diff options
Diffstat (limited to 'drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c')
| -rw-r--r-- | drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c | 929 |
1 files changed, 929 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c new file mode 100644 index 000000000000..027d7a75be39 --- /dev/null +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c @@ -0,0 +1,929 @@ +/******************************************************************************* + + Intel 10 Gigabit PCI Express Linux driver + Copyright(c) 1999 - 2012 Intel Corporation. + + This program is free software; you can redistribute it and/or modify it + under the terms and conditions of the GNU General Public License, + version 2, as published by the Free Software Foundation. + + This program is distributed in the hope it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. + + You should have received a copy of the GNU General Public License along with + this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + + The full GNU General Public License is included in this distribution in + the file called "COPYING". + + Contact Information: + e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> + Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + +*******************************************************************************/ + +#include "ixgbe.h" +#include "ixgbe_sriov.h" + +/** + * ixgbe_cache_ring_rss - Descriptor ring to register mapping for RSS + * @adapter: board private structure to initialize + * + * Cache the descriptor ring offsets for RSS to the assigned rings. + * + **/ +static inline bool ixgbe_cache_ring_rss(struct ixgbe_adapter *adapter) +{ + int i; + + if (!(adapter->flags & IXGBE_FLAG_RSS_ENABLED)) + return false; + + for (i = 0; i < adapter->num_rx_queues; i++) + adapter->rx_ring[i]->reg_idx = i; + for (i = 0; i < adapter->num_tx_queues; i++) + adapter->tx_ring[i]->reg_idx = i; + + return true; +} +#ifdef CONFIG_IXGBE_DCB + +/* ixgbe_get_first_reg_idx - Return first register index associated with ring */ +static void ixgbe_get_first_reg_idx(struct ixgbe_adapter *adapter, u8 tc, + unsigned int *tx, unsigned int *rx) +{ + struct net_device *dev = adapter->netdev; + struct ixgbe_hw *hw = &adapter->hw; + u8 num_tcs = netdev_get_num_tc(dev); + + *tx = 0; + *rx = 0; + + switch (hw->mac.type) { + case ixgbe_mac_82598EB: + *tx = tc << 2; + *rx = tc << 3; + break; + case ixgbe_mac_82599EB: + case ixgbe_mac_X540: + if (num_tcs > 4) { + if (tc < 3) { + *tx = tc << 5; + *rx = tc << 4; + } else if (tc < 5) { + *tx = ((tc + 2) << 4); + *rx = tc << 4; + } else if (tc < num_tcs) { + *tx = ((tc + 8) << 3); + *rx = tc << 4; + } + } else { + *rx = tc << 5; + switch (tc) { + case 0: + *tx = 0; + break; + case 1: + *tx = 64; + break; + case 2: + *tx = 96; + break; + case 3: + *tx = 112; + break; + default: + break; + } + } + break; + default: + break; + } +} + +/** + * ixgbe_cache_ring_dcb - Descriptor ring to register mapping for DCB + * @adapter: board private structure to initialize + * + * Cache the descriptor ring offsets for DCB to the assigned rings. + * + **/ +static inline bool ixgbe_cache_ring_dcb(struct ixgbe_adapter *adapter) +{ + struct net_device *dev = adapter->netdev; + int i, j, k; + u8 num_tcs = netdev_get_num_tc(dev); + + if (!num_tcs) + return false; + + for (i = 0, k = 0; i < num_tcs; i++) { + unsigned int tx_s, rx_s; + u16 count = dev->tc_to_txq[i].count; + + ixgbe_get_first_reg_idx(adapter, i, &tx_s, &rx_s); + for (j = 0; j < count; j++, k++) { + adapter->tx_ring[k]->reg_idx = tx_s + j; + adapter->rx_ring[k]->reg_idx = rx_s + j; + adapter->tx_ring[k]->dcb_tc = i; + adapter->rx_ring[k]->dcb_tc = i; + } + } + + return true; +} +#endif + +/** + * ixgbe_cache_ring_fdir - Descriptor ring to register mapping for Flow Director + * @adapter: board private structure to initialize + * + * Cache the descriptor ring offsets for Flow Director to the assigned rings. + * + **/ +static inline bool ixgbe_cache_ring_fdir(struct ixgbe_adapter *adapter) +{ + int i; + bool ret = false; + + if ((adapter->flags & IXGBE_FLAG_RSS_ENABLED) && + (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE)) { + for (i = 0; i < adapter->num_rx_queues; i++) + adapter->rx_ring[i]->reg_idx = i; + for (i = 0; i < adapter->num_tx_queues; i++) + adapter->tx_ring[i]->reg_idx = i; + ret = true; + } + + return ret; +} + +#ifdef IXGBE_FCOE +/** + * ixgbe_cache_ring_fcoe - Descriptor ring to register mapping for the FCoE + * @adapter: board private structure to initialize + * + * Cache the descriptor ring offsets for FCoE mode to the assigned rings. + * + */ +static inline bool ixgbe_cache_ring_fcoe(struct ixgbe_adapter *adapter) +{ + struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE]; + int i; + u8 fcoe_rx_i = 0, fcoe_tx_i = 0; + + if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED)) + return false; + + if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) { + if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) + ixgbe_cache_ring_fdir(adapter); + else + ixgbe_cache_ring_rss(adapter); + + fcoe_rx_i = f->mask; + fcoe_tx_i = f->mask; + } + for (i = 0; i < f->indices; i++, fcoe_rx_i++, fcoe_tx_i++) { + adapter->rx_ring[f->mask + i]->reg_idx = fcoe_rx_i; + adapter->tx_ring[f->mask + i]->reg_idx = fcoe_tx_i; + } + return true; +} + +#endif /* IXGBE_FCOE */ +/** + * ixgbe_cache_ring_sriov - Descriptor ring to register mapping for sriov + * @adapter: board private structure to initialize + * + * SR-IOV doesn't use any descriptor rings but changes the default if + * no other mapping is used. + * + */ +static inline bool ixgbe_cache_ring_sriov(struct ixgbe_adapter *adapter) +{ + adapter->rx_ring[0]->reg_idx = adapter->num_vfs * 2; + adapter->tx_ring[0]->reg_idx = adapter->num_vfs * 2; + if (adapter->num_vfs) + return true; + else + return false; +} + +/** + * ixgbe_cache_ring_register - Descriptor ring to register mapping + * @adapter: board private structure to initialize + * + * Once we know the feature-set enabled for the device, we'll cache + * the register offset the descriptor ring is assigned to. + * + * Note, the order the various feature calls is important. It must start with + * the "most" features enabled at the same time, then trickle down to the + * least amount of features turned on at once. + **/ +static void ixgbe_cache_ring_register(struct ixgbe_adapter *adapter) +{ + /* start with default case */ + adapter->rx_ring[0]->reg_idx = 0; + adapter->tx_ring[0]->reg_idx = 0; + + if (ixgbe_cache_ring_sriov(adapter)) + return; + +#ifdef CONFIG_IXGBE_DCB + if (ixgbe_cache_ring_dcb(adapter)) + return; +#endif + +#ifdef IXGBE_FCOE + if (ixgbe_cache_ring_fcoe(adapter)) + return; +#endif /* IXGBE_FCOE */ + + if (ixgbe_cache_ring_fdir(adapter)) + return; + + if (ixgbe_cache_ring_rss(adapter)) + return; +} + +/** + * ixgbe_set_sriov_queues: Allocate queues for IOV use + * @adapter: board private structure to initialize + * + * IOV doesn't actually use anything, so just NAK the + * request for now and let the other queue routines + * figure out what to do. + */ +static inline bool ixgbe_set_sriov_queues(struct ixgbe_adapter *adapter) +{ + return false; +} + +/** + * ixgbe_set_rss_queues: Allocate queues for RSS + * @adapter: board private structure to initialize + * + * This is our "base" multiqueue mode. RSS (Receive Side Scaling) will try + * to allocate one Rx queue per CPU, and if available, one Tx queue per CPU. + * + **/ +static inline bool ixgbe_set_rss_queues(struct ixgbe_adapter *adapter) +{ + bool ret = false; + struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_RSS]; + + if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) { + f->mask = 0xF; + adapter->num_rx_queues = f->indices; + adapter->num_tx_queues = f->indices; + ret = true; + } + + return ret; +} + +/** + * ixgbe_set_fdir_queues: Allocate queues for Flow Director + * @adapter: board private structure to initialize + * + * Flow Director is an advanced Rx filter, attempting to get Rx flows back + * to the original CPU that initiated the Tx session. This runs in addition + * to RSS, so if a packet doesn't match an FDIR filter, we can still spread the + * Rx load across CPUs using RSS. + * + **/ +static inline bool ixgbe_set_fdir_queues(struct ixgbe_adapter *adapter) +{ + bool ret = false; + struct ixgbe_ring_feature *f_fdir = &adapter->ring_feature[RING_F_FDIR]; + + f_fdir->indices = min_t(int, num_online_cpus(), f_fdir->indices); + f_fdir->mask = 0; + + /* + * Use RSS in addition to Flow Director to ensure the best + * distribution of flows across cores, even when an FDIR flow + * isn't matched. + */ + if ((adapter->flags & IXGBE_FLAG_RSS_ENABLED) && + (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE)) { + adapter->num_tx_queues = f_fdir->indices; + adapter->num_rx_queues = f_fdir->indices; + ret = true; + } else { + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + } + return ret; +} + +#ifdef IXGBE_FCOE +/** + * ixgbe_set_fcoe_queues: Allocate queues for Fiber Channel over Ethernet (FCoE) + * @adapter: board private structure to initialize + * + * FCoE RX FCRETA can use up to 8 rx queues for up to 8 different exchanges. + * The ring feature mask is not used as a mask for FCoE, as it can take any 8 + * rx queues out of the max number of rx queues, instead, it is used as the + * index of the first rx queue used by FCoE. + * + **/ +static inline bool ixgbe_set_fcoe_queues(struct ixgbe_adapter *adapter) +{ + struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE]; + + if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED)) + return false; + + f->indices = min_t(int, num_online_cpus(), f->indices); + + adapter->num_rx_queues = 1; + adapter->num_tx_queues = 1; + + if (adapter->flags & IXGBE_FLAG_RSS_ENABLED) { + e_info(probe, "FCoE enabled with RSS\n"); + if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) + ixgbe_set_fdir_queues(adapter); + else + ixgbe_set_rss_queues(adapter); + } + + /* adding FCoE rx rings to the end */ + f->mask = adapter->num_rx_queues; + adapter->num_rx_queues += f->indices; + adapter->num_tx_queues += f->indices; + + return true; +} +#endif /* IXGBE_FCOE */ + +/* Artificial max queue cap per traffic class in DCB mode */ +#define DCB_QUEUE_CAP 8 + +#ifdef CONFIG_IXGBE_DCB +static inline bool ixgbe_set_dcb_queues(struct ixgbe_adapter *adapter) +{ + int per_tc_q, q, i, offset = 0; + struct net_device *dev = adapter->netdev; + int tcs = netdev_get_num_tc(dev); + + if (!tcs) + return false; + + /* Map queue offset and counts onto allocated tx queues */ + per_tc_q = min_t(unsigned int, dev->num_tx_queues / tcs, DCB_QUEUE_CAP); + q = min_t(int, num_online_cpus(), per_tc_q); + + for (i = 0; i < tcs; i++) { + netdev_set_tc_queue(dev, i, q, offset); + offset += q; + } + + adapter->num_tx_queues = q * tcs; + adapter->num_rx_queues = q * tcs; + +#ifdef IXGBE_FCOE + /* FCoE enabled queues require special configuration indexed + * by feature specific indices and mask. Here we map FCoE + * indices onto the DCB queue pairs allowing FCoE to own + * configuration later. + */ + if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) { + u8 prio_tc[MAX_USER_PRIORITY] = {0}; + int tc; + struct ixgbe_ring_feature *f = + &adapter->ring_feature[RING_F_FCOE]; + + ixgbe_dcb_unpack_map(&adapter->dcb_cfg, DCB_TX_CONFIG, prio_tc); + tc = prio_tc[adapter->fcoe.up]; + f->indices = dev->tc_to_txq[tc].count; + f->mask = dev->tc_to_txq[tc].offset; + } +#endif + + return true; +} +#endif + +/** + * ixgbe_set_num_queues: Allocate queues for device, feature dependent + * @adapter: board private structure to initialize + * + * This is the top level queue allocation routine. The order here is very + * important, starting with the "most" number of features turned on at once, + * and ending with the smallest set of features. This way large combinations + * can be allocated if they're turned on, and smaller combinations are the + * fallthrough conditions. + * + **/ +static int ixgbe_set_num_queues(struct ixgbe_adapter *adapter) +{ + /* Start with base case */ + adapter->num_rx_queues = 1; + adapter->num_tx_queues = 1; + adapter->num_rx_pools = adapter->num_rx_queues; + adapter->num_rx_queues_per_pool = 1; + + if (ixgbe_set_sriov_queues(adapter)) + goto done; + +#ifdef CONFIG_IXGBE_DCB + if (ixgbe_set_dcb_queues(adapter)) + goto done; + +#endif +#ifdef IXGBE_FCOE + if (ixgbe_set_fcoe_queues(adapter)) + goto done; + +#endif /* IXGBE_FCOE */ + if (ixgbe_set_fdir_queues(adapter)) + goto done; + + if (ixgbe_set_rss_queues(adapter)) + goto done; + + /* fallback to base case */ + adapter->num_rx_queues = 1; + adapter->num_tx_queues = 1; + +done: + if ((adapter->netdev->reg_state == NETREG_UNREGISTERED) || + (adapter->netdev->reg_state == NETREG_UNREGISTERING)) + return 0; + + /* Notify the stack of the (possibly) reduced queue counts. */ + netif_set_real_num_tx_queues(adapter->netdev, adapter->num_tx_queues); + return netif_set_real_num_rx_queues(adapter->netdev, + adapter->num_rx_queues); +} + +static void ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter, + int vectors) +{ + int err, vector_threshold; + + /* We'll want at least 2 (vector_threshold): + * 1) TxQ[0] + RxQ[0] handler + * 2) Other (Link Status Change, etc.) + */ + vector_threshold = MIN_MSIX_COUNT; + + /* + * The more we get, the more we will assign to Tx/Rx Cleanup + * for the separate queues...where Rx Cleanup >= Tx Cleanup. + * Right now, we simply care about how many we'll get; we'll + * set them up later while requesting irq's. + */ + while (vectors >= vector_threshold) { + err = pci_enable_msix(adapter->pdev, adapter->msix_entries, + vectors); + if (!err) /* Success in acquiring all requested vectors. */ + break; + else if (err < 0) + vectors = 0; /* Nasty failure, quit now */ + else /* err == number of vectors we should try again with */ + vectors = err; + } + + if (vectors < vector_threshold) { + /* Can't allocate enough MSI-X interrupts? Oh well. + * This just means we'll go with either a single MSI + * vector or fall back to legacy interrupts. + */ + netif_printk(adapter, hw, KERN_DEBUG, adapter->netdev, + "Unable to allocate MSI-X interrupts\n"); + adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED; + kfree(adapter->msix_entries); + adapter->msix_entries = NULL; + } else { + adapter->flags |= IXGBE_FLAG_MSIX_ENABLED; /* Woot! */ + /* + * Adjust for only the vectors we'll use, which is minimum + * of max_msix_q_vectors + NON_Q_VECTORS, or the number of + * vectors we were allocated. + */ + adapter->num_msix_vectors = min(vectors, + adapter->max_msix_q_vectors + NON_Q_VECTORS); + } +} + +static void ixgbe_add_ring(struct ixgbe_ring *ring, + struct ixgbe_ring_container *head) +{ + ring->next = head->ring; + head->ring = ring; + head->count++; +} + +/** + * ixgbe_alloc_q_vector - Allocate memory for a single interrupt vector + * @adapter: board private structure to initialize + * @v_idx: index of vector in adapter struct + * + * We allocate one q_vector. If allocation fails we return -ENOMEM. + **/ +static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter, int v_idx, + int txr_count, int txr_idx, + int rxr_count, int rxr_idx) +{ + struct ixgbe_q_vector *q_vector; + struct ixgbe_ring *ring; + int node = -1; + int cpu = -1; + int ring_count, size; + + ring_count = txr_count + rxr_count; + size = sizeof(struct ixgbe_q_vector) + + (sizeof(struct ixgbe_ring) * ring_count); + + /* customize cpu for Flow Director mapping */ + if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) { + if (cpu_online(v_idx)) { + cpu = v_idx; + node = cpu_to_node(cpu); + } + } + + /* allocate q_vector and rings */ + q_vector = kzalloc_node(size, GFP_KERNEL, node); + if (!q_vector) + q_vector = kzalloc(size, GFP_KERNEL); + if (!q_vector) + return -ENOMEM; + + /* setup affinity mask and node */ + if (cpu != -1) + cpumask_set_cpu(cpu, &q_vector->affinity_mask); + else + cpumask_copy(&q_vector->affinity_mask, cpu_online_mask); + q_vector->numa_node = node; + + /* initialize NAPI */ + netif_napi_add(adapter->netdev, &q_vector->napi, + ixgbe_poll, 64); + + /* tie q_vector and adapter together */ + adapter->q_vector[v_idx] = q_vector; + q_vector->adapter = adapter; + q_vector->v_idx = v_idx; + + /* initialize work limits */ + q_vector->tx.work_limit = adapter->tx_work_limit; + + /* initialize pointer to rings */ + ring = q_vector->ring; + + while (txr_count) { + /* assign generic ring traits */ + ring->dev = &adapter->pdev->dev; + ring->netdev = adapter->netdev; + + /* configure backlink on ring */ + ring->q_vector = q_vector; + + /* update q_vector Tx values */ + ixgbe_add_ring(ring, &q_vector->tx); + + /* apply Tx specific ring traits */ + ring->count = adapter->tx_ring_count; + ring->queue_index = txr_idx; + + /* assign ring to adapter */ + adapter->tx_ring[txr_idx] = ring; + + /* update count and index */ + txr_count--; + txr_idx++; + + /* push pointer to next ring */ + ring++; + } + + while (rxr_count) { + /* assign generic ring traits */ + ring->dev = &adapter->pdev->dev; + ring->netdev = adapter->netdev; + + /* configure backlink on ring */ + ring->q_vector = q_vector; + + /* update q_vector Rx values */ + ixgbe_add_ring(ring, &q_vector->rx); + + /* + * 82599 errata, UDP frames with a 0 checksum + * can be marked as checksum errors. + */ + if (adapter->hw.mac.type == ixgbe_mac_82599EB) + set_bit(__IXGBE_RX_CSUM_UDP_ZERO_ERR, &ring->state); + + /* apply Rx specific ring traits */ + ring->count = adapter->rx_ring_count; + ring->queue_index = rxr_idx; + + /* assign ring to adapter */ + adapter->rx_ring[rxr_idx] = ring; + + /* update count and index */ + rxr_count--; + rxr_idx++; + + /* push pointer to next ring */ + ring++; + } + + return 0; +} + +/** + * ixgbe_free_q_vector - Free memory allocated for specific interrupt vector + * @adapter: board private structure to initialize + * @v_idx: Index of vector to be freed + * + * This function frees the memory allocated to the q_vector. In addition if + * NAPI is enabled it will delete any references to the NAPI struct prior + * to freeing the q_vector. + **/ +static void ixgbe_free_q_vector(struct ixgbe_adapter *adapter, int v_idx) +{ + struct ixgbe_q_vector *q_vector = adapter->q_vector[v_idx]; + struct ixgbe_ring *ring; + + ixgbe_for_each_ring(ring, q_vector->tx) + adapter->tx_ring[ring->queue_index] = NULL; + + ixgbe_for_each_ring(ring, q_vector->rx) + adapter->rx_ring[ring->queue_index] = NULL; + + adapter->q_vector[v_idx] = NULL; + netif_napi_del(&q_vector->napi); + + /* + * ixgbe_get_stats64() might access the rings on this vector, + * we must wait a grace period before freeing it. + */ + kfree_rcu(q_vector, rcu); +} + +/** + * ixgbe_alloc_q_vectors - Allocate memory for interrupt vectors + * @adapter: board private structure to initialize + * + * We allocate one q_vector per queue interrupt. If allocation fails we + * return -ENOMEM. + **/ +static int ixgbe_alloc_q_vectors(struct ixgbe_adapter *adapter) +{ + int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS; + int rxr_remaining = adapter->num_rx_queues; + int txr_remaining = adapter->num_tx_queues; + int rxr_idx = 0, txr_idx = 0, v_idx = 0; + int err; + + /* only one q_vector if MSI-X is disabled. */ + if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) + q_vectors = 1; + + if (q_vectors >= (rxr_remaining + txr_remaining)) { + for (; rxr_remaining; v_idx++, q_vectors--) { + int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors); + err = ixgbe_alloc_q_vector(adapter, v_idx, + 0, 0, rqpv, rxr_idx); + + if (err) + goto err_out; + + /* update counts and index */ + rxr_remaining -= rqpv; + rxr_idx += rqpv; + } + } + + for (; q_vectors; v_idx++, q_vectors--) { + int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors); + int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors); + err = ixgbe_alloc_q_vector(adapter, v_idx, + tqpv, txr_idx, + rqpv, rxr_idx); + + if (err) + goto err_out; + + /* update counts and index */ + rxr_remaining -= rqpv; + rxr_idx += rqpv; + txr_remaining -= tqpv; + txr_idx += tqpv; + } + + return 0; + +err_out: + while (v_idx) { + v_idx--; + ixgbe_free_q_vector(adapter, v_idx); + } + + return -ENOMEM; +} + +/** + * ixgbe_free_q_vectors - Free memory allocated for interrupt vectors + * @adapter: board private structure to initialize + * + * This function frees the memory allocated to the q_vectors. In addition if + * NAPI is enabled it will delete any references to the NAPI struct prior + * to freeing the q_vector. + **/ +static void ixgbe_free_q_vectors(struct ixgbe_adapter *adapter) +{ + int v_idx, q_vectors; + + if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) + q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS; + else + q_vectors = 1; + + for (v_idx = 0; v_idx < q_vectors; v_idx++) + ixgbe_free_q_vector(adapter, v_idx); +} + +static void ixgbe_reset_interrupt_capability(struct ixgbe_adapter *adapter) +{ + if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) { + adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED; + pci_disable_msix(adapter->pdev); + kfree(adapter->msix_entries); + adapter->msix_entries = NULL; + } else if (adapter->flags & IXGBE_FLAG_MSI_ENABLED) { + adapter->flags &= ~IXGBE_FLAG_MSI_ENABLED; + pci_disable_msi(adapter->pdev); + } +} + +/** + * ixgbe_set_interrupt_capability - set MSI-X or MSI if supported + * @adapter: board private structure to initialize + * + * Attempt to configure the interrupts using the best available + * capabilities of the hardware and the kernel. + **/ +static int ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter) +{ + struct ixgbe_hw *hw = &adapter->hw; + int err = 0; + int vector, v_budget; + + /* + * It's easy to be greedy for MSI-X vectors, but it really + * doesn't do us much good if we have a lot more vectors + * than CPU's. So let's be conservative and only ask for + * (roughly) the same number of vectors as there are CPU's. + * The default is to use pairs of vectors. + */ + v_budget = max(adapter->num_rx_queues, adapter->num_tx_queues); + v_budget = min_t(int, v_budget, num_online_cpus()); + v_budget += NON_Q_VECTORS; + + /* + * At the same time, hardware can only support a maximum of + * hw.mac->max_msix_vectors vectors. With features + * such as RSS and VMDq, we can easily surpass the number of Rx and Tx + * descriptor queues supported by our device. Thus, we cap it off in + * those rare cases where the cpu count also exceeds our vector limit. + */ + v_budget = min_t(int, v_budget, hw->mac.max_msix_vectors); + + /* A failure in MSI-X entry allocation isn't fatal, but it does + * mean we disable MSI-X capabilities of the adapter. */ + adapter->msix_entries = kcalloc(v_budget, + sizeof(struct msix_entry), GFP_KERNEL); + if (adapter->msix_entries) { + for (vector = 0; vector < v_budget; vector++) + adapter->msix_entries[vector].entry = vector; + + ixgbe_acquire_msix_vectors(adapter, v_budget); + + if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) + goto out; + } + + adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED; + adapter->flags &= ~IXGBE_FLAG_RSS_ENABLED; + if (adapter->flags & IXGBE_FLAG_FDIR_HASH_CAPABLE) { + e_err(probe, + "ATR is not supported while multiple " + "queues are disabled. Disabling Flow Director\n"); + } + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + adapter->atr_sample_rate = 0; + if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) + ixgbe_disable_sriov(adapter); + + err = ixgbe_set_num_queues(adapter); + if (err) + return err; + + err = pci_enable_msi(adapter->pdev); + if (!err) { + adapter->flags |= IXGBE_FLAG_MSI_ENABLED; + } else { + netif_printk(adapter, hw, KERN_DEBUG, adapter->netdev, + "Unable to allocate MSI interrupt, " + "falling back to legacy. Error: %d\n", err); + /* reset err */ + err = 0; + } + +out: + return err; +} + +/** + * ixgbe_init_interrupt_scheme - Determine proper interrupt scheme + * @adapter: board private structure to initialize + * + * We determine which interrupt scheme to use based on... + * - Kernel support (MSI, MSI-X) + * - which can be user-defined (via MODULE_PARAM) + * - Hardware queue count (num_*_queues) + * - defined by miscellaneous hardware support/features (RSS, etc.) + **/ +int ixgbe_init_interrupt_scheme(struct ixgbe_adapter *adapter) +{ + int err; + + /* Number of supported queues */ + err = ixgbe_set_num_queues(adapter); + if (err) + return err; + + err = ixgbe_set_interrupt_capability(adapter); + if (err) { + e_dev_err("Unable to setup interrupt capabilities\n"); + goto err_set_interrupt; + } + + err = ixgbe_alloc_q_vectors(adapter); + if (err) { + e_dev_err("Unable to allocate memory for queue vectors\n"); + goto err_alloc_q_vectors; + } + + ixgbe_cache_ring_register(adapter); + + e_dev_info("Multiqueue %s: Rx Queue count = %u, Tx Queue count = %u\n", + (adapter->num_rx_queues > 1) ? "Enabled" : "Disabled", + adapter->num_rx_queues, adapter->num_tx_queues); + + set_bit(__IXGBE_DOWN, &adapter->state); + + return 0; + +err_alloc_q_vectors: + ixgbe_reset_interrupt_capability(adapter); +err_set_interrupt: + return err; +} + +/** + * ixgbe_clear_interrupt_scheme - Clear the current interrupt scheme settings + * @adapter: board private structure to clear interrupt scheme on + * + * We go through and clear interrupt specific resources and reset the structure + * to pre-load conditions + **/ +void ixgbe_clear_interrupt_scheme(struct ixgbe_adapter *adapter) +{ + adapter->num_tx_queues = 0; + adapter->num_rx_queues = 0; + + ixgbe_free_q_vectors(adapter); + ixgbe_reset_interrupt_capability(adapter); +} + +void ixgbe_tx_ctxtdesc(struct ixgbe_ring *tx_ring, u32 vlan_macip_lens, + u32 fcoe_sof_eof, u32 type_tucmd, u32 mss_l4len_idx) +{ + struct ixgbe_adv_tx_context_desc *context_desc; + u16 i = tx_ring->next_to_use; + + context_desc = IXGBE_TX_CTXTDESC(tx_ring, i); + + i++; + tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; + + /* set bits to identify this as an advanced context descriptor */ + type_tucmd |= IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT; + + context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens); + context_desc->seqnum_seed = cpu_to_le32(fcoe_sof_eof); + context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd); + context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx); +} + |