#include "xgbe.h"
#include "xgbe-common.h"
-static void xgbe_unmap_skb(struct xgbe_prv_data *, struct xgbe_ring_data *);
+static void xgbe_unmap_rdata(struct xgbe_prv_data *, struct xgbe_ring_data *);
static void xgbe_free_ring(struct xgbe_prv_data *pdata,
struct xgbe_ring *ring)
if (ring->rdata) {
for (i = 0; i < ring->rdesc_count; i++) {
rdata = XGBE_GET_DESC_DATA(ring, i);
- xgbe_unmap_skb(pdata, rdata);
+ xgbe_unmap_rdata(pdata, rdata);
}
kfree(ring->rdata);
ring->rdata = NULL;
}
+ if (ring->rx_pa.pages) {
+ dma_unmap_page(pdata->dev, ring->rx_pa.pages_dma,
+ ring->rx_pa.pages_len, DMA_FROM_DEVICE);
+ put_page(ring->rx_pa.pages);
+
+ ring->rx_pa.pages = NULL;
+ ring->rx_pa.pages_len = 0;
+ ring->rx_pa.pages_offset = 0;
+ ring->rx_pa.pages_dma = 0;
+ }
+
if (ring->rdesc) {
dma_free_coherent(pdata->dev,
(sizeof(struct xgbe_ring_desc) *
return ret;
}
+static int xgbe_map_rx_buffer(struct xgbe_prv_data *pdata,
+ struct xgbe_ring *ring,
+ struct xgbe_ring_data *rdata)
+{
+ if (!ring->rx_pa.pages) {
+ struct page *pages = NULL;
+ dma_addr_t pages_dma;
+ gfp_t gfp;
+ int order, ret;
+
+ /* Try to obtain pages, decreasing order if necessary */
+ gfp = GFP_ATOMIC | __GFP_COLD | __GFP_COMP;
+ order = max_t(int, PAGE_ALLOC_COSTLY_ORDER, 1);
+ while (--order >= 0) {
+ pages = alloc_pages(gfp, order);
+ if (pages)
+ break;
+ }
+ if (!pages)
+ return -ENOMEM;
+
+ /* Map the pages */
+ pages_dma = dma_map_page(pdata->dev, pages, 0,
+ PAGE_SIZE << order, DMA_FROM_DEVICE);
+ ret = dma_mapping_error(pdata->dev, pages_dma);
+ if (ret) {
+ put_page(pages);
+ return ret;
+ }
+
+ /* Set the values for this ring */
+ ring->rx_pa.pages = pages;
+ ring->rx_pa.pages_len = PAGE_SIZE << order;
+ ring->rx_pa.pages_offset = 0;
+ ring->rx_pa.pages_dma = pages_dma;
+ }
+
+ get_page(ring->rx_pa.pages);
+ rdata->rx_pa = ring->rx_pa;
+
+ rdata->rx_dma = ring->rx_pa.pages_dma + ring->rx_pa.pages_offset;
+ rdata->rx_dma_len = pdata->rx_buf_size;
+
+ ring->rx_pa.pages_offset += pdata->rx_buf_size;
+ if ((ring->rx_pa.pages_offset + pdata->rx_buf_size) >
+ ring->rx_pa.pages_len) {
+ /* This data descriptor is responsible for unmapping page(s) */
+ rdata->rx_unmap = ring->rx_pa;
+
+ /* Get a new allocation next time */
+ ring->rx_pa.pages = NULL;
+ ring->rx_pa.pages_len = 0;
+ ring->rx_pa.pages_offset = 0;
+ ring->rx_pa.pages_dma = 0;
+ }
+
+ return 0;
+}
+
static void xgbe_wrapper_tx_descriptor_init(struct xgbe_prv_data *pdata)
{
struct xgbe_hw_if *hw_if = &pdata->hw_if;
struct xgbe_ring *ring;
struct xgbe_ring_desc *rdesc;
struct xgbe_ring_data *rdata;
- dma_addr_t rdesc_dma, skb_dma;
- struct sk_buff *skb = NULL;
+ dma_addr_t rdesc_dma;
unsigned int i, j;
DBGPR("-->xgbe_wrapper_rx_descriptor_init\n");
rdata->rdesc = rdesc;
rdata->rdesc_dma = rdesc_dma;
- /* Allocate skb & assign to each rdesc */
- skb = dev_alloc_skb(pdata->rx_buf_size);
- if (skb == NULL)
- break;
- skb_dma = dma_map_single(pdata->dev, skb->data,
- pdata->rx_buf_size,
- DMA_FROM_DEVICE);
- if (dma_mapping_error(pdata->dev, skb_dma)) {
- netdev_alert(pdata->netdev,
- "failed to do the dma map\n");
- dev_kfree_skb_any(skb);
+ if (xgbe_map_rx_buffer(pdata, ring, rdata))
break;
- }
- rdata->skb = skb;
- rdata->skb_dma = skb_dma;
- rdata->skb_dma_len = pdata->rx_buf_size;
rdesc++;
rdesc_dma += sizeof(struct xgbe_ring_desc);
DBGPR("<--xgbe_wrapper_rx_descriptor_init\n");
}
-static void xgbe_unmap_skb(struct xgbe_prv_data *pdata,
- struct xgbe_ring_data *rdata)
+static void xgbe_unmap_rdata(struct xgbe_prv_data *pdata,
+ struct xgbe_ring_data *rdata)
{
if (rdata->skb_dma) {
if (rdata->mapped_as_page) {
rdata->skb = NULL;
}
+ if (rdata->rx_pa.pages)
+ put_page(rdata->rx_pa.pages);
+
+ if (rdata->rx_unmap.pages) {
+ dma_unmap_page(pdata->dev, rdata->rx_unmap.pages_dma,
+ rdata->rx_unmap.pages_len, DMA_FROM_DEVICE);
+ put_page(rdata->rx_unmap.pages);
+ }
+
+ memset(&rdata->rx_pa, 0, sizeof(rdata->rx_pa));
+ memset(&rdata->rx_unmap, 0, sizeof(rdata->rx_unmap));
+
+ rdata->rx_dma = 0;
+ rdata->rx_dma_len = 0;
+
rdata->tso_header = 0;
rdata->len = 0;
rdata->interrupt = 0;
err_out:
while (start_index < cur_index) {
rdata = XGBE_GET_DESC_DATA(ring, start_index++);
- xgbe_unmap_skb(pdata, rdata);
+ xgbe_unmap_rdata(pdata, rdata);
}
DBGPR("<--xgbe_map_tx_skb: count=0\n");
return 0;
}
-static void xgbe_realloc_skb(struct xgbe_channel *channel)
+static void xgbe_realloc_rx_buffer(struct xgbe_channel *channel)
{
struct xgbe_prv_data *pdata = channel->pdata;
struct xgbe_hw_if *hw_if = &pdata->hw_if;
struct xgbe_ring *ring = channel->rx_ring;
struct xgbe_ring_data *rdata;
- struct sk_buff *skb = NULL;
- dma_addr_t skb_dma;
int i;
- DBGPR("-->xgbe_realloc_skb: rx_ring->rx.realloc_index = %u\n",
+ DBGPR("-->xgbe_realloc_rx_buffer: rx_ring->rx.realloc_index = %u\n",
ring->rx.realloc_index);
for (i = 0; i < ring->dirty; i++) {
rdata = XGBE_GET_DESC_DATA(ring, ring->rx.realloc_index);
/* Reset rdata values */
- xgbe_unmap_skb(pdata, rdata);
+ xgbe_unmap_rdata(pdata, rdata);
- /* Allocate skb & assign to each rdesc */
- skb = dev_alloc_skb(pdata->rx_buf_size);
- if (skb == NULL)
+ if (xgbe_map_rx_buffer(pdata, ring, rdata))
break;
- skb_dma = dma_map_single(pdata->dev, skb->data,
- pdata->rx_buf_size, DMA_FROM_DEVICE);
- if (dma_mapping_error(pdata->dev, skb_dma)) {
- netdev_alert(pdata->netdev,
- "failed to do the dma map\n");
- dev_kfree_skb_any(skb);
- break;
- }
- rdata->skb = skb;
- rdata->skb_dma = skb_dma;
- rdata->skb_dma_len = pdata->rx_buf_size;
hw_if->rx_desc_reset(rdata);
}
ring->dirty = 0;
- DBGPR("<--xgbe_realloc_skb\n");
+ DBGPR("<--xgbe_realloc_rx_buffer\n");
}
void xgbe_init_function_ptrs_desc(struct xgbe_desc_if *desc_if)
desc_if->alloc_ring_resources = xgbe_alloc_ring_resources;
desc_if->free_ring_resources = xgbe_free_ring_resources;
desc_if->map_tx_skb = xgbe_map_tx_skb;
- desc_if->realloc_skb = xgbe_realloc_skb;
- desc_if->unmap_skb = xgbe_unmap_skb;
+ desc_if->realloc_rx_buffer = xgbe_realloc_rx_buffer;
+ desc_if->unmap_rdata = xgbe_unmap_rdata;
desc_if->wrapper_tx_desc_init = xgbe_wrapper_tx_descriptor_init;
desc_if->wrapper_rx_desc_init = xgbe_wrapper_rx_descriptor_init;
rdesc->desc1 = 0;
rdesc->desc2 = 0;
rdesc->desc3 = 0;
+
+ /* Make sure ownership is written to the descriptor */
+ wmb();
}
static void xgbe_tx_desc_init(struct xgbe_channel *channel)
{
struct xgbe_ring *ring = channel->tx_ring;
struct xgbe_ring_data *rdata;
- struct xgbe_ring_desc *rdesc;
int i;
int start_index = ring->cur;
/* Initialze all descriptors */
for (i = 0; i < ring->rdesc_count; i++) {
rdata = XGBE_GET_DESC_DATA(ring, i);
- rdesc = rdata->rdesc;
- /* Initialize Tx descriptor
- * Set buffer 1 (lo) address to zero
- * Set buffer 1 (hi) address to zero
- * Reset all other control bits (IC, TTSE, B2L & B1L)
- * Reset all other control bits (OWN, CTXT, FD, LD, CPC, CIC,
- * etc)
- */
- rdesc->desc0 = 0;
- rdesc->desc1 = 0;
- rdesc->desc2 = 0;
- rdesc->desc3 = 0;
+ /* Initialize Tx descriptor */
+ xgbe_tx_desc_reset(rdata);
}
- /* Make sure everything is written to the descriptor(s) before
- * telling the device about them
- */
- wmb();
-
/* Update the total number of Tx descriptors */
XGMAC_DMA_IOWRITE(channel, DMA_CH_TDRLR, ring->rdesc_count - 1);
* Set buffer 2 (hi) address to zero and set control bits
* OWN and INTE
*/
- rdesc->desc0 = cpu_to_le32(lower_32_bits(rdata->skb_dma));
- rdesc->desc1 = cpu_to_le32(upper_32_bits(rdata->skb_dma));
+ rdesc->desc0 = cpu_to_le32(lower_32_bits(rdata->rx_dma));
+ rdesc->desc1 = cpu_to_le32(upper_32_bits(rdata->rx_dma));
rdesc->desc2 = 0;
rdesc->desc3 = 0;
struct xgbe_prv_data *pdata = channel->pdata;
struct xgbe_ring *ring = channel->rx_ring;
struct xgbe_ring_data *rdata;
- struct xgbe_ring_desc *rdesc;
unsigned int start_index = ring->cur;
unsigned int rx_coalesce, rx_frames;
unsigned int i;
/* Initialize all descriptors */
for (i = 0; i < ring->rdesc_count; i++) {
rdata = XGBE_GET_DESC_DATA(ring, i);
- rdesc = rdata->rdesc;
- /* Initialize Rx descriptor
- * Set buffer 1 (lo) address to dma address (lo)
- * Set buffer 1 (hi) address to dma address (hi)
- * Set buffer 2 (lo) address to zero
- * Set buffer 2 (hi) address to zero and set control
- * bits OWN and INTE appropriateley
- */
- rdesc->desc0 = cpu_to_le32(lower_32_bits(rdata->skb_dma));
- rdesc->desc1 = cpu_to_le32(upper_32_bits(rdata->skb_dma));
- rdesc->desc2 = 0;
- rdesc->desc3 = 0;
- XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, OWN, 1);
- XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, INTE, 1);
- rdata->interrupt = 1;
- if (rx_coalesce && (!rx_frames || ((i + 1) % rx_frames))) {
- /* Clear interrupt on completion bit */
- XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, INTE,
- 0);
+ /* Set interrupt on completion bit as appropriate */
+ if (rx_coalesce && (!rx_frames || ((i + 1) % rx_frames)))
rdata->interrupt = 0;
- }
- }
+ else
+ rdata->interrupt = 1;
- /* Make sure everything is written to the descriptors before
- * telling the device about them
- */
- wmb();
+ /* Initialize Rx descriptor */
+ xgbe_rx_desc_reset(rdata);
+ }
/* Update the total number of Rx descriptors */
XGMAC_DMA_IOWRITE(channel, DMA_CH_RDRLR, ring->rdesc_count - 1);
}
rx_buf_size = mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
- if (rx_buf_size < XGBE_RX_MIN_BUF_SIZE)
- rx_buf_size = XGBE_RX_MIN_BUF_SIZE;
+ rx_buf_size = clamp_val(rx_buf_size, XGBE_RX_MIN_BUF_SIZE, PAGE_SIZE);
+
rx_buf_size = (rx_buf_size + XGBE_RX_BUF_ALIGN - 1) &
~(XGBE_RX_BUF_ALIGN - 1);
DBGPR("<--xgbe_init_rx_coalesce\n");
}
-static void xgbe_free_tx_skbuff(struct xgbe_prv_data *pdata)
+static void xgbe_free_tx_data(struct xgbe_prv_data *pdata)
{
struct xgbe_desc_if *desc_if = &pdata->desc_if;
struct xgbe_channel *channel;
struct xgbe_ring_data *rdata;
unsigned int i, j;
- DBGPR("-->xgbe_free_tx_skbuff\n");
+ DBGPR("-->xgbe_free_tx_data\n");
channel = pdata->channel;
for (i = 0; i < pdata->channel_count; i++, channel++) {
for (j = 0; j < ring->rdesc_count; j++) {
rdata = XGBE_GET_DESC_DATA(ring, j);
- desc_if->unmap_skb(pdata, rdata);
+ desc_if->unmap_rdata(pdata, rdata);
}
}
- DBGPR("<--xgbe_free_tx_skbuff\n");
+ DBGPR("<--xgbe_free_tx_data\n");
}
-static void xgbe_free_rx_skbuff(struct xgbe_prv_data *pdata)
+static void xgbe_free_rx_data(struct xgbe_prv_data *pdata)
{
struct xgbe_desc_if *desc_if = &pdata->desc_if;
struct xgbe_channel *channel;
struct xgbe_ring_data *rdata;
unsigned int i, j;
- DBGPR("-->xgbe_free_rx_skbuff\n");
+ DBGPR("-->xgbe_free_rx_data\n");
channel = pdata->channel;
for (i = 0; i < pdata->channel_count; i++, channel++) {
for (j = 0; j < ring->rdesc_count; j++) {
rdata = XGBE_GET_DESC_DATA(ring, j);
- desc_if->unmap_skb(pdata, rdata);
+ desc_if->unmap_rdata(pdata, rdata);
}
}
- DBGPR("<--xgbe_free_rx_skbuff\n");
+ DBGPR("<--xgbe_free_rx_data\n");
}
static void xgbe_adjust_link(struct net_device *netdev)
xgbe_stop(pdata);
synchronize_irq(pdata->irq_number);
- xgbe_free_tx_skbuff(pdata);
- xgbe_free_rx_skbuff(pdata);
+ xgbe_free_tx_data(pdata);
+ xgbe_free_rx_data(pdata);
/* Issue software reset to device if requested */
if (reset)
struct xgbe_ring *ring = channel->rx_ring;
struct xgbe_ring_data *rdata;
- desc_if->realloc_skb(channel);
+ desc_if->realloc_rx_buffer(channel);
/* Update the Rx Tail Pointer Register with address of
* the last cleaned entry */
lower_32_bits(rdata->rdesc_dma));
}
+static struct sk_buff *xgbe_create_skb(struct xgbe_prv_data *pdata,
+ struct xgbe_ring_data *rdata,
+ unsigned int len)
+{
+ struct net_device *netdev = pdata->netdev;
+ struct sk_buff *skb;
+ u8 *packet;
+ unsigned int copy_len;
+
+ skb = netdev_alloc_skb_ip_align(netdev, XGBE_SKB_ALLOC_SIZE);
+ if (!skb)
+ return NULL;
+
+ packet = page_address(rdata->rx_pa.pages) + rdata->rx_pa.pages_offset;
+ copy_len = min_t(unsigned int, XGBE_SKB_ALLOC_SIZE, len);
+ skb_copy_to_linear_data(skb, packet, copy_len);
+ skb_put(skb, copy_len);
+
+ rdata->rx_pa.pages_offset += copy_len;
+ len -= copy_len;
+ if (len)
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+ rdata->rx_pa.pages,
+ rdata->rx_pa.pages_offset,
+ len, rdata->rx_dma_len);
+ else
+ put_page(rdata->rx_pa.pages);
+
+ return skb;
+}
+
static int xgbe_tx_poll(struct xgbe_channel *channel)
{
struct xgbe_prv_data *pdata = channel->pdata;
#endif
/* Free the SKB and reset the descriptor for re-use */
- desc_if->unmap_skb(pdata, rdata);
+ desc_if->unmap_rdata(pdata, rdata);
hw_if->tx_desc_reset(rdata);
processed++;
ring->cur++;
ring->dirty++;
- dma_unmap_single(pdata->dev, rdata->skb_dma,
- rdata->skb_dma_len, DMA_FROM_DEVICE);
- rdata->skb_dma = 0;
+ dma_sync_single_for_cpu(pdata->dev, rdata->rx_dma,
+ rdata->rx_dma_len,
+ DMA_FROM_DEVICE);
incomplete = XGMAC_GET_BITS(packet->attributes,
RX_PACKET_ATTRIBUTES,
if (!context) {
put_len = rdata->len - len;
- if (skb) {
- if (pskb_expand_head(skb, 0, put_len,
- GFP_ATOMIC)) {
- DBGPR("pskb_expand_head error\n");
- if (incomplete) {
- error = 1;
- goto read_again;
- }
-
- dev_kfree_skb(skb);
- goto next_packet;
+ len += put_len;
+
+ if (!skb) {
+ skb = xgbe_create_skb(pdata, rdata, put_len);
+ if (!skb) {
+ error = 1;
+ goto read_again;
}
- memcpy(skb_tail_pointer(skb), rdata->skb->data,
- put_len);
} else {
- skb = rdata->skb;
- rdata->skb = NULL;
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+ rdata->rx_pa.pages,
+ rdata->rx_pa.pages_offset,
+ put_len, rdata->rx_dma_len);
}
- skb_put(skb, put_len);
- len += put_len;
+
+ rdata->rx_pa.pages = NULL;
}
if (incomplete || context_next)
#define XGBE_RX_MIN_BUF_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
#define XGBE_RX_BUF_ALIGN 64
+#define XGBE_SKB_ALLOC_SIZE 256
#define XGBE_MAX_DMA_CHANNELS 16
#define XGBE_MAX_QUEUES 16
u32 desc3;
};
+/* Page allocation related values */
+struct xgbe_page_alloc {
+ struct page *pages;
+ unsigned int pages_len;
+ unsigned int pages_offset;
+
+ dma_addr_t pages_dma;
+};
+
/* Structure used to hold information related to the descriptor
* and the packet associated with the descriptor (always use
* use the XGBE_GET_DESC_DATA macro to access this data from the ring)
unsigned int skb_dma_len; /* Length of SKB DMA area */
unsigned int tso_header; /* TSO header indicator */
+ struct xgbe_page_alloc rx_pa; /* Rx buffer page allocation */
+ struct xgbe_page_alloc rx_unmap;
+
+ dma_addr_t rx_dma; /* DMA address of Rx buffer */
+ unsigned int rx_dma_len; /* Length of the Rx DMA buffer */
+
unsigned short len; /* Length of received Rx packet */
unsigned int interrupt; /* Interrupt indicator */
*/
struct xgbe_ring_data *rdata;
+ /* Page allocation for RX buffers */
+ struct xgbe_page_alloc rx_pa;
+
/* Ring index values
* cur - Tx: index of descriptor to be used for current transfer
* Rx: index of descriptor to check for packet availability
int (*alloc_ring_resources)(struct xgbe_prv_data *);
void (*free_ring_resources)(struct xgbe_prv_data *);
int (*map_tx_skb)(struct xgbe_channel *, struct sk_buff *);
- void (*realloc_skb)(struct xgbe_channel *);
- void (*unmap_skb)(struct xgbe_prv_data *, struct xgbe_ring_data *);
+ void (*realloc_rx_buffer)(struct xgbe_channel *);
+ void (*unmap_rdata)(struct xgbe_prv_data *, struct xgbe_ring_data *);
void (*wrapper_tx_desc_init)(struct xgbe_prv_data *);
void (*wrapper_rx_desc_init)(struct xgbe_prv_data *);
};
unsigned int rx_riwt;
unsigned int rx_frames;
- /* Current MTU */
+ /* Current Rx buffer size */
unsigned int rx_buf_size;
/* Flow control settings */
projects / karo-tx-linux.git / commitdiff