From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from 1.mo5.mail-out.ovh.net ([188.165.57.91] helo=mo5.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1U3k7o-0005Ri-57 for barebox@lists.infradead.org; Fri, 08 Feb 2013 09:20:08 +0000 Received: from mail634.ha.ovh.net (b9.ovh.net [213.186.33.59]) by mo5.mail-out.ovh.net (Postfix) with SMTP id 20190102021F for ; Fri, 8 Feb 2013 10:30:24 +0100 (CET) From: Jean-Christophe PLAGNIOL-VILLARD Date: Fri, 8 Feb 2013 10:18:49 +0100 Message-Id: <1360315130-23872-6-git-send-email-plagnioj@jcrosoft.com> In-Reply-To: <1360315130-23872-1-git-send-email-plagnioj@jcrosoft.com> References: <20130208090739.GP19322@game.jcrosoft.org> <1360315130-23872-1-git-send-email-plagnioj@jcrosoft.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 6/7] macb: fix tx ring size To: barebox@lists.infradead.org Cc: Nicolas Ferre the mininal tx ring size is 2 as if one we wrap on the same descriptor and can cause IP lock on GEM (gigabit version) this is always the case Signed-off-by: Nicolas Ferre Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD --- drivers/net/macb.c | 50 ++++++++++++++++++++++++++++++++++---------------- 1 file changed, 34 insertions(+), 16 deletions(-) diff --git a/drivers/net/macb.c b/drivers/net/macb.c index d6b60aa..3a65af7 100644 --- a/drivers/net/macb.c +++ b/drivers/net/macb.c @@ -53,15 +53,17 @@ #define MACB_RX_BUFFER_SIZE 128 #define RX_BUFFER_MULTIPLE 64 /* bytes */ -#define RX_RING_SIZE 32 /* must be power of 2 */ -#define RX_RING_BYTES (sizeof(struct macb_dma_desc) * RX_RING_SIZE) +#define RX_NB_PACKET 10 +#define TX_RING_SIZE 2 /* must be power of 2 */ -#define TX_RING_BYTES (sizeof(struct macb_dma_desc)) +#define RX_RING_BYTES(bp) (sizeof(struct macb_dma_desc) * bp->rx_ring_size) +#define TX_RING_BYTES (sizeof(struct macb_dma_desc) * TX_RING_SIZE) struct macb_device { void __iomem *regs; unsigned int rx_tail; + unsigned int tx_head; unsigned int tx_tail; void *rx_buffer; @@ -86,23 +88,36 @@ static int macb_send(struct eth_device *edev, void *packet, { struct macb_device *macb = edev->priv; unsigned long ctrl; - int ret; - - dev_dbg(macb->dev, "%s\n", __func__); + int ret = 0; + uint64_t start; + unsigned int tx_head = macb->tx_head; ctrl = MACB_BF(TX_FRMLEN, length); - ctrl |= MACB_BIT(TX_LAST) | MACB_BIT(TX_WRAP); + ctrl |= MACB_BIT(TX_LAST); - macb->tx_ring[0].ctrl = ctrl; - macb->tx_ring[0].addr = (ulong)packet; + if (tx_head == (TX_RING_SIZE - 1)) { + ctrl |= MACB_BIT(TX_WRAP); + macb->tx_head = 0; + } else { + macb->tx_head++; + } + + macb->tx_ring[tx_head].ctrl = ctrl; + macb->tx_ring[tx_head].addr = (ulong)packet; barrier(); dma_flush_range((ulong) packet, (ulong)packet + length); macb_writel(macb, NCR, MACB_BIT(TE) | MACB_BIT(RE) | MACB_BIT(TSTART)); - ret = wait_on_timeout(100 * MSECOND, - !(macb->tx_ring[0].ctrl & MACB_BIT(TX_USED))); - - ctrl = macb->tx_ring[0].ctrl; + start = get_time_ns(); + ret = -ETIMEDOUT; + do { + barrier(); + ctrl = macb->tx_ring[0].ctrl; + if (ctrl & MACB_BIT(TX_USED)) { + ret = 0; + break; + } + } while (!is_timeout(start, 100 * MSECOND)); if (ctrl & MACB_BIT(TX_UNDERRUN)) dev_err(macb->dev, "TX underrun\n"); @@ -244,10 +259,13 @@ static void macb_init(struct macb_device *macb) } macb->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP); - macb->tx_ring[0].addr = 0; - macb->tx_ring[0].ctrl = MACB_BIT(TX_USED) | MACB_BIT(TX_WRAP); + for (i = 0; i < TX_RING_SIZE; i++) { + macb->tx_ring[i].addr = 0; + macb->tx_ring[i].ctrl = MACB_BIT(TX_USED); + } + macb->tx_ring[TX_RING_SIZE - 1].addr |= MACB_BIT(TX_WRAP); - macb->rx_tail = macb->tx_tail = 0; + macb->rx_tail = macb->tx_head = macb->tx_tail = 0; macb_writel(macb, RBQP, (ulong)macb->rx_ring); macb_writel(macb, TBQP, (ulong)macb->tx_ring); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox