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Date: Wed, 11 May 2022 12:36:04 +0200 From: Íñigo Huguet <ihuguet@...hat.com> To: ecree.xilinx@...il.com, habetsm.xilinx@...il.com, bhutchings@...arflare.com Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org, Íñigo Huguet <ihuguet@...hat.com> Subject: [PATCH net-next 2/2] sfc: simplify mtd partitions list handling efx_mtd_partitions are embedded inside efx_mcdi_mtd_partition structs. They contain a list entry that is appended to efx->mtd_list, which is traversed to perform add/remove/rename/etc operations over all efx_mtd_partitions. However, almost all operations done on a efx_mtd_partition asume that it is actually embedded inside an efx_mcdi_mtd_partition, and the deallocation asume that the first member of the list is located at the beginning of the allocated memory. Given all that asumptions, the possibility of having an efx_mtd_partition not embedded in an efx_mcdi_efx_partition doesn't exist. Neither it does the possibility of being in a memory position other the one allocated for the efx_mcdi_mtd_partition array. Also, they never need to be reordered. Given all that, it is better to get rid of the list and use directly the efx_mcdi_mtd_partition array. This shows more clearly how they lay in memory, list traversal is more obvious and it save a small amount of memory on the list nodes. Signed-off-by: Íñigo Huguet <ihuguet@...hat.com> --- drivers/net/ethernet/sfc/ef10.c | 12 ++++++-- drivers/net/ethernet/sfc/efx.h | 4 +-- drivers/net/ethernet/sfc/efx_common.c | 3 -- drivers/net/ethernet/sfc/mtd.c | 42 ++++++++++----------------- drivers/net/ethernet/sfc/net_driver.h | 9 ++++-- 5 files changed, 33 insertions(+), 37 deletions(-) diff --git a/drivers/net/ethernet/sfc/ef10.c b/drivers/net/ethernet/sfc/ef10.c index 15a229731296..b5284fa529b7 100644 --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -3584,10 +3584,16 @@ static int efx_ef10_mtd_probe(struct efx_nic *efx) return 0; } - rc = efx_mtd_add(efx, &parts[0].common, n_parts, sizeof(*parts)); -fail: + rc = efx_mtd_add(efx, parts, n_parts); if (rc) - kfree(parts); + goto fail; + efx->mcdi_mtd_parts = parts; + efx->n_mcdi_mtd_parts = n_parts; + + return 0; + +fail: + kfree(parts); return rc; } diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h index c05a83da9e44..2ab9ba691b0d 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -181,8 +181,8 @@ void efx_update_sw_stats(struct efx_nic *efx, u64 *stats); /* MTD */ #ifdef CONFIG_SFC_MTD -int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts, - size_t n_parts, size_t sizeof_part); +int efx_mtd_add(struct efx_nic *efx, struct efx_mcdi_mtd_partition *parts, + size_t n_parts); static inline int efx_mtd_probe(struct efx_nic *efx) { return efx->type->mtd_probe(efx); diff --git a/drivers/net/ethernet/sfc/efx_common.c b/drivers/net/ethernet/sfc/efx_common.c index f6577e74d6e6..8802790403e9 100644 --- a/drivers/net/ethernet/sfc/efx_common.c +++ b/drivers/net/ethernet/sfc/efx_common.c @@ -987,9 +987,6 @@ int efx_init_struct(struct efx_nic *efx, INIT_LIST_HEAD(&efx->node); INIT_LIST_HEAD(&efx->secondary_list); spin_lock_init(&efx->biu_lock); -#ifdef CONFIG_SFC_MTD - INIT_LIST_HEAD(&efx->mtd_list); -#endif INIT_WORK(&efx->reset_work, efx_reset_work); INIT_DELAYED_WORK(&efx->monitor_work, efx_monitor); efx_selftest_async_init(efx); diff --git a/drivers/net/ethernet/sfc/mtd.c b/drivers/net/ethernet/sfc/mtd.c index 273c08e5455f..4d06e8a9a729 100644 --- a/drivers/net/ethernet/sfc/mtd.c +++ b/drivers/net/ethernet/sfc/mtd.c @@ -12,6 +12,7 @@ #include "net_driver.h" #include "efx.h" +#include "mcdi.h" #define to_efx_mtd_partition(mtd) \ container_of(mtd, struct efx_mtd_partition, mtd) @@ -48,18 +49,16 @@ static void efx_mtd_remove_partition(struct efx_mtd_partition *part) ssleep(1); } WARN_ON(rc); - list_del(&part->node); } -int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts, - size_t n_parts, size_t sizeof_part) +int efx_mtd_add(struct efx_nic *efx, struct efx_mcdi_mtd_partition *parts, + size_t n_parts) { struct efx_mtd_partition *part; size_t i; for (i = 0; i < n_parts; i++) { - part = (struct efx_mtd_partition *)((char *)parts + - i * sizeof_part); + part = &parts[i].common; part->mtd.writesize = 1; @@ -78,47 +77,38 @@ int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts, if (mtd_device_register(&part->mtd, NULL, 0)) goto fail; - - /* Add to list in order - efx_mtd_remove() depends on this */ - list_add_tail(&part->node, &efx->mtd_list); } return 0; fail: - while (i--) { - part = (struct efx_mtd_partition *)((char *)parts + - i * sizeof_part); - efx_mtd_remove_partition(part); - } + while (i--) + efx_mtd_remove_partition(&parts[i].common); + /* Failure is unlikely here, but probably means we're out of memory */ return -ENOMEM; } void efx_mtd_remove(struct efx_nic *efx) { - struct efx_mtd_partition *parts, *part, *next; + int i; WARN_ON(efx_dev_registered(efx)); - if (list_empty(&efx->mtd_list)) - return; - - parts = list_first_entry(&efx->mtd_list, struct efx_mtd_partition, - node); + for (i = 0; i < efx->n_mcdi_mtd_parts; i++) + efx_mtd_remove_partition(&efx->mcdi_mtd_parts[i].common); - list_for_each_entry_safe(part, next, &efx->mtd_list, node) - efx_mtd_remove_partition(part); - - kfree(parts); + kfree(efx->mcdi_mtd_parts); + efx->mcdi_mtd_parts = NULL; + efx->n_mcdi_mtd_parts = 0; } void efx_mtd_rename(struct efx_nic *efx) { - struct efx_mtd_partition *part; + int i; ASSERT_RTNL(); - list_for_each_entry(part, &efx->mtd_list, node) - efx->type->mtd_rename(part); + for (i = 0; i < efx->n_mcdi_mtd_parts; i++) + efx->type->mtd_rename(&efx->mcdi_mtd_parts[i].common); } diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 318db906a154..5d20b25b0e82 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -107,6 +107,8 @@ struct hwtstamp_config; struct efx_self_tests; +struct efx_mcdi_mtd_partition; + /** * struct efx_buffer - A general-purpose DMA buffer * @addr: host base address of the buffer @@ -865,7 +867,8 @@ enum efx_xdp_tx_queues_mode { * @irq_zero_count: Number of legacy IRQs seen with queue flags == 0 * @irq_level: IRQ level/index for IRQs not triggered by an event queue * @selftest_work: Work item for asynchronous self-test - * @mtd_list: List of MTDs attached to the NIC + * @mcdi_mtd_parts: Array of MTDs attached to the NIC + * @n_mcdi_mtd_parts: Number of MTDs attached to the NIC * @nic_data: Hardware dependent state * @mcdi: Management-Controller-to-Driver Interface state * @mac_lock: MAC access lock. Protects @port_enabled, @phy_mode, @@ -1033,7 +1036,8 @@ struct efx_nic { struct delayed_work selftest_work; #ifdef CONFIG_SFC_MTD - struct list_head mtd_list; + struct efx_mcdi_mtd_partition *mcdi_mtd_parts; + unsigned int n_mcdi_mtd_parts; #endif void *nic_data; @@ -1134,7 +1138,6 @@ static inline unsigned int efx_port_num(struct efx_nic *efx) } struct efx_mtd_partition { - struct list_head node; struct mtd_info mtd; const char *dev_type_name; const char *type_name; -- 2.34.1
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