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Date: Fri, 09 May 2008 02:22:16 +0200
From: Brice Goglin <brice@...i.com>
To: Jeff Garzik <jeff@...zik.org>
CC: netdev@...r.kernel.org
Subject: [PATCH 15/16] myri10ge: add Direct Cache Access support
Add I/O AT DCA (Direct Cache Access) support.
Signed-off-by: Brice Goglin <brice@...i.com>
Signed-off-by: Andrew Gallatin <gallatin@...i.com>
---
drivers/net/myri10ge/myri10ge.c | 146 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 145 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/net/myri10ge/myri10ge.c
===================================================================
--- linux-2.6.orig/drivers/net/myri10ge/myri10ge.c 2008-05-09 00:15:17.000000000 +0200
+++ linux-2.6/drivers/net/myri10ge/myri10ge.c 2008-05-09 00:31:15.000000000 +0200
@@ -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>
@@ -185,6 +186,11 @@
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];
};
@@ -212,6 +218,9 @@
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;
@@ -335,6 +344,10 @@
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)
@@ -878,6 +891,9 @@
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 */
@@ -970,6 +986,20 @@
}
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;
@@ -995,6 +1025,77 @@
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)
@@ -1362,6 +1463,11 @@
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);
@@ -1586,6 +1692,9 @@
"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",
@@ -1662,6 +1771,10 @@
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 */
@@ -3687,7 +3800,9 @@
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;
@@ -3788,6 +3903,9 @@
netdev = mgp->dev;
unregister_netdev(netdev);
+#ifdef CONFIG_DCA
+ myri10ge_teardown_dca(mgp);
+#endif
myri10ge_dummy_rdma(mgp, 0);
/* avoid a memory leak */
@@ -3830,6 +3948,26 @@
#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,
@@ -3842,6 +3980,9 @@
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);
}
@@ -3850,6 +3991,9 @@
static __exit void myri10ge_cleanup_module(void)
{
+#ifdef CONFIG_DCA
+ dca_unregister_notify(&myri10ge_dca_notifier);
+#endif
pci_unregister_driver(&myri10ge_driver);
}
--
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