |
| 1639 | vp->local_mac = *local_mac; |
| 1640 | |
David S. Miller | 8fd17f2 | 2009-03-20 00:51:22 -0700 | [diff] [blame] | 1641 | dev->netdev_ops = &vnet_ops; |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1642 | dev->ethtool_ops = &vnet_ethtool_ops; |
| 1643 | dev->watchdog_timeo = VNET_TX_TIMEOUT; |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1644 | |
David L Stevens | 1b6b0a4 | 2014-12-02 15:31:22 -0500 | [diff] [blame^] | 1645 | dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG; |
David L Stevens | da38c56 | 2014-12-02 15:31:13 -0500 | [diff] [blame] | 1646 | dev->features = dev->hw_features; |
| 1647 | |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1648 | err = register_netdev(dev); |
| 1649 | if (err) { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1650 | pr_err("Cannot register net device, aborting\n"); |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1651 | goto err_out_free_dev; |
| 1652 | } |
| 1653 | |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1654 | netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr); |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1655 | |
| 1656 | list_add(&vp->list, &vnet_list); |
| 1657 | |
| 1658 | return vp; |
| 1659 | |
| 1660 | err_out_free_dev: |
| 1661 | free_netdev(dev); |
| 1662 | |
| 1663 | return ERR_PTR(err); |
| 1664 | } |
| 1665 | |
Bill Pemberton | f73d12b | 2012-12-03 09:24:02 -0500 | [diff] [blame] | 1666 | static struct vnet *vnet_find_or_create(const u64 *local_mac) |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1667 | { |
| 1668 | struct vnet *iter, *vp; |
| 1669 | |
| 1670 | mutex_lock(&vnet_list_mutex); |
| 1671 | vp = NULL; |
| 1672 | list_for_each_entry(iter, &vnet_list, list) { |
| 1673 | if (iter->local_mac == *local_mac) { |
| 1674 | vp = iter; |
| 1675 | break; |
| 1676 | } |
| 1677 | } |
| 1678 | if (!vp) |
| 1679 | vp = vnet_new(local_mac); |
| 1680 | mutex_unlock(&vnet_list_mutex); |
| 1681 | |
| 1682 | return vp; |
| 1683 | } |
| 1684 | |
Sowmini Varadhan | a4b70a0 | 2014-07-16 10:02:26 -0400 | [diff] [blame] | 1685 | static void vnet_cleanup(void) |
| 1686 | { |
| 1687 | struct vnet *vp; |
| 1688 | struct net_device *dev; |
| 1689 | |
| 1690 | mutex_lock(&vnet_list_mutex); |
| 1691 | while (!list_empty(&vnet_list)) { |
| 1692 | vp = list_first_entry(&vnet_list, struct vnet, list); |
| 1693 | list_del(&vp->list); |
| 1694 | dev = vp->dev; |
| 1695 | /* vio_unregister_driver() should have cleaned up port_list */ |
| 1696 | BUG_ON(!list_empty(&vp->port_list)); |
| 1697 | unregister_netdev(dev); |
| 1698 | free_netdev(dev); |
| 1699 | } |
| 1700 | mutex_unlock(&vnet_list_mutex); |
| 1701 | } |
| 1702 | |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1703 | static const char *local_mac_prop = "local-mac-address"; |
| 1704 | |
Bill Pemberton | f73d12b | 2012-12-03 09:24:02 -0500 | [diff] [blame] | 1705 | static struct vnet *vnet_find_parent(struct mdesc_handle *hp, |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1706 | u64 port_node) |
| 1707 | { |
| 1708 | const u64 *local_mac = NULL; |
| 1709 | u64 a; |
| 1710 | |
| 1711 | mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) { |
| 1712 | u64 target = mdesc_arc_target(hp, a); |
| 1713 | const char *name; |
| 1714 | |
| 1715 | name = mdesc_get_property(hp, target, "name", NULL); |
| 1716 | if (!name || strcmp(name, "network")) |
| 1717 | continue; |
| 1718 | |
| 1719 | local_mac = mdesc_get_property(hp, target, |
| 1720 | local_mac_prop, NULL); |
| 1721 | if (local_mac) |
| 1722 | break; |
| 1723 | } |
| 1724 | if (!local_mac) |
| 1725 | return ERR_PTR(-ENODEV); |
| 1726 | |
| 1727 | return vnet_find_or_create(local_mac); |
| 1728 | } |
| 1729 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1730 | static struct ldc_channel_config vnet_ldc_cfg = { |
| 1731 | .event = vnet_event, |
| 1732 | .mtu = 64, |
| 1733 | .mode = LDC_MODE_UNRELIABLE, |
| 1734 | }; |
| 1735 | |
| 1736 | static struct vio_driver_ops vnet_vio_ops = { |
| 1737 | .send_attr = vnet_send_attr, |
| 1738 | .handle_attr = vnet_handle_attr, |
| 1739 | .handshake_complete = vnet_handshake_complete, |
| 1740 | }; |
| 1741 | |
Bill Pemberton | f73d12b | 2012-12-03 09:24:02 -0500 | [diff] [blame] | 1742 | static void print_version(void) |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1743 | { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1744 | printk_once(KERN_INFO "%s", version); |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1745 | } |
| 1746 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1747 | const char *remote_macaddr_prop = "remote-mac-address"; |
| 1748 | |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1749 | static void |
| 1750 | vnet_port_add_txq(struct vnet_port *port) |
| 1751 | { |
| 1752 | struct vnet *vp = port->vp; |
| 1753 | int n; |
| 1754 | |
| 1755 | n = vp->nports++; |
| 1756 | n = n & (VNET_MAX_TXQS - 1); |
| 1757 | port->q_index = n; |
| 1758 | netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index)); |
| 1759 | } |
| 1760 | |
| 1761 | static void |
| 1762 | vnet_port_rm_txq(struct vnet_port *port) |
| 1763 | { |
| 1764 | port->vp->nports--; |
| 1765 | netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index)); |
| 1766 | } |
| 1767 | |
Greg Kroah-Hartman | 1dd06ae | 2012-12-06 14:30:56 +0000 | [diff] [blame] | 1768 | static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1769 | { |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1770 | struct mdesc_handle *hp; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1771 | struct vnet_port *port; |
| 1772 | unsigned long flags; |
| 1773 | struct vnet *vp; |
| 1774 | const u64 *rmac; |
| 1775 | int len, i, err, switch_port; |
| 1776 | |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1777 | print_version(); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1778 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1779 | hp = mdesc_grab(); |
| 1780 | |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1781 | vp = vnet_find_parent(hp, vdev->mp); |
| 1782 | if (IS_ERR(vp)) { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1783 | pr_err("Cannot find port parent vnet\n"); |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1784 | err = PTR_ERR(vp); |
| 1785 | goto err_out_put_mdesc; |
| 1786 | } |
| 1787 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1788 | rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len); |
| 1789 | err = -ENODEV; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1790 | if (!rmac) { |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1791 | pr_err("Port lacks %s property\n", remote_macaddr_prop); |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1792 | goto err_out_put_mdesc; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1793 | } |
| 1794 | |
| 1795 | port = kzalloc(sizeof(*port), GFP_KERNEL); |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1796 | err = -ENOMEM; |
Joe Perches | e404dec | 2012-01-29 12:56:23 +0000 | [diff] [blame] | 1797 | if (!port) |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1798 | goto err_out_put_mdesc; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1799 | |
| 1800 | for (i = 0; i < ETH_ALEN; i++) |
| 1801 | port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff; |
| 1802 | |
| 1803 | port->vp = vp; |
| 1804 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1805 | err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK, |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1806 | vnet_versions, ARRAY_SIZE(vnet_versions), |
| 1807 | &vnet_vio_ops, vp->dev->name); |
| 1808 | if (err) |
| 1809 | goto err_out_free_port; |
| 1810 | |
| 1811 | err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port); |
| 1812 | if (err) |
| 1813 | goto err_out_free_port; |
| 1814 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1815 | netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT); |
| 1816 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1817 | INIT_HLIST_NODE(&port->hash); |
| 1818 | INIT_LIST_HEAD(&port->list); |
| 1819 | |
| 1820 | switch_port = 0; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1821 | if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL) |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1822 | switch_port = 1; |
David S. Miller | 028ebff | 2007-07-20 02:30:25 -0700 | [diff] [blame] | 1823 | port->switch_port = switch_port; |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1824 | |
| 1825 | spin_lock_irqsave(&vp->lock, flags); |
| 1826 | if (switch_port) |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1827 | list_add_rcu(&port->list, &vp->port_list); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1828 | else |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1829 | list_add_tail_rcu(&port->list, &vp->port_list); |
| 1830 | hlist_add_head_rcu(&port->hash, |
| 1831 | &vp->port_hash[vnet_hashfn(port->raddr)]); |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1832 | vnet_port_add_txq(port); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1833 | spin_unlock_irqrestore(&vp->lock, flags); |
| 1834 | |
| 1835 | dev_set_drvdata(&vdev->dev, port); |
| 1836 | |
Joe Perches | 4d5870e | 2010-08-17 07:55:05 +0000 | [diff] [blame] | 1837 | pr_info("%s: PORT ( remote-mac %pM%s )\n", |
| 1838 | vp->dev->name, port->raddr, switch_port ? " switch-port" : ""); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1839 | |
David L Stevens | 8e845f4 | 2014-09-29 19:48:11 -0400 | [diff] [blame] | 1840 | setup_timer(&port->clean_timer, vnet_clean_timer_expire, |
| 1841 | (unsigned long)port); |
| 1842 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1843 | napi_enable(&port->napi); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1844 | vio_port_up(&port->vio); |
| 1845 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1846 | mdesc_release(hp); |
| 1847 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1848 | return 0; |
| 1849 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1850 | err_out_free_port: |
| 1851 | kfree(port); |
| 1852 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 1853 | err_out_put_mdesc: |
| 1854 | mdesc_release(hp); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1855 | return err; |
| 1856 | } |
| 1857 | |
| 1858 | static int vnet_port_remove(struct vio_dev *vdev) |
| 1859 | { |
| 1860 | struct vnet_port *port = dev_get_drvdata(&vdev->dev); |
| 1861 | |
| 1862 | if (port) { |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1863 | |
| 1864 | del_timer_sync(&port->vio.timer); |
| 1865 | |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1866 | napi_disable(&port->napi); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1867 | |
Sowmini Varadhan | 2a968dd | 2014-10-25 15:12:20 -0400 | [diff] [blame] | 1868 | list_del_rcu(&port->list); |
| 1869 | hlist_del_rcu(&port->hash); |
| 1870 | |
| 1871 | synchronize_rcu(); |
| 1872 | del_timer_sync(&port->clean_timer); |
Sowmini Varadhan | d51bffd | 2014-10-30 12:46:09 -0400 | [diff] [blame] | 1873 | vnet_port_rm_txq(port); |
Sowmini Varadhan | 6908882 | 2014-10-25 15:12:12 -0400 | [diff] [blame] | 1874 | netif_napi_del(&port->napi); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1875 | vnet_port_free_tx_bufs(port); |
| 1876 | vio_ldc_free(&port->vio); |
| 1877 | |
| 1878 | dev_set_drvdata(&vdev->dev, NULL); |
| 1879 | |
| 1880 | kfree(port); |
Dave Kleikamp | aabb987 | 2013-07-01 16:49:22 -0500 | [diff] [blame] | 1881 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1882 | } |
| 1883 | return 0; |
| 1884 | } |
| 1885 | |
David S. Miller | 3d452e5 | 2008-09-01 01:48:52 -0700 | [diff] [blame] | 1886 | static const struct vio_device_id vnet_port_match[] = { |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1887 | { |
| 1888 | .type = "vnet-port", |
| 1889 | }, |
| 1890 | {}, |
| 1891 | }; |
Fabio Massimo Di Nitto | da68e08 | 2007-07-18 14:35:23 -0700 | [diff] [blame] | 1892 | MODULE_DEVICE_TABLE(vio, vnet_port_match); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1893 | |
| 1894 | static struct vio_driver vnet_port_driver = { |
| 1895 | .id_table = vnet_port_match, |
| 1896 | .probe = vnet_port_probe, |
| 1897 | .remove = vnet_port_remove, |
Benjamin Herrenschmidt | cb52d89 | 2012-03-26 19:06:30 +0000 | [diff] [blame] | 1898 | .name = "vnet_port", |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1899 | }; |
| 1900 | |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1901 | static int __init vnet_init(void) |
| 1902 | { |
David S. Miller | 9184a04 | 2007-07-17 22:19:10 -0700 | [diff] [blame] | 1903 | return vio_register_driver(&vnet_port_driver); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1904 | } |
| 1905 | |
| 1906 | static void __exit vnet_exit(void) |
| 1907 | { |
| 1908 | vio_unregister_driver(&vnet_port_driver); |
Sowmini Varadhan | a4b70a0 | 2014-07-16 10:02:26 -0400 | [diff] [blame] | 1909 | vnet_cleanup(); |
David S. Miller | 4c521e4 | 2007-07-09 22:23:51 -0700 | [diff] [blame] | 1910 | } |
| 1911 | |
| 1912 | module_init(vnet_init); |
| 1913 | module_exit(vnet_exit); |