From: Dean Nelson <dnel...@redhat.com> Date: > The Cavium thunder nicvf driver supports rx/tx rings of up to 65536 entries > per. > The number of entires are stored in the q_len member of struct q_desc_mem. The > problem is that q_len being a u16, results in 65536 becoming 0. > > In getting pointers to descriptors in the rings, the driver uses q_len minus 1 > as a mask after incrementing the pointer, in order to go back to the beginning > and not go past the end of the ring. > > With the q_len set to 0 the mask is no longer correct and the driver does go > beyond the end of the ring, causing various ills. Usually the first thing that > shows up is a "NETDEV WATCHDOG: enP2p1s0f1 (nicvf): transmit queue 7 timed > out" > warning. > > This patch remedies the problem by changing q_len to a u32. > > Signed-off-by: Dean Nelson <dnel...@redhat.com>
Applied, thanks. Another way to solve this could have been to encode that length as "length - 1"
