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Date: Sun, 11 Jul 2010 15:01:17 -0700
From: Dimitris Michailidis <dm@...lsio.com>
To: netdev@...r.kernel.org
Cc: Dimitris Michailidis <dm@...lsio.com>
Subject: [PATCH net-next 3/5] cxgb4: add user manipulation of the RSS table
Implement the get_rxnfc, get_rxfh_indir, and set_rxfh_indir ethtool
methods for user manipulation of the RSS table. Besides the methods
themselves the rest of the changes here store, initialize, and write
the table contents.
Signed-off-by: Dimitris Michailidis <dm@...lsio.com>
---
drivers/net/cxgb4/cxgb4.h | 1 +
drivers/net/cxgb4/cxgb4_main.c | 113 ++++++++++++++++++++++++++++++++++------
2 files changed, 98 insertions(+), 16 deletions(-)
diff --git a/drivers/net/cxgb4/cxgb4.h b/drivers/net/cxgb4/cxgb4.h
index 62804bb..a614eb5 100644
--- a/drivers/net/cxgb4/cxgb4.h
+++ b/drivers/net/cxgb4/cxgb4.h
@@ -295,6 +295,7 @@ struct port_info {
u8 nqsets; /* # of qsets */
u8 first_qset; /* index of first qset */
struct link_config link_cfg;
+ u16 *rss;
};
/* port_info.rx_offload flags */
diff --git a/drivers/net/cxgb4/cxgb4_main.c b/drivers/net/cxgb4/cxgb4_main.c
index 653bb54..61d4313 100644
--- a/drivers/net/cxgb4/cxgb4_main.c
+++ b/drivers/net/cxgb4/cxgb4_main.c
@@ -597,30 +597,47 @@ static void free_msix_queue_irqs(struct adapter *adap)
}
/**
+ * write_rss - write the RSS table for a given port
+ * @pi: the port
+ * @queues: array of queue indices for RSS
+ *
+ * Sets up the portion of the HW RSS table for the port's VI to distribute
+ * packets to the Rx queues in @queues.
+ */
+static int write_rss(const struct port_info *pi, const u16 *queues)
+{
+ u16 *rss;
+ int i, err;
+ const struct sge_eth_rxq *q = &pi->adapter->sge.ethrxq[pi->first_qset];
+
+ rss = kmalloc(pi->rss_size * sizeof(u16), GFP_KERNEL);
+ if (!rss)
+ return -ENOMEM;
+
+ /* map the queue indices to queue ids */
+ for (i = 0; i < pi->rss_size; i++, queues++)
+ rss[i] = q[*queues].rspq.abs_id;
+
+ err = t4_config_rss_range(pi->adapter, 0, pi->viid, 0, pi->rss_size,
+ rss, pi->rss_size);
+ kfree(rss);
+ return err;
+}
+
+/**
* setup_rss - configure RSS
* @adap: the adapter
*
- * Sets up RSS to distribute packets to multiple receive queues. We
- * configure the RSS CPU lookup table to distribute to the number of HW
- * receive queues, and the response queue lookup table to narrow that
- * down to the response queues actually configured for each port.
- * We always configure the RSS mapping for all ports since the mapping
- * table has plenty of entries.
+ * Sets up RSS for each port.
*/
static int setup_rss(struct adapter *adap)
{
- int i, j, err;
- u16 rss[MAX_ETH_QSETS];
+ int i, err;
for_each_port(adap, i) {
const struct port_info *pi = adap2pinfo(adap, i);
- const struct sge_eth_rxq *q = &adap->sge.ethrxq[pi->first_qset];
-
- for (j = 0; j < pi->nqsets; j++)
- rss[j] = q[j].rspq.abs_id;
- err = t4_config_rss_range(adap, 0, pi->viid, 0, pi->rss_size,
- rss, pi->nqsets);
+ err = write_rss(pi, pi->rss);
if (err)
return err;
}
@@ -1802,6 +1819,46 @@ static int set_flags(struct net_device *dev, u32 flags)
return ethtool_op_set_flags(dev, flags, ETH_FLAG_RXHASH);
}
+static int get_rss_table(struct net_device *dev, struct ethtool_rxfh_indir *p)
+{
+ const struct port_info *pi = netdev_priv(dev);
+ unsigned int n = min_t(unsigned int, p->size, pi->rss_size);
+
+ p->size = pi->rss_size;
+ while (n--)
+ p->ring_index[n] = pi->rss[n];
+ return 0;
+}
+
+static int set_rss_table(struct net_device *dev,
+ const struct ethtool_rxfh_indir *p)
+{
+ unsigned int i;
+ struct port_info *pi = netdev_priv(dev);
+
+ if (p->size != pi->rss_size)
+ return -EINVAL;
+ for (i = 0; i < p->size; i++)
+ if (p->ring_index[i] >= pi->nqsets)
+ return -EINVAL;
+ for (i = 0; i < p->size; i++)
+ pi->rss[i] = p->ring_index[i];
+ if (pi->adapter->flags & FULL_INIT_DONE)
+ return write_rss(pi, pi->rss);
+ return 0;
+}
+
+static int get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
+ void *rules)
+{
+ switch (info->cmd) {
+ case ETHTOOL_GRXRINGS:
+ info->data = netdev2pinfo(dev)->nqsets;
+ return 0;
+ }
+ return -EOPNOTSUPP;
+}
+
static struct ethtool_ops cxgb_ethtool_ops = {
.get_settings = get_settings,
.set_settings = set_settings,
@@ -1833,6 +1890,9 @@ static struct ethtool_ops cxgb_ethtool_ops = {
.set_wol = set_wol,
.set_tso = set_tso,
.set_flags = set_flags,
+ .get_rxnfc = get_rxnfc,
+ .get_rxfh_indir = get_rss_table,
+ .set_rxfh_indir = set_rss_table,
.flash_device = set_flash,
};
@@ -3318,6 +3378,22 @@ static int __devinit enable_msix(struct adapter *adap)
#undef EXTRA_VECS
+static int __devinit init_rss(struct adapter *adap)
+{
+ unsigned int i, j;
+
+ for_each_port(adap, i) {
+ struct port_info *pi = adap2pinfo(adap, i);
+
+ pi->rss = kcalloc(pi->rss_size, sizeof(u16), GFP_KERNEL);
+ if (!pi->rss)
+ return -ENOMEM;
+ for (j = 0; j < pi->rss_size; j++)
+ pi->rss[j] = j % pi->nqsets;
+ }
+ return 0;
+}
+
static void __devinit print_port_info(struct adapter *adap)
{
static const char *base[] = {
@@ -3380,9 +3456,10 @@ static void free_some_resources(struct adapter *adapter)
disable_msi(adapter);
for_each_port(adapter, i)
- if (adapter->port[i])
+ if (adapter->port[i]) {
+ kfree(adap2pinfo(adapter, i)->rss);
free_netdev(adapter->port[i]);
-
+ }
if (adapter->flags & FW_OK)
t4_fw_bye(adapter, 0);
}
@@ -3536,6 +3613,10 @@ static int __devinit init_one(struct pci_dev *pdev,
else if (msi > 0 && pci_enable_msi(pdev) == 0)
adapter->flags |= USING_MSI;
+ err = init_rss(adapter);
+ if (err)
+ goto out_free_dev;
+
/*
* The card is now ready to go. If any errors occur during device
* registration we do not fail the whole card but rather proceed only
--
1.5.4
--
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