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21ca7b57bd
previously always pointing to the default vnet context, to a dynamically changing thread-local one. The currvnet context should be set on entry to networking code via CURVNET_SET() macros, and reverted to previous state via CURVNET_RESTORE(). Recursions on curvnet are permitted, though strongly discuouraged. This change should have no functional impact on nooptions VIMAGE kernel builds, where CURVNET_* macros expand to whitespace. The curthread->td_vnet (aka curvnet) variable's purpose is to be an indicator of the vnet context in which the current network-related operation takes place, in case we cannot deduce the current vnet context from any other source, such as by looking at mbuf's m->m_pkthdr.rcvif->if_vnet, sockets's so->so_vnet etc. Moreover, so far curvnet has turned out to be an invaluable consistency checking aid: it helps to catch cases when sockets, ifnets or any other vnet-aware structures may have leaked from one vnet to another. The exact placement of the CURVNET_SET() / CURVNET_RESTORE() macros was a result of an empirical iterative process, whith an aim to reduce recursions on CURVNET_SET() to a minimum, while still reducing the scope of CURVNET_SET() to networking only operations - the alternative would be calling CURVNET_SET() on each system call entry. In general, curvnet has to be set in three typicall cases: when processing socket-related requests from userspace or from within the kernel; when processing inbound traffic flowing from device drivers to upper layers of the networking stack, and when executing timer-driven networking functions. This change also introduces a DDB subcommand to show the list of all vnet instances. Approved by: julian (mentor) |
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| .. | ||
| cxgb_cpl_io.c | ||
| cxgb_cpl_socket.c | ||
| cxgb_ddp.c | ||
| cxgb_defs.h | ||
| cxgb_l2t.c | ||
| cxgb_l2t.h | ||
| cxgb_listen.c | ||
| cxgb_t3_ddp.h | ||
| cxgb_tcp.h | ||
| cxgb_tcp_offload.c | ||
| cxgb_tcp_offload.h | ||
| cxgb_toepcb.h | ||
| cxgb_tom.c | ||
| cxgb_tom.h | ||
| cxgb_tom_sysctl.c | ||
| cxgb_vm.c | ||
| cxgb_vm.h | ||