[net-next 17/40] ixgbe: setup redirection table for multiple packet buffers
From: Jeff Kirsher <hidden>
Date: 2011-06-07 12:33:25
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: John Fastabend <redacted> Setup RSS redirection table to be compatible with multiple packet buffers. Currently, this works on 82599 devices because the RSS redirection index is masked by the number of queues per packet buffer. This sets the cap on the RSS table to maxq. Signed-off-by: John Fastabend <redacted> Tested-by: Ross Brattain <redacted> Signed-off-by: Jeff Kirsher <redacted> --- drivers/net/ixgbe/ixgbe_main.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 111c3f9..2634c67 100644
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c@@ -2938,6 +2938,10 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter) u32 rxcsum; int i, j; u8 tcs = netdev_get_num_tc(adapter->netdev); + int maxq = adapter->ring_feature[RING_F_RSS].indices; + + if (tcs) + maxq = min(maxq, adapter->num_tx_queues / tcs); /* Fill out hash function seeds */ for (i = 0; i < 10; i++)
@@ -2945,7 +2949,7 @@ static void ixgbe_setup_mrqc(struct ixgbe_adapter *adapter) /* Fill out redirection table */ for (i = 0, j = 0; i < 128; i++, j++) { - if (j == adapter->ring_feature[RING_F_RSS].indices) + if (j == maxq) j = 0; /* reta = 4-byte sliding window of * 0x00..(indices-1)(indices-1)00..etc. */
--
1.7.5.2