From a64304f0a2cae8ce9ff71baecbad821613229cfe Mon Sep 17 00:00:00 2001 From: Arend van Spriel Date: Tue, 15 Oct 2013 15:44:56 +0200 Subject: [PATCH] brcmfmac: fix brcmf_sdio_txpkt_prep() for host without sg support 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 Reviewed-by: Hante Meuleman Reviewed-by: Pieter-Paul Giesberts Signed-off-by: Arend van Spriel Signed-off-by: John W. Linville --- .../wireless/brcm80211/brcmfmac/dhd_sdio.c | 106 +++++++++++------- 1 file changed, 64 insertions(+), 42 deletions(-) diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c index ab1c919f7b08..c9277011a1bc 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c @@ -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() && -- 2.30.2