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Code Issues Releases Activity

solid reports that it is buggy *and* that it slows down transmit

Browse Source 
speed.

Buggy report:           Matt Dillon & others
Slowness report:        I can't find the e-mail

MFC After: 1 minute
This commit is contained in:
Mike Silbersack 2004-03-19 23:20:23 +00:00
parent 44a3d34206
commit 8affb13446
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=127213
1 changed files with 20 additions and 0 deletions
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20
sys/pci/if_xl.c
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@ -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);
}