From 8ab0805f115b660b81c84cab6dc76ff6117e9734 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 22 May 2018 11:10:03 +0200 Subject: nvmet: split log page implementation Remove the common code to allocate a buffer and copy it into the SGL. Instead the two no-op implementations just zero the SGL directly, and the smart log allocates a buffer on its own. This prepares for the more elaborate ANA log page. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Reviewed-by: Johannes Thumshirn --- drivers/nvme/target/admin-cmd.c | 99 +++++++++++++++-------------------------- 1 file changed, 36 insertions(+), 63 deletions(-) (limited to 'drivers/nvme') diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index b2ba95b2eef7f..e96bb02c4f2c3 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -32,6 +32,11 @@ u32 nvmet_get_log_page_len(struct nvme_command *cmd) return len; } +static void nvmet_execute_get_log_page_noop(struct nvmet_req *req) +{ + nvmet_req_complete(req, nvmet_zero_sgl(req, 0, req->data_len)); +} + static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, struct nvme_smart_log *slog) { @@ -97,74 +102,26 @@ static u16 nvmet_get_smart_log_all(struct nvmet_req *req, return NVME_SC_SUCCESS; } -static u16 nvmet_get_smart_log(struct nvmet_req *req, - struct nvme_smart_log *slog) -{ - u16 status; - - WARN_ON(req == NULL || slog == NULL); - if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL)) - status = nvmet_get_smart_log_all(req, slog); - else - status = nvmet_get_smart_log_nsid(req, slog); - return status; -} - -static void nvmet_execute_get_log_page(struct nvmet_req *req) +static void nvmet_execute_get_log_page_smart(struct nvmet_req *req) { - struct nvme_smart_log *smart_log; - size_t data_len = nvmet_get_log_page_len(req->cmd); - void *buf; - u16 status = 0; + struct nvme_smart_log *log; + u16 status = NVME_SC_INTERNAL; - buf = kzalloc(data_len, GFP_KERNEL); - if (!buf) { - status = NVME_SC_INTERNAL; + if (req->data_len != sizeof(*log)) goto out; - } - switch (req->cmd->get_log_page.lid) { - case NVME_LOG_ERROR: - /* - * We currently never set the More bit in the status field, - * so all error log entries are invalid and can be zeroed out. - * This is called a minum viable implementation (TM) of this - * mandatory log page. - */ - break; - case NVME_LOG_SMART: - /* - * XXX: fill out actual smart log - * - * We might have a hard time coming up with useful values for - * many of the fields, and even when we have useful data - * available (e.g. units or commands read/written) those aren't - * persistent over power loss. - */ - if (data_len != sizeof(*smart_log)) { - status = NVME_SC_INTERNAL; - goto err; - } - smart_log = buf; - status = nvmet_get_smart_log(req, smart_log); - if (status) - goto err; - break; - case NVME_LOG_FW_SLOT: - /* - * We only support a single firmware slot which always is - * active, so we can zero out the whole firmware slot log and - * still claim to fully implement this mandatory log page. - */ - break; - default: - BUG(); - } + log = kzalloc(sizeof(*log), GFP_KERNEL); + if (!log) + goto out; - status = nvmet_copy_to_sgl(req, 0, buf, data_len); + if (req->cmd->get_log_page.nsid == cpu_to_le32(NVME_NSID_ALL)) + status = nvmet_get_smart_log_all(req, log); + else + status = nvmet_get_smart_log_nsid(req, log); + if (status) + goto out; -err: - kfree(buf); + status = nvmet_copy_to_sgl(req, 0, log, sizeof(*log)); out: nvmet_req_complete(req, status); } @@ -566,9 +523,25 @@ u16 nvmet_parse_admin_cmd(struct nvmet_req *req) switch (cmd->get_log_page.lid) { case NVME_LOG_ERROR: + /* + * We currently never set the More bit in the status + * field, so all error log entries are invalid and can + * be zeroed out. This is called a minum viable + * implementation (TM) of this mandatory log page. + */ + req->execute = nvmet_execute_get_log_page_noop; + return 0; case NVME_LOG_SMART: + req->execute = nvmet_execute_get_log_page_smart; + return 0; case NVME_LOG_FW_SLOT: - req->execute = nvmet_execute_get_log_page; + /* + * We only support a single firmware slot which always + * is active, so we can zero out the whole firmware slot + * log and still claim to fully implement this mandatory + * log page. + */ + req->execute = nvmet_execute_get_log_page_noop; return 0; } break; -- cgit v1.2.3