bna: tx rx cleanup fix
This patch removes busy wait in tx/rx cleanup. bnad_cb_tx_cleanup() and bnad_cb_rx_cleanup() functions are called from irq context, and currently they do busy wait for the in-flight transmit or the currently executing napi polling routine to complete. To fix the issue, we create a workqueue to defer tx & rx cleanup processing, an in the tx rx cleanup handler, we will wait respective in flight processing to complete, before freeing the buffers. Signed-off-by: Jing Huang <huangj@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jing Huang
David S. Miller
parent
f96c1d24be
commit
01b54b1451
@ -80,8 +80,6 @@ do { \
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(sizeof(struct bnad_skb_unmap) * ((_depth) - 1)); \
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} while (0)
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#define BNAD_TXRX_SYNC_MDELAY 250 /* 250 msecs */
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static void
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bnad_add_to_list(struct bnad *bnad)
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{
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@ -141,7 +139,8 @@ bnad_pci_unmap_skb(struct device *pdev, struct bnad_skb_unmap *array,
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for (j = 0; j < frag; j++) {
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dma_unmap_page(pdev, dma_unmap_addr(&array[index], dma_addr),
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skb_frag_size(&skb_shinfo(skb)->frags[j]), DMA_TO_DEVICE);
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skb_frag_size(&skb_shinfo(skb)->frags[j]),
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DMA_TO_DEVICE);
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dma_unmap_addr_set(&array[index], dma_addr, 0);
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BNA_QE_INDX_ADD(index, 1, depth);
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}
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@ -453,12 +452,8 @@ bnad_poll_cq(struct bnad *bnad, struct bna_ccb *ccb, int budget)
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struct bna_pkt_rate *pkt_rt = &ccb->pkt_rate;
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struct bnad_rx_ctrl *rx_ctrl = (struct bnad_rx_ctrl *)(ccb->ctrl);
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set_bit(BNAD_FP_IN_RX_PATH, &rx_ctrl->flags);
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if (!test_bit(BNAD_RXQ_STARTED, &ccb->rcb[0]->flags)) {
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clear_bit(BNAD_FP_IN_RX_PATH, &rx_ctrl->flags);
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if (!test_bit(BNAD_RXQ_STARTED, &ccb->rcb[0]->flags))
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return 0;
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}
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prefetch(bnad->netdev);
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BNA_CQ_QPGE_PTR_GET(ccb->producer_index, ccb->sw_qpt, cmpl,
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@ -533,9 +528,8 @@ bnad_poll_cq(struct bnad *bnad, struct bna_ccb *ccb, int budget)
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if (skb->ip_summed == CHECKSUM_UNNECESSARY)
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napi_gro_receive(&rx_ctrl->napi, skb);
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else {
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else
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netif_receive_skb(skb);
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}
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next:
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cmpl->valid = 0;
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@ -839,20 +833,9 @@ bnad_cb_tcb_destroy(struct bnad *bnad, struct bna_tcb *tcb)
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{
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struct bnad_tx_info *tx_info =
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(struct bnad_tx_info *)tcb->txq->tx->priv;
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struct bnad_unmap_q *unmap_q = tcb->unmap_q;
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while (test_and_set_bit(BNAD_TXQ_FREE_SENT, &tcb->flags))
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cpu_relax();
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bnad_free_all_txbufs(bnad, tcb);
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unmap_q->producer_index = 0;
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unmap_q->consumer_index = 0;
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smp_mb__before_clear_bit();
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clear_bit(BNAD_TXQ_FREE_SENT, &tcb->flags);
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tx_info->tcb[tcb->id] = NULL;
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tcb->priv = NULL;
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}
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static void
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@ -865,12 +848,6 @@ bnad_cb_rcb_setup(struct bnad *bnad, struct bna_rcb *rcb)
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unmap_q->q_depth = BNAD_RX_UNMAPQ_DEPTH;
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}
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static void
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bnad_cb_rcb_destroy(struct bnad *bnad, struct bna_rcb *rcb)
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{
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bnad_free_all_rxbufs(bnad, rcb);
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}
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static void
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bnad_cb_ccb_setup(struct bnad *bnad, struct bna_ccb *ccb)
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{
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@ -916,7 +893,6 @@ bnad_cb_tx_resume(struct bnad *bnad, struct bna_tx *tx)
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{
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struct bnad_tx_info *tx_info = (struct bnad_tx_info *)tx->priv;
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struct bna_tcb *tcb;
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struct bnad_unmap_q *unmap_q;
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u32 txq_id;
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int i;
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@ -926,23 +902,9 @@ bnad_cb_tx_resume(struct bnad *bnad, struct bna_tx *tx)
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continue;
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txq_id = tcb->id;
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unmap_q = tcb->unmap_q;
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if (test_bit(BNAD_TXQ_TX_STARTED, &tcb->flags))
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continue;
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while (test_and_set_bit(BNAD_TXQ_FREE_SENT, &tcb->flags))
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cpu_relax();
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bnad_free_all_txbufs(bnad, tcb);
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unmap_q->producer_index = 0;
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unmap_q->consumer_index = 0;
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smp_mb__before_clear_bit();
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clear_bit(BNAD_TXQ_FREE_SENT, &tcb->flags);
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BUG_ON(test_bit(BNAD_TXQ_TX_STARTED, &tcb->flags));
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set_bit(BNAD_TXQ_TX_STARTED, &tcb->flags);
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BUG_ON(*(tcb->hw_consumer_index) != 0);
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if (netif_carrier_ok(bnad->netdev)) {
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printk(KERN_INFO "bna: %s %d TXQ_STARTED\n",
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@ -963,6 +925,54 @@ bnad_cb_tx_resume(struct bnad *bnad, struct bna_tx *tx)
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}
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}
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/*
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* Free all TxQs buffers and then notify TX_E_CLEANUP_DONE to Tx fsm.
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*/
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static void
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bnad_tx_cleanup(struct delayed_work *work)
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{
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struct bnad_tx_info *tx_info =
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container_of(work, struct bnad_tx_info, tx_cleanup_work);
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struct bnad *bnad = NULL;
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struct bnad_unmap_q *unmap_q;
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struct bna_tcb *tcb;
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unsigned long flags;
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uint32_t i, pending = 0;
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for (i = 0; i < BNAD_MAX_TXQ_PER_TX; i++) {
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tcb = tx_info->tcb[i];
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if (!tcb)
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continue;
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bnad = tcb->bnad;
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if (test_and_set_bit(BNAD_TXQ_FREE_SENT, &tcb->flags)) {
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pending++;
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continue;
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}
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bnad_free_all_txbufs(bnad, tcb);
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unmap_q = tcb->unmap_q;
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unmap_q->producer_index = 0;
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unmap_q->consumer_index = 0;
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smp_mb__before_clear_bit();
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clear_bit(BNAD_TXQ_FREE_SENT, &tcb->flags);
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}
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if (pending) {
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queue_delayed_work(bnad->work_q, &tx_info->tx_cleanup_work,
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msecs_to_jiffies(1));
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return;
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}
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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_tx_cleanup_complete(tx_info->tx);
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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}
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static void
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bnad_cb_tx_cleanup(struct bnad *bnad, struct bna_tx *tx)
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{
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@ -976,8 +986,7 @@ bnad_cb_tx_cleanup(struct bnad *bnad, struct bna_tx *tx)
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continue;
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}
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mdelay(BNAD_TXRX_SYNC_MDELAY);
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bna_tx_cleanup_complete(tx);
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queue_delayed_work(bnad->work_q, &tx_info->tx_cleanup_work, 0);
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}
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static void
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@ -1001,6 +1010,44 @@ bnad_cb_rx_stall(struct bnad *bnad, struct bna_rx *rx)
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}
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}
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/*
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* Free all RxQs buffers and then notify RX_E_CLEANUP_DONE to Rx fsm.
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*/
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static void
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bnad_rx_cleanup(void *work)
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{
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struct bnad_rx_info *rx_info =
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container_of(work, struct bnad_rx_info, rx_cleanup_work);
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struct bnad_rx_ctrl *rx_ctrl;
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struct bnad *bnad = NULL;
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unsigned long flags;
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uint32_t i;
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for (i = 0; i < BNAD_MAX_RXP_PER_RX; i++) {
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rx_ctrl = &rx_info->rx_ctrl[i];
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if (!rx_ctrl->ccb)
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continue;
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bnad = rx_ctrl->ccb->bnad;
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/*
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* Wait till the poll handler has exited
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* and nothing can be scheduled anymore
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*/
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napi_disable(&rx_ctrl->napi);
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bnad_cq_cmpl_init(bnad, rx_ctrl->ccb);
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bnad_free_all_rxbufs(bnad, rx_ctrl->ccb->rcb[0]);
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if (rx_ctrl->ccb->rcb[1])
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bnad_free_all_rxbufs(bnad, rx_ctrl->ccb->rcb[1]);
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}
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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_rx_cleanup_complete(rx_info->rx);
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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}
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static void
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bnad_cb_rx_cleanup(struct bnad *bnad, struct bna_rx *rx)
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{
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@ -1009,8 +1056,6 @@ bnad_cb_rx_cleanup(struct bnad *bnad, struct bna_rx *rx)
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struct bnad_rx_ctrl *rx_ctrl;
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int i;
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mdelay(BNAD_TXRX_SYNC_MDELAY);
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for (i = 0; i < BNAD_MAX_RXP_PER_RX; i++) {
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rx_ctrl = &rx_info->rx_ctrl[i];
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ccb = rx_ctrl->ccb;
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@ -1021,12 +1066,9 @@ bnad_cb_rx_cleanup(struct bnad *bnad, struct bna_rx *rx)
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if (ccb->rcb[1])
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clear_bit(BNAD_RXQ_STARTED, &ccb->rcb[1]->flags);
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while (test_bit(BNAD_FP_IN_RX_PATH, &rx_ctrl->flags))
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cpu_relax();
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}
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bna_rx_cleanup_complete(rx);
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queue_work(bnad->work_q, &rx_info->rx_cleanup_work);
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}
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static void
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@ -1046,13 +1088,12 @@ bnad_cb_rx_post(struct bnad *bnad, struct bna_rx *rx)
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if (!ccb)
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continue;
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bnad_cq_cmpl_init(bnad, ccb);
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napi_enable(&rx_ctrl->napi);
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for (j = 0; j < BNAD_MAX_RXQ_PER_RXP; j++) {
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rcb = ccb->rcb[j];
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if (!rcb)
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continue;
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bnad_free_all_rxbufs(bnad, rcb);
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set_bit(BNAD_RXQ_STARTED, &rcb->flags);
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set_bit(BNAD_RXQ_POST_OK, &rcb->flags);
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@ -1704,7 +1745,7 @@ poll_exit:
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#define BNAD_NAPI_POLL_QUOTA 64
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static void
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bnad_napi_init(struct bnad *bnad, u32 rx_id)
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bnad_napi_add(struct bnad *bnad, u32 rx_id)
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{
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struct bnad_rx_ctrl *rx_ctrl;
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int i;
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@ -1718,30 +1759,14 @@ bnad_napi_init(struct bnad *bnad, u32 rx_id)
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}
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static void
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bnad_napi_enable(struct bnad *bnad, u32 rx_id)
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{
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struct bnad_rx_ctrl *rx_ctrl;
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int i;
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/* Initialize & enable NAPI */
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for (i = 0; i < bnad->num_rxp_per_rx; i++) {
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rx_ctrl = &bnad->rx_info[rx_id].rx_ctrl[i];
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napi_enable(&rx_ctrl->napi);
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}
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}
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static void
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bnad_napi_disable(struct bnad *bnad, u32 rx_id)
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bnad_napi_delete(struct bnad *bnad, u32 rx_id)
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{
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int i;
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/* First disable and then clean up */
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for (i = 0; i < bnad->num_rxp_per_rx; i++) {
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napi_disable(&bnad->rx_info[rx_id].rx_ctrl[i].napi);
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for (i = 0; i < bnad->num_rxp_per_rx; i++)
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netif_napi_del(&bnad->rx_info[rx_id].rx_ctrl[i].napi);
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}
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}
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/* Should be held with conf_lock held */
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void
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@ -1832,6 +1857,9 @@ bnad_setup_tx(struct bnad *bnad, u32 tx_id)
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goto err_return;
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tx_info->tx = tx;
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INIT_DELAYED_WORK(&tx_info->tx_cleanup_work,
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(work_func_t)bnad_tx_cleanup);
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/* Register ISR for the Tx object */
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if (intr_info->intr_type == BNA_INTR_T_MSIX) {
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err = bnad_tx_msix_register(bnad, tx_info,
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@ -1928,7 +1956,7 @@ bnad_cleanup_rx(struct bnad *bnad, u32 rx_id)
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if (rx_info->rx_ctrl[0].ccb->intr_type == BNA_INTR_T_MSIX)
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bnad_rx_msix_unregister(bnad, rx_info, rx_config->num_paths);
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bnad_napi_disable(bnad, rx_id);
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bnad_napi_delete(bnad, rx_id);
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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_rx_destroy(rx_info->rx);
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@ -1952,7 +1980,7 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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struct bna_rx_config *rx_config = &bnad->rx_config[rx_id];
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static const struct bna_rx_event_cbfn rx_cbfn = {
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.rcb_setup_cbfn = bnad_cb_rcb_setup,
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.rcb_destroy_cbfn = bnad_cb_rcb_destroy,
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.rcb_destroy_cbfn = NULL,
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.ccb_setup_cbfn = bnad_cb_ccb_setup,
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.ccb_destroy_cbfn = bnad_cb_ccb_destroy,
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.rx_stall_cbfn = bnad_cb_rx_stall,
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@ -1998,11 +2026,14 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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rx_info->rx = rx;
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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INIT_WORK(&rx_info->rx_cleanup_work,
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(work_func_t)(bnad_rx_cleanup));
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/*
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* Init NAPI, so that state is set to NAPI_STATE_SCHED,
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* so that IRQ handler cannot schedule NAPI at this point.
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*/
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bnad_napi_init(bnad, rx_id);
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bnad_napi_add(bnad, rx_id);
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/* Register ISR for the Rx object */
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if (intr_info->intr_type == BNA_INTR_T_MSIX) {
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@ -2028,9 +2059,6 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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bna_rx_enable(rx);
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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/* Enable scheduling of NAPI */
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bnad_napi_enable(bnad, rx_id);
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return 0;
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err_return:
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@ -3129,6 +3157,7 @@ bnad_netdev_init(struct bnad *bnad, bool using_dac)
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* 2. Setup netdev pointer in pci_dev
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* 3. Initialze Tx free tasklet
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* 4. Initialize no. of TxQ & CQs & MSIX vectors
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* 5. Initialize work queue.
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*/
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static int
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bnad_init(struct bnad *bnad,
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@ -3174,6 +3203,12 @@ bnad_init(struct bnad *bnad,
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tasklet_init(&bnad->tx_free_tasklet, bnad_tx_free_tasklet,
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(unsigned long)bnad);
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sprintf(bnad->wq_name, "%s_wq_%d", BNAD_NAME, bnad->id);
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bnad->work_q = create_singlethread_workqueue(bnad->wq_name);
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if (!bnad->work_q)
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return -ENOMEM;
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return 0;
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}
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@ -3185,6 +3220,12 @@ bnad_init(struct bnad *bnad,
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static void
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bnad_uninit(struct bnad *bnad)
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{
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if (bnad->work_q) {
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flush_workqueue(bnad->work_q);
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destroy_workqueue(bnad->work_q);
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bnad->work_q = NULL;
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}
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if (bnad->bar0)
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iounmap(bnad->bar0);
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pci_set_drvdata(bnad->pcidev, NULL);
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@ -210,6 +210,7 @@ struct bnad_tx_info {
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struct bna_tx *tx; /* 1:1 between tx_info & tx */
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struct bna_tcb *tcb[BNAD_MAX_TXQ_PER_TX];
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u32 tx_id;
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struct delayed_work tx_cleanup_work;
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} ____cacheline_aligned;
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struct bnad_rx_info {
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@ -217,6 +218,7 @@ struct bnad_rx_info {
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struct bnad_rx_ctrl rx_ctrl[BNAD_MAX_RXP_PER_RX];
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u32 rx_id;
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struct work_struct rx_cleanup_work;
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} ____cacheline_aligned;
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/* Unmap queues for Tx / Rx cleanup */
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@ -319,6 +321,7 @@ struct bnad {
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mac_t perm_addr;
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struct tasklet_struct tx_free_tasklet;
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struct workqueue_struct *work_q;
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/* Statistics */
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struct bnad_stats stats;
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@ -328,6 +331,7 @@ struct bnad {
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||||
char adapter_name[BNAD_NAME_LEN];
|
||||
char port_name[BNAD_NAME_LEN];
|
||||
char mbox_irq_name[BNAD_NAME_LEN];
|
||||
char wq_name[BNAD_NAME_LEN];
|
||||
|
||||
/* debugfs specific data */
|
||||
char *regdata;
|
||||
|
||||
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