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cxgb4: convert to SKB paged frag API.

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Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Dimitris Michailidis <dm@chelsio.com>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ian Campbell 2011-10-19 23:01:46 +00:00 committed by David S. Miller
parent 311761c8a5
commit e91b0f2491
2 changed files with 24 additions and 23 deletions
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2
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
View File

@ -326,7 +326,7 @@ struct sge_fl { /* SGE free-buffer queue state */
/* A packet gather list */
struct pkt_gl {
skb_frag_t frags[MAX_SKB_FRAGS];
struct page_frag frags[MAX_SKB_FRAGS];
void *va; /* virtual address of first byte */
unsigned int nfrags; /* # of fragments */
unsigned int tot_len; /* total length of fragments */

45
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -215,8 +215,8 @@ static int map_skb(struct device *dev, const struct sk_buff *skb,
end = &si->frags[si->nr_frags];
for (fp = si->frags; fp < end; fp++) {
*++addr = dma_map_page(dev, fp->page, fp->page_offset,
skb_frag_size(fp), DMA_TO_DEVICE);
*++addr = skb_frag_dma_map(dev, fp, 0, skb_frag_size(fp),
DMA_TO_DEVICE);
if (dma_mapping_error(dev, *addr))
goto unwind;
}
@ -1409,22 +1409,23 @@ int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb)
}
EXPORT_SYMBOL(cxgb4_ofld_send);
static inline void copy_frags(struct skb_shared_info *ssi,
static inline void copy_frags(struct sk_buff *skb,
const struct pkt_gl *gl, unsigned int offset)
{
unsigned int n;
int i;
/* usually there's just one frag */
ssi->frags[0].page = gl->frags[0].page;
ssi->frags[0].page_offset = gl->frags[0].page_offset + offset;
skb_frag_size_set(&ssi->frags[0], skb_frag_size(&gl->frags[0]) - offset);
ssi->nr_frags = gl->nfrags;
n = gl->nfrags - 1;
if (n)
memcpy(&ssi->frags[1], &gl->frags[1], n * sizeof(skb_frag_t));
__skb_fill_page_desc(skb, 0, gl->frags[0].page,
gl->frags[0].offset + offset,
gl->frags[0].size - offset);
skb_shinfo(skb)->nr_frags = gl->nfrags;
for (i = 1; i < gl->nfrags; i++)
__skb_fill_page_desc(skb, i, gl->frags[i].page,
gl->frags[i].offset,
gl->frags[i].size);
/* get a reference to the last page, we don't own it */
get_page(gl->frags[n].page);
get_page(gl->frags[gl->nfrags - 1].page);
}
/**
@ -1459,7 +1460,7 @@ struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
__skb_put(skb, pull_len);
skb_copy_to_linear_data(skb, gl->va, pull_len);
copy_frags(skb_shinfo(skb), gl, pull_len);
copy_frags(skb, gl, pull_len);
skb->len = gl->tot_len;
skb->data_len = skb->len - pull_len;
skb->truesize += skb->data_len;
@ -1478,7 +1479,7 @@ EXPORT_SYMBOL(cxgb4_pktgl_to_skb);
static void t4_pktgl_free(const struct pkt_gl *gl)
{
int n;
const skb_frag_t *p;
const struct page_frag *p;
for (p = gl->frags, n = gl->nfrags - 1; n--; p++)
put_page(p->page);
@ -1522,7 +1523,7 @@ static void do_gro(struct sge_eth_rxq *rxq, const struct pkt_gl *gl,
return;
}
copy_frags(skb_shinfo(skb), gl, RX_PKT_PAD);
copy_frags(skb, gl, RX_PKT_PAD);
skb->len = gl->tot_len - RX_PKT_PAD;
skb->data_len = skb->len;
skb->truesize += skb->data_len;
@ -1698,7 +1699,7 @@ static int process_responses(struct sge_rspq *q, int budget)
rmb();
rsp_type = RSPD_TYPE(rc->type_gen);
if (likely(rsp_type == RSP_TYPE_FLBUF)) {
skb_frag_t *fp;
struct page_frag *fp;
struct pkt_gl si;
const struct rx_sw_desc *rsd;
u32 len = ntohl(rc->pldbuflen_qid), bufsz, frags;
@ -1717,9 +1718,9 @@ static int process_responses(struct sge_rspq *q, int budget)
rsd = &rxq->fl.sdesc[rxq->fl.cidx];
bufsz = get_buf_size(rsd);
fp->page = rsd->page;
fp->page_offset = q->offset;
skb_frag_size_set(fp, min(bufsz, len));
len -= skb_frag_size(fp);
fp->offset = q->offset;
fp->size = min(bufsz, len);
len -= fp->size;
if (!len)
break;
unmap_rx_buf(q->adap, &rxq->fl);
@ -1731,16 +1732,16 @@ static int process_responses(struct sge_rspq *q, int budget)
*/
dma_sync_single_for_cpu(q->adap->pdev_dev,
get_buf_addr(rsd),
skb_frag_size(fp), DMA_FROM_DEVICE);
fp->size, DMA_FROM_DEVICE);
si.va = page_address(si.frags[0].page) +
si.frags[0].page_offset;
si.frags[0].offset;
prefetch(si.va);
si.nfrags = frags + 1;
ret = q->handler(q, q->cur_desc, &si);
if (likely(ret == 0))
q->offset += ALIGN(skb_frag_size(fp), FL_ALIGN);
q->offset += ALIGN(fp->size, FL_ALIGN);
else
restore_rx_bufs(&si, &rxq->fl, frags);
} else if (likely(rsp_type == RSP_TYPE_CPL)) {