diff options
Diffstat (limited to 'drivers/net/chelsio/sge.c')
| -rw-r--r-- | drivers/net/chelsio/sge.c | 2140 |
1 files changed, 0 insertions, 2140 deletions
diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c deleted file mode 100644 index e9a03fffef1..00000000000 --- a/drivers/net/chelsio/sge.c +++ /dev/null @@ -1,2140 +0,0 @@ -/***************************************************************************** - * * - * File: sge.c * - * $Revision: 1.26 $ * - * $Date: 2005/06/21 18:29:48 $ * - * Description: * - * DMA engine. * - * part of the Chelsio 10Gb Ethernet Driver. * - * * - * This program is free software; you can redistribute it and/or modify * - * it under the terms of the GNU General Public License, version 2, as * - * published by the Free Software Foundation. * - * * - * 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., * - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * - * * - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * - * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * - * * - * http://www.chelsio.com * - * * - * Copyright (c) 2003 - 2005 Chelsio Communications, Inc. * - * All rights reserved. * - * * - * Maintainers: maintainers@chelsio.com * - * * - * Authors: Dimitrios Michailidis <dm@chelsio.com> * - * Tina Yang <tainay@chelsio.com> * - * Felix Marti <felix@chelsio.com> * - * Scott Bardone <sbardone@chelsio.com> * - * Kurt Ottaway <kottaway@chelsio.com> * - * Frank DiMambro <frank@chelsio.com> * - * * - * History: * - * * - ****************************************************************************/ - -#include "common.h" - -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/pci.h> -#include <linux/ktime.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/if_vlan.h> -#include <linux/skbuff.h> -#include <linux/init.h> -#include <linux/mm.h> -#include <linux/tcp.h> -#include <linux/ip.h> -#include <linux/in.h> -#include <linux/if_arp.h> -#include <linux/slab.h> -#include <linux/prefetch.h> - -#include "cpl5_cmd.h" -#include "sge.h" -#include "regs.h" -#include "espi.h" - -/* This belongs in if_ether.h */ -#define ETH_P_CPL5 0xf - -#define SGE_CMDQ_N 2 -#define SGE_FREELQ_N 2 -#define SGE_CMDQ0_E_N 1024 -#define SGE_CMDQ1_E_N 128 -#define SGE_FREEL_SIZE 4096 -#define SGE_JUMBO_FREEL_SIZE 512 -#define SGE_FREEL_REFILL_THRESH 16 -#define SGE_RESPQ_E_N 1024 -#define SGE_INTRTIMER_NRES 1000 -#define SGE_RX_SM_BUF_SIZE 1536 -#define SGE_TX_DESC_MAX_PLEN 16384 - -#define SGE_RESPQ_REPLENISH_THRES (SGE_RESPQ_E_N / 4) - -/* - * Period of the TX buffer reclaim timer. This timer does not need to run - * frequently as TX buffers are usually reclaimed by new TX packets. - */ -#define TX_RECLAIM_PERIOD (HZ / 4) - -#define M_CMD_LEN 0x7fffffff -#define V_CMD_LEN(v) (v) -#define G_CMD_LEN(v) ((v) & M_CMD_LEN) -#define V_CMD_GEN1(v) ((v) << 31) -#define V_CMD_GEN2(v) (v) -#define F_CMD_DATAVALID (1 << 1) -#define F_CMD_SOP (1 << 2) -#define V_CMD_EOP(v) ((v) << 3) - -/* - * Command queue, receive buffer list, and response queue descriptors. - */ -#if defined(__BIG_ENDIAN_BITFIELD) -struct cmdQ_e { - u32 addr_lo; - u32 len_gen; - u32 flags; - u32 addr_hi; -}; - -struct freelQ_e { - u32 addr_lo; - u32 len_gen; - u32 gen2; - u32 addr_hi; -}; - -struct respQ_e { - u32 Qsleeping : 4; - u32 Cmdq1CreditReturn : 5; - u32 Cmdq1DmaComplete : 5; - u32 Cmdq0CreditReturn : 5; - u32 Cmdq0DmaComplete : 5; - u32 FreelistQid : 2; - u32 CreditValid : 1; - u32 DataValid : 1; - u32 Offload : 1; - u32 Eop : 1; - u32 Sop : 1; - u32 GenerationBit : 1; - u32 BufferLength; -}; -#elif defined(__LITTLE_ENDIAN_BITFIELD) -struct cmdQ_e { - u32 len_gen; - u32 addr_lo; - u32 addr_hi; - u32 flags; -}; - -struct freelQ_e { - u32 len_gen; - u32 addr_lo; - u32 addr_hi; - u32 gen2; -}; - -struct respQ_e { - u32 BufferLength; - u32 GenerationBit : 1; - u32 Sop : 1; - u32 Eop : 1; - u32 Offload : 1; - u32 DataValid : 1; - u32 CreditValid : 1; - u32 FreelistQid : 2; - u32 Cmdq0DmaComplete : 5; - u32 Cmdq0CreditReturn : 5; - u32 Cmdq1DmaComplete : 5; - u32 Cmdq1CreditReturn : 5; - u32 Qsleeping : 4; -} ; -#endif - -/* - * SW Context Command and Freelist Queue Descriptors - */ -struct cmdQ_ce { - struct sk_buff *skb; - DEFINE_DMA_UNMAP_ADDR(dma_addr); - DEFINE_DMA_UNMAP_LEN(dma_len); -}; - -struct freelQ_ce { - struct sk_buff *skb; - DEFINE_DMA_UNMAP_ADDR(dma_addr); - DEFINE_DMA_UNMAP_LEN(dma_len); -}; - -/* - * SW command, freelist and response rings - */ -struct cmdQ { - unsigned long status; /* HW DMA fetch status */ - unsigned int in_use; /* # of in-use command descriptors */ - unsigned int size; /* # of descriptors */ - unsigned int processed; /* total # of descs HW has processed */ - unsigned int cleaned; /* total # of descs SW has reclaimed */ - unsigned int stop_thres; /* SW TX queue suspend threshold */ - u16 pidx; /* producer index (SW) */ - u16 cidx; /* consumer index (HW) */ - u8 genbit; /* current generation (=valid) bit */ - u8 sop; /* is next entry start of packet? */ - struct cmdQ_e *entries; /* HW command descriptor Q */ - struct cmdQ_ce *centries; /* SW command context descriptor Q */ - dma_addr_t dma_addr; /* DMA addr HW command descriptor Q */ - spinlock_t lock; /* Lock to protect cmdQ enqueuing */ -}; - -struct freelQ { - unsigned int credits; /* # of available RX buffers */ - unsigned int size; /* free list capacity */ - u16 pidx; /* producer index (SW) */ - u16 cidx; /* consumer index (HW) */ - u16 rx_buffer_size; /* Buffer size on this free list */ - u16 dma_offset; /* DMA offset to align IP headers */ - u16 recycleq_idx; /* skb recycle q to use */ - u8 genbit; /* current generation (=valid) bit */ - struct freelQ_e *entries; /* HW freelist descriptor Q */ - struct freelQ_ce *centries; /* SW freelist context descriptor Q */ - dma_addr_t dma_addr; /* DMA addr HW freelist descriptor Q */ -}; - -struct respQ { - unsigned int credits; /* credits to be returned to SGE */ - unsigned int size; /* # of response Q descriptors */ - u16 cidx; /* consumer index (SW) */ - u8 genbit; /* current generation(=valid) bit */ - struct respQ_e *entries; /* HW response descriptor Q */ - dma_addr_t dma_addr; /* DMA addr HW response descriptor Q */ -}; - -/* Bit flags for cmdQ.status */ -enum { - CMDQ_STAT_RUNNING = 1, /* fetch engine is running */ - CMDQ_STAT_LAST_PKT_DB = 2 /* last packet rung the doorbell */ -}; - -/* T204 TX SW scheduler */ - -/* Per T204 TX port */ -struct sched_port { - unsigned int avail; /* available bits - quota */ - unsigned int drain_bits_per_1024ns; /* drain rate */ - unsigned int speed; /* drain rate, mbps */ - unsigned int mtu; /* mtu size */ - struct sk_buff_head skbq; /* pending skbs */ -}; - -/* Per T204 device */ -struct sched { - ktime_t last_updated; /* last time quotas were computed */ - unsigned int max_avail; /* max bits to be sent to any port */ - unsigned int port; /* port index (round robin ports) */ - unsigned int num; /* num skbs in per port queues */ - struct sched_port p[MAX_NPORTS]; - struct tasklet_struct sched_tsk;/* tasklet used to run scheduler */ -}; -static void restart_sched(unsigned long); - - -/* - * Main SGE data structure - * - * Interrupts are handled by a single CPU and it is likely that on a MP system - * the application is migrated to another CPU. In that scenario, we try to - * separate the RX(in irq context) and TX state in order to decrease memory - * contention. - */ -struct sge { - struct adapter *adapter; /* adapter backpointer */ - struct net_device *netdev; /* netdevice backpointer */ - struct freelQ freelQ[SGE_FREELQ_N]; /* buffer free lists */ - struct respQ respQ; /* response Q */ - unsigned long stopped_tx_queues; /* bitmap of suspended Tx queues */ - unsigned int rx_pkt_pad; /* RX padding for L2 packets */ - unsigned int jumbo_fl; /* jumbo freelist Q index */ - unsigned int intrtimer_nres; /* no-resource interrupt timer */ - unsigned int fixed_intrtimer;/* non-adaptive interrupt timer */ - struct timer_list tx_reclaim_timer; /* reclaims TX buffers */ - struct timer_list espibug_timer; - unsigned long espibug_timeout; - struct sk_buff *espibug_skb[MAX_NPORTS]; - u32 sge_control; /* shadow value of sge control reg */ - struct sge_intr_counts stats; - struct sge_port_stats __percpu *port_stats[MAX_NPORTS]; - struct sched *tx_sched; - struct cmdQ cmdQ[SGE_CMDQ_N] ____cacheline_aligned_in_smp; -}; - -static const u8 ch_mac_addr[ETH_ALEN] = { - 0x0, 0x7, 0x43, 0x0, 0x0, 0x0 -}; - -/* - * stop tasklet and free all pending skb's - */ -static void tx_sched_stop(struct sge *sge) -{ - struct sched *s = sge->tx_sched; - int i; - - tasklet_kill(&s->sched_tsk); - - for (i = 0; i < MAX_NPORTS; i++) - __skb_queue_purge(&s->p[s->port].skbq); -} - -/* - * t1_sched_update_parms() is called when the MTU or link speed changes. It - * re-computes scheduler parameters to scope with the change. - */ -unsigned int t1_sched_update_parms(struct sge *sge, unsigned int port, - unsigned int mtu, unsigned int speed) -{ - struct sched *s = sge->tx_sched; - struct sched_port *p = &s->p[port]; - unsigned int max_avail_segs; - - pr_debug("t1_sched_update_params mtu=%d speed=%d\n", mtu, speed); - if (speed) - p->speed = speed; - if (mtu) - p->mtu = mtu; - - if (speed || mtu) { - unsigned long long drain = 1024ULL * p->speed * (p->mtu - 40); - do_div(drain, (p->mtu + 50) * 1000); - p->drain_bits_per_1024ns = (unsigned int) drain; - - if (p->speed < 1000) - p->drain_bits_per_1024ns = - 90 * p->drain_bits_per_1024ns / 100; - } - - if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) { - p->drain_bits_per_1024ns -= 16; - s->max_avail = max(4096U, p->mtu + 16 + 14 + 4); - max_avail_segs = max(1U, 4096 / (p->mtu - 40)); - } else { - s->max_avail = 16384; - max_avail_segs = max(1U, 9000 / (p->mtu - 40)); - } - - pr_debug("t1_sched_update_parms: mtu %u speed %u max_avail %u " - "max_avail_segs %u drain_bits_per_1024ns %u\n", p->mtu, - p->speed, s->max_avail, max_avail_segs, - p->drain_bits_per_1024ns); - - return max_avail_segs * (p->mtu - 40); -} - -#if 0 - -/* - * t1_sched_max_avail_bytes() tells the scheduler the maximum amount of - * data that can be pushed per port. - */ -void t1_sched_set_max_avail_bytes(struct sge *sge, unsigned int val) -{ - struct sched *s = sge->tx_sched; - unsigned int i; - - s->max_avail = val; - for (i = 0; i < MAX_NPORTS; i++) - t1_sched_update_parms(sge, i, 0, 0); -} - -/* - * t1_sched_set_drain_bits_per_us() tells the scheduler at which rate a port - * is draining. - */ -void t1_sched_set_drain_bits_per_us(struct sge *sge, unsigned int port, - unsigned int val) -{ - struct sched *s = sge->tx_sched; - struct sched_port *p = &s->p[port]; - p->drain_bits_per_1024ns = val * 1024 / 1000; - t1_sched_update_parms(sge, port, 0, 0); -} - -#endif /* 0 */ - - -/* - * get_clock() implements a ns clock (see ktime_get) - */ -static inline ktime_t get_clock(void) -{ - struct timespec ts; - - ktime_get_ts(&ts); - return timespec_to_ktime(ts); -} - -/* - * tx_sched_init() allocates resources and does basic initialization. - */ -static int tx_sched_init(struct sge *sge) -{ - struct sched *s; - int i; - - s = kzalloc(sizeof (struct sched), GFP_KERNEL); - if (!s) - return -ENOMEM; - - pr_debug("tx_sched_init\n"); - tasklet_init(&s->sched_tsk, restart_sched, (unsigned long) sge); - sge->tx_sched = s; - - for (i = 0; i < MAX_NPORTS; i++) { - skb_queue_head_init(&s->p[i].skbq); - t1_sched_update_parms(sge, i, 1500, 1000); - } - - return 0; -} - -/* - * sched_update_avail() computes the delta since the last time it was called - * and updates the per port quota (number of bits that can be sent to the any - * port). - */ -static inline int sched_update_avail(struct sge *sge) -{ - struct sched *s = sge->tx_sched; - ktime_t now = get_clock(); - unsigned int i; - long long delta_time_ns; - - delta_time_ns = ktime_to_ns(ktime_sub(now, s->last_updated)); - - pr_debug("sched_update_avail delta=%lld\n", delta_time_ns); - if (delta_time_ns < 15000) - return 0; - - for (i = 0; i < MAX_NPORTS; i++) { - struct sched_port *p = &s->p[i]; - unsigned int delta_avail; - - delta_avail = (p->drain_bits_per_1024ns * delta_time_ns) >> 13; - p->avail = min(p->avail + delta_avail, s->max_avail); - } - - s->last_updated = now; - - return 1; -} - -/* - * sched_skb() is called from two different places. In the tx path, any - * packet generating load on an output port will call sched_skb() - * (skb != NULL). In addition, sched_skb() is called from the irq/soft irq - * context (skb == NULL). - * The scheduler only returns a skb (which will then be sent) if the - * length of the skb is <= the current quota of the output port. - */ -static struct sk_buff *sched_skb(struct sge *sge, struct sk_buff *skb, - unsigned int credits) -{ - struct sched *s = sge->tx_sched; - struct sk_buff_head *skbq; - unsigned int i, len, update = 1; - - pr_debug("sched_skb %p\n", skb); - if (!skb) { - if (!s->num) - return NULL; - } else { - skbq = &s->p[skb->dev->if_port].skbq; - __skb_queue_tail(skbq, skb); - s->num++; - skb = NULL; - } - - if (credits < MAX_SKB_FRAGS + 1) - goto out; - -again: - for (i = 0; i < MAX_NPORTS; i++) { - s->port = (s->port + 1) & (MAX_NPORTS - 1); - skbq = &s->p[s->port].skbq; - - skb = skb_peek(skbq); - - if (!skb) - continue; - - len = skb->len; - if (len <= s->p[s->port].avail) { - s->p[s->port].avail -= len; - s->num--; - __skb_unlink(skb, skbq); - goto out; - } - skb = NULL; - } - - if (update-- && sched_update_avail(sge)) - goto again; - -out: - /* If there are more pending skbs, we use the hardware to schedule us - * again. - */ - if (s->num && !skb) { - struct cmdQ *q = &sge->cmdQ[0]; - clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { - set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); - } - } - pr_debug("sched_skb ret %p\n", skb); - - return skb; -} - -/* - * PIO to indicate that memory mapped Q contains valid descriptor(s). - */ -static inline void doorbell_pio(struct adapter *adapter, u32 val) -{ - wmb(); - writel(val, adapter->regs + A_SG_DOORBELL); -} - -/* - * Frees all RX buffers on the freelist Q. The caller must make sure that - * the SGE is turned off before calling this function. - */ -static void free_freelQ_buffers(struct pci_dev *pdev, struct freelQ *q) -{ - unsigned int cidx = q->cidx; - - while (q->credits--) { - struct freelQ_ce *ce = &q->centries[cidx]; - - pci_unmap_single(pdev, dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), - PCI_DMA_FROMDEVICE); - dev_kfree_skb(ce->skb); - ce->skb = NULL; - if (++cidx == q->size) - cidx = 0; - } -} - -/* - * Free RX free list and response queue resources. - */ -static void free_rx_resources(struct sge *sge) -{ - struct pci_dev *pdev = sge->adapter->pdev; - unsigned int size, i; - - if (sge->respQ.entries) { - size = sizeof(struct respQ_e) * sge->respQ.size; - pci_free_consistent(pdev, size, sge->respQ.entries, - sge->respQ.dma_addr); - } - - for (i = 0; i < SGE_FREELQ_N; i++) { - struct freelQ *q = &sge->freelQ[i]; - - if (q->centries) { - free_freelQ_buffers(pdev, q); - kfree(q->centries); - } - if (q->entries) { - size = sizeof(struct freelQ_e) * q->size; - pci_free_consistent(pdev, size, q->entries, - q->dma_addr); - } - } -} - -/* - * Allocates basic RX resources, consisting of memory mapped freelist Qs and a - * response queue. - */ -static int alloc_rx_resources(struct sge *sge, struct sge_params *p) -{ - struct pci_dev *pdev = sge->adapter->pdev; - unsigned int size, i; - - for (i = 0; i < SGE_FREELQ_N; i++) { - struct freelQ *q = &sge->freelQ[i]; - - q->genbit = 1; - q->size = p->freelQ_size[i]; - q->dma_offset = sge->rx_pkt_pad ? 0 : NET_IP_ALIGN; - size = sizeof(struct freelQ_e) * q->size; - q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); - if (!q->entries) - goto err_no_mem; - - size = sizeof(struct freelQ_ce) * q->size; - q->centries = kzalloc(size, GFP_KERNEL); - if (!q->centries) - goto err_no_mem; - } - - /* - * Calculate the buffer sizes for the two free lists. FL0 accommodates - * regular sized Ethernet frames, FL1 is sized not to exceed 16K, - * including all the sk_buff overhead. - * - * Note: For T2 FL0 and FL1 are reversed. - */ - sge->freelQ[!sge->jumbo_fl].rx_buffer_size = SGE_RX_SM_BUF_SIZE + - sizeof(struct cpl_rx_data) + - sge->freelQ[!sge->jumbo_fl].dma_offset; - - size = (16 * 1024) - - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); - - sge->freelQ[sge->jumbo_fl].rx_buffer_size = size; - - /* - * Setup which skb recycle Q should be used when recycling buffers from - * each free list. - */ - sge->freelQ[!sge->jumbo_fl].recycleq_idx = 0; - sge->freelQ[sge->jumbo_fl].recycleq_idx = 1; - - sge->respQ.genbit = 1; - sge->respQ.size = SGE_RESPQ_E_N; - sge->respQ.credits = 0; - size = sizeof(struct respQ_e) * sge->respQ.size; - sge->respQ.entries = - pci_alloc_consistent(pdev, size, &sge->respQ.dma_addr); - if (!sge->respQ.entries) - goto err_no_mem; - return 0; - -err_no_mem: - free_rx_resources(sge); - return -ENOMEM; -} - -/* - * Reclaims n TX descriptors and frees the buffers associated with them. - */ -static void free_cmdQ_buffers(struct sge *sge, struct cmdQ *q, unsigned int n) -{ - struct cmdQ_ce *ce; - struct pci_dev *pdev = sge->adapter->pdev; - unsigned int cidx = q->cidx; - - q->in_use -= n; - ce = &q->centries[cidx]; - while (n--) { - if (likely(dma_unmap_len(ce, dma_len))) { - pci_unmap_single(pdev, dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), - PCI_DMA_TODEVICE); - if (q->sop) - q->sop = 0; - } - if (ce->skb) { - dev_kfree_skb_any(ce->skb); - q->sop = 1; - } - ce++; - if (++cidx == q->size) { - cidx = 0; - ce = q->centries; - } - } - q->cidx = cidx; -} - -/* - * Free TX resources. - * - * Assumes that SGE is stopped and all interrupts are disabled. - */ -static void free_tx_resources(struct sge *sge) -{ - struct pci_dev *pdev = sge->adapter->pdev; - unsigned int size, i; - - for (i = 0; i < SGE_CMDQ_N; i++) { - struct cmdQ *q = &sge->cmdQ[i]; - - if (q->centries) { - if (q->in_use) - free_cmdQ_buffers(sge, q, q->in_use); - kfree(q->centries); - } - if (q->entries) { - size = sizeof(struct cmdQ_e) * q->size; - pci_free_consistent(pdev, size, q->entries, - q->dma_addr); - } - } -} - -/* - * Allocates basic TX resources, consisting of memory mapped command Qs. - */ -static int alloc_tx_resources(struct sge *sge, struct sge_params *p) -{ - struct pci_dev *pdev = sge->adapter->pdev; - unsigned int size, i; - - for (i = 0; i < SGE_CMDQ_N; i++) { - struct cmdQ *q = &sge->cmdQ[i]; - - q->genbit = 1; - q->sop = 1; - q->size = p->cmdQ_size[i]; - q->in_use = 0; - q->status = 0; - q->processed = q->cleaned = 0; - q->stop_thres = 0; - spin_lock_init(&q->lock); - size = sizeof(struct cmdQ_e) * q->size; - q->entries = pci_alloc_consistent(pdev, size, &q->dma_addr); - if (!q->entries) - goto err_no_mem; - - size = sizeof(struct cmdQ_ce) * q->size; - q->centries = kzalloc(size, GFP_KERNEL); - if (!q->centries) - goto err_no_mem; - } - - /* - * CommandQ 0 handles Ethernet and TOE packets, while queue 1 is TOE - * only. For queue 0 set the stop threshold so we can handle one more - * packet from each port, plus reserve an additional 24 entries for - * Ethernet packets only. Queue 1 never suspends nor do we reserve - * space for Ethernet packets. - */ - sge->cmdQ[0].stop_thres = sge->adapter->params.nports * - (MAX_SKB_FRAGS + 1); - return 0; - -err_no_mem: - free_tx_resources(sge); - return -ENOMEM; -} - -static inline void setup_ring_params(struct adapter *adapter, u64 addr, - u32 size, int base_reg_lo, - int base_reg_hi, int size_reg) -{ - writel((u32)addr, adapter->regs + base_reg_lo); - writel(addr >> 32, adapter->regs + base_reg_hi); - writel(size, adapter->regs + size_reg); -} - -/* - * Enable/disable VLAN acceleration. - */ -void t1_vlan_mode(struct adapter *adapter, u32 features) -{ - struct sge *sge = adapter->sge; - - if (features & NETIF_F_HW_VLAN_RX) - sge->sge_control |= F_VLAN_XTRACT; - else - sge->sge_control &= ~F_VLAN_XTRACT; - if (adapter->open_device_map) { - writel(sge->sge_control, adapter->regs + A_SG_CONTROL); - readl(adapter->regs + A_SG_CONTROL); /* flush */ - } -} - -/* - * Programs the various SGE registers. However, the engine is not yet enabled, - * but sge->sge_control is setup and ready to go. - */ -static void configure_sge(struct sge *sge, struct sge_params *p) -{ - struct adapter *ap = sge->adapter; - - writel(0, ap->regs + A_SG_CONTROL); - setup_ring_params(ap, sge->cmdQ[0].dma_addr, sge->cmdQ[0].size, - A_SG_CMD0BASELWR, A_SG_CMD0BASEUPR, A_SG_CMD0SIZE); - setup_ring_params(ap, sge->cmdQ[1].dma_addr, sge->cmdQ[1].size, - A_SG_CMD1BASELWR, A_SG_CMD1BASEUPR, A_SG_CMD1SIZE); - setup_ring_params(ap, sge->freelQ[0].dma_addr, - sge->freelQ[0].size, A_SG_FL0BASELWR, - A_SG_FL0BASEUPR, A_SG_FL0SIZE); - setup_ring_params(ap, sge->freelQ[1].dma_addr, - sge->freelQ[1].size, A_SG_FL1BASELWR, - A_SG_FL1BASEUPR, A_SG_FL1SIZE); - - /* The threshold comparison uses <. */ - writel(SGE_RX_SM_BUF_SIZE + 1, ap->regs + A_SG_FLTHRESHOLD); - - setup_ring_params(ap, sge->respQ.dma_addr, sge->respQ.size, - A_SG_RSPBASELWR, A_SG_RSPBASEUPR, A_SG_RSPSIZE); - writel((u32)sge->respQ.size - 1, ap->regs + A_SG_RSPQUEUECREDIT); - - sge->sge_control = F_CMDQ0_ENABLE | F_CMDQ1_ENABLE | F_FL0_ENABLE | - F_FL1_ENABLE | F_CPL_ENABLE | F_RESPONSE_QUEUE_ENABLE | - V_CMDQ_PRIORITY(2) | F_DISABLE_CMDQ1_GTS | F_ISCSI_COALESCE | - V_RX_PKT_OFFSET(sge->rx_pkt_pad); - -#if defined(__BIG_ENDIAN_BITFIELD) - sge->sge_control |= F_ENABLE_BIG_ENDIAN; -#endif - - /* Initialize no-resource timer */ - sge->intrtimer_nres = SGE_INTRTIMER_NRES * core_ticks_per_usec(ap); - - t1_sge_set_coalesce_params(sge, p); -} - -/* - * Return the payload capacity of the jumbo free-list buffers. - */ -static inline unsigned int jumbo_payload_capacity(const struct sge *sge) -{ - return sge->freelQ[sge->jumbo_fl].rx_buffer_size - - sge->freelQ[sge->jumbo_fl].dma_offset - - sizeof(struct cpl_rx_data); -} - -/* - * Frees all SGE related resources and the sge structure itself - */ -void t1_sge_destroy(struct sge *sge) -{ - int i; - - for_each_port(sge->adapter, i) - free_percpu(sge->port_stats[i]); - - kfree(sge->tx_sched); - free_tx_resources(sge); - free_rx_resources(sge); - kfree(sge); -} - -/* - * Allocates new RX buffers on the freelist Q (and tracks them on the freelist - * context Q) until the Q is full or alloc_skb fails. - * - * It is possible that the generation bits already match, indicating that the - * buffer is already valid and nothing needs to be done. This happens when we - * copied a received buffer into a new sk_buff during the interrupt processing. - * - * If the SGE doesn't automatically align packets properly (!sge->rx_pkt_pad), - * we specify a RX_OFFSET in order to make sure that the IP header is 4B - * aligned. - */ -static void refill_free_list(struct sge *sge, struct freelQ *q) -{ - struct pci_dev *pdev = sge->adapter->pdev; - struct freelQ_ce *ce = &q->centries[q->pidx]; - struct freelQ_e *e = &q->entries[q->pidx]; - unsigned int dma_len = q->rx_buffer_size - q->dma_offset; - - while (q->credits < q->size) { - struct sk_buff *skb; - dma_addr_t mapping; - - skb = alloc_skb(q->rx_buffer_size, GFP_ATOMIC); - if (!skb) - break; - - skb_reserve(skb, q->dma_offset); - mapping = pci_map_single(pdev, skb->data, dma_len, - PCI_DMA_FROMDEVICE); - skb_reserve(skb, sge->rx_pkt_pad); - - ce->skb = skb; - dma_unmap_addr_set(ce, dma_addr, mapping); - dma_unmap_len_set(ce, dma_len, dma_len); - e->addr_lo = (u32)mapping; - e->addr_hi = (u64)mapping >> 32; - e->len_gen = V_CMD_LEN(dma_len) | V_CMD_GEN1(q->genbit); - wmb(); - e->gen2 = V_CMD_GEN2(q->genbit); - - e++; - ce++; - if (++q->pidx == q->size) { - q->pidx = 0; - q->genbit ^= 1; - ce = q->centries; - e = q->entries; - } - q->credits++; - } -} - -/* - * Calls refill_free_list for both free lists. If we cannot fill at least 1/4 - * of both rings, we go into 'few interrupt mode' in order to give the system - * time to free up resources. - */ -static void freelQs_empty(struct sge *sge) -{ - struct adapter *adapter = sge->adapter; - u32 irq_reg = readl(adapter->regs + A_SG_INT_ENABLE); - u32 irqholdoff_reg; - - refill_free_list(sge, &sge->freelQ[0]); - refill_free_list(sge, &sge->freelQ[1]); - - if (sge->freelQ[0].credits > (sge->freelQ[0].size >> 2) && - sge->freelQ[1].credits > (sge->freelQ[1].size >> 2)) { - irq_reg |= F_FL_EXHAUSTED; - irqholdoff_reg = sge->fixed_intrtimer; - } else { - /* Clear the F_FL_EXHAUSTED interrupts for now */ - irq_reg &= ~F_FL_EXHAUSTED; - irqholdoff_reg = sge->intrtimer_nres; - } - writel(irqholdoff_reg, adapter->regs + A_SG_INTRTIMER); - writel(irq_reg, adapter->regs + A_SG_INT_ENABLE); - - /* We reenable the Qs to force a freelist GTS interrupt later */ - doorbell_pio(adapter, F_FL0_ENABLE | F_FL1_ENABLE); -} - -#define SGE_PL_INTR_MASK (F_PL_INTR_SGE_ERR | F_PL_INTR_SGE_DATA) -#define SGE_INT_FATAL (F_RESPQ_OVERFLOW | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) -#define SGE_INT_ENABLE (F_RESPQ_EXHAUSTED | F_RESPQ_OVERFLOW | \ - F_FL_EXHAUSTED | F_PACKET_TOO_BIG | F_PACKET_MISMATCH) - -/* - * Disable SGE Interrupts - */ -void t1_sge_intr_disable(struct sge *sge) -{ - u32 val = readl(sge->adapter->regs + A_PL_ENABLE); - - writel(val & ~SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); - writel(0, sge->adapter->regs + A_SG_INT_ENABLE); -} - -/* - * Enable SGE interrupts. - */ -void t1_sge_intr_enable(struct sge *sge) -{ - u32 en = SGE_INT_ENABLE; - u32 val = readl(sge->adapter->regs + A_PL_ENABLE); - - if (sge->adapter->port[0].dev->hw_features & NETIF_F_TSO) - en &= ~F_PACKET_TOO_BIG; - writel(en, sge->adapter->regs + A_SG_INT_ENABLE); - writel(val | SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_ENABLE); -} - -/* - * Clear SGE interrupts. - */ -void t1_sge_intr_clear(struct sge *sge) -{ - writel(SGE_PL_INTR_MASK, sge->adapter->regs + A_PL_CAUSE); - writel(0xffffffff, sge->adapter->regs + A_SG_INT_CAUSE); -} - -/* - * SGE 'Error' interrupt handler - */ -int t1_sge_intr_error_handler(struct sge *sge) -{ - struct adapter *adapter = sge->adapter; - u32 cause = readl(adapter->regs + A_SG_INT_CAUSE); - - if (adapter->port[0].dev->hw_features & NETIF_F_TSO) - cause &= ~F_PACKET_TOO_BIG; - if (cause & F_RESPQ_EXHAUSTED) - sge->stats.respQ_empty++; - if (cause & F_RESPQ_OVERFLOW) { - sge->stats.respQ_overflow++; - pr_alert("%s: SGE response queue overflow\n", - adapter->name); - } - if (cause & F_FL_EXHAUSTED) { - sge->stats.freelistQ_empty++; - freelQs_empty(sge); - } - if (cause & F_PACKET_TOO_BIG) { - sge->stats.pkt_too_big++; - pr_alert("%s: SGE max packet size exceeded\n", - adapter->name); - } - if (cause & F_PACKET_MISMATCH) { - sge->stats.pkt_mismatch++; - pr_alert("%s: SGE packet mismatch\n", adapter->name); - } - if (cause & SGE_INT_FATAL) - t1_fatal_err(adapter); - - writel(cause, adapter->regs + A_SG_INT_CAUSE); - return 0; -} - -const struct sge_intr_counts *t1_sge_get_intr_counts(const struct sge *sge) -{ - return &sge->stats; -} - -void t1_sge_get_port_stats(const struct sge *sge, int port, - struct sge_port_stats *ss) -{ - int cpu; - - memset(ss, 0, sizeof(*ss)); - for_each_possible_cpu(cpu) { - struct sge_port_stats *st = per_cpu_ptr(sge->port_stats[port], cpu); - - ss->rx_cso_good += st->rx_cso_good; - ss->tx_cso += st->tx_cso; - ss->tx_tso += st->tx_tso; - ss->tx_need_hdrroom += st->tx_need_hdrroom; - ss->vlan_xtract += st->vlan_xtract; - ss->vlan_insert += st->vlan_insert; - } -} - -/** - * recycle_fl_buf - recycle a free list buffer - * @fl: the free list - * @idx: index of buffer to recycle - * - * Recycles the specified buffer on the given free list by adding it at - * the next available slot on the list. - */ -static void recycle_fl_buf(struct freelQ *fl, int idx) -{ - struct freelQ_e *from = &fl->entries[idx]; - struct freelQ_e *to = &fl->entries[fl->pidx]; - - fl->centries[fl->pidx] = fl->centries[idx]; - to->addr_lo = from->addr_lo; - to->addr_hi = from->addr_hi; - to->len_gen = G_CMD_LEN(from->len_gen) | V_CMD_GEN1(fl->genbit); - wmb(); - to->gen2 = V_CMD_GEN2(fl->genbit); - fl->credits++; - - if (++fl->pidx == fl->size) { - fl->pidx = 0; - fl->genbit ^= 1; - } -} - -static int copybreak __read_mostly = 256; -module_param(copybreak, int, 0); -MODULE_PARM_DESC(copybreak, "Receive copy threshold"); - -/** - * get_packet - return the next ingress packet buffer - * @pdev: the PCI device that received the packet - * @fl: the SGE free list holding the packet - * @len: the actual packet length, excluding any SGE padding - * - * Get the next packet from a free list and complete setup of the - * sk_buff. If the packet is small we make a copy and recycle the - * original buffer, otherwise we use the original buffer itself. If a - * positive drop threshold is supplied packets are dropped and their - * buffers recycled if (a) the number of remaining buffers is under the - * threshold and the packet is too big to copy, or (b) the packet should - * be copied but there is no memory for the copy. - */ -static inline struct sk_buff *get_packet(struct pci_dev *pdev, - struct freelQ *fl, unsigned int len) -{ - struct sk_buff *skb; - const struct freelQ_ce *ce = &fl->centries[fl->cidx]; - - if (len < copybreak) { - skb = alloc_skb(len + 2, GFP_ATOMIC); - if (!skb) - goto use_orig_buf; - - skb_reserve(skb, 2); /* align IP header */ - skb_put(skb, len); - pci_dma_sync_single_for_cpu(pdev, - dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), - PCI_DMA_FROMDEVICE); - skb_copy_from_linear_data(ce->skb, skb->data, len); - pci_dma_sync_single_for_device(pdev, - dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), - PCI_DMA_FROMDEVICE); - recycle_fl_buf(fl, fl->cidx); - return skb; - } - -use_orig_buf: - if (fl->credits < 2) { - recycle_fl_buf(fl, fl->cidx); - return NULL; - } - - pci_unmap_single(pdev, dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); - skb = ce->skb; - prefetch(skb->data); - - skb_put(skb, len); - return skb; -} - -/** - * unexpected_offload - handle an unexpected offload packet - * @adapter: the adapter - * @fl: the free list that received the packet - * - * Called when we receive an unexpected offload packet (e.g., the TOE - * function is disabled or the card is a NIC). Prints a message and - * recycles the buffer. - */ -static void unexpected_offload(struct adapter *adapter, struct freelQ *fl) -{ - struct freelQ_ce *ce = &fl->centries[fl->cidx]; - struct sk_buff *skb = ce->skb; - - pci_dma_sync_single_for_cpu(adapter->pdev, dma_unmap_addr(ce, dma_addr), - dma_unmap_len(ce, dma_len), PCI_DMA_FROMDEVICE); - pr_err("%s: unexpected offload packet, cmd %u\n", - adapter->name, *skb->data); - recycle_fl_buf(fl, fl->cidx); -} - -/* - * T1/T2 SGE limits the maximum DMA size per TX descriptor to - * SGE_TX_DESC_MAX_PLEN (16KB). If the PAGE_SIZE is larger than 16KB, the - * stack might send more than SGE_TX_DESC_MAX_PLEN in a contiguous manner. - * Note that the *_large_page_tx_descs stuff will be optimized out when - * PAGE_SIZE <= SGE_TX_DESC_MAX_PLEN. - * - * compute_large_page_descs() computes how many additional descriptors are - * required to break down the stack's request. - */ -static inline unsigned int compute_large_page_tx_descs(struct sk_buff *skb) -{ - unsigned int count = 0; - - if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { - unsigned int nfrags = skb_shinfo(skb)->nr_frags; - unsigned int i, len = skb_headlen(skb); - while (len > SGE_TX_DESC_MAX_PLEN) { - count++; - len -= SGE_TX_DESC_MAX_PLEN; - } - for (i = 0; nfrags--; i++) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - len = frag->size; - while (len > SGE_TX_DESC_MAX_PLEN) { - count++; - len -= SGE_TX_DESC_MAX_PLEN; - } - } - } - return count; -} - -/* - * Write a cmdQ entry. - * - * Since this function writes the 'flags' field, it must not be used to - * write the first cmdQ entry. - */ -static inline void write_tx_desc(struct cmdQ_e *e, dma_addr_t mapping, - unsigned int len, unsigned int gen, - unsigned int eop) -{ - BUG_ON(len > SGE_TX_DESC_MAX_PLEN); - - e->addr_lo = (u32)mapping; - e->addr_hi = (u64)mapping >> 32; - e->len_gen = V_CMD_LEN(len) | V_CMD_GEN1(gen); - e->flags = F_CMD_DATAVALID | V_CMD_EOP(eop) | V_CMD_GEN2(gen); -} - -/* - * See comment for previous function. - * - * write_tx_descs_large_page() writes additional SGE tx descriptors if - * *desc_len exceeds HW's capability. - */ -static inline unsigned int write_large_page_tx_descs(unsigned int pidx, - struct cmdQ_e **e, - struct cmdQ_ce **ce, - unsigned int *gen, - dma_addr_t *desc_mapping, - unsigned int *desc_len, - unsigned int nfrags, - struct cmdQ *q) -{ - if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN) { - struct cmdQ_e *e1 = *e; - struct cmdQ_ce *ce1 = *ce; - - while (*desc_len > SGE_TX_DESC_MAX_PLEN) { - *desc_len -= SGE_TX_DESC_MAX_PLEN; - write_tx_desc(e1, *desc_mapping, SGE_TX_DESC_MAX_PLEN, - *gen, nfrags == 0 && *desc_len == 0); - ce1->skb = NULL; - dma_unmap_len_set(ce1, dma_len, 0); - *desc_mapping += SGE_TX_DESC_MAX_PLEN; - if (*desc_len) { - ce1++; - e1++; - if (++pidx == q->size) { - pidx = 0; - *gen ^= 1; - ce1 = q->centries; - e1 = q->entries; - } - } - } - *e = e1; - *ce = ce1; - } - return pidx; -} - -/* - * Write the command descriptors to transmit the given skb starting at - * descriptor pidx with the given generation. - */ -static inline void write_tx_descs(struct adapter *adapter, struct sk_buff *skb, - unsigned int pidx, unsigned int gen, - struct cmdQ *q) -{ - dma_addr_t mapping, desc_mapping; - struct cmdQ_e *e, *e1; - struct cmdQ_ce *ce; - unsigned int i, flags, first_desc_len, desc_len, - nfrags = skb_shinfo(skb)->nr_frags; - - e = e1 = &q->entries[pidx]; - ce = &q->centries[pidx]; - - mapping = pci_map_single(adapter->pdev, skb->data, - skb_headlen(skb), PCI_DMA_TODEVICE); - - desc_mapping = mapping; - desc_len = skb_headlen(skb); - - flags = F_CMD_DATAVALID | F_CMD_SOP | - V_CMD_EOP(nfrags == 0 && desc_len <= SGE_TX_DESC_MAX_PLEN) | - V_CMD_GEN2(gen); - first_desc_len = (desc_len <= SGE_TX_DESC_MAX_PLEN) ? - desc_len : SGE_TX_DESC_MAX_PLEN; - e->addr_lo = (u32)desc_mapping; - e->addr_hi = (u64)desc_mapping >> 32; - e->len_gen = V_CMD_LEN(first_desc_len) | V_CMD_GEN1(gen); - ce->skb = NULL; - dma_unmap_len_set(ce, dma_len, 0); - - if (PAGE_SIZE > SGE_TX_DESC_MAX_PLEN && - desc_len > SGE_TX_DESC_MAX_PLEN) { - desc_mapping += first_desc_len; - desc_len -= first_desc_len; - e1++; - ce++; - if (++pidx == q->size) { - pidx = 0; - gen ^= 1; - e1 = q->entries; - ce = q->centries; - } - pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, - &desc_mapping, &desc_len, - nfrags, q); - - if (likely(desc_len)) - write_tx_desc(e1, desc_mapping, desc_len, gen, - nfrags == 0); - } - - ce->skb = NULL; - dma_unmap_addr_set(ce, dma_addr, mapping); - dma_unmap_len_set(ce, dma_len, skb_headlen(skb)); - - for (i = 0; nfrags--; i++) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - e1++; - ce++; - if (++pidx == q->size) { - pidx = 0; - gen ^= 1; - e1 = q->entries; - ce = q->centries; - } - - mapping = pci_map_page(adapter->pdev, frag->page, - frag->page_offset, frag->size, - PCI_DMA_TODEVICE); - desc_mapping = mapping; - desc_len = frag->size; - - pidx = write_large_page_tx_descs(pidx, &e1, &ce, &gen, - &desc_mapping, &desc_len, - nfrags, q); - if (likely(desc_len)) - write_tx_desc(e1, desc_mapping, desc_len, gen, - nfrags == 0); - ce->skb = NULL; - dma_unmap_addr_set(ce, dma_addr, mapping); - dma_unmap_len_set(ce, dma_len, frag->size); - } - ce->skb = skb; - wmb(); - e->flags = flags; -} - -/* - * Clean up completed Tx buffers. - */ -static inline void reclaim_completed_tx(struct sge *sge, struct cmdQ *q) -{ - unsigned int reclaim = q->processed - q->cleaned; - - if (reclaim) { - pr_debug("reclaim_completed_tx processed:%d cleaned:%d\n", - q->processed, q->cleaned); - free_cmdQ_buffers(sge, q, reclaim); - q->cleaned += reclaim; - } -} - -/* - * Called from tasklet. Checks the scheduler for any - * pending skbs that can be sent. - */ -static void restart_sched(unsigned long arg) -{ - struct sge *sge = (struct sge *) arg; - struct adapter *adapter = sge->adapter; - struct cmdQ *q = &sge->cmdQ[0]; - struct sk_buff *skb; - unsigned int credits, queued_skb = 0; - - spin_lock(&q->lock); - reclaim_completed_tx(sge, q); - - credits = q->size - q->in_use; - pr_debug("restart_sched credits=%d\n", credits); - while ((skb = sched_skb(sge, NULL, credits)) != NULL) { - unsigned int genbit, pidx, count; - count = 1 + skb_shinfo(skb)->nr_frags; - count += compute_large_page_tx_descs(skb); - q->in_use += count; - genbit = q->genbit; - pidx = q->pidx; - q->pidx += count; - if (q->pidx >= q->size) { - q->pidx -= q->size; - q->genbit ^= 1; - } - write_tx_descs(adapter, skb, pidx, genbit, q); - credits = q->size - q->in_use; - queued_skb = 1; - } - - if (queued_skb) { - clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { - set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); - } - } - spin_unlock(&q->lock); -} - -/** - * sge_rx - process an ingress ethernet packet - * @sge: the sge structure - * @fl: the free list that contains the packet buffer - * @len: the packet length - * - * Process an ingress ethernet pakcet and deliver it to the stack. - */ -static void sge_rx(struct sge *sge, struct freelQ *fl, unsigned int len) -{ - struct sk_buff *skb; - const struct cpl_rx_pkt *p; - struct adapter *adapter = sge->adapter; - struct sge_port_stats *st; - struct net_device *dev; - - skb = get_packet(adapter->pdev, fl, len - sge->rx_pkt_pad); - if (unlikely(!skb)) { - sge->stats.rx_drops++; - return; - } - - p = (const struct cpl_rx_pkt *) skb->data; - if (p->iff >= adapter->params.nports) { - kfree_skb(skb); - return; - } - __skb_pull(skb, sizeof(*p)); - - st = this_cpu_ptr(sge->port_stats[p->iff]); - dev = adapter->port[p->iff].dev; - - skb->protocol = eth_type_trans(skb, dev); - if ((dev->features & NETIF_F_RXCSUM) && p->csum == 0xffff && - skb->protocol == htons(ETH_P_IP) && - (skb->data[9] == IPPROTO_TCP || skb->data[9] == IPPROTO_UDP)) { - ++st->rx_cso_good; - skb->ip_summed = CHECKSUM_UNNECESSARY; - } else - skb_checksum_none_assert(skb); - - if (p->vlan_valid) { - st->vlan_xtract++; - __vlan_hwaccel_put_tag(skb, ntohs(p->vlan)); - } - netif_receive_skb(skb); -} - -/* - * Returns true if a command queue has enough available descriptors that - * we can resume Tx operation after temporarily disabling its packet queue. - */ -static inline int enough_free_Tx_descs(const struct cmdQ *q) -{ - unsigned int r = q->processed - q->cleaned; - - return q->in_use - r < (q->size >> 1); -} - -/* - * Called when sufficient space has become available in the SGE command queues - * after the Tx packet schedulers have been suspended to restart the Tx path. - */ -static void restart_tx_queues(struct sge *sge) -{ - struct adapter *adap = sge->adapter; - int i; - - if (!enough_free_Tx_descs(&sge->cmdQ[0])) - return; - - for_each_port(adap, i) { - struct net_device *nd = adap->port[i].dev; - - if (test_and_clear_bit(nd->if_port, &sge->stopped_tx_queues) && - netif_running(nd)) { - sge->stats.cmdQ_restarted[2]++; - netif_wake_queue(nd); - } - } -} - -/* - * update_tx_info is called from the interrupt handler/NAPI to return cmdQ0 - * information. - */ -static unsigned int update_tx_info(struct adapter *adapter, - unsigned int flags, - unsigned int pr0) -{ - struct sge *sge = adapter->sge; - struct cmdQ *cmdq = &sge->cmdQ[0]; - - cmdq->processed += pr0; - if (flags & (F_FL0_ENABLE | F_FL1_ENABLE)) { - freelQs_empty(sge); - flags &= ~(F_FL0_ENABLE | F_FL1_ENABLE); - } - if (flags & F_CMDQ0_ENABLE) { - clear_bit(CMDQ_STAT_RUNNING, &cmdq->status); - - if (cmdq->cleaned + cmdq->in_use != cmdq->processed && - !test_and_set_bit(CMDQ_STAT_LAST_PKT_DB, &cmdq->status)) { - set_bit(CMDQ_STAT_RUNNING, &cmdq->status); - writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); - } - if (sge->tx_sched) - tasklet_hi_schedule(&sge->tx_sched->sched_tsk); - - flags &= ~F_CMDQ0_ENABLE; - } - - if (unlikely(sge->stopped_tx_queues != 0)) - restart_tx_queues(sge); - - return flags; -} - -/* - * Process SGE responses, up to the supplied budget. Returns the number of - * responses processed. A negative budget is effectively unlimited. - */ -static int process_responses(struct adapter *adapter, int budget) -{ - struct sge *sge = adapter->sge; - struct respQ *q = &sge->respQ; - struct respQ_e *e = &q->entries[q->cidx]; - int done = 0; - unsigned int flags = 0; - unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; - - while (done < budget && e->GenerationBit == q->genbit) { - flags |= e->Qsleeping; - - cmdq_processed[0] += e->Cmdq0CreditReturn; - cmdq_processed[1] += e->Cmdq1CreditReturn; - - /* We batch updates to the TX side to avoid cacheline - * ping-pong of TX state information on MP where the sender - * might run on a different CPU than this function... - */ - if (unlikely((flags & F_CMDQ0_ENABLE) || cmdq_processed[0] > 64)) { - flags = update_tx_info(adapter, flags, cmdq_processed[0]); - cmdq_processed[0] = 0; - } - - if (unlikely(cmdq_processed[1] > 16)) { - sge->cmdQ[1].processed += cmdq_processed[1]; - cmdq_processed[1] = 0; - } - - if (likely(e->DataValid)) { - struct freelQ *fl = &sge->freelQ[e->FreelistQid]; - - BUG_ON(!e->Sop || !e->Eop); - if (unlikely(e->Offload)) - unexpected_offload(adapter, fl); - else - sge_rx(sge, fl, e->BufferLength); - - ++done; - - /* - * Note: this depends on each packet consuming a - * single free-list buffer; cf. the BUG above. - */ - if (++fl->cidx == fl->size) - fl->cidx = 0; - prefetch(fl->centries[fl->cidx].skb); - - if (unlikely(--fl->credits < - fl->size - SGE_FREEL_REFILL_THRESH)) - refill_free_list(sge, fl); - } else - sge->stats.pure_rsps++; - - e++; - if (unlikely(++q->cidx == q->size)) { - q->cidx = 0; - q->genbit ^= 1; - e = q->entries; - } - prefetch(e); - - if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { - writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); - q->credits = 0; - } - } - - flags = update_tx_info(adapter, flags, cmdq_processed[0]); - sge->cmdQ[1].processed += cmdq_processed[1]; - - return done; -} - -static inline int responses_pending(const struct adapter *adapter) -{ - const struct respQ *Q = &adapter->sge->respQ; - const struct respQ_e *e = &Q->entries[Q->cidx]; - - return e->GenerationBit == Q->genbit; -} - -/* - * A simpler version of process_responses() that handles only pure (i.e., - * non data-carrying) responses. Such respones are too light-weight to justify - * calling a softirq when using NAPI, so we handle them specially in hard - * interrupt context. The function is called with a pointer to a response, - * which the caller must ensure is a valid pure response. Returns 1 if it - * encounters a valid data-carrying response, 0 otherwise. - */ -static int process_pure_responses(struct adapter *adapter) -{ - struct sge *sge = adapter->sge; - struct respQ *q = &sge->respQ; - struct respQ_e *e = &q->entries[q->cidx]; - const struct freelQ *fl = &sge->freelQ[e->FreelistQid]; - unsigned int flags = 0; - unsigned int cmdq_processed[SGE_CMDQ_N] = {0, 0}; - - prefetch(fl->centries[fl->cidx].skb); - if (e->DataValid) - return 1; - - do { - flags |= e->Qsleeping; - - cmdq_processed[0] += e->Cmdq0CreditReturn; - cmdq_processed[1] += e->Cmdq1CreditReturn; - - e++; - if (unlikely(++q->cidx == q->size)) { - q->cidx = 0; - q->genbit ^= 1; - e = q->entries; - } - prefetch(e); - - if (++q->credits > SGE_RESPQ_REPLENISH_THRES) { - writel(q->credits, adapter->regs + A_SG_RSPQUEUECREDIT); - q->credits = 0; - } - sge->stats.pure_rsps++; - } while (e->GenerationBit == q->genbit && !e->DataValid); - - flags = update_tx_info(adapter, flags, cmdq_processed[0]); - sge->cmdQ[1].processed += cmdq_processed[1]; - - return e->GenerationBit == q->genbit; -} - -/* - * Handler for new data events when using NAPI. This does not need any locking - * or protection from interrupts as data interrupts are off at this point and - * other adapter interrupts do not interfere. - */ -int t1_poll(struct napi_struct *napi, int budget) -{ - struct adapter *adapter = container_of(napi, struct adapter, napi); - int work_done = process_responses(adapter, budget); - - if (likely(work_done < budget)) { - napi_complete(napi); - writel(adapter->sge->respQ.cidx, - adapter->regs + A_SG_SLEEPING); - } - return work_done; -} - -irqreturn_t t1_interrupt(int irq, void *data) -{ - struct adapter *adapter = data; - struct sge *sge = adapter->sge; - int handled; - - if (likely(responses_pending(adapter))) { - writel(F_PL_INTR_SGE_DATA, adapter->regs + A_PL_CAUSE); - - if (napi_schedule_prep(&adapter->napi)) { - if (process_pure_responses(adapter)) - __napi_schedule(&adapter->napi); - else { - /* no data, no NAPI needed */ - writel(sge->respQ.cidx, adapter->regs + A_SG_SLEEPING); - /* undo schedule_prep */ - napi_enable(&adapter->napi); - } - } - return IRQ_HANDLED; - } - - spin_lock(&adapter->async_lock); - handled = t1_slow_intr_handler(adapter); - spin_unlock(&adapter->async_lock); - - if (!handled) - sge->stats.unhandled_irqs++; - - return IRQ_RETVAL(handled != 0); -} - -/* - * Enqueues the sk_buff onto the cmdQ[qid] and has hardware fetch it. - * - * The code figures out how many entries the sk_buff will require in the - * cmdQ and updates the cmdQ data structure with the state once the enqueue - * has complete. Then, it doesn't access the global structure anymore, but - * uses the corresponding fields on the stack. In conjunction with a spinlock - * around that code, we can make the function reentrant without holding the - * lock when we actually enqueue (which might be expensive, especially on - * architectures with IO MMUs). - * - * This runs with softirqs disabled. - */ -static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter, - unsigned int qid, struct net_device *dev) -{ - struct sge *sge = adapter->sge; - struct cmdQ *q = &sge->cmdQ[qid]; - unsigned int credits, pidx, genbit, count, use_sched_skb = 0; - - if (!spin_trylock(&q->lock)) - return NETDEV_TX_LOCKED; - - reclaim_completed_tx(sge, q); - - pidx = q->pidx; - credits = q->size - q->in_use; - count = 1 + skb_shinfo(skb)->nr_frags; - count += compute_large_page_tx_descs(skb); - - /* Ethernet packet */ - if (unlikely(credits < count)) { - if (!netif_queue_stopped(dev)) { - netif_stop_queue(dev); - set_bit(dev->if_port, &sge->stopped_tx_queues); - sge->stats.cmdQ_full[2]++; - pr_err("%s: Tx ring full while queue awake!\n", - adapter->name); - } - spin_unlock(&q->lock); - return NETDEV_TX_BUSY; - } - - if (unlikely(credits - count < q->stop_thres)) { - netif_stop_queue(dev); - set_bit(dev->if_port, &sge->stopped_tx_queues); - sge->stats.cmdQ_full[2]++; - } - - /* T204 cmdQ0 skbs that are destined for a certain port have to go - * through the scheduler. - */ - if (sge->tx_sched && !qid && skb->dev) { -use_sched: - use_sched_skb = 1; - /* Note that the scheduler might return a different skb than - * the one passed in. - */ - skb = sched_skb(sge, skb, credits); - if (!skb) { - spin_unlock(&q->lock); - return NETDEV_TX_OK; - } - pidx = q->pidx; - count = 1 + skb_shinfo(skb)->nr_frags; - count += compute_large_page_tx_descs(skb); - } - - q->in_use += count; - genbit = q->genbit; - pidx = q->pidx; - q->pidx += count; - if (q->pidx >= q->size) { - q->pidx -= q->size; - q->genbit ^= 1; - } - spin_unlock(&q->lock); - - write_tx_descs(adapter, skb, pidx, genbit, q); - - /* - * We always ring the doorbell for cmdQ1. For cmdQ0, we only ring - * the doorbell if the Q is asleep. There is a natural race, where - * the hardware is going to sleep just after we checked, however, - * then the interrupt handler will detect the outstanding TX packet - * and ring the doorbell for us. - */ - if (qid) - doorbell_pio(adapter, F_CMDQ1_ENABLE); - else { - clear_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - if (test_and_set_bit(CMDQ_STAT_RUNNING, &q->status) == 0) { - set_bit(CMDQ_STAT_LAST_PKT_DB, &q->status); - writel(F_CMDQ0_ENABLE, adapter->regs + A_SG_DOORBELL); - } - } - - if (use_sched_skb) { - if (spin_trylock(&q->lock)) { - credits = q->size - q->in_use; - skb = NULL; - goto use_sched; - } - } - return NETDEV_TX_OK; -} - -#define MK_ETH_TYPE_MSS(type, mss) (((mss) & 0x3FFF) | ((type) << 14)) - -/* - * eth_hdr_len - return the length of an Ethernet header - * @data: pointer to the start of the Ethernet header - * - * Returns the length of an Ethernet header, including optional VLAN tag. - */ -static inline int eth_hdr_len(const void *data) -{ - const struct ethhdr *e = data; - - return e->h_proto == htons(ETH_P_8021Q) ? VLAN_ETH_HLEN : ETH_HLEN; -} - -/* - * Adds the CPL header to the sk_buff and passes it to t1_sge_tx. - */ -netdev_tx_t t1_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct adapter *adapter = dev->ml_priv; - struct sge *sge = adapter->sge; - struct sge_port_stats *st = this_cpu_ptr(sge->port_stats[dev->if_port]); - struct cpl_tx_pkt *cpl; - struct sk_buff *orig_skb = skb; - int ret; - - if (skb->protocol == htons(ETH_P_CPL5)) - goto send; - - /* - * We are using a non-standard hard_header_len. - * Allocate more header room in the rare cases it is not big enough. - */ - if (unlikely(skb_headroom(skb) < dev->hard_header_len - ETH_HLEN)) { - skb = skb_realloc_headroom(skb, sizeof(struct cpl_tx_pkt_lso)); - ++st->tx_need_hdrroom; - dev_kfree_skb_any(orig_skb); - if (!skb) - return NETDEV_TX_OK; - } - - if (skb_shinfo(skb)->gso_size) { - int eth_type; - struct cpl_tx_pkt_lso *hdr; - - ++st->tx_tso; - - eth_type = skb_network_offset(skb) == ETH_HLEN ? - CPL_ETH_II : CPL_ETH_II_VLAN; - - hdr = (struct cpl_tx_pkt_lso *)skb_push(skb, sizeof(*hdr)); - hdr->opcode = CPL_TX_PKT_LSO; - hdr->ip_csum_dis = hdr->l4_csum_dis = 0; - hdr->ip_hdr_words = ip_hdr(skb)->ihl; - hdr->tcp_hdr_words = tcp_hdr(skb)->doff; - hdr->eth_type_mss = htons(MK_ETH_TYPE_MSS(eth_type, - skb_shinfo(skb)->gso_size)); - hdr->len = htonl(skb->len - sizeof(*hdr)); - cpl = (struct cpl_tx_pkt *)hdr; - } else { - /* - * Packets shorter than ETH_HLEN can break the MAC, drop them - * early. Also, we may get oversized packets because some - * parts of the kernel don't handle our unusual hard_header_len - * right, drop those too. - */ - if (unlikely(skb->len < ETH_HLEN || - skb->len > dev->mtu + eth_hdr_len(skb->data))) { - pr_debug("%s: packet size %d hdr %d mtu%d\n", dev->name, - skb->len, eth_hdr_len(skb->data), dev->mtu); - dev_kfree_skb_any(skb); - return NETDEV_TX_OK; - } - - if (skb->ip_summed == CHECKSUM_PARTIAL && - ip_hdr(skb)->protocol == IPPROTO_UDP) { - if (unlikely(skb_checksum_help(skb))) { - pr_debug("%s: unable to do udp checksum\n", dev->name); - dev_kfree_skb_any(skb); - return NETDEV_TX_OK; - } - } - - /* Hmmm, assuming to catch the gratious arp... and we'll use - * it to flush out stuck espi packets... - */ - if ((unlikely(!adapter->sge->espibug_skb[dev->if_port]))) { - if (skb->protocol == htons(ETH_P_ARP) && - arp_hdr(skb)->ar_op == htons(ARPOP_REQUEST)) { - adapter->sge->espibug_skb[dev->if_port] = skb; - /* We want to re-use this skb later. We - * simply bump the reference count and it - * will not be freed... - */ - skb = skb_get(skb); - } - } - - cpl = (struct cpl_tx_pkt *)__skb_push(skb, sizeof(*cpl)); - cpl->opcode = CPL_TX_PKT; - cpl->ip_csum_dis = 1; /* SW calculates IP csum */ - cpl->l4_csum_dis = skb->ip_summed == CHECKSUM_PARTIAL ? 0 : 1; - /* the length field isn't used so don't bother setting it */ - - st->tx_cso += (skb->ip_summed == CHECKSUM_PARTIAL); - } - cpl->iff = dev->if_port; - - if (vlan_tx_tag_present(skb)) { - cpl->vlan_valid = 1; - cpl->vlan = htons(vlan_tx_tag_get(skb)); - st->vlan_insert++; - } else - cpl->vlan_valid = 0; - -send: - ret = t1_sge_tx(skb, adapter, 0, dev); - - /* If transmit busy, and we reallocated skb's due to headroom limit, - * then silently discard to avoid leak. - */ - if (unlikely(ret != NETDEV_TX_OK && skb != orig_skb)) { - dev_kfree_skb_any(skb); - ret = NETDEV_TX_OK; - } - return ret; -} - -/* - * Callback for the Tx buffer reclaim timer. Runs with softirqs disabled. - */ -static void sge_tx_reclaim_cb(unsigned long data) -{ - int i; - struct sge *sge = (struct sge *)data; - - for (i = 0; i < SGE_CMDQ_N; ++i) { - struct cmdQ *q = &sge->cmdQ[i]; - - if (!spin_trylock(&q->lock)) - continue; - - reclaim_completed_tx(sge, q); - if (i == 0 && q->in_use) { /* flush pending credits */ - writel(F_CMDQ0_ENABLE, sge->adapter->regs + A_SG_DOORBELL); - } - spin_unlock(&q->lock); - } - mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); -} - -/* - * Propagate changes of the SGE coalescing parameters to the HW. - */ -int t1_sge_set_coalesce_params(struct sge *sge, struct sge_params *p) -{ - sge->fixed_intrtimer = p->rx_coalesce_usecs * - core_ticks_per_usec(sge->adapter); - writel(sge->fixed_intrtimer, sge->adapter->regs + A_SG_INTRTIMER); - return 0; -} - -/* - * Allocates both RX and TX resources and configures the SGE. However, - * the hardware is not enabled yet. - */ -int t1_sge_configure(struct sge *sge, struct sge_params *p) -{ - if (alloc_rx_resources(sge, p)) - return -ENOMEM; - if (alloc_tx_resources(sge, p)) { - free_rx_resources(sge); - return -ENOMEM; - } - configure_sge(sge, p); - - /* - * Now that we have sized the free lists calculate the payload - * capacity of the large buffers. Other parts of the driver use - * this to set the max offload coalescing size so that RX packets - * do not overflow our large buffers. - */ - p->large_buf_capacity = jumbo_payload_capacity(sge); - return 0; -} - -/* - * Disables the DMA engine. - */ -void t1_sge_stop(struct sge *sge) -{ - int i; - writel(0, sge->adapter->regs + A_SG_CONTROL); - readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ - - if (is_T2(sge->adapter)) - del_timer_sync(&sge->espibug_timer); - - del_timer_sync(&sge->tx_reclaim_timer); - if (sge->tx_sched) - tx_sched_stop(sge); - - for (i = 0; i < MAX_NPORTS; i++) - kfree_skb(sge->espibug_skb[i]); -} - -/* - * Enables the DMA engine. - */ -void t1_sge_start(struct sge *sge) -{ - refill_free_list(sge, &sge->freelQ[0]); - refill_free_list(sge, &sge->freelQ[1]); - - writel(sge->sge_control, sge->adapter->regs + A_SG_CONTROL); - doorbell_pio(sge->adapter, F_FL0_ENABLE | F_FL1_ENABLE); - readl(sge->adapter->regs + A_SG_CONTROL); /* flush */ - - mod_timer(&sge->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); - - if (is_T2(sge->adapter)) - mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); -} - -/* - * Callback for the T2 ESPI 'stuck packet feature' workaorund - */ -static void espibug_workaround_t204(unsigned long data) -{ - struct adapter *adapter = (struct adapter *)data; - struct sge *sge = adapter->sge; - unsigned int nports = adapter->params.nports; - u32 seop[MAX_NPORTS]; - - if (adapter->open_device_map & PORT_MASK) { - int i; - - if (t1_espi_get_mon_t204(adapter, &(seop[0]), 0) < 0) - return; - - for (i = 0; i < nports; i++) { - struct sk_buff *skb = sge->espibug_skb[i]; - - if (!netif_running(adapter->port[i].dev) || - netif_queue_stopped(adapter->port[i].dev) || - !seop[i] || ((seop[i] & 0xfff) != 0) || !skb) - continue; - - if (!skb->cb[0]) { - skb_copy_to_linear_data_offset(skb, - sizeof(struct cpl_tx_pkt), - ch_mac_addr, - ETH_ALEN); - skb_copy_to_linear_data_offset(skb, - skb->len - 10, - ch_mac_addr, - ETH_ALEN); - skb->cb[0] = 0xff; - } - - /* bump the reference count to avoid freeing of - * the skb once the DMA has completed. - */ - skb = skb_get(skb); - t1_sge_tx(skb, adapter, 0, adapter->port[i].dev); - } - } - mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); -} - -static void espibug_workaround(unsigned long data) -{ - struct adapter *adapter = (struct adapter *)data; - struct sge *sge = adapter->sge; - - if (netif_running(adapter->port[0].dev)) { - struct sk_buff *skb = sge->espibug_skb[0]; - u32 seop = t1_espi_get_mon(adapter, 0x930, 0); - - if ((seop & 0xfff0fff) == 0xfff && skb) { - if (!skb->cb[0]) { - skb_copy_to_linear_data_offset(skb, - sizeof(struct cpl_tx_pkt), - ch_mac_addr, - ETH_ALEN); - skb_copy_to_linear_data_offset(skb, - skb->len - 10, - ch_mac_addr, - ETH_ALEN); - skb->cb[0] = 0xff; - } - - /* bump the reference count to avoid freeing of the - * skb once the DMA has completed. - */ - skb = skb_get(skb); - t1_sge_tx(skb, adapter, 0, adapter->port[0].dev); - } - } - mod_timer(&sge->espibug_timer, jiffies + sge->espibug_timeout); -} - -/* - * Creates a t1_sge structure and returns suggested resource parameters. - */ -struct sge * __devinit t1_sge_create(struct adapter *adapter, - struct sge_params *p) -{ - struct sge *sge = kzalloc(sizeof(*sge), GFP_KERNEL); - int i; - - if (!sge) - return NULL; - - sge->adapter = adapter; - sge->netdev = adapter->port[0].dev; - sge->rx_pkt_pad = t1_is_T1B(adapter) ? 0 : 2; - sge->jumbo_fl = t1_is_T1B(adapter) ? 1 : 0; - - for_each_port(adapter, i) { - sge->port_stats[i] = alloc_percpu(struct sge_port_stats); - if (!sge->port_stats[i]) - goto nomem_port; - } - - init_timer(&sge->tx_reclaim_timer); - sge->tx_reclaim_timer.data = (unsigned long)sge; - sge->tx_reclaim_timer.function = sge_tx_reclaim_cb; - - if (is_T2(sge->adapter)) { - init_timer(&sge->espibug_timer); - - if (adapter->params.nports > 1) { - tx_sched_init(sge); - sge->espibug_timer.function = espibug_workaround_t204; - } else - sge->espibug_timer.function = espibug_workaround; - sge->espibug_timer.data = (unsigned long)sge->adapter; - - sge->espibug_timeout = 1; - /* for T204, every 10ms */ - if (adapter->params.nports > 1) - sge->espibug_timeout = HZ/100; - } - - - p->cmdQ_size[0] = SGE_CMDQ0_E_N; - p->cmdQ_size[1] = SGE_CMDQ1_E_N; - p->freelQ_size[!sge->jumbo_fl] = SGE_FREEL_SIZE; - p->freelQ_size[sge->jumbo_fl] = SGE_JUMBO_FREEL_SIZE; - if (sge->tx_sched) { - if (board_info(sge->adapter)->board == CHBT_BOARD_CHT204) - p->rx_coalesce_usecs = 15; - else - p->rx_coalesce_usecs = 50; - } else - p->rx_coalesce_usecs = 50; - - p->coalesce_enable = 0; - p->sample_interval_usecs = 0; - - return sge; -nomem_port: - while (i >= 0) { - free_percpu(sge->port_stats[i]); - --i; - } - kfree(sge); - return NULL; - -} |