diff options
Diffstat (limited to 'drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c')
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c | 763 |
1 files changed, 763 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c new file mode 100644 index 000000000000..acef61abe35d --- /dev/null +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c @@ -0,0 +1,763 @@ +/* Broadcom NetXtreme-C/E network driver. + * + * Copyright (c) 2020 Broadcom Limited + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation. + */ + +#include <asm/byteorder.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/errno.h> +#include <linux/ethtool.h> +#include <linux/if_ether.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/pci.h> +#include <linux/skbuff.h> + +#include "bnxt_hsi.h" +#include "bnxt.h" +#include "bnxt_hwrm.h" + +static u64 hwrm_calc_sentinel(struct bnxt_hwrm_ctx *ctx, u16 req_type) +{ + return (((uintptr_t)ctx) + req_type) ^ BNXT_HWRM_SENTINEL; +} + +/** + * __hwrm_req_init() - Initialize an HWRM request. + * @bp: The driver context. + * @req: A pointer to the request pointer to initialize. + * @req_type: The request type. This will be converted to the little endian + * before being written to the req_type field of the returned request. + * @req_len: The length of the request to be allocated. + * + * Allocate DMA resources and initialize a new HWRM request object of the + * given type. The response address field in the request is configured with + * the DMA bus address that has been mapped for the response and the passed + * request is pointed to kernel virtual memory mapped for the request (such + * that short_input indirection can be accomplished without copying). The + * request’s target and completion ring are initialized to default values and + * can be overridden by writing to the returned request object directly. + * + * The initialized request can be further customized by writing to its fields + * directly, taking care to covert such fields to little endian. The request + * object will be consumed (and all its associated resources release) upon + * passing it to hwrm_req_send() unless ownership of the request has been + * claimed by the caller via a call to hwrm_req_hold(). If the request is not + * consumed, either because it is never sent or because ownership has been + * claimed, then it must be released by a call to hwrm_req_drop(). + * + * Return: zero on success, negative error code otherwise: + * E2BIG: the type of request pointer is too large to fit. + * ENOMEM: an allocation failure occurred. + */ +int __hwrm_req_init(struct bnxt *bp, void **req, u16 req_type, u32 req_len) +{ + struct bnxt_hwrm_ctx *ctx; + dma_addr_t dma_handle; + u8 *req_addr; + + if (req_len > BNXT_HWRM_CTX_OFFSET) + return -E2BIG; + + req_addr = dma_pool_alloc(bp->hwrm_dma_pool, GFP_KERNEL | __GFP_ZERO, + &dma_handle); + if (!req_addr) + return -ENOMEM; + + ctx = (struct bnxt_hwrm_ctx *)(req_addr + BNXT_HWRM_CTX_OFFSET); + /* safety first, sentinel used to check for invalid requests */ + ctx->sentinel = hwrm_calc_sentinel(ctx, req_type); + ctx->req_len = req_len; + ctx->req = (struct input *)req_addr; + ctx->resp = (struct output *)(req_addr + BNXT_HWRM_RESP_OFFSET); + ctx->dma_handle = dma_handle; + ctx->flags = 0; /* __GFP_ZERO, but be explicit regarding ownership */ + ctx->timeout = bp->hwrm_cmd_timeout ?: DFLT_HWRM_CMD_TIMEOUT; + ctx->allocated = BNXT_HWRM_DMA_SIZE - BNXT_HWRM_CTX_OFFSET; + ctx->gfp = GFP_KERNEL; + ctx->slice_addr = NULL; + + /* initialize common request fields */ + ctx->req->req_type = cpu_to_le16(req_type); + ctx->req->resp_addr = cpu_to_le64(dma_handle + BNXT_HWRM_RESP_OFFSET); + ctx->req->cmpl_ring = cpu_to_le16(BNXT_HWRM_NO_CMPL_RING); + ctx->req->target_id = cpu_to_le16(BNXT_HWRM_TARGET); + *req = ctx->req; + + return 0; +} + +static struct bnxt_hwrm_ctx *__hwrm_ctx(struct bnxt *bp, u8 *req_addr) +{ + void *ctx_addr = req_addr + BNXT_HWRM_CTX_OFFSET; + struct input *req = (struct input *)req_addr; + struct bnxt_hwrm_ctx *ctx = ctx_addr; + u64 sentinel; + + if (!req) { + /* can only be due to software bug, be loud */ + netdev_err(bp->dev, "null HWRM request"); + dump_stack(); + return NULL; + } + + /* HWRM API has no type safety, verify sentinel to validate address */ + sentinel = hwrm_calc_sentinel(ctx, le16_to_cpu(req->req_type)); + if (ctx->sentinel != sentinel) { + /* can only be due to software bug, be loud */ + netdev_err(bp->dev, "HWRM sentinel mismatch, req_type = %u\n", + (u32)le16_to_cpu(req->req_type)); + dump_stack(); + return NULL; + } + + return ctx; +} + +/** + * hwrm_req_timeout() - Set the completion timeout for the request. + * @bp: The driver context. + * @req: The request to set the timeout. + * @timeout: The timeout in milliseconds. + * + * Set the timeout associated with the request for subsequent calls to + * hwrm_req_send(). Some requests are long running and require a different + * timeout than the default. + */ +void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int timeout) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + + if (ctx) + ctx->timeout = timeout; +} + +/** + * hwrm_req_alloc_flags() - Sets GFP allocation flags for slices. + * @bp: The driver context. + * @req: The request for which calls to hwrm_req_dma_slice() will have altered + * allocation flags. + * @flags: A bitmask of GFP flags. These flags are passed to + * dma_alloc_coherent() whenever it is used to allocate backing memory + * for slices. Note that calls to hwrm_req_dma_slice() will not always + * result in new allocations, however, memory suballocated from the + * request buffer is already __GFP_ZERO. + * + * Sets the GFP allocation flags associated with the request for subsequent + * calls to hwrm_req_dma_slice(). This can be useful for specifying __GFP_ZERO + * for slice allocations. + */ +void hwrm_req_alloc_flags(struct bnxt *bp, void *req, gfp_t gfp) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + + if (ctx) + ctx->gfp = gfp; +} + +/** + * hwrm_req_replace() - Replace request data. + * @bp: The driver context. + * @req: The request to modify. A call to hwrm_req_replace() is conceptually + * an assignment of new_req to req. Subsequent calls to HWRM API functions, + * such as hwrm_req_send(), should thus use req and not new_req (in fact, + * calls to HWRM API functions will fail if non-managed request objects + * are passed). + * @len: The length of new_req. + * @new_req: The pre-built request to copy or reference. + * + * Replaces the request data in req with that of new_req. This is useful in + * scenarios where a request object has already been constructed by a third + * party prior to creating a resource managed request using hwrm_req_init(). + * Depending on the length, hwrm_req_replace() will either copy the new + * request data into the DMA memory allocated for req, or it will simply + * reference the new request and use it in lieu of req during subsequent + * calls to hwrm_req_send(). The resource management is associated with + * req and is independent of and does not apply to new_req. The caller must + * ensure that the lifetime of new_req is least as long as req. Any slices + * that may have been associated with the original request are released. + * + * Return: zero on success, negative error code otherwise: + * E2BIG: Request is too large. + * EINVAL: Invalid request to modify. + */ +int hwrm_req_replace(struct bnxt *bp, void *req, void *new_req, u32 len) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + struct input *internal_req = req; + u16 req_type; + + if (!ctx) + return -EINVAL; + + if (len > BNXT_HWRM_CTX_OFFSET) + return -E2BIG; + + /* free any existing slices */ + ctx->allocated = BNXT_HWRM_DMA_SIZE - BNXT_HWRM_CTX_OFFSET; + if (ctx->slice_addr) { + dma_free_coherent(&bp->pdev->dev, ctx->slice_size, + ctx->slice_addr, ctx->slice_handle); + ctx->slice_addr = NULL; + } + ctx->gfp = GFP_KERNEL; + + if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) || len > BNXT_HWRM_MAX_REQ_LEN) { + memcpy(internal_req, new_req, len); + } else { + internal_req->req_type = ((struct input *)new_req)->req_type; + ctx->req = new_req; + } + + ctx->req_len = len; + ctx->req->resp_addr = cpu_to_le64(ctx->dma_handle + + BNXT_HWRM_RESP_OFFSET); + + /* update sentinel for potentially new request type */ + req_type = le16_to_cpu(internal_req->req_type); + ctx->sentinel = hwrm_calc_sentinel(ctx, req_type); + + return 0; +} + +/** + * hwrm_req_flags() - Set non internal flags of the ctx + * @bp: The driver context. + * @req: The request containing the HWRM command + * @flags: ctx flags that don't have BNXT_HWRM_INTERNAL_FLAG set + * + * ctx flags can be used by the callers to instruct how the subsequent + * hwrm_req_send() should behave. Example: callers can use hwrm_req_flags + * with BNXT_HWRM_CTX_SILENT to omit kernel prints of errors of hwrm_req_send() + * or with BNXT_HWRM_FULL_WAIT enforce hwrm_req_send() to wait for full timeout + * even if FW is not responding. + * This generic function can be used to set any flag that is not an internal flag + * of the HWRM module. + */ +void hwrm_req_flags(struct bnxt *bp, void *req, enum bnxt_hwrm_ctx_flags flags) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + + if (ctx) + ctx->flags |= (flags & HWRM_API_FLAGS); +} + +/** + * hwrm_req_hold() - Claim ownership of the request's resources. + * @bp: The driver context. + * @req: A pointer to the request to own. The request will no longer be + * consumed by calls to hwrm_req_send(). + * + * Take ownership of the request. Ownership places responsibility on the + * caller to free the resources associated with the request via a call to + * hwrm_req_drop(). The caller taking ownership implies that a subsequent + * call to hwrm_req_send() will not consume the request (ie. sending will + * not free the associated resources if the request is owned by the caller). + * Taking ownership returns a reference to the response. Retaining and + * accessing the response data is the most common reason to take ownership + * of the request. Ownership can also be acquired in order to reuse the same + * request object across multiple invocations of hwrm_req_send(). + * + * Return: A pointer to the response object. + * + * The resources associated with the response will remain available to the + * caller until ownership of the request is relinquished via a call to + * hwrm_req_drop(). It is not possible for hwrm_req_hold() to return NULL if + * a valid request is provided. A returned NULL value would imply a driver + * bug and the implementation will complain loudly in the logs to aid in + * detection. It should not be necessary to check the result for NULL. + */ +void *hwrm_req_hold(struct bnxt *bp, void *req) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + struct input *input = (struct input *)req; + + if (!ctx) + return NULL; + + if (ctx->flags & BNXT_HWRM_INTERNAL_CTX_OWNED) { + /* can only be due to software bug, be loud */ + netdev_err(bp->dev, "HWRM context already owned, req_type = %u\n", + (u32)le16_to_cpu(input->req_type)); + dump_stack(); + return NULL; + } + + ctx->flags |= BNXT_HWRM_INTERNAL_CTX_OWNED; + return ((u8 *)req) + BNXT_HWRM_RESP_OFFSET; +} + +static void __hwrm_ctx_drop(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx) +{ + void *addr = ((u8 *)ctx) - BNXT_HWRM_CTX_OFFSET; + dma_addr_t dma_handle = ctx->dma_handle; /* save before invalidate */ + + /* unmap any auxiliary DMA slice */ + if (ctx->slice_addr) + dma_free_coherent(&bp->pdev->dev, ctx->slice_size, + ctx->slice_addr, ctx->slice_handle); + + /* invalidate, ensure ownership, sentinel and dma_handle are cleared */ + memset(ctx, 0, sizeof(struct bnxt_hwrm_ctx)); + + /* return the buffer to the DMA pool */ + if (dma_handle) + dma_pool_free(bp->hwrm_dma_pool, addr, dma_handle); +} + +/** + * hwrm_req_drop() - Release all resources associated with the request. + * @bp: The driver context. + * @req: The request to consume, releasing the associated resources. The + * request object, any slices, and its associated response are no + * longer valid. + * + * It is legal to call hwrm_req_drop() on an unowned request, provided it + * has not already been consumed by hwrm_req_send() (for example, to release + * an aborted request). A given request should not be dropped more than once, + * nor should it be dropped after having been consumed by hwrm_req_send(). To + * do so is an error (the context will not be found and a stack trace will be + * rendered in the kernel log). + */ +void hwrm_req_drop(struct bnxt *bp, void *req) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + + if (ctx) + __hwrm_ctx_drop(bp, ctx); +} + +static int __hwrm_to_stderr(u32 hwrm_err) +{ + switch (hwrm_err) { + case HWRM_ERR_CODE_SUCCESS: + return 0; + case HWRM_ERR_CODE_RESOURCE_LOCKED: + return -EROFS; + case HWRM_ERR_CODE_RESOURCE_ACCESS_DENIED: + return -EACCES; + case HWRM_ERR_CODE_RESOURCE_ALLOC_ERROR: + return -ENOSPC; + case HWRM_ERR_CODE_INVALID_PARAMS: + case HWRM_ERR_CODE_INVALID_FLAGS: + case HWRM_ERR_CODE_INVALID_ENABLES: + case HWRM_ERR_CODE_UNSUPPORTED_TLV: + case HWRM_ERR_CODE_UNSUPPORTED_OPTION_ERR: + return -EINVAL; + case HWRM_ERR_CODE_NO_BUFFER: + return -ENOMEM; + case HWRM_ERR_CODE_HOT_RESET_PROGRESS: + case HWRM_ERR_CODE_BUSY: + return -EAGAIN; + case HWRM_ERR_CODE_CMD_NOT_SUPPORTED: + return -EOPNOTSUPP; + default: + return -EIO; + } +} + +static struct bnxt_hwrm_wait_token * +__hwrm_acquire_token(struct bnxt *bp, enum bnxt_hwrm_chnl dst) +{ + struct bnxt_hwrm_wait_token *token; + + token = kzalloc(sizeof(*token), GFP_KERNEL); + if (!token) + return NULL; + + mutex_lock(&bp->hwrm_cmd_lock); + + token->dst = dst; + token->state = BNXT_HWRM_PENDING; + if (dst == BNXT_HWRM_CHNL_CHIMP) { + token->seq_id = bp->hwrm_cmd_seq++; + hlist_add_head_rcu(&token->node, &bp->hwrm_pending_list); + } else { + token->seq_id = bp->hwrm_cmd_kong_seq++; + } + + return token; +} + +static void +__hwrm_release_token(struct bnxt *bp, struct bnxt_hwrm_wait_token *token) +{ + if (token->dst == BNXT_HWRM_CHNL_CHIMP) { + hlist_del_rcu(&token->node); + kfree_rcu(token, rcu); + } else { + kfree(token); + } + mutex_unlock(&bp->hwrm_cmd_lock); +} + +void +hwrm_update_token(struct bnxt *bp, u16 seq_id, enum bnxt_hwrm_wait_state state) +{ + struct bnxt_hwrm_wait_token *token; + + rcu_read_lock(); + hlist_for_each_entry_rcu(token, &bp->hwrm_pending_list, node) { + if (token->seq_id == seq_id) { + WRITE_ONCE(token->state, state); + rcu_read_unlock(); + return; + } + } + rcu_read_unlock(); + netdev_err(bp->dev, "Invalid hwrm seq id %d\n", seq_id); +} + +static int __hwrm_send(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx) +{ + u32 doorbell_offset = BNXT_GRCPF_REG_CHIMP_COMM_TRIGGER; + enum bnxt_hwrm_chnl dst = BNXT_HWRM_CHNL_CHIMP; + u32 bar_offset = BNXT_GRCPF_REG_CHIMP_COMM; + struct bnxt_hwrm_wait_token *token = NULL; + struct hwrm_short_input short_input = {0}; + u16 max_req_len = BNXT_HWRM_MAX_REQ_LEN; + unsigned int i, timeout, tmo_count; + u32 *data = (u32 *)ctx->req; + u32 msg_len = ctx->req_len; + int rc = -EBUSY; + u32 req_type; + u16 len = 0; + u8 *valid; + + if (ctx->flags & BNXT_HWRM_INTERNAL_RESP_DIRTY) + memset(ctx->resp, 0, PAGE_SIZE); + + req_type = le16_to_cpu(ctx->req->req_type); + if (BNXT_NO_FW_ACCESS(bp) && req_type != HWRM_FUNC_RESET) + goto exit; + + if (msg_len > BNXT_HWRM_MAX_REQ_LEN && + msg_len > bp->hwrm_max_ext_req_len) { + rc = -E2BIG; + goto exit; + } + + if (bnxt_kong_hwrm_message(bp, ctx->req)) { + dst = BNXT_HWRM_CHNL_KONG; + bar_offset = BNXT_GRCPF_REG_KONG_COMM; + doorbell_offset = BNXT_GRCPF_REG_KONG_COMM_TRIGGER; + if (le16_to_cpu(ctx->req->cmpl_ring) != INVALID_HW_RING_ID) { + netdev_err(bp->dev, "Ring completions not supported for KONG commands, req_type = %d\n", + req_type); + rc = -EINVAL; + goto exit; + } + } + + token = __hwrm_acquire_token(bp, dst); + if (!token) { + rc = -ENOMEM; + goto exit; + } + ctx->req->seq_id = cpu_to_le16(token->seq_id); + + if ((bp->fw_cap & BNXT_FW_CAP_SHORT_CMD) || + msg_len > BNXT_HWRM_MAX_REQ_LEN) { + short_input.req_type = ctx->req->req_type; + short_input.signature = + cpu_to_le16(SHORT_REQ_SIGNATURE_SHORT_CMD); + short_input.size = cpu_to_le16(msg_len); + short_input.req_addr = cpu_to_le64(ctx->dma_handle); + + data = (u32 *)&short_input; + msg_len = sizeof(short_input); + + max_req_len = BNXT_HWRM_SHORT_REQ_LEN; + } + + /* Ensure any associated DMA buffers are written before doorbell */ + wmb(); + + /* Write request msg to hwrm channel */ + __iowrite32_copy(bp->bar0 + bar_offset, data, msg_len / 4); + + for (i = msg_len; i < max_req_len; i += 4) + writel(0, bp->bar0 + bar_offset + i); + + /* Ring channel doorbell */ + writel(1, bp->bar0 + doorbell_offset); + + if (!pci_is_enabled(bp->pdev)) { + rc = -ENODEV; + goto exit; + } + + /* Limit timeout to an upper limit */ + timeout = min_t(uint, ctx->timeout, HWRM_CMD_MAX_TIMEOUT); + /* convert timeout to usec */ + timeout *= 1000; + + i = 0; + /* Short timeout for the first few iterations: + * number of loops = number of loops for short timeout + + * number of loops for standard timeout. + */ + tmo_count = HWRM_SHORT_TIMEOUT_COUNTER; + timeout = timeout - HWRM_SHORT_MIN_TIMEOUT * HWRM_SHORT_TIMEOUT_COUNTER; + tmo_count += DIV_ROUND_UP(timeout, HWRM_MIN_TIMEOUT); + + if (le16_to_cpu(ctx->req->cmpl_ring) != INVALID_HW_RING_ID) { + /* Wait until hwrm response cmpl interrupt is processed */ + while (READ_ONCE(token->state) < BNXT_HWRM_COMPLETE && + i++ < tmo_count) { + /* Abort the wait for completion if the FW health + * check has failed. + */ + if (test_bit(BNXT_STATE_FW_FATAL_COND, &bp->state)) + goto exit; + /* on first few passes, just barely sleep */ + if (i < HWRM_SHORT_TIMEOUT_COUNTER) { + usleep_range(HWRM_SHORT_MIN_TIMEOUT, + HWRM_SHORT_MAX_TIMEOUT); + } else { + if (HWRM_WAIT_MUST_ABORT(bp, ctx)) + break; + usleep_range(HWRM_MIN_TIMEOUT, + HWRM_MAX_TIMEOUT); + } + } + + if (READ_ONCE(token->state) != BNXT_HWRM_COMPLETE) { + if (!(ctx->flags & BNXT_HWRM_CTX_SILENT)) + netdev_err(bp->dev, "Resp cmpl intr err msg: 0x%x\n", + le16_to_cpu(ctx->req->req_type)); + goto exit; + } + len = le16_to_cpu(READ_ONCE(ctx->resp->resp_len)); + valid = ((u8 *)ctx->resp) + len - 1; + } else { + __le16 seen_out_of_seq = ctx->req->seq_id; /* will never see */ + int j; + + /* Check if response len is updated */ + for (i = 0; i < tmo_count; i++) { + /* Abort the wait for completion if the FW health + * check has failed. + */ + if (test_bit(BNXT_STATE_FW_FATAL_COND, &bp->state)) + goto exit; + + if (token && + READ_ONCE(token->state) == BNXT_HWRM_DEFERRED) { + __hwrm_release_token(bp, token); + token = NULL; + } + + len = le16_to_cpu(READ_ONCE(ctx->resp->resp_len)); + if (len) { + __le16 resp_seq = READ_ONCE(ctx->resp->seq_id); + + if (resp_seq == ctx->req->seq_id) + break; + if (resp_seq != seen_out_of_seq) { + netdev_warn(bp->dev, "Discarding out of seq response: 0x%x for msg {0x%x 0x%x}\n", + le16_to_cpu(resp_seq), + le16_to_cpu(ctx->req->req_type), + le16_to_cpu(ctx->req->seq_id)); + seen_out_of_seq = resp_seq; + } + } + + /* on first few passes, just barely sleep */ + if (i < HWRM_SHORT_TIMEOUT_COUNTER) { + usleep_range(HWRM_SHORT_MIN_TIMEOUT, + HWRM_SHORT_MAX_TIMEOUT); + } else { + if (HWRM_WAIT_MUST_ABORT(bp, ctx)) + goto timeout_abort; + usleep_range(HWRM_MIN_TIMEOUT, + HWRM_MAX_TIMEOUT); + } + } + + if (i >= tmo_count) { +timeout_abort: + if (!(ctx->flags & BNXT_HWRM_CTX_SILENT)) + netdev_err(bp->dev, "Error (timeout: %u) msg {0x%x 0x%x} len:%d\n", + hwrm_total_timeout(i), + le16_to_cpu(ctx->req->req_type), + le16_to_cpu(ctx->req->seq_id), len); + goto exit; + } + + /* Last byte of resp contains valid bit */ + valid = ((u8 *)ctx->resp) + len - 1; + for (j = 0; j < HWRM_VALID_BIT_DELAY_USEC; j++) { + /* make sure we read from updated DMA memory */ + dma_rmb(); + if (*valid) + break; + usleep_range(1, 5); + } + + if (j >= HWRM_VALID_BIT_DELAY_USEC) { + if (!(ctx->flags & BNXT_HWRM_CTX_SILENT)) + netdev_err(bp->dev, "Error (timeout: %u) msg {0x%x 0x%x} len:%d v:%d\n", + hwrm_total_timeout(i), + le16_to_cpu(ctx->req->req_type), + le16_to_cpu(ctx->req->seq_id), len, + *valid); + goto exit; + } + } + + /* Zero valid bit for compatibility. Valid bit in an older spec + * may become a new field in a newer spec. We must make sure that + * a new field not implemented by old spec will read zero. + */ + *valid = 0; + rc = le16_to_cpu(ctx->resp->error_code); + if (rc && !(ctx->flags & BNXT_HWRM_CTX_SILENT)) { + netdev_err(bp->dev, "hwrm req_type 0x%x seq id 0x%x error 0x%x\n", + le16_to_cpu(ctx->resp->req_type), + le16_to_cpu(ctx->resp->seq_id), rc); + } + rc = __hwrm_to_stderr(rc); +exit: + if (token) + __hwrm_release_token(bp, token); + if (ctx->flags & BNXT_HWRM_INTERNAL_CTX_OWNED) + ctx->flags |= BNXT_HWRM_INTERNAL_RESP_DIRTY; + else + __hwrm_ctx_drop(bp, ctx); + return rc; +} + +/** + * hwrm_req_send() - Execute an HWRM command. + * @bp: The driver context. + * @req: A pointer to the request to send. The DMA resources associated with + * the request will be released (ie. the request will be consumed) unless + * ownership of the request has been assumed by the caller via a call to + * hwrm_req_hold(). + * + * Send an HWRM request to the device and wait for a response. The request is + * consumed if it is not owned by the caller. This function will block until + * the request has either completed or times out due to an error. + * + * Return: A result code. + * + * The result is zero on success, otherwise the negative error code indicates + * one of the following errors: + * E2BIG: The request was too large. + * EBUSY: The firmware is in a fatal state or the request timed out + * EACCESS: HWRM access denied. + * ENOSPC: HWRM resource allocation error. + * EINVAL: Request parameters are invalid. + * ENOMEM: HWRM has no buffers. + * EAGAIN: HWRM busy or reset in progress. + * EOPNOTSUPP: Invalid request type. + * EIO: Any other error. + * Error handling is orthogonal to request ownership. An unowned request will + * still be consumed on error. If the caller owns the request, then the caller + * is responsible for releasing the resources. Otherwise, hwrm_req_send() will + * always consume the request. + */ +int hwrm_req_send(struct bnxt *bp, void *req) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + + if (!ctx) + return -EINVAL; + + return __hwrm_send(bp, ctx); +} + +/** + * hwrm_req_send_silent() - A silent version of hwrm_req_send(). + * @bp: The driver context. + * @req: The request to send without logging. + * + * The same as hwrm_req_send(), except that the request is silenced using + * hwrm_req_silence() prior the call. This version of the function is + * provided solely to preserve the legacy API’s flavor for this functionality. + * + * Return: A result code, see hwrm_req_send(). + */ +int hwrm_req_send_silent(struct bnxt *bp, void *req) +{ + hwrm_req_flags(bp, req, BNXT_HWRM_CTX_SILENT); + return hwrm_req_send(bp, req); +} + +/** + * hwrm_req_dma_slice() - Allocate a slice of DMA mapped memory. + * @bp: The driver context. + * @req: The request for which indirect data will be associated. + * @size: The size of the allocation. + * @dma: The bus address associated with the allocation. The HWRM API has no + * knowledge about the type of the request and so cannot infer how the + * caller intends to use the indirect data. Thus, the caller is + * responsible for configuring the request object appropriately to + * point to the associated indirect memory. Note, DMA handle has the + * same definition as it does in dma_alloc_coherent(), the caller is + * responsible for endian conversions via cpu_to_le64() before assigning + * this address. + * + * Allocates DMA mapped memory for indirect data related to a request. The + * lifetime of the DMA resources will be bound to that of the request (ie. + * they will be automatically released when the request is either consumed by + * hwrm_req_send() or dropped by hwrm_req_drop()). Small allocations are + * efficiently suballocated out of the request buffer space, hence the name + * slice, while larger requests are satisfied via an underlying call to + * dma_alloc_coherent(). Multiple suballocations are supported, however, only + * one externally mapped region is. + * + * Return: The kernel virtual address of the DMA mapping. + */ +void * +hwrm_req_dma_slice(struct bnxt *bp, void *req, u32 size, dma_addr_t *dma_handle) +{ + struct bnxt_hwrm_ctx *ctx = __hwrm_ctx(bp, req); + u8 *end = ((u8 *)req) + BNXT_HWRM_DMA_SIZE; + struct input *input = req; + u8 *addr, *req_addr = req; + u32 max_offset, offset; + + if (!ctx) + return NULL; + + max_offset = BNXT_HWRM_DMA_SIZE - ctx->allocated; + offset = max_offset - size; + offset = ALIGN_DOWN(offset, BNXT_HWRM_DMA_ALIGN); + addr = req_addr + offset; + + if (addr < req_addr + max_offset && req_addr + ctx->req_len <= addr) { + ctx->allocated = end - addr; + *dma_handle = ctx->dma_handle + offset; + return addr; + } + + /* could not suballocate from ctx buffer, try create a new mapping */ + if (ctx->slice_addr) { + /* if one exists, can only be due to software bug, be loud */ + netdev_err(bp->dev, "HWRM refusing to reallocate DMA slice, req_type = %u\n", + (u32)le16_to_cpu(input->req_type)); + dump_stack(); + return NULL; + } + + addr = dma_alloc_coherent(&bp->pdev->dev, size, dma_handle, ctx->gfp); + + if (!addr) + return NULL; + + ctx->slice_addr = addr; + ctx->slice_size = size; + ctx->slice_handle = *dma_handle; + + return addr; +} |