diff options
Diffstat (limited to 'drivers/net/cxgb3/sge.c')
| -rw-r--r-- | drivers/net/cxgb3/sge.c | 3303 |
1 files changed, 0 insertions, 3303 deletions
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c deleted file mode 100644 index d6fa1777a34..00000000000 --- a/drivers/net/cxgb3/sge.c +++ /dev/null @@ -1,3303 +0,0 @@ -/* - * Copyright (c) 2005-2008 Chelsio, Inc. All rights reserved. - * - * This software is available to you under a choice of one of two - * licenses. You may choose to be licensed under the terms of the GNU - * General Public License (GPL) Version 2, available from the file - * COPYING in the main directory of this source tree, or the - * OpenIB.org BSD license below: - * - * Redistribution and use in source and binary forms, with or - * without modification, are permitted provided that the following - * conditions are met: - * - * - Redistributions of source code must retain the above - * copyright notice, this list of conditions and the following - * disclaimer. - * - * - Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials - * provided with the distribution. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF - * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS - * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN - * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN - * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE - * SOFTWARE. - */ -#include <linux/skbuff.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include <linux/if_vlan.h> -#include <linux/ip.h> -#include <linux/tcp.h> -#include <linux/dma-mapping.h> -#include <linux/slab.h> -#include <linux/prefetch.h> -#include <net/arp.h> -#include "common.h" -#include "regs.h" -#include "sge_defs.h" -#include "t3_cpl.h" -#include "firmware_exports.h" -#include "cxgb3_offload.h" - -#define USE_GTS 0 - -#define SGE_RX_SM_BUF_SIZE 1536 - -#define SGE_RX_COPY_THRES 256 -#define SGE_RX_PULL_LEN 128 - -#define SGE_PG_RSVD SMP_CACHE_BYTES -/* - * Page chunk size for FL0 buffers if FL0 is to be populated with page chunks. - * It must be a divisor of PAGE_SIZE. If set to 0 FL0 will use sk_buffs - * directly. - */ -#define FL0_PG_CHUNK_SIZE 2048 -#define FL0_PG_ORDER 0 -#define FL0_PG_ALLOC_SIZE (PAGE_SIZE << FL0_PG_ORDER) -#define FL1_PG_CHUNK_SIZE (PAGE_SIZE > 8192 ? 16384 : 8192) -#define FL1_PG_ORDER (PAGE_SIZE > 8192 ? 0 : 1) -#define FL1_PG_ALLOC_SIZE (PAGE_SIZE << FL1_PG_ORDER) - -#define SGE_RX_DROP_THRES 16 -#define RX_RECLAIM_PERIOD (HZ/4) - -/* - * Max number of Rx buffers we replenish at a time. - */ -#define MAX_RX_REFILL 16U -/* - * 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 TX_RECLAIM_TIMER_CHUNK 64U -#define TX_RECLAIM_CHUNK 16U - -/* WR size in bytes */ -#define WR_LEN (WR_FLITS * 8) - -/* - * Types of Tx queues in each queue set. Order here matters, do not change. - */ -enum { TXQ_ETH, TXQ_OFLD, TXQ_CTRL }; - -/* Values for sge_txq.flags */ -enum { - TXQ_RUNNING = 1 << 0, /* fetch engine is running */ - TXQ_LAST_PKT_DB = 1 << 1, /* last packet rang the doorbell */ -}; - -struct tx_desc { - __be64 flit[TX_DESC_FLITS]; -}; - -struct rx_desc { - __be32 addr_lo; - __be32 len_gen; - __be32 gen2; - __be32 addr_hi; -}; - -struct tx_sw_desc { /* SW state per Tx descriptor */ - struct sk_buff *skb; - u8 eop; /* set if last descriptor for packet */ - u8 addr_idx; /* buffer index of first SGL entry in descriptor */ - u8 fragidx; /* first page fragment associated with descriptor */ - s8 sflit; /* start flit of first SGL entry in descriptor */ -}; - -struct rx_sw_desc { /* SW state per Rx descriptor */ - union { - struct sk_buff *skb; - struct fl_pg_chunk pg_chunk; - }; - DEFINE_DMA_UNMAP_ADDR(dma_addr); -}; - -struct rsp_desc { /* response queue descriptor */ - struct rss_header rss_hdr; - __be32 flags; - __be32 len_cq; - u8 imm_data[47]; - u8 intr_gen; -}; - -/* - * Holds unmapping information for Tx packets that need deferred unmapping. - * This structure lives at skb->head and must be allocated by callers. - */ -struct deferred_unmap_info { - struct pci_dev *pdev; - dma_addr_t addr[MAX_SKB_FRAGS + 1]; -}; - -/* - * Maps a number of flits to the number of Tx descriptors that can hold them. - * The formula is - * - * desc = 1 + (flits - 2) / (WR_FLITS - 1). - * - * HW allows up to 4 descriptors to be combined into a WR. - */ -static u8 flit_desc_map[] = { - 0, -#if SGE_NUM_GENBITS == 1 - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 -#elif SGE_NUM_GENBITS == 2 - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, -#else -# error "SGE_NUM_GENBITS must be 1 or 2" -#endif -}; - -static inline struct sge_qset *fl_to_qset(const struct sge_fl *q, int qidx) -{ - return container_of(q, struct sge_qset, fl[qidx]); -} - -static inline struct sge_qset *rspq_to_qset(const struct sge_rspq *q) -{ - return container_of(q, struct sge_qset, rspq); -} - -static inline struct sge_qset *txq_to_qset(const struct sge_txq *q, int qidx) -{ - return container_of(q, struct sge_qset, txq[qidx]); -} - -/** - * refill_rspq - replenish an SGE response queue - * @adapter: the adapter - * @q: the response queue to replenish - * @credits: how many new responses to make available - * - * Replenishes a response queue by making the supplied number of responses - * available to HW. - */ -static inline void refill_rspq(struct adapter *adapter, - const struct sge_rspq *q, unsigned int credits) -{ - rmb(); - t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN, - V_RSPQ(q->cntxt_id) | V_CREDITS(credits)); -} - -/** - * need_skb_unmap - does the platform need unmapping of sk_buffs? - * - * Returns true if the platform needs sk_buff unmapping. The compiler - * optimizes away unnecessary code if this returns true. - */ -static inline int need_skb_unmap(void) -{ -#ifdef CONFIG_NEED_DMA_MAP_STATE - return 1; -#else - return 0; -#endif -} - -/** - * unmap_skb - unmap a packet main body and its page fragments - * @skb: the packet - * @q: the Tx queue containing Tx descriptors for the packet - * @cidx: index of Tx descriptor - * @pdev: the PCI device - * - * Unmap the main body of an sk_buff and its page fragments, if any. - * Because of the fairly complicated structure of our SGLs and the desire - * to conserve space for metadata, the information necessary to unmap an - * sk_buff is spread across the sk_buff itself (buffer lengths), the HW Tx - * descriptors (the physical addresses of the various data buffers), and - * the SW descriptor state (assorted indices). The send functions - * initialize the indices for the first packet descriptor so we can unmap - * the buffers held in the first Tx descriptor here, and we have enough - * information at this point to set the state for the next Tx descriptor. - * - * Note that it is possible to clean up the first descriptor of a packet - * before the send routines have written the next descriptors, but this - * race does not cause any problem. We just end up writing the unmapping - * info for the descriptor first. - */ -static inline void unmap_skb(struct sk_buff *skb, struct sge_txq *q, - unsigned int cidx, struct pci_dev *pdev) -{ - const struct sg_ent *sgp; - struct tx_sw_desc *d = &q->sdesc[cidx]; - int nfrags, frag_idx, curflit, j = d->addr_idx; - - sgp = (struct sg_ent *)&q->desc[cidx].flit[d->sflit]; - frag_idx = d->fragidx; - - if (frag_idx == 0 && skb_headlen(skb)) { - pci_unmap_single(pdev, be64_to_cpu(sgp->addr[0]), - skb_headlen(skb), PCI_DMA_TODEVICE); - j = 1; - } - - curflit = d->sflit + 1 + j; - nfrags = skb_shinfo(skb)->nr_frags; - - while (frag_idx < nfrags && curflit < WR_FLITS) { - pci_unmap_page(pdev, be64_to_cpu(sgp->addr[j]), - skb_shinfo(skb)->frags[frag_idx].size, - PCI_DMA_TODEVICE); - j ^= 1; - if (j == 0) { - sgp++; - curflit++; - } - curflit++; - frag_idx++; - } - - if (frag_idx < nfrags) { /* SGL continues into next Tx descriptor */ - d = cidx + 1 == q->size ? q->sdesc : d + 1; - d->fragidx = frag_idx; - d->addr_idx = j; - d->sflit = curflit - WR_FLITS - j; /* sflit can be -1 */ - } -} - -/** - * free_tx_desc - reclaims Tx descriptors and their buffers - * @adapter: the adapter - * @q: the Tx queue to reclaim descriptors from - * @n: the number of descriptors to reclaim - * - * Reclaims Tx descriptors from an SGE Tx queue and frees the associated - * Tx buffers. Called with the Tx queue lock held. - */ -static void free_tx_desc(struct adapter *adapter, struct sge_txq *q, - unsigned int n) -{ - struct tx_sw_desc *d; - struct pci_dev *pdev = adapter->pdev; - unsigned int cidx = q->cidx; - - const int need_unmap = need_skb_unmap() && - q->cntxt_id >= FW_TUNNEL_SGEEC_START; - - d = &q->sdesc[cidx]; - while (n--) { - if (d->skb) { /* an SGL is present */ - if (need_unmap) - unmap_skb(d->skb, q, cidx, pdev); - if (d->eop) { - kfree_skb(d->skb); - d->skb = NULL; - } - } - ++d; - if (++cidx == q->size) { - cidx = 0; - d = q->sdesc; - } - } - q->cidx = cidx; -} - -/** - * reclaim_completed_tx - reclaims completed Tx descriptors - * @adapter: the adapter - * @q: the Tx queue to reclaim completed descriptors from - * @chunk: maximum number of descriptors to reclaim - * - * Reclaims Tx descriptors that the SGE has indicated it has processed, - * and frees the associated buffers if possible. Called with the Tx - * queue's lock held. - */ -static inline unsigned int reclaim_completed_tx(struct adapter *adapter, - struct sge_txq *q, - unsigned int chunk) -{ - unsigned int reclaim = q->processed - q->cleaned; - - reclaim = min(chunk, reclaim); - if (reclaim) { - free_tx_desc(adapter, q, reclaim); - q->cleaned += reclaim; - q->in_use -= reclaim; - } - return q->processed - q->cleaned; -} - -/** - * should_restart_tx - are there enough resources to restart a Tx queue? - * @q: the Tx queue - * - * Checks if there are enough descriptors to restart a suspended Tx queue. - */ -static inline int should_restart_tx(const struct sge_txq *q) -{ - unsigned int r = q->processed - q->cleaned; - - return q->in_use - r < (q->size >> 1); -} - -static void clear_rx_desc(struct pci_dev *pdev, const struct sge_fl *q, - struct rx_sw_desc *d) -{ - if (q->use_pages && d->pg_chunk.page) { - (*d->pg_chunk.p_cnt)--; - if (!*d->pg_chunk.p_cnt) - pci_unmap_page(pdev, - d->pg_chunk.mapping, - q->alloc_size, PCI_DMA_FROMDEVICE); - - put_page(d->pg_chunk.page); - d->pg_chunk.page = NULL; - } else { - pci_unmap_single(pdev, dma_unmap_addr(d, dma_addr), - q->buf_size, PCI_DMA_FROMDEVICE); - kfree_skb(d->skb); - d->skb = NULL; - } -} - -/** - * free_rx_bufs - free the Rx buffers on an SGE free list - * @pdev: the PCI device associated with the adapter - * @rxq: the SGE free list to clean up - * - * Release the buffers on an SGE free-buffer Rx queue. HW fetching from - * this queue should be stopped before calling this function. - */ -static void free_rx_bufs(struct pci_dev *pdev, struct sge_fl *q) -{ - unsigned int cidx = q->cidx; - - while (q->credits--) { - struct rx_sw_desc *d = &q->sdesc[cidx]; - - - clear_rx_desc(pdev, q, d); - if (++cidx == q->size) - cidx = 0; - } - - if (q->pg_chunk.page) { - __free_pages(q->pg_chunk.page, q->order); - q->pg_chunk.page = NULL; - } -} - -/** - * add_one_rx_buf - add a packet buffer to a free-buffer list - * @va: buffer start VA - * @len: the buffer length - * @d: the HW Rx descriptor to write - * @sd: the SW Rx descriptor to write - * @gen: the generation bit value - * @pdev: the PCI device associated with the adapter - * - * Add a buffer of the given length to the supplied HW and SW Rx - * descriptors. - */ -static inline int add_one_rx_buf(void *va, unsigned int len, - struct rx_desc *d, struct rx_sw_desc *sd, - unsigned int gen, struct pci_dev *pdev) -{ - dma_addr_t mapping; - - mapping = pci_map_single(pdev, va, len, PCI_DMA_FROMDEVICE); - if (unlikely(pci_dma_mapping_error(pdev, mapping))) - return -ENOMEM; - - dma_unmap_addr_set(sd, dma_addr, mapping); - - d->addr_lo = cpu_to_be32(mapping); - d->addr_hi = cpu_to_be32((u64) mapping >> 32); - wmb(); - d->len_gen = cpu_to_be32(V_FLD_GEN1(gen)); - d->gen2 = cpu_to_be32(V_FLD_GEN2(gen)); - return 0; -} - -static inline int add_one_rx_chunk(dma_addr_t mapping, struct rx_desc *d, - unsigned int gen) -{ - d->addr_lo = cpu_to_be32(mapping); - d->addr_hi = cpu_to_be32((u64) mapping >> 32); - wmb(); - d->len_gen = cpu_to_be32(V_FLD_GEN1(gen)); - d->gen2 = cpu_to_be32(V_FLD_GEN2(gen)); - return 0; -} - -static int alloc_pg_chunk(struct adapter *adapter, struct sge_fl *q, - struct rx_sw_desc *sd, gfp_t gfp, - unsigned int order) -{ - if (!q->pg_chunk.page) { - dma_addr_t mapping; - - q->pg_chunk.page = alloc_pages(gfp, order); - if (unlikely(!q->pg_chunk.page)) - return -ENOMEM; - q->pg_chunk.va = page_address(q->pg_chunk.page); - q->pg_chunk.p_cnt = q->pg_chunk.va + (PAGE_SIZE << order) - - SGE_PG_RSVD; - q->pg_chunk.offset = 0; - mapping = pci_map_page(adapter->pdev, q->pg_chunk.page, - 0, q->alloc_size, PCI_DMA_FROMDEVICE); - q->pg_chunk.mapping = mapping; - } - sd->pg_chunk = q->pg_chunk; - - prefetch(sd->pg_chunk.p_cnt); - - q->pg_chunk.offset += q->buf_size; - if (q->pg_chunk.offset == (PAGE_SIZE << order)) - q->pg_chunk.page = NULL; - else { - q->pg_chunk.va += q->buf_size; - get_page(q->pg_chunk.page); - } - - if (sd->pg_chunk.offset == 0) - *sd->pg_chunk.p_cnt = 1; - else - *sd->pg_chunk.p_cnt += 1; - - return 0; -} - -static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q) -{ - if (q->pend_cred >= q->credits / 4) { - q->pend_cred = 0; - wmb(); - t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); - } -} - -/** - * refill_fl - refill an SGE free-buffer list - * @adapter: the adapter - * @q: the free-list to refill - * @n: the number of new buffers to allocate - * @gfp: the gfp flags for allocating new buffers - * - * (Re)populate an SGE free-buffer list with up to @n new packet buffers, - * allocated with the supplied gfp flags. The caller must assure that - * @n does not exceed the queue's capacity. - */ -static int refill_fl(struct adapter *adap, struct sge_fl *q, int n, gfp_t gfp) -{ - struct rx_sw_desc *sd = &q->sdesc[q->pidx]; - struct rx_desc *d = &q->desc[q->pidx]; - unsigned int count = 0; - - while (n--) { - dma_addr_t mapping; - int err; - - if (q->use_pages) { - if (unlikely(alloc_pg_chunk(adap, q, sd, gfp, - q->order))) { -nomem: q->alloc_failed++; - break; - } - mapping = sd->pg_chunk.mapping + sd->pg_chunk.offset; - dma_unmap_addr_set(sd, dma_addr, mapping); - - add_one_rx_chunk(mapping, d, q->gen); - pci_dma_sync_single_for_device(adap->pdev, mapping, - q->buf_size - SGE_PG_RSVD, - PCI_DMA_FROMDEVICE); - } else { - void *buf_start; - - struct sk_buff *skb = alloc_skb(q->buf_size, gfp); - if (!skb) - goto nomem; - - sd->skb = skb; - buf_start = skb->data; - err = add_one_rx_buf(buf_start, q->buf_size, d, sd, - q->gen, adap->pdev); - if (unlikely(err)) { - clear_rx_desc(adap->pdev, q, sd); - break; - } - } - - d++; - sd++; - if (++q->pidx == q->size) { - q->pidx = 0; - q->gen ^= 1; - sd = q->sdesc; - d = q->desc; - } - count++; - } - - q->credits += count; - q->pend_cred += count; - ring_fl_db(adap, q); - - return count; -} - -static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl) -{ - refill_fl(adap, fl, min(MAX_RX_REFILL, fl->size - fl->credits), - GFP_ATOMIC | __GFP_COMP); -} - -/** - * recycle_rx_buf - recycle a receive buffer - * @adapter: the adapter - * @q: the SGE 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_rx_buf(struct adapter *adap, struct sge_fl *q, - unsigned int idx) -{ - struct rx_desc *from = &q->desc[idx]; - struct rx_desc *to = &q->desc[q->pidx]; - - q->sdesc[q->pidx] = q->sdesc[idx]; - to->addr_lo = from->addr_lo; /* already big endian */ - to->addr_hi = from->addr_hi; /* likewise */ - wmb(); - to->len_gen = cpu_to_be32(V_FLD_GEN1(q->gen)); - to->gen2 = cpu_to_be32(V_FLD_GEN2(q->gen)); - - if (++q->pidx == q->size) { - q->pidx = 0; - q->gen ^= 1; - } - - q->credits++; - q->pend_cred++; - ring_fl_db(adap, q); -} - -/** - * alloc_ring - allocate resources for an SGE descriptor ring - * @pdev: the PCI device - * @nelem: the number of descriptors - * @elem_size: the size of each descriptor - * @sw_size: the size of the SW state associated with each ring element - * @phys: the physical address of the allocated ring - * @metadata: address of the array holding the SW state for the ring - * - * Allocates resources for an SGE descriptor ring, such as Tx queues, - * free buffer lists, or response queues. Each SGE ring requires - * space for its HW descriptors plus, optionally, space for the SW state - * associated with each HW entry (the metadata). The function returns - * three values: the virtual address for the HW ring (the return value - * of the function), the physical address of the HW ring, and the address - * of the SW ring. - */ -static void *alloc_ring(struct pci_dev *pdev, size_t nelem, size_t elem_size, - size_t sw_size, dma_addr_t * phys, void *metadata) -{ - size_t len = nelem * elem_size; - void *s = NULL; - void *p = dma_alloc_coherent(&pdev->dev, len, phys, GFP_KERNEL); - - if (!p) - return NULL; - if (sw_size && metadata) { - s = kcalloc(nelem, sw_size, GFP_KERNEL); - - if (!s) { - dma_free_coherent(&pdev->dev, len, p, *phys); - return NULL; - } - *(void **)metadata = s; - } - memset(p, 0, len); - return p; -} - -/** - * t3_reset_qset - reset a sge qset - * @q: the queue set - * - * Reset the qset structure. - * the NAPI structure is preserved in the event of - * the qset's reincarnation, for example during EEH recovery. - */ -static void t3_reset_qset(struct sge_qset *q) -{ - if (q->adap && - !(q->adap->flags & NAPI_INIT)) { - memset(q, 0, sizeof(*q)); - return; - } - - q->adap = NULL; - memset(&q->rspq, 0, sizeof(q->rspq)); - memset(q->fl, 0, sizeof(struct sge_fl) * SGE_RXQ_PER_SET); - memset(q->txq, 0, sizeof(struct sge_txq) * SGE_TXQ_PER_SET); - q->txq_stopped = 0; - q->tx_reclaim_timer.function = NULL; /* for t3_stop_sge_timers() */ - q->rx_reclaim_timer.function = NULL; - q->nomem = 0; - napi_free_frags(&q->napi); -} - - -/** - * free_qset - free the resources of an SGE queue set - * @adapter: the adapter owning the queue set - * @q: the queue set - * - * Release the HW and SW resources associated with an SGE queue set, such - * as HW contexts, packet buffers, and descriptor rings. Traffic to the - * queue set must be quiesced prior to calling this. - */ -static void t3_free_qset(struct adapter *adapter, struct sge_qset *q) -{ - int i; - struct pci_dev *pdev = adapter->pdev; - - for (i = 0; i < SGE_RXQ_PER_SET; ++i) - if (q->fl[i].desc) { - spin_lock_irq(&adapter->sge.reg_lock); - t3_sge_disable_fl(adapter, q->fl[i].cntxt_id); - spin_unlock_irq(&adapter->sge.reg_lock); - free_rx_bufs(pdev, &q->fl[i]); - kfree(q->fl[i].sdesc); - dma_free_coherent(&pdev->dev, - q->fl[i].size * - sizeof(struct rx_desc), q->fl[i].desc, - q->fl[i].phys_addr); - } - - for (i = 0; i < SGE_TXQ_PER_SET; ++i) - if (q->txq[i].desc) { - spin_lock_irq(&adapter->sge.reg_lock); - t3_sge_enable_ecntxt(adapter, q->txq[i].cntxt_id, 0); - spin_unlock_irq(&adapter->sge.reg_lock); - if (q->txq[i].sdesc) { - free_tx_desc(adapter, &q->txq[i], - q->txq[i].in_use); - kfree(q->txq[i].sdesc); - } - dma_free_coherent(&pdev->dev, - q->txq[i].size * - sizeof(struct tx_desc), - q->txq[i].desc, q->txq[i].phys_addr); - __skb_queue_purge(&q->txq[i].sendq); - } - - if (q->rspq.desc) { - spin_lock_irq(&adapter->sge.reg_lock); - t3_sge_disable_rspcntxt(adapter, q->rspq.cntxt_id); - spin_unlock_irq(&adapter->sge.reg_lock); - dma_free_coherent(&pdev->dev, - q->rspq.size * sizeof(struct rsp_desc), - q->rspq.desc, q->rspq.phys_addr); - } - - t3_reset_qset(q); -} - -/** - * init_qset_cntxt - initialize an SGE queue set context info - * @qs: the queue set - * @id: the queue set id - * - * Initializes the TIDs and context ids for the queues of a queue set. - */ -static void init_qset_cntxt(struct sge_qset *qs, unsigned int id) -{ - qs->rspq.cntxt_id = id; - qs->fl[0].cntxt_id = 2 * id; - qs->fl[1].cntxt_id = 2 * id + 1; - qs->txq[TXQ_ETH].cntxt_id = FW_TUNNEL_SGEEC_START + id; - qs->txq[TXQ_ETH].token = FW_TUNNEL_TID_START + id; - qs->txq[TXQ_OFLD].cntxt_id = FW_OFLD_SGEEC_START + id; - qs->txq[TXQ_CTRL].cntxt_id = FW_CTRL_SGEEC_START + id; - qs->txq[TXQ_CTRL].token = FW_CTRL_TID_START + id; -} - -/** - * sgl_len - calculates the size of an SGL of the given capacity - * @n: the number of SGL entries - * - * Calculates the number of flits needed for a scatter/gather list that - * can hold the given number of entries. - */ -static inline unsigned int sgl_len(unsigned int n) -{ - /* alternatively: 3 * (n / 2) + 2 * (n & 1) */ - return (3 * n) / 2 + (n & 1); -} - -/** - * flits_to_desc - returns the num of Tx descriptors for the given flits - * @n: the number of flits - * - * Calculates the number of Tx descriptors needed for the supplied number - * of flits. - */ -static inline unsigned int flits_to_desc(unsigned int n) -{ - BUG_ON(n >= ARRAY_SIZE(flit_desc_map)); - return flit_desc_map[n]; -} - -/** - * get_packet - return the next ingress packet buffer from a free list - * @adap: the adapter that received the packet - * @fl: the SGE free list holding the packet - * @len: the packet length including any SGE padding - * @drop_thres: # of remaining buffers before we start dropping packets - * - * 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 struct sk_buff *get_packet(struct adapter *adap, struct sge_fl *fl, - unsigned int len, unsigned int drop_thres) -{ - struct sk_buff *skb = NULL; - struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; - - prefetch(sd->skb->data); - fl->credits--; - - if (len <= SGE_RX_COPY_THRES) { - skb = alloc_skb(len, GFP_ATOMIC); - if (likely(skb != NULL)) { - __skb_put(skb, len); - pci_dma_sync_single_for_cpu(adap->pdev, - dma_unmap_addr(sd, dma_addr), len, - PCI_DMA_FROMDEVICE); - memcpy(skb->data, sd->skb->data, len); - pci_dma_sync_single_for_device(adap->pdev, - dma_unmap_addr(sd, dma_addr), len, - PCI_DMA_FROMDEVICE); - } else if (!drop_thres) - goto use_orig_buf; -recycle: - recycle_rx_buf(adap, fl, fl->cidx); - return skb; - } - - if (unlikely(fl->credits < drop_thres) && - refill_fl(adap, fl, min(MAX_RX_REFILL, fl->size - fl->credits - 1), - GFP_ATOMIC | __GFP_COMP) == 0) - goto recycle; - -use_orig_buf: - pci_unmap_single(adap->pdev, dma_unmap_addr(sd, dma_addr), - fl->buf_size, PCI_DMA_FROMDEVICE); - skb = sd->skb; - skb_put(skb, len); - __refill_fl(adap, fl); - return skb; -} - -/** - * get_packet_pg - return the next ingress packet buffer from a free list - * @adap: the adapter that received the packet - * @fl: the SGE free list holding the packet - * @len: the packet length including any SGE padding - * @drop_thres: # of remaining buffers before we start dropping packets - * - * Get the next packet from a free list populated with page chunks. - * If the packet is small we make a copy and recycle the original buffer, - * otherwise we attach the original buffer as a page fragment to a fresh - * sk_buff. 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) there's - * no system memory. - * - * Note: this function is similar to @get_packet but deals with Rx buffers - * that are page chunks rather than sk_buffs. - */ -static struct sk_buff *get_packet_pg(struct adapter *adap, struct sge_fl *fl, - struct sge_rspq *q, unsigned int len, - unsigned int drop_thres) -{ - struct sk_buff *newskb, *skb; - struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; - - dma_addr_t dma_addr = dma_unmap_addr(sd, dma_addr); - - newskb = skb = q->pg_skb; - if (!skb && (len <= SGE_RX_COPY_THRES)) { - newskb = alloc_skb(len, GFP_ATOMIC); - if (likely(newskb != NULL)) { - __skb_put(newskb, len); - pci_dma_sync_single_for_cpu(adap->pdev, dma_addr, len, - PCI_DMA_FROMDEVICE); - memcpy(newskb->data, sd->pg_chunk.va, len); - pci_dma_sync_single_for_device(adap->pdev, dma_addr, - len, - PCI_DMA_FROMDEVICE); - } else if (!drop_thres) - return NULL; -recycle: - fl->credits--; - recycle_rx_buf(adap, fl, fl->cidx); - q->rx_recycle_buf++; - return newskb; - } - - if (unlikely(q->rx_recycle_buf || (!skb && fl->credits <= drop_thres))) - goto recycle; - - prefetch(sd->pg_chunk.p_cnt); - - if (!skb) - newskb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC); - - if (unlikely(!newskb)) { - if (!drop_thres) - return NULL; - goto recycle; - } - - pci_dma_sync_single_for_cpu(adap->pdev, dma_addr, len, - PCI_DMA_FROMDEVICE); - (*sd->pg_chunk.p_cnt)--; - if (!*sd->pg_chunk.p_cnt && sd->pg_chunk.page != fl->pg_chunk.page) - pci_unmap_page(adap->pdev, - sd->pg_chunk.mapping, - fl->alloc_size, - PCI_DMA_FROMDEVICE); - if (!skb) { - __skb_put(newskb, SGE_RX_PULL_LEN); - memcpy(newskb->data, sd->pg_chunk.va, SGE_RX_PULL_LEN); - skb_fill_page_desc(newskb, 0, sd->pg_chunk.page, - sd->pg_chunk.offset + SGE_RX_PULL_LEN, - len - SGE_RX_PULL_LEN); - newskb->len = len; - newskb->data_len = len - SGE_RX_PULL_LEN; - newskb->truesize += newskb->data_len; - } else { - skb_fill_page_desc(newskb, skb_shinfo(newskb)->nr_frags, - sd->pg_chunk.page, - sd->pg_chunk.offset, len); - newskb->len += len; - newskb->data_len += len; - newskb->truesize += len; - } - - fl->credits--; - /* - * We do not refill FLs here, we let the caller do it to overlap a - * prefetch. - */ - return newskb; -} - -/** - * get_imm_packet - return the next ingress packet buffer from a response - * @resp: the response descriptor containing the packet data - * - * Return a packet containing the immediate data of the given response. - */ -static inline struct sk_buff *get_imm_packet(const struct rsp_desc *resp) -{ - struct sk_buff *skb = alloc_skb(IMMED_PKT_SIZE, GFP_ATOMIC); - - if (skb) { - __skb_put(skb, IMMED_PKT_SIZE); - skb_copy_to_linear_data(skb, resp->imm_data, IMMED_PKT_SIZE); - } - return skb; -} - -/** - * calc_tx_descs - calculate the number of Tx descriptors for a packet - * @skb: the packet - * - * Returns the number of Tx descriptors needed for the given Ethernet - * packet. Ethernet packets require addition of WR and CPL headers. - */ -static inline unsigned int calc_tx_descs(const struct sk_buff *skb) -{ - unsigned int flits; - - if (skb->len <= WR_LEN - sizeof(struct cpl_tx_pkt)) - return 1; - - flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 2; - if (skb_shinfo(skb)->gso_size) - flits++; - return flits_to_desc(flits); -} - -/** - * make_sgl - populate a scatter/gather list for a packet - * @skb: the packet - * @sgp: the SGL to populate - * @start: start address of skb main body data to include in the SGL - * @len: length of skb main body data to include in the SGL - * @pdev: the PCI device - * - * Generates a scatter/gather list for the buffers that make up a packet - * and returns the SGL size in 8-byte words. The caller must size the SGL - * appropriately. - */ -static inline unsigned int make_sgl(const struct sk_buff *skb, - struct sg_ent *sgp, unsigned char *start, - unsigned int len, struct pci_dev *pdev) -{ - dma_addr_t mapping; - unsigned int i, j = 0, nfrags; - - if (len) { - mapping = pci_map_single(pdev, start, len, PCI_DMA_TODEVICE); - sgp->len[0] = cpu_to_be32(len); - sgp->addr[0] = cpu_to_be64(mapping); - j = 1; - } - - nfrags = skb_shinfo(skb)->nr_frags; - for (i = 0; i < nfrags; i++) { - skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; - - mapping = pci_map_page(pdev, frag->page, frag->page_offset, - frag->size, PCI_DMA_TODEVICE); - sgp->len[j] = cpu_to_be32(frag->size); - sgp->addr[j] = cpu_to_be64(mapping); - j ^= 1; - if (j == 0) - ++sgp; - } - if (j) - sgp->len[j] = 0; - return ((nfrags + (len != 0)) * 3) / 2 + j; -} - -/** - * check_ring_tx_db - check and potentially ring a Tx queue's doorbell - * @adap: the adapter - * @q: the Tx queue - * - * Ring the doorbel if a Tx queue is asleep. There is a natural race, - * where the HW 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. - * - * When GTS is disabled we unconditionally ring the doorbell. - */ -static inline void check_ring_tx_db(struct adapter *adap, struct sge_txq *q) -{ -#if USE_GTS - clear_bit(TXQ_LAST_PKT_DB, &q->flags); - if (test_and_set_bit(TXQ_RUNNING, &q->flags) == 0) { - set_bit(TXQ_LAST_PKT_DB, &q->flags); - t3_write_reg(adap, A_SG_KDOORBELL, - F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); - } -#else - wmb(); /* write descriptors before telling HW */ - t3_write_reg(adap, A_SG_KDOORBELL, - F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); -#endif -} - -static inline void wr_gen2(struct tx_desc *d, unsigned int gen) -{ -#if SGE_NUM_GENBITS == 2 - d->flit[TX_DESC_FLITS - 1] = cpu_to_be64(gen); -#endif -} - -/** - * write_wr_hdr_sgl - write a WR header and, optionally, SGL - * @ndesc: number of Tx descriptors spanned by the SGL - * @skb: the packet corresponding to the WR - * @d: first Tx descriptor to be written - * @pidx: index of above descriptors - * @q: the SGE Tx queue - * @sgl: the SGL - * @flits: number of flits to the start of the SGL in the first descriptor - * @sgl_flits: the SGL size in flits - * @gen: the Tx descriptor generation - * @wr_hi: top 32 bits of WR header based on WR type (big endian) - * @wr_lo: low 32 bits of WR header based on WR type (big endian) - * - * Write a work request header and an associated SGL. If the SGL is - * small enough to fit into one Tx descriptor it has already been written - * and we just need to write the WR header. Otherwise we distribute the - * SGL across the number of descriptors it spans. - */ -static void write_wr_hdr_sgl(unsigned int ndesc, struct sk_buff *skb, - struct tx_desc *d, unsigned int pidx, - const struct sge_txq *q, - const struct sg_ent *sgl, - unsigned int flits, unsigned int sgl_flits, - unsigned int gen, __be32 wr_hi, - __be32 wr_lo) -{ - struct work_request_hdr *wrp = (struct work_request_hdr *)d; - struct tx_sw_desc *sd = &q->sdesc[pidx]; - - sd->skb = skb; - if (need_skb_unmap()) { - sd->fragidx = 0; - sd->addr_idx = 0; - sd->sflit = flits; - } - - if (likely(ndesc == 1)) { - sd->eop = 1; - wrp->wr_hi = htonl(F_WR_SOP | F_WR_EOP | V_WR_DATATYPE(1) | - V_WR_SGLSFLT(flits)) | wr_hi; - wmb(); - wrp->wr_lo = htonl(V_WR_LEN(flits + sgl_flits) | - V_WR_GEN(gen)) | wr_lo; - wr_gen2(d, gen); - } else { - unsigned int ogen = gen; - const u64 *fp = (const u64 *)sgl; - struct work_request_hdr *wp = wrp; - - wrp->wr_hi = htonl(F_WR_SOP | V_WR_DATATYPE(1) | - V_WR_SGLSFLT(flits)) | wr_hi; - - while (sgl_flits) { - unsigned int avail = WR_FLITS - flits; - - if (avail > sgl_flits) - avail = sgl_flits; - memcpy(&d->flit[flits], fp, avail * sizeof(*fp)); - sgl_flits -= avail; - ndesc--; - if (!sgl_flits) - break; - - fp += avail; - d++; - sd->eop = 0; - sd++; - if (++pidx == q->size) { - pidx = 0; - gen ^= 1; - d = q->desc; - sd = q->sdesc; - } - - sd->skb = skb; - wrp = (struct work_request_hdr *)d; - wrp->wr_hi = htonl(V_WR_DATATYPE(1) | - V_WR_SGLSFLT(1)) | wr_hi; - wrp->wr_lo = htonl(V_WR_LEN(min(WR_FLITS, - sgl_flits + 1)) | - V_WR_GEN(gen)) | wr_lo; - wr_gen2(d, gen); - flits = 1; - } - sd->eop = 1; - wrp->wr_hi |= htonl(F_WR_EOP); - wmb(); - wp->wr_lo = htonl(V_WR_LEN(WR_FLITS) | V_WR_GEN(ogen)) | wr_lo; - wr_gen2((struct tx_desc *)wp, ogen); - WARN_ON(ndesc != 0); - } -} - -/** - * write_tx_pkt_wr - write a TX_PKT work request - * @adap: the adapter - * @skb: the packet to send - * @pi: the egress interface - * @pidx: index of the first Tx descriptor to write - * @gen: the generation value to use - * @q: the Tx queue - * @ndesc: number of descriptors the packet will occupy - * @compl: the value of the COMPL bit to use - * - * Generate a TX_PKT work request to send the supplied packet. - */ -static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb, - const struct port_info *pi, - unsigned int pidx, unsigned int gen, - struct sge_txq *q, unsigned int ndesc, - unsigned int compl) -{ - unsigned int flits, sgl_flits, cntrl, tso_info; - struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; - struct tx_desc *d = &q->desc[pidx]; - struct cpl_tx_pkt *cpl = (struct cpl_tx_pkt *)d; - - cpl->len = htonl(skb->len); - cntrl = V_TXPKT_INTF(pi->port_id); - - if (vlan_tx_tag_present(skb)) - cntrl |= F_TXPKT_VLAN_VLD | V_TXPKT_VLAN(vlan_tx_tag_get(skb)); - - tso_info = V_LSO_MSS(skb_shinfo(skb)->gso_size); - if (tso_info) { - int eth_type; - struct cpl_tx_pkt_lso *hdr = (struct cpl_tx_pkt_lso *)cpl; - - d->flit[2] = 0; - cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT_LSO); - hdr->cntrl = htonl(cntrl); - eth_type = skb_network_offset(skb) == ETH_HLEN ? - CPL_ETH_II : CPL_ETH_II_VLAN; - tso_info |= V_LSO_ETH_TYPE(eth_type) | - V_LSO_IPHDR_WORDS(ip_hdr(skb)->ihl) | - V_LSO_TCPHDR_WORDS(tcp_hdr(skb)->doff); - hdr->lso_info = htonl(tso_info); - flits = 3; - } else { - cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT); - cntrl |= F_TXPKT_IPCSUM_DIS; /* SW calculates IP csum */ - cntrl |= V_TXPKT_L4CSUM_DIS(skb->ip_summed != CHECKSUM_PARTIAL); - cpl->cntrl = htonl(cntrl); - - if (skb->len <= WR_LEN - sizeof(*cpl)) { - q->sdesc[pidx].skb = NULL; - if (!skb->data_len) - skb_copy_from_linear_data(skb, &d->flit[2], - skb->len); - else - skb_copy_bits(skb, 0, &d->flit[2], skb->len); - - flits = (skb->len + 7) / 8 + 2; - cpl->wr.wr_hi = htonl(V_WR_BCNTLFLT(skb->len & 7) | - V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) - | F_WR_SOP | F_WR_EOP | compl); - wmb(); - cpl->wr.wr_lo = htonl(V_WR_LEN(flits) | V_WR_GEN(gen) | - V_WR_TID(q->token)); - wr_gen2(d, gen); - kfree_skb(skb); - return; - } - - flits = 2; - } - - sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; - sgl_flits = make_sgl(skb, sgp, skb->data, skb_headlen(skb), adap->pdev); - - write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, gen, - htonl(V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) | compl), - htonl(V_WR_TID(q->token))); -} - -static inline void t3_stop_tx_queue(struct netdev_queue *txq, - struct sge_qset *qs, struct sge_txq *q) -{ - netif_tx_stop_queue(txq); - set_bit(TXQ_ETH, &qs->txq_stopped); - q->stops++; -} - -/** - * eth_xmit - add a packet to the Ethernet Tx queue - * @skb: the packet - * @dev: the egress net device - * - * Add a packet to an SGE Tx queue. Runs with softirqs disabled. - */ -netdev_tx_t t3_eth_xmit(struct sk_buff *skb, struct net_device *dev) -{ - int qidx; - unsigned int ndesc, pidx, credits, gen, compl; - const struct port_info *pi = netdev_priv(dev); - struct adapter *adap = pi->adapter; - struct netdev_queue *txq; - struct sge_qset *qs; - struct sge_txq *q; - - /* - * The chip min packet length is 9 octets but play safe and reject - * anything shorter than an Ethernet header. - */ - if (unlikely(skb->len < ETH_HLEN)) { - dev_kfree_skb(skb); - return NETDEV_TX_OK; - } - - qidx = skb_get_queue_mapping(skb); - qs = &pi->qs[qidx]; - q = &qs->txq[TXQ_ETH]; - txq = netdev_get_tx_queue(dev, qidx); - - reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); - - credits = q->size - q->in_use; - ndesc = calc_tx_descs(skb); - - if (unlikely(credits < ndesc)) { - t3_stop_tx_queue(txq, qs, q); - dev_err(&adap->pdev->dev, - "%s: Tx ring %u full while queue awake!\n", - dev->name, q->cntxt_id & 7); - return NETDEV_TX_BUSY; - } - - q->in_use += ndesc; - if (unlikely(credits - ndesc < q->stop_thres)) { - t3_stop_tx_queue(txq, qs, q); - - if (should_restart_tx(q) && - test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { - q->restarts++; - netif_tx_start_queue(txq); - } - } - - gen = q->gen; - q->unacked += ndesc; - compl = (q->unacked & 8) << (S_WR_COMPL - 3); - q->unacked &= 7; - pidx = q->pidx; - q->pidx += ndesc; - if (q->pidx >= q->size) { - q->pidx -= q->size; - q->gen ^= 1; - } - - /* update port statistics */ - if (skb->ip_summed == CHECKSUM_COMPLETE) - qs->port_stats[SGE_PSTAT_TX_CSUM]++; - if (skb_shinfo(skb)->gso_size) - qs->port_stats[SGE_PSTAT_TSO]++; - if (vlan_tx_tag_present(skb)) - qs->port_stats[SGE_PSTAT_VLANINS]++; - - /* - * We do not use Tx completion interrupts to free DMAd Tx packets. - * This is good for performance but means that we rely on new Tx - * packets arriving to run the destructors of completed packets, - * which open up space in their sockets' send queues. Sometimes - * we do not get such new packets causing Tx to stall. A single - * UDP transmitter is a good example of this situation. We have - * a clean up timer that periodically reclaims completed packets - * but it doesn't run often enough (nor do we want it to) to prevent - * lengthy stalls. A solution to this problem is to run the - * destructor early, after the packet is queued but before it's DMAd. - * A cons is that we lie to socket memory accounting, but the amount - * of extra memory is reasonable (limited by the number of Tx - * descriptors), the packets do actually get freed quickly by new - * packets almost always, and for protocols like TCP that wait for - * acks to really free up the data the extra memory is even less. - * On the positive side we run the destructors on the sending CPU - * rather than on a potentially different completing CPU, usually a - * good thing. We also run them without holding our Tx queue lock, - * unlike what reclaim_completed_tx() would otherwise do. - * - * Run the destructor before telling the DMA engine about the packet - * to make sure it doesn't complete and get freed prematurely. - */ - if (likely(!skb_shared(skb))) - skb_orphan(skb); - - write_tx_pkt_wr(adap, skb, pi, pidx, gen, q, ndesc, compl); - check_ring_tx_db(adap, q); - return NETDEV_TX_OK; -} - -/** - * write_imm - write a packet into a Tx descriptor as immediate data - * @d: the Tx descriptor to write - * @skb: the packet - * @len: the length of packet data to write as immediate data - * @gen: the generation bit value to write - * - * Writes a packet as immediate data into a Tx descriptor. The packet - * contains a work request at its beginning. We must write the packet - * carefully so the SGE doesn't read it accidentally before it's written - * in its entirety. - */ -static inline void write_imm(struct tx_desc *d, struct sk_buff *skb, - unsigned int len, unsigned int gen) -{ - struct work_request_hdr *from = (struct work_request_hdr *)skb->data; - struct work_request_hdr *to = (struct work_request_hdr *)d; - - if (likely(!skb->data_len)) - memcpy(&to[1], &from[1], len - sizeof(*from)); - else - skb_copy_bits(skb, sizeof(*from), &to[1], len - sizeof(*from)); - - to->wr_hi = from->wr_hi | htonl(F_WR_SOP | F_WR_EOP | - V_WR_BCNTLFLT(len & 7)); - wmb(); - to->wr_lo = from->wr_lo | htonl(V_WR_GEN(gen) | - V_WR_LEN((len + 7) / 8)); - wr_gen2(d, gen); - kfree_skb(skb); -} - -/** - * check_desc_avail - check descriptor availability on a send queue - * @adap: the adapter - * @q: the send queue - * @skb: the packet needing the descriptors - * @ndesc: the number of Tx descriptors needed - * @qid: the Tx queue number in its queue set (TXQ_OFLD or TXQ_CTRL) - * - * Checks if the requested number of Tx descriptors is available on an - * SGE send queue. If the queue is already suspended or not enough - * descriptors are available the packet is queued for later transmission. - * Must be called with the Tx queue locked. - * - * Returns 0 if enough descriptors are available, 1 if there aren't - * enough descriptors and the packet has been queued, and 2 if the caller - * needs to retry because there weren't enough descriptors at the - * beginning of the call but some freed up in the mean time. - */ -static inline int check_desc_avail(struct adapter *adap, struct sge_txq *q, - struct sk_buff *skb, unsigned int ndesc, - unsigned int qid) -{ - if (unlikely(!skb_queue_empty(&q->sendq))) { - addq_exit:__skb_queue_tail(&q->sendq, skb); - return 1; - } - if (unlikely(q->size - q->in_use < ndesc)) { - struct sge_qset *qs = txq_to_qset(q, qid); - - set_bit(qid, &qs->txq_stopped); - smp_mb__after_clear_bit(); - - if (should_restart_tx(q) && - test_and_clear_bit(qid, &qs->txq_stopped)) - return 2; - - q->stops++; - goto addq_exit; - } - return 0; -} - -/** - * reclaim_completed_tx_imm - reclaim completed control-queue Tx descs - * @q: the SGE control Tx queue - * - * This is a variant of reclaim_completed_tx() that is used for Tx queues - * that send only immediate data (presently just the control queues) and - * thus do not have any sk_buffs to release. - */ -static inline void reclaim_completed_tx_imm(struct sge_txq *q) -{ - unsigned int reclaim = q->processed - q->cleaned; - - q->in_use -= reclaim; - q->cleaned += reclaim; -} - -static inline int immediate(const struct sk_buff *skb) -{ - return skb->len <= WR_LEN; -} - -/** - * ctrl_xmit - send a packet through an SGE control Tx queue - * @adap: the adapter - * @q: the control queue - * @skb: the packet - * - * Send a packet through an SGE control Tx queue. Packets sent through - * a control queue must fit entirely as immediate data in a single Tx - * descriptor and have no page fragments. - */ -static int ctrl_xmit(struct adapter *adap, struct sge_txq *q, - struct sk_buff *skb) -{ - int ret; - struct work_request_hdr *wrp = (struct work_request_hdr *)skb->data; - - if (unlikely(!immediate(skb))) { - WARN_ON(1); - dev_kfree_skb(skb); - return NET_XMIT_SUCCESS; - } - - wrp->wr_hi |= htonl(F_WR_SOP | F_WR_EOP); - wrp->wr_lo = htonl(V_WR_TID(q->token)); - - spin_lock(&q->lock); - again:reclaim_completed_tx_imm(q); - - ret = check_desc_avail(adap, q, skb, 1, TXQ_CTRL); - if (unlikely(ret)) { - if (ret == 1) { - spin_unlock(&q->lock); - return NET_XMIT_CN; - } - goto again; - } - - write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); - - q->in_use++; - if (++q->pidx >= q->size) { - q->pidx = 0; - q->gen ^= 1; - } - spin_unlock(&q->lock); - wmb(); - t3_write_reg(adap, A_SG_KDOORBELL, - F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); - return NET_XMIT_SUCCESS; -} - -/** - * restart_ctrlq - restart a suspended control queue - * @qs: the queue set cotaining the control queue - * - * Resumes transmission on a suspended Tx control queue. - */ -static void restart_ctrlq(unsigned long data) -{ - struct sk_buff *skb; - struct sge_qset *qs = (struct sge_qset *)data; - struct sge_txq *q = &qs->txq[TXQ_CTRL]; - - spin_lock(&q->lock); - again:reclaim_completed_tx_imm(q); - - while (q->in_use < q->size && - (skb = __skb_dequeue(&q->sendq)) != NULL) { - - write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); - - if (++q->pidx >= q->size) { - q->pidx = 0; - q->gen ^= 1; - } - q->in_use++; - } - - if (!skb_queue_empty(&q->sendq)) { - set_bit(TXQ_CTRL, &qs->txq_stopped); - smp_mb__after_clear_bit(); - - if (should_restart_tx(q) && - test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) - goto again; - q->stops++; - } - - spin_unlock(&q->lock); - wmb(); - t3_write_reg(qs->adap, A_SG_KDOORBELL, - F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); -} - -/* - * Send a management message through control queue 0 - */ -int t3_mgmt_tx(struct adapter *adap, struct sk_buff *skb) -{ - int ret; - local_bh_disable(); - ret = ctrl_xmit(adap, &adap->sge.qs[0].txq[TXQ_CTRL], skb); - local_bh_enable(); - - return ret; -} - -/** - * deferred_unmap_destructor - unmap a packet when it is freed - * @skb: the packet - * - * This is the packet destructor used for Tx packets that need to remain - * mapped until they are freed rather than until their Tx descriptors are - * freed. - */ -static void deferred_unmap_destructor(struct sk_buff *skb) -{ - int i; - const dma_addr_t *p; - const struct skb_shared_info *si; - const struct deferred_unmap_info *dui; - - dui = (struct deferred_unmap_info *)skb->head; - p = dui->addr; - - if (skb->tail - skb->transport_header) - pci_unmap_single(dui->pdev, *p++, - skb->tail - skb->transport_header, - PCI_DMA_TODEVICE); - - si = skb_shinfo(skb); - for (i = 0; i < si->nr_frags; i++) - pci_unmap_page(dui->pdev, *p++, si->frags[i].size, - PCI_DMA_TODEVICE); -} - -static void setup_deferred_unmapping(struct sk_buff *skb, struct pci_dev *pdev, - const struct sg_ent *sgl, int sgl_flits) -{ - dma_addr_t *p; - struct deferred_unmap_info *dui; - - dui = (struct deferred_unmap_info *)skb->head; - dui->pdev = pdev; - for (p = dui->addr; sgl_flits >= 3; sgl++, sgl_flits -= 3) { - *p++ = be64_to_cpu(sgl->addr[0]); - *p++ = be64_to_cpu(sgl->addr[1]); - } - if (sgl_flits) - *p = be64_to_cpu(sgl->addr[0]); -} - -/** - * write_ofld_wr - write an offload work request - * @adap: the adapter - * @skb: the packet to send - * @q: the Tx queue - * @pidx: index of the first Tx descriptor to write - * @gen: the generation value to use - * @ndesc: number of descriptors the packet will occupy - * - * Write an offload work request to send the supplied packet. The packet - * data already carry the work request with most fields populated. - */ -static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb, - struct sge_txq *q, unsigned int pidx, - unsigned int gen, unsigned int ndesc) -{ - unsigned int sgl_flits, flits; - struct work_request_hdr *from; - struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; - struct tx_desc *d = &q->desc[pidx]; - - if (immediate(skb)) { - q->sdesc[pidx].skb = NULL; - write_imm(d, skb, skb->len, gen); - return; - } - - /* Only TX_DATA builds SGLs */ - - from = (struct work_request_hdr *)skb->data; - memcpy(&d->flit[1], &from[1], - skb_transport_offset(skb) - sizeof(*from)); - - flits = skb_transport_offset(skb) / 8; - sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; - sgl_flits = make_sgl(skb, sgp, skb_transport_header(skb), - skb->tail - skb->transport_header, - adap->pdev); - if (need_skb_unmap()) { - setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits); - skb->destructor = deferred_unmap_destructor; - } - - write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, - gen, from->wr_hi, from->wr_lo); -} - -/** - * calc_tx_descs_ofld - calculate # of Tx descriptors for an offload packet - * @skb: the packet - * - * Returns the number of Tx descriptors needed for the given offload - * packet. These packets are already fully constructed. - */ -static inline unsigned int calc_tx_descs_ofld(const struct sk_buff *skb) -{ - unsigned int flits, cnt; - - if (skb->len <= WR_LEN) - return 1; /* packet fits as immediate data */ - - flits = skb_transport_offset(skb) / 8; /* headers */ - cnt = skb_shinfo(skb)->nr_frags; - if (skb->tail != skb->transport_header) - cnt++; - return flits_to_desc(flits + sgl_len(cnt)); -} - -/** - * ofld_xmit - send a packet through an offload queue - * @adap: the adapter - * @q: the Tx offload queue - * @skb: the packet - * - * Send an offload packet through an SGE offload queue. - */ -static int ofld_xmit(struct adapter *adap, struct sge_txq *q, - struct sk_buff *skb) -{ - int ret; - unsigned int ndesc = calc_tx_descs_ofld(skb), pidx, gen; - - spin_lock(&q->lock); -again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); - - ret = check_desc_avail(adap, q, skb, ndesc, TXQ_OFLD); - if (unlikely(ret)) { - if (ret == 1) { - skb->priority = ndesc; /* save for restart */ - spin_unlock(&q->lock); - return NET_XMIT_CN; - } - goto again; - } - - gen = q->gen; - q->in_use += ndesc; - pidx = q->pidx; - q->pidx += ndesc; - if (q->pidx >= q->size) { - q->pidx -= q->size; - q->gen ^= 1; - } - spin_unlock(&q->lock); - - write_ofld_wr(adap, skb, q, pidx, gen, ndesc); - check_ring_tx_db(adap, q); - return NET_XMIT_SUCCESS; -} - -/** - * restart_offloadq - restart a suspended offload queue - * @qs: the queue set cotaining the offload queue - * - * Resumes transmission on a suspended Tx offload queue. - */ -static void restart_offloadq(unsigned long data) -{ - struct sk_buff *skb; - struct sge_qset *qs = (struct sge_qset *)data; - struct sge_txq *q = &qs->txq[TXQ_OFLD]; - const struct port_info *pi = netdev_priv(qs->netdev); - struct adapter *adap = pi->adapter; - - spin_lock(&q->lock); -again: reclaim_completed_tx(adap, q, TX_RECLAIM_CHUNK); - - while ((skb = skb_peek(&q->sendq)) != NULL) { - unsigned int gen, pidx; - unsigned int ndesc = skb->priority; - - if (unlikely(q->size - q->in_use < ndesc)) { - set_bit(TXQ_OFLD, &qs->txq_stopped); - smp_mb__after_clear_bit(); - - if (should_restart_tx(q) && - test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) - goto again; - q->stops++; - break; - } - - gen = q->gen; - q->in_use += ndesc; - pidx = q->pidx; - q->pidx += ndesc; - if (q->pidx >= q->size) { - q->pidx -= q->size; - q->gen ^= 1; - } - __skb_unlink(skb, &q->sendq); - spin_unlock(&q->lock); - - write_ofld_wr(adap, skb, q, pidx, gen, ndesc); - spin_lock(&q->lock); - } - spin_unlock(&q->lock); - -#if USE_GTS - set_bit(TXQ_RUNNING, &q->flags); - set_bit(TXQ_LAST_PKT_DB, &q->flags); -#endif - wmb(); - t3_write_reg(adap, A_SG_KDOORBELL, - F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); -} - -/** - * queue_set - return the queue set a packet should use - * @skb: the packet - * - * Maps a packet to the SGE queue set it should use. The desired queue - * set is carried in bits 1-3 in the packet's priority. - */ -static inline int queue_set(const struct sk_buff *skb) -{ - return skb->priority >> 1; -} - -/** - * is_ctrl_pkt - return whether an offload packet is a control packet - * @skb: the packet - * - * Determines whether an offload packet should use an OFLD or a CTRL - * Tx queue. This is indicated by bit 0 in the packet's priority. - */ -static inline int is_ctrl_pkt(const struct sk_buff *skb) -{ - return skb->priority & 1; -} - -/** - * t3_offload_tx - send an offload packet - * @tdev: the offload device to send to - * @skb: the packet - * - * Sends an offload packet. We use the packet priority to select the - * appropriate Tx queue as follows: bit 0 indicates whether the packet - * should be sent as regular or control, bits 1-3 select the queue set. - */ -int t3_offload_tx(struct t3cdev *tdev, struct sk_buff *skb) -{ - struct adapter *adap = tdev2adap(tdev); - struct sge_qset *qs = &adap->sge.qs[queue_set(skb)]; - - if (unlikely(is_ctrl_pkt(skb))) - return ctrl_xmit(adap, &qs->txq[TXQ_CTRL], skb); - - return ofld_xmit(adap, &qs->txq[TXQ_OFLD], skb); -} - -/** - * offload_enqueue - add an offload packet to an SGE offload receive queue - * @q: the SGE response queue - * @skb: the packet - * - * Add a new offload packet to an SGE response queue's offload packet - * queue. If the packet is the first on the queue it schedules the RX - * softirq to process the queue. - */ -static inline void offload_enqueue(struct sge_rspq *q, struct sk_buff *skb) -{ - int was_empty = skb_queue_empty(&q->rx_queue); - - __skb_queue_tail(&q->rx_queue, skb); - - if (was_empty) { - struct sge_qset *qs = rspq_to_qset(q); - - napi_schedule(&qs->napi); - } -} - -/** - * deliver_partial_bundle - deliver a (partial) bundle of Rx offload pkts - * @tdev: the offload device that will be receiving the packets - * @q: the SGE response queue that assembled the bundle - * @skbs: the partial bundle - * @n: the number of packets in the bundle - * - * Delivers a (partial) bundle of Rx offload packets to an offload device. - */ -static inline void deliver_partial_bundle(struct t3cdev *tdev, - struct sge_rspq *q, - struct sk_buff *skbs[], int n) -{ - if (n) { - q->offload_bundles++; - tdev->recv(tdev, skbs, n); - } -} - -/** - * ofld_poll - NAPI handler for offload packets in interrupt mode - * @dev: the network device doing the polling - * @budget: polling budget - * - * The NAPI handler for offload packets when a response queue is serviced - * by the hard interrupt handler, i.e., when it's operating in non-polling - * mode. Creates small packet batches and sends them through the offload - * receive handler. Batches need to be of modest size as we do prefetches - * on the packets in each. - */ -static int ofld_poll(struct napi_struct *napi, int budget) -{ - struct sge_qset *qs = container_of(napi, struct sge_qset, napi); - struct sge_rspq *q = &qs->rspq; - struct adapter *adapter = qs->adap; - int work_done = 0; - - while (work_done < budget) { - struct sk_buff *skb, *tmp, *skbs[RX_BUNDLE_SIZE]; - struct sk_buff_head queue; - int ngathered; - - spin_lock_irq(&q->lock); - __skb_queue_head_init(&queue); - skb_queue_splice_init(&q->rx_queue, &queue); - if (skb_queue_empty(&queue)) { - napi_complete(napi); - spin_unlock_irq(&q->lock); - return work_done; - } - spin_unlock_irq(&q->lock); - - ngathered = 0; - skb_queue_walk_safe(&queue, skb, tmp) { - if (work_done >= budget) - break; - work_done++; - - __skb_unlink(skb, &queue); - prefetch(skb->data); - skbs[ngathered] = skb; - if (++ngathered == RX_BUNDLE_SIZE) { - q->offload_bundles++; - adapter->tdev.recv(&adapter->tdev, skbs, - ngathered); - ngathered = 0; - } - } - if (!skb_queue_empty(&queue)) { - /* splice remaining packets back onto Rx queue */ - spin_lock_irq(&q->lock); - skb_queue_splice(&queue, &q->rx_queue); - spin_unlock_irq(&q->lock); - } - deliver_partial_bundle(&adapter->tdev, q, skbs, ngathered); - } - - return work_done; -} - -/** - * rx_offload - process a received offload packet - * @tdev: the offload device receiving the packet - * @rq: the response queue that received the packet - * @skb: the packet - * @rx_gather: a gather list of packets if we are building a bundle - * @gather_idx: index of the next available slot in the bundle - * - * Process an ingress offload pakcet and add it to the offload ingress - * queue. Returns the index of the next available slot in the bundle. - */ -static inline int rx_offload(struct t3cdev *tdev, struct sge_rspq *rq, - struct sk_buff *skb, struct sk_buff *rx_gather[], - unsigned int gather_idx) -{ - skb_reset_mac_header(skb); - skb_reset_network_header(skb); - skb_reset_transport_header(skb); - - if (rq->polling) { - rx_gather[gather_idx++] = skb; - if (gather_idx == RX_BUNDLE_SIZE) { - tdev->recv(tdev, rx_gather, RX_BUNDLE_SIZE); - gather_idx = 0; - rq->offload_bundles++; - } - } else - offload_enqueue(rq, skb); - - return gather_idx; -} - -/** - * restart_tx - check whether to restart suspended Tx queues - * @qs: the queue set to resume - * - * Restarts suspended Tx queues of an SGE queue set if they have enough - * free resources to resume operation. - */ -static void restart_tx(struct sge_qset *qs) -{ - if (test_bit(TXQ_ETH, &qs->txq_stopped) && - should_restart_tx(&qs->txq[TXQ_ETH]) && - test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { - qs->txq[TXQ_ETH].restarts++; - if (netif_running(qs->netdev)) - netif_tx_wake_queue(qs->tx_q); - } - - if (test_bit(TXQ_OFLD, &qs->txq_stopped) && - should_restart_tx(&qs->txq[TXQ_OFLD]) && - test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) { - qs->txq[TXQ_OFLD].restarts++; - tasklet_schedule(&qs->txq[TXQ_OFLD].qresume_tsk); - } - if (test_bit(TXQ_CTRL, &qs->txq_stopped) && - should_restart_tx(&qs->txq[TXQ_CTRL]) && - test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) { - qs->txq[TXQ_CTRL].restarts++; - tasklet_schedule(&qs->txq[TXQ_CTRL].qresume_tsk); - } -} - -/** - * cxgb3_arp_process - process an ARP request probing a private IP address - * @adapter: the adapter - * @skb: the skbuff containing the ARP request - * - * Check if the ARP request is probing the private IP address - * dedicated to iSCSI, generate an ARP reply if so. - */ -static void cxgb3_arp_process(struct port_info *pi, struct sk_buff *skb) -{ - struct net_device *dev = skb->dev; - struct arphdr *arp; - unsigned char *arp_ptr; - unsigned char *sha; - __be32 sip, tip; - - if (!dev) - return; - - skb_reset_network_header(skb); - arp = arp_hdr(skb); - - if (arp->ar_op != htons(ARPOP_REQUEST)) - return; - - arp_ptr = (unsigned char *)(arp + 1); - sha = arp_ptr; - arp_ptr += dev->addr_len; - memcpy(&sip, arp_ptr, sizeof(sip)); - arp_ptr += sizeof(sip); - arp_ptr += dev->addr_len; - memcpy(&tip, arp_ptr, sizeof(tip)); - - if (tip != pi->iscsi_ipv4addr) - return; - - arp_send(ARPOP_REPLY, ETH_P_ARP, sip, dev, tip, sha, - pi->iscsic.mac_addr, sha); - -} - -static inline int is_arp(struct sk_buff *skb) -{ - return skb->protocol == htons(ETH_P_ARP); -} - -static void cxgb3_process_iscsi_prov_pack(struct port_info *pi, - struct sk_buff *skb) -{ - if (is_arp(skb)) { - cxgb3_arp_process(pi, skb); - return; - } - - if (pi->iscsic.recv) - pi->iscsic.recv(pi, skb); - -} - -/** - * rx_eth - process an ingress ethernet packet - * @adap: the adapter - * @rq: the response queue that received the packet - * @skb: the packet - * @pad: amount of padding at the start of the buffer - * - * Process an ingress ethernet pakcet and deliver it to the stack. - * The padding is 2 if the packet was delivered in an Rx buffer and 0 - * if it was immediate data in a response. - */ -static void rx_eth(struct adapter *adap, struct sge_rspq *rq, - struct sk_buff *skb, int pad, int lro) -{ - struct cpl_rx_pkt *p = (struct cpl_rx_pkt *)(skb->data + pad); - struct sge_qset *qs = rspq_to_qset(rq); - struct port_info *pi; - - skb_pull(skb, sizeof(*p) + pad); - skb->protocol = eth_type_trans(skb, adap->port[p->iff]); - pi = netdev_priv(skb->dev); - if ((skb->dev->features & NETIF_F_RXCSUM) && p->csum_valid && - p->csum == htons(0xffff) && !p->fragment) { - qs->port_stats[SGE_PSTAT_RX_CSUM_GOOD]++; - skb->ip_summed = CHECKSUM_UNNECESSARY; - } else - skb_checksum_none_assert(skb); - skb_record_rx_queue(skb, qs - &adap->sge.qs[pi->first_qset]); - - if (p->vlan_valid) { - qs->port_stats[SGE_PSTAT_VLANEX]++; - __vlan_hwaccel_put_tag(skb, ntohs(p->vlan)); - } - if (rq->polling) { - if (lro) - napi_gro_receive(&qs->napi, skb); - else { - if (unlikely(pi->iscsic.flags)) - cxgb3_process_iscsi_prov_pack(pi, skb); - netif_receive_skb(skb); - } - } else - netif_rx(skb); -} - -static inline int is_eth_tcp(u32 rss) -{ - return G_HASHTYPE(ntohl(rss)) == RSS_HASH_4_TUPLE; -} - -/** - * lro_add_page - add a page chunk to an LRO session - * @adap: the adapter - * @qs: the associated queue set - * @fl: the free list containing the page chunk to add - * @len: packet length - * @complete: Indicates the last fragment of a frame - * - * Add a received packet contained in a page chunk to an existing LRO - * session. - */ -static void lro_add_page(struct adapter *adap, struct sge_qset *qs, - struct sge_fl *fl, int len, int complete) -{ - struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; - struct port_info *pi = netdev_priv(qs->netdev); - struct sk_buff *skb = NULL; - struct cpl_rx_pkt *cpl; - struct skb_frag_struct *rx_frag; - int nr_frags; - int offset = 0; - - if (!qs->nomem) { - skb = napi_get_frags(&qs->napi); - qs->nomem = !skb; - } - - fl->credits--; - - pci_dma_sync_single_for_cpu(adap->pdev, - dma_unmap_addr(sd, dma_addr), - fl->buf_size - SGE_PG_RSVD, - PCI_DMA_FROMDEVICE); - - (*sd->pg_chunk.p_cnt)--; - if (!*sd->pg_chunk.p_cnt && sd->pg_chunk.page != fl->pg_chunk.page) - pci_unmap_page(adap->pdev, - sd->pg_chunk.mapping, - fl->alloc_size, - PCI_DMA_FROMDEVICE); - - if (!skb) { - put_page(sd->pg_chunk.page); - if (complete) - qs->nomem = 0; - return; - } - - rx_frag = skb_shinfo(skb)->frags; - nr_frags = skb_shinfo(skb)->nr_frags; - - if (!nr_frags) { - offset = 2 + sizeof(struct cpl_rx_pkt); - cpl = qs->lro_va = sd->pg_chunk.va + 2; - - if ((qs->netdev->features & NETIF_F_RXCSUM) && - cpl->csum_valid && cpl->csum == htons(0xffff)) { - skb->ip_summed = CHECKSUM_UNNECESSARY; - qs->port_stats[SGE_PSTAT_RX_CSUM_GOOD]++; - } else - skb->ip_summed = CHECKSUM_NONE; - } else - cpl = qs->lro_va; - - len -= offset; - - rx_frag += nr_frags; - rx_frag->page = sd->pg_chunk.page; - rx_frag->page_offset = sd->pg_chunk.offset + offset; - rx_frag->size = len; - - skb->len += len; - skb->data_len += len; - skb->truesize += len; - skb_shinfo(skb)->nr_frags++; - - if (!complete) - return; - - skb_record_rx_queue(skb, qs - &adap->sge.qs[pi->first_qset]); - - if (cpl->vlan_valid) - __vlan_hwaccel_put_tag(skb, ntohs(cpl->vlan)); - napi_gro_frags(&qs->napi); -} - -/** - * handle_rsp_cntrl_info - handles control information in a response - * @qs: the queue set corresponding to the response - * @flags: the response control flags - * - * Handles the control information of an SGE response, such as GTS - * indications and completion credits for the queue set's Tx queues. - * HW coalesces credits, we don't do any extra SW coalescing. - */ -static inline void handle_rsp_cntrl_info(struct sge_qset *qs, u32 flags) -{ - unsigned int credits; - -#if USE_GTS - if (flags & F_RSPD_TXQ0_GTS) - clear_bit(TXQ_RUNNING, &qs->txq[TXQ_ETH].flags); -#endif - - credits = G_RSPD_TXQ0_CR(flags); - if (credits) - qs->txq[TXQ_ETH].processed += credits; - - credits = G_RSPD_TXQ2_CR(flags); - if (credits) - qs->txq[TXQ_CTRL].processed += credits; - -# if USE_GTS - if (flags & F_RSPD_TXQ1_GTS) - clear_bit(TXQ_RUNNING, &qs->txq[TXQ_OFLD].flags); -# endif - credits = G_RSPD_TXQ1_CR(flags); - if (credits) - qs->txq[TXQ_OFLD].processed += credits; -} - -/** - * check_ring_db - check if we need to ring any doorbells - * @adapter: the adapter - * @qs: the queue set whose Tx queues are to be examined - * @sleeping: indicates which Tx queue sent GTS - * - * Checks if some of a queue set's Tx queues need to ring their doorbells - * to resume transmission after idling while they still have unprocessed - * descriptors. - */ -static void check_ring_db(struct adapter *adap, struct sge_qset *qs, - unsigned int sleeping) -{ - if (sleeping & F_RSPD_TXQ0_GTS) { - struct sge_txq *txq = &qs->txq[TXQ_ETH]; - - if (txq->cleaned + txq->in_use != txq->processed && - !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { - set_bit(TXQ_RUNNING, &txq->flags); - t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | - V_EGRCNTX(txq->cntxt_id)); - } - } - - if (sleeping & F_RSPD_TXQ1_GTS) { - struct sge_txq *txq = &qs->txq[TXQ_OFLD]; - - if (txq->cleaned + txq->in_use != txq->processed && - !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { - set_bit(TXQ_RUNNING, &txq->flags); - t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | - V_EGRCNTX(txq->cntxt_id)); - } - } -} - -/** - * is_new_response - check if a response is newly written - * @r: the response descriptor - * @q: the response queue - * - * Returns true if a response descriptor contains a yet unprocessed - * response. - */ -static inline int is_new_response(const struct rsp_desc *r, - const struct sge_rspq *q) -{ - return (r->intr_gen & F_RSPD_GEN2) == q->gen; -} - -static inline void clear_rspq_bufstate(struct sge_rspq * const q) -{ - q->pg_skb = NULL; - q->rx_recycle_buf = 0; -} - -#define RSPD_GTS_MASK (F_RSPD_TXQ0_GTS | F_RSPD_TXQ1_GTS) -#define RSPD_CTRL_MASK (RSPD_GTS_MASK | \ - V_RSPD_TXQ0_CR(M_RSPD_TXQ0_CR) | \ - V_RSPD_TXQ1_CR(M_RSPD_TXQ1_CR) | \ - V_RSPD_TXQ2_CR(M_RSPD_TXQ2_CR)) - -/* How long to delay the next interrupt in case of memory shortage, in 0.1us. */ -#define NOMEM_INTR_DELAY 2500 - -/** - * process_responses - process responses from an SGE response queue - * @adap: the adapter - * @qs: the queue set to which the response queue belongs - * @budget: how many responses can be processed in this round - * - * Process responses from an SGE response queue up to the supplied budget. - * Responses include received packets as well as credits and other events - * for the queues that belong to the response queue's queue set. - * A negative budget is effectively unlimited. - * - * Additionally choose the interrupt holdoff time for the next interrupt - * on this queue. If the system is under memory shortage use a fairly - * long delay to help recovery. - */ -static int process_responses(struct adapter *adap, struct sge_qset *qs, - int budget) -{ - struct sge_rspq *q = &qs->rspq; - struct rsp_desc *r = &q->desc[q->cidx]; - int budget_left = budget; - unsigned int sleeping = 0; - struct sk_buff *offload_skbs[RX_BUNDLE_SIZE]; - int ngathered = 0; - - q->next_holdoff = q->holdoff_tmr; - - while (likely(budget_left && is_new_response(r, q))) { - int packet_complete, eth, ethpad = 2; - int lro = !!(qs->netdev->features & NETIF_F_GRO); - struct sk_buff *skb = NULL; - u32 len, flags; - __be32 rss_hi, rss_lo; - - rmb(); - eth = r->rss_hdr.opcode == CPL_RX_PKT; - rss_hi = *(const __be32 *)r; - rss_lo = r->rss_hdr.rss_hash_val; - flags = ntohl(r->flags); - - if (unlikely(flags & F_RSPD_ASYNC_NOTIF)) { - skb = alloc_skb(AN_PKT_SIZE, GFP_ATOMIC); - if (!skb) - goto no_mem; - - memcpy(__skb_put(skb, AN_PKT_SIZE), r, AN_PKT_SIZE); - skb->data[0] = CPL_ASYNC_NOTIF; - rss_hi = htonl(CPL_ASYNC_NOTIF << 24); - q->async_notif++; - } else if (flags & F_RSPD_IMM_DATA_VALID) { - skb = get_imm_packet(r); - if (unlikely(!skb)) { -no_mem: - q->next_holdoff = NOMEM_INTR_DELAY; - q->nomem++; - /* consume one credit since we tried */ - budget_left--; - break; - } - q->imm_data++; - ethpad = 0; - } else if ((len = ntohl(r->len_cq)) != 0) { - struct sge_fl *fl; - - lro &= eth && is_eth_tcp(rss_hi); - - fl = (len & F_RSPD_FLQ) ? &qs->fl[1] : &qs->fl[0]; - if (fl->use_pages) { - void *addr = fl->sdesc[fl->cidx].pg_chunk.va; - - prefetch(addr); -#if L1_CACHE_BYTES < 128 - prefetch(addr + L1_CACHE_BYTES); -#endif - __refill_fl(adap, fl); - if (lro > 0) { - lro_add_page(adap, qs, fl, - G_RSPD_LEN(len), - flags & F_RSPD_EOP); - goto next_fl; - } - - skb = get_packet_pg(adap, fl, q, - G_RSPD_LEN(len), - eth ? - SGE_RX_DROP_THRES : 0); - q->pg_skb = skb; - } else - skb = get_packet(adap, fl, G_RSPD_LEN(len), - eth ? SGE_RX_DROP_THRES : 0); - if (unlikely(!skb)) { - if (!eth) - goto no_mem; - q->rx_drops++; - } else if (unlikely(r->rss_hdr.opcode == CPL_TRACE_PKT)) - __skb_pull(skb, 2); -next_fl: - if (++fl->cidx == fl->size) - fl->cidx = 0; - } else - q->pure_rsps++; - - if (flags & RSPD_CTRL_MASK) { - sleeping |= flags & RSPD_GTS_MASK; - handle_rsp_cntrl_info(qs, flags); - } - - r++; - if (unlikely(++q->cidx == q->size)) { - q->cidx = 0; - q->gen ^= 1; - r = q->desc; - } - prefetch(r); - - if (++q->credits >= (q->size / 4)) { - refill_rspq(adap, q, q->credits); - q->credits = 0; - } - - packet_complete = flags & - (F_RSPD_EOP | F_RSPD_IMM_DATA_VALID | - F_RSPD_ASYNC_NOTIF); - - if (skb != NULL && packet_complete) { - if (eth) - rx_eth(adap, q, skb, ethpad, lro); - else { - q->offload_pkts++; - /* Preserve the RSS info in csum & priority */ - skb->csum = rss_hi; - skb->priority = rss_lo; - ngathered = rx_offload(&adap->tdev, q, skb, - offload_skbs, - ngathered); - } - - if (flags & F_RSPD_EOP) - clear_rspq_bufstate(q); - } - --budget_left; - } - - deliver_partial_bundle(&adap->tdev, q, offload_skbs, ngathered); - - if (sleeping) - check_ring_db(adap, qs, sleeping); - - smp_mb(); /* commit Tx queue .processed updates */ - if (unlikely(qs->txq_stopped != 0)) - restart_tx(qs); - - budget -= budget_left; - return budget; -} - -static inline int is_pure_response(const struct rsp_desc *r) -{ - __be32 n = r->flags & htonl(F_RSPD_ASYNC_NOTIF | F_RSPD_IMM_DATA_VALID); - - return (n | r->len_cq) == 0; -} - -/** - * napi_rx_handler - the NAPI handler for Rx processing - * @napi: the napi instance - * @budget: how many packets we can process in this round - * - * Handler for new data events when using NAPI. - */ -static int napi_rx_handler(struct napi_struct *napi, int budget) -{ - struct sge_qset *qs = container_of(napi, struct sge_qset, napi); - struct adapter *adap = qs->adap; - int work_done = process_responses(adap, qs, budget); - - if (likely(work_done < budget)) { - napi_complete(napi); - - /* - * Because we don't atomically flush the following - * write it is possible that in very rare cases it can - * reach the device in a way that races with a new - * response being written plus an error interrupt - * causing the NAPI interrupt handler below to return - * unhandled status to the OS. To protect against - * this would require flushing the write and doing - * both the write and the flush with interrupts off. - * Way too expensive and unjustifiable given the - * rarity of the race. - * - * The race cannot happen at all with MSI-X. - */ - t3_write_reg(adap, A_SG_GTS, V_RSPQ(qs->rspq.cntxt_id) | - V_NEWTIMER(qs->rspq.next_holdoff) | - V_NEWINDEX(qs->rspq.cidx)); - } - return work_done; -} - -/* - * Returns true if the device is already scheduled for polling. - */ -static inline int napi_is_scheduled(struct napi_struct *napi) -{ - return test_bit(NAPI_STATE_SCHED, &napi->state); -} - -/** - * process_pure_responses - process pure responses from a response queue - * @adap: the adapter - * @qs: the queue set owning the response queue - * @r: the first pure response to process - * - * 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 under NAPI, so we handle them specially in - * the interrupt handler. 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 *adap, struct sge_qset *qs, - struct rsp_desc *r) -{ - struct sge_rspq *q = &qs->rspq; - unsigned int sleeping = 0; - - do { - u32 flags = ntohl(r->flags); - - r++; - if (unlikely(++q->cidx == q->size)) { - q->cidx = 0; - q->gen ^= 1; - r = q->desc; - } - prefetch(r); - - if (flags & RSPD_CTRL_MASK) { - sleeping |= flags & RSPD_GTS_MASK; - handle_rsp_cntrl_info(qs, flags); - } - - q->pure_rsps++; - if (++q->credits >= (q->size / 4)) { - refill_rspq(adap, q, q->credits); - q->credits = 0; - } - if (!is_new_response(r, q)) - break; - rmb(); - } while (is_pure_response(r)); - - if (sleeping) - check_ring_db(adap, qs, sleeping); - - smp_mb(); /* commit Tx queue .processed updates */ - if (unlikely(qs->txq_stopped != 0)) - restart_tx(qs); - - return is_new_response(r, q); -} - -/** - * handle_responses - decide what to do with new responses in NAPI mode - * @adap: the adapter - * @q: the response queue - * - * This is used by the NAPI interrupt handlers to decide what to do with - * new SGE responses. If there are no new responses it returns -1. If - * there are new responses and they are pure (i.e., non-data carrying) - * it handles them straight in hard interrupt context as they are very - * cheap and don't deliver any packets. Finally, if there are any data - * signaling responses it schedules the NAPI handler. Returns 1 if it - * schedules NAPI, 0 if all new responses were pure. - * - * The caller must ascertain NAPI is not already running. - */ -static inline int handle_responses(struct adapter *adap, struct sge_rspq *q) -{ - struct sge_qset *qs = rspq_to_qset(q); - struct rsp_desc *r = &q->desc[q->cidx]; - - if (!is_new_response(r, q)) - return -1; - rmb(); - if (is_pure_response(r) && process_pure_responses(adap, qs, r) == 0) { - t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | - V_NEWTIMER(q->holdoff_tmr) | V_NEWINDEX(q->cidx)); - return 0; - } - napi_schedule(&qs->napi); - return 1; -} - -/* - * The MSI-X interrupt handler for an SGE response queue for the non-NAPI case - * (i.e., response queue serviced in hard interrupt). - */ -static irqreturn_t t3_sge_intr_msix(int irq, void *cookie) -{ - struct sge_qset *qs = cookie; - struct adapter *adap = qs->adap; - struct sge_rspq *q = &qs->rspq; - - spin_lock(&q->lock); - if (process_responses(adap, qs, -1) == 0) - q->unhandled_irqs++; - t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | - V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); - spin_unlock(&q->lock); - return IRQ_HANDLED; -} - -/* - * The MSI-X interrupt handler for an SGE response queue for the NAPI case - * (i.e., response queue serviced by NAPI polling). - */ -static irqreturn_t t3_sge_intr_msix_napi(int irq, void *cookie) -{ - struct sge_qset *qs = cookie; - struct sge_rspq *q = &qs->rspq; - - spin_lock(&q->lock); - - if (handle_responses(qs->adap, q) < 0) - q->unhandled_irqs++; - spin_unlock(&q->lock); - return IRQ_HANDLED; -} - -/* - * The non-NAPI MSI interrupt handler. This needs to handle data events from - * SGE response queues as well as error and other async events as they all use - * the same MSI vector. We use one SGE response queue per port in this mode - * and protect all response queues with queue 0's lock. - */ -static irqreturn_t t3_intr_msi(int irq, void *cookie) -{ - int new_packets = 0; - struct adapter *adap = cookie; - struct sge_rspq *q = &adap->sge.qs[0].rspq; - - spin_lock(&q->lock); - - if (process_responses(adap, &adap->sge.qs[0], -1)) { - t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | - V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); - new_packets = 1; - } - - if (adap->params.nports == 2 && - process_responses(adap, &adap->sge.qs[1], -1)) { - struct sge_rspq *q1 = &adap->sge.qs[1].rspq; - - t3_write_reg(adap, A_SG_GTS, V_RSPQ(q1->cntxt_id) | - V_NEWTIMER(q1->next_holdoff) | - V_NEWINDEX(q1->cidx)); - new_packets = 1; - } - - if (!new_packets && t3_slow_intr_handler(adap) == 0) - q->unhandled_irqs++; - - spin_unlock(&q->lock); - return IRQ_HANDLED; -} - -static int rspq_check_napi(struct sge_qset *qs) -{ - struct sge_rspq *q = &qs->rspq; - - if (!napi_is_scheduled(&qs->napi) && - is_new_response(&q->desc[q->cidx], q)) { - napi_schedule(&qs->napi); - return 1; - } - return 0; -} - -/* - * The MSI interrupt handler for the NAPI case (i.e., response queues serviced - * by NAPI polling). Handles data events from SGE response queues as well as - * error and other async events as they all use the same MSI vector. We use - * one SGE response queue per port in this mode and protect all response - * queues with queue 0's lock. - */ -static irqreturn_t t3_intr_msi_napi(int irq, void *cookie) -{ - int new_packets; - struct adapter *adap = cookie; - struct sge_rspq *q = &adap->sge.qs[0].rspq; - - spin_lock(&q->lock); - - new_packets = rspq_check_napi(&adap->sge.qs[0]); - if (adap->params.nports == 2) - new_packets += rspq_check_napi(&adap->sge.qs[1]); - if (!new_packets && t3_slow_intr_handler(adap) == 0) - q->unhandled_irqs++; - - spin_unlock(&q->lock); - return IRQ_HANDLED; -} - -/* - * A helper function that processes responses and issues GTS. - */ -static inline int process_responses_gts(struct adapter *adap, - struct sge_rspq *rq) -{ - int work; - - work = process_responses(adap, rspq_to_qset(rq), -1); - t3_write_reg(adap, A_SG_GTS, V_RSPQ(rq->cntxt_id) | - V_NEWTIMER(rq->next_holdoff) | V_NEWINDEX(rq->cidx)); - return work; -} - -/* - * The legacy INTx interrupt handler. This needs to handle data events from - * SGE response queues as well as error and other async events as they all use - * the same interrupt pin. We use one SGE response queue per port in this mode - * and protect all response queues with queue 0's lock. - */ -static irqreturn_t t3_intr(int irq, void *cookie) -{ - int work_done, w0, w1; - struct adapter *adap = cookie; - struct sge_rspq *q0 = &adap->sge.qs[0].rspq; - struct sge_rspq *q1 = &adap->sge.qs[1].rspq; - - spin_lock(&q0->lock); - - w0 = is_new_response(&q0->desc[q0->cidx], q0); - w1 = adap->params.nports == 2 && - is_new_response(&q1->desc[q1->cidx], q1); - - if (likely(w0 | w1)) { - t3_write_reg(adap, A_PL_CLI, 0); - t3_read_reg(adap, A_PL_CLI); /* flush */ - - if (likely(w0)) - process_responses_gts(adap, q0); - - if (w1) - process_responses_gts(adap, q1); - - work_done = w0 | w1; - } else - work_done = t3_slow_intr_handler(adap); - - spin_unlock(&q0->lock); - return IRQ_RETVAL(work_done != 0); -} - -/* - * Interrupt handler for legacy INTx interrupts for T3B-based cards. - * Handles data events from SGE response queues as well as error and other - * async events as they all use the same interrupt pin. We use one SGE - * response queue per port in this mode and protect all response queues with - * queue 0's lock. - */ -static irqreturn_t t3b_intr(int irq, void *cookie) -{ - u32 map; - struct adapter *adap = cookie; - struct sge_rspq *q0 = &adap->sge.qs[0].rspq; - - t3_write_reg(adap, A_PL_CLI, 0); - map = t3_read_reg(adap, A_SG_DATA_INTR); - - if (unlikely(!map)) /* shared interrupt, most likely */ - return IRQ_NONE; - - spin_lock(&q0->lock); - - if (unlikely(map & F_ERRINTR)) - t3_slow_intr_handler(adap); - - if (likely(map & 1)) - process_responses_gts(adap, q0); - - if (map & 2) - process_responses_gts(adap, &adap->sge.qs[1].rspq); - - spin_unlock(&q0->lock); - return IRQ_HANDLED; -} - -/* - * NAPI interrupt handler for legacy INTx interrupts for T3B-based cards. - * Handles data events from SGE response queues as well as error and other - * async events as they all use the same interrupt pin. We use one SGE - * response queue per port in this mode and protect all response queues with - * queue 0's lock. - */ -static irqreturn_t t3b_intr_napi(int irq, void *cookie) -{ - u32 map; - struct adapter *adap = cookie; - struct sge_qset *qs0 = &adap->sge.qs[0]; - struct sge_rspq *q0 = &qs0->rspq; - - t3_write_reg(adap, A_PL_CLI, 0); - map = t3_read_reg(adap, A_SG_DATA_INTR); - - if (unlikely(!map)) /* shared interrupt, most likely */ - return IRQ_NONE; - - spin_lock(&q0->lock); - - if (unlikely(map & F_ERRINTR)) - t3_slow_intr_handler(adap); - - if (likely(map & 1)) - napi_schedule(&qs0->napi); - - if (map & 2) - napi_schedule(&adap->sge.qs[1].napi); - - spin_unlock(&q0->lock); - return IRQ_HANDLED; -} - -/** - * t3_intr_handler - select the top-level interrupt handler - * @adap: the adapter - * @polling: whether using NAPI to service response queues - * - * Selects the top-level interrupt handler based on the type of interrupts - * (MSI-X, MSI, or legacy) and whether NAPI will be used to service the - * response queues. - */ -irq_handler_t t3_intr_handler(struct adapter *adap, int polling) -{ - if (adap->flags & USING_MSIX) - return polling ? t3_sge_intr_msix_napi : t3_sge_intr_msix; - if (adap->flags & USING_MSI) - return polling ? t3_intr_msi_napi : t3_intr_msi; - if (adap->params.rev > 0) - return polling ? t3b_intr_napi : t3b_intr; - return t3_intr; -} - -#define SGE_PARERR (F_CPPARITYERROR | F_OCPARITYERROR | F_RCPARITYERROR | \ - F_IRPARITYERROR | V_ITPARITYERROR(M_ITPARITYERROR) | \ - V_FLPARITYERROR(M_FLPARITYERROR) | F_LODRBPARITYERROR | \ - F_HIDRBPARITYERROR | F_LORCQPARITYERROR | \ - F_HIRCQPARITYERROR) -#define SGE_FRAMINGERR (F_UC_REQ_FRAMINGERROR | F_R_REQ_FRAMINGERROR) -#define SGE_FATALERR (SGE_PARERR | SGE_FRAMINGERR | F_RSPQCREDITOVERFOW | \ - F_RSPQDISABLED) - -/** - * t3_sge_err_intr_handler - SGE async event interrupt handler - * @adapter: the adapter - * - * Interrupt handler for SGE asynchronous (non-data) events. - */ -void t3_sge_err_intr_handler(struct adapter *adapter) -{ - unsigned int v, status = t3_read_reg(adapter, A_SG_INT_CAUSE) & - ~F_FLEMPTY; - - if (status & SGE_PARERR) - CH_ALERT(adapter, "SGE parity error (0x%x)\n", - status & SGE_PARERR); - if (status & SGE_FRAMINGERR) - CH_ALERT(adapter, "SGE framing error (0x%x)\n", - status & SGE_FRAMINGERR); - - if (status & F_RSPQCREDITOVERFOW) - CH_ALERT(adapter, "SGE response queue credit overflow\n"); - - if (status & F_RSPQDISABLED) { - v = t3_read_reg(adapter, A_SG_RSPQ_FL_STATUS); - - CH_ALERT(adapter, - "packet delivered to disabled response queue " - "(0x%x)\n", (v >> S_RSPQ0DISABLED) & 0xff); - } - - if (status & (F_HIPIODRBDROPERR | F_LOPIODRBDROPERR)) - queue_work(cxgb3_wq, &adapter->db_drop_task); - - if (status & (F_HIPRIORITYDBFULL | F_LOPRIORITYDBFULL)) - queue_work(cxgb3_wq, &adapter->db_full_task); - - if (status & (F_HIPRIORITYDBEMPTY | F_LOPRIORITYDBEMPTY)) - queue_work(cxgb3_wq, &adapter->db_empty_task); - - t3_write_reg(adapter, A_SG_INT_CAUSE, status); - if (status & SGE_FATALERR) - t3_fatal_err(adapter); -} - -/** - * sge_timer_tx - perform periodic maintenance of an SGE qset - * @data: the SGE queue set to maintain - * - * Runs periodically from a timer to perform maintenance of an SGE queue - * set. It performs two tasks: - * - * Cleans up any completed Tx descriptors that may still be pending. - * Normal descriptor cleanup happens when new packets are added to a Tx - * queue so this timer is relatively infrequent and does any cleanup only - * if the Tx queue has not seen any new packets in a while. We make a - * best effort attempt to reclaim descriptors, in that we don't wait - * around if we cannot get a queue's lock (which most likely is because - * someone else is queueing new packets and so will also handle the clean - * up). Since control queues use immediate data exclusively we don't - * bother cleaning them up here. - * - */ -static void sge_timer_tx(unsigned long data) -{ - struct sge_qset *qs = (struct sge_qset *)data; - struct port_info *pi = netdev_priv(qs->netdev); - struct adapter *adap = pi->adapter; - unsigned int tbd[SGE_TXQ_PER_SET] = {0, 0}; - unsigned long next_period; - - if (__netif_tx_trylock(qs->tx_q)) { - tbd[TXQ_ETH] = reclaim_completed_tx(adap, &qs->txq[TXQ_ETH], - TX_RECLAIM_TIMER_CHUNK); - __netif_tx_unlock(qs->tx_q); - } - - if (spin_trylock(&qs->txq[TXQ_OFLD].lock)) { - tbd[TXQ_OFLD] = reclaim_completed_tx(adap, &qs->txq[TXQ_OFLD], - TX_RECLAIM_TIMER_CHUNK); - spin_unlock(&qs->txq[TXQ_OFLD].lock); - } - - next_period = TX_RECLAIM_PERIOD >> - (max(tbd[TXQ_ETH], tbd[TXQ_OFLD]) / - TX_RECLAIM_TIMER_CHUNK); - mod_timer(&qs->tx_reclaim_timer, jiffies + next_period); -} - -/* - * sge_timer_rx - perform periodic maintenance of an SGE qset - * @data: the SGE queue set to maintain - * - * a) Replenishes Rx queues that have run out due to memory shortage. - * Normally new Rx buffers are added when existing ones are consumed but - * when out of memory a queue can become empty. We try to add only a few - * buffers here, the queue will be replenished fully as these new buffers - * are used up if memory shortage has subsided. - * - * b) Return coalesced response queue credits in case a response queue is - * starved. - * - */ -static void sge_timer_rx(unsigned long data) -{ - spinlock_t *lock; - struct sge_qset *qs = (struct sge_qset *)data; - struct port_info *pi = netdev_priv(qs->netdev); - struct adapter *adap = pi->adapter; - u32 status; - - lock = adap->params.rev > 0 ? - &qs->rspq.lock : &adap->sge.qs[0].rspq.lock; - - if (!spin_trylock_irq(lock)) - goto out; - - if (napi_is_scheduled(&qs->napi)) - goto unlock; - - if (adap->params.rev < 4) { - status = t3_read_reg(adap, A_SG_RSPQ_FL_STATUS); - - if (status & (1 << qs->rspq.cntxt_id)) { - qs->rspq.starved++; - if (qs->rspq.credits) { - qs->rspq.credits--; - refill_rspq(adap, &qs->rspq, 1); - qs->rspq.restarted++; - t3_write_reg(adap, A_SG_RSPQ_FL_STATUS, - 1 << qs->rspq.cntxt_id); - } - } - } - - if (qs->fl[0].credits < qs->fl[0].size) - __refill_fl(adap, &qs->fl[0]); - if (qs->fl[1].credits < qs->fl[1].size) - __refill_fl(adap, &qs->fl[1]); - -unlock: - spin_unlock_irq(lock); -out: - mod_timer(&qs->rx_reclaim_timer, jiffies + RX_RECLAIM_PERIOD); -} - -/** - * t3_update_qset_coalesce - update coalescing settings for a queue set - * @qs: the SGE queue set - * @p: new queue set parameters - * - * Update the coalescing settings for an SGE queue set. Nothing is done - * if the queue set is not initialized yet. - */ -void t3_update_qset_coalesce(struct sge_qset *qs, const struct qset_params *p) -{ - qs->rspq.holdoff_tmr = max(p->coalesce_usecs * 10, 1U);/* can't be 0 */ - qs->rspq.polling = p->polling; - qs->napi.poll = p->polling ? napi_rx_handler : ofld_poll; -} - -/** - * t3_sge_alloc_qset - initialize an SGE queue set - * @adapter: the adapter - * @id: the queue set id - * @nports: how many Ethernet ports will be using this queue set - * @irq_vec_idx: the IRQ vector index for response queue interrupts - * @p: configuration parameters for this queue set - * @ntxq: number of Tx queues for the queue set - * @netdev: net device associated with this queue set - * @netdevq: net device TX queue associated with this queue set - * - * Allocate resources and initialize an SGE queue set. A queue set - * comprises a response queue, two Rx free-buffer queues, and up to 3 - * Tx queues. The Tx queues are assigned roles in the order Ethernet - * queue, offload queue, and control queue. - */ -int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports, - int irq_vec_idx, const struct qset_params *p, - int ntxq, struct net_device *dev, - struct netdev_queue *netdevq) -{ - int i, avail, ret = -ENOMEM; - struct sge_qset *q = &adapter->sge.qs[id]; - - init_qset_cntxt(q, id); - setup_timer(&q->tx_reclaim_timer, sge_timer_tx, (unsigned long)q); - setup_timer(&q->rx_reclaim_timer, sge_timer_rx, (unsigned long)q); - - q->fl[0].desc = alloc_ring(adapter->pdev, p->fl_size, - sizeof(struct rx_desc), - sizeof(struct rx_sw_desc), - &q->fl[0].phys_addr, &q->fl[0].sdesc); - if (!q->fl[0].desc) - goto err; - - q->fl[1].desc = alloc_ring(adapter->pdev, p->jumbo_size, - sizeof(struct rx_desc), - sizeof(struct rx_sw_desc), - &q->fl[1].phys_addr, &q->fl[1].sdesc); - if (!q->fl[1].desc) - goto err; - - q->rspq.desc = alloc_ring(adapter->pdev, p->rspq_size, - sizeof(struct rsp_desc), 0, - &q->rspq.phys_addr, NULL); - if (!q->rspq.desc) - goto err; - - for (i = 0; i < ntxq; ++i) { - /* - * The control queue always uses immediate data so does not - * need to keep track of any sk_buffs. - */ - size_t sz = i == TXQ_CTRL ? 0 : sizeof(struct tx_sw_desc); - - q->txq[i].desc = alloc_ring(adapter->pdev, p->txq_size[i], - sizeof(struct tx_desc), sz, - &q->txq[i].phys_addr, - &q->txq[i].sdesc); - if (!q->txq[i].desc) - goto err; - - q->txq[i].gen = 1; - q->txq[i].size = p->txq_size[i]; - spin_lock_init(&q->txq[i].lock); - skb_queue_head_init(&q->txq[i].sendq); - } - - tasklet_init(&q->txq[TXQ_OFLD].qresume_tsk, restart_offloadq, - (unsigned long)q); - tasklet_init(&q->txq[TXQ_CTRL].qresume_tsk, restart_ctrlq, - (unsigned long)q); - - q->fl[0].gen = q->fl[1].gen = 1; - q->fl[0].size = p->fl_size; - q->fl[1].size = p->jumbo_size; - - q->rspq.gen = 1; - q->rspq.size = p->rspq_size; - spin_lock_init(&q->rspq.lock); - skb_queue_head_init(&q->rspq.rx_queue); - - q->txq[TXQ_ETH].stop_thres = nports * - flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3); - -#if FL0_PG_CHUNK_SIZE > 0 - q->fl[0].buf_size = FL0_PG_CHUNK_SIZE; -#else - q->fl[0].buf_size = SGE_RX_SM_BUF_SIZE + sizeof(struct cpl_rx_data); -#endif -#if FL1_PG_CHUNK_SIZE > 0 - q->fl[1].buf_size = FL1_PG_CHUNK_SIZE; -#else - q->fl[1].buf_size = is_offload(adapter) ? - (16 * 1024) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) : - MAX_FRAME_SIZE + 2 + sizeof(struct cpl_rx_pkt); -#endif - - q->fl[0].use_pages = FL0_PG_CHUNK_SIZE > 0; - q->fl[1].use_pages = FL1_PG_CHUNK_SIZE > 0; - q->fl[0].order = FL0_PG_ORDER; - q->fl[1].order = FL1_PG_ORDER; - q->fl[0].alloc_size = FL0_PG_ALLOC_SIZE; - q->fl[1].alloc_size = FL1_PG_ALLOC_SIZE; - - spin_lock_irq(&adapter->sge.reg_lock); - - /* FL threshold comparison uses < */ - ret = t3_sge_init_rspcntxt(adapter, q->rspq.cntxt_id, irq_vec_idx, - q->rspq.phys_addr, q->rspq.size, - q->fl[0].buf_size - SGE_PG_RSVD, 1, 0); - if (ret) - goto err_unlock; - - for (i = 0; i < SGE_RXQ_PER_SET; ++i) { - ret = t3_sge_init_flcntxt(adapter, q->fl[i].cntxt_id, 0, - q->fl[i].phys_addr, q->fl[i].size, - q->fl[i].buf_size - SGE_PG_RSVD, - p->cong_thres, 1, 0); - if (ret) - goto err_unlock; - } - - ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_ETH].cntxt_id, USE_GTS, - SGE_CNTXT_ETH, id, q->txq[TXQ_ETH].phys_addr, - q->txq[TXQ_ETH].size, q->txq[TXQ_ETH].token, - 1, 0); - if (ret) - goto err_unlock; - - if (ntxq > 1) { - ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_OFLD].cntxt_id, - USE_GTS, SGE_CNTXT_OFLD, id, - q->txq[TXQ_OFLD].phys_addr, - q->txq[TXQ_OFLD].size, 0, 1, 0); - if (ret) - goto err_unlock; - } - - if (ntxq > 2) { - ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_CTRL].cntxt_id, 0, - SGE_CNTXT_CTRL, id, - q->txq[TXQ_CTRL].phys_addr, - q->txq[TXQ_CTRL].size, - q->txq[TXQ_CTRL].token, 1, 0); - if (ret) - goto err_unlock; - } - - spin_unlock_irq(&adapter->sge.reg_lock); - - q->adap = adapter; - q->netdev = dev; - q->tx_q = netdevq; - t3_update_qset_coalesce(q, p); - - avail = refill_fl(adapter, &q->fl[0], q->fl[0].size, - GFP_KERNEL | __GFP_COMP); - if (!avail) { - CH_ALERT(adapter, "free list queue 0 initialization failed\n"); - goto err; - } - if (avail < q->fl[0].size) - CH_WARN(adapter, "free list queue 0 enabled with %d credits\n", - avail); - - avail = refill_fl(adapter, &q->fl[1], q->fl[1].size, - GFP_KERNEL | __GFP_COMP); - if (avail < q->fl[1].size) - CH_WARN(adapter, "free list queue 1 enabled with %d credits\n", - avail); - refill_rspq(adapter, &q->rspq, q->rspq.size - 1); - - t3_write_reg(adapter, A_SG_GTS, V_RSPQ(q->rspq.cntxt_id) | - V_NEWTIMER(q->rspq.holdoff_tmr)); - - return 0; - -err_unlock: - spin_unlock_irq(&adapter->sge.reg_lock); -err: - t3_free_qset(adapter, q); - return ret; -} - -/** - * t3_start_sge_timers - start SGE timer call backs - * @adap: the adapter - * - * Starts each SGE queue set's timer call back - */ -void t3_start_sge_timers(struct adapter *adap) -{ - int i; - - for (i = 0; i < SGE_QSETS; ++i) { - struct sge_qset *q = &adap->sge.qs[i]; - - if (q->tx_reclaim_timer.function) - mod_timer(&q->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); - - if (q->rx_reclaim_timer.function) - mod_timer(&q->rx_reclaim_timer, jiffies + RX_RECLAIM_PERIOD); - } -} - -/** - * t3_stop_sge_timers - stop SGE timer call backs - * @adap: the adapter - * - * Stops each SGE queue set's timer call back - */ -void t3_stop_sge_timers(struct adapter *adap) -{ - int i; - - for (i = 0; i < SGE_QSETS; ++i) { - struct sge_qset *q = &adap->sge.qs[i]; - - if (q->tx_reclaim_timer.function) - del_timer_sync(&q->tx_reclaim_timer); - if (q->rx_reclaim_timer.function) - del_timer_sync(&q->rx_reclaim_timer); - } -} - -/** - * t3_free_sge_resources - free SGE resources - * @adap: the adapter - * - * Frees resources used by the SGE queue sets. - */ -void t3_free_sge_resources(struct adapter *adap) -{ - int i; - - for (i = 0; i < SGE_QSETS; ++i) - t3_free_qset(adap, &adap->sge.qs[i]); -} - -/** - * t3_sge_start - enable SGE - * @adap: the adapter - * - * Enables the SGE for DMAs. This is the last step in starting packet - * transfers. - */ -void t3_sge_start(struct adapter *adap) -{ - t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, F_GLOBALENABLE); -} - -/** - * t3_sge_stop - disable SGE operation - * @adap: the adapter - * - * Disables the DMA engine. This can be called in emeregencies (e.g., - * from error interrupts) or from normal process context. In the latter - * case it also disables any pending queue restart tasklets. Note that - * if it is called in interrupt context it cannot disable the restart - * tasklets as it cannot wait, however the tasklets will have no effect - * since the doorbells are disabled and the driver will call this again - * later from process context, at which time the tasklets will be stopped - * if they are still running. - */ -void t3_sge_stop(struct adapter *adap) -{ - t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, 0); - if (!in_interrupt()) { - int i; - - for (i = 0; i < SGE_QSETS; ++i) { - struct sge_qset *qs = &adap->sge.qs[i]; - - tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk); - tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk); - } - } -} - -/** - * t3_sge_init - initialize SGE - * @adap: the adapter - * @p: the SGE parameters - * - * Performs SGE initialization needed every time after a chip reset. - * We do not initialize any of the queue sets here, instead the driver - * top-level must request those individually. We also do not enable DMA - * here, that should be done after the queues have been set up. - */ -void t3_sge_init(struct adapter *adap, struct sge_params *p) -{ - unsigned int ctrl, ups = ffs(pci_resource_len(adap->pdev, 2) >> 12); - - ctrl = F_DROPPKT | V_PKTSHIFT(2) | F_FLMODE | F_AVOIDCQOVFL | - F_CQCRDTCTRL | F_CONGMODE | F_TNLFLMODE | F_FATLPERREN | - V_HOSTPAGESIZE(PAGE_SHIFT - 11) | F_BIGENDIANINGRESS | - V_USERSPACESIZE(ups ? ups - 1 : 0) | F_ISCSICOALESCING; -#if SGE_NUM_GENBITS == 1 - ctrl |= F_EGRGENCTRL; -#endif - if (adap->params.rev > 0) { - if (!(adap->flags & (USING_MSIX | USING_MSI))) - ctrl |= F_ONEINTMULTQ | F_OPTONEINTMULTQ; - } - t3_write_reg(adap, A_SG_CONTROL, ctrl); - t3_write_reg(adap, A_SG_EGR_RCQ_DRB_THRSH, V_HIRCQDRBTHRSH(512) | - V_LORCQDRBTHRSH(512)); - t3_write_reg(adap, A_SG_TIMER_TICK, core_ticks_per_usec(adap) / 10); - t3_write_reg(adap, A_SG_CMDQ_CREDIT_TH, V_THRESHOLD(32) | - V_TIMEOUT(200 * core_ticks_per_usec(adap))); - t3_write_reg(adap, A_SG_HI_DRB_HI_THRSH, - adap->params.rev < T3_REV_C ? 1000 : 500); - t3_write_reg(adap, A_SG_HI_DRB_LO_THRSH, 256); - t3_write_reg(adap, A_SG_LO_DRB_HI_THRSH, 1000); - t3_write_reg(adap, A_SG_LO_DRB_LO_THRSH, 256); - t3_write_reg(adap, A_SG_OCO_BASE, V_BASE1(0xfff)); - t3_write_reg(adap, A_SG_DRB_PRI_THRESH, 63 * 1024); -} - -/** - * t3_sge_prep - one-time SGE initialization - * @adap: the associated adapter - * @p: SGE parameters - * - * Performs one-time initialization of SGE SW state. Includes determining - * defaults for the assorted SGE parameters, which admins can change until - * they are used to initialize the SGE. - */ -void t3_sge_prep(struct adapter *adap, struct sge_params *p) -{ - int i; - - p->max_pkt_size = (16 * 1024) - sizeof(struct cpl_rx_data) - - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); - - for (i = 0; i < SGE_QSETS; ++i) { - struct qset_params *q = p->qset + i; - - q->polling = adap->params.rev > 0; - q->coalesce_usecs = 5; - q->rspq_size = 1024; - q->fl_size = 1024; - q->jumbo_size = 512; - q->txq_size[TXQ_ETH] = 1024; - q->txq_size[TXQ_OFLD] = 1024; - q->txq_size[TXQ_CTRL] = 256; - q->cong_thres = 0; - } - - spin_lock_init(&adap->sge.reg_lock); -} |