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