From fb6113e688e0bf5bc3081d6ff02e8ad77fed3c7a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 2 Feb 2017 10:16:00 -0800 Subject: [PATCH] be2net: get rid of custom busy poll code Compared to custom busy_poll, the generic NAPI one is better, since it allows to use GRO, and it removes a lot of code and extra locked operations in fast path. Signed-off-by: Eric Dumazet Cc: Sathya Perla Cc: Ajit Khaparde Cc: Sriharsha Basavapatna Signed-off-by: David S. Miller --- drivers/net/ethernet/emulex/benet/be.h | 5 - drivers/net/ethernet/emulex/benet/be_main.c | 151 ++------------------ 2 files changed, 9 insertions(+), 147 deletions(-) diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h index 4c30c44b242e..d49528ad7821 100644 --- a/drivers/net/ethernet/emulex/benet/be.h +++ b/drivers/net/ethernet/emulex/benet/be.h @@ -226,11 +226,6 @@ struct be_aic_obj { /* Adaptive interrupt coalescing (AIC) info */ u64 tx_reqs_prev; /* Used to calculate TX pps */ }; -enum { - NAPI_POLLING, - BUSY_POLLING -}; - struct be_mcc_obj { struct be_queue_info q; struct be_queue_info cq; diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c index 52aed6d383c3..6be3b9aba8ed 100644 --- a/drivers/net/ethernet/emulex/benet/be_main.c +++ b/drivers/net/ethernet/emulex/benet/be_main.c @@ -3063,7 +3063,7 @@ static inline bool do_gro(struct be_rx_compl_info *rxcp) } static int be_process_rx(struct be_rx_obj *rxo, struct napi_struct *napi, - int budget, int polling) + int budget) { struct be_adapter *adapter = rxo->adapter; struct be_queue_info *rx_cq = &rxo->cq; @@ -3095,8 +3095,7 @@ static int be_process_rx(struct be_rx_obj *rxo, struct napi_struct *napi, goto loop_continue; } - /* Don't do gro when we're busy_polling */ - if (do_gro(rxcp) && polling != BUSY_POLLING) + if (do_gro(rxcp)) be_rx_compl_process_gro(rxo, napi, rxcp); else be_rx_compl_process(rxo, napi, rxcp); @@ -3194,106 +3193,6 @@ static void be_process_tx(struct be_adapter *adapter, struct be_tx_obj *txo, } } -#ifdef CONFIG_NET_RX_BUSY_POLL -static inline bool be_lock_napi(struct be_eq_obj *eqo) -{ - bool status = true; - - spin_lock(&eqo->lock); /* BH is already disabled */ - if (eqo->state & BE_EQ_LOCKED) { - WARN_ON(eqo->state & BE_EQ_NAPI); - eqo->state |= BE_EQ_NAPI_YIELD; - status = false; - } else { - eqo->state = BE_EQ_NAPI; - } - spin_unlock(&eqo->lock); - return status; -} - -static inline void be_unlock_napi(struct be_eq_obj *eqo) -{ - spin_lock(&eqo->lock); /* BH is already disabled */ - - WARN_ON(eqo->state & (BE_EQ_POLL | BE_EQ_NAPI_YIELD)); - eqo->state = BE_EQ_IDLE; - - spin_unlock(&eqo->lock); -} - -static inline bool be_lock_busy_poll(struct be_eq_obj *eqo) -{ - bool status = true; - - spin_lock_bh(&eqo->lock); - if (eqo->state & BE_EQ_LOCKED) { - eqo->state |= BE_EQ_POLL_YIELD; - status = false; - } else { - eqo->state |= BE_EQ_POLL; - } - spin_unlock_bh(&eqo->lock); - return status; -} - -static inline void be_unlock_busy_poll(struct be_eq_obj *eqo) -{ - spin_lock_bh(&eqo->lock); - - WARN_ON(eqo->state & (BE_EQ_NAPI)); - eqo->state = BE_EQ_IDLE; - - spin_unlock_bh(&eqo->lock); -} - -static inline void be_enable_busy_poll(struct be_eq_obj *eqo) -{ - spin_lock_init(&eqo->lock); - eqo->state = BE_EQ_IDLE; -} - -static inline void be_disable_busy_poll(struct be_eq_obj *eqo) -{ - local_bh_disable(); - - /* It's enough to just acquire napi lock on the eqo to stop - * be_busy_poll() from processing any queueus. - */ - while (!be_lock_napi(eqo)) - mdelay(1); - - local_bh_enable(); -} - -#else /* CONFIG_NET_RX_BUSY_POLL */ - -static inline bool be_lock_napi(struct be_eq_obj *eqo) -{ - return true; -} - -static inline void be_unlock_napi(struct be_eq_obj *eqo) -{ -} - -static inline bool be_lock_busy_poll(struct be_eq_obj *eqo) -{ - return false; -} - -static inline void be_unlock_busy_poll(struct be_eq_obj *eqo) -{ -} - -static inline void be_enable_busy_poll(struct be_eq_obj *eqo) -{ -} - -static inline void be_disable_busy_poll(struct be_eq_obj *eqo) -{ -} -#endif /* CONFIG_NET_RX_BUSY_POLL */ - int be_poll(struct napi_struct *napi, int budget) { struct be_eq_obj *eqo = container_of(napi, struct be_eq_obj, napi); @@ -3308,18 +3207,13 @@ int be_poll(struct napi_struct *napi, int budget) for_all_tx_queues_on_eq(adapter, eqo, txo, i) be_process_tx(adapter, txo, i); - if (be_lock_napi(eqo)) { - /* This loop will iterate twice for EQ0 in which - * completions of the last RXQ (default one) are also processed - * For other EQs the loop iterates only once - */ - for_all_rx_queues_on_eq(adapter, eqo, rxo, i) { - work = be_process_rx(rxo, napi, budget, NAPI_POLLING); - max_work = max(work, max_work); - } - be_unlock_napi(eqo); - } else { - max_work = budget; + /* This loop will iterate twice for EQ0 in which + * completions of the last RXQ (default one) are also processed + * For other EQs the loop iterates only once + */ + for_all_rx_queues_on_eq(adapter, eqo, rxo, i) { + work = be_process_rx(rxo, napi, budget); + max_work = max(work, max_work); } if (is_mcc_eqo(eqo)) @@ -3343,28 +3237,6 @@ int be_poll(struct napi_struct *napi, int budget) return max_work; } -#ifdef CONFIG_NET_RX_BUSY_POLL -static int be_busy_poll(struct napi_struct *napi) -{ - struct be_eq_obj *eqo = container_of(napi, struct be_eq_obj, napi); - struct be_adapter *adapter = eqo->adapter; - struct be_rx_obj *rxo; - int i, work = 0; - - if (!be_lock_busy_poll(eqo)) - return LL_FLUSH_BUSY; - - for_all_rx_queues_on_eq(adapter, eqo, rxo, i) { - work = be_process_rx(rxo, napi, 4, BUSY_POLLING); - if (work) - break; - } - - be_unlock_busy_poll(eqo); - return work; -} -#endif - void be_detect_error(struct be_adapter *adapter) { u32 ue_lo = 0, ue_hi = 0, ue_lo_mask = 0, ue_hi_mask = 0; @@ -3669,7 +3541,6 @@ static int be_close(struct net_device *netdev) if (adapter->flags & BE_FLAGS_NAPI_ENABLED) { for_all_evt_queues(adapter, eqo, i) { napi_disable(&eqo->napi); - be_disable_busy_poll(eqo); } adapter->flags &= ~BE_FLAGS_NAPI_ENABLED; } @@ -3839,7 +3710,6 @@ static int be_open(struct net_device *netdev) for_all_evt_queues(adapter, eqo, i) { napi_enable(&eqo->napi); - be_enable_busy_poll(eqo); be_eq_notify(adapter, eqo->q.id, true, true, 0, 0); } adapter->flags |= BE_FLAGS_NAPI_ENABLED; @@ -5245,9 +5115,6 @@ static const struct net_device_ops be_netdev_ops = { #endif .ndo_bridge_setlink = be_ndo_bridge_setlink, .ndo_bridge_getlink = be_ndo_bridge_getlink, -#ifdef CONFIG_NET_RX_BUSY_POLL - .ndo_busy_poll = be_busy_poll, -#endif .ndo_udp_tunnel_add = be_add_vxlan_port, .ndo_udp_tunnel_del = be_del_vxlan_port, .ndo_features_check = be_features_check, -- 2.39.5