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igb: Expose RSS indirection table for ethtool

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This patch adds the ethtool callbacks necessary to change the RETA
indirection table from userspace.

In order to achieve this, we add the indirection table field (rss_indir_tbl)
in the board specific data structure (struct igb_adapter) to preserve the
values across hardware resets.

The indirection table must be initialized with default values in the
following cases:
	* at module init time
	* when the number of RX queues changes.
For this reason we add a new field (rss_indir_tbl_init) in igb_adapter
that keeps track of the number of RX queues. Whenever the number of RX
queues changes, the rss_indir_tbl is modified and initialized with default
values. The rss_indir_tbl_init is updated accordingly.

CC: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Laura Mihaela Vasilescu <laura.vasilescu@rosedu.org>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Laura Mihaela Vasilescu 2013-07-31 20:19:54 +00:00 committed by Jeff Kirsher
parent c342b39ea7
commit ed12cc9a14
3 changed files with 97 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/intel/igb/igb.h
View File

@ -446,6 +446,8 @@ struct igb_adapter {
struct i2c_algo_bit_data i2c_algo;
struct i2c_adapter i2c_adap;
struct i2c_client *i2c_client;
u32 rss_indir_tbl_init;
u8 rss_indir_tbl[IGB_RETA_SIZE];
};
#define IGB_FLAG_HAS_MSI (1 << 0)
@ -482,6 +484,7 @@ extern int igb_up(struct igb_adapter *);
extern void igb_down(struct igb_adapter *);
extern void igb_reinit_locked(struct igb_adapter *);
extern void igb_reset(struct igb_adapter *);
extern void igb_write_rss_indir_tbl(struct igb_adapter *);
extern int igb_set_spd_dplx(struct igb_adapter *, u32, u8);
extern int igb_setup_tx_resources(struct igb_ring *);
extern int igb_setup_rx_resources(struct igb_ring *);

87
drivers/net/ethernet/intel/igb/igb_ethtool.c
View File

@ -2784,6 +2784,90 @@ static void igb_ethtool_complete(struct net_device *netdev)
pm_runtime_put(&adapter->pdev->dev);
}
static u32 igb_get_rxfh_indir_size(struct net_device *netdev)
{
return IGB_RETA_SIZE;
}
static int igb_get_rxfh_indir(struct net_device *netdev, u32 *indir)
{
struct igb_adapter *adapter = netdev_priv(netdev);
int i;
for (i = 0; i < IGB_RETA_SIZE; i++)
indir[i] = adapter->rss_indir_tbl[i];
return 0;
}
void igb_write_rss_indir_tbl(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
u32 reg = E1000_RETA(0);
u32 shift = 0;
int i = 0;
switch (hw->mac.type) {
case e1000_82575:
shift = 6;
break;
case e1000_82576:
/* 82576 supports 2 RSS queues for SR-IOV */
if (adapter->vfs_allocated_count)
shift = 3;
break;
default:
break;
}
while (i < IGB_RETA_SIZE) {
u32 val = 0;
int j;
for (j = 3; j >= 0; j--) {
val <<= 8;
val |= adapter->rss_indir_tbl[i + j];
}
wr32(reg, val << shift);
reg += 4;
i += 4;
}
}
static int igb_set_rxfh_indir(struct net_device *netdev, const u32 *indir)
{
struct igb_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
int i;
u32 num_queues;
num_queues = adapter->rss_queues;
switch (hw->mac.type) {
case e1000_82576:
/* 82576 supports 2 RSS queues for SR-IOV */
if (adapter->vfs_allocated_count)
num_queues = 2;
break;
default:
break;
}
/* Verify user input. */
for (i = 0; i < IGB_RETA_SIZE; i++)
if (indir[i] >= num_queues)
return -EINVAL;
for (i = 0; i < IGB_RETA_SIZE; i++)
adapter->rss_indir_tbl[i] = indir[i];
igb_write_rss_indir_tbl(adapter);
return 0;
}
static const struct ethtool_ops igb_ethtool_ops = {
.get_settings = igb_get_settings,
.set_settings = igb_set_settings,
@ -2817,6 +2901,9 @@ static const struct ethtool_ops igb_ethtool_ops = {
.set_eee = igb_set_eee,
.get_module_info = igb_get_module_info,
.get_module_eeprom = igb_get_module_eeprom,
.get_rxfh_indir_size = igb_get_rxfh_indir_size,
.get_rxfh_indir = igb_get_rxfh_indir,
.set_rxfh_indir = igb_set_rxfh_indir,
.begin = igb_ethtool_begin,
.complete = igb_ethtool_complete,
};

28
drivers/net/ethernet/intel/igb/igb_main.c
View File

@ -3126,7 +3126,7 @@ static void igb_setup_mrqc(struct igb_adapter *adapter)
{
struct e1000_hw *hw = &adapter->hw;
u32 mrqc, rxcsum;
u32 j, num_rx_queues, shift = 0;
u32 j, num_rx_queues;
static const u32 rsskey[10] = { 0xDA565A6D, 0xC20E5B25, 0x3D256741,
0xB08FA343, 0xCB2BCAD0, 0xB4307BAE,
0xA32DCB77, 0x0CF23080, 0x3BB7426A,
@ -3139,35 +3139,21 @@ static void igb_setup_mrqc(struct igb_adapter *adapter)
num_rx_queues = adapter->rss_queues;
switch (hw->mac.type) {
case e1000_82575:
shift = 6;
break;
case e1000_82576:
/* 82576 supports 2 RSS queues for SR-IOV */
if (adapter->vfs_allocated_count) {
shift = 3;
if (adapter->vfs_allocated_count)
num_rx_queues = 2;
}
break;
default:
break;
}
/* Populate the indirection table 4 entries at a time. To do this
* we are generating the results for n and n+2 and then interleaving
* those with the results with n+1 and n+3.
*/
for (j = 0; j < IGB_RETA_SIZE / 4; j++) {
/* first pass generates n and n+2 */
u32 base = ((j * 0x00040004) + 0x00020000) * num_rx_queues;
u32 reta = (base & 0x07800780) >> (7 - shift);
/* second pass generates n+1 and n+3 */
base += 0x00010001 * num_rx_queues;
reta |= (base & 0x07800780) << (1 + shift);
wr32(E1000_RETA(j), reta);
if (adapter->rss_indir_tbl_init != num_rx_queues) {
for (j = 0; j < IGB_RETA_SIZE; j++)
adapter->rss_indir_tbl[j] = (j * num_rx_queues) / IGB_RETA_SIZE;
adapter->rss_indir_tbl_init = num_rx_queues;
}
igb_write_rss_indir_tbl(adapter);
/* Disable raw packet checksumming so that RSS hash is placed in
* descriptor on writeback. No need to enable TCP/UDP/IP checksum