From: Greg Rose Date: Wed, 5 May 2010 19:57:49 +0000 (+0000) Subject: ixgbevf: Cache PF ack bit in interrupt X-Git-Tag: v2.6.35-rc1~473^2~257 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=08259594e047170923ef11d1482648642bfe606f;p=~shefty%2Frdma-dev.git ixgbevf: Cache PF ack bit in interrupt When the PF acks a message from the VF the VF gets an interrupt. It must cache the ack bit so that polling SW will not miss the ack. Also avoid reading the message buffer on acks because that also will clear the ack bit. Signed-off-by: Greg Rose Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/ixgbevf/ixgbevf_main.c b/drivers/net/ixgbevf/ixgbevf_main.c index 08707402eb1..460c37fee96 100644 --- a/drivers/net/ixgbevf/ixgbevf_main.c +++ b/drivers/net/ixgbevf/ixgbevf_main.c @@ -961,12 +961,28 @@ static irqreturn_t ixgbevf_msix_mbx(int irq, void *data) eicr = IXGBE_READ_REG(hw, IXGBE_VTEICS); IXGBE_WRITE_REG(hw, IXGBE_VTEICR, eicr); + if (!hw->mbx.ops.check_for_ack(hw)) { + /* + * checking for the ack clears the PFACK bit. Place + * it back in the v2p_mailbox cache so that anyone + * polling for an ack will not miss it. Also + * avoid the read below because the code to read + * the mailbox will also clear the ack bit. This was + * causing lost acks. Just cache the bit and exit + * the IRQ handler. + */ + hw->mbx.v2p_mailbox |= IXGBE_VFMAILBOX_PFACK; + goto out; + } + + /* Not an ack interrupt, go ahead and read the message */ hw->mbx.ops.read(hw, &msg, 1); if ((msg & IXGBE_MBVFICR_VFREQ_MASK) == IXGBE_PF_CONTROL_MSG) mod_timer(&adapter->watchdog_timer, round_jiffies(jiffies + 1)); +out: return IRQ_HANDLED; }