diff options
Diffstat (limited to 'drivers/net/ethernet/netronome')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c | 196 |
1 files changed, 191 insertions, 5 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c index 28262b0fc89a..dd6256841a37 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c @@ -13,6 +13,7 @@ #include <linux/firmware.h> #include <linux/kernel.h> #include <linux/kthread.h> +#include <linux/overflow.h> #include <linux/sizes.h> #include <linux/slab.h> @@ -37,6 +38,7 @@ #define NSP_COMMAND 0x08 #define NSP_COMMAND_OPTION GENMASK_ULL(63, 32) #define NSP_COMMAND_CODE GENMASK_ULL(31, 16) +#define NSP_COMMAND_DMA_BUF BIT_ULL(1) #define NSP_COMMAND_START BIT_ULL(0) /* CPP address to retrieve the data from */ @@ -49,9 +51,12 @@ #define NSP_DFLT_BUFFER_ADDRESS GENMASK_ULL(39, 0) #define NSP_DFLT_BUFFER_CONFIG 0x20 +#define NSP_DFLT_BUFFER_DMA_CHUNK_ORDER GENMASK_ULL(63, 58) #define NSP_DFLT_BUFFER_SIZE_4KB GENMASK_ULL(15, 8) #define NSP_DFLT_BUFFER_SIZE_MB GENMASK_ULL(7, 0) +#define NFP_CAP_CMD_DMA_SG 0x28 + #define NSP_MAGIC 0xab10 #define NSP_MAJOR 0 #define NSP_MINOR 8 @@ -92,6 +97,16 @@ enum nfp_nsp_cmd { SPCODE_VERSIONS = 21, /* Report FW versions */ }; +struct nfp_nsp_dma_buf { + __le32 chunk_cnt; + __le32 reserved[3]; + struct { + __le32 size; + __le32 reserved; + __le64 addr; + } descs[]; +}; + static const struct { int code; const char *msg; @@ -120,6 +135,7 @@ struct nfp_nsp { /** * struct nfp_nsp_command_arg - NFP command argument structure * @code: NFP SP Command Code + * @dma: @buf points to a host buffer, not NSP buffer * @timeout_sec:Timeout value to wait for completion in seconds * @option: NFP SP Command Argument * @buf: NFP SP Buffer Address @@ -127,6 +143,7 @@ struct nfp_nsp { */ struct nfp_nsp_command_arg { u16 code; + bool dma; unsigned int timeout_sec; u32 option; u64 buf; @@ -350,6 +367,7 @@ __nfp_nsp_command(struct nfp_nsp *state, const struct nfp_nsp_command_arg *arg) err = nfp_cpp_writeq(cpp, nsp_cpp, nsp_command, FIELD_PREP(NSP_COMMAND_OPTION, arg->option) | FIELD_PREP(NSP_COMMAND_CODE, arg->code) | + FIELD_PREP(NSP_COMMAND_DMA_BUF, arg->dma) | FIELD_PREP(NSP_COMMAND_START, 1)); if (err < 0) return err; @@ -457,9 +475,173 @@ nfp_nsp_command_buf_def(struct nfp_nsp *nsp, } static int +nfp_nsp_command_buf_dma_sg(struct nfp_nsp *nsp, + struct nfp_nsp_command_buf_arg *arg, + unsigned int max_size, unsigned int chunk_order, + unsigned int dma_order) +{ + struct nfp_cpp *cpp = nsp->cpp; + struct nfp_nsp_dma_buf *desc; + struct { + dma_addr_t dma_addr; + unsigned long len; + void *chunk; + } *chunks; + size_t chunk_size, dma_size; + dma_addr_t dma_desc; + struct device *dev; + unsigned long off; + int i, ret, nseg; + size_t desc_sz; + + chunk_size = BIT_ULL(chunk_order); + dma_size = BIT_ULL(dma_order); + nseg = DIV_ROUND_UP(max_size, chunk_size); + + chunks = kzalloc(array_size(sizeof(*chunks), nseg), GFP_KERNEL); + if (!chunks) + return -ENOMEM; + + off = 0; + ret = -ENOMEM; + for (i = 0; i < nseg; i++) { + unsigned long coff; + + chunks[i].chunk = kmalloc(chunk_size, + GFP_KERNEL | __GFP_NOWARN); + if (!chunks[i].chunk) + goto exit_free_prev; + + chunks[i].len = min_t(u64, chunk_size, max_size - off); + + coff = 0; + if (arg->in_size > off) { + coff = min_t(u64, arg->in_size - off, chunk_size); + memcpy(chunks[i].chunk, arg->in_buf + off, coff); + } + memset(chunks[i].chunk + coff, 0, chunk_size - coff); + + off += chunks[i].len; + } + + dev = nfp_cpp_device(cpp)->parent; + + for (i = 0; i < nseg; i++) { + dma_addr_t addr; + + addr = dma_map_single(dev, chunks[i].chunk, chunks[i].len, + DMA_BIDIRECTIONAL); + chunks[i].dma_addr = addr; + + ret = dma_mapping_error(dev, addr); + if (ret) + goto exit_unmap_prev; + + if (WARN_ONCE(round_down(addr, dma_size) != + round_down(addr + chunks[i].len - 1, dma_size), + "unaligned DMA address: %pad %lu %zd\n", + &addr, chunks[i].len, dma_size)) { + ret = -EFAULT; + i++; + goto exit_unmap_prev; + } + } + + desc_sz = struct_size(desc, descs, nseg); + desc = kmalloc(desc_sz, GFP_KERNEL); + if (!desc) { + ret = -ENOMEM; + goto exit_unmap_all; + } + + desc->chunk_cnt = cpu_to_le32(nseg); + for (i = 0; i < nseg; i++) { + desc->descs[i].size = cpu_to_le32(chunks[i].len); + desc->descs[i].addr = cpu_to_le64(chunks[i].dma_addr); + } + + dma_desc = dma_map_single(dev, desc, desc_sz, DMA_TO_DEVICE); + ret = dma_mapping_error(dev, dma_desc); + if (ret) + goto exit_free_desc; + + arg->arg.dma = true; + arg->arg.buf = dma_desc; + ret = __nfp_nsp_command(nsp, &arg->arg); + if (ret < 0) + goto exit_unmap_desc; + + i = 0; + off = 0; + while (off < arg->out_size) { + unsigned int len; + + len = min_t(u64, chunks[i].len, arg->out_size - off); + memcpy(arg->out_buf + off, chunks[i].chunk, len); + off += len; + i++; + } + +exit_unmap_desc: + dma_unmap_single(dev, dma_desc, desc_sz, DMA_TO_DEVICE); +exit_free_desc: + kfree(desc); +exit_unmap_all: + i = nseg; +exit_unmap_prev: + while (--i >= 0) + dma_unmap_single(dev, chunks[i].dma_addr, chunks[i].len, + DMA_BIDIRECTIONAL); + i = nseg; +exit_free_prev: + while (--i >= 0) + kfree(chunks[i].chunk); + kfree(chunks); + if (ret < 0) + nfp_err(cpp, "NSP: SG DMA failed for command 0x%04x: %d (sz:%d cord:%d)\n", + arg->arg.code, ret, max_size, chunk_order); + return ret; +} + +static int +nfp_nsp_command_buf_dma(struct nfp_nsp *nsp, + struct nfp_nsp_command_buf_arg *arg, + unsigned int max_size, unsigned int dma_order) +{ + unsigned int chunk_order, buf_order; + struct nfp_cpp *cpp = nsp->cpp; + bool sg_ok; + u64 reg; + int err; + + buf_order = order_base_2(roundup_pow_of_two(max_size)); + + err = nfp_cpp_readq(cpp, nfp_resource_cpp_id(nsp->res), + nfp_resource_address(nsp->res) + NFP_CAP_CMD_DMA_SG, + ®); + if (err < 0) + return err; + sg_ok = reg & BIT_ULL(arg->arg.code - 1); + + if (!sg_ok) { + if (buf_order > dma_order) { + nfp_err(cpp, "NSP: can't service non-SG DMA for command 0x%04x\n", + arg->arg.code); + return -ENOMEM; + } + chunk_order = buf_order; + } else { + chunk_order = min_t(unsigned int, dma_order, PAGE_SHIFT); + } + + return nfp_nsp_command_buf_dma_sg(nsp, arg, max_size, chunk_order, + dma_order); +} + +static int nfp_nsp_command_buf(struct nfp_nsp *nsp, struct nfp_nsp_command_buf_arg *arg) { - unsigned int def_size, max_size; + unsigned int dma_order, def_size, max_size; struct nfp_cpp *cpp = nsp->cpp; u64 reg; int err; @@ -484,12 +666,16 @@ nfp_nsp_command_buf(struct nfp_nsp *nsp, struct nfp_nsp_command_buf_arg *arg) max_size = max(arg->in_size, arg->out_size); def_size = FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M + FIELD_GET(NSP_DFLT_BUFFER_SIZE_4KB, reg) * SZ_4K; - if (def_size >= max_size) + dma_order = FIELD_GET(NSP_DFLT_BUFFER_DMA_CHUNK_ORDER, reg); + if (def_size >= max_size) { return nfp_nsp_command_buf_def(nsp, arg); + } else if (!dma_order) { + nfp_err(cpp, "NSP: default buffer too small for command 0x%04x (%u < %u)\n", + arg->arg.code, def_size, max_size); + return -EINVAL; + } - nfp_err(cpp, "NSP: default buffer too small for command 0x%04x (%u < %u)\n", - arg->arg.code, def_size, max_size); - return -EINVAL; + return nfp_nsp_command_buf_dma(nsp, arg, max_size, dma_order); } int nfp_nsp_wait(struct nfp_nsp *state) |