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Date: Tue, 08 Jan 2008 11:04:59 -0800
From: "Kok, Auke" <auke-jan.h.kok@...el.com>
To: David Miller <davem@...emloft.net>
CC: netdev@...r.kernel.org,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
"Ronciak, John" <john.ronciak@...el.com>
Subject: Re: [PATCH 7/7]: [NET]: Make ->poll() breakout consistent in Intel
ethernet drivers.
David Miller wrote:
> [NET]: Make ->poll() breakout consistent in Intel ethernet drivers.
>
> This makes the ->poll() routines of the E100, E1000, E1000E, IXGB, and
> IXGBE drivers complete ->poll() consistently.
>
> Now they will all break out when the amount of RX work done is less
> than 'budget'.
>
> At a later time, we may want put back code to include the TX work as
> well (as at least one other NAPI driver does, but by in large NAPI
> drivers do not do this). But if so, it should be done consistently
> across the board to all of these drivers.
>
> Signed-off-by: David S. Miller <davem@...emloft.net>
this is exactly the change I was eyeballing and indeed this seems to be the
general use case in most drivers anyway.
I'll try to see how this impacts the (especially 4-port) TX performance issue with
e1000e, but this should be just fine for now, and we can address later anyway.
Acked-by: Auke Kok <auke-jan.h.kok@...el.com>
Auke
> ---
> drivers/net/e100.c | 7 +++----
> drivers/net/e1000/e1000_main.c | 10 +++++-----
> drivers/net/e1000e/netdev.c | 8 ++++----
> drivers/net/ixgb/ixgb_main.c | 7 +++----
> drivers/net/ixgbe/ixgbe_main.c | 8 ++++----
> 5 files changed, 19 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/net/e100.c b/drivers/net/e100.c
> index 68316f1..b87402b 100644
> --- a/drivers/net/e100.c
> +++ b/drivers/net/e100.c
> @@ -1991,13 +1991,12 @@ static int e100_poll(struct napi_struct *napi, int budget)
> struct nic *nic = container_of(napi, struct nic, napi);
> struct net_device *netdev = nic->netdev;
> unsigned int work_done = 0;
> - int tx_cleaned;
>
> e100_rx_clean(nic, &work_done, budget);
> - tx_cleaned = e100_tx_clean(nic);
> + e100_tx_clean(nic);
>
> - /* If no Rx and Tx cleanup work was done, exit polling mode. */
> - if((!tx_cleaned && (work_done == 0))) {
> + /* If budget not fully consumed, exit the polling mode */
> + if (work_done < budget) {
> netif_rx_complete(netdev, napi);
> e100_enable_irq(nic);
> }
> diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
> index 9de7144..13d57b0 100644
> --- a/drivers/net/e1000/e1000_main.c
> +++ b/drivers/net/e1000/e1000_main.c
> @@ -3919,7 +3919,7 @@ e1000_clean(struct napi_struct *napi, int budget)
> {
> struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter, napi);
> struct net_device *poll_dev = adapter->netdev;
> - int tx_cleaned = 0, work_done = 0;
> + int work_done = 0;
>
> /* Must NOT use netdev_priv macro here. */
> adapter = poll_dev->priv;
> @@ -3929,16 +3929,16 @@ e1000_clean(struct napi_struct *napi, int budget)
> * simultaneously. A failure obtaining the lock means
> * tx_ring[0] is currently being cleaned anyway. */
> if (spin_trylock(&adapter->tx_queue_lock)) {
> - tx_cleaned = e1000_clean_tx_irq(adapter,
> - &adapter->tx_ring[0]);
> + e1000_clean_tx_irq(adapter,
> + &adapter->tx_ring[0]);
> spin_unlock(&adapter->tx_queue_lock);
> }
>
> adapter->clean_rx(adapter, &adapter->rx_ring[0],
> &work_done, budget);
>
> - /* If no Tx and not enough Rx work done, exit the polling mode */
> - if ((!tx_cleaned && (work_done == 0))) {
> + /* If budget not fully consumed, exit the polling mode */
> + if (work_done < budget) {
> if (likely(adapter->itr_setting & 3))
> e1000_set_itr(adapter);
> netif_rx_complete(poll_dev, napi);
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index dd9698c..4a6fc74 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -1384,7 +1384,7 @@ static int e1000_clean(struct napi_struct *napi, int budget)
> {
> struct e1000_adapter *adapter = container_of(napi, struct e1000_adapter, napi);
> struct net_device *poll_dev = adapter->netdev;
> - int tx_cleaned = 0, work_done = 0;
> + int work_done = 0;
>
> /* Must NOT use netdev_priv macro here. */
> adapter = poll_dev->priv;
> @@ -1394,14 +1394,14 @@ static int e1000_clean(struct napi_struct *napi, int budget)
> * simultaneously. A failure obtaining the lock means
> * tx_ring is currently being cleaned anyway. */
> if (spin_trylock(&adapter->tx_queue_lock)) {
> - tx_cleaned = e1000_clean_tx_irq(adapter);
> + e1000_clean_tx_irq(adapter);
> spin_unlock(&adapter->tx_queue_lock);
> }
>
> adapter->clean_rx(adapter, &work_done, budget);
>
> - /* If no Tx and not enough Rx work done, exit the polling mode */
> - if ((!tx_cleaned && (work_done < budget))) {
> + /* If budget not fully consumed, exit the polling mode */
> + if (work_done < budget) {
> if (adapter->itr_setting & 3)
> e1000_set_itr(adapter);
> netif_rx_complete(poll_dev, napi);
> diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
> index a8bef52..d2fb88d 100644
> --- a/drivers/net/ixgb/ixgb_main.c
> +++ b/drivers/net/ixgb/ixgb_main.c
> @@ -1787,14 +1787,13 @@ ixgb_clean(struct napi_struct *napi, int budget)
> {
> struct ixgb_adapter *adapter = container_of(napi, struct ixgb_adapter, napi);
> struct net_device *netdev = adapter->netdev;
> - int tx_cleaned;
> int work_done = 0;
>
> - tx_cleaned = ixgb_clean_tx_irq(adapter);
> + ixgb_clean_tx_irq(adapter);
> ixgb_clean_rx_irq(adapter, &work_done, budget);
>
> - /* if no Tx and not enough Rx work done, exit the polling mode */
> - if((!tx_cleaned && (work_done == 0))) {
> + /* If budget not fully consumed, exit the polling mode */
> + if (work_done < budget) {
> netif_rx_complete(netdev, napi);
> ixgb_irq_enable(adapter);
> }
> diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
> index 7c31930..a564916 100644
> --- a/drivers/net/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ixgbe/ixgbe_main.c
> @@ -1468,15 +1468,15 @@ static int ixgbe_clean(struct napi_struct *napi, int budget)
> struct ixgbe_adapter *adapter = container_of(napi,
> struct ixgbe_adapter, napi);
> struct net_device *netdev = adapter->netdev;
> - int tx_cleaned = 0, work_done = 0;
> + int work_done = 0;
>
> /* In non-MSIX case, there is no multi-Tx/Rx queue */
> - tx_cleaned = ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
> + ixgbe_clean_tx_irq(adapter, adapter->tx_ring);
> ixgbe_clean_rx_irq(adapter, &adapter->rx_ring[0], &work_done,
> budget);
>
> - /* If no Tx and not enough Rx work done, exit the polling mode */
> - if ((!tx_cleaned && (work_done < budget))) {
> + /* If budget not fully consumed, exit the polling mode */
> + if (work_done < budget) {
> netif_rx_complete(netdev, napi);
> ixgbe_irq_enable(adapter);
> }
--
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