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Date: Tue, 3 Sep 2013 02:33:53 +0000
From: Li Frank-B20596 <B20596@...escale.com>
To: Duan Fugang-B38611 <B38611@...escale.com>,
"davem@...emloft.net" <davem@...emloft.net>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: RE: [PATCH] net: fec: fix the error to get the previous BD entry
> Bug: error to get the previous BD entry. When the current BD is the first BD,
> the previous BD entry must be the last BD, not "bdp - 1" in current logic.
>
> V3:
> * Restore the API name because David suggest to use fec_enet_
> prefix for all function in fec driver.
> So, change next_bd() -> fec_enet_get_nextdesc()
> change pre_bd() -> fec_enet_get_prevdesc()
> * Reduce the two APIs parameters for easy to call.
>
> V2:
> * Add tx_ring_size and rx_ring_size to struct fec_enet_private.
> * Replace api fec_enet_get_nextdesc() with next_bd().
> Replace api fec_enet_get_prevdesc() with pre_bd().
>
> * Move all ring size check logic to next_bd() and pre_bd(), which
> simplifies the code redundancy.
>
> V1:
> * Add BD ring size check to get the previous BD entry in correctly.
>
> Reviewed-by: Li Frank <B20596@...escale.com>
> Signed-off-by: Fugang Duan <B38611@...escale.com>
> ---
> drivers/net/ethernet/freescale/fec.h | 3 +
> drivers/net/ethernet/freescale/fec_main.c | 120 ++++++++++++++++++---------
> --
> 2 files changed, 77 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/net/ethernet/freescale/fec.h
> b/drivers/net/ethernet/freescale/fec.h
> index ae23600..0120217 100644
> --- a/drivers/net/ethernet/freescale/fec.h
> +++ b/drivers/net/ethernet/freescale/fec.h
> @@ -296,6 +296,9 @@ struct fec_enet_private {
> /* The ring entries to be free()ed */
> struct bufdesc *dirty_tx;
>
> + unsigned short tx_ring_size;
> + unsigned short rx_ring_size;
> +
> struct platform_device *pdev;
>
> int opened;
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 4ea1555..d5d8984 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -239,22 +239,57 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
>
> static int mii_cnt;
>
> -static struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp, int is_ex)
> +static inline
> +struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp, struct
> +fec_enet_private *fep)
> {
> - struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
> - if (is_ex)
> - return (struct bufdesc *)(ex + 1);
> + struct bufdesc *new_bd = bdp + 1;
> + struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp + 1;
> + struct bufdesc_ex *ex_base;
> + struct bufdesc *base;
> + int ring_size;
> +
> + if (bdp >= fep->tx_bd_base) {
> + base = fep->tx_bd_base;
> + ring_size = fep->tx_ring_size;
> + ex_base = (struct bufdesc_ex *)fep->tx_bd_base;
> + } else {
> + base = fep->rx_bd_base;
> + ring_size = fep->rx_ring_size;
> + ex_base = (struct bufdesc_ex *)fep->rx_bd_base;
> + }
> +
> + if (fep->bufdesc_ex)
> + return (struct bufdesc *)((ex_new_bd >= (ex_base + ring_size)) ?
> + (ex_new_bd - ring_size) : ex_new_bd);
I think "exbase:ex_new_bd" is better
> else
> - return bdp + 1;
> + return (new_bd >= (base + ring_size)) ?
> + (new_bd - ring_size) : new_bd;
I think "base:new_bd" is better.
> }
>
> -static struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, int is_ex)
> +static inline
> +struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, struct
> +fec_enet_private *fep)
> {
> - struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
> - if (is_ex)
> - return (struct bufdesc *)(ex - 1);
> + struct bufdesc *new_bd = bdp - 1;
> + struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp - 1;
> + struct bufdesc_ex *ex_base;
> + struct bufdesc *base;
> + int ring_size;
> +
> + if (bdp >= fep->tx_bd_base) {
> + base = fep->tx_bd_base;
> + ring_size = fep->tx_ring_size;
> + ex_base = (struct bufdesc_ex *)fep->tx_bd_base;
> + } else {
> + base = fep->rx_bd_base;
> + ring_size = fep->rx_ring_size;
> + ex_base = (struct bufdesc_ex *)fep->rx_bd_base;
> + }
> +
> + if (fep->bufdesc_ex)
> + return (struct bufdesc *)((ex_new_bd < ex_base) ?
> + (ex_new_bd + ring_size) : ex_new_bd);
> else
> - return bdp - 1;
> + return (new_bd < base) ? (new_bd + ring_size) : new_bd;
> }
>
> static void *swap_buffer(void *bufaddr, int len) @@ -380,7 +415,7 @@
> fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
> }
> }
>
> - bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> + bdp_pre = fec_enet_get_prevdesc(bdp, fep);
> if ((id_entry->driver_data & FEC_QUIRK_ERR006358) &&
> !(bdp_pre->cbd_sc & BD_ENET_TX_READY)) {
> fep->delay_work.trig_tx = true;
> @@ -389,10 +424,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct
> net_device *ndev)
> }
>
> /* If this was the last BD in the ring, start at the beginning again.
> */
> - if (status & BD_ENET_TX_WRAP)
> - bdp = fep->tx_bd_base;
> - else
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
>
> fep->cur_tx = bdp;
>
> @@ -417,18 +449,18 @@ static void fec_enet_bd_init(struct net_device *dev)
>
> /* Initialize the receive buffer descriptors. */
> bdp = fep->rx_bd_base;
> - for (i = 0; i < RX_RING_SIZE; i++) {
> + for (i = 0; i < fep->rx_ring_size; i++) {
>
> /* Initialize the BD for every fragment in the page. */
> if (bdp->cbd_bufaddr)
> bdp->cbd_sc = BD_ENET_RX_EMPTY;
> else
> bdp->cbd_sc = 0;
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> }
>
> /* Set the last buffer to wrap */
> - bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_prevdesc(bdp, fep);
> bdp->cbd_sc |= BD_SC_WRAP;
>
> fep->cur_rx = fep->rx_bd_base;
> @@ -436,7 +468,7 @@ static void fec_enet_bd_init(struct net_device *dev)
> /* ...and the same for transmit */
> bdp = fep->tx_bd_base;
> fep->cur_tx = bdp;
> - for (i = 0; i < TX_RING_SIZE; i++) {
> + for (i = 0; i < fep->tx_ring_size; i++) {
>
> /* Initialize the BD for every fragment in the page. */
> bdp->cbd_sc = 0;
> @@ -445,11 +477,11 @@ static void fec_enet_bd_init(struct net_device *dev)
> fep->tx_skbuff[i] = NULL;
> }
> bdp->cbd_bufaddr = 0;
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> }
>
> /* Set the last buffer to wrap */
> - bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_prevdesc(bdp, fep);
> bdp->cbd_sc |= BD_SC_WRAP;
> fep->dirty_tx = bdp;
> }
> @@ -510,10 +542,10 @@ fec_restart(struct net_device *ndev, int duplex)
> writel(fep->bd_dma, fep->hwp + FEC_R_DES_START);
> if (fep->bufdesc_ex)
> writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc_ex)
> - * RX_RING_SIZE, fep->hwp + FEC_X_DES_START);
> + * fep->rx_ring_size, fep->hwp + FEC_X_DES_START);
> else
> writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc)
> - * RX_RING_SIZE, fep->hwp + FEC_X_DES_START);
> + * fep->rx_ring_size, fep->hwp + FEC_X_DES_START);
>
>
> for (i = 0; i <= TX_RING_MOD_MASK; i++) { @@ -727,10 +759,7 @@
> fec_enet_tx(struct net_device *ndev)
> bdp = fep->dirty_tx;
>
> /* get next bdp of dirty_tx */
> - if (bdp->cbd_sc & BD_ENET_TX_WRAP)
> - bdp = fep->tx_bd_base;
> - else
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
>
> while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
>
> @@ -800,10 +829,7 @@ fec_enet_tx(struct net_device *ndev)
> fep->dirty_tx = bdp;
>
> /* Update pointer to next buffer descriptor to be transmitted */
> - if (status & BD_ENET_TX_WRAP)
> - bdp = fep->tx_bd_base;
> - else
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
>
> /* Since we have freed up a buffer, the ring is no longer full
> */
> @@ -994,10 +1020,8 @@ rx_processing_done:
> }
>
> /* Update BD pointer to next entry */
> - if (status & BD_ENET_RX_WRAP)
> - bdp = fep->rx_bd_base;
> - else
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> +
> /* Doing this here will keep the FEC running while we process
> * incoming frames. On a heavily loaded network, we should be
> * able to keep up at the expense of system resources.
> @@ -1663,7 +1687,7 @@ static void fec_enet_free_buffers(struct net_device
> *ndev)
> struct bufdesc *bdp;
>
> bdp = fep->rx_bd_base;
> - for (i = 0; i < RX_RING_SIZE; i++) {
> + for (i = 0; i < fep->rx_ring_size; i++) {
> skb = fep->rx_skbuff[i];
>
> if (bdp->cbd_bufaddr)
> @@ -1671,11 +1695,11 @@ static void fec_enet_free_buffers(struct net_device
> *ndev)
> FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
> if (skb)
> dev_kfree_skb(skb);
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> }
>
> bdp = fep->tx_bd_base;
> - for (i = 0; i < TX_RING_SIZE; i++)
> + for (i = 0; i < fep->tx_ring_size; i++)
> kfree(fep->tx_bounce[i]);
> }
>
> @@ -1687,7 +1711,7 @@ static int fec_enet_alloc_buffers(struct net_device
> *ndev)
> struct bufdesc *bdp;
>
> bdp = fep->rx_bd_base;
> - for (i = 0; i < RX_RING_SIZE; i++) {
> + for (i = 0; i < fep->rx_ring_size; i++) {
> skb = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
> if (!skb) {
> fec_enet_free_buffers(ndev);
> @@ -1704,15 +1728,15 @@ static int fec_enet_alloc_buffers(struct net_device
> *ndev)
> ebdp->cbd_esc = BD_ENET_RX_INT;
> }
>
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> }
>
> /* Set the last buffer to wrap. */
> - bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_prevdesc(bdp, fep);
> bdp->cbd_sc |= BD_SC_WRAP;
>
> bdp = fep->tx_bd_base;
> - for (i = 0; i < TX_RING_SIZE; i++) {
> + for (i = 0; i < fep->tx_ring_size; i++) {
> fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
>
> bdp->cbd_sc = 0;
> @@ -1723,11 +1747,11 @@ static int fec_enet_alloc_buffers(struct net_device
> *ndev)
> ebdp->cbd_esc = BD_ENET_TX_INT;
> }
>
> - bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_nextdesc(bdp, fep);
> }
>
> /* Set the last buffer to wrap. */
> - bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
> + bdp = fec_enet_get_prevdesc(bdp, fep);
> bdp->cbd_sc |= BD_SC_WRAP;
>
> return 0;
> @@ -1967,13 +1991,17 @@ static int fec_enet_init(struct net_device *ndev)
> /* Get the Ethernet address */
> fec_get_mac(ndev);
>
> + /* init the tx & rx ring size */
> + fep->tx_ring_size = TX_RING_SIZE;
> + fep->rx_ring_size = RX_RING_SIZE;
> +
> /* Set receive and transmit descriptor base. */
> fep->rx_bd_base = cbd_base;
> if (fep->bufdesc_ex)
> fep->tx_bd_base = (struct bufdesc *)
> - (((struct bufdesc_ex *)cbd_base) + RX_RING_SIZE);
> + (((struct bufdesc_ex *)cbd_base) + fep->rx_ring_size);
> else
> - fep->tx_bd_base = cbd_base + RX_RING_SIZE;
> + fep->tx_bd_base = cbd_base + fep->rx_ring_size;
>
> /* The FEC Ethernet specific entries in the device structure */
> ndev->watchdog_timeo = TX_TIMEOUT;
> --
> 1.7.1
--
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