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cxgb3 - sge page management

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Streamline sge page management.
Fix dma mappings when buffers are recycled.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Divy Le Ray 2007-05-30 21:10:47 -07:00 committed by Jeff Garzik
parent 287aa83dff
commit cf992af561
2 changed files with 232 additions and 229 deletions
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38
drivers/net/cxgb3/adapter.h
View File

@ -71,27 +71,29 @@ enum { /* adapter flags */
QUEUES_BOUND = (1 << 3),
};
struct fl_pg_chunk {
struct page *page;
void *va;
unsigned int offset;
};
struct rx_desc;
struct rx_sw_desc;
struct sge_fl_page {
struct skb_frag_struct frag;
unsigned char *va;
};
struct sge_fl { /* SGE per free-buffer list state */
unsigned int buf_size; /* size of each Rx buffer */
unsigned int credits; /* # of available Rx buffers */
unsigned int size; /* capacity of free list */
unsigned int cidx; /* consumer index */
unsigned int pidx; /* producer index */
unsigned int gen; /* free list generation */
unsigned int cntxt_id; /* SGE context id for the free list */
struct sge_fl_page page;
struct rx_desc *desc; /* address of HW Rx descriptor ring */
struct rx_sw_desc *sdesc; /* address of SW Rx descriptor ring */
dma_addr_t phys_addr; /* physical address of HW ring start */
unsigned long empty; /* # of times queue ran out of buffers */
struct sge_fl { /* SGE per free-buffer list state */
unsigned int buf_size; /* size of each Rx buffer */
unsigned int credits; /* # of available Rx buffers */
unsigned int size; /* capacity of free list */
unsigned int cidx; /* consumer index */
unsigned int pidx; /* producer index */
unsigned int gen; /* free list generation */
struct fl_pg_chunk pg_chunk;/* page chunk cache */
unsigned int use_pages; /* whether FL uses pages or sk_buffs */
struct rx_desc *desc; /* address of HW Rx descriptor ring */
struct rx_sw_desc *sdesc; /* address of SW Rx descriptor ring */
dma_addr_t phys_addr; /* physical address of HW ring start */
unsigned int cntxt_id; /* SGE context id for the free list */
unsigned long empty; /* # of times queue ran out of buffers */
unsigned long alloc_failed; /* # of times buffer allocation failed */
};

423
drivers/net/cxgb3/sge.c
View File

@ -46,23 +46,16 @@
#define SGE_RX_SM_BUF_SIZE 1536
/*
* If USE_RX_PAGE is defined, the small freelist populated with (partial)
* pages instead of skbs. Pages are carved up into RX_PAGE_SIZE chunks (must
* be a multiple of the host page size).
*/
#define USE_RX_PAGE
#define RX_PAGE_SIZE 2048
/*
* skb freelist packets are copied into a new skb (and the freelist one is
* reused) if their len is <=
*/
#define SGE_RX_COPY_THRES 256
#define SGE_RX_PULL_LEN 128
/*
* Minimum number of freelist entries before we start dropping TUNNEL frames.
* 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 SGE_RX_DROP_THRES 16
/*
@ -100,12 +93,12 @@ struct tx_sw_desc { /* SW state per Tx descriptor */
struct sk_buff *skb;
};
struct rx_sw_desc { /* SW state per Rx descriptor */
struct rx_sw_desc { /* SW state per Rx descriptor */
union {
struct sk_buff *skb;
struct sge_fl_page page;
} t;
DECLARE_PCI_UNMAP_ADDR(dma_addr);
struct fl_pg_chunk pg_chunk;
};
DECLARE_PCI_UNMAP_ADDR(dma_addr);
};
struct rsp_desc { /* response queue descriptor */
@ -351,27 +344,26 @@ static void free_rx_bufs(struct pci_dev *pdev, struct sge_fl *q)
pci_unmap_single(pdev, pci_unmap_addr(d, dma_addr),
q->buf_size, PCI_DMA_FROMDEVICE);
if (q->buf_size != RX_PAGE_SIZE) {
kfree_skb(d->t.skb);
d->t.skb = NULL;
if (q->use_pages) {
put_page(d->pg_chunk.page);
d->pg_chunk.page = NULL;
} else {
if (d->t.page.frag.page)
put_page(d->t.page.frag.page);
d->t.page.frag.page = NULL;
kfree_skb(d->skb);
d->skb = NULL;
}
if (++cidx == q->size)
cidx = 0;
}
if (q->page.frag.page)
put_page(q->page.frag.page);
q->page.frag.page = NULL;
if (q->pg_chunk.page) {
__free_page(q->pg_chunk.page);
q->pg_chunk.page = NULL;
}
}
/**
* add_one_rx_buf - add a packet buffer to a free-buffer list
* @va: va of the buffer to add
* @va: buffer start VA
* @len: the buffer length
* @d: the HW Rx descriptor to write
* @sd: the SW Rx descriptor to write
@ -381,7 +373,7 @@ static void free_rx_bufs(struct pci_dev *pdev, struct sge_fl *q)
* Add a buffer of the given length to the supplied HW and SW Rx
* descriptors.
*/
static inline void add_one_rx_buf(unsigned char *va, unsigned int len,
static inline void 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)
{
@ -397,6 +389,27 @@ static inline void add_one_rx_buf(unsigned char *va, unsigned int len,
d->gen2 = cpu_to_be32(V_FLD_GEN2(gen));
}
static int alloc_pg_chunk(struct sge_fl *q, struct rx_sw_desc *sd, gfp_t gfp)
{
if (!q->pg_chunk.page) {
q->pg_chunk.page = alloc_page(gfp);
if (unlikely(!q->pg_chunk.page))
return -ENOMEM;
q->pg_chunk.va = page_address(q->pg_chunk.page);
q->pg_chunk.offset = 0;
}
sd->pg_chunk = q->pg_chunk;
q->pg_chunk.offset += q->buf_size;
if (q->pg_chunk.offset == PAGE_SIZE)
q->pg_chunk.page = NULL;
else {
q->pg_chunk.va += q->buf_size;
get_page(q->pg_chunk.page);
}
return 0;
}
/**
* refill_fl - refill an SGE free-buffer list
* @adapter: the adapter
@ -410,49 +423,29 @@ static inline void add_one_rx_buf(unsigned char *va, unsigned int len,
*/
static void refill_fl(struct adapter *adap, struct sge_fl *q, int n, gfp_t gfp)
{
void *buf_start;
struct rx_sw_desc *sd = &q->sdesc[q->pidx];
struct rx_desc *d = &q->desc[q->pidx];
struct sge_fl_page *p = &q->page;
while (n--) {
unsigned char *va;
if (unlikely(q->buf_size != RX_PAGE_SIZE)) {
struct sk_buff *skb = alloc_skb(q->buf_size, gfp);
if (!skb) {
q->alloc_failed++;
if (q->use_pages) {
if (unlikely(alloc_pg_chunk(q, sd, gfp))) {
nomem: q->alloc_failed++;
break;
}
va = skb->data;
sd->t.skb = skb;
buf_start = sd->pg_chunk.va;
} else {
if (!p->frag.page) {
p->frag.page = alloc_pages(gfp, 0);
if (unlikely(!p->frag.page)) {
q->alloc_failed++;
break;
} else {
p->frag.size = RX_PAGE_SIZE;
p->frag.page_offset = 0;
p->va = page_address(p->frag.page);
}
}
struct sk_buff *skb = alloc_skb(q->buf_size, gfp);
memcpy(&sd->t, p, sizeof(*p));
va = p->va;
if (!skb)
goto nomem;
p->frag.page_offset += RX_PAGE_SIZE;
BUG_ON(p->frag.page_offset > PAGE_SIZE);
p->va += RX_PAGE_SIZE;
if (p->frag.page_offset == PAGE_SIZE)
p->frag.page = NULL;
else
get_page(p->frag.page);
sd->skb = skb;
buf_start = skb->data;
}
add_one_rx_buf(va, q->buf_size, d, sd, q->gen, adap->pdev);
add_one_rx_buf(buf_start, q->buf_size, d, sd, q->gen,
adap->pdev);
d++;
sd++;
if (++q->pidx == q->size) {
@ -487,7 +480,7 @@ static void recycle_rx_buf(struct adapter *adap, struct sge_fl *q,
struct rx_desc *from = &q->desc[idx];
struct rx_desc *to = &q->desc[q->pidx];
memcpy(&q->sdesc[q->pidx], &q->sdesc[idx], sizeof(struct rx_sw_desc));
q->sdesc[q->pidx] = q->sdesc[idx];
to->addr_lo = from->addr_lo; /* already big endian */
to->addr_hi = from->addr_hi; /* likewise */
wmb();
@ -649,6 +642,132 @@ static inline unsigned int flits_to_desc(unsigned int n)
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,
pci_unmap_addr(sd, dma_addr), len,
PCI_DMA_FROMDEVICE);
memcpy(skb->data, sd->skb->data, len);
pci_dma_sync_single_for_device(adap->pdev,
pci_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))
goto recycle;
use_orig_buf:
pci_unmap_single(adap->pdev, pci_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,
unsigned int len, unsigned int drop_thres)
{
struct sk_buff *skb = NULL;
struct rx_sw_desc *sd = &fl->sdesc[fl->cidx];
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,
pci_unmap_addr(sd, dma_addr), len,
PCI_DMA_FROMDEVICE);
memcpy(skb->data, sd->pg_chunk.va, len);
pci_dma_sync_single_for_device(adap->pdev,
pci_unmap_addr(sd, dma_addr), len,
PCI_DMA_FROMDEVICE);
} else if (!drop_thres)
return NULL;
recycle:
fl->credits--;
recycle_rx_buf(adap, fl, fl->cidx);
return skb;
}
if (unlikely(fl->credits <= drop_thres))
goto recycle;
skb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC);
if (unlikely(!skb)) {
if (!drop_thres)
return NULL;
goto recycle;
}
pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr),
fl->buf_size, PCI_DMA_FROMDEVICE);
__skb_put(skb, SGE_RX_PULL_LEN);
memcpy(skb->data, sd->pg_chunk.va, SGE_RX_PULL_LEN);
skb_fill_page_desc(skb, 0, sd->pg_chunk.page,
sd->pg_chunk.offset + SGE_RX_PULL_LEN,
len - SGE_RX_PULL_LEN);
skb->len = len;
skb->data_len = len - SGE_RX_PULL_LEN;
skb->truesize += skb->data_len;
fl->credits--;
/*
* We do not refill FLs here, we let the caller do it to overlap a
* prefetch.
*/
return skb;
}
/**
* get_imm_packet - return the next ingress packet buffer from a response
* @resp: the response descriptor containing the packet data
@ -1715,85 +1834,6 @@ static void rx_eth(struct adapter *adap, struct sge_rspq *rq,
netif_rx(skb);
}
#define SKB_DATA_SIZE 128
static void skb_data_init(struct sk_buff *skb, struct sge_fl_page *p,
unsigned int len)
{
skb->len = len;
if (len <= SKB_DATA_SIZE) {
skb_copy_to_linear_data(skb, p->va, len);
skb->tail += len;
put_page(p->frag.page);
} else {
skb_copy_to_linear_data(skb, p->va, SKB_DATA_SIZE);
skb_shinfo(skb)->frags[0].page = p->frag.page;
skb_shinfo(skb)->frags[0].page_offset =
p->frag.page_offset + SKB_DATA_SIZE;
skb_shinfo(skb)->frags[0].size = len - SKB_DATA_SIZE;
skb_shinfo(skb)->nr_frags = 1;
skb->data_len = len - SKB_DATA_SIZE;
skb->tail += SKB_DATA_SIZE;
skb->truesize += skb->data_len;
}
}
/**
* 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->t.skb->data);
if (len <= SGE_RX_COPY_THRES) {
skb = alloc_skb(len, GFP_ATOMIC);
if (likely(skb != NULL)) {
struct rx_desc *d = &fl->desc[fl->cidx];
dma_addr_t mapping =
(dma_addr_t)((u64) be32_to_cpu(d->addr_hi) << 32 |
be32_to_cpu(d->addr_lo));
__skb_put(skb, len);
pci_dma_sync_single_for_cpu(adap->pdev, mapping, len,
PCI_DMA_FROMDEVICE);
skb_copy_from_linear_data(sd->t.skb, skb->data, len);
pci_dma_sync_single_for_device(adap->pdev, mapping, 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))
goto recycle;
use_orig_buf:
pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr),
fl->buf_size, PCI_DMA_FROMDEVICE);
skb = sd->t.skb;
skb_put(skb, len);
__refill_fl(adap, fl);
return skb;
}
/**
* handle_rsp_cntrl_info - handles control information in a response
* @qs: the queue set corresponding to the response
@ -1935,7 +1975,7 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs,
} else if (flags & F_RSPD_IMM_DATA_VALID) {
skb = get_imm_packet(r);
if (unlikely(!skb)) {
no_mem:
no_mem:
q->next_holdoff = NOMEM_INTR_DELAY;
q->nomem++;
/* consume one credit since we tried */
@ -1945,53 +1985,29 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs,
q->imm_data++;
ethpad = 0;
} else if ((len = ntohl(r->len_cq)) != 0) {
struct sge_fl *fl =
(len & F_RSPD_FLQ) ? &qs->fl[1] : &qs->fl[0];
struct sge_fl *fl;
if (fl->buf_size == RX_PAGE_SIZE) {
struct rx_sw_desc *sd = &fl->sdesc[fl->cidx];
struct sge_fl_page *p = &sd->t.page;
prefetch(p->va);
prefetch(p->va + L1_CACHE_BYTES);
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);
pci_unmap_single(adap->pdev,
pci_unmap_addr(sd, dma_addr),
fl->buf_size,
PCI_DMA_FROMDEVICE);
if (eth) {
if (unlikely(fl->credits <
SGE_RX_DROP_THRES))
goto eth_recycle;
skb = alloc_skb(SKB_DATA_SIZE,
GFP_ATOMIC);
if (unlikely(!skb)) {
eth_recycle:
q->rx_drops++;
recycle_rx_buf(adap, fl,
fl->cidx);
goto eth_done;
}
} else {
skb = alloc_skb(SKB_DATA_SIZE,
GFP_ATOMIC);
if (unlikely(!skb))
goto no_mem;
}
skb_data_init(skb, p, G_RSPD_LEN(len));
eth_done:
fl->credits--;
q->eth_pkts++;
} else {
fl->credits--;
skb = get_packet_pg(adap, fl, G_RSPD_LEN(len),
eth ? SGE_RX_DROP_THRES : 0);
} 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);
if (++fl->cidx == fl->size)
fl->cidx = 0;
@ -2016,20 +2032,15 @@ eth_done:
q->credits = 0;
}
if (skb) {
/* Preserve the RSS info in csum & priority */
skb->csum = rss_hi;
skb->priority = rss_lo;
if (likely(skb != NULL)) {
if (eth)
rx_eth(adap, q, skb, ethpad);
else {
if (unlikely(r->rss_hdr.opcode ==
CPL_TRACE_PKT))
__skb_pull(skb, ethpad);
ngathered = rx_offload(&adap->tdev, q,
skb, offload_skbs,
/* 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);
}
}
@ -2635,25 +2646,15 @@ int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports,
q->txq[TXQ_ETH].stop_thres = nports *
flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3);
if (!is_offload(adapter)) {
#ifdef USE_RX_PAGE
q->fl[0].buf_size = RX_PAGE_SIZE;
#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 + 2 +
sizeof(struct cpl_rx_pkt);
q->fl[0].buf_size = SGE_RX_SM_BUF_SIZE + sizeof(struct cpl_rx_data);
#endif
q->fl[1].buf_size = MAX_FRAME_SIZE + 2 +
sizeof(struct cpl_rx_pkt);
} else {
#ifdef USE_RX_PAGE
q->fl[0].buf_size = RX_PAGE_SIZE;
#else
q->fl[0].buf_size = SGE_RX_SM_BUF_SIZE +
sizeof(struct cpl_rx_data);
#endif
q->fl[1].buf_size = (16 * 1024) -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
q->fl[0].use_pages = FL0_PG_CHUNK_SIZE > 0;
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);
spin_lock(&adapter->sge.reg_lock);