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Date: Thu, 25 Jun 2015 22:54:45 -0500
From: Scott Wood <scottwood@...escale.com>
To: <igal.liberman@...escale.com>
CC: <netdev@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
<madalin.bucur@...escale.com>, <pebolle@...cali.nl>
Subject: Re: [v2,5/9] fsl/fman: Add Frame Manager support
On Wed, 2015-06-24 at 22:35 +0300, igal.liberman@...escale.com wrote:
> From: Igal Liberman <Igal.Liberman@...escale.com>
>
> Add Frame Manger Driver support.
> This patch adds The FMan configuration, initialization and
> runtime control routines.
>
> Signed-off-by: Igal Liberman <Igal.Liberman@...escale.com>
> ---
> drivers/net/ethernet/freescale/fman/Kconfig | 35 +
> drivers/net/ethernet/freescale/fman/Makefile | 2 +-
> drivers/net/ethernet/freescale/fman/fm.c | 1406
> ++++++++++++++++++++
> drivers/net/ethernet/freescale/fman/fm.h | 394 ++++++
> drivers/net/ethernet/freescale/fman/fm_common.h | 142 ++
> drivers/net/ethernet/freescale/fman/fm_drv.c | 701 ++++++++++
> drivers/net/ethernet/freescale/fman/fm_drv.h | 116 ++
> drivers/net/ethernet/freescale/fman/inc/enet_ext.h | 199 +++
> drivers/net/ethernet/freescale/fman/inc/fm_ext.h | 488 +++++++
> .../net/ethernet/freescale/fman/inc/fsl_fman_drv.h | 99 ++
> drivers/net/ethernet/freescale/fman/inc/service.h | 55 +
> 11 files changed, 3636 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ethernet/freescale/fman/fm.c
> create mode 100644 drivers/net/ethernet/freescale/fman/fm.h
> create mode 100644 drivers/net/ethernet/freescale/fman/fm_common.h
> create mode 100644 drivers/net/ethernet/freescale/fman/fm_drv.c
> create mode 100644 drivers/net/ethernet/freescale/fman/fm_drv.h
> create mode 100644 drivers/net/ethernet/freescale/fman/inc/enet_ext.h
> create mode 100644 drivers/net/ethernet/freescale/fman/inc/fm_ext.h
> create mode 100644 drivers/net/ethernet/freescale/fman/inc/fsl_fman_drv.h
> create mode 100644 drivers/net/ethernet/freescale/fman/inc/service.h
Again, please start with something pared down, without extraneous features,
but *with* enough functionality to actually pass packets around. Getting
this thing into decent shape is going to be hard enough without carrying
around the excess baggage.
> diff --git a/drivers/net/ethernet/freescale/fman/Kconfig
> b/drivers/net/ethernet/freescale/fman/Kconfig
> index 825a0d5..12c75bfd 100644
> --- a/drivers/net/ethernet/freescale/fman/Kconfig
> +++ b/drivers/net/ethernet/freescale/fman/Kconfig
> @@ -7,3 +7,38 @@ config FSL_FMAN
> Freescale Data-Path Acceleration Architecture Frame Manager
> (FMan) support
>
> +if FSL_FMAN
> +
> +config FSL_FM_MAX_FRAME_SIZE
> + int "Maximum L2 frame size"
> + range 64 9600
> + default "1522"
> + help
> + Configure this in relation to the maximum possible MTU of your
> + network configuration. In particular, one would need to
> + increase this value in order to use jumbo frames.
> + FSL_FM_MAX_FRAME_SIZE must accommodate the Ethernet FCS
> + (4 bytes) and one ETH+VLAN header (18 bytes), to a total of
> + 22 bytes in excess of the desired L3 MTU.
> +
> + Note that having too large a FSL_FM_MAX_FRAME_SIZE (much larger
> + than the actual MTU) may lead to buffer exhaustion, especially
> + in the case of badly fragmented datagrams on the Rx path.
> + Conversely, having a FSL_FM_MAX_FRAME_SIZE smaller than the
> + actual MTU will lead to frames being dropped.
Scatter gather can't be used for jumbo frames?
Why is this a compile-time option?
> +
> +config FSL_FM_RX_EXTRA_HEADROOM
> + int "Add extra headroom at beginning of data buffers"
> + range 16 384
> + default "64"
> + help
> + Configure this to tell the Frame Manager to reserve some extra
> + space at the beginning of a data buffer on the receive path,
> + before Internal Context fields are copied. This is in addition
> + to the private data area already reserved for driver internal
> + use. The provided value must be a multiple of 16.
> +
> + This option does not affect in any way the layout of
> + transmitted buffers.
There's nothing here to indicate when a user would want to do this.
Why is this a compile-time option?
> + /* FManV3H */
> + else if (minor == 0 || minor == 2 || minor == 3) {
> + intg->fm_muram_size = 384 * 1024;
> + intg->fm_iram_size = 64 * 1024;
> + intg->fm_num_of_ctrl = 4;
> +
> + intg->bmi_max_num_of_tasks = 128;
> + intg->bmi_max_num_of_dmas = 84;
> +
> + intg->num_of_rx_ports = 8;
> + } else {
> + pr_err("Unsupported FManv3 version\n");
> + kfree(intg);
> + return NULL;
> + }
> +
> + break;
> + default:
> + pr_err("Unsupported FMan version\n");
> + kfree(intg);
> + return NULL;
> + }
Don't duplicate error paths. Use goto like the rest of the kernel.
> +
> + intg->bmi_max_fifo_size = intg->fm_muram_size;
> +
> + return intg;
> +}
> +
> +static int is_init_done(struct fman_cfg *p_fm_drv_parameters)
No Hungarian notation. Check throughout the patchset.
> +{
> + /* Checks if FMan driver parameters were initialized */
> + if (!p_fm_drv_parameters)
> + return 0;
> + return -EINVAL;
> +}
The name makes it sound like it returns a boolean, but instead it returns
either 0 or -EINVAL? Why do you need this wrapper just to do a NULL-pointer
check?
> +static void free_init_resources(struct fm_t *p_fm)
> +{
> + if (p_fm->cam_offset)
> + fm_muram_free_mem(p_fm->p_muram, p_fm->cam_offset,
> + p_fm->cam_size);
> + if (p_fm->fifo_offset)
> + fm_muram_free_mem(p_fm->p_muram, p_fm->fifo_offset,
> + p_fm->fifo_size);
> +}
> +
> +static bool is_fman_ctrl_code_loaded(struct fm_t *p_fm)
> +{
> + struct fm_iram_regs_t __iomem *p_iram;
> +
> + p_iram = (struct fm_iram_regs_t __iomem *)UINT_TO_PTR(p_fm->base_addr +
> + FM_MM_IMEM);
> +
> + return (bool)!!(in_be32(&p_iram->iready) & IRAM_READY);
> +}
> +
> +static int check_fm_parameters(struct fm_t *p_fm)
> +{
> + if (is_fman_ctrl_code_loaded(p_fm) && !p_fm->reset_on_init) {
> + pr_err("Old FMan CTRL code is loaded; FM must be reset!\n");
> + return -EDOM;
> + }
> + if (p_fm->p_fm_state_struct->rev_info.major_rev < 6) {
> + if (!p_fm->p_fm_drv_param->dma_axi_dbg_num_of_beats ||
> + (p_fm->p_fm_drv_param->dma_axi_dbg_num_of_beats >
> + DMA_MODE_MAX_AXI_DBG_NUM_OF_BEATS)) {
> + pr_err("axiDbgNumOfBeats has to be in the range 1 - %d\n",
> + DMA_MODE_MAX_AXI_DBG_NUM_OF_BEATS);
> + return -EDOM;
> + }
> + }
> + if (p_fm->p_fm_drv_param->dma_cam_num_of_entries %
> + DMA_CAM_UNITS) {
> + pr_err("dma_cam_num_of_entries has to be divisble by %d\n",
> + DMA_CAM_UNITS);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_comm_qtsh_asrt_emer >
> + p_fm->intg->dma_thresh_max_commq) {
> + pr_err("dma_comm_qtsh_asrt_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_commq);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_comm_qtsh_clr_emer >
> + p_fm->intg->dma_thresh_max_commq) {
> + pr_err("dma_comm_qtsh_clr_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_commq);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_comm_qtsh_clr_emer >=
> + p_fm->p_fm_drv_param->dma_comm_qtsh_asrt_emer) {
> + pr_err("dma_comm_qtsh_clr_emer must be smaller than
> dma_comm_qtsh_asrt_emer\n");
> + return -EDOM;
> + }
> + if (p_fm->p_fm_state_struct->rev_info.major_rev < 6) {
> + if (p_fm->p_fm_drv_param->dma_read_buf_tsh_asrt_emer >
> + p_fm->intg->dma_thresh_max_buf) {
> + pr_err("dma_read_buf_tsh_asrt_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_buf);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_read_buf_tsh_clr_emer >
> + p_fm->intg->dma_thresh_max_buf) {
> + pr_err("dma_read_buf_tsh_clr_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_buf);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_read_buf_tsh_clr_emer >=
> + p_fm->p_fm_drv_param->dma_read_buf_tsh_asrt_emer) {
> + pr_err("dma_read_buf_tsh_clr_emer must be <
> dma_read_buf_tsh_asrt_emer\n");
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_write_buf_tsh_asrt_emer >
> + p_fm->intg->dma_thresh_max_buf) {
> + pr_err("dma_write_buf_tsh_asrt_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_buf);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_write_buf_tsh_clr_emer >
> + p_fm->intg->dma_thresh_max_buf) {
> + pr_err("dma_write_buf_tsh_clr_emer can not be larger than %d\n",
> + p_fm->intg->dma_thresh_max_buf);
> + return -EDOM;
> + }
> + if (p_fm->p_fm_drv_param->dma_write_buf_tsh_clr_emer >=
> + p_fm->p_fm_drv_param->dma_write_buf_tsh_asrt_emer) {
> + pr_err("dma_write_buf_tsh_clr_emer has to be less than
> dma_write_buf_tsh_asrt_emer\n");
> + return -EDOM;
> + }
> + } else {
> + if ((p_fm->p_fm_drv_param->dma_dbg_cnt_mode ==
> + E_FMAN_DMA_DBG_CNT_INT_READ_EM) ||
> + (p_fm->p_fm_drv_param->dma_dbg_cnt_mode ==
> + E_FMAN_DMA_DBG_CNT_INT_WRITE_EM) ||
> + (p_fm->p_fm_drv_param->dma_dbg_cnt_mode ==
> + E_FMAN_DMA_DBG_CNT_RAW_WAR_PROT)) {
> + pr_err("dma_dbg_cnt_mode value not supported by this integration.\n");
> + return -EDOM;
> + }
> + if ((p_fm->p_fm_drv_param->dma_emergency_bus_select ==
> + FM_DMA_MURAM_READ_EMERGENCY) ||
> + (p_fm->p_fm_drv_param->dma_emergency_bus_select ==
> + FM_DMA_MURAM_WRITE_EMERGENCY)) {
> + pr_err("emergencyBusSelect value not supported by this integration.\n");
> + return -EDOM;
> + }
What do you mean by "integration"?
Why are there still camelCaps in strings?
> +static void unimplemented_isr(void __maybe_unused *h_src_arg)
> +{
> + pr_err("Unimplemented ISR!\n");
> +}
> +
> +
This message is severely lacking in context.
> +static int init_fm_dma(struct fm_t *p_fm)
> +{
> + int err;
> +
> + err = (int)fman_dma_init(p_fm->p_fm_dma_regs,
> + p_fm->p_fm_drv_param);
> + if (err != 0)
> + return err;
> +
> + /* Allocate MURAM for CAM */
> + p_fm->cam_size = (uint32_t)(p_fm->p_fm_drv_param->
> + dma_cam_num_of_entries *
> + DMA_CAM_SIZEOF_ENTRY);
> + p_fm->cam_offset = fm_muram_alloc(p_fm->p_muram, p_fm->cam_size);
> + if (IS_ERR_VALUE(p_fm->cam_offset)) {
> + pr_err("MURAM alloc for DMA CAM failed\n");
> + return -ENOMEM;
> + }
> +
> + if (p_fm->p_fm_state_struct->rev_info.major_rev == 2) {
> + uintptr_t cam_base_addr;
u32 __iomem *cam_base_addr;
> +
> + fm_muram_free_mem(p_fm->p_muram, p_fm->cam_offset,
> + p_fm->cam_size);
> +
> + p_fm->cam_size =
> + p_fm->p_fm_drv_param->dma_cam_num_of_entries * 72 + 128;
> + p_fm->cam_offset = fm_muram_alloc(p_fm->p_muram, (uint32_t)
> + p_fm->cam_size);
> + pr_err("MURAM alloc for DMA CAM failed\n");
> + return -ENOMEM;
> + }
> +
> + cam_base_addr = fm_muram_offset_to_vbase(p_fm->p_muram,
> + p_fm->cam_offset);
> + switch (p_fm->p_fm_drv_param->dma_cam_num_of_entries) {
> + case (8):
> + out_be32((uint32_t __iomem *)cam_base_addr,
> + 0xff000000);
> + break;
> + case (16):
> + out_be32((uint32_t __iomem *)cam_base_addr,
> + 0xffff0000);
> + break;
> + case (24):
> + out_be32((uint32_t __iomem *)cam_base_addr,
> + 0xffffff00);
> + break;
> + case (32):
> + out_be32((uint32_t __iomem *)cam_base_addr,
> + 0xffffffff);
> + break;
> + default:
> + pr_err("wrong dma_cam_num_of_entries\n");
> + return -EDOM;
> + }
> + }
> +
Please don't use -EDOM for situations where the entire rest of the kernel
uses -EINVAL.
Unnecessary parentheses.
Couldn't this just be replaced with:
out_be32(cam_base_addr, ~(1 << (32 - dma_cam_num_of_entries)) - 1);
?
> void *fm_config(struct fm_params_t *p_fm_param)
> +{
> + struct fm_t *p_fm;
> + uintptr_t base_addr;
> +
> + if (!((p_fm_param->firmware.p_code && p_fm_param->firmware.size) ||
> + (!p_fm_param->firmware.p_code && !p_fm_param->firmware.size)))
> + return NULL;
> +
> + base_addr = p_fm_param->base_addr;
> +
> + /* Allocate FM structure */
> + p_fm = kzalloc(sizeof(*p_fm), GFP_KERNEL);
> + if (!p_fm)
> + return NULL;
> +
> + p_fm->p_fm_state_struct = kzalloc(sizeof(*p_fm->p_fm_state_struct),
> + GFP_KERNEL);
> + if (!p_fm->p_fm_state_struct) {
> + kfree(p_fm);
> + pr_err("FM Status structure\n");
> + return NULL;
> + }
It's generally not recommended to print an error on memory allocation
failure, but this message doesn't even make sense.
> + if (p_fm->p_fm_state_struct->rev_info.major_rev < 6 &&
> + p_fm->p_fm_state_struct->rev_info.major_rev != 4 &&
> + p_fm->reset_on_init) {
> + err = fw_not_reset_erratum_bugzilla6173wa(p_fm);
> + if (err != 0)
> + return err;
bugzilla6173wa?
> + } else {
> + /* Reset the FM if required. */
> + if (p_fm->reset_on_init) {
> + u32 svr = mfspr(SPRN_SVR);
> +
> + if (((SVR_SOC_VER(svr) == SVR_T4240 &&
> + SVR_REV(svr) > 0x10)) ||
> + ((SVR_SOC_VER(svr) == SVR_T4160 &&
> + SVR_REV(svr) > 0x10)) ||
> + ((SVR_SOC_VER(svr) == SVR_T4080 &&
> + SVR_REV(svr) > 0x10)) ||
> + (SVR_SOC_VER(svr) == SVR_T2080) ||
> + (SVR_SOC_VER(svr) == SVR_T2081)) {
> + pr_debug("Hack: No FM reset!\n");
if (IS_ERR_VALUE(p_fm->cam_offset)) {
Why?
> + } else {
> + out_be32(&p_fm->p_fm_fpm_regs->fm_rstc,
> + FPM_RSTC_FM_RESET);
> + /* Memory barrier */
> + mb();
> + usleep_range(100, 101);
> + }
> +
> + if (fman_is_qmi_halt_not_busy_state(
> + p_fm->p_fm_qmi_regs)) {
Don't align continuation lines with the if-body.
> + fman_resume(p_fm->p_fm_fpm_regs);
> + usleep_range(100, 101);
> + }
> + }
> +
Why such a narrow range in usleep_range()?
> +/* Macro for calling MAC error interrupt handler */
> +#define FM_M_CALL_MAC_ERR_ISR(_p_fm, _id) \
> + (_p_fm->intr_mng[(enum fm_inter_module_event)(FM_EV_ERR_MAC0 + _id)]. \
> + f_isr(p_fm->intr_mng[(enum fm_inter_module_event)\
> + (FM_EV_ERR_MAC0 + _id)].h_src_handle))
Why are you casting to an enum just to use it as an array index?
> +int fm_set_exception(struct fm_t *p_fm, enum fm_exceptions exception,
> + bool enable)
> +{
> + uint32_t bit_mask = 0;
> + enum fman_exceptions fsl_exception;
> + struct fman_rg fman_rg;
> + int ret;
> +
> + ret = is_init_done(p_fm->p_fm_drv_param);
> + if (ret)
> + return ret;
> +
> + fman_rg.bmi_rg = p_fm->p_fm_bmi_regs;
> + fman_rg.qmi_rg = p_fm->p_fm_qmi_regs;
> + fman_rg.fpm_rg = p_fm->p_fm_fpm_regs;
> + fman_rg.dma_rg = p_fm->p_fm_dma_regs;
> +
> + GET_EXCEPTION_FLAG(bit_mask, exception);
> + if (bit_mask) {
> + if (enable)
> + p_fm->p_fm_state_struct->exceptions |= bit_mask;
> + else
> + p_fm->p_fm_state_struct->exceptions &= ~bit_mask;
> +
> + FMAN_EXCEPTION_TRANS(fsl_exception, exception);
> +
> + return (int)fman_set_exception(&fman_rg,
> + fsl_exception, enable);
fman_set_exception() already returns int.
> + } else {
> + pr_err("Undefined exceptioni\n");
Typo.
> + return -EDOM;
Math argument out of range of function?
What math function is involved?
> +/* Prevents the use of TX port 1 with OP port 0 for FM Major Rev 4 (P1023)
> */
>
> +#define FM_LOW_END_RESTRICTION
This is never used (and would be a multiplatform violation if it were).
> +
> +#define GET_EXCEPTION_FLAG(bit_mask, exception) \
> +do { \
> + switch ((int)exception) { \
> + case FM_EX_DMA_BUS_ERROR: \
> + bit_mask = FM_EX_DMA_BUS_ERROR; \
> + break; \
> + case FM_EX_DMA_SINGLE_PORT_ECC: \
> + bit_mask = FM_EX_DMA_SINGLE_PORT_ECC; \
> + break; \
> + case FM_EX_DMA_READ_ECC: \
> + bit_mask = FM_EX_DMA_READ_ECC; \
> + break; \
> + case FM_EX_DMA_SYSTEM_WRITE_ECC: \
> + bit_mask = FM_EX_DMA_SYSTEM_WRITE_ECC; \
> + break; \
> + case FM_EX_DMA_FM_WRITE_ECC: \
> + bit_mask = FM_EX_DMA_FM_WRITE_ECC; \
> + break; \
> + case FM_EX_FPM_STALL_ON_TASKS: \
> + bit_mask = FM_EX_FPM_STALL_ON_TASKS; \
> + break; \
> + case FM_EX_FPM_SINGLE_ECC: \
> + bit_mask = FM_EX_FPM_SINGLE_ECC; \
> + break; \
> + case FM_EX_FPM_DOUBLE_ECC: \
> + bit_mask = FM_EX_FPM_DOUBLE_ECC; \
> + break; \
> + case FM_EX_QMI_SINGLE_ECC: \
> + bit_mask = FM_EX_QMI_SINGLE_ECC; \
> + break; \
> + case FM_EX_QMI_DOUBLE_ECC: \
> + bit_mask = FM_EX_QMI_DOUBLE_ECC; \
> + break; \
> + case FM_EX_QMI_DEQ_FROM_UNKNOWN_PORTID: \
> + bit_mask = FM_EX_QMI_DEQ_FROM_UNKNOWN_PORTID; \
> + break; \
> + case FM_EX_BMI_LIST_RAM_ECC: \
> + bit_mask = FM_EX_BMI_LIST_RAM_ECC; \
> + break; \
> + case FM_EX_BMI_STORAGE_PROFILE_ECC: \
> + bit_mask = FM_EX_BMI_STORAGE_PROFILE_ECC; \
> + break; \
> + case FM_EX_BMI_STATISTICS_RAM_ECC: \
> + bit_mask = FM_EX_BMI_STATISTICS_RAM_ECC; \
> + break; \
> + case FM_EX_BMI_DISPATCH_RAM_ECC: \
> + bit_mask = FM_EX_BMI_DISPATCH_RAM_ECC; \
> + break; \
> + case FM_EX_IRAM_ECC: \
> + bit_mask = FM_EX_IRAM_ECC; \
> + break; \
> + case FM_EX_MURAM_ECC: \
> + bit_mask = FM_EX_MURAM_ECC; \
> + break; \
> + default: \
> + bit_mask = 0; \
> + break; \
> + } \
> +} while (0)
> +
> +#define GET_FM_MODULE_EVENT(_p_fm, _mod, _id, _intr_type, _event) \
> +do { \
> + switch (_mod) { \
> + case (FM_MOD_PRS): \
> + if (_id) \
> + _event = FM_EV_DUMMY_LAST; \
> + else \
> + event = (_intr_type == FM_INTR_TYPE_ERR) ? \
> + FM_EV_ERR_PRS : FM_EV_PRS; \
> + break; \
> + case (FM_MOD_TMR): \
> + if (_id) \
> + _event = FM_EV_DUMMY_LAST; \
> + else \
> + _event = (_intr_type == FM_INTR_TYPE_ERR) ? \
> + FM_EV_DUMMY_LAST : FM_EV_TMR; \
> + break; \
> + case (FM_MOD_MAC): \
> + _event = (_intr_type == FM_INTR_TYPE_ERR) ? \
> + (FM_EV_ERR_MAC0 + _id) : \
> + (FM_EV_MAC0 + _id); \
> + break; \
> + case (FM_MOD_FMAN_CTRL): \
> + if (_intr_type == FM_INTR_TYPE_ERR) \
> + _event = FM_EV_DUMMY_LAST; \
> + else \
> + _event = (FM_EV_FMAN_CTRL_0 + _id); \
> + break; \
> + default: \
> + _event = FM_EV_DUMMY_LAST; \
> + break; \
> + } \
> +} while (0)
Use functions instead of macros wherever possible.
> +/* do not change! if changed, must be disabled for rev1 ! */
> +#define DFLT_VERIFY_UCODE false
I know I complained about this last time...
> +
> +#define DFLT_DMA_READ_INT_BUF_LOW(dma_thresh_max_buf) \
> + ((dma_thresh_max_buf + 1) / 2)
> +#define DFLT_DMA_READ_INT_BUF_HIGH(dma_thresh_max_buf) \
> + ((dma_thresh_max_buf + 1) * 3 / 4)
> +#define DFLT_DMA_WRITE_INT_BUF_LOW(dma_thresh_max_buf) \
> + ((dma_thresh_max_buf + 1) / 2)
> +#define DFLT_DMA_WRITE_INT_BUF_HIGH(dma_thresh_max_buf)\
> + ((dma_thresh_max_buf + 1) * 3 / 4)
> +#define DFLT_DMA_COMM_Q_LOW(major, dma_thresh_max_commq) \
> + ((major == 6) ? 0x2A : ((dma_thresh_max_commq + 1) / 2))
> +#define DFLT_DMA_COMM_Q_HIGH(major, dma_thresh_max_commq) \
> + ((major == 6) ? 0x3f : ((dma_thresh_max_commq + 1) * 3 / 4))
> +#define DFLT_TOTAL_NUM_OF_TASKS(major, minor, bmi_max_num_of_tasks) \
> + ((major == 6) ? ((minor == 1 || minor == 4) ? 59 : 124) : \
> + bmi_max_num_of_tasks)
Where do 0x2a, 0x3f, 59, 124, etc come from? Please define symbolically.
> +#define DFLT_TOTAL_FIFO_SIZE(major, minor) \
> + ((major == 6) ? \
> + ((minor == 1 || minor == 4) ? (156 * 1024) : (295 * 1024)) : \
> + (((major == 2) || (major == 5)) ? \
> + (100 * 1024) : ((major == 4) ? \
> + (46 * 1024) : (122 * 1024))))
This isn't the International Obfuscated C Code Contest.
>
> +/* Memory Mapped Registers */
> +
> +struct fm_iram_regs_t {
> + uint32_t iadd; /* FM IRAM instruction address register */
> + uint32_t idata;/* FM IRAM instruction data register */
> + uint32_t itcfg;/* FM IRAM timing config register */
> + uint32_t iready;/* FM IRAM ready register */
> + uint8_t res[0x80000 - 0x10];
> +} __attribute__((__packed__));
Why do you need __packed__ on this?
Why do you need the padding on the end?
> +struct fm_t {
> + uintptr_t base_addr;
> + char fm_module_name[MODULE_NAME_SIZE];
> + struct fm_intr_src_t intr_mng[FM_EV_DUMMY_LAST];
> +
> + struct fman_fpm_regs __iomem *p_fm_fpm_regs;
> + struct fman_bmi_regs __iomem *p_fm_bmi_regs;
> + struct fman_qmi_regs __iomem *p_fm_qmi_regs;
> + struct fman_dma_regs __iomem *p_fm_dma_regs;
> + struct fman_regs __iomem *p_fm_regs;
> + fm_exceptions_cb *f_exception;
> + fm_bus_error_cb *f_bus_error;
> + void *h_app; /* Application handle */
> + spinlock_t *spinlock;
Why is the spinlock dynamically allocated?
> +/* Bootarg used to override the Kconfig FSL_FM_MAX_FRAME_SIZE value */
> +#define FSL_FM_MAX_FRM_BOOTARG "fsl_fm_max_frm"
> +
> +/* Bootarg used to override FSL_FM_RX_EXTRA_HEADROOM Kconfig value */
> +#define FSL_FM_RX_EXTRA_HEADROOM_BOOTARG "fsl_fm_rx_extra_headroom"
Is this indirection really needed?
> +/* Extra headroom for Rx buffers.
> + * FMan is instructed to allocate, on the Rx path, this amount of
> + * space at the beginning of a data buffer, beside the DPA private
> + * data area and the IC fields.
> + * Does not impact Tx buffer layout.
> + * Configurable from Kconfig or bootargs. Zero by default, it's needed on
> + * particular forwarding scenarios that add extra headers to the
> + * forwarded frame.
> + */
> +int fsl_fm_rx_extra_headroom = CONFIG_FSL_FM_RX_EXTRA_HEADROOM;
If it's configurable via bootargs, why is the kconfig needed?
> +
> +u16 fm_get_max_frm(void)
> +{
> + return fsl_fm_max_frm;
> +}
> +EXPORT_SYMBOL(fm_get_max_frm);
fsl_fm_max_frm isn't static, so why is this accessor needed?
> +int fm_get_rx_extra_headroom(void)
> +{
> + return ALIGN(fsl_fm_rx_extra_headroom, 16);
> +}
> +EXPORT_SYMBOL(fm_get_rx_extra_headroom);
Why not just align it when you set the variable?
> +
> +static int __init fm_set_max_frm(char *str)
> +{
> + int ret = 0;
> +
> + ret = get_option(&str, &fsl_fm_max_frm);
> + if (ret != 1) {
> + /* This will only work if CONFIG_EARLY_PRINTK is compiled in,
> + * and something like "earlyprintk=serial,uart0,115200" is
> + * specified in the bootargs.
> + */
> + pr_err("No suitable %s=<int> prop in bootargs; will use the default
> FSL_FM_MAX_FRAME_SIZE (%d) from Kconfig.\n",
> + FSL_FM_MAX_FRM_BOOTARG,
> + CONFIG_FSL_FM_MAX_FRAME_SIZE);
> +
> + fsl_fm_max_frm = CONFIG_FSL_FM_MAX_FRAME_SIZE;
> + return 1;
> + }
> +
> + /* Don't allow invalid bootargs; fallback to the Kconfig value */
> + if (fsl_fm_max_frm < 64 || fsl_fm_max_frm > 9600) {
> + pr_err("Invalid %s=%d in bootargs, valid range is 64-9600. Falling back
> to the FSL_FM_MAX_FRAME_SIZE (%d) from Kconfig.\n",
> + FSL_FM_MAX_FRM_BOOTARG, fsl_fm_max_frm,
> + CONFIG_FSL_FM_MAX_FRAME_SIZE);
> +
> + fsl_fm_max_frm = CONFIG_FSL_FM_MAX_FRAME_SIZE;
> + return 1;
> + }
> +
> + pr_info("Using fsl_fm_max_frm=%d from bootargs\n", fsl_fm_max_frm);
> + return 0;
> +}
> +early_param(FSL_FM_MAX_FRM_BOOTARG, fm_set_max_frm);
> +
> +static int __init fm_set_rx_extra_headroom(char *str)
> +{
> + int ret;
> +
> + ret = get_option(&str, &fsl_fm_rx_extra_headroom);
> +
> + if (ret != 1) {
> + pr_err("No suitable %s=<int> prop in bootargs; will use the default
> FSL_FM_RX_EXTRA_HEADROOM (%d) from Kconfig.\n",
> + FSL_FM_RX_EXTRA_HEADROOM_BOOTARG,
> + CONFIG_FSL_FM_RX_EXTRA_HEADROOM);
> + fsl_fm_rx_extra_headroom = CONFIG_FSL_FM_RX_EXTRA_HEADROOM;
> +
> + return 1;
> + }
> +
> + if (fsl_fm_rx_extra_headroom < FSL_FM_RX_EXTRA_HEADROOM_MIN ||
> + fsl_fm_rx_extra_headroom > FSL_FM_RX_EXTRA_HEADROOM_MAX) {
> + pr_err("Invalid value for %s=%d prop in bootargs; will use the default
> FSL_FM_RX_EXTRA_HEADROOM (%d) from Kconfig.\n",
> + FSL_FM_RX_EXTRA_HEADROOM_BOOTARG,
> + fsl_fm_rx_extra_headroom,
> + CONFIG_FSL_FM_RX_EXTRA_HEADROOM);
> + fsl_fm_rx_extra_headroom = CONFIG_FSL_FM_RX_EXTRA_HEADROOM;
> + }
> +
> + pr_info("Using fsl_fm_rx_extra_headroom=%d from bootargs\n",
> + fsl_fm_rx_extra_headroom);
This is unnecessarily verbose.
> +
> + return 0;
> +}
> +early_param(FSL_FM_RX_EXTRA_HEADROOM_BOOTARG, fm_set_rx_extra_headroom);
Why early?
> +static irqreturn_t fm_err_irq(int irq, void *_dev)
> +{
> + struct fm_drv_t *fm_drv = (struct fm_drv_t *)_dev;
> +
> + if (!fm_drv || !fm_drv->h_dev)
> + return IRQ_NONE;
Why would you request the IRQ if either of these are NULL?
> +static const struct qe_firmware *find_fman_microcode(void)
> +{
> + static const struct qe_firmware *uc_patch;
> + struct device_node *np;
> +
> + if (uc_patch)
> + return uc_patch;
> +
> + /* The firmware should be inside the device tree. */
> + np = of_find_compatible_node(NULL, NULL, "fsl,fman-firmware");
> + if (np) {
> + uc_patch = of_get_property(np, "fsl,firmware", NULL);
I don't see any binding for this.
> +static int fill_qman_channhels_info(struct fm_drv_t *fm_drv)
"channhels"?
> +static struct fm_drv_t *read_fm_dev_tree_node(struct platform_device
> *of_dev)
> +{
> + struct fm_drv_t *fm_drv;
> + struct device_node *fm_node, *dev_node;
> + struct of_device_id name;
> + struct resource res;
> + const uint32_t *uint32_prop;
> + int lenp, err;
> + struct clk *clk;
> + u32 clk_rate;
> +
> + fm_node = of_node_get(of_dev->dev.of_node);
> +
> + uint32_prop = (uint32_t *)of_get_property(fm_node, "cell-index",
> + &lenp);
> + if (unlikely(!uint32_prop)) {
> + pr_err("of_get_property(%s, cell-index) failed\n",
> + fm_node->full_name);
> + goto _return_null;
> + }
> + if (WARN_ON(lenp != sizeof(uint32_t)))
> + return NULL;
> +
> + fm_drv = kzalloc(sizeof(*fm_drv), GFP_KERNEL);
> + if (!fm_drv)
> + goto _return_null;
> +
> + fm_drv->dev = &of_dev->dev;
> + fm_drv->id = (u8)*uint32_prop;
> +
> + /* Get the FM interrupt */
> + fm_drv->irq = of_irq_to_resource(fm_node, 0, NULL);
> + if (unlikely(fm_drv->irq == 0)) {
> + pr_err("of_irq_to_resource() = %d\n", NO_IRQ);
> + goto _return_null;
> + }
> +
> + /* Get the FM error interrupt */
> + fm_drv->err_irq = of_irq_to_resource(fm_node, 1, NULL);
> +
> + /* Get the FM address */
> + err = of_address_to_resource(fm_node, 0, &res);
> + if (unlikely(err < 0)) {
> + pr_err("of_address_to_resource() = %d\n", err);
> + goto _return_null;
> + }
> +
> + fm_drv->fm_base_addr = 0;
> + fm_drv->fm_phys_base_addr = res.start;
> + fm_drv->fm_mem_size = res.end + 1 - res.start;
> +
Why are you using these OF functions rather than using platform_device
mechanisms?
> + clk = clk_get(fm_drv->dev, fm_drv->id == 0 ? "fm0clk" : "fm1clk");
> + if (IS_ERR(clk)) {
> + pr_err("Failed to get FM%d clock structure\n", fm_drv->id);
> + goto _return_null;
> + }
Get the clock from the clocks property of the device tree node, not by
hardcoding what you think the clock's name will be.
> + uint32_prop = (uint32_t *)of_get_property(fm_node,
> + "fsl,qman-channel-range",
> + &lenp);
>
Don't cast away the const.
> + if (unlikely(!uint32_prop)) {
Don't use unlikely() in paths that aren't performance-critical.
> + /* Get the MURAM base address and size */
> + memset(&name, 0, sizeof(name));
> + if (WARN_ON(strlen("muram") >= sizeof(name.name)))
> + goto _return_null;
> + strcpy(name.name, "muram");
> + if (WARN_ON(strlen("fsl,fman-muram") >= sizeof(name.compatible)))
> + goto _return_null;
> + strcpy(name.compatible, "fsl,fman-muram");
> + for_each_child_of_node(fm_node, dev_node) {
> + if (likely(of_match_node(&name, dev_node))) {
Why not just define the match struct statically?
> +#ifndef __SERVICE_h
> +#define __SERVICE_h
> +
> +#include <linux/version.h>
What do you need this for?
> +
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/io.h>
What do you use in this file from linux/io.h?
> +/* Define ASSERT condition */
> +#undef ASSERT
> +#define ASSERT(x) WARN_ON(!(x))
Why not just use WARN_ON directly?
> +/* Pointers Manipulation */
> +#define UINT_TO_PTR(_val) ((void __iomem *)(uintptr_t)(_val))
Why are you doing so much of this that you need macros for it?
UINT_TO_PTR seems like it could be hiding 64-bit-cleanliness bugs. From
looking at the places it's used, it certainly would be if the value fed into
it were actually "unsigned int".
Just define base_addr and such as "void __iomem *".
> +#define PTR_MOVE(_ptr, _offset) (void *)((uint8_t *)(_ptr) + (_offset))
I don't see this used anywhere. Likewise IN_RANGE and ILLEGAL_BASE.
-Scott
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