From 94ce9caa0f75b0d56e69550e84d7a1653f0ef3b0 Mon Sep 17 00:00:00 2001 From: Prashant Sreedharan Date: Mon, 18 Jul 2016 07:15:21 -0400 Subject: [PATCH] bnxt_en: Workaround Nitro A0 hardware RX bug (part 1). Nitro A0 has a hardware bug in the rx path. The workaround is to create a special COS context as a path for non-RSS (non-IP) packets. Without this workaround, the chip may stall when receiving RSS and non-RSS packets. Add infrastructure to allow 2 contexts (RSS and CoS) per VNIC. Allocate and configure the CoS context for Nitro A0. Signed-off-by: Prashant Sreedharan Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 52 ++++++++++++++++------- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 3 +- 2 files changed, 39 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 4970e72eeb9e..de740125b773 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -2357,7 +2357,8 @@ static void bnxt_init_vnics(struct bnxt *bp) struct bnxt_vnic_info *vnic = &bp->vnic_info[i]; vnic->fw_vnic_id = INVALID_HW_RING_ID; - vnic->fw_rss_cos_lb_ctx = INVALID_HW_RING_ID; + vnic->fw_rss_cos_lb_ctx[0] = INVALID_HW_RING_ID; + vnic->fw_rss_cos_lb_ctx[1] = INVALID_HW_RING_ID; vnic->fw_l2_ctx_id = INVALID_HW_RING_ID; if (bp->vnic_info[i].rss_hash_key) { @@ -3308,7 +3309,7 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss) struct bnxt_vnic_info *vnic = &bp->vnic_info[vnic_id]; struct hwrm_vnic_rss_cfg_input req = {0}; - if (vnic->fw_rss_cos_lb_ctx == INVALID_HW_RING_ID) + if (vnic->fw_rss_cos_lb_ctx[0] == INVALID_HW_RING_ID) return 0; bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_RSS_CFG, -1, -1); @@ -3336,7 +3337,7 @@ static int bnxt_hwrm_vnic_set_rss(struct bnxt *bp, u16 vnic_id, bool set_rss) req.hash_key_tbl_addr = cpu_to_le64(vnic->rss_hash_key_dma_addr); } - req.rss_ctx_idx = cpu_to_le16(vnic->fw_rss_cos_lb_ctx); + req.rss_ctx_idx = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[0]); return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); } @@ -3359,32 +3360,35 @@ static int bnxt_hwrm_vnic_set_hds(struct bnxt *bp, u16 vnic_id) return hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); } -static void bnxt_hwrm_vnic_ctx_free_one(struct bnxt *bp, u16 vnic_id) +static void bnxt_hwrm_vnic_ctx_free_one(struct bnxt *bp, u16 vnic_id, + u16 ctx_idx) { struct hwrm_vnic_rss_cos_lb_ctx_free_input req = {0}; bnxt_hwrm_cmd_hdr_init(bp, &req, HWRM_VNIC_RSS_COS_LB_CTX_FREE, -1, -1); req.rss_cos_lb_ctx_id = - cpu_to_le16(bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx); + cpu_to_le16(bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[ctx_idx]); hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); - bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx = INVALID_HW_RING_ID; + bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[ctx_idx] = INVALID_HW_RING_ID; } static void bnxt_hwrm_vnic_ctx_free(struct bnxt *bp) { - int i; + int i, j; for (i = 0; i < bp->nr_vnics; i++) { struct bnxt_vnic_info *vnic = &bp->vnic_info[i]; - if (vnic->fw_rss_cos_lb_ctx != INVALID_HW_RING_ID) - bnxt_hwrm_vnic_ctx_free_one(bp, i); + for (j = 0; j < BNXT_MAX_CTX_PER_VNIC; j++) { + if (vnic->fw_rss_cos_lb_ctx[j] != INVALID_HW_RING_ID) + bnxt_hwrm_vnic_ctx_free_one(bp, i, j); + } } bp->rsscos_nr_ctxs = 0; } -static int bnxt_hwrm_vnic_ctx_alloc(struct bnxt *bp, u16 vnic_id) +static int bnxt_hwrm_vnic_ctx_alloc(struct bnxt *bp, u16 vnic_id, u16 ctx_idx) { int rc; struct hwrm_vnic_rss_cos_lb_ctx_alloc_input req = {0}; @@ -3397,7 +3401,7 @@ static int bnxt_hwrm_vnic_ctx_alloc(struct bnxt *bp, u16 vnic_id) mutex_lock(&bp->hwrm_cmd_lock); rc = _hwrm_send_message(bp, &req, sizeof(req), HWRM_CMD_TIMEOUT); if (!rc) - bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx = + bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[ctx_idx] = le16_to_cpu(resp->rss_cos_lb_ctx_id); mutex_unlock(&bp->hwrm_cmd_lock); @@ -3416,8 +3420,15 @@ static int bnxt_hwrm_vnic_cfg(struct bnxt *bp, u16 vnic_id) req.enables = cpu_to_le32(VNIC_CFG_REQ_ENABLES_DFLT_RING_GRP | VNIC_CFG_REQ_ENABLES_RSS_RULE | VNIC_CFG_REQ_ENABLES_MRU); - req.rss_rule = cpu_to_le16(vnic->fw_rss_cos_lb_ctx); - req.cos_rule = cpu_to_le16(0xffff); + req.rss_rule = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[0]); + + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) { + req.cos_rule = cpu_to_le16(vnic->fw_rss_cos_lb_ctx[1]); + req.enables |= cpu_to_le32(VNIC_CFG_REQ_ENABLES_COS_RULE); + } else { + req.cos_rule = cpu_to_le16(0xffff); + } + if (vnic->flags & BNXT_VNIC_RSS_FLAG) ring = 0; else if (vnic->flags & BNXT_VNIC_RFS_FLAG) @@ -3489,7 +3500,8 @@ static int bnxt_hwrm_vnic_alloc(struct bnxt *bp, u16 vnic_id, bp->grp_info[grp_idx].fw_grp_id; } - bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx = INVALID_HW_RING_ID; + bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[0] = INVALID_HW_RING_ID; + bp->vnic_info[vnic_id].fw_rss_cos_lb_ctx[1] = INVALID_HW_RING_ID; if (vnic_id == 0) req.flags = cpu_to_le32(VNIC_ALLOC_REQ_FLAGS_DEFAULT); @@ -4261,7 +4273,7 @@ static int bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id) int rc; /* allocate context for vnic */ - rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic_id); + rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic_id, 0); if (rc) { netdev_err(bp->dev, "hwrm vnic %d alloc failure rc: %x\n", vnic_id, rc); @@ -4269,6 +4281,16 @@ static int bnxt_setup_vnic(struct bnxt *bp, u16 vnic_id) } bp->rsscos_nr_ctxs++; + if (BNXT_CHIP_TYPE_NITRO_A0(bp)) { + rc = bnxt_hwrm_vnic_ctx_alloc(bp, vnic_id, 1); + if (rc) { + netdev_err(bp->dev, "hwrm vnic %d cos ctx alloc failure rc: %x\n", + vnic_id, rc); + goto vnic_setup_err; + } + bp->rsscos_nr_ctxs++; + } + /* configure default vnic, ring grp */ rc = bnxt_hwrm_vnic_cfg(bp, vnic_id); if (rc) { diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index e667150a8dba..5307a2ee6a05 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -695,7 +695,8 @@ struct bnxt_ring_grp_info { struct bnxt_vnic_info { u16 fw_vnic_id; /* returned by Chimp during alloc */ - u16 fw_rss_cos_lb_ctx; +#define BNXT_MAX_CTX_PER_VNIC 2 + u16 fw_rss_cos_lb_ctx[BNXT_MAX_CTX_PER_VNIC]; u16 fw_l2_ctx_id; #define BNXT_MAX_UC_ADDRS 4 __le64 fw_l2_filter_id[BNXT_MAX_UC_ADDRS]; -- 2.20.1