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myri10ge: add Direct Cache Access support
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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>
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Brice Goglin authored and Jeff Garzik committed May 31, 2008
1 parent 0dcffac commit 981813d
Showing 1 changed file with 145 additions and 1 deletion.
146 changes: 145 additions & 1 deletion drivers/net/myri10ge/myri10ge.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/inet_lro.h>
#include <linux/dca.h>
#include <linux/ip.h>
#include <linux/inet.h>
#include <linux/in.h>
Expand Down Expand Up @@ -185,6 +186,11 @@ struct myri10ge_slice_state {
dma_addr_t fw_stats_bus;
int watchdog_tx_done;
int watchdog_tx_req;
#ifdef CONFIG_DCA
int cached_dca_tag;
int cpu;
__be32 __iomem *dca_tag;
#endif
char irq_desc[32];
};

Expand Down Expand Up @@ -212,6 +218,9 @@ struct myri10ge_priv {
int msi_enabled;
int msix_enabled;
struct msix_entry *msix_vectors;
#ifdef CONFIG_DCA
int dca_enabled;
#endif
u32 link_state;
unsigned int rdma_tags_available;
int intr_coal_delay;
Expand Down Expand Up @@ -335,6 +344,10 @@ static int myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
module_param(myri10ge_rss_hash, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_rss_hash, "Type of RSS hashing to do");

static int myri10ge_dca = 1;
module_param(myri10ge_dca, int, S_IRUGO);
MODULE_PARM_DESC(myri10ge_dca, "Enable DCA if possible");

#define MYRI10GE_FW_OFFSET 1024*1024
#define MYRI10GE_HIGHPART_TO_U32(X) \
(sizeof (X) == 8) ? ((u32)((u64)(X) >> 32)) : (0)
Expand Down Expand Up @@ -878,6 +891,9 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
struct myri10ge_slice_state *ss;
int i, status;
size_t bytes;
#ifdef CONFIG_DCA
unsigned long dca_tag_off;
#endif

/* try to send a reset command to the card to see if it
* is alive */
Expand Down Expand Up @@ -970,6 +986,20 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
}
put_be32(htonl(mgp->intr_coal_delay), mgp->intr_coal_delay_ptr);

#ifdef CONFIG_DCA
status = myri10ge_send_cmd(mgp, MXGEFW_CMD_GET_DCA_OFFSET, &cmd, 0);
dca_tag_off = cmd.data0;
for (i = 0; i < mgp->num_slices; i++) {
ss = &mgp->ss[i];
if (status == 0) {
ss->dca_tag = (__iomem __be32 *)
(mgp->sram + dca_tag_off + 4 * i);
} else {
ss->dca_tag = NULL;
}
}
#endif /* CONFIG_DCA */

/* reset mcp/driver shared state back to 0 */

mgp->link_changes = 0;
Expand All @@ -995,6 +1025,77 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
return status;
}

#ifdef CONFIG_DCA
static void
myri10ge_write_dca(struct myri10ge_slice_state *ss, int cpu, int tag)
{
ss->cpu = cpu;
ss->cached_dca_tag = tag;
put_be32(htonl(tag), ss->dca_tag);
}

static inline void myri10ge_update_dca(struct myri10ge_slice_state *ss)
{
int cpu = get_cpu();
int tag;

if (cpu != ss->cpu) {
tag = dca_get_tag(cpu);
if (ss->cached_dca_tag != tag)
myri10ge_write_dca(ss, cpu, tag);
}
put_cpu();
}

static void myri10ge_setup_dca(struct myri10ge_priv *mgp)
{
int err, i;
struct pci_dev *pdev = mgp->pdev;

if (mgp->ss[0].dca_tag == NULL || mgp->dca_enabled)
return;
if (!myri10ge_dca) {
dev_err(&pdev->dev, "dca disabled by administrator\n");
return;
}
err = dca_add_requester(&pdev->dev);
if (err) {
dev_err(&pdev->dev,
"dca_add_requester() failed, err=%d\n", err);
return;
}
mgp->dca_enabled = 1;
for (i = 0; i < mgp->num_slices; i++)
myri10ge_write_dca(&mgp->ss[i], -1, 0);
}

static void myri10ge_teardown_dca(struct myri10ge_priv *mgp)
{
struct pci_dev *pdev = mgp->pdev;
int err;

if (!mgp->dca_enabled)
return;
mgp->dca_enabled = 0;
err = dca_remove_requester(&pdev->dev);
}

static int myri10ge_notify_dca_device(struct device *dev, void *data)
{
struct myri10ge_priv *mgp;
unsigned long event;

mgp = dev_get_drvdata(dev);
event = *(unsigned long *)data;

if (event == DCA_PROVIDER_ADD)
myri10ge_setup_dca(mgp);
else if (event == DCA_PROVIDER_REMOVE)
myri10ge_teardown_dca(mgp);
return 0;
}
#endif /* CONFIG_DCA */

static inline void
myri10ge_submit_8rx(struct mcp_kreq_ether_recv __iomem * dst,
struct mcp_kreq_ether_recv *src)
Expand Down Expand Up @@ -1362,6 +1463,11 @@ static int myri10ge_poll(struct napi_struct *napi, int budget)
struct net_device *netdev = ss->mgp->dev;
int work_done;

#ifdef CONFIG_DCA
if (ss->mgp->dca_enabled)
myri10ge_update_dca(ss);
#endif

/* process as many rx events as NAPI will allow */
work_done = myri10ge_clean_rx_done(ss, budget);

Expand Down Expand Up @@ -1586,6 +1692,9 @@ static const char myri10ge_gstrings_main_stats[][ETH_GSTRING_LEN] = {
"tx_boundary", "WC", "irq", "MSI", "MSIX",
"read_dma_bw_MBs", "write_dma_bw_MBs", "read_write_dma_bw_MBs",
"serial_number", "watchdog_resets",
#ifdef CONFIG_DCA
"dca_capable", "dca_enabled",
#endif
"link_changes", "link_up", "dropped_link_overflow",
"dropped_link_error_or_filtered",
"dropped_pause", "dropped_bad_phy", "dropped_bad_crc32",
Expand Down Expand Up @@ -1662,6 +1771,10 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
data[i++] = (unsigned int)mgp->read_write_dma;
data[i++] = (unsigned int)mgp->serial_number;
data[i++] = (unsigned int)mgp->watchdog_resets;
#ifdef CONFIG_DCA
data[i++] = (unsigned int)(mgp->ss[0].dca_tag != NULL);
data[i++] = (unsigned int)(mgp->dca_enabled);
#endif
data[i++] = (unsigned int)mgp->link_changes;

/* firmware stats are useful only in the first slice */
Expand Down Expand Up @@ -3687,7 +3800,9 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
dev_err(&pdev->dev, "failed reset\n");
goto abort_with_slices;
}

#ifdef CONFIG_DCA
myri10ge_setup_dca(mgp);
#endif
pci_set_drvdata(pdev, mgp);
if ((myri10ge_initial_mtu + ETH_HLEN) > MYRI10GE_MAX_ETHER_MTU)
myri10ge_initial_mtu = MYRI10GE_MAX_ETHER_MTU - ETH_HLEN;
Expand Down Expand Up @@ -3788,6 +3903,9 @@ static void myri10ge_remove(struct pci_dev *pdev)
netdev = mgp->dev;
unregister_netdev(netdev);

#ifdef CONFIG_DCA
myri10ge_teardown_dca(mgp);
#endif
myri10ge_dummy_rdma(mgp, 0);

/* avoid a memory leak */
Expand Down Expand Up @@ -3830,6 +3948,26 @@ static struct pci_driver myri10ge_driver = {
#endif
};

#ifdef CONFIG_DCA
static int
myri10ge_notify_dca(struct notifier_block *nb, unsigned long event, void *p)
{
int err = driver_for_each_device(&myri10ge_driver.driver,
NULL, &event,
myri10ge_notify_dca_device);

if (err)
return NOTIFY_BAD;
return NOTIFY_DONE;
}

static struct notifier_block myri10ge_dca_notifier = {
.notifier_call = myri10ge_notify_dca,
.next = NULL,
.priority = 0,
};
#endif /* CONFIG_DCA */

static __init int myri10ge_init_module(void)
{
printk(KERN_INFO "%s: Version %s\n", myri10ge_driver.name,
Expand All @@ -3842,6 +3980,9 @@ static __init int myri10ge_init_module(void)
myri10ge_driver.name, myri10ge_rss_hash);
myri10ge_rss_hash = MXGEFW_RSS_HASH_TYPE_SRC_PORT;
}
#ifdef CONFIG_DCA
dca_register_notify(&myri10ge_dca_notifier);
#endif

return pci_register_driver(&myri10ge_driver);
}
Expand All @@ -3850,6 +3991,9 @@ module_init(myri10ge_init_module);

static __exit void myri10ge_cleanup_module(void)
{
#ifdef CONFIG_DCA
dca_unregister_notify(&myri10ge_dca_notifier);
#endif
pci_unregister_driver(&myri10ge_driver);
}

Expand Down

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