myri10ge: add Direct Cache Access support
Add I/O AT DCA (Direct Cache Access) support. Signed-off-by: Brice Goglin <brice@myri.com> Signed-off-by: Andrew Gallatin <gallatin@myri.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Brice Goglin
Jeff Garzik
parent
0dcffac1a3
commit
981813d8e0
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@ -49,6 +49,7 @@
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#include <linux/if_ether.h>
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#include <linux/if_vlan.h>
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#include <linux/inet_lro.h>
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#include <linux/dca.h>
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#include <linux/ip.h>
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#include <linux/inet.h>
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#include <linux/in.h>
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@ -185,6 +186,11 @@ struct myri10ge_slice_state {
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dma_addr_t fw_stats_bus;
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int watchdog_tx_done;
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int watchdog_tx_req;
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#ifdef CONFIG_DCA
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int cached_dca_tag;
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int cpu;
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__be32 __iomem *dca_tag;
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#endif
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char irq_desc[32];
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};
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@ -212,6 +218,9 @@ struct myri10ge_priv {
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int msi_enabled;
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int msix_enabled;
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struct msix_entry *msix_vectors;
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#ifdef CONFIG_DCA
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int dca_enabled;
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#endif
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u32 link_state;
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unsigned int rdma_tags_available;
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int intr_coal_delay;
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@ -335,6 +344,10 @@ static int myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
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module_param(myri10ge_rss_hash, int, S_IRUGO);
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MODULE_PARM_DESC(myri10ge_rss_hash, "Type of RSS hashing to do");
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static int myri10ge_dca = 1;
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module_param(myri10ge_dca, int, S_IRUGO);
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MODULE_PARM_DESC(myri10ge_dca, "Enable DCA if possible");
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#define MYRI10GE_FW_OFFSET 1024*1024
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#define MYRI10GE_HIGHPART_TO_U32(X) \
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(sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
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@ -878,6 +891,9 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
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struct myri10ge_slice_state *ss;
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int i, status;
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size_t bytes;
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#ifdef CONFIG_DCA
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unsigned long dca_tag_off;
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#endif
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/* try to send a reset command to the card to see if it
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* is alive */
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@ -970,6 +986,20 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
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}
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put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);
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#ifdef CONFIG_DCA
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status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_DCA_OFFSET, &cmd, 0);
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dca_tag_off = cmd.data0;
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for (i = 0; i < mgp->num_slices; i++) {
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ss = &mgp->ss[i];
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if (status == 0) {
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ss->dca_tag = (__iomem __be32 *)
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(mgp->sram + dca_tag_off + 4 * i);
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} else {
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ss->dca_tag = NULL;
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}
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}
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#endif /* CONFIG_DCA */
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/* reset mcp/driver shared state back to 0 */
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mgp->link_changes = 0;
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@ -995,6 +1025,77 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
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return status;
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}
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#ifdef CONFIG_DCA
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static void
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myri10ge_write_dca(struct myri10ge_slice_state *ss, int cpu, int tag)
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{
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ss->cpu = cpu;
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ss->cached_dca_tag = tag;
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put_be32(htonl(tag), ss->dca_tag);
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}
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static inline void myri10ge_update_dca(struct myri10ge_slice_state *ss)
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{
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int cpu = get_cpu();
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int tag;
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if (cpu != ss->cpu) {
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tag = dca_get_tag(cpu);
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if (ss->cached_dca_tag != tag)
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myri10ge_write_dca(ss, cpu, tag);
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}
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put_cpu();
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}
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static void myri10ge_setup_dca(struct myri10ge_priv *mgp)
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{
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int err, i;
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struct pci_dev *pdev = mgp->pdev;
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if (mgp->ss[0].dca_tag == NULL || mgp->dca_enabled)
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return;
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if (!myri10ge_dca) {
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dev_err(&pdev->dev, "dca disabled by administrator\n");
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return;
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}
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err = dca_add_requester(&pdev->dev);
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if (err) {
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dev_err(&pdev->dev,
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"dca_add_requester() failed, err=%d\n", err);
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return;
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}
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mgp->dca_enabled = 1;
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for (i = 0; i < mgp->num_slices; i++)
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myri10ge_write_dca(&mgp->ss[i], -1, 0);
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}
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static void myri10ge_teardown_dca(struct myri10ge_priv *mgp)
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{
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struct pci_dev *pdev = mgp->pdev;
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int err;
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if (!mgp->dca_enabled)
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return;
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mgp->dca_enabled = 0;
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err = dca_remove_requester(&pdev->dev);
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}
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static int myri10ge_notify_dca_device(struct device *dev, void *data)
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{
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struct myri10ge_priv *mgp;
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unsigned long event;
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mgp = dev_get_drvdata(dev);
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event = *(unsigned long *)data;
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if (event == DCA_PROVIDER_ADD)
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myri10ge_setup_dca(mgp);
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else if (event == DCA_PROVIDER_REMOVE)
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myri10ge_teardown_dca(mgp);
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return 0;
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}
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#endif /* CONFIG_DCA */
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static inline void
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myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
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struct mcp_kreq_ether_recv *src)
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@ -1362,6 +1463,11 @@ static int myri10ge_poll(struct napi_struct *napi, int budget)
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struct net_device *netdev = ss->mgp->dev;
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int work_done;
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#ifdef CONFIG_DCA
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if (ss->mgp->dca_enabled)
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myri10ge_update_dca(ss);
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#endif
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/* process as many rx events as NAPI will allow */
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work_done = myri10ge_clean_rx_done(ss, budget);
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@ -1586,6 +1692,9 @@ static const char myri10ge_gstrings_main_stats[][ETH_GSTRING_LEN] = {
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"tx_boundary", "WC", "irq", "MSI", "MSIX",
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"read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
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"serial_number", "watchdog_resets",
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#ifdef CONFIG_DCA
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"dca_capable", "dca_enabled",
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#endif
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"link_changes", "link_up", "dropped_link_overflow",
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"dropped_link_error_or_filtered",
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"dropped_pause", "dropped_bad_phy", "dropped_bad_crc32",
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@ -1662,6 +1771,10 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
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data[i++] = (unsigned int)mgp->read_write_dma;
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data[i++] = (unsigned int)mgp->serial_number;
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data[i++] = (unsigned int)mgp->watchdog_resets;
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#ifdef CONFIG_DCA
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data[i++] = (unsigned int)(mgp->ss[0].dca_tag != NULL);
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data[i++] = (unsigned int)(mgp->dca_enabled);
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#endif
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data[i++] = (unsigned int)mgp->link_changes;
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/* firmware stats are useful only in the first slice */
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@ -3687,7 +3800,9 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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dev_err(&pdev->dev, "failed reset\n");
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goto abort_with_slices;
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}
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#ifdef CONFIG_DCA
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myri10ge_setup_dca(mgp);
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#endif
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pci_set_drvdata(pdev, mgp);
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if ((myri10ge_initial_mtu + ETH_HLEN) > MYRI10GE_MAX_ETHER_MTU)
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myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
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@ -3788,6 +3903,9 @@ static void myri10ge_remove(struct pci_dev *pdev)
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netdev = mgp->dev;
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unregister_netdev(netdev);
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#ifdef CONFIG_DCA
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myri10ge_teardown_dca(mgp);
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#endif
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myri10ge_dummy_rdma(mgp, 0);
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/* avoid a memory leak */
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@ -3830,6 +3948,26 @@ static struct pci_driver myri10ge_driver = {
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#endif
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};
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#ifdef CONFIG_DCA
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static int
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myri10ge_notify_dca(struct notifier_block *nb, unsigned long event, void *p)
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{
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int err = driver_for_each_device(&myri10ge_driver.driver,
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NULL, &event,
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myri10ge_notify_dca_device);
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if (err)
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return NOTIFY_BAD;
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return NOTIFY_DONE;
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}
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static struct notifier_block myri10ge_dca_notifier = {
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.notifier_call = myri10ge_notify_dca,
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.next = NULL,
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.priority = 0,
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};
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#endif /* CONFIG_DCA */
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static __init int myri10ge_init_module(void)
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{
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printk(KERN_INFO "%s: Version %s\n", myri10ge_driver.name,
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@ -3842,6 +3980,9 @@ static __init int myri10ge_init_module(void)
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myri10ge_driver.name, myri10ge_rss_hash);
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myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
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}
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#ifdef CONFIG_DCA
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dca_register_notify(&myri10ge_dca_notifier);
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#endif
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return pci_register_driver(&myri10ge_driver);
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}
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@ -3850,6 +3991,9 @@ module_init(myri10ge_init_module);
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static __exit void myri10ge_cleanup_module(void)
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{
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#ifdef CONFIG_DCA
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dca_unregister_notify(&myri10ge_dca_notifier);
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#endif
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pci_unregister_driver(&myri10ge_driver);
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}
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