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Message-Id: <1327562515-29664-7-git-send-email-jeffrey.t.kirsher@intel.com>
Date: Wed, 25 Jan 2012 23:21:49 -0800
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Bruce Allan <bruce.w.allan@...el.com>, netdev@...r.kernel.org,
gospo@...hat.com, sassmann@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 06/12] e1000e: re-factor ethtool get/set ring parameter
From: Bruce Allan <bruce.w.allan@...el.com>
Make it more like how igb does it, with some additional error checking.
Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/e1000e/ethtool.c | 136 +++++++++++++++------------
1 files changed, 77 insertions(+), 59 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 01c73ae..ffb6c14 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -605,94 +605,112 @@ static void e1000_get_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
struct e1000_adapter *adapter = netdev_priv(netdev);
- struct e1000_ring *tx_ring = adapter->tx_ring;
- struct e1000_ring *rx_ring = adapter->rx_ring;
ring->rx_max_pending = E1000_MAX_RXD;
ring->tx_max_pending = E1000_MAX_TXD;
- ring->rx_pending = rx_ring->count;
- ring->tx_pending = tx_ring->count;
+ ring->rx_pending = adapter->rx_ring_count;
+ ring->tx_pending = adapter->tx_ring_count;
}
static int e1000_set_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
struct e1000_adapter *adapter = netdev_priv(netdev);
- struct e1000_ring *tx_ring, *tx_old;
- struct e1000_ring *rx_ring, *rx_old;
- int err;
+ struct e1000_ring *temp_tx = NULL, *temp_rx = NULL;
+ int err = 0, size = sizeof(struct e1000_ring);
+ bool set_tx = false, set_rx = false;
+ u16 new_rx_count, new_tx_count;
if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
return -EINVAL;
- while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
- usleep_range(1000, 2000);
+ new_rx_count = clamp_t(u32, ring->rx_pending, E1000_MIN_RXD,
+ E1000_MAX_RXD);
+ new_rx_count = ALIGN(new_rx_count, REQ_RX_DESCRIPTOR_MULTIPLE);
- if (netif_running(adapter->netdev))
- e1000e_down(adapter);
+ new_tx_count = clamp_t(u32, ring->tx_pending, E1000_MIN_TXD,
+ E1000_MAX_TXD);
+ new_tx_count = ALIGN(new_tx_count, REQ_TX_DESCRIPTOR_MULTIPLE);
- tx_old = adapter->tx_ring;
- rx_old = adapter->rx_ring;
+ if ((new_tx_count == adapter->tx_ring_count) &&
+ (new_rx_count == adapter->rx_ring_count))
+ /* nothing to do */
+ return 0;
- err = -ENOMEM;
- tx_ring = kmemdup(tx_old, sizeof(struct e1000_ring), GFP_KERNEL);
- if (!tx_ring)
- goto err_alloc_tx;
+ while (test_and_set_bit(__E1000_RESETTING, &adapter->state))
+ usleep_range(1000, 2000);
- rx_ring = kmemdup(rx_old, sizeof(struct e1000_ring), GFP_KERNEL);
- if (!rx_ring)
- goto err_alloc_rx;
+ if (!netif_running(adapter->netdev)) {
+ /* Set counts now and allocate resources during open() */
+ adapter->tx_ring->count = new_tx_count;
+ adapter->rx_ring->count = new_rx_count;
+ adapter->tx_ring_count = new_tx_count;
+ adapter->rx_ring_count = new_rx_count;
+ goto clear_reset;
+ }
- adapter->tx_ring = tx_ring;
- adapter->rx_ring = rx_ring;
+ set_tx = (new_tx_count != adapter->tx_ring_count);
+ set_rx = (new_rx_count != adapter->rx_ring_count);
- rx_ring->count = max(ring->rx_pending, (u32)E1000_MIN_RXD);
- rx_ring->count = min(rx_ring->count, (u32)(E1000_MAX_RXD));
- rx_ring->count = ALIGN(rx_ring->count, REQ_RX_DESCRIPTOR_MULTIPLE);
+ /* Allocate temporary storage for ring updates */
+ if (set_tx) {
+ temp_tx = vmalloc(size);
+ if (!temp_tx) {
+ err = -ENOMEM;
+ goto free_temp;
+ }
+ }
+ if (set_rx) {
+ temp_rx = vmalloc(size);
+ if (!temp_rx) {
+ err = -ENOMEM;
+ goto free_temp;
+ }
+ }
- tx_ring->count = max(ring->tx_pending, (u32)E1000_MIN_TXD);
- tx_ring->count = min(tx_ring->count, (u32)(E1000_MAX_TXD));
- tx_ring->count = ALIGN(tx_ring->count, REQ_TX_DESCRIPTOR_MULTIPLE);
+ e1000e_down(adapter);
- if (netif_running(adapter->netdev)) {
- /* Try to get new resources before deleting old */
- err = e1000e_setup_rx_resources(rx_ring);
+ /*
+ * We can't just free everything and then setup again, because the
+ * ISRs in MSI-X mode get passed pointers to the Tx and Rx ring
+ * structs. First, attempt to allocate new resources...
+ */
+ if (set_tx) {
+ memcpy(temp_tx, adapter->tx_ring, size);
+ temp_tx->count = new_tx_count;
+ err = e1000e_setup_tx_resources(temp_tx);
if (err)
- goto err_setup_rx;
- err = e1000e_setup_tx_resources(tx_ring);
+ goto err_setup;
+ }
+ if (set_rx) {
+ memcpy(temp_rx, adapter->rx_ring, size);
+ temp_rx->count = new_rx_count;
+ err = e1000e_setup_rx_resources(temp_rx);
if (err)
- goto err_setup_tx;
+ goto err_setup_rx;
+ }
- /*
- * restore the old in order to free it,
- * then add in the new
- */
- adapter->rx_ring = rx_old;
- adapter->tx_ring = tx_old;
- e1000e_free_rx_resources(adapter->rx_ring);
+ /* ...then free the old resources and copy back any new ring data */
+ if (set_tx) {
e1000e_free_tx_resources(adapter->tx_ring);
- kfree(tx_old);
- kfree(rx_old);
- adapter->rx_ring = rx_ring;
- adapter->tx_ring = tx_ring;
- err = e1000e_up(adapter);
- if (err)
- goto err_setup;
+ memcpy(adapter->tx_ring, temp_tx, size);
+ adapter->tx_ring_count = new_tx_count;
+ }
+ if (set_rx) {
+ e1000e_free_rx_resources(adapter->rx_ring);
+ memcpy(adapter->rx_ring, temp_rx, size);
+ adapter->rx_ring_count = new_rx_count;
}
- clear_bit(__E1000_RESETTING, &adapter->state);
- return 0;
-err_setup_tx:
- e1000e_free_rx_resources(rx_ring);
err_setup_rx:
- adapter->rx_ring = rx_old;
- adapter->tx_ring = tx_old;
- kfree(rx_ring);
-err_alloc_rx:
- kfree(tx_ring);
-err_alloc_tx:
- e1000e_up(adapter);
+ if (err && set_tx)
+ e1000e_free_tx_resources(temp_tx);
err_setup:
+ e1000e_up(adapter);
+free_temp:
+ vfree(temp_tx);
+ vfree(temp_rx);
+clear_reset:
clear_bit(__E1000_RESETTING, &adapter->state);
return err;
}
--
1.7.7.6
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