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Move magic PCIe workaround constant to header - add appropriate comment

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Suggested by: jfvogel
This commit is contained in:
Kip Macy 2006-11-23 05:43:39 +00:00
parent 9f238ea6d9
commit 21e3069792
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=164546
2 changed files with 7 additions and 1 deletions
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2
sys/dev/em/if_em.c
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@ -2579,7 +2579,7 @@ em_allocate_transmit_structures(struct adapter *adapter)
if ((adapter->hw.mac_type > em_82544) &&
(adapter->hw.mac_type != em_82547)) {
size = EM_TSO_SIZE;
segsize = 4096; /* page size isn't always 4k */
segsize = EM_TSO_PCIE_SEGMENT_SIZE;
}
if ((error = bus_dma_tag_create(bus_get_dma_tag(dev), /* parent */

6
sys/dev/em/if_em.h
View File

@ -181,6 +181,12 @@ POSSIBILITY OF SUCH DAMAGE.
*/
/* #define EM_MASTER_SLAVE 2 */
/*
* Limitation of some PCIe chipsets when using TSO
*/
#define EM_TSO_PCIE_SEGMENT_SIZE 4096
/* Tunables -- End */
#define AUTONEG_ADV_DEFAULT (ADVERTISE_10_HALF | ADVERTISE_10_FULL | \