chelsio: Move the Chelsio drivers

Moves the drivers for the Chelsio chipsets into
drivers/net/ethernet/chelsio/ and the necessary Kconfig and Makefile
changes.

CC: Divy Le Ray <divy@chelsio.com>
CC: Dimitris Michailidis <dm@chelsio.com>
CC: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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 d6fa1777a343..000000000000
--- 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-&g