ibmveth: Add scatter-gather support
ibmveth can scatter gather up to 6 segments. If we go over this then we have no option but to call skb_linearize, like other drivers with similar limitations do. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Santiago Leon <santil@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Santiago Leon
David S. Miller
parent
f89e49e79f
commit
6e8ab30ec6
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@ -897,6 +897,7 @@ static const struct ethtool_ops netdev_ethtool_ops = {
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.get_strings = ibmveth_get_strings,
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.get_sset_count = ibmveth_get_sset_count,
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.get_ethtool_stats = ibmveth_get_ethtool_stats,
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.set_sg = ethtool_op_set_sg,
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};
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static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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@ -906,96 +907,158 @@ static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
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static int ibmveth_send(struct ibmveth_adapter *adapter,
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union ibmveth_buf_desc *descs)
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{
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unsigned long correlator;
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unsigned int retry_count;
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unsigned long ret;
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/*
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* The retry count sets a maximum for the number of broadcast and
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* multicast destinations within the system.
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*/
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retry_count = 1024;
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correlator = 0;
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do {
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ret = h_send_logical_lan(adapter->vdev->unit_address,
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descs[0].desc, descs[1].desc,
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descs[2].desc, descs[3].desc,
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descs[4].desc, descs[5].desc,
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correlator, &correlator);
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} while ((ret == H_BUSY) && (retry_count--));
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if (ret != H_SUCCESS && ret != H_DROPPED) {
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ibmveth_error_printk("tx: h_send_logical_lan failed with "
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"rc=%ld\n", ret);
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return 1;
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}
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return 0;
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}
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static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
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struct net_device *netdev)
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{
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struct ibmveth_adapter *adapter = netdev_priv(netdev);
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union ibmveth_buf_desc desc;
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unsigned long lpar_rc;
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unsigned long correlator;
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unsigned int retry_count;
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unsigned int tx_dropped = 0;
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unsigned int tx_bytes = 0;
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unsigned int tx_packets = 0;
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unsigned int tx_send_failed = 0;
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unsigned int tx_map_failed = 0;
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int used_bounce = 0;
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unsigned long data_dma_addr;
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unsigned int desc_flags;
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union ibmveth_buf_desc descs[6];
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int last, i;
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int force_bounce = 0;
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desc.fields.flags_len = IBMVETH_BUF_VALID | skb->len;
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if (skb->ip_summed == CHECKSUM_PARTIAL &&
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ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
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ibmveth_error_printk("tx: failed to checksum packet\n");
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tx_dropped++;
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/*
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* veth handles a maximum of 6 segments including the header, so
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* we have to linearize the skb if there are more than this.
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*/
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if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
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netdev->stats.tx_dropped++;
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goto out;
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}
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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unsigned char *buf = skb_transport_header(skb) + skb->csum_offset;
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/* veth can't checksum offload UDP */
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if (skb->ip_summed == CHECKSUM_PARTIAL &&
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ip_hdr(skb)->protocol != IPPROTO_TCP && skb_checksum_help(skb)) {
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ibmveth_error_printk("tx: failed to checksum packet\n");
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netdev->stats.tx_dropped++;
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goto out;
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}
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desc.fields.flags_len |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
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desc_flags = IBMVETH_BUF_VALID;
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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unsigned char *buf = skb_transport_header(skb) +
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skb->csum_offset;
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desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
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/* Need to zero out the checksum */
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buf[0] = 0;
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buf[1] = 0;
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}
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if (skb->len < tx_copybreak) {
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used_bounce = 1;
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} else {
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data_dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
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skb->len, DMA_TO_DEVICE);
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if (dma_mapping_error(&adapter->vdev->dev, data_dma_addr)) {
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if (!firmware_has_feature(FW_FEATURE_CMO))
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ibmveth_error_printk("tx: unable to map "
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"xmit buffer\n");
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tx_map_failed++;
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used_bounce = 1;
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}
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}
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retry_bounce:
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memset(descs, 0, sizeof(descs));
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if (used_bounce) {
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/*
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* If a linear packet is below the rx threshold then
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* copy it into the static bounce buffer. This avoids the
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* cost of a TCE insert and remove.
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*/
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if (force_bounce || (!skb_is_nonlinear(skb) &&
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(skb->len < tx_copybreak))) {
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skb_copy_from_linear_data(skb, adapter->bounce_buffer,
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skb->len);
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desc.fields.address = adapter->bounce_buffer_dma;
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} else
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desc.fields.address = data_dma_addr;
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/* send the frame. Arbitrarily set retrycount to 1024 */
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correlator = 0;
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retry_count = 1024;
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do {
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lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
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desc.desc, 0, 0, 0, 0, 0,
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correlator, &correlator);
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} while ((lpar_rc == H_BUSY) && (retry_count--));
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descs[0].fields.flags_len = desc_flags | skb->len;
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descs[0].fields.address = adapter->bounce_buffer_dma;
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if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
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ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
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ibmveth_error_printk("tx: valid=%d, len=%d, address=0x%08x\n",
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(desc.fields.flags_len & IBMVETH_BUF_VALID) ? 1 : 0,
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skb->len, desc.fields.address);
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tx_send_failed++;
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tx_dropped++;
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} else {
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tx_packets++;
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tx_bytes += skb->len;
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if (ibmveth_send(adapter, descs)) {
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adapter->tx_send_failed++;
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netdev->stats.tx_dropped++;
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} else {
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netdev->stats.tx_packets++;
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netdev->stats.tx_bytes += skb->len;
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}
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goto out;
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}
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if (!used_bounce)
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dma_unmap_single(&adapter->vdev->dev, data_dma_addr,
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skb->len, DMA_TO_DEVICE);
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/* Map the header */
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descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
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skb_headlen(skb),
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DMA_TO_DEVICE);
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if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
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goto map_failed;
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descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
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/* Map the frags */
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
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unsigned long dma_addr;
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skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
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dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
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frag->page_offset, frag->size,
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DMA_TO_DEVICE);
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if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
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goto map_failed_frags;
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descs[i+1].fields.flags_len = desc_flags | frag->size;
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descs[i+1].fields.address = dma_addr;
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}
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if (ibmveth_send(adapter, descs)) {
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adapter->tx_send_failed++;
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netdev->stats.tx_dropped++;
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} else {
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netdev->stats.tx_packets++;
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netdev->stats.tx_bytes += skb->len;
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}
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for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
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dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
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descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
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DMA_TO_DEVICE);
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out:
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netdev->stats.tx_dropped += tx_dropped;
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netdev->stats.tx_bytes += tx_bytes;
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netdev->stats.tx_packets += tx_packets;
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adapter->tx_send_failed += tx_send_failed;
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adapter->tx_map_failed += tx_map_failed;
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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map_failed_frags:
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last = i+1;
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for (i = 0; i < last; i++)
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dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
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descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
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DMA_TO_DEVICE);
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map_failed:
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if (!firmware_has_feature(FW_FEATURE_CMO))
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ibmveth_error_printk("tx: unable to map xmit buffer\n");
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adapter->tx_map_failed++;
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skb_linearize(skb);
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force_bounce = 1;
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goto retry_bounce;
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}
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static int ibmveth_poll(struct napi_struct *napi, int budget)
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@ -1316,6 +1379,7 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
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netdev->netdev_ops = &ibmveth_netdev_ops;
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netdev->ethtool_ops = &netdev_ethtool_ops;
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SET_NETDEV_DEV(netdev, &dev->dev);
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netdev->features |= NETIF_F_SG;
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memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
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