From 5bcf6ac036556fcb4f9b5637f61e1227b66416cc Mon Sep 17 00:00:00 2001 From: Rasesh Mody Date: Tue, 27 Sep 2011 10:39:10 +0000 Subject: bna: Add Callback to Fix RXQ Stop Change details: - Add a callback in the BNA, which is called before sending FW command to stop RxQs. After this callback is called, driver should not post anymore Rx buffers to the RxQ. This addresses a small window where driver posts Rx buffers while FW is stopping/has stopped the RxQ. - Registering callback function, rx_stall_cbfn, during bna_rx_create. Invoking callback function, rx_stall_cbfn, before sending rx_cfg_clr command to FW - Bnad_cb_rx_stall implementation - set a flag in the Rxq to mark buffer posting disabled state. While posting buffers check for the above flag. Signed-off-by: Gurunatha Karaje Signed-off-by: Rasesh Mody Signed-off-by: David S. Miller --- drivers/net/ethernet/brocade/bna/bna_tx_rx.c | 11 +++++++++++ drivers/net/ethernet/brocade/bna/bna_types.h | 2 ++ drivers/net/ethernet/brocade/bna/bnad.c | 25 ++++++++++++++++++++++++- drivers/net/ethernet/brocade/bna/bnad.h | 1 + 4 files changed, 38 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/brocade/bna/bna_tx_rx.c b/drivers/net/ethernet/brocade/bna/bna_tx_rx.c index 066704efe34..276fcb589f4 100644 --- a/drivers/net/ethernet/brocade/bna/bna_tx_rx.c +++ b/drivers/net/ethernet/brocade/bna/bna_tx_rx.c @@ -1335,6 +1335,12 @@ do { \ } \ } while (0) +#define call_rx_stall_cbfn(rx) \ +do { \ + if ((rx)->rx_stall_cbfn) \ + (rx)->rx_stall_cbfn((rx)->bna->bnad, (rx)); \ +} while (0) + #define bfi_enet_datapath_q_init(bfi_q, bna_qpt) \ do { \ struct bna_dma_addr cur_q_addr = \ @@ -1467,6 +1473,7 @@ bna_rx_sm_rxf_stop_wait(struct bna_rx *rx, enum bna_rx_event event) case RX_E_FAIL: bfa_fsm_set_state(rx, bna_rx_sm_cleanup_wait); bna_rxf_fail(&rx->rxf); + call_rx_stall_cbfn(rx); rx->rx_cleanup_cbfn(rx->bna->bnad, rx); break; @@ -1476,6 +1483,7 @@ bna_rx_sm_rxf_stop_wait(struct bna_rx *rx, enum bna_rx_event event) case RX_E_RXF_STOPPED: bfa_fsm_set_state(rx, bna_rx_sm_stop_wait); + call_rx_stall_cbfn(rx); bna_rx_enet_stop(rx); break; @@ -1516,6 +1524,7 @@ bna_rx_sm_started(struct bna_rx *rx, enum bna_rx_event event) bfa_fsm_set_state(rx, bna_rx_sm_failed); bna_ethport_cb_rx_stopped(&rx->bna->ethport); bna_rxf_fail(&rx->rxf); + call_rx_stall_cbfn(rx); rx->rx_cleanup_cbfn(rx->bna->bnad, rx); break; @@ -1536,6 +1545,7 @@ static void bna_rx_sm_rxf_start_wait(struct bna_rx *rx, case RX_E_FAIL: bfa_fsm_set_state(rx, bna_rx_sm_failed); bna_rxf_fail(&rx->rxf); + call_rx_stall_cbfn(rx); rx->rx_cleanup_cbfn(rx->bna->bnad, rx); break; @@ -2369,6 +2379,7 @@ bna_rx_create(struct bna *bna, struct bnad *bnad, rx->rcb_destroy_cbfn = rx_cbfn->rcb_destroy_cbfn; rx->ccb_setup_cbfn = rx_cbfn->ccb_setup_cbfn; rx->ccb_destroy_cbfn = rx_cbfn->ccb_destroy_cbfn; + rx->rx_stall_cbfn = rx_cbfn->rx_stall_cbfn; /* Following callbacks are mandatory */ rx->rx_cleanup_cbfn = rx_cbfn->rx_cleanup_cbfn; rx->rx_post_cbfn = rx_cbfn->rx_post_cbfn; diff --git a/drivers/net/ethernet/brocade/bna/bna_types.h b/drivers/net/ethernet/brocade/bna/bna_types.h index 242d7997ffb..d090fbfb12f 100644 --- a/drivers/net/ethernet/brocade/bna/bna_types.h +++ b/drivers/net/ethernet/brocade/bna/bna_types.h @@ -847,6 +847,7 @@ struct bna_rx { void (*rcb_destroy_cbfn)(struct bnad *, struct bna_rcb *); void (*ccb_setup_cbfn)(struct bnad *, struct bna_ccb *); void (*ccb_destroy_cbfn)(struct bnad *, struct bna_ccb *); + void (*rx_stall_cbfn)(struct bnad *, struct bna_rx *); void (*rx_cleanup_cbfn)(struct bnad *, struct bna_rx *); void (*rx_post_cbfn)(struct bnad *, struct bna_rx *); @@ -864,6 +865,7 @@ struct bna_rx_event_cbfn { void (*rcb_destroy_cbfn)(struct bnad *, struct bna_rcb *); void (*ccb_setup_cbfn)(struct bnad *, struct bna_ccb *); void (*ccb_destroy_cbfn)(struct bnad *, struct bna_ccb *); + void (*rx_stall_cbfn)(struct bnad *, struct bna_rx *); /* Mandatory */ void (*rx_cleanup_cbfn)(struct bnad *, struct bna_rx *); void (*rx_post_cbfn)(struct bnad *, struct bna_rx *); diff --git a/drivers/net/ethernet/brocade/bna/bnad.c b/drivers/net/ethernet/brocade/bna/bnad.c index d76d7cb0dd0..2f4ced66612 100644 --- a/drivers/net/ethernet/brocade/bna/bnad.c +++ b/drivers/net/ethernet/brocade/bna/bnad.c @@ -396,7 +396,7 @@ finishing: unmap_q->producer_index = unmap_prod; rcb->producer_index = unmap_prod; smp_mb(); - if (likely(test_bit(BNAD_RXQ_STARTED, &rcb->flags))) + if (likely(test_bit(BNAD_RXQ_POST_OK, &rcb->flags))) bna_rxq_prod_indx_doorbell(rcb); } } @@ -955,6 +955,27 @@ bnad_cb_tx_cleanup(struct bnad *bnad, struct bna_tx *tx) bna_tx_cleanup_complete(tx); } +static void +bnad_cb_rx_stall(struct bnad *bnad, struct bna_rx *rx) +{ + struct bnad_rx_info *rx_info = (struct bnad_rx_info *)rx->priv; + struct bna_ccb *ccb; + struct bnad_rx_ctrl *rx_ctrl; + int i; + + for (i = 0; i < BNAD_MAX_RXP_PER_RX; i++) { + rx_ctrl = &rx_info->rx_ctrl[i]; + ccb = rx_ctrl->ccb; + if (!ccb) + continue; + + clear_bit(BNAD_RXQ_POST_OK, &ccb->rcb[0]->flags); + + if (ccb->rcb[1]) + clear_bit(BNAD_RXQ_POST_OK, &ccb->rcb[1]->flags); + } +} + static void bnad_cb_rx_cleanup(struct bnad *bnad, struct bna_rx *rx) { @@ -1009,6 +1030,7 @@ bnad_cb_rx_post(struct bnad *bnad, struct bna_rx *rx) bnad_free_all_rxbufs(bnad, rcb); set_bit(BNAD_RXQ_STARTED, &rcb->flags); + set_bit(BNAD_RXQ_POST_OK, &rcb->flags); unmap_q = rcb->unmap_q; /* Now allocate & post buffers for this RCB */ @@ -1898,6 +1920,7 @@ bnad_setup_rx(struct bnad *bnad, u32 rx_id) .rcb_destroy_cbfn = bnad_cb_rcb_destroy, .ccb_setup_cbfn = bnad_cb_ccb_setup, .ccb_destroy_cbfn = bnad_cb_ccb_destroy, + .rx_stall_cbfn = bnad_cb_rx_stall, .rx_cleanup_cbfn = bnad_cb_rx_cleanup, .rx_post_cbfn = bnad_cb_rx_post, }; diff --git a/drivers/net/ethernet/brocade/bna/bnad.h b/drivers/net/ethernet/brocade/bna/bnad.h index 1c9328d564d..50fb36aedd5 100644 --- a/drivers/net/ethernet/brocade/bna/bnad.h +++ b/drivers/net/ethernet/brocade/bna/bnad.h @@ -103,6 +103,7 @@ struct bnad_rx_ctrl { /* Bit positions for rcb->flags */ #define BNAD_RXQ_REFILL 0 #define BNAD_RXQ_STARTED 1 +#define BNAD_RXQ_POST_OK 2 /* Resource limits */ #define BNAD_NUM_TXQ (bnad->num_tx * bnad->num_txq_per_tx) -- cgit v1.2.3-70-g09d2