/* unmap remaining buffers */
while (tx_desc != eop_desc) {
- tx_desc->wb.status = 0;
-
tx_buffer++;
tx_desc++;
i++;
}
}
- tx_desc->wb.status = 0;
-
/* move us one more past the eop_desc for start of next pkt */
tx_buffer++;
tx_desc++;
type_tucmd, mss_l4len_idx);
}
-static int ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
- struct ixgbevf_tx_buffer *first)
+static __le32 ixgbevf_tx_cmd_type(u32 tx_flags)
{
- dma_addr_t dma;
- struct sk_buff *skb = first->skb;
- struct ixgbevf_tx_buffer *tx_buffer_info;
- unsigned int len;
- unsigned int total = skb->len;
- unsigned int offset = 0, size;
- int count = 0;
- unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
- unsigned int f;
- int i;
+ /* set type for advanced descriptor with frame checksum insertion */
+ __le32 cmd_type = cpu_to_le32(IXGBE_ADVTXD_DTYP_DATA |
+ IXGBE_ADVTXD_DCMD_IFCS |
+ IXGBE_ADVTXD_DCMD_DEXT);
- i = tx_ring->next_to_use;
+ /* set HW vlan bit if vlan is present */
+ if (tx_flags & IXGBE_TX_FLAGS_VLAN)
+ cmd_type |= cpu_to_le32(IXGBE_ADVTXD_DCMD_VLE);
- len = min(skb_headlen(skb), total);
- while (len) {
- tx_buffer_info = &tx_ring->tx_buffer_info[i];
- size = min(len, (unsigned int)IXGBE_MAX_DATA_PER_TXD);
+ /* set segmentation enable bits for TSO/FSO */
+ if (tx_flags & IXGBE_TX_FLAGS_TSO)
+ cmd_type |= cpu_to_le32(IXGBE_ADVTXD_DCMD_TSE);
- tx_buffer_info->tx_flags = first->tx_flags;
- dma = dma_map_single(tx_ring->dev, skb->data + offset,
- size, DMA_TO_DEVICE);
- if (dma_mapping_error(tx_ring->dev, dma))
- goto dma_error;
+ return cmd_type;
+}
- /* record length, and DMA address */
- dma_unmap_len_set(tx_buffer_info, len, size);
- dma_unmap_addr_set(tx_buffer_info, dma, dma);
+static void ixgbevf_tx_olinfo_status(union ixgbe_adv_tx_desc *tx_desc,
+ u32 tx_flags, unsigned int paylen)
+{
+ __le32 olinfo_status = cpu_to_le32(paylen << IXGBE_ADVTXD_PAYLEN_SHIFT);
- len -= size;
- total -= size;
- offset += size;
- count++;
- i++;
- if (i == tx_ring->count)
- i = 0;
- }
+ /* enable L4 checksum for TSO and TX checksum offload */
+ if (tx_flags & IXGBE_TX_FLAGS_CSUM)
+ olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_TXSM);
- for (f = 0; f < nr_frags; f++) {
- const struct skb_frag_struct *frag;
+ /* enble IPv4 checksum for TSO */
+ if (tx_flags & IXGBE_TX_FLAGS_IPV4)
+ olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_IXSM);
- frag = &skb_shinfo(skb)->frags[f];
- len = min((unsigned int)skb_frag_size(frag), total);
- offset = 0;
+ /* use index 1 context for TSO/FSO/FCOE */
+ if (tx_flags & IXGBE_TX_FLAGS_TSO)
+ olinfo_status |= cpu_to_le32(1 << IXGBE_ADVTXD_IDX_SHIFT);
- while (len) {
- tx_buffer_info = &tx_ring->tx_buffer_info[i];
- size = min(len, (unsigned int)IXGBE_MAX_DATA_PER_TXD);
+ /* Check Context must be set if Tx switch is enabled, which it
+ * always is for case where virtual functions are running
+ */
+ olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_CC);
- dma = skb_frag_dma_map(tx_ring->dev, frag,
- offset, size, DMA_TO_DEVICE);
- if (dma_mapping_error(tx_ring->dev, dma))
- goto dma_error;
+ tx_desc->read.olinfo_status = olinfo_status;
+}
- /* record length, and DMA address */
- dma_unmap_len_set(tx_buffer_info, len, size);
- dma_unmap_addr_set(tx_buffer_info, dma, dma);
+static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
+ struct ixgbevf_tx_buffer *first,
+ const u8 hdr_len)
+{
+ dma_addr_t dma;
+ struct sk_buff *skb = first->skb;
+ struct ixgbevf_tx_buffer *tx_buffer;
+ union ixgbe_adv_tx_desc *tx_desc;
+ struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
+ unsigned int data_len = skb->data_len;
+ unsigned int size = skb_headlen(skb);
+ unsigned int paylen = skb->len - hdr_len;
+ u32 tx_flags = first->tx_flags;
+ __le32 cmd_type;
+ u16 i = tx_ring->next_to_use;
- len -= size;
- total -= size;
- offset += size;
- count++;
- i++;
- if (i == tx_ring->count)
- i = 0;
- }
- if (total == 0)
- break;
- }
+ tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
- if (i == 0)
- i = tx_ring->count - 1;
- else
- i = i - 1;
+ ixgbevf_tx_olinfo_status(tx_desc, tx_flags, paylen);
+ cmd_type = ixgbevf_tx_cmd_type(tx_flags);
- first->next_to_watch = IXGBEVF_TX_DESC(tx_ring, i);
- first->time_stamp = jiffies;
+ dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(tx_ring->dev, dma))
+ goto dma_error;
- return count;
+ /* record length, and DMA address */
+ dma_unmap_len_set(first, len, size);
+ dma_unmap_addr_set(first, dma, dma);
-dma_error:
- dev_err(tx_ring->dev, "TX DMA map failed\n");
+ tx_desc->read.buffer_addr = cpu_to_le64(dma);
- /* clear timestamp and dma mappings for failed tx_buffer_info map */
- tx_buffer_info->dma = 0;
- count--;
+ for (;;) {
+ while (unlikely(size > IXGBE_MAX_DATA_PER_TXD)) {
+ tx_desc->read.cmd_type_len =
+ cmd_type | cpu_to_le32(IXGBE_MAX_DATA_PER_TXD);
- /* clear timestamp and dma mappings for remaining portion of packet */
- while (count >= 0) {
- count--;
- i--;
- if (i < 0)
- i += tx_ring->count;
- tx_buffer_info = &tx_ring->tx_buffer_info[i];
- ixgbevf_unmap_and_free_tx_resource(tx_ring, tx_buffer_info);
- }
+ i++;
+ tx_desc++;
+ if (i == tx_ring->count) {
+ tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
+ i = 0;
+ }
- return count;
-}
+ dma += IXGBE_MAX_DATA_PER_TXD;
+ size -= IXGBE_MAX_DATA_PER_TXD;
-static void ixgbevf_tx_queue(struct ixgbevf_ring *tx_ring,
- struct ixgbevf_tx_buffer *first,
- int count, u8 hdr_len)
-{
- union ixgbe_adv_tx_desc *tx_desc = NULL;
- struct sk_buff *skb = first->skb;
- struct ixgbevf_tx_buffer *tx_buffer_info;
- u32 olinfo_status = 0, cmd_type_len = 0;
- u32 tx_flags = first->tx_flags;
- unsigned int i;
+ tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ tx_desc->read.olinfo_status = 0;
+ }
- u32 txd_cmd = IXGBE_TXD_CMD_EOP | IXGBE_TXD_CMD_RS | IXGBE_TXD_CMD_IFCS;
+ if (likely(!data_len))
+ break;
- cmd_type_len |= IXGBE_ADVTXD_DTYP_DATA;
+ tx_desc->read.cmd_type_len = cmd_type | cpu_to_le32(size);
- cmd_type_len |= IXGBE_ADVTXD_DCMD_IFCS | IXGBE_ADVTXD_DCMD_DEXT;
+ i++;
+ tx_desc++;
+ if (i == tx_ring->count) {
+ tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
+ i = 0;
+ }
- if (tx_flags & IXGBE_TX_FLAGS_VLAN)
- cmd_type_len |= IXGBE_ADVTXD_DCMD_VLE;
+ size = skb_frag_size(frag);
+ data_len -= size;
- if (tx_flags & IXGBE_TX_FLAGS_CSUM)
- olinfo_status |= IXGBE_ADVTXD_POPTS_TXSM;
+ dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(tx_ring->dev, dma))
+ goto dma_error;
- if (tx_flags & IXGBE_TX_FLAGS_TSO) {
- cmd_type_len |= IXGBE_ADVTXD_DCMD_TSE;
+ tx_buffer = &tx_ring->tx_buffer_info[i];
+ dma_unmap_len_set(tx_buffer, len, size);
+ dma_unmap_addr_set(tx_buffer, dma, dma);
- /* use index 1 context for tso */
- olinfo_status |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
- if (tx_flags & IXGBE_TX_FLAGS_IPV4)
- olinfo_status |= IXGBE_ADVTXD_POPTS_IXSM;
+ tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ tx_desc->read.olinfo_status = 0;
+
+ frag++;
}
- /*
- * Check Context must be set if Tx switch is enabled, which it
- * always is for case where virtual functions are running
+ /* write last descriptor with RS and EOP bits */
+ cmd_type |= cpu_to_le32(size) | cpu_to_le32(IXGBE_TXD_CMD);
+ tx_desc->read.cmd_type_len = cmd_type;
+
+ /* set the timestamp */
+ first->time_stamp = jiffies;
+
+ /* Force memory writes to complete before letting h/w know there
+ * are new descriptors to fetch. (Only applicable for weak-ordered
+ * memory model archs, such as IA-64).
+ *
+ * We also need this memory barrier (wmb) to make certain all of the
+ * status bits have been updated before next_to_watch is written.
*/
- olinfo_status |= IXGBE_ADVTXD_CC;
+ wmb();
- olinfo_status |= ((skb->len - hdr_len) << IXGBE_ADVTXD_PAYLEN_SHIFT);
+ /* set next_to_watch value indicating a packet is present */
+ first->next_to_watch = tx_desc;
- i = tx_ring->next_to_use;
- while (count--) {
- dma_addr_t dma;
- unsigned int len;
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
- tx_buffer_info = &tx_ring->tx_buffer_info[i];
- dma = dma_unmap_addr(tx_buffer_info, dma);
- len = dma_unmap_len(tx_buffer_info, len);
- tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
- tx_desc->read.buffer_addr = cpu_to_le64(dma);
- tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type_len | len);
- tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
- i++;
- if (i == tx_ring->count)
- i = 0;
- }
+ tx_ring->next_to_use = i;
- tx_desc->read.cmd_type_len |= cpu_to_le32(txd_cmd);
+ /* notify HW of packet */
+ writel(i, tx_ring->tail);
+
+ return;
+dma_error:
+ dev_err(tx_ring->dev, "TX DMA map failed\n");
+
+ /* clear dma mappings for failed tx_buffer_info map */
+ for (;;) {
+ tx_buffer = &tx_ring->tx_buffer_info[i];
+ ixgbevf_unmap_and_free_tx_resource(tx_ring, tx_buffer);
+ if (tx_buffer == first)
+ break;
+ if (i == 0)
+ i = tx_ring->count;
+ i--;
+ }
tx_ring->next_to_use = i;
}
else
ixgbevf_tx_csum(tx_ring, first);
- ixgbevf_tx_queue(tx_ring, first,
- ixgbevf_tx_map(tx_ring, first), hdr_len);
-
- /* Force memory writes to complete before letting h/w
- * know there are new descriptors to fetch. (Only
- * applicable for weak-ordered memory model archs,
- * such as IA-64).
- */
- wmb();
+ ixgbevf_tx_map(tx_ring, first, hdr_len);
- writel(tx_ring->next_to_use, tx_ring->tail);
ixgbevf_maybe_stop_tx(tx_ring, DESC_NEEDED);
return NETDEV_TX_OK;
projects / ~andy / linux / commitdiff