mirror of https://gitee.com/openkylin/linux.git
bna: Interrupt Polling and NAPI Init Changes
Change details:
- Remove unnecessary ccb check from bnad_poll_cq
- Add bnad pointer to rx_ctrl structure, so that bnad can be accessed directly
from rx_ctrl in the NAPI poll routines, even if ccb is NULL
- Validate ccb before referencing to it in bnad_msix_rx and bnad_napi_poll_rx
- Fix the order of NAPI init / uninit in Tx / Rx setup / teardown path:
a. Kill bnad tx free tasklet ahead of call to bna_tx_destroy()
b. Call NAPI disable only after call to Rx free_irq(). This makes sure Rx
interrupt does not schedule a poll when NAPI is already disabled
- NAPI poll runs before the h/w has completed configuration. This causes a
crash. Delay enabling NAPI till after bna_rx_enable(). Split NAPI
initialization into 2 steps, bnad_napi_init() & bnad_napi_enable().
Signed-off-by: Gurunatha Karaje <gkaraje@brocade.com>
Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rasesh Mody
David S. Miller
parent
0caa9aaec5
commit
2be6714422
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@ -535,16 +535,11 @@ bnad_poll_cq(struct bnad *bnad, struct bna_ccb *ccb, int budget)
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BNA_QE_INDX_ADD(ccb->producer_index, wis, ccb->q_depth);
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if (likely(ccb)) {
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if (likely(test_bit(BNAD_RXQ_STARTED, &ccb->rcb[0]->flags)))
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bna_ib_ack(ccb->i_dbell, packets);
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bnad_refill_rxq(bnad, ccb->rcb[0]);
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if (ccb->rcb[1])
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bnad_refill_rxq(bnad, ccb->rcb[1]);
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} else {
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if (likely(test_bit(BNAD_RXQ_STARTED, &ccb->rcb[0]->flags)))
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bna_ib_ack(ccb->i_dbell, 0);
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}
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clear_bit(BNAD_FP_IN_RX_PATH, &rx_ctrl->flags);
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@ -590,9 +585,9 @@ static irqreturn_t
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bnad_msix_rx(int irq, void *data)
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{
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struct bna_ccb *ccb = (struct bna_ccb *)data;
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struct bnad *bnad = ccb->bnad;
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bnad_netif_rx_schedule_poll(bnad, ccb);
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if (ccb)
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bnad_netif_rx_schedule_poll(ccb->bnad, ccb);
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return IRQ_HANDLED;
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}
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@ -1658,18 +1653,14 @@ bnad_napi_poll_rx(struct napi_struct *napi, int budget)
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{
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struct bnad_rx_ctrl *rx_ctrl =
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container_of(napi, struct bnad_rx_ctrl, napi);
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struct bna_ccb *ccb;
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struct bnad *bnad;
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struct bnad *bnad = rx_ctrl->bnad;
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int rcvd = 0;
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ccb = rx_ctrl->ccb;
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bnad = ccb->bnad;
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if (!netif_carrier_ok(bnad->netdev))
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goto poll_exit;
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rcvd = bnad_poll_cq(bnad, ccb, budget);
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rcvd = bnad_poll_cq(bnad, rx_ctrl->ccb, budget);
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if (rcvd == budget)
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return rcvd;
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@ -1678,10 +1669,27 @@ bnad_napi_poll_rx(struct napi_struct *napi, int budget)
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BNAD_UPDATE_CTR(bnad, netif_rx_complete);
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bnad_enable_rx_irq(bnad, ccb);
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if (rx_ctrl->ccb)
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bnad_enable_rx_irq(bnad, rx_ctrl->ccb);
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return rcvd;
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}
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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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{
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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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netif_napi_add(bnad->netdev, &rx_ctrl->napi,
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bnad_napi_poll_rx, BNAD_NAPI_POLL_QUOTA);
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}
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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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@ -1692,9 +1700,6 @@ bnad_napi_enable(struct bnad *bnad, u32 rx_id)
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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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netif_napi_add(bnad->netdev, &rx_ctrl->napi,
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bnad_napi_poll_rx, 64);
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napi_enable(&rx_ctrl->napi);
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}
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}
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@ -1732,6 +1737,9 @@ bnad_cleanup_tx(struct bnad *bnad, u32 tx_id)
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bnad_tx_msix_unregister(bnad, tx_info,
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bnad->num_txq_per_tx);
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if (0 == tx_id)
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tasklet_kill(&bnad->tx_free_tasklet);
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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_tx_destroy(tx_info->tx);
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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@ -1739,9 +1747,6 @@ bnad_cleanup_tx(struct bnad *bnad, u32 tx_id)
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tx_info->tx = NULL;
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tx_info->tx_id = 0;
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if (0 == tx_id)
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tasklet_kill(&bnad->tx_free_tasklet);
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bnad_tx_res_free(bnad, res_info);
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}
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@ -1852,6 +1857,16 @@ bnad_init_rx_config(struct bnad *bnad, struct bna_rx_config *rx_config)
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rx_config->vlan_strip_status = BNA_STATUS_T_ENABLED;
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}
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static void
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bnad_rx_ctrl_init(struct bnad *bnad, u32 rx_id)
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{
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struct bnad_rx_info *rx_info = &bnad->rx_info[rx_id];
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int i;
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for (i = 0; i < bnad->num_rxp_per_rx; i++)
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rx_info->rx_ctrl[i].bnad = bnad;
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}
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/* Called with mutex_lock(&bnad->conf_mutex) held */
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void
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bnad_cleanup_rx(struct bnad *bnad, u32 rx_id)
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@ -1875,8 +1890,6 @@ bnad_cleanup_rx(struct bnad *bnad, u32 rx_id)
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del_timer_sync(&bnad->dim_timer);
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}
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bnad_napi_disable(bnad, rx_id);
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init_completion(&bnad->bnad_completions.rx_comp);
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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_rx_disable(rx_info->rx, BNA_HARD_CLEANUP, bnad_cb_rx_disabled);
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@ -1886,6 +1899,8 @@ 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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spin_lock_irqsave(&bnad->bna_lock, flags);
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bna_rx_destroy(rx_info->rx);
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spin_unlock_irqrestore(&bnad->bna_lock, flags);
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@ -1939,6 +1954,8 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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if (err)
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return err;
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bnad_rx_ctrl_init(bnad, rx_id);
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/* Ask BNA to create one Rx object, supplying required resources */
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spin_lock_irqsave(&bnad->bna_lock, flags);
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rx = bna_rx_create(&bnad->bna, bnad, rx_config, &rx_cbfn, res_info,
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@ -1948,6 +1965,12 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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goto err_return;
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rx_info->rx = rx;
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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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/* Register ISR for the Rx object */
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if (intr_info->intr_type == BNA_INTR_T_MSIX) {
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err = bnad_rx_msix_register(bnad, rx_info, rx_id,
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@ -1956,9 +1979,6 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id)
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goto err_return;
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}
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/* Enable NAPI */
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bnad_napi_enable(bnad, rx_id);
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spin_lock_irqsave(&bnad->bna_lock, flags);
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if (0 == rx_id) {
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/* Set up Dynamic Interrupt Moderation Vector */
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@ -1975,6 +1995,9 @@ 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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@ -53,6 +53,7 @@
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*/
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struct bnad_rx_ctrl {
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struct bna_ccb *ccb;
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struct bnad *bnad;
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unsigned long flags;
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struct napi_struct napi;
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};
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