target/linux/generic/patches-4.1/760-8139cp-fixes-from-4.3.patch

   1 commit 41b976414c88016e2c9d9b2f6667ee67a998d388
   2 Author: David Woodhouse <David.Woodhouse@intel.com>
   3 Date:   Wed Sep 23 09:45:31 2015 +0100
   4
   5     8139cp: Dump contents of descriptor ring on TX timeout
   6
   7     We are seeing unexplained TX timeouts under heavy load. Let's try to get
   8     a better idea of what's going on.
   9
  10     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  11     Signed-off-by: David S. Miller <davem@davemloft.net>
  12
  13 commit 7f4c685633e2df9ba10d49a31dda13715745db37
  14 Author: David Woodhouse <David.Woodhouse@intel.com>
  15 Date:   Wed Sep 23 09:45:16 2015 +0100
  16
  17     8139cp: Fix DMA unmapping of transmitted buffers
  18
  19     The low 16 bits of the 'opts1' field in the TX descriptor are supposed
  20     to still contain the buffer length when the descriptor is handed back to
  21     us. In practice, at least on my hardware, they don't. So stash the
  22     original value of the opts1 field and get the length to unmap from
  23     there.
  24
  25     There are other ways we could have worked out the length, but I actually
  26     want a stash of the opts1 field anyway so that I can dump it alongside
  27     the contents of the descriptor ring when we suffer a TX timeout.
  28
  29     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  30     Signed-off-by: David S. Miller <davem@davemloft.net>
  31
  32 commit 0a5aeee0b79fa99d8e04c98dd4e87d4f52aa497b
  33 Author: David Woodhouse <David.Woodhouse@intel.com>
  34 Date:   Wed Sep 23 09:44:57 2015 +0100
  35
  36     8139cp: Reduce duplicate csum/tso code in cp_start_xmit()
  37
  38     We calculate the value of the opts1 descriptor field in three different
  39     places. With two different behaviours when given an invalid packet to
  40     be checksummed — none of them correct. Sort that out.
  41
  42     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  43     Signed-off-by: David S. Miller <davem@davemloft.net>
  44
  45 commit a3b804043f490aeec57d8ca5baccdd35e6250857
  46 Author: David Woodhouse <David.Woodhouse@intel.com>
  47 Date:   Wed Sep 23 09:44:38 2015 +0100
  48
  49     8139cp: Fix TSO/scatter-gather descriptor setup
  50
  51     When sending a TSO frame in multiple buffers, we were neglecting to set
  52     the first descriptor up in TSO mode.
  53
  54     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  55     Signed-off-by: David S. Miller <davem@davemloft.net>
  56
  57 commit 26b0bad6ac3a0167792dc4ffb276c29bc597d239
  58 Author: David Woodhouse <David.Woodhouse@intel.com>
  59 Date:   Wed Sep 23 09:44:06 2015 +0100
  60
  61     8139cp: Fix tx_queued debug message to print correct slot numbers
  62
  63     After a certain amount of staring at the debug output of this driver, I
  64     realised it was lying to me.
  65
  66     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  67     Signed-off-by: David S. Miller <davem@davemloft.net>
  68
  69 commit aaa0062ecf4877a26dea66bee1039c6eaf906c94
  70 Author: David Woodhouse <David.Woodhouse@intel.com>
  71 Date:   Wed Sep 23 09:43:41 2015 +0100
  72
  73     8139cp: Do not re-enable RX interrupts in cp_tx_timeout()
  74
  75     If an RX interrupt was already received but NAPI has not yet run when
  76     the RX timeout happens, we end up in cp_tx_timeout() with RX interrupts
  77     already disabled. Blindly re-enabling them will cause an IRQ storm.
  78
  79     (This is made particularly horrid by the fact that cp_interrupt() always
  80     returns that it's handled the interrupt, even when it hasn't actually
  81     done anything. If it didn't do that, the core IRQ code would have
  82     detected the storm and handled it, I'd have had a clear smoking gun
  83     backtrace instead of just a spontaneously resetting router, and I'd have
  84     at *least* two days of my life back. Changing the return value of
  85     cp_interrupt() will be argued about under separate cover.)
  86
  87     Unconditionally leave RX interrupts disabled after the reset, and
  88     schedule NAPI to check the receive ring and re-enable them.
  89
  90     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
  91     Signed-off-by: David S. Miller <davem@davemloft.net>
  92
  93 commit 7a8a8e75d505147358b225173e890ada43a267e2
  94 Author: David Woodhouse <dwmw2@infradead.org>
  95 Date:   Fri Sep 18 00:21:54 2015 +0100
  96
  97     8139cp: Call __cp_set_rx_mode() from cp_tx_timeout()
  98
  99     Unless we reset the RX config, on real hardware I don't seem to receive
 100     any packets after a TX timeout.
 101
 102     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
 103     Signed-off-by: David S. Miller <davem@davemloft.net>
 104
 105 commit fc27bd115b334e3ebdc682a42a47c3aea2566dcc
 106 Author: David Woodhouse <dwmw2@infradead.org>
 107 Date:   Fri Sep 18 00:19:08 2015 +0100
 108
 109     8139cp: Use dev_kfree_skb_any() instead of dev_kfree_skb() in cp_clean_rings()
 110
 111     This can be called from cp_tx_timeout() with interrupts disabled.
 112     Spotted by Francois Romieu <romieu@fr.zoreil.com>
 113
 114     Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
 115     Signed-off-by: David S. Miller <davem@davemloft.net>
 116 --- a/drivers/net/ethernet/realtek/8139cp.c
 117 +++ b/drivers/net/ethernet/realtek/8139cp.c
 118 @@ -157,6 +157,7 @@ enum {
 119         NWayAdvert      = 0x66, /* MII ADVERTISE */
 120         NWayLPAR        = 0x68, /* MII LPA */
 121         NWayExpansion   = 0x6A, /* MII Expansion */
 122 +       TxDmaOkLowDesc  = 0x82, /* Low 16 bit address of a Tx descriptor. */
 123         Config5         = 0xD8, /* Config5 */
 124         TxPoll          = 0xD9, /* Tell chip to check Tx descriptors for work */
 125         RxMaxSize       = 0xDA, /* Max size of an Rx packet (8169 only) */
 126 @@ -341,6 +342,7 @@ struct cp_private {
 127         unsigned                tx_tail;
 128         struct cp_desc          *tx_ring;
 129         struct sk_buff          *tx_skb[CP_TX_RING_SIZE];
 130 +       u32                     tx_opts[CP_TX_RING_SIZE];
 131
 132         unsigned                rx_buf_sz;
 133         unsigned                wol_enabled : 1; /* Is Wake-on-LAN enabled? */
 134 @@ -665,7 +667,7 @@ static void cp_tx (struct cp_private *cp
 135                 BUG_ON(!skb);
 136
 137                 dma_unmap_single(&cp->pdev->dev, le64_to_cpu(txd->addr),
 138 -                                le32_to_cpu(txd->opts1) & 0xffff,
 139 +                                cp->tx_opts[tx_tail] & 0xffff,
 140                                  PCI_DMA_TODEVICE);
 141
 142                 if (status & LastFrag) {
 143 @@ -733,7 +735,7 @@ static netdev_tx_t cp_start_xmit (struct
 144  {
 145         struct cp_private *cp = netdev_priv(dev);
 146         unsigned entry;
 147 -       u32 eor, flags;
 148 +       u32 eor, opts1;
 149         unsigned long intr_flags;
 150         __le32 opts2;
 151         int mss = 0;
 152 @@ -753,6 +755,21 @@ static netdev_tx_t cp_start_xmit (struct
 153         mss = skb_shinfo(skb)->gso_size;
 154
 155         opts2 = cpu_to_le32(cp_tx_vlan_tag(skb));
 156 +       opts1 = DescOwn;
 157 +       if (mss)
 158 +               opts1 |= LargeSend | ((mss & MSSMask) << MSSShift);
 159 +       else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 160 +               const struct iphdr *ip = ip_hdr(skb);
 161 +               if (ip->protocol == IPPROTO_TCP)
 162 +                       opts1 |= IPCS | TCPCS;
 163 +               else if (ip->protocol == IPPROTO_UDP)
 164 +                       opts1 |= IPCS | UDPCS;
 165 +               else {
 166 +                       WARN_ONCE(1,
 167 +                                 "Net bug: asked to checksum invalid Legacy IP packet\n");
 168 +                       goto out_dma_error;
 169 +               }
 170 +       }
 171
 172         if (skb_shinfo(skb)->nr_frags == 0) {
 173                 struct cp_desc *txd = &cp->tx_ring[entry];
 174 @@ -768,31 +785,20 @@ static netdev_tx_t cp_start_xmit (struct
 175                 txd->addr = cpu_to_le64(mapping);
 176                 wmb();
 177
 178 -               flags = eor | len | DescOwn | FirstFrag | LastFrag;
 179 -
 180 -               if (mss)
 181 -                       flags |= LargeSend | ((mss & MSSMask) << MSSShift);
 182 -               else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 183 -                       const struct iphdr *ip = ip_hdr(skb);
 184 -                       if (ip->protocol == IPPROTO_TCP)
 185 -                               flags |= IPCS | TCPCS;
 186 -                       else if (ip->protocol == IPPROTO_UDP)
 187 -                               flags |= IPCS | UDPCS;
 188 -                       else
 189 -                               WARN_ON(1);     /* we need a WARN() */
 190 -               }
 191 +               opts1 |= eor | len | FirstFrag | LastFrag;
 192
 193 -               txd->opts1 = cpu_to_le32(flags);
 194 +               txd->opts1 = cpu_to_le32(opts1);
 195                 wmb();
 196
 197                 cp->tx_skb[entry] = skb;
 198 -               entry = NEXT_TX(entry);
 199 +               cp->tx_opts[entry] = opts1;
 200 +               netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
 201 +                         entry, skb->len);
 202         } else {
 203                 struct cp_desc *txd;
 204 -               u32 first_len, first_eor;
 205 +               u32 first_len, first_eor, ctrl;
 206                 dma_addr_t first_mapping;
 207                 int frag, first_entry = entry;
 208 -               const struct iphdr *ip = ip_hdr(skb);
 209
 210                 /* We must give this initial chunk to the device last.
 211                  * Otherwise we could race with the device.
 212 @@ -805,14 +811,14 @@ static netdev_tx_t cp_start_xmit (struct
 213                         goto out_dma_error;
 214
 215                 cp->tx_skb[entry] = skb;
 216 -               entry = NEXT_TX(entry);
 217
 218                 for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
 219                         const skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
 220                         u32 len;
 221 -                       u32 ctrl;
 222                         dma_addr_t mapping;
 223
 224 +                       entry = NEXT_TX(entry);
 225 +
 226                         len = skb_frag_size(this_frag);
 227                         mapping = dma_map_single(&cp->pdev->dev,
 228                                                  skb_frag_address(this_frag),
 229 @@ -824,19 +830,7 @@ static netdev_tx_t cp_start_xmit (struct
 230
 231                         eor = (entry == (CP_TX_RING_SIZE - 1)) ? RingEnd : 0;
 232
 233 -                       ctrl = eor | len | DescOwn;
 234 -
 235 -                       if (mss)
 236 -                               ctrl |= LargeSend |
 237 -                                       ((mss & MSSMask) << MSSShift);
 238 -                       else if (skb->ip_summed == CHECKSUM_PARTIAL) {
 239 -                               if (ip->protocol == IPPROTO_TCP)
 240 -                                       ctrl |= IPCS | TCPCS;
 241 -                               else if (ip->protocol == IPPROTO_UDP)
 242 -                                       ctrl |= IPCS | UDPCS;
 243 -                               else
 244 -                                       BUG();
 245 -                       }
 246 +                       ctrl = opts1 | eor | len;
 247
 248                         if (frag == skb_shinfo(skb)->nr_frags - 1)
 249                                 ctrl |= LastFrag;
 250 @@ -849,8 +843,8 @@ static netdev_tx_t cp_start_xmit (struct
 251                         txd->opts1 = cpu_to_le32(ctrl);
 252                         wmb();
 253
 254 +                       cp->tx_opts[entry] = ctrl;
 255                         cp->tx_skb[entry] = skb;
 256 -                       entry = NEXT_TX(entry);
 257                 }
 258
 259                 txd = &cp->tx_ring[first_entry];
 260 @@ -858,27 +852,17 @@ static netdev_tx_t cp_start_xmit (struct
 261                 txd->addr = cpu_to_le64(first_mapping);
 262                 wmb();
 263
 264 -               if (skb->ip_summed == CHECKSUM_PARTIAL) {
 265 -                       if (ip->protocol == IPPROTO_TCP)
 266 -                               txd->opts1 = cpu_to_le32(first_eor | first_len |
 267 -                                                        FirstFrag | DescOwn |
 268 -                                                        IPCS | TCPCS);
 269 -                       else if (ip->protocol == IPPROTO_UDP)
 270 -                               txd->opts1 = cpu_to_le32(first_eor | first_len |
 271 -                                                        FirstFrag | DescOwn |
 272 -                                                        IPCS | UDPCS);
 273 -                       else
 274 -                               BUG();
 275 -               } else
 276 -                       txd->opts1 = cpu_to_le32(first_eor | first_len |
 277 -                                                FirstFrag | DescOwn);
 278 +               ctrl = opts1 | first_eor | first_len | FirstFrag;
 279 +               txd->opts1 = cpu_to_le32(ctrl);
 280                 wmb();
 281 +
 282 +               cp->tx_opts[first_entry] = ctrl;
 283 +               netif_dbg(cp, tx_queued, cp->dev, "tx queued, slots %d-%d, skblen %d\n",
 284 +                         first_entry, entry, skb->len);
 285         }
 286 -       cp->tx_head = entry;
 287 +       cp->tx_head = NEXT_TX(entry);
 288
 289         netdev_sent_queue(dev, skb->len);
 290 -       netif_dbg(cp, tx_queued, cp->dev, "tx queued, slot %d, skblen %d\n",
 291 -                 entry, skb->len);
 292         if (TX_BUFFS_AVAIL(cp) <= (MAX_SKB_FRAGS + 1))
 293                 netif_stop_queue(dev);
 294
 295 @@ -1115,6 +1099,7 @@ static int cp_init_rings (struct cp_priv
 296  {
 297         memset(cp->tx_ring, 0, sizeof(struct cp_desc) * CP_TX_RING_SIZE);
 298         cp->tx_ring[CP_TX_RING_SIZE - 1].opts1 = cpu_to_le32(RingEnd);
 299 +       memset(cp->tx_opts, 0, sizeof(cp->tx_opts));
 300
 301         cp_init_rings_index(cp);
 302
 303 @@ -1151,7 +1136,7 @@ static void cp_clean_rings (struct cp_pr
 304                         desc = cp->rx_ring + i;
 305                         dma_unmap_single(&cp->pdev->dev,le64_to_cpu(desc->addr),
 306                                          cp->rx_buf_sz, PCI_DMA_FROMDEVICE);
 307 -                       dev_kfree_skb(cp->rx_skb[i]);
 308 +                       dev_kfree_skb_any(cp->rx_skb[i]);
 309                 }
 310         }
 311
 312 @@ -1164,7 +1149,7 @@ static void cp_clean_rings (struct cp_pr
 313                                          le32_to_cpu(desc->opts1) & 0xffff,
 314                                          PCI_DMA_TODEVICE);
 315                         if (le32_to_cpu(desc->opts1) & LastFrag)
 316 -                               dev_kfree_skb(skb);
 317 +                               dev_kfree_skb_any(skb);
 318                         cp->dev->stats.tx_dropped++;
 319                 }
 320         }
 321 @@ -1172,6 +1157,7 @@ static void cp_clean_rings (struct cp_pr
 322
 323         memset(cp->rx_ring, 0, sizeof(struct cp_desc) * CP_RX_RING_SIZE);
 324         memset(cp->tx_ring, 0, sizeof(struct cp_desc) * CP_TX_RING_SIZE);
 325 +       memset(cp->tx_opts, 0, sizeof(cp->tx_opts));
 326
 327         memset(cp->rx_skb, 0, sizeof(struct sk_buff *) * CP_RX_RING_SIZE);
 328         memset(cp->tx_skb, 0, sizeof(struct sk_buff *) * CP_TX_RING_SIZE);
 329 @@ -1249,7 +1235,7 @@ static void cp_tx_timeout(struct net_dev
 330  {
 331         struct cp_private *cp = netdev_priv(dev);
 332         unsigned long flags;
 333 -       int rc;
 334 +       int rc, i;
 335
 336         netdev_warn(dev, "Transmit timeout, status %2x %4x %4x %4x\n",
 337                     cpr8(Cmd), cpr16(CpCmd),
 338 @@ -1257,13 +1243,26 @@ static void cp_tx_timeout(struct net_dev
 339
 340         spin_lock_irqsave(&cp->lock, flags);
 341
 342 +       netif_dbg(cp, tx_err, cp->dev, "TX ring head %d tail %d desc %x\n",
 343 +                 cp->tx_head, cp->tx_tail, cpr16(TxDmaOkLowDesc));
 344 +       for (i = 0; i < CP_TX_RING_SIZE; i++) {
 345 +               netif_dbg(cp, tx_err, cp->dev,
 346 +                         "TX slot %d @%p: %08x (%08x) %08x %llx %p\n",
 347 +                         i, &cp->tx_ring[i], le32_to_cpu(cp->tx_ring[i].opts1),
 348 +                         cp->tx_opts[i], le32_to_cpu(cp->tx_ring[i].opts2),
 349 +                         le64_to_cpu(cp->tx_ring[i].addr),
 350 +                         cp->tx_skb[i]);
 351 +       }
 352 +
 353         cp_stop_hw(cp);
 354         cp_clean_rings(cp);
 355         rc = cp_init_rings(cp);
 356         cp_start_hw(cp);
 357 -       cp_enable_irq(cp);
 358 +       __cp_set_rx_mode(dev);
 359 +       cpw16_f(IntrMask, cp_norx_intr_mask);
 360
 361         netif_wake_queue(dev);
 362 +       napi_schedule_irqoff(&cp->napi);
 363
 364         spin_unlock_irqrestore(&cp->lock, flags);
 365  }