diff options
author | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2009-09-09 18:00:13 +0000 |
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committer | patacongo <patacongo@7fd9a85b-ad96-42d3-883c-3090e2eb8679> | 2009-09-09 18:00:13 +0000 |
commit | cdb69d233cf696b92a13ffeebfe5ef16161c3609 (patch) | |
tree | db2080f7e6eea0498dafc81c28d025c86dfab75a /nuttx/arch/arm/src | |
parent | c9fd358783bfb97ab30efc4e617ac576d36ee86d (diff) |
This two FIFO handling bugs in LM3S ethernet driver
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@2031 7fd9a85b-ad96-42d3-883c-3090e2eb8679
Diffstat (limited to 'nuttx/arch/arm/src')
-rw-r--r-- | nuttx/arch/arm/src/lm3s/lm3s_ethernet.c | 37 |
1 files changed, 27 insertions, 10 deletions
diff --git a/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c b/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c index d626166b56..86052eb510 100644 --- a/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c +++ b/nuttx/arch/arm/src/lm3s/lm3s_ethernet.c @@ -127,6 +127,14 @@ #define LM3S_RCTCL_SETBITS (LM3S_AMUL_SETBITS|LM3S_PRMS_SETBITS|LM3S_BADCRC_SETBITS) #define LM3S_RCTCL_CLRBITS (LM3S_AMUL_CLRBITS|LM3S_PRMS_CLRBITS|LM3S_BADCRC_CLRBITS) +/* CONFIG_LM3S_DUMPPACKET will dump the contents of each packet to the console. */ + +#ifdef CONFIG_LM3S_DUMPPACKET +# define lm3s_dumppacket(m,a,n) lib_dumpbuffer(m,a,n) +#else +# define lm3s_dumppacket(m,a,n) +#endif + /* TX poll deley = 1 seconds. CLK_TCK is the number of clock ticks per second */ #define LM3S_WDDELAY (1*CLK_TCK) @@ -483,6 +491,7 @@ static int lm3s_transmit(struct lm3s_driver_s *priv) /* Increment statistics */ EMAC_STAT(priv, tx_packets); + lm3s_dumppacket("Transmit packet", priv->ld_dev.d_buf, priv->ld_dev.d_len); /* Transfer the packet into the Tx FIFO. The LS 16-bits of the first * 32-bit word written to the Tx FIFO contains the Ethernet payload @@ -495,7 +504,7 @@ static int lm3s_transmit(struct lm3s_driver_s *priv) DEBUGASSERT(pktlen > UIP_LLH_LEN); dbuf = priv->ld_dev.d_buf; - regval = (uint32)(pktlen - 4); + regval = (uint32)(pktlen - 14); regval |= ((uint32)(*dbuf++) << 16); regval |= ((uint32)(*dbuf++) << 24); lm3s_ethout(priv, LM3S_MAC_DATA_OFFSET, regval); @@ -639,7 +648,8 @@ static void lm3s_receive(struct lm3s_driver_s *priv) * word from the FIFO followed by the Ethernet header beginning * in the MS 16-bits of the first word. * - * Pick off the packet length from the first word. + * Pick off the packet length from the first word. This packet length + * includes the len/type field (size 2) and the FCS (size 4). */ regval = lm3s_ethin(priv, LM3S_MAC_DATA_OFFSET); @@ -660,11 +670,11 @@ static void lm3s_receive(struct lm3s_driver_s *priv) ndbg("Bad packet size dropped (%d)\n", pktlen); EMAC_STAT(priv, rx_pktsize); - /* This is the number of bytes and words left to read (including, - * the final, possibly partial word). + /* The number of bytes and words left to read is pktlen - 4 (including, + * the final, possibly partial word) because we've already read 4 bytes. */ - wordlen = (pktlen + 1) >> 4; + wordlen = (pktlen - 1) >> 2; /* Read and discard the remaining words in the FIFO */ @@ -683,9 +693,12 @@ static void lm3s_receive(struct lm3s_driver_s *priv) *dbuf++ = (ubyte)((regval >> 16) & 0xff); *dbuf++ = (ubyte)((regval >> 24) & 0xff); - /* Read all of the whole, 32-bit values in the middle of the packet */ + /* Read all of the whole, 32-bit values in the middle of the packet. + * We've already read the length (2 bytes) plus the first two bytes + * of data + */ - for (bytesleft = pktlen - 2; bytesleft > 3; bytesleft -= 4, dbuf += 4) + for (bytesleft = pktlen - 4; bytesleft > 3; bytesleft -= 4, dbuf += 4) { /* Transfer a whole word to the user buffer. Note, the user * buffer may be un-aligned. @@ -717,9 +730,13 @@ static void lm3s_receive(struct lm3s_driver_s *priv) } } - /* Pass the packet length to uIP */ + lm3s_dumppacket("Received packet", priv->ld_dev.d_buf, pktlen); + + /* Pass the packet length to uIP MINUS 2 bytes for the length and + * 4 bytes for the FCS. + */ - priv->ld_dev.d_len = pktlen; + priv->ld_dev.d_len = pktlen - 6; /* We only accept IP packets of the configured type and ARP packets */ @@ -916,7 +933,7 @@ static void lm3s_txtimeout(int argc, uint32 arg, ...) { struct lm3s_driver_s *priv = (struct lm3s_driver_s *)arg; - /* Increment statistics and dump debug info */ + /* Increment statistics */ ndbg("Tx timeout\n"); EMAC_STAT(priv, tx_timeouts); |