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authorDavid S. Miller <davem@davemloft.net>2005-05-18 22:46:34 -0700
committerDavid S. Miller <davem@davemloft.net>2005-05-18 22:46:34 -0700
commitfac9b83ea79aa3112ed245d9a4fc2a5c3ec2b7ec (patch)
tree14749e6e5e0abdfb707b41dad714e36246e6cff8 /drivers/net/tg3.h
parent05d3794aa8bd3b2c9f7920a05003c331cdeb75c5 (diff)
downloadop-kernel-dev-fac9b83ea79aa3112ed245d9a4fc2a5c3ec2b7ec.zip
op-kernel-dev-fac9b83ea79aa3112ed245d9a4fc2a5c3ec2b7ec.tar.gz
[TG3]: Add tagged status support.
When supported, use the TAGGED interrupt processing support the chip provides. In this mode, instead of a "on/off" binary semaphore, an incrementing tag scheme is used to ACK interrupts. All MSI supporting chips support TAGGED mode, so the tg3_msi() interrupt handler uses it unconditionally. This invariant is verified when MSI support is tested. Since we can invoke tg3_poll() multiple times per interrupt under high packet load, we fetch a new copy of the tag value in the status block right before we actually do the work. Also, because the tagged status tells the chip exactly which work we have processed, we can make two optimizations: 1) tg3_restart_ints() need not check tg3_has_work() 2) the tg3_timer() need not poke the chip 10 times per second to keep from losing interrupt events Based upon valuable feedback from Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tg3.h')
-rw-r--r--drivers/net/tg3.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/tg3.h b/drivers/net/tg3.h
index 8de6f21..44c6516 100644
--- a/drivers/net/tg3.h
+++ b/drivers/net/tg3.h
@@ -2023,6 +2023,7 @@ struct tg3 {
struct tg3_hw_status *hw_status;
dma_addr_t status_mapping;
+ u32 last_tag;
u32 msg_enable;
@@ -2068,6 +2069,7 @@ struct tg3 {
u32 rx_offset;
u32 tg3_flags;
+#define TG3_FLAG_TAGGED_STATUS 0x00000001
#define TG3_FLAG_TXD_MBOX_HWBUG 0x00000002
#define TG3_FLAG_RX_CHECKSUMS 0x00000004
#define TG3_FLAG_USE_LINKCHG_REG 0x00000008
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