diff options
Diffstat (limited to 'kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c')
| -rw-r--r-- | kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c | 1221 |
1 files changed, 1221 insertions, 0 deletions
diff --git a/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c b/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c new file mode 100644 index 000000000..68e1e757e --- /dev/null +++ b/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c @@ -0,0 +1,1221 @@ +/******************************************************************************* + + Intel 10 Gigabit PCI Express Linux driver + Copyright(c) 1999 - 2013 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: + Linux NICS <linux.nics@intel.com> + 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" + +#ifdef CONFIG_IXGBE_DCB +/** + * ixgbe_cache_ring_dcb_sriov - Descriptor ring to register mapping for SR-IOV + * @adapter: board private structure to initialize + * + * Cache the descriptor ring offsets for SR-IOV to the assigned rings. It + * will also try to cache the proper offsets if RSS/FCoE are enabled along + * with VMDq. + * + **/ +static bool ixgbe_cache_ring_dcb_sriov(struct ixgbe_adapter *adapter) +{ +#ifdef IXGBE_FCOE + struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE]; +#endif /* IXGBE_FCOE */ + struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ]; + int i; + u16 reg_idx; + u8 tcs = netdev_get_num_tc(adapter->netdev); + + /* verify we have DCB queueing enabled before proceeding */ + if (tcs <= 1) + return false; + + /* verify we have VMDq enabled before proceeding */ + if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) + return false; + + /* start at VMDq register offset for SR-IOV enabled setups */ + reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask); + for (i = 0; i < adapter->num_rx_queues; i++, reg_idx++) { + /* If we are greater than indices move to next pool */ + if ((reg_idx & ~vmdq->mask) >= tcs) + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask); + adapter->rx_ring[i]->reg_idx = reg_idx; + } + + reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask); + for (i = 0; i < adapter->num_tx_queues; i++, reg_idx++) { + /* If we are greater than indices move to next pool */ + if ((reg_idx & ~vmdq->mask) >= tcs) + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask); + adapter->tx_ring[i]->reg_idx = reg_idx; + } + +#ifdef IXGBE_FCOE + /* nothing to do if FCoE is disabled */ + if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED)) + return true; + + /* The work is already done if the FCoE ring is shared */ + if (fcoe->offset < tcs) + return true; + + /* The FCoE rings exist separately, we need to move their reg_idx */ + if (fcoe->indices) { + u16 queues_per_pool = __ALIGN_MASK(1, ~vmdq->mask); + u8 fcoe_tc = ixgbe_fcoe_get_tc(adapter); + + reg_idx = (vmdq->offset + vmdq->indices) * queues_per_pool; + for (i = fcoe->offset; i < adapter->num_rx_queues; i++) { + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask) + fcoe_tc; + adapter->rx_ring[i]->reg_idx = reg_idx; + reg_idx++; + } + + reg_idx = (vmdq->offset + vmdq->indices) * queues_per_pool; + for (i = fcoe->offset; i < adapter->num_tx_queues; i++) { + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask) + fcoe_tc; + adapter->tx_ring[i]->reg_idx = reg_idx; + reg_idx++; + } + } + +#endif /* IXGBE_FCOE */ + return true; +} + +/* 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: + /* TxQs/TC: 4 RxQs/TC: 8 */ + *tx = tc << 2; /* 0, 4, 8, 12, 16, 20, 24, 28 */ + *rx = tc << 3; /* 0, 8, 16, 24, 32, 40, 48, 56 */ + break; + case ixgbe_mac_82599EB: + case ixgbe_mac_X540: + case ixgbe_mac_X550: + case ixgbe_mac_X550EM_x: + if (num_tcs > 4) { + /* + * TCs : TC0/1 TC2/3 TC4-7 + * TxQs/TC: 32 16 8 + * RxQs/TC: 16 16 16 + */ + *rx = tc << 4; + if (tc < 3) + *tx = tc << 5; /* 0, 32, 64 */ + else if (tc < 5) + *tx = (tc + 2) << 4; /* 80, 96 */ + else + *tx = (tc + 8) << 3; /* 104, 112, 120 */ + } else { + /* + * TCs : TC0 TC1 TC2/3 + * TxQs/TC: 64 32 16 + * RxQs/TC: 32 32 32 + */ + *rx = tc << 5; + if (tc < 2) + *tx = tc << 6; /* 0, 64 */ + else + *tx = (tc + 4) << 4; /* 96, 112 */ + } + 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 bool ixgbe_cache_ring_dcb(struct ixgbe_adapter *adapter) +{ + struct net_device *dev = adapter->netdev; + unsigned int tx_idx, rx_idx; + int tc, offset, rss_i, i; + u8 num_tcs = netdev_get_num_tc(dev); + + /* verify we have DCB queueing enabled before proceeding */ + if (num_tcs <= 1) + return false; + + rss_i = adapter->ring_feature[RING_F_RSS].indices; + + for (tc = 0, offset = 0; tc < num_tcs; tc++, offset += rss_i) { + ixgbe_get_first_reg_idx(adapter, tc, &tx_idx, &rx_idx); + for (i = 0; i < rss_i; i++, tx_idx++, rx_idx++) { + adapter->tx_ring[offset + i]->reg_idx = tx_idx; + adapter->rx_ring[offset + i]->reg_idx = rx_idx; + adapter->tx_ring[offset + i]->dcb_tc = tc; + adapter->rx_ring[offset + i]->dcb_tc = tc; + } + } + + return true; +} + +#endif +/** + * 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 bool ixgbe_cache_ring_sriov(struct ixgbe_adapter *adapter) +{ +#ifdef IXGBE_FCOE + struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE]; +#endif /* IXGBE_FCOE */ + struct ixgbe_ring_feature *vmdq = &adapter->ring_feature[RING_F_VMDQ]; + struct ixgbe_ring_feature *rss = &adapter->ring_feature[RING_F_RSS]; + int i; + u16 reg_idx; + + /* only proceed if VMDq is enabled */ + if (!(adapter->flags & IXGBE_FLAG_VMDQ_ENABLED)) + return false; + + /* start at VMDq register offset for SR-IOV enabled setups */ + reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask); + for (i = 0; i < adapter->num_rx_queues; i++, reg_idx++) { +#ifdef IXGBE_FCOE + /* Allow first FCoE queue to be mapped as RSS */ + if (fcoe->offset && (i > fcoe->offset)) + break; +#endif + /* If we are greater than indices move to next pool */ + if ((reg_idx & ~vmdq->mask) >= rss->indices) + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask); + adapter->rx_ring[i]->reg_idx = reg_idx; + } + +#ifdef IXGBE_FCOE + /* FCoE uses a linear block of queues so just assigning 1:1 */ + for (; i < adapter->num_rx_queues; i++, reg_idx++) + adapter->rx_ring[i]->reg_idx = reg_idx; + +#endif + reg_idx = vmdq->offset * __ALIGN_MASK(1, ~vmdq->mask); + for (i = 0; i < adapter->num_tx_queues; i++, reg_idx++) { +#ifdef IXGBE_FCOE + /* Allow first FCoE queue to be mapped as RSS */ + if (fcoe->offset && (i > fcoe->offset)) + break; +#endif + /* If we are greater than indices move to next pool */ + if ((reg_idx & rss->mask) >= rss->indices) + reg_idx = __ALIGN_MASK(reg_idx, ~vmdq->mask); + adapter->tx_ring[i]->reg_idx = reg_idx; + } + +#ifdef IXGBE_FCOE + /* FCoE uses a linear block of queues so just assigning 1:1 */ + for (; i < adapter->num_tx_queues; i++, reg_idx++) + adapter->tx_ring[i]->reg_idx = reg_idx; + +#endif + + return true; +} + +/** + * 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 bool ixgbe_cache_ring_rss(struct ixgbe_adapter *adapter) +{ + int i; + + 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; +} + +/** + * 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; + +#ifdef CONFIG_IXGBE_DCB + if (ixgbe_cache_ring_dcb_sriov(adapter)) + return; + + if (ixgbe_cache_ring_dcb(adapter)) + return; + +#endif + if (ixgbe_cache_ring_sriov(adapter)) + return; + + ixgbe_cache_ring_rss(adapter); +} + +#define IXGBE_RSS_16Q_MASK 0xF +#define IXGBE_RSS_8Q_MASK 0x7 +#define IXGBE_RSS_4Q_MASK 0x3 +#define IXGBE_RSS_2Q_MASK 0x1 +#define IXGBE_RSS_DISABLED_MASK 0x0 + +#ifdef CONFIG_IXGBE_DCB +/** + * ixgbe_set_dcb_sriov_queues: Allocate queues for SR-IOV devices w/ DCB + * @adapter: board private structure to initialize + * + * When SR-IOV (Single Root IO Virtualiztion) is enabled, allocate queues + * and VM pools where appropriate. Also assign queues based on DCB + * priorities and map accordingly.. + * + **/ +static bool ixgbe_set_dcb_sriov_queues(struct ixgbe_adapter *adapter) +{ + int i; + u16 vmdq_i = adapter->ring_feature[RING_F_VMDQ].limit; + u16 vmdq_m = 0; +#ifdef IXGBE_FCOE + u16 fcoe_i = 0; +#endif + u8 tcs = netdev_get_num_tc(adapter->netdev); + + /* verify we have DCB queueing enabled before proceeding */ + if (tcs <= 1) + return false; + + /* verify we have VMDq enabled before proceeding */ + if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) + return false; + + /* Add starting offset to total pool count */ + vmdq_i += adapter->ring_feature[RING_F_VMDQ].offset; + + /* 16 pools w/ 8 TC per pool */ + if (tcs > 4) { + vmdq_i = min_t(u16, vmdq_i, 16); + vmdq_m = IXGBE_82599_VMDQ_8Q_MASK; + /* 32 pools w/ 4 TC per pool */ + } else { + vmdq_i = min_t(u16, vmdq_i, 32); + vmdq_m = IXGBE_82599_VMDQ_4Q_MASK; + } + +#ifdef IXGBE_FCOE + /* queues in the remaining pools are available for FCoE */ + fcoe_i = (128 / __ALIGN_MASK(1, ~vmdq_m)) - vmdq_i; + +#endif + /* remove the starting offset from the pool count */ + vmdq_i -= adapter->ring_feature[RING_F_VMDQ].offset; + + /* save features for later use */ + adapter->ring_feature[RING_F_VMDQ].indices = vmdq_i; + adapter->ring_feature[RING_F_VMDQ].mask = vmdq_m; + + /* + * We do not support DCB, VMDq, and RSS all simultaneously + * so we will disable RSS since it is the lowest priority + */ + adapter->ring_feature[RING_F_RSS].indices = 1; + adapter->ring_feature[RING_F_RSS].mask = IXGBE_RSS_DISABLED_MASK; + + /* disable ATR as it is not supported when VMDq is enabled */ + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + + adapter->num_rx_pools = vmdq_i; + adapter->num_rx_queues_per_pool = tcs; + + adapter->num_tx_queues = vmdq_i * tcs; + adapter->num_rx_queues = vmdq_i * tcs; + +#ifdef IXGBE_FCOE + if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) { + struct ixgbe_ring_feature *fcoe; + + fcoe = &adapter->ring_feature[RING_F_FCOE]; + + /* limit ourselves based on feature limits */ + fcoe_i = min_t(u16, fcoe_i, fcoe->limit); + + if (fcoe_i) { + /* alloc queues for FCoE separately */ + fcoe->indices = fcoe_i; + fcoe->offset = vmdq_i * tcs; + + /* add queues to adapter */ + adapter->num_tx_queues += fcoe_i; + adapter->num_rx_queues += fcoe_i; + } else if (tcs > 1) { + /* use queue belonging to FcoE TC */ + fcoe->indices = 1; + fcoe->offset = ixgbe_fcoe_get_tc(adapter); + } else { + adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED; + + fcoe->indices = 0; + fcoe->offset = 0; + } + } + +#endif /* IXGBE_FCOE */ + /* configure TC to queue mapping */ + for (i = 0; i < tcs; i++) + netdev_set_tc_queue(adapter->netdev, i, 1, i); + + return true; +} + +static bool ixgbe_set_dcb_queues(struct ixgbe_adapter *adapter) +{ + struct net_device *dev = adapter->netdev; + struct ixgbe_ring_feature *f; + int rss_i, rss_m, i; + int tcs; + + /* Map queue offset and counts onto allocated tx queues */ + tcs = netdev_get_num_tc(dev); + + /* verify we have DCB queueing enabled before proceeding */ + if (tcs <= 1) + return false; + + /* determine the upper limit for our current DCB mode */ + rss_i = dev->num_tx_queues / tcs; + if (adapter->hw.mac.type == ixgbe_mac_82598EB) { + /* 8 TC w/ 4 queues per TC */ + rss_i = min_t(u16, rss_i, 4); + rss_m = IXGBE_RSS_4Q_MASK; + } else if (tcs > 4) { + /* 8 TC w/ 8 queues per TC */ + rss_i = min_t(u16, rss_i, 8); + rss_m = IXGBE_RSS_8Q_MASK; + } else { + /* 4 TC w/ 16 queues per TC */ + rss_i = min_t(u16, rss_i, 16); + rss_m = IXGBE_RSS_16Q_MASK; + } + + /* set RSS mask and indices */ + f = &adapter->ring_feature[RING_F_RSS]; + rss_i = min_t(int, rss_i, f->limit); + f->indices = rss_i; + f->mask = rss_m; + + /* disable ATR as it is not supported when multiple TCs are enabled */ + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + +#ifdef IXGBE_FCOE + /* FCoE enabled queues require special configuration indexed + * by feature specific indices and offset. Here we map FCoE + * indices onto the DCB queue pairs allowing FCoE to own + * configuration later. + */ + if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) { + u8 tc = ixgbe_fcoe_get_tc(adapter); + + f = &adapter->ring_feature[RING_F_FCOE]; + f->indices = min_t(u16, rss_i, f->limit); + f->offset = rss_i * tc; + } + +#endif /* IXGBE_FCOE */ + for (i = 0; i < tcs; i++) + netdev_set_tc_queue(dev, i, rss_i, rss_i * i); + + adapter->num_tx_queues = rss_i * tcs; + adapter->num_rx_queues = rss_i * tcs; + + return true; +} + +#endif +/** + * ixgbe_set_sriov_queues - Allocate queues for SR-IOV devices + * @adapter: board private structure to initialize + * + * When SR-IOV (Single Root IO Virtualiztion) is enabled, allocate queues + * and VM pools where appropriate. If RSS is available, then also try and + * enable RSS and map accordingly. + * + **/ +static bool ixgbe_set_sriov_queues(struct ixgbe_adapter *adapter) +{ + u16 vmdq_i = adapter->ring_feature[RING_F_VMDQ].limit; + u16 vmdq_m = 0; + u16 rss_i = adapter->ring_feature[RING_F_RSS].limit; + u16 rss_m = IXGBE_RSS_DISABLED_MASK; +#ifdef IXGBE_FCOE + u16 fcoe_i = 0; +#endif + bool pools = (find_first_zero_bit(&adapter->fwd_bitmask, 32) > 1); + + /* only proceed if SR-IOV is enabled */ + if (!(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) + return false; + + /* Add starting offset to total pool count */ + vmdq_i += adapter->ring_feature[RING_F_VMDQ].offset; + + /* double check we are limited to maximum pools */ + vmdq_i = min_t(u16, IXGBE_MAX_VMDQ_INDICES, vmdq_i); + + /* 64 pool mode with 2 queues per pool */ + if ((vmdq_i > 32) || (rss_i < 4) || (vmdq_i > 16 && pools)) { + vmdq_m = IXGBE_82599_VMDQ_2Q_MASK; + rss_m = IXGBE_RSS_2Q_MASK; + rss_i = min_t(u16, rss_i, 2); + /* 32 pool mode with 4 queues per pool */ + } else { + vmdq_m = IXGBE_82599_VMDQ_4Q_MASK; + rss_m = IXGBE_RSS_4Q_MASK; + rss_i = 4; + } + +#ifdef IXGBE_FCOE + /* queues in the remaining pools are available for FCoE */ + fcoe_i = 128 - (vmdq_i * __ALIGN_MASK(1, ~vmdq_m)); + +#endif + /* remove the starting offset from the pool count */ + vmdq_i -= adapter->ring_feature[RING_F_VMDQ].offset; + + /* save features for later use */ + adapter->ring_feature[RING_F_VMDQ].indices = vmdq_i; + adapter->ring_feature[RING_F_VMDQ].mask = vmdq_m; + + /* limit RSS based on user input and save for later use */ + adapter->ring_feature[RING_F_RSS].indices = rss_i; + adapter->ring_feature[RING_F_RSS].mask = rss_m; + + adapter->num_rx_pools = vmdq_i; + adapter->num_rx_queues_per_pool = rss_i; + + adapter->num_rx_queues = vmdq_i * rss_i; + adapter->num_tx_queues = vmdq_i * rss_i; + + /* disable ATR as it is not supported when VMDq is enabled */ + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + +#ifdef IXGBE_FCOE + /* + * FCoE can use rings from adjacent buffers to allow RSS + * like behavior. To account for this we need to add the + * FCoE indices to the total ring count. + */ + if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) { + struct ixgbe_ring_feature *fcoe; + + fcoe = &adapter->ring_feature[RING_F_FCOE]; + + /* limit ourselves based on feature limits */ + fcoe_i = min_t(u16, fcoe_i, fcoe->limit); + + if (vmdq_i > 1 && fcoe_i) { + /* alloc queues for FCoE separately */ + fcoe->indices = fcoe_i; + fcoe->offset = vmdq_i * rss_i; + } else { + /* merge FCoE queues with RSS queues */ + fcoe_i = min_t(u16, fcoe_i + rss_i, num_online_cpus()); + + /* limit indices to rss_i if MSI-X is disabled */ + if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) + fcoe_i = rss_i; + + /* attempt to reserve some queues for just FCoE */ + fcoe->indices = min_t(u16, fcoe_i, fcoe->limit); + fcoe->offset = fcoe_i - fcoe->indices; + + fcoe_i -= rss_i; + } + + /* add queues to adapter */ + adapter->num_tx_queues += fcoe_i; + adapter->num_rx_queues += fcoe_i; + } + +#endif + return true; +} + +/** + * 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 bool ixgbe_set_rss_queues(struct ixgbe_adapter *adapter) +{ + struct ixgbe_ring_feature *f; + u16 rss_i; + + /* set mask for 16 queue limit of RSS */ + f = &adapter->ring_feature[RING_F_RSS]; + rss_i = f->limit; + + f->indices = rss_i; + f->mask = IXGBE_RSS_16Q_MASK; + + /* disable ATR by default, it will be configured below */ + adapter->flags &= ~IXGBE_FLAG_FDIR_HASH_CAPABLE; + + /* + * Use Flow Director in addition to RSS to ensure the best + * distribution of flows across cores, even when an FDIR flow + * isn't matched. + */ + if (rss_i > 1 && adapter->atr_sample_rate) { + f = &adapter->ring_feature[RING_F_FDIR]; + + rss_i = f->indices = f->limit; + + if (!(adapter->flags & IXGBE_FLAG_FDIR_PERFECT_CAPABLE)) + adapter->flags |= IXGBE_FLAG_FDIR_HASH_CAPABLE; + } + +#ifdef IXGBE_FCOE + /* + * FCoE can exist on the same rings as standard network traffic + * however it is preferred to avoid that if possible. In order + * to get the best performance we allocate as many FCoE queues + * as we can and we place them at the end of the ring array to + * avoid sharing queues with standard RSS on systems with 24 or + * more CPUs. + */ + if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED) { + struct net_device *dev = adapter->netdev; + u16 fcoe_i; + + f = &adapter->ring_feature[RING_F_FCOE]; + + /* merge FCoE queues with RSS queues */ + fcoe_i = min_t(u16, f->limit + rss_i, num_online_cpus()); + fcoe_i = min_t(u16, fcoe_i, dev->num_tx_queues); + + /* limit indices to rss_i if MSI-X is disabled */ + if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) + fcoe_i = rss_i; + + /* attempt to reserve some queues for just FCoE */ + f->indices = min_t(u16, fcoe_i, f->limit); + f->offset = fcoe_i - f->indices; + rss_i = max_t(u16, fcoe_i, rss_i); + } + +#endif /* IXGBE_FCOE */ + adapter->num_rx_queues = rss_i; + adapter->num_tx_queues = rss_i; + + return true; +} + +/** + * 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 void 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; + +#ifdef CONFIG_IXGBE_DCB + if (ixgbe_set_dcb_sriov_queues(adapter)) + return; + + if (ixgbe_set_dcb_queues(adapter)) + return; + +#endif + if (ixgbe_set_sriov_queues(adapter)) + return; + + ixgbe_set_rss_queues(adapter); +} + +/** + * ixgbe_acquire_msix_vectors - acquire MSI-X vectors + * @adapter: board private structure + * + * Attempts to acquire a suitable range of MSI-X vector interrupts. Will + * return a negative error code if unable to acquire MSI-X vectors for any + * reason. + */ +static int ixgbe_acquire_msix_vectors(struct ixgbe_adapter *adapter) +{ + struct ixgbe_hw *hw = &adapter->hw; + int i, vectors, vector_threshold; + + /* We start by asking for one vector per queue pair */ + vectors = max(adapter->num_rx_queues, adapter->num_tx_queues); + + /* It is easy to be greedy for MSI-X vectors. However, it really + * doesn't do much good if we have a lot more vectors than CPUs. We'll + * be somewhat conservative and only ask for (roughly) the same number + * of vectors as there are CPUs. + */ + vectors = min_t(int, vectors, num_online_cpus()); + + /* Some vectors are necessary for non-queue interrupts */ + vectors += NON_Q_VECTORS; + + /* Hardware can only support a maximum of hw.mac->max_msix_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 the maximum in the rare cases where the CPU count also + * exceeds our vector limit + */ + vectors = min_t(int, vectors, hw->mac.max_msix_vectors); + + /* We want a minimum of two MSI-X vectors for (1) a TxQ[0] + RxQ[0] + * handler, and (2) an Other (Link Status Change, etc.) handler. + */ + vector_threshold = MIN_MSIX_COUNT; + + adapter->msix_entries = kcalloc(vectors, + sizeof(struct msix_entry), + GFP_KERNEL); + if (!adapter->msix_entries) + return -ENOMEM; + + for (i = 0; i < vectors; i++) + adapter->msix_entries[i].entry = i; + + vectors = pci_enable_msix_range(adapter->pdev, adapter->msix_entries, + vector_threshold, vectors); + + if (vectors < 0) { + /* A negative count of allocated vectors indicates an error in + * acquiring within the specified range of MSI-X vectors + */ + e_dev_warn("Failed to allocate MSI-X interrupts. Err: %d\n", + vectors); + + adapter->flags &= ~IXGBE_FLAG_MSIX_ENABLED; + kfree(adapter->msix_entries); + adapter->msix_entries = NULL; + + return vectors; + } + + /* we successfully allocated some number of vectors within our + * requested range. + */ + adapter->flags |= IXGBE_FLAG_MSIX_ENABLED; + + /* Adjust for only the vectors we'll use, which is minimum + * of max_q_vectors, or the number of vectors we were allocated. + */ + vectors -= NON_Q_VECTORS; + adapter->num_q_vectors = min_t(int, vectors, adapter->max_q_vectors); + + return 0; +} + +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_count: q_vectors allocated on adapter, used for ring interleaving + * @v_idx: index of vector in adapter struct + * @txr_count: total number of Tx rings to allocate + * @txr_idx: index of first Tx ring to allocate + * @rxr_count: total number of Rx rings to allocate + * @rxr_idx: index of first Rx ring to allocate + * + * We allocate one q_vector. If allocation fails we return -ENOMEM. + **/ +static int ixgbe_alloc_q_vector(struct ixgbe_adapter *adapter, + int v_count, 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 = NUMA_NO_NODE; + int cpu = -1; + int ring_count, size; + u8 tcs = netdev_get_num_tc(adapter->netdev); + + 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 ((tcs <= 1) && !(adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)) { + u16 rss_i = adapter->ring_feature[RING_F_RSS].indices; + if (rss_i > 1 && adapter->atr_sample_rate) { + 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); + q_vector->numa_node = node; + +#ifdef CONFIG_IXGBE_DCA + /* initialize CPU for DCA */ + q_vector->cpu = -1; + +#endif + /* initialize NAPI */ + netif_napi_add(adapter->netdev, &q_vector->napi, + ixgbe_poll, 64); + napi_hash_add(&q_vector->napi); + +#ifdef CONFIG_NET_RX_BUSY_POLL + /* initialize busy poll */ + atomic_set(&q_vector->state, IXGBE_QV_STATE_DISABLE); + +#endif + /* 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; + + /* intialize ITR */ + if (txr_count && !rxr_count) { + /* tx only vector */ + if (adapter->tx_itr_setting == 1) + q_vector->itr = IXGBE_10K_ITR; + else + q_vector->itr = adapter->tx_itr_setting; + } else { + /* rx or rx/tx vector */ + if (adapter->rx_itr_setting == 1) + q_vector->itr = IXGBE_20K_ITR; + else + q_vector->itr = adapter->rx_itr_setting; + } + + 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; + if (adapter->num_rx_pools > 1) + ring->queue_index = + txr_idx % adapter->num_rx_queues_per_pool; + else + ring->queue_index = txr_idx; + + /* assign ring to adapter */ + adapter->tx_ring[txr_idx] = ring; + + /* update count and index */ + txr_count--; + txr_idx += v_count; + + /* 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); + +#ifdef IXGBE_FCOE + if (adapter->netdev->features & NETIF_F_FCOE_MTU) { + struct ixgbe_ring_feature *f; + f = &adapter->ring_feature[RING_F_FCOE]; + if ((rxr_idx >= f->offset) && + (rxr_idx < f->offset + f->indices)) + set_bit(__IXGBE_RX_FCOE, &ring->state); + } + +#endif /* IXGBE_FCOE */ + /* apply Rx specific ring traits */ + ring->count = adapter->rx_ring_count; + if (adapter->num_rx_pools > 1) + ring->queue_index = + rxr_idx % adapter->num_rx_queues_per_pool; + else + ring->queue_index = rxr_idx; + + /* assign ring to adapter */ + adapter->rx_ring[rxr_idx] = ring; + + /* update count and index */ + rxr_count--; + rxr_idx += v_count; + + /* 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; + napi_hash_del(&q_vector->napi); + 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_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++) { + err = ixgbe_alloc_q_vector(adapter, q_vectors, v_idx, + 0, 0, 1, rxr_idx); + + if (err) + goto err_out; + + /* update counts and index */ + rxr_remaining--; + rxr_idx++; + } + } + + for (; v_idx < q_vectors; v_idx++) { + int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx); + int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx); + err = ixgbe_alloc_q_vector(adapter, q_vectors, v_idx, + tqpv, txr_idx, + rqpv, rxr_idx); + + if (err) + goto err_out; + + /* update counts and index */ + rxr_remaining -= rqpv; + txr_remaining -= tqpv; + rxr_idx++; + txr_idx++; + } + + return 0; + +err_out: + adapter->num_tx_queues = 0; + adapter->num_rx_queues = 0; + adapter->num_q_vectors = 0; + + while (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 = adapter->num_q_vectors; + + adapter->num_tx_queues = 0; + adapter->num_rx_queues = 0; + adapter->num_q_vectors = 0; + + while (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 void ixgbe_set_interrupt_capability(struct ixgbe_adapter *adapter) +{ + int err; + + /* We will try to get MSI-X interrupts first */ + if (!ixgbe_acquire_msix_vectors(adapter)) + return; + + /* At this point, we do not have MSI-X capabilities. We need to + * reconfigure or disable various features which require MSI-X + * capability. + */ + + /* Disable DCB unless we only have a single traffic class */ + if (netdev_get_num_tc(adapter->netdev) > 1) { + e_dev_warn("Number of DCB TCs exceeds number of available queues. Disabling DCB support.\n"); + netdev_reset_tc(adapter->netdev); + + if (adapter->hw.mac.type == ixgbe_mac_82598EB) + adapter->hw.fc.requested_mode = adapter->last_lfc_mode; + + adapter->flags &= ~IXGBE_FLAG_DCB_ENABLED; + adapter->temp_dcb_cfg.pfc_mode_enable = false; + adapter->dcb_cfg.pfc_mode_enable = false; + } + + adapter->dcb_cfg.num_tcs.pg_tcs = 1; + adapter->dcb_cfg.num_tcs.pfc_tcs = 1; + + /* Disable SR-IOV support */ + e_dev_warn("Disabling SR-IOV support\n"); + ixgbe_disable_sriov(adapter); + + /* Disable RSS */ + e_dev_warn("Disabling RSS support\n"); + adapter->ring_feature[RING_F_RSS].limit = 1; + + /* recalculate number of queues now that many features have been + * changed or disabled. + */ + ixgbe_set_num_queues(adapter); + adapter->num_q_vectors = 1; + + err = pci_enable_msi(adapter->pdev); + if (err) + e_dev_warn("Failed to allocate MSI interrupt, falling back to legacy. Error: %d\n", + err); + else + adapter->flags |= IXGBE_FLAG_MSI_ENABLED; +} + +/** + * 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 */ + ixgbe_set_num_queues(adapter); + + /* Set interrupt mode */ + ixgbe_set_interrupt_capability(adapter); + + 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); + 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); +} + |