diff options
| -rw-r--r-- | sys/pci/if_xl.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/sys/pci/if_xl.c b/sys/pci/if_xl.c index 019f8e5..032de52 100644 --- a/sys/pci/if_xl.c +++ b/sys/pci/if_xl.c @@ -139,7 +139,21 @@ MODULE_DEPEND(xl, miibus, 1, 1, 1); #include <pci/if_xlreg.h> +/* + * TX Checksumming is disabled by default for two reasons: + * - TX Checksumming will occasionally produce corrupt packets + * - TX Checksumming seems to reduce performance + * + * Only 905B/C cards were reported to have this problem, it is possible + * that later chips _may_ be immune. + */ +#define XL905B_TXCSUM_BROKEN 1 + +#ifdef XL905B_TXCSUM_BROKEN +#define XL905B_CSUM_FEATURES 0 +#else #define XL905B_CSUM_FEATURES (CSUM_IP | CSUM_TCP | CSUM_UDP) +#endif /* * Various supported device vendors/types and their names. @@ -1597,7 +1611,11 @@ xl_attach(dev) if (sc->xl_type == XL_TYPE_905B) { ifp->if_start = xl_start_90xB; ifp->if_hwassist = XL905B_CSUM_FEATURES; +#ifdef XL905B_TXCSUM_BROKEN + ifp->if_capabilities |= IFCAP_RXCSUM; +#else ifp->if_capabilities |= IFCAP_HWCSUM; +#endif } else ifp->if_start = xl_start; ifp->if_watchdog = xl_watchdog; @@ -2506,6 +2524,7 @@ xl_encap(sc, c, m_head) if (sc->xl_type == XL_TYPE_905B) { status = XL_TXSTAT_RND_DEFEAT; +#ifndef XL905B_TXCSUM_BROKEN if (m_head->m_pkthdr.csum_flags) { if (m_head->m_pkthdr.csum_flags & CSUM_IP) status |= XL_TXSTAT_IPCKSUM; @@ -2514,6 +2533,7 @@ xl_encap(sc, c, m_head) if (m_head->m_pkthdr.csum_flags & CSUM_UDP) status |= XL_TXSTAT_UDPCKSUM; } +#endif c->xl_ptr->xl_status = htole32(status); } |
