From bfe13f54f5028cff034e3b6247e9f433908f4f4f Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Tue, 9 Oct 2007 15:47:37 -0700 Subject: [PATCH] ibm_emac: Convert to use napi_struct independent of struct net_device Commit da3dedd9 ("[NET]: Make NAPI polling independent of struct net_device objects.") changed the interface to NAPI polling. Fix up the ibm_emac driver so that it works with this new interface. This is actually a nice cleanup because ibm_emac is one of the drivers that wants to have multiple NAPI structures for a single net_device. Tested with the internal MAC of a PowerPC 440SPe SoC with an AMCC 'Yucca' evaluation board. Signed-off-by: Roland Dreier Signed-off-by: Jeff Garzik --- drivers/net/ibm_emac/ibm_emac_mal.c | 48 ++++++++++------------------- drivers/net/ibm_emac/ibm_emac_mal.h | 2 +- include/linux/netdevice.h | 10 ++++++ 3 files changed, 28 insertions(+), 32 deletions(-) diff --git a/drivers/net/ibm_emac/ibm_emac_mal.c b/drivers/net/ibm_emac/ibm_emac_mal.c index cabd9846a5..4e49e8c4f8 100644 --- a/drivers/net/ibm_emac/ibm_emac_mal.c +++ b/drivers/net/ibm_emac/ibm_emac_mal.c @@ -207,10 +207,10 @@ static irqreturn_t mal_serr(int irq, void *dev_instance) static inline void mal_schedule_poll(struct ibm_ocp_mal *mal) { - if (likely(netif_rx_schedule_prep(&mal->poll_dev))) { + if (likely(napi_schedule_prep(&mal->napi))) { MAL_DBG2("%d: schedule_poll" NL, mal->def->index); mal_disable_eob_irq(mal); - __netif_rx_schedule(&mal->poll_dev); + __napi_schedule(&mal->napi); } else MAL_DBG2("%d: already in poll" NL, mal->def->index); } @@ -273,11 +273,11 @@ static irqreturn_t mal_rxde(int irq, void *dev_instance) return IRQ_HANDLED; } -static int mal_poll(struct net_device *ndev, int *budget) +static int mal_poll(struct napi_struct *napi, int budget) { - struct ibm_ocp_mal *mal = ndev->priv; + struct ibm_ocp_mal *mal = container_of(napi, struct ibm_ocp_mal, napi); struct list_head *l; - int rx_work_limit = min(ndev->quota, *budget), received = 0, done; + int received = 0; MAL_DBG2("%d: poll(%d) %d ->" NL, mal->def->index, *budget, rx_work_limit); @@ -295,38 +295,34 @@ static int mal_poll(struct net_device *ndev, int *budget) list_for_each(l, &mal->poll_list) { struct mal_commac *mc = list_entry(l, struct mal_commac, poll_list); - int n = mc->ops->poll_rx(mc->dev, rx_work_limit); + int n = mc->ops->poll_rx(mc->dev, budget); if (n) { received += n; - rx_work_limit -= n; - if (rx_work_limit <= 0) { - done = 0; + budget -= n; + if (budget <= 0) goto more_work; // XXX What if this is the last one ? - } } } /* We need to disable IRQs to protect from RXDE IRQ here */ local_irq_disable(); - __netif_rx_complete(ndev); + __napi_complete(napi); mal_enable_eob_irq(mal); local_irq_enable(); - done = 1; - /* Check for "rotting" packet(s) */ list_for_each(l, &mal->poll_list) { struct mal_commac *mc = list_entry(l, struct mal_commac, poll_list); if (unlikely(mc->ops->peek_rx(mc->dev) || mc->rx_stopped)) { MAL_DBG2("%d: rotting packet" NL, mal->def->index); - if (netif_rx_reschedule(ndev, received)) + if (napi_reschedule(napi)) mal_disable_eob_irq(mal); else MAL_DBG2("%d: already in poll list" NL, mal->def->index); - if (rx_work_limit > 0) + if (budget > 0) goto again; else goto more_work; @@ -335,12 +331,8 @@ static int mal_poll(struct net_device *ndev, int *budget) } more_work: - ndev->quota -= received; - *budget -= received; - - MAL_DBG2("%d: poll() %d <- %d" NL, mal->def->index, *budget, - done ? 0 : 1); - return done ? 0 : 1; + MAL_DBG2("%d: poll() %d <- %d" NL, mal->def->index, budget, received); + return received; } static void mal_reset(struct ibm_ocp_mal *mal) @@ -425,11 +417,8 @@ static int __init mal_probe(struct ocp_device *ocpdev) mal->def = ocpdev->def; INIT_LIST_HEAD(&mal->poll_list); - set_bit(__LINK_STATE_START, &mal->poll_dev.state); - mal->poll_dev.weight = CONFIG_IBM_EMAC_POLL_WEIGHT; - mal->poll_dev.poll = mal_poll; - mal->poll_dev.priv = mal; - atomic_set(&mal->poll_dev.refcnt, 1); + mal->napi.weight = CONFIG_IBM_EMAC_POLL_WEIGHT; + mal->napi.poll = mal_poll; INIT_LIST_HEAD(&mal->list); @@ -520,11 +509,8 @@ static void __exit mal_remove(struct ocp_device *ocpdev) MAL_DBG("%d: remove" NL, mal->def->index); - /* Syncronize with scheduled polling, - stolen from net/core/dev.c:dev_close() - */ - clear_bit(__LINK_STATE_START, &mal->poll_dev.state); - netif_poll_disable(&mal->poll_dev); + /* Synchronize with scheduled polling */ + napi_disable(&mal->napi); if (!list_empty(&mal->list)) { /* This is *very* bad */ diff --git a/drivers/net/ibm_emac/ibm_emac_mal.h b/drivers/net/ibm_emac/ibm_emac_mal.h index 64bc338acc..8f54d62199 100644 --- a/drivers/net/ibm_emac/ibm_emac_mal.h +++ b/drivers/net/ibm_emac/ibm_emac_mal.h @@ -195,7 +195,7 @@ struct ibm_ocp_mal { dcr_host_t dcrhost; struct list_head poll_list; - struct net_device poll_dev; + struct napi_struct napi; struct list_head list; u32 tx_chan_mask; diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 91cd3f3db5..4848c7afa4 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -349,6 +349,16 @@ static inline void napi_schedule(struct napi_struct *n) __napi_schedule(n); } +/* Try to reschedule poll. Called by dev->poll() after napi_complete(). */ +static inline int napi_reschedule(struct napi_struct *napi) +{ + if (napi_schedule_prep(napi)) { + __napi_schedule(napi); + return 1; + } + return 0; +} + /** * napi_complete - NAPI processing complete * @n: napi context -- 2.39.5