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author | David S. Miller <davem@davemloft.net> | 2010-05-31 00:10:35 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2010-05-31 00:10:35 -0700 |
commit | 92b4522f72916ff2675060e29e4b24cf26ab59ce (patch) | |
tree | 8424a1c550a98ce09f127425fde9b7b5f2f5027a /drivers/net/fs_enet/mac-fcc.c | |
parent | 67a3e12b05e055c0415c556a315a3d3eb637e29e (diff) | |
parent | 2903037400a26e7c0cc93ab75a7d62abfacdf485 (diff) | |
download | kernel_samsung_smdk4412-92b4522f72916ff2675060e29e4b24cf26ab59ce.zip kernel_samsung_smdk4412-92b4522f72916ff2675060e29e4b24cf26ab59ce.tar.gz kernel_samsung_smdk4412-92b4522f72916ff2675060e29e4b24cf26ab59ce.tar.bz2 |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'drivers/net/fs_enet/mac-fcc.c')
-rw-r--r-- | drivers/net/fs_enet/mac-fcc.c | 49 |
1 files changed, 43 insertions, 6 deletions
diff --git a/drivers/net/fs_enet/mac-fcc.c b/drivers/net/fs_enet/mac-fcc.c index 5d45084..48e91b6 100644 --- a/drivers/net/fs_enet/mac-fcc.c +++ b/drivers/net/fs_enet/mac-fcc.c @@ -504,17 +504,54 @@ static int get_regs_len(struct net_device *dev) } /* Some transmit errors cause the transmitter to shut - * down. We now issue a restart transmit. Since the - * errors close the BD and update the pointers, the restart - * _should_ pick up without having to reset any of our - * pointers either. Also, To workaround 8260 device erratum - * CPM37, we must disable and then re-enable the transmitter - * following a Late Collision, Underrun, or Retry Limit error. + * down. We now issue a restart transmit. + * Also, to workaround 8260 device erratum CPM37, we must + * disable and then re-enable the transmitterfollowing a + * Late Collision, Underrun, or Retry Limit error. + * In addition, tbptr may point beyond BDs beyond still marked + * as ready due to internal pipelining, so we need to look back + * through the BDs and adjust tbptr to point to the last BD + * marked as ready. This may result in some buffers being + * retransmitted. */ static void tx_restart(struct net_device *dev) { struct fs_enet_private *fep = netdev_priv(dev); fcc_t __iomem *fccp = fep->fcc.fccp; + const struct fs_platform_info *fpi = fep->fpi; + fcc_enet_t __iomem *ep = fep->fcc.ep; + cbd_t __iomem *curr_tbptr; + cbd_t __iomem *recheck_bd; + cbd_t __iomem *prev_bd; + cbd_t __iomem *last_tx_bd; + + last_tx_bd = fep->tx_bd_base + (fpi->tx_ring * sizeof(cbd_t)); + + /* get the current bd held in TBPTR and scan back from this point */ + recheck_bd = curr_tbptr = (cbd_t __iomem *) + ((R32(ep, fen_genfcc.fcc_tbptr) - fep->ring_mem_addr) + + fep->ring_base); + + prev_bd = (recheck_bd == fep->tx_bd_base) ? last_tx_bd : recheck_bd - 1; + + /* Move through the bds in reverse, look for the earliest buffer + * that is not ready. Adjust TBPTR to the following buffer */ + while ((CBDR_SC(prev_bd) & BD_ENET_TX_READY) != 0) { + /* Go back one buffer */ + recheck_bd = prev_bd; + + /* update the previous buffer */ + prev_bd = (prev_bd == fep->tx_bd_base) ? last_tx_bd : prev_bd - 1; + + /* We should never see all bds marked as ready, check anyway */ + if (recheck_bd == curr_tbptr) + break; + } + /* Now update the TBPTR and dirty flag to the current buffer */ + W32(ep, fen_genfcc.fcc_tbptr, + (uint) (((void *)recheck_bd - fep->ring_base) + + fep->ring_mem_addr)); + fep->dirty_tx = recheck_bd; C32(fccp, fcc_gfmr, FCC_GFMR_ENT); udelay(10); |