qede: Postpone reallocation until NAPI end
authorMintz, Yuval <Yuval.Mintz@cavium.com>
Sun, 1 Jan 2017 11:57:04 +0000 (13:57 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 2 Jan 2017 02:02:14 +0000 (21:02 -0500)
commite3eef7ee0201dbe5f4fc011b58d26228b57736ce
tree6d4c2f2cc6cab6bd563ffc3a3f10d4f5827b82c2
parente1d32acbcbd35af5264acc70ff03bf8da9e447a8
qede: Postpone reallocation until NAPI end

During Rx flow driver allocates a replacement buffer each time
it consumes an Rx buffer. Failing to do so, it would consume the
currently processed buffer and re-post it on the ring.
As a result, the Rx ring is always completely full [from driver POV].

We now allow the Rx ring to shorten by doing the re-allocations
at the end of the NAPI run. The only limitation is that we still want to
make sure each time we reallocate that we'd still have sufficient
elements in the Rx ring to guarantee that FW would be able to post
additional data and trigger an interrupt.

Signed-off-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/qlogic/qede/qede.h
drivers/net/ethernet/qlogic/qede/qede_fp.c
drivers/net/ethernet/qlogic/qede/qede_main.c