Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 555 insertions, 0 deletions

diff --git a/drivers/scsi/snic/snic_io.c b/drivers/scsi/snic/snic_io.c
new file mode 100644
index 000000000..32a77bee4
--- /dev/null
+++ b/drivers/scsi/snic/snic_io.c
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright 2014 Cisco Systems, Inc.  All rights reserved.
+
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/mempool.h>
+#include <scsi/scsi_tcq.h>
+
+#include "snic_io.h"
+#include "snic.h"
+#include "cq_enet_desc.h"
+#include "snic_fwint.h"
+
+static void
+snic_wq_cmpl_frame_send(struct vnic_wq *wq,
+			    struct cq_desc *cq_desc,
+			    struct vnic_wq_buf *buf,
+			    void *opaque)
+{
+	struct snic *snic = svnic_dev_priv(wq->vdev);
+
+	SNIC_BUG_ON(buf->os_buf == NULL);
+
+	if (snic_log_level & SNIC_DESC_LOGGING)
+		SNIC_HOST_INFO(snic->shost,
+			       "Ack received for snic_host_req %p.\n",
+			       buf->os_buf);
+
+	SNIC_TRC(snic->shost->host_no, 0, 0,
+		 ((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
+		 0);
+
+	buf->os_buf = NULL;
+}
+
+static int
+snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
+			  struct cq_desc *cq_desc,
+			  u8 type,
+			  u16 q_num,
+			  u16 cmpl_idx,
+			  void *opaque)
+{
+	struct snic *snic = svnic_dev_priv(vdev);
+	unsigned long flags;
+
+	SNIC_BUG_ON(q_num != 0);
+
+	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
+	svnic_wq_service(&snic->wq[q_num],
+			 cq_desc,
+			 cmpl_idx,
+			 snic_wq_cmpl_frame_send,
+			 NULL);
+	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
+
+	return 0;
+} /* end of snic_cmpl_handler_cont */
+
+int
+snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
+{
+	unsigned int work_done = 0;
+	unsigned int i;
+
+	snic->s_stats.misc.last_ack_time = jiffies;
+	for (i = 0; i < snic->wq_count; i++) {
+		work_done += svnic_cq_service(&snic->cq[i],
+					      work_to_do,
+					      snic_wq_cmpl_handler_cont,
+					      NULL);
+	}
+
+	return work_done;
+} /* end of snic_wq_cmpl_handler */
+
+void
+snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
+{
+
+	struct snic_host_req *req = buf->os_buf;
+	struct snic *snic = svnic_dev_priv(wq->vdev);
+	struct snic_req_info *rqi = NULL;
+	unsigned long flags;
+
+	dma_unmap_single(&snic->pdev->dev, buf->dma_addr, buf->len,
+			 DMA_TO_DEVICE);
+
+	rqi = req_to_rqi(req);
+	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
+	if (list_empty(&rqi->list)) {
+		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+		goto end;
+	}
+
+	SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
+	list_del_init(&rqi->list);
+	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+
+	if (rqi->sge_va) {
+		snic_pci_unmap_rsp_buf(snic, rqi);
+		kfree((void *)rqi->sge_va);
+		rqi->sge_va = 0;
+	}
+	snic_req_free(snic, rqi);
+	SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");
+
+end:
+	return;
+}
+
+/* Criteria to select work queue in multi queue mode */
+static int
+snic_select_wq(struct snic *snic)
+{
+	/* No multi queue support for now */
+	BUILD_BUG_ON(SNIC_WQ_MAX > 1);
+
+	return 0;
+}
+
+static int
+snic_wqdesc_avail(struct snic *snic, int q_num, int req_type)
+{
+	int nr_wqdesc = snic->config.wq_enet_desc_count;
+
+	if (q_num > 0) {
+		/*
+		 * Multi Queue case, additional care is required.
+		 * Per WQ active requests need to be maintained.
+		 */
+		SNIC_HOST_INFO(snic->shost, "desc_avail: Multi Queue case.\n");
+		SNIC_BUG_ON(q_num > 0);
+
+		return -1;
+	}
+
+	nr_wqdesc -= atomic64_read(&snic->s_stats.fw.actv_reqs);
+
+	return ((req_type == SNIC_REQ_HBA_RESET) ? nr_wqdesc : nr_wqdesc - 1);
+}
+
+int
+snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
+{
+	dma_addr_t pa = 0;
+	unsigned long flags;
+	struct snic_fw_stats *fwstats = &snic->s_stats.fw;
+	struct snic_host_req *req = (struct snic_host_req *) os_buf;
+	long act_reqs;
+	long desc_avail = 0;
+	int q_num = 0;
+
+	snic_print_desc(__func__, os_buf, len);
+
+	/* Map request buffer */
+	pa = dma_map_single(&snic->pdev->dev, os_buf, len, DMA_TO_DEVICE);
+	if (dma_mapping_error(&snic->pdev->dev, pa)) {
+		SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");
+
+		return -ENOMEM;
+	}
+
+	req->req_pa = (ulong)pa;
+
+	q_num = snic_select_wq(snic);
+
+	spin_lock_irqsave(&snic->wq_lock[q_num], flags);
+	desc_avail = snic_wqdesc_avail(snic, q_num, req->hdr.type);
+	if (desc_avail <= 0) {
+		dma_unmap_single(&snic->pdev->dev, pa, len, DMA_TO_DEVICE);
+		req->req_pa = 0;
+		spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
+		atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
+		SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
+
+		return -ENOMEM;
+	}
+
+	snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
+	/*
+	 * Update stats
+	 * note: when multi queue enabled, fw actv_reqs should be per queue.
+	 */
+	act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
+	spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
+
+	if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
+		atomic64_set(&fwstats->max_actv_reqs, act_reqs);
+
+	return 0;
+} /* end of snic_queue_wq_desc() */
+
+/*
+ * snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
+ * Purpose : Used during driver unload to clean up the requests.
+ */
+void
+snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
+{
+	unsigned long flags;
+
+	INIT_LIST_HEAD(&rqi->list);
+
+	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
+	list_add_tail(&rqi->list, &snic->spl_cmd_list);
+	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+}
+
+/*
+ * snic_req_init:
+ * Allocates snic_req_info + snic_host_req + sgl data, and initializes.
+ */
+struct snic_req_info *
+snic_req_init(struct snic *snic, int sg_cnt)
+{
+	u8 typ;
+	struct snic_req_info *rqi = NULL;
+
+	typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
+		SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;
+
+	rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
+	if (!rqi) {
+		atomic64_inc(&snic->s_stats.io.alloc_fail);
+		SNIC_HOST_ERR(snic->shost,
+			      "Failed to allocate memory from snic req pool id = %d\n",
+			      typ);
+		return rqi;
+	}
+
+	memset(rqi, 0, sizeof(*rqi));
+	rqi->rq_pool_type = typ;
+	rqi->start_time = jiffies;
+	rqi->req = (struct snic_host_req *) (rqi + 1);
+	rqi->req_len = sizeof(struct snic_host_req);
+	rqi->snic = snic;
+
+	rqi->req = (struct snic_host_req *)(rqi + 1);
+
+	if (sg_cnt == 0)
+		goto end;
+
+	rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));
+
+	if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
+		atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);
+
+	SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
+	atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);
+
+end:
+	memset(rqi->req, 0, rqi->req_len);
+
+	/* pre initialization of init_ctx to support req_to_rqi */
+	rqi->req->hdr.init_ctx = (ulong) rqi;
+
+	SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);
+
+	return rqi;
+} /* end of snic_req_init */
+
+/*
+ * snic_abort_req_init : Inits abort request.
+ */
+struct snic_host_req *
+snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
+{
+	struct snic_host_req *req = NULL;
+
+	SNIC_BUG_ON(!rqi);
+
+	/* If abort to be issued second time, then reuse */
+	if (rqi->abort_req)
+		return rqi->abort_req;
+
+
+	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
+	if (!req) {
+		SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
+		WARN_ON_ONCE(1);
+
+		return NULL;
+	}
+
+	rqi->abort_req = req;
+	memset(req, 0, sizeof(struct snic_host_req));
+	/* pre initialization of init_ctx to support req_to_rqi */
+	req->hdr.init_ctx = (ulong) rqi;
+
+	return req;
+} /* end of snic_abort_req_init */
+
+/*
+ * snic_dr_req_init : Inits device reset req
+ */
+struct snic_host_req *
+snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
+{
+	struct snic_host_req *req = NULL;
+
+	SNIC_BUG_ON(!rqi);
+
+	req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
+	if (!req) {
+		SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
+		WARN_ON_ONCE(1);
+
+		return NULL;
+	}
+
+	SNIC_BUG_ON(rqi->dr_req != NULL);
+	rqi->dr_req = req;
+	memset(req, 0, sizeof(struct snic_host_req));
+	/* pre initialization of init_ctx to support req_to_rqi */
+	req->hdr.init_ctx = (ulong) rqi;
+
+	return req;
+} /* end of snic_dr_req_init */
+
+/* frees snic_req_info and snic_host_req */
+void
+snic_req_free(struct snic *snic, struct snic_req_info *rqi)
+{
+	SNIC_BUG_ON(rqi->req == rqi->abort_req);
+	SNIC_BUG_ON(rqi->req == rqi->dr_req);
+	SNIC_BUG_ON(rqi->sge_va != 0);
+
+	SNIC_SCSI_DBG(snic->shost,
+		      "Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
+		      rqi, rqi->req, rqi->abort_req, rqi->dr_req);
+
+	if (rqi->abort_req) {
+		if (rqi->abort_req->req_pa)
+			dma_unmap_single(&snic->pdev->dev,
+					 rqi->abort_req->req_pa,
+					 sizeof(struct snic_host_req),
+					 DMA_TO_DEVICE);
+
+		mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
+	}
+
+	if (rqi->dr_req) {
+		if (rqi->dr_req->req_pa)
+			dma_unmap_single(&snic->pdev->dev,
+					 rqi->dr_req->req_pa,
+					 sizeof(struct snic_host_req),
+					 DMA_TO_DEVICE);
+
+		mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
+	}
+
+	if (rqi->req->req_pa)
+		dma_unmap_single(&snic->pdev->dev,
+				 rqi->req->req_pa,
+				 rqi->req_len,
+				 DMA_TO_DEVICE);
+
+	mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
+}
+
+void
+snic_pci_unmap_rsp_buf(struct snic *snic, struct snic_req_info *rqi)
+{
+	struct snic_sg_desc *sgd;
+
+	sgd = req_to_sgl(rqi_to_req(rqi));
+	SNIC_BUG_ON(sgd[0].addr == 0);
+	dma_unmap_single(&snic->pdev->dev,
+			 le64_to_cpu(sgd[0].addr),
+			 le32_to_cpu(sgd[0].len),
+			 DMA_FROM_DEVICE);
+}
+
+/*
+ * snic_free_all_untagged_reqs: Walks through untagged reqs and frees them.
+ */
+void
+snic_free_all_untagged_reqs(struct snic *snic)
+{
+	struct snic_req_info *rqi;
+	struct list_head *cur, *nxt;
+	unsigned long flags;
+
+	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
+	list_for_each_safe(cur, nxt, &snic->spl_cmd_list) {
+		rqi = list_entry(cur, struct snic_req_info, list);
+		list_del_init(&rqi->list);
+		if (rqi->sge_va) {
+			snic_pci_unmap_rsp_buf(snic, rqi);
+			kfree((void *)rqi->sge_va);
+			rqi->sge_va = 0;
+		}
+
+		snic_req_free(snic, rqi);
+	}
+	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+}
+
+/*
+ * snic_release_untagged_req : Unlinks the untagged req and frees it.
+ */
+void
+snic_release_untagged_req(struct snic *snic, struct snic_req_info *rqi)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&snic->snic_lock, flags);
+	if (snic->in_remove) {
+		spin_unlock_irqrestore(&snic->snic_lock, flags);
+		goto end;
+	}
+	spin_unlock_irqrestore(&snic->snic_lock, flags);
+
+	spin_lock_irqsave(&snic->spl_cmd_lock, flags);
+	if (list_empty(&rqi->list)) {
+		spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+		goto end;
+	}
+	list_del_init(&rqi->list);
+	spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
+	snic_req_free(snic, rqi);
+
+end:
+	return;
+}
+
+/* dump buf in hex fmt */
+void
+snic_hex_dump(char *pfx, char *data, int len)
+{
+	SNIC_INFO("%s Dumping Data of Len = %d\n", pfx, len);
+	print_hex_dump_bytes(pfx, DUMP_PREFIX_NONE, data, len);
+}
+
+#define	LINE_BUFSZ	128	/* for snic_print_desc fn */
+static void
+snic_dump_desc(const char *fn, char *os_buf, int len)
+{
+	struct snic_host_req *req = (struct snic_host_req *) os_buf;
+	struct snic_fw_req *fwreq = (struct snic_fw_req *) os_buf;
+	struct snic_req_info *rqi = NULL;
+	char line[LINE_BUFSZ] = { '\0' };
+	char *cmd_str = NULL;
+
+	if (req->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL)
+		rqi = (struct snic_req_info *) fwreq->hdr.init_ctx;
+	else
+		rqi = (struct snic_req_info *) req->hdr.init_ctx;
+
+	SNIC_BUG_ON(rqi == NULL || rqi->req == NULL);
+	switch (req->hdr.type) {
+	case SNIC_REQ_REPORT_TGTS:
+		cmd_str = "report-tgt : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_REQ_REPORT_TGTS :");
+		break;
+
+	case SNIC_REQ_ICMND:
+		cmd_str = "icmnd : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ICMND : 0x%x :",
+			 req->u.icmnd.cdb[0]);
+		break;
+
+	case SNIC_REQ_ITMF:
+		cmd_str = "itmf : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_REQ_ITMF :");
+		break;
+
+	case SNIC_REQ_HBA_RESET:
+		cmd_str = "hba reset :";
+		snprintf(line, LINE_BUFSZ, "SNIC_REQ_HBA_RESET :");
+		break;
+
+	case SNIC_REQ_EXCH_VER:
+		cmd_str = "exch ver : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_REQ_EXCH_VER :");
+		break;
+
+	case SNIC_REQ_TGT_INFO:
+		cmd_str = "tgt info : ";
+		break;
+
+	case SNIC_RSP_REPORT_TGTS_CMPL:
+		cmd_str = "report tgt cmpl : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_RSP_REPORT_TGTS_CMPL :");
+		break;
+
+	case SNIC_RSP_ICMND_CMPL:
+		cmd_str = "icmnd_cmpl : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ICMND_CMPL : 0x%x :",
+			 rqi->req->u.icmnd.cdb[0]);
+		break;
+
+	case SNIC_RSP_ITMF_CMPL:
+		cmd_str = "itmf_cmpl : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_RSP_ITMF_CMPL :");
+		break;
+
+	case SNIC_RSP_HBA_RESET_CMPL:
+		cmd_str = "hba_reset_cmpl : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_RSP_HBA_RESET_CMPL :");
+		break;
+
+	case SNIC_RSP_EXCH_VER_CMPL:
+		cmd_str = "exch_ver_cmpl : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_RSP_EXCH_VER_CMPL :");
+		break;
+
+	case SNIC_MSG_ACK:
+		cmd_str = "msg ack : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ACK :");
+		break;
+
+	case SNIC_MSG_ASYNC_EVNOTIFY:
+		cmd_str = "async notify : ";
+		snprintf(line, LINE_BUFSZ, "SNIC_MSG_ASYNC_EVNOTIFY :");
+		break;
+
+	default:
+		cmd_str = "unknown : ";
+		SNIC_BUG_ON(1);
+		break;
+	}
+
+	SNIC_INFO("%s:%s >>cmndid=%x:sg_cnt = %x:status = %x:ctx = %lx.\n",
+		  fn, line, req->hdr.cmnd_id, req->hdr.sg_cnt, req->hdr.status,
+		  req->hdr.init_ctx);
+
+	/* Enable it, to dump byte stream */
+	if (snic_log_level & 0x20)
+		snic_hex_dump(cmd_str, os_buf, len);
+} /* end of __snic_print_desc */
+
+void
+snic_print_desc(const char *fn, char *os_buf, int len)
+{
+	if (snic_log_level & SNIC_DESC_LOGGING)
+		snic_dump_desc(fn, os_buf, len);
+}
+
+void
+snic_calc_io_process_time(struct snic *snic, struct snic_req_info *rqi)
+{
+	u64 duration;
+
+	duration = jiffies - rqi->start_time;
+
+	if (duration > atomic64_read(&snic->s_stats.io.max_time))
+		atomic64_set(&snic->s_stats.io.max_time, duration);
+}