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brcmfmac: fix brcmf_sdio_txpkt_prep() for host without sg support

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When running on a host controller that does not support scatter-gather
transfers the function brcmf_sdio_txpkt_prep() should not add tail
padding buffers.

Reviewed-by: Franky Lin <frankyl@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Arend van Spriel 2013-10-15 15:44:56 +02:00 committed by John W. Linville
parent c8cce1f9a7
commit a64304f0a2
1 changed files with 64 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

106
drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
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@ -1880,6 +1880,56 @@ brcmf_sdbrcm_wait_event_wakeup(struct brcmf_sdio *bus)
/* bit mask of data length chopped from the previous packet */
#define ALIGN_SKB_CHOP_LEN_MASK 0x7fff
static int brcmf_sdio_txpkt_prep_sg(struct brcmf_sdio_dev *sdiodev,
struct sk_buff_head *pktq,
struct sk_buff *pkt, uint chan)
{
struct sk_buff *pkt_pad;
u16 tail_pad, tail_chop, sg_align;
unsigned int blksize;
u8 *dat_buf;
int ntail;
blksize = sdiodev->func[SDIO_FUNC_2]->cur_blksize;
sg_align = 4;
if (sdiodev->pdata && sdiodev->pdata->sd_sgentry_align > 4)
sg_align = sdiodev->pdata->sd_sgentry_align;
/* sg entry alignment should be a divisor of block size */
WARN_ON(blksize % sg_align);
/* Check tail padding */
pkt_pad = NULL;
tail_chop = pkt->len % sg_align;
tail_pad = sg_align - tail_chop;
tail_pad += blksize - (pkt->len + tail_pad) % blksize;
if (skb_tailroom(pkt) < tail_pad && pkt->len > blksize) {
pkt_pad = brcmu_pkt_buf_get_skb(tail_pad + tail_chop);
if (pkt_pad == NULL)
return -ENOMEM;
memcpy(pkt_pad->data,
pkt->data + pkt->len - tail_chop,
tail_chop);
*(u32 *)(pkt_pad->cb) = ALIGN_SKB_FLAG + tail_chop;
skb_trim(pkt, pkt->len - tail_chop);
__skb_queue_after(pktq, pkt, pkt_pad);
} else {
ntail = pkt->data_len + tail_pad -
(pkt->end - pkt->tail);
if (skb_cloned(pkt) || ntail > 0)
if (pskb_expand_head(pkt, 0, ntail, GFP_ATOMIC))
return -ENOMEM;
if (skb_linearize(pkt))
return -ENOMEM;
dat_buf = (u8 *)(pkt->data);
__skb_put(pkt, tail_pad);
}
if (pkt_pad)
return pkt->len + tail_chop;
else
return pkt->len - tail_pad;
}
/**
* brcmf_sdio_txpkt_prep - packet preparation for transmit
* @bus: brcmf_sdio structure pointer
@ -1896,24 +1946,16 @@ static int
brcmf_sdio_txpkt_prep(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
uint chan)
{
u16 head_pad, tail_pad, tail_chop, head_align, sg_align;
int ntail;
struct sk_buff *pkt_next, *pkt_new;
u16 head_pad, head_align;
struct sk_buff *pkt_next;
u8 *dat_buf;
unsigned blksize = bus->sdiodev->func[SDIO_FUNC_2]->cur_blksize;
int err;
struct brcmf_sdio_hdrinfo hd_info = {0};
/* SDIO ADMA requires at least 32 bit alignment */
head_align = 4;
sg_align = 4;
if (bus->sdiodev->pdata) {
head_align = bus->sdiodev->pdata->sd_head_align > 4 ?
bus->sdiodev->pdata->sd_head_align : 4;
sg_align = bus->sdiodev->pdata->sd_sgentry_align > 4 ?
bus->sdiodev->pdata->sd_sgentry_align : 4;
}
/* sg entry alignment should be a divisor of block size */
WARN_ON(blksize % sg_align);
if (bus->sdiodev->pdata && bus->sdiodev->pdata->sd_head_align > 4)
head_align = bus->sdiodev->pdata->sd_head_align;
pkt_next = pktq->next;
dat_buf = (u8 *)(pkt_next->data);
@ -1932,40 +1974,20 @@ brcmf_sdio_txpkt_prep(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
memset(dat_buf, 0, head_pad + bus->tx_hdrlen);
}
/* Check tail padding */
pkt_new = NULL;
tail_chop = pkt_next->len % sg_align;
tail_pad = sg_align - tail_chop;
tail_pad += blksize - (pkt_next->len + tail_pad) % blksize;
if (skb_tailroom(pkt_next) < tail_pad && pkt_next->len > blksize) {
pkt_new = brcmu_pkt_buf_get_skb(tail_pad + tail_chop);
if (pkt_new == NULL)
return -ENOMEM;
memcpy(pkt_new->data,
pkt_next->data + pkt_next->len - tail_chop,
tail_chop);
*(u32 *)(pkt_new->cb) = ALIGN_SKB_FLAG + tail_chop;
skb_trim(pkt_next, pkt_next->len - tail_chop);
__skb_queue_after(pktq, pkt_next, pkt_new);
if (bus->sdiodev->sg_support && pktq->qlen > 1) {
err = brcmf_sdio_txpkt_prep_sg(bus->sdiodev, pktq,
pkt_next, chan);
if (err < 0)
return err;
hd_info.len = (u16)err;
} else {
ntail = pkt_next->data_len + tail_pad -
(pkt_next->end - pkt_next->tail);
if (skb_cloned(pkt_next) || ntail > 0)
if (pskb_expand_head(pkt_next, 0, ntail, GFP_ATOMIC))
return -ENOMEM;
if (skb_linearize(pkt_next))
return -ENOMEM;
dat_buf = (u8 *)(pkt_next->data);
__skb_put(pkt_next, tail_pad);
hd_info.len = pkt_next->len;
}
/* Now prep the header */
if (pkt_new)
hd_info.len = pkt_next->len + tail_chop;
else
hd_info.len = pkt_next->len - tail_pad;
hd_info.channel = chan;
hd_info.dat_offset = head_pad + bus->tx_hdrlen;
/* Now fill the header */
brcmf_sdio_hdpack(bus, dat_buf, &hd_info);
if (BRCMF_BYTES_ON() &&