diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c | 115 | ||||
| -rw-r--r-- | drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.h | 7 |
2 files changed, 120 insertions, 2 deletions
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c index 39ef65025e17..6609a86d5226 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c @@ -91,6 +91,9 @@ int __hwrm_req_init(struct bnxt *bp, void **req, u16 req_type, u32 req_len) 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); @@ -148,6 +151,29 @@ void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int 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 @@ -166,7 +192,8 @@ void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int timeout) * 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. + * 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. @@ -184,6 +211,15 @@ int hwrm_req_replace(struct bnxt *bp, void *req, void *new_req, u32 len) 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 { @@ -274,6 +310,11 @@ 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)); @@ -286,7 +327,8 @@ static void __hwrm_ctx_drop(struct bnxt *bp, struct bnxt_hwrm_ctx *ctx) * 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 and its associated response are no longer valid. + * 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 @@ -671,3 +713,72 @@ 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; +} diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.h index c58d84cc692a..b3af7a88e2c7 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.h @@ -27,9 +27,14 @@ struct bnxt_hwrm_ctx { dma_addr_t dma_handle; struct output *resp; struct input *req; + dma_addr_t slice_handle; + void *slice_addr; + u32 slice_size; u32 req_len; enum bnxt_hwrm_ctx_flags flags; unsigned int timeout; + u32 allocated; + gfp_t gfp; }; #define BNXT_HWRM_MAX_REQ_LEN (bp->hwrm_max_req_len) @@ -140,4 +145,6 @@ void hwrm_req_timeout(struct bnxt *bp, void *req, unsigned int timeout); int hwrm_req_send(struct bnxt *bp, void *req); int hwrm_req_send_silent(struct bnxt *bp, void *req); int hwrm_req_replace(struct bnxt *bp, void *req, void *new_req, u32 len); +void hwrm_req_alloc_flags(struct bnxt *bp, void *req, gfp_t flags); +void *hwrm_req_dma_slice(struct bnxt *bp, void *req, u32 size, dma_addr_t *dma); #endif |