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[BNX2]: Add fast path code to handle RX pages. 

Add function to reuse a page in case of allocation or other errors.
Add code to construct the completed SKB with the additional data in
the pages.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2007-12-12 11:19:35 -08:00 committed by David S. Miller
parent 47bf4246a3
commit 1db82f2aec
2 changed files with 140 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

144
drivers/net/bnx2.c
View File

@ -2411,6 +2411,55 @@ bnx2_tx_int(struct bnx2 *bp)
}
}
static void
bnx2_reuse_rx_skb_pages(struct bnx2 *bp, struct sk_buff *skb, int count)
{
struct sw_pg *cons_rx_pg, *prod_rx_pg;
struct rx_bd *cons_bd, *prod_bd;
dma_addr_t mapping;
int i;
u16 hw_prod = bp->rx_pg_prod, prod;
u16 cons = bp->rx_pg_cons;
for (i = 0; i < count; i++) {
prod = RX_PG_RING_IDX(hw_prod);
prod_rx_pg = &bp->rx_pg_ring[prod];
cons_rx_pg = &bp->rx_pg_ring[cons];
cons_bd = &bp->rx_pg_desc_ring[RX_RING(cons)][RX_IDX(cons)];
prod_bd = &bp->rx_pg_desc_ring[RX_RING(prod)][RX_IDX(prod)];
if (i == 0 && skb) {
struct page *page;
struct skb_shared_info *shinfo;
shinfo = skb_shinfo(skb);
shinfo->nr_frags--;
page = shinfo->frags[shinfo->nr_frags].page;
shinfo->frags[shinfo->nr_frags].page = NULL;
mapping = pci_map_page(bp->pdev, page, 0, PAGE_SIZE,
PCI_DMA_FROMDEVICE);
cons_rx_pg->page = page;
pci_unmap_addr_set(cons_rx_pg, mapping, mapping);
dev_kfree_skb(skb);
}
if (prod != cons) {
prod_rx_pg->page = cons_rx_pg->page;
cons_rx_pg->page = NULL;
pci_unmap_addr_set(prod_rx_pg, mapping,
pci_unmap_addr(cons_rx_pg, mapping));
prod_bd->rx_bd_haddr_hi = cons_bd->rx_bd_haddr_hi;
prod_bd->rx_bd_haddr_lo = cons_bd->rx_bd_haddr_lo;
}
cons = RX_PG_RING_IDX(NEXT_RX_BD(cons));
hw_prod = NEXT_RX_BD(hw_prod);
}
bp->rx_pg_prod = hw_prod;
bp->rx_pg_cons = cons;
}
static inline void
bnx2_reuse_rx_skb(struct bnx2 *bp, struct sk_buff *skb,
u16 cons, u16 prod)
@ -2443,7 +2492,7 @@ bnx2_reuse_rx_skb(struct bnx2 *bp, struct sk_buff *skb,
static int
bnx2_rx_skb(struct bnx2 *bp, struct sk_buff *skb, unsigned int len,
dma_addr_t dma_addr, u32 ring_idx)
unsigned int hdr_len, dma_addr_t dma_addr, u32 ring_idx)
{
int err;
u16 prod = ring_idx & 0xffff;
@ -2451,6 +2500,12 @@ bnx2_rx_skb(struct bnx2 *bp, struct sk_buff *skb, unsigned int len,
err = bnx2_alloc_rx_skb(bp, prod);
if (unlikely(err)) {
bnx2_reuse_rx_skb(bp, skb, (u16) (ring_idx >> 16), prod);
if (hdr_len) {
unsigned int raw_len = len + 4;
int pages = PAGE_ALIGN(raw_len - hdr_len) >> PAGE_SHIFT;
bnx2_reuse_rx_skb_pages(bp, NULL, pages);
}
return err;
}
@ -2458,7 +2513,69 @@ bnx2_rx_skb(struct bnx2 *bp, struct sk_buff *skb, unsigned int len,
pci_unmap_single(bp->pdev, dma_addr, bp->rx_buf_use_size,
PCI_DMA_FROMDEVICE);
skb_put(skb, len);
if (hdr_len == 0) {
skb_put(skb, len);
return 0;
} else {
unsigned int i, frag_len, frag_size, pages;
struct sw_pg *rx_pg;
u16 pg_cons = bp->rx_pg_cons;
u16 pg_prod = bp->rx_pg_prod;
frag_size = len + 4 - hdr_len;
pages = PAGE_ALIGN(frag_size) >> PAGE_SHIFT;
skb_put(skb, hdr_len);
for (i = 0; i < pages; i++) {
frag_len = min(frag_size, (unsigned int) PAGE_SIZE);
if (unlikely(frag_len <= 4)) {
unsigned int tail = 4 - frag_len;
bp->rx_pg_cons = pg_cons;
bp->rx_pg_prod = pg_prod;
bnx2_reuse_rx_skb_pages(bp, NULL, pages - i);
skb->len -= tail;
if (i == 0) {
skb->tail -= tail;
} else {
skb_frag_t *frag =
&skb_shinfo(skb)->frags[i - 1];
frag->size -= tail;
skb->data_len -= tail;
skb->truesize -= tail;
}
return 0;
}
rx_pg = &bp->rx_pg_ring[pg_cons];
pci_unmap_page(bp->pdev, pci_unmap_addr(rx_pg, mapping),
PAGE_SIZE, PCI_DMA_FROMDEVICE);
if (i == pages - 1)
frag_len -= 4;
skb_fill_page_desc(skb, i, rx_pg->page, 0, frag_len);
rx_pg->page = NULL;
err = bnx2_alloc_rx_page(bp, RX_PG_RING_IDX(pg_prod));
if (unlikely(err)) {
bp->rx_pg_cons = pg_cons;
bp->rx_pg_prod = pg_prod;
bnx2_reuse_rx_skb_pages(bp, skb, pages - i);
return err;
}
frag_size -= frag_len;
skb->data_len += frag_len;
skb->truesize += frag_len;
skb->len += frag_len;
pg_prod = NEXT_RX_BD(pg_prod);
pg_cons = RX_PG_RING_IDX(NEXT_RX_BD(pg_cons));
}
bp->rx_pg_prod = pg_prod;
bp->rx_pg_cons = pg_cons;
}
return 0;
}
@ -2477,7 +2594,7 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
{
u16 hw_cons, sw_cons, sw_ring_cons, sw_prod, sw_ring_prod;
struct l2_fhdr *rx_hdr;
int rx_pkt = 0;
int rx_pkt = 0, pg_ring_used = 0;
hw_cons = bnx2_get_hw_rx_cons(bp);
sw_cons = bp->rx_cons;
@ -2488,7 +2605,7 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
*/
rmb();
while (sw_cons != hw_cons) {
unsigned int len;
unsigned int len, hdr_len;
u32 status;
struct sw_bd *rx_buf;
struct sk_buff *skb;
@ -2508,7 +2625,7 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
bp->rx_offset + RX_COPY_THRESH, PCI_DMA_FROMDEVICE);
rx_hdr = (struct l2_fhdr *) skb->data;
len = rx_hdr->l2_fhdr_pkt_len - 4;
len = rx_hdr->l2_fhdr_pkt_len;
if ((status = rx_hdr->l2_fhdr_status) &
(L2_FHDR_ERRORS_BAD_CRC |
@ -2520,6 +2637,16 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
bnx2_reuse_rx_skb(bp, skb, sw_ring_cons, sw_ring_prod);
goto next_rx;
}
hdr_len = 0;
if (status & L2_FHDR_STATUS_SPLIT) {
hdr_len = rx_hdr->l2_fhdr_ip_xsum;
pg_ring_used = 1;
} else if (len > bp->rx_jumbo_thresh) {
hdr_len = bp->rx_jumbo_thresh;
pg_ring_used = 1;
}
len -= 4;
if (len <= bp->rx_copy_thresh) {
struct sk_buff *new_skb;
@ -2541,7 +2668,7 @@ bnx2_rx_int(struct bnx2 *bp, int budget)
sw_ring_cons, sw_ring_prod);
skb = new_skb;
} else if (unlikely(bnx2_rx_skb(bp, skb, len, dma_addr,
} else if (unlikely(bnx2_rx_skb(bp, skb, len, hdr_len, dma_addr,
(sw_ring_cons << 16) | sw_ring_prod)))
goto next_rx;
@ -2593,6 +2720,10 @@ next_rx:
bp->rx_cons = sw_cons;
bp->rx_prod = sw_prod;
if (pg_ring_used)
REG_WR16(bp, MB_RX_CID_ADDR + BNX2_L2CTX_HOST_PG_BDIDX,
bp->rx_pg_prod);
REG_WR16(bp, MB_RX_CID_ADDR + BNX2_L2CTX_HOST_BDIDX, sw_prod);
REG_WR(bp, MB_RX_CID_ADDR + BNX2_L2CTX_HOST_BSEQ, bp->rx_prod_bseq);
@ -4375,6 +4506,7 @@ bnx2_set_rx_ring_size(struct bnx2 *bp, u32 size)
bp->rx_buf_use_size = rx_size;
/* hw alignment */
bp->rx_buf_size = bp->rx_buf_use_size + BNX2_RX_ALIGN;
bp->rx_jumbo_thresh = rx_size - bp->rx_offset;
bp->rx_ring_size = size;
bp->rx_max_ring = bnx2_find_max_ring(size, MAX_RX_RINGS);
bp->rx_max_ring_idx = (bp->rx_max_ring * RX_DESC_CNT) - 1;

2
drivers/net/bnx2.h
View File

@ -259,6 +259,7 @@ struct l2_fhdr {
#define L2_FHDR_STATUS_TCP_SEGMENT (1<<14)
#define L2_FHDR_STATUS_UDP_DATAGRAM (1<<15)
#define L2_FHDR_STATUS_SPLIT (1<<16)
#define L2_FHDR_ERRORS_BAD_CRC (1<<17)
#define L2_FHDR_ERRORS_PHY_DECODE (1<<18)
#define L2_FHDR_ERRORS_ALIGNMENT (1<<19)
@ -6537,6 +6538,7 @@ struct bnx2 {
u32 rx_buf_use_size; /* useable size */
u32 rx_buf_size; /* with alignment */
u32 rx_copy_thresh;
u32 rx_jumbo_thresh;
u32 rx_max_ring_idx;
u32 rx_max_pg_ring_idx;