The device maintains a CAM mapping of the internal status blocks and the various PF/VF MSI-x vector mappings. During initialization, the driver reads the HW memory and constructs a shadow SW implementation which it would later use for manipulation of interrupts. E.g., when enabling VFs and setting their MSI-x tables.
The driver currently has some very strict assumptions on the order the entries are placed in the CAM. Specifically, it assumes that all entries belonging to a PF would be consecutive and in-order in the CAM, and that the VF entries would then follow. But there's no actual HW constraint enforcing this assumption [although management firmware does set it accordingly to same assumption initially]. Since the CAM is re-configurable, there are now SW flows employeed by other OSes that might cause the assumption to be invalid. Such flows allow the PF to forfeit some of it's available interrupts in favor of its VFs or vice versa. While those are not employeed today by qed, we want to relax the assumptions as much as we can - both to allow functionality after PDA as well as allowing future compatibility where the driver would be loaded after a newer one has 'dirtied' the CAM configuration. In addition to patches meant for the above relaxation, the series also contains various cleanups & refactoring for interrupt logic [most of which is !semantic]. Dave, Please consider applying this series to `net-next'. Thanks, Yuval Yuval Mintz (11): qed: Make qed_int_cau_conf_pi() static qed: Minor refactoring in interrupt code qed: IGU read revised qed: Distinguish between sb_id and igu_sb_id qed: Add aux. function translating sb_id -> igu_sb_id qed: Encapsulate interrupt counters in struct qed: Remove assumption on SB order in IGU qed: Provide auxiliary for getting free VF SB qed: Hold a single array for SBs qed: Reset IGU CAM to default on init qed: No need to reset SBs on IOV init drivers/net/ethernet/qlogic/qed/qed.h | 4 - drivers/net/ethernet/qlogic/qed/qed_dev.c | 49 +-- drivers/net/ethernet/qlogic/qed/qed_fcoe.c | 5 +- drivers/net/ethernet/qlogic/qed/qed_int.c | 605 +++++++++++++++++----------- drivers/net/ethernet/qlogic/qed/qed_int.h | 93 ++--- drivers/net/ethernet/qlogic/qed/qed_iscsi.c | 2 +- drivers/net/ethernet/qlogic/qed/qed_main.c | 2 +- drivers/net/ethernet/qlogic/qed/qed_roce.c | 5 +- drivers/net/ethernet/qlogic/qed/qed_sriov.c | 91 ++--- drivers/net/ethernet/qlogic/qed/qed_sriov.h | 5 +- drivers/net/ethernet/qlogic/qed/qed_vf.c | 27 +- drivers/net/ethernet/qlogic/qed/qed_vf.h | 18 + include/linux/qed/qed_if.h | 12 +- 13 files changed, 527 insertions(+), 391 deletions(-) -- 2.9.4
