target/linux/cns3xxx/patches-3.3/410-ethernet_fix_jumbo_frame.patch

   1 --- a/drivers/net/ethernet/cavium/cns3xxx_eth.c
   2 +++ b/drivers/net/ethernet/cavium/cns3xxx_eth.c
   3 @@ -26,15 +26,21 @@
   4
   5  #define DRV_NAME "cns3xxx_eth"
   6
   7 -#define RX_DESCS 512
   8 -#define TX_DESCS 512
   9 -#define SKB_DMA_REALIGN ((PAGE_SIZE - NET_SKB_PAD) % SMP_CACHE_BYTES)
  10 +#define RX_DESCS 128
  11 +#define TX_DESCS 128
  12
  13  #define RX_POOL_ALLOC_SIZE (sizeof(struct rx_desc) * RX_DESCS)
  14  #define TX_POOL_ALLOC_SIZE (sizeof(struct tx_desc) * TX_DESCS)
  15  #define REGS_SIZE 336
  16 -#define MAX_MRU (1536 + SKB_DMA_REALIGN)
  17 -#define CNS3XXX_MAX_MTU (1536)
  18 +
  19 +#define RX_BUFFER_ALIGN 64
  20 +#define RX_BUFFER_ALIGN_MASK (~(RX_BUFFER_ALIGN - 1))
  21 +
  22 +#define SKB_HEAD_ALIGN (((PAGE_SIZE - NET_SKB_PAD) % RX_BUFFER_ALIGN) + NET_SKB_PAD + NET_IP_ALIGN)
  23 +#define RX_SEGMENT_ALLOC_SIZE 4096
  24 +#define RX_SEGMENT_BUFSIZE (SKB_WITH_OVERHEAD(RX_SEGMENT_ALLOC_SIZE))
  25 +#define RX_SEGMENT_MRU (((RX_SEGMENT_BUFSIZE - SKB_HEAD_ALIGN) & RX_BUFFER_ALIGN_MASK) - NET_IP_ALIGN)
  26 +#define MAX_MTU        9500
  27
  28  #define NAPI_WEIGHT 64
  29
  30 @@ -266,7 +272,7 @@ struct _rx_ring {
  31         struct rx_desc *desc;
  32         dma_addr_t phys_addr;
  33         struct rx_desc *cur_addr;
  34 -       struct sk_buff *buff_tab[RX_DESCS];
  35 +       void *buff_tab[RX_DESCS];
  36         unsigned int phys_tab[RX_DESCS];
  37         u32 cur_index;
  38         u32 alloc_index;
  39 @@ -280,6 +286,8 @@ struct sw {
  40         struct cns3xxx_plat_info *plat;
  41         struct _tx_ring *tx_ring;
  42         struct _rx_ring *rx_ring;
  43 +       struct sk_buff *frag_first;
  44 +       struct sk_buff *frag_last;
  45  };
  46
  47  struct port {
  48 @@ -500,37 +508,35 @@ static void cns3xxx_alloc_rx_buf(struct
  49         struct _rx_ring *rx_ring = sw->rx_ring;
  50         unsigned int i = rx_ring->alloc_index;
  51         struct rx_desc *desc = &(rx_ring)->desc[i];
  52 -       struct sk_buff *skb;
  53 +       void *buf;
  54         unsigned int phys;
  55
  56         for (received += rx_ring->alloc_count; received > 0; received--) {
  57 -               if ((skb = dev_alloc_skb(MAX_MRU))) {
  58 -                       if (SKB_DMA_REALIGN)
  59 -                               skb_reserve(skb, SKB_DMA_REALIGN);
  60 -                       skb_reserve(skb, NET_IP_ALIGN);
  61 -                       phys = dma_map_single(NULL, skb->data,
  62 -                                   CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
  63 -                       if (dma_mapping_error(NULL, phys)) {
  64 -                               dev_kfree_skb(skb);
  65 -                               /* Failed to map, better luck next time */
  66 -                               goto out;;
  67 -                       }
  68 -                       desc->sdp = phys;
  69 -               } else {
  70 -                       /* Failed to allocate skb, try again next time */
  71 +               buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_ATOMIC);
  72 +               if (!buf)
  73 +                       goto out;
  74 +
  75 +               phys = dma_map_single(NULL, buf + SKB_HEAD_ALIGN,
  76 +                                     RX_SEGMENT_MRU, DMA_FROM_DEVICE);
  77 +               if (dma_mapping_error(NULL, phys)) {
  78 +                       kfree(buf);
  79                         goto out;
  80                 }
  81
  82 +               desc->sdl = RX_SEGMENT_MRU;
  83 +               desc->sdp = phys;
  84 +
  85                 /* put the new buffer on RX-free queue */
  86 -               rx_ring->buff_tab[i] = skb;
  87 +               rx_ring->buff_tab[i] = buf;
  88                 rx_ring->phys_tab[i] = phys;
  89                 if (i == RX_DESCS - 1) {
  90                         i = 0;
  91                         desc->config0 = END_OF_RING | FIRST_SEGMENT |
  92 -                                       LAST_SEGMENT | CNS3XXX_MAX_MTU;
  93 +                                       LAST_SEGMENT | RX_SEGMENT_MRU;
  94                         desc = &(rx_ring)->desc[i];
  95                 } else {
  96 -                       desc->config0 = FIRST_SEGMENT | LAST_SEGMENT | CNS3XXX_MAX_MTU;
  97 +                       desc->config0 = FIRST_SEGMENT | LAST_SEGMENT |
  98 +                                       RX_SEGMENT_MRU;
  99                         i++;
 100                         desc++;
 101                 }
 102 @@ -579,7 +585,6 @@ static void clear_tx_desc(struct sw *sw)
 103  static int eth_poll(struct napi_struct *napi, int budget)
 104  {
 105         struct sw *sw = container_of(napi, struct sw, napi);
 106 -       struct net_device *dev;
 107         struct _rx_ring *rx_ring = sw->rx_ring;
 108         int received = 0;
 109         unsigned int length;
 110 @@ -588,49 +593,82 @@ static int eth_poll(struct napi_struct *
 111
 112         while (desc->cown) {
 113                 struct sk_buff *skb;
 114 +               int reserve = SKB_HEAD_ALIGN;
 115
 116                 if (received >= budget)
 117                         break;
 118
 119 -               skb = rx_ring->buff_tab[i];
 120 +               /* process received frame */
 121 +               dma_unmap_single(NULL, rx_ring->phys_tab[i],
 122 +                                RX_SEGMENT_MRU, DMA_FROM_DEVICE);
 123
 124 -               dev = switch_port_tab[desc->sp]->netdev;
 125 +               skb = build_skb(rx_ring->buff_tab[i]);
 126 +               if (!skb)
 127 +                       break;
 128 +
 129 +               skb->dev = switch_port_tab[desc->sp]->netdev;
 130
 131                 length = desc->sdl;
 132 -               /* process received frame */
 133 -               dma_unmap_single(&dev->dev, rx_ring->phys_tab[i],
 134 -                                length, DMA_FROM_DEVICE);
 135 +               if (desc->fsd && !desc->lsd)
 136 +                       length = RX_SEGMENT_MRU;
 137 +
 138 +               if (!desc->fsd) {
 139 +                       reserve -= NET_IP_ALIGN;
 140 +                       if (!desc->lsd)
 141 +                               length += NET_IP_ALIGN;
 142 +               }
 143
 144 +               skb_reserve(skb, reserve);
 145                 skb_put(skb, length);
 146
 147 -               skb->dev = dev;
 148 -               skb->protocol = eth_type_trans(skb, dev);
 149 +               if (!sw->frag_first)
 150 +                       sw->frag_first = skb;
 151 +               else {
 152 +                       if (sw->frag_first == sw->frag_last)
 153 +                               skb_frag_add_head(sw->frag_first, skb);
 154 +                       else
 155 +                               sw->frag_last->next = skb;
 156 +                       sw->frag_first->len += skb->len;
 157 +                       sw->frag_first->data_len += skb->len;
 158 +                       sw->frag_first->truesize += skb->truesize;
 159 +               }
 160 +               sw->frag_last = skb;
 161 +
 162 +               if (desc->lsd) {
 163 +                       struct net_device *dev;
 164
 165 -               dev->stats.rx_packets++;
 166 -               dev->stats.rx_bytes += length;
 167 +                       skb = sw->frag_first;
 168 +                       dev = skb->dev;
 169 +                       skb->protocol = eth_type_trans(skb, dev);
 170 +
 171 +                       dev->stats.rx_packets++;
 172 +                       dev->stats.rx_bytes += skb->len;
 173 +
 174 +                       /* RX Hardware checksum offload */
 175 +                       skb->ip_summed = CHECKSUM_NONE;
 176 +                       switch (desc->prot) {
 177 +                               case 1:
 178 +                               case 2:
 179 +                               case 5:
 180 +                               case 6:
 181 +                               case 13:
 182 +                               case 14:
 183 +                                       if (desc->l4f)
 184 +                                               break;
 185
 186 -               /* RX Hardware checksum offload */
 187 -               switch (desc->prot) {
 188 -                       case 1:
 189 -                       case 2:
 190 -                       case 5:
 191 -                       case 6:
 192 -                       case 13:
 193 -                       case 14:
 194 -                               if (desc->l4f)
 195 -                                       skb->ip_summed = CHECKSUM_NONE;
 196 -                               else
 197                                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 198 -                       break;
 199 -                       default:
 200 -                               skb->ip_summed = CHECKSUM_NONE;
 201 -                       break;
 202 -               }
 203 +                                       break;
 204 +                               default:
 205 +                               break;
 206 +                       }
 207
 208 -               napi_gro_receive(napi, skb);
 209 +                       napi_gro_receive(napi, skb);
 210
 211 -               received++;
 212 +                       sw->frag_first = NULL;
 213 +                       sw->frag_last = NULL;
 214 +               }
 215
 216 +               received++;
 217                 if (++i == RX_DESCS) {
 218                         i = 0;
 219                         desc = &(rx_ring)->desc[i];
 220 @@ -671,12 +709,6 @@ static int eth_xmit(struct sk_buff *skb,
 221         if (pmap == 8)
 222                 pmap = (1 << 4);
 223
 224 -       if (skb->len > CNS3XXX_MAX_MTU) {
 225 -               dev_kfree_skb(skb);
 226 -               dev->stats.tx_errors++;
 227 -               return NETDEV_TX_OK;
 228 -       }
 229 -
 230         spin_lock(&tx_lock);
 231
 232         if ((tx_ring->num_used + nr_frags) >= TX_DESCS) {
 233 @@ -701,8 +733,7 @@ static int eth_xmit(struct sk_buff *skb,
 234
 235                 len = skb->len;
 236
 237 -               phys = dma_map_single(NULL, skb->data, len,
 238 -                                       DMA_TO_DEVICE);
 239 +               phys = dma_map_single(NULL, skb->data, len, DMA_TO_DEVICE);
 240
 241                 tx_desc->sdp = phys;
 242                 tx_desc->pmap = pmap;
 243 @@ -849,24 +880,24 @@ static int init_rings(struct sw *sw)
 244         /* Setup RX buffers */
 245         for (i = 0; i < RX_DESCS; i++) {
 246                 struct rx_desc *desc = &(rx_ring)->desc[i];
 247 -               struct sk_buff *skb;
 248 -               if (!(skb = dev_alloc_skb(MAX_MRU)))
 249 +               void *buf;
 250 +
 251 +               buf = kzalloc(RX_SEGMENT_ALLOC_SIZE, GFP_KERNEL);
 252 +               if (!buf)
 253                         return -ENOMEM;
 254 -               if (SKB_DMA_REALIGN)
 255 -                       skb_reserve(skb, SKB_DMA_REALIGN);
 256 -               skb_reserve(skb, NET_IP_ALIGN);
 257 -               desc->sdl = CNS3XXX_MAX_MTU;
 258 +
 259 +               desc->sdl = RX_SEGMENT_MRU;
 260                 if (i == (RX_DESCS - 1))
 261                         desc->eor = 1;
 262                 desc->fsd = 1;
 263                 desc->lsd = 1;
 264
 265 -               desc->sdp = dma_map_single(NULL, skb->data,
 266 -                                           CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
 267 -               if (dma_mapping_error(NULL, desc->sdp)) {
 268 +               desc->sdp = dma_map_single(NULL, buf + SKB_HEAD_ALIGN,
 269 +                                          RX_SEGMENT_MRU, DMA_FROM_DEVICE);
 270 +               if (dma_mapping_error(NULL, desc->sdp))
 271                         return -EIO;
 272 -               }
 273 -               rx_ring->buff_tab[i] = skb;
 274 +
 275 +               rx_ring->buff_tab[i] = buf;
 276                 rx_ring->phys_tab[i] = desc->sdp;
 277                 desc->cown = 0;
 278         }
 279 @@ -905,12 +936,13 @@ static void destroy_rings(struct sw *sw)
 280                         struct _rx_ring *rx_ring = sw->rx_ring;
 281                         struct rx_desc *desc = &(rx_ring)->desc[i];
 282                         struct sk_buff *skb = sw->rx_ring->buff_tab[i];
 283 -                       if (skb) {
 284 -                               dma_unmap_single(NULL,
 285 -                                                desc->sdp,
 286 -                                                CNS3XXX_MAX_MTU, DMA_FROM_DEVICE);
 287 -                               dev_kfree_skb(skb);
 288 -                       }
 289 +
 290 +                       if (!skb)
 291 +                               continue;
 292 +
 293 +                       dma_unmap_single(NULL, desc->sdp, RX_SEGMENT_MRU,
 294 +                                        DMA_FROM_DEVICE);
 295 +                       dev_kfree_skb(skb);
 296                 }
 297                 dma_pool_free(rx_dma_pool, sw->rx_ring->desc, sw->rx_ring->phys_addr);
 298                 dma_pool_destroy(rx_dma_pool);
 299 @@ -1085,13 +1117,22 @@ static int eth_set_mac(struct net_device
 300         return 0;
 301  }
 302
 303 +static int cns3xxx_change_mtu(struct net_device *dev, int new_mtu)
 304 +{
 305 +       if (new_mtu > MAX_MTU)
 306 +               return -EINVAL;
 307 +
 308 +       dev->mtu = new_mtu;
 309 +       return 0;
 310 +}
 311 +
 312  static const struct net_device_ops cns3xxx_netdev_ops = {
 313         .ndo_open = eth_open,
 314         .ndo_stop = eth_close,
 315         .ndo_start_xmit = eth_xmit,
 316         .ndo_set_rx_mode = eth_rx_mode,
 317         .ndo_do_ioctl = eth_ioctl,
 318 -       .ndo_change_mtu = eth_change_mtu,
 319 +       .ndo_change_mtu = cns3xxx_change_mtu,
 320         .ndo_set_mac_address = eth_set_mac,
 321         .ndo_validate_addr = eth_validate_addr,
 322  };
 323 @@ -1124,6 +1165,10 @@ static int __devinit eth_init_one(struct
 324                 goto err_free;
 325         }
 326
 327 +       temp = __raw_readl(&sw->regs->phy_auto_addr);
 328 +       temp |= (3 << 30); /* maximum frame length: 9600 bytes */
 329 +       __raw_writel(temp, &sw->regs->phy_auto_addr);
 330 +
 331         for (i = 0; i < 4; i++) {
 332                 temp = __raw_readl(&sw->regs->mac_cfg[i]);
 333                 temp |= (PORT_DISABLE);