From d95d1081c3c3ed70a72b47cd578830c85c55da2e Mon Sep 17 00:00:00 2001 From: Jing Huang Date: Wed, 4 Apr 2012 05:43:48 +0000 Subject: [PATCH] bna: Remove tx tasklet The scheduling of tasklet and keeping the interrupts enabled makes interrupt reduntant. 20% of the Tx interrupts have nothing left to process or could not process as Tx tasklet was running. Signed-off-by: Jing Huang Signed-off-by: David S. Miller --- drivers/net/ethernet/brocade/bna/bnad.c | 73 +------------------------ drivers/net/ethernet/brocade/bna/bnad.h | 1 - 2 files changed, 3 insertions(+), 71 deletions(-) diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c index 032a306c0569..f1103e6f31c1 100644 --- a/drivers/net/ethernet/brocade/bna/bnad.c +++ b/drivers/net/ethernet/brocade/bna/bnad.c @@ -185,7 +185,6 @@ bnad_free_all_txbufs(struct bnad *bnad, * bnad_free_txbufs : Frees the Tx bufs on Tx completion * Can be called in a) Interrupt context * b) Sending context - * c) Tasklet context */ static u32 bnad_free_txbufs(struct bnad *bnad, @@ -197,13 +196,7 @@ bnad_free_txbufs(struct bnad *bnad, struct bnad_skb_unmap *unmap_array; struct sk_buff *skb; - /* - * Just return if TX is stopped. This check is useful - * when bnad_free_txbufs() runs out of a tasklet scheduled - * before bnad_cb_tx_cleanup() cleared BNAD_TXQ_TX_STARTED bit - * but this routine runs actually after the cleanup has been - * executed. - */ + /* Just return if TX is stopped */ if (!test_bit(BNAD_TXQ_TX_STARTED, &tcb->flags)) return 0; @@ -242,55 +235,6 @@ bnad_free_txbufs(struct bnad *bnad, return sent_packets; } -/* Tx Free Tasklet function */ -/* Frees for all the tcb's in all the Tx's */ -/* - * Scheduled from sending context, so that - * the fat Tx lock is not held for too long - * in the sending context. - */ -static void -bnad_tx_free_tasklet(unsigned long bnad_ptr) -{ - struct bnad *bnad = (struct bnad *)bnad_ptr; - struct bna_tcb *tcb; - u32 acked = 0; - int i, j; - - for (i = 0; i < bnad->num_tx; i++) { - for (j = 0; j < bnad->num_txq_per_tx; j++) { - tcb = bnad->tx_info[i].tcb[j]; - if (!tcb) - continue; - if (((u16) (*tcb->hw_consumer_index) != - tcb->consumer_index) && - (!test_and_set_bit(BNAD_TXQ_FREE_SENT, - &tcb->flags))) { - acked = bnad_free_txbufs(bnad, tcb); - if (likely(test_bit(BNAD_TXQ_TX_STARTED, - &tcb->flags))) - bna_ib_ack(tcb->i_dbell, acked); - smp_mb__before_clear_bit(); - clear_bit(BNAD_TXQ_FREE_SENT, &tcb->flags); - } - if (unlikely(!test_bit(BNAD_TXQ_TX_STARTED, - &tcb->flags))) - continue; - if (netif_queue_stopped(bnad->netdev)) { - if (acked && netif_carrier_ok(bnad->netdev) && - BNA_QE_FREE_CNT(tcb, tcb->q_depth) >= - BNAD_NETIF_WAKE_THRESHOLD) { - netif_wake_queue(bnad->netdev); - /* TODO */ - /* Counters for individual TxQs? */ - BNAD_UPDATE_CTR(bnad, - netif_queue_wakeup); - } - } - } - } -} - static u32 bnad_tx(struct bnad *bnad, struct bna_tcb *tcb) { @@ -1789,9 +1733,6 @@ bnad_cleanup_tx(struct bnad *bnad, u32 tx_id) bnad_tx_msix_unregister(bnad, tx_info, bnad->num_txq_per_tx); - if (0 == tx_id) - tasklet_kill(&bnad->tx_free_tasklet); - spin_lock_irqsave(&bnad->bna_lock, flags); bna_tx_destroy(tx_info->tx); spin_unlock_irqrestore(&bnad->bna_lock, flags); @@ -2871,9 +2812,6 @@ bnad_start_xmit(struct sk_buff *skb, struct net_device *netdev) bna_txq_prod_indx_doorbell(tcb); smp_mb(); - if ((u16) (*tcb->hw_consumer_index) != tcb->consumer_index) - tasklet_schedule(&bnad->tx_free_tasklet); - return NETDEV_TX_OK; } @@ -3155,9 +3093,8 @@ bnad_netdev_init(struct bnad *bnad, bool using_dac) /* * 1. Initialize the bnad structure * 2. Setup netdev pointer in pci_dev - * 3. Initialze Tx free tasklet - * 4. Initialize no. of TxQ & CQs & MSIX vectors - * 5. Initialize work queue. + * 3. Initialize no. of TxQ & CQs & MSIX vectors + * 4. Initialize work queue. */ static int bnad_init(struct bnad *bnad, @@ -3200,9 +3137,6 @@ bnad_init(struct bnad *bnad, bnad->tx_coalescing_timeo = BFI_TX_COALESCING_TIMEO; bnad->rx_coalescing_timeo = BFI_RX_COALESCING_TIMEO; - tasklet_init(&bnad->tx_free_tasklet, bnad_tx_free_tasklet, - (unsigned long)bnad); - sprintf(bnad->wq_name, "%s_wq_%d", BNAD_NAME, bnad->id); bnad->work_q = create_singlethread_workqueue(bnad->wq_name); @@ -3345,7 +3279,6 @@ bnad_pci_probe(struct pci_dev *pdev, /* * Initialize bnad structure * Setup relation between pci_dev & netdev - * Init Tx free tasklet */ err = bnad_init(bnad, pdev, netdev); if (err) diff --git a/drivers/net/ethernet/brocade/bna/bnad.h b/drivers/net/ethernet/brocade/bna/bnad.h index ff129aa7cb66..cf1d3bad01b6 100644 --- a/drivers/net/ethernet/brocade/bna/bnad.h +++ b/drivers/net/ethernet/brocade/bna/bnad.h @@ -320,7 +320,6 @@ struct bnad { /* Burnt in MAC address */ mac_t perm_addr; - struct tasklet_struct tx_free_tasklet; struct workqueue_struct *work_q; /* Statistics */ -- 2.30.2