Fib algo: extend KPI by allowing algo to set datapath pointers.
Some algorithms may require updating datapath and control plane algo pointers after the (batched) updates. Export fib_set_datapath_ptr() to allow setting the new datapath function or data pointer from the algo. Add fib_set_algo_ptr() to allow updating algo control plane pointer from the algo. Add fib_epoch_call() epoch(9) wrapper to simplify freeing old datapath state. Reviewed by: zec Differential Revision: https://reviews.freebsd.org/D29799 MFC after: 1 week
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@ -197,7 +197,6 @@ static bool rebuild_fd(struct fib_data *fd, const char *reason);
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static bool rebuild_fd_flm(struct fib_data *fd, struct fib_lookup_module *flm_new);
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static void handle_fd_callout(void *_data);
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static void destroy_fd_instance_epoch(epoch_context_t ctx);
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static enum flm_op_result attach_datapath(struct fib_data *fd);
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static bool is_idx_free(struct fib_data *fd, uint32_t index);
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static void set_algo_fixed(struct rib_head *rh);
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static bool is_algo_fixed(struct rib_head *rh);
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@ -1014,8 +1013,7 @@ schedule_destroy_fd_instance(struct fib_data *fd, bool in_callout)
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*/
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callout_stop(&fd->fd_callout);
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epoch_call(net_epoch_preempt, destroy_fd_instance_epoch,
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&fd->fd_epoch_ctx);
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fib_epoch_call(destroy_fd_instance_epoch, &fd->fd_epoch_ctx);
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return (0);
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}
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@ -1237,8 +1235,10 @@ setup_fd_instance(struct fib_lookup_module *flm, struct rib_head *rh,
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for (int i = 0; i < FIB_MAX_TRIES; i++) {
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result = try_setup_fd_instance(flm, rh, prev_fd, &new_fd);
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if ((result == FLM_SUCCESS) && attach)
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result = attach_datapath(new_fd);
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if ((result == FLM_SUCCESS) && attach) {
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if (!fib_set_datapath_ptr(new_fd, &new_fd->fd_dp))
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result = FLM_REBUILD;
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}
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if ((prev_fd != NULL) && (prev_fd != orig_fd)) {
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schedule_destroy_fd_instance(prev_fd, false);
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@ -1546,32 +1546,33 @@ get_fib_dp_header(struct fib_dp *dp)
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/*
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* Replace per-family index pool @pdp with a new one which
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* contains updated callback/algo data from @fd.
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* Returns 0 on success.
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* Returns true on success.
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*/
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static enum flm_op_result
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replace_rtables_family(struct fib_dp **pdp, struct fib_data *fd)
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static bool
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replace_rtables_family(struct fib_dp **pdp, struct fib_data *fd, struct fib_dp *dp)
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{
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struct fib_dp_header *new_fdh, *old_fdh;
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NET_EPOCH_ASSERT();
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FD_PRINTF(LOG_DEBUG, fd, "[vnet %p] replace with f:%p arg:%p",
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curvnet, fd->fd_dp.f, fd->fd_dp.arg);
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curvnet, dp->f, dp->arg);
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FIB_MOD_LOCK();
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old_fdh = get_fib_dp_header(*pdp);
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new_fdh = alloc_fib_dp_array(old_fdh->fdh_num_tables, false);
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FD_PRINTF(LOG_DEBUG, fd, "OLD FDH: %p NEW FDH: %p", old_fdh, new_fdh);
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if (new_fdh == NULL) {
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FIB_MOD_UNLOCK();
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FD_PRINTF(LOG_WARNING, fd, "error attaching datapath");
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return (FLM_REBUILD);
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return (false);
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}
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memcpy(&new_fdh->fdh_idx[0], &old_fdh->fdh_idx[0],
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old_fdh->fdh_num_tables * sizeof(struct fib_dp));
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/* Update relevant data structure for @fd */
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new_fdh->fdh_idx[fd->fd_fibnum] = fd->fd_dp;
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new_fdh->fdh_idx[fd->fd_fibnum] = *dp;
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/* Ensure memcpy() writes have completed */
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atomic_thread_fence_rel();
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@ -1580,10 +1581,9 @@ replace_rtables_family(struct fib_dp **pdp, struct fib_data *fd)
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FIB_MOD_UNLOCK();
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FD_PRINTF(LOG_DEBUG, fd, "update %p -> %p", old_fdh, new_fdh);
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epoch_call(net_epoch_preempt, destroy_fdh_epoch,
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&old_fdh->fdh_epoch_ctx);
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fib_epoch_call(destroy_fdh_epoch, &old_fdh->fdh_epoch_ctx);
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return (FLM_SUCCESS);
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return (true);
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}
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static struct fib_dp **
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@ -1601,13 +1601,13 @@ get_family_dp_ptr(int family)
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/*
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* Make datapath use fib instance @fd
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*/
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static enum flm_op_result
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attach_datapath(struct fib_data *fd)
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bool
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fib_set_datapath_ptr(struct fib_data *fd, struct fib_dp *dp)
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{
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struct fib_dp **pdp;
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pdp = get_family_dp_ptr(fd->fd_family);
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return (replace_rtables_family(pdp, fd));
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return (replace_rtables_family(pdp, fd, dp));
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}
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/*
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@ -1635,8 +1635,7 @@ grow_rtables_family(struct fib_dp **pdp, uint32_t new_num_tables)
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FIB_MOD_UNLOCK();
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if (old_fdh != NULL)
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epoch_call(net_epoch_preempt, destroy_fdh_epoch,
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&old_fdh->fdh_epoch_ctx);
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fib_epoch_call(destroy_fdh_epoch, &old_fdh->fdh_epoch_ctx);
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}
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/*
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@ -1667,6 +1666,26 @@ fib_get_rtable_info(struct rib_head *rh, struct rib_rtable_info *rinfo)
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#endif
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}
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/*
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* Updates pointer to the algo data for the @fd.
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*/
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void
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fib_set_algo_ptr(struct fib_data *fd, void *algo_data)
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{
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RIB_WLOCK_ASSERT(fd->fd_rh);
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fd->fd_algo_data = algo_data;
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}
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/*
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* Calls @callback with @ctx after the end of a current epoch.
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*/
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void
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fib_epoch_call(epoch_callback_t callback, epoch_context_t ctx)
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{
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epoch_call(net_epoch_preempt, callback, ctx);
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}
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/*
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* Accessor to get rib instance @fd is attached to.
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*/
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@ -1765,7 +1784,7 @@ fib_schedule_release_nhop(struct fib_data *fd, struct nhop_object *nh)
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nrd = malloc(sizeof(struct nhop_release_data), M_TEMP, M_NOWAIT | M_ZERO);
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if (nrd != NULL) {
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nrd->nh = nh;
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epoch_call(net_epoch_preempt, release_nhop_epoch, &nrd->ctx);
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fib_epoch_call(release_nhop_epoch, &nrd->ctx);
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} else {
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/*
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* Unable to allocate memory. Leak nexthop to maintain guarantee
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@ -128,5 +128,7 @@ uint32_t fib_get_nhop_idx(struct fib_data *fd, struct nhop_object *nh);
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struct nhop_object **fib_get_nhop_array(struct fib_data *fd);
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void fib_get_rtable_info(struct rib_head *rh, struct rib_rtable_info *rinfo);
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struct rib_head *fib_get_rh(struct fib_data *fd);
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bool fib_set_datapath_ptr(struct fib_data *fd, struct fib_dp *dp);
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void fib_set_algo_ptr(struct fib_data *fd, void *algo_data);
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void fib_epoch_call(epoch_callback_t callback, epoch_context_t ctx);
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