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| author | kmacy <kmacy@FreeBSD.org> | 2006-11-23 05:43:39 +0000 |
|---|---|---|
| committer | kmacy <kmacy@FreeBSD.org> | 2006-11-23 05:43:39 +0000 |
| commit | 9dfce31659b8aa731b53727f7cdde96741afe51e (patch) | |
| tree | 5cc802b46a36f49fc39f8feff4898b541f2e9857 | |
| parent | 16e09012c1e4f12bd31340d80dbfb7b38c176327 (diff) | |
| download | FreeBSD-src-9dfce31659b8aa731b53727f7cdde96741afe51e.zip FreeBSD-src-9dfce31659b8aa731b53727f7cdde96741afe51e.tar.gz | |
Move magic PCIe workaround constant to header - add appropriate comment
Suggested by: jfvogel
| -rw-r--r-- | sys/dev/em/if_em.c | 2 | ||||
| -rw-r--r-- | sys/dev/em/if_em.h | 6 |
2 files changed, 7 insertions, 1 deletions
diff --git a/sys/dev/em/if_em.c b/sys/dev/em/if_em.c index 0033c50..a477cf0 100644 --- a/sys/dev/em/if_em.c +++ b/sys/dev/em/if_em.c @@ -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 */ diff --git a/sys/dev/em/if_em.h b/sys/dev/em/if_em.h index 54b3f1d..42b85a5 100644 --- a/sys/dev/em/if_em.h +++ b/sys/dev/em/if_em.h @@ -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 | \ |
