![Varun Prakash](/assets/img/avatar_default.png)
Firmware does tx flow control so remove tx flow control code from the driver. Signed-off-by: Varun Prakash <varun@chelsio.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
1623 lines
40 KiB
C
1623 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2016 Chelsio Communications, Inc.
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*/
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <linux/sched/signal.h>
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#include <asm/unaligned.h>
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#include <net/tcp.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "cxgbit.h"
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struct sge_opaque_hdr {
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void *dev;
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dma_addr_t addr[MAX_SKB_FRAGS + 1];
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};
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static const u8 cxgbit_digest_len[] = {0, 4, 4, 8};
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#define TX_HDR_LEN (sizeof(struct sge_opaque_hdr) + \
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sizeof(struct fw_ofld_tx_data_wr))
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static struct sk_buff *
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__cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len, bool iso)
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{
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struct sk_buff *skb = NULL;
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u8 submode = 0;
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int errcode;
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static const u32 hdr_len = TX_HDR_LEN + ISCSI_HDR_LEN;
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if (len) {
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skb = alloc_skb_with_frags(hdr_len, len,
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0, &errcode,
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GFP_KERNEL);
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if (!skb)
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return NULL;
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skb_reserve(skb, TX_HDR_LEN);
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skb_reset_transport_header(skb);
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__skb_put(skb, ISCSI_HDR_LEN);
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skb->data_len = len;
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skb->len += len;
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submode |= (csk->submode & CXGBIT_SUBMODE_DCRC);
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} else {
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u32 iso_len = iso ? sizeof(struct cpl_tx_data_iso) : 0;
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skb = alloc_skb(hdr_len + iso_len, GFP_KERNEL);
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if (!skb)
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return NULL;
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skb_reserve(skb, TX_HDR_LEN + iso_len);
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skb_reset_transport_header(skb);
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__skb_put(skb, ISCSI_HDR_LEN);
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}
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submode |= (csk->submode & CXGBIT_SUBMODE_HCRC);
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cxgbit_skcb_submode(skb) = submode;
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cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[submode];
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cxgbit_skcb_flags(skb) |= SKCBF_TX_NEED_HDR;
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return skb;
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}
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static struct sk_buff *cxgbit_alloc_skb(struct cxgbit_sock *csk, u32 len)
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{
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return __cxgbit_alloc_skb(csk, len, false);
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}
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/*
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* cxgbit_is_ofld_imm - check whether a packet can be sent as immediate data
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* @skb: the packet
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*
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* Returns true if a packet can be sent as an offload WR with immediate
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* data. We currently use the same limit as for Ethernet packets.
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*/
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static int cxgbit_is_ofld_imm(const struct sk_buff *skb)
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{
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int length = skb->len;
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if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
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length += sizeof(struct fw_ofld_tx_data_wr);
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if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_ISO))
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length += sizeof(struct cpl_tx_data_iso);
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#define MAX_IMM_TX_PKT_LEN 256
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return length <= MAX_IMM_TX_PKT_LEN;
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}
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/*
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* cxgbit_sgl_len - calculates the size of an SGL of the given capacity
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* @n: the number of SGL entries
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* Calculates the number of flits needed for a scatter/gather list that
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* can hold the given number of entries.
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*/
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static inline unsigned int cxgbit_sgl_len(unsigned int n)
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{
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n--;
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return (3 * n) / 2 + (n & 1) + 2;
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}
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/*
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* cxgbit_calc_tx_flits_ofld - calculate # of flits for an offload packet
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* @skb: the packet
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*
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* Returns the number of flits needed for the given offload packet.
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* These packets are already fully constructed and no additional headers
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* will be added.
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*/
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static unsigned int cxgbit_calc_tx_flits_ofld(const struct sk_buff *skb)
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{
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unsigned int flits, cnt;
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if (cxgbit_is_ofld_imm(skb))
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return DIV_ROUND_UP(skb->len, 8);
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flits = skb_transport_offset(skb) / 8;
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cnt = skb_shinfo(skb)->nr_frags;
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if (skb_tail_pointer(skb) != skb_transport_header(skb))
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cnt++;
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return flits + cxgbit_sgl_len(cnt);
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}
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#define CXGBIT_ISO_FSLICE 0x1
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#define CXGBIT_ISO_LSLICE 0x2
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static void
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cxgbit_cpl_tx_data_iso(struct sk_buff *skb, struct cxgbit_iso_info *iso_info)
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{
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struct cpl_tx_data_iso *cpl;
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unsigned int submode = cxgbit_skcb_submode(skb);
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unsigned int fslice = !!(iso_info->flags & CXGBIT_ISO_FSLICE);
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unsigned int lslice = !!(iso_info->flags & CXGBIT_ISO_LSLICE);
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cpl = __skb_push(skb, sizeof(*cpl));
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cpl->op_to_scsi = htonl(CPL_TX_DATA_ISO_OP_V(CPL_TX_DATA_ISO) |
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CPL_TX_DATA_ISO_FIRST_V(fslice) |
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CPL_TX_DATA_ISO_LAST_V(lslice) |
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CPL_TX_DATA_ISO_CPLHDRLEN_V(0) |
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CPL_TX_DATA_ISO_HDRCRC_V(submode & 1) |
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CPL_TX_DATA_ISO_PLDCRC_V(((submode >> 1) & 1)) |
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CPL_TX_DATA_ISO_IMMEDIATE_V(0) |
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CPL_TX_DATA_ISO_SCSI_V(2));
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cpl->ahs_len = 0;
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cpl->mpdu = htons(DIV_ROUND_UP(iso_info->mpdu, 4));
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cpl->burst_size = htonl(DIV_ROUND_UP(iso_info->burst_len, 4));
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cpl->len = htonl(iso_info->len);
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cpl->reserved2_seglen_offset = htonl(0);
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cpl->datasn_offset = htonl(0);
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cpl->buffer_offset = htonl(0);
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cpl->reserved3 = 0;
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__skb_pull(skb, sizeof(*cpl));
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}
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static void
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cxgbit_tx_data_wr(struct cxgbit_sock *csk, struct sk_buff *skb, u32 dlen,
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u32 len, u32 credits, u32 compl)
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{
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struct fw_ofld_tx_data_wr *req;
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const struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
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u32 submode = cxgbit_skcb_submode(skb);
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u32 wr_ulp_mode = 0;
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u32 hdr_size = sizeof(*req);
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u32 opcode = FW_OFLD_TX_DATA_WR;
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u32 immlen = 0;
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u32 force = is_t5(lldi->adapter_type) ? TX_FORCE_V(!submode) :
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T6_TX_FORCE_F;
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if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO) {
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opcode = FW_ISCSI_TX_DATA_WR;
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immlen += sizeof(struct cpl_tx_data_iso);
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hdr_size += sizeof(struct cpl_tx_data_iso);
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submode |= 8;
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}
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if (cxgbit_is_ofld_imm(skb))
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immlen += dlen;
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req = __skb_push(skb, hdr_size);
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req->op_to_immdlen = cpu_to_be32(FW_WR_OP_V(opcode) |
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FW_WR_COMPL_V(compl) |
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FW_WR_IMMDLEN_V(immlen));
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req->flowid_len16 = cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
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FW_WR_LEN16_V(credits));
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req->plen = htonl(len);
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wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP_MODE_ISCSI) |
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FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
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req->tunnel_to_proxy = htonl((wr_ulp_mode) | force |
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FW_OFLD_TX_DATA_WR_SHOVE_V(skb_peek(&csk->txq) ? 0 : 1));
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}
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static void cxgbit_arp_failure_skb_discard(void *handle, struct sk_buff *skb)
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{
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kfree_skb(skb);
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}
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void cxgbit_push_tx_frames(struct cxgbit_sock *csk)
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{
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struct sk_buff *skb;
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while (csk->wr_cred && ((skb = skb_peek(&csk->txq)) != NULL)) {
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u32 dlen = skb->len;
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u32 len = skb->len;
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u32 credits_needed;
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u32 compl = 0;
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u32 flowclen16 = 0;
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u32 iso_cpl_len = 0;
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if (cxgbit_skcb_flags(skb) & SKCBF_TX_ISO)
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iso_cpl_len = sizeof(struct cpl_tx_data_iso);
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if (cxgbit_is_ofld_imm(skb))
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credits_needed = DIV_ROUND_UP(dlen + iso_cpl_len, 16);
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else
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credits_needed = DIV_ROUND_UP((8 *
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cxgbit_calc_tx_flits_ofld(skb)) +
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iso_cpl_len, 16);
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if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR))
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credits_needed += DIV_ROUND_UP(
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sizeof(struct fw_ofld_tx_data_wr), 16);
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/*
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* Assumes the initial credits is large enough to support
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* fw_flowc_wr plus largest possible first payload
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*/
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if (!test_and_set_bit(CSK_TX_DATA_SENT, &csk->com.flags)) {
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flowclen16 = cxgbit_send_tx_flowc_wr(csk);
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csk->wr_cred -= flowclen16;
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csk->wr_una_cred += flowclen16;
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}
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if (csk->wr_cred < credits_needed) {
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pr_debug("csk 0x%p, skb %u/%u, wr %d < %u.\n",
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csk, skb->len, skb->data_len,
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credits_needed, csk->wr_cred);
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break;
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}
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__skb_unlink(skb, &csk->txq);
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set_wr_txq(skb, CPL_PRIORITY_DATA, csk->txq_idx);
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skb->csum = (__force __wsum)(credits_needed + flowclen16);
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csk->wr_cred -= credits_needed;
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csk->wr_una_cred += credits_needed;
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pr_debug("csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
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csk, skb->len, skb->data_len, credits_needed,
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csk->wr_cred, csk->wr_una_cred);
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if (likely(cxgbit_skcb_flags(skb) & SKCBF_TX_NEED_HDR)) {
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len += cxgbit_skcb_tx_extralen(skb);
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if ((csk->wr_una_cred >= (csk->wr_max_cred / 2)) ||
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(!before(csk->write_seq,
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csk->snd_una + csk->snd_win))) {
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compl = 1;
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csk->wr_una_cred = 0;
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}
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cxgbit_tx_data_wr(csk, skb, dlen, len, credits_needed,
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compl);
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csk->snd_nxt += len;
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} else if ((cxgbit_skcb_flags(skb) & SKCBF_TX_FLAG_COMPL) ||
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(csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
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struct cpl_close_con_req *req =
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(struct cpl_close_con_req *)skb->data;
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req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
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csk->wr_una_cred = 0;
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}
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cxgbit_sock_enqueue_wr(csk, skb);
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t4_set_arp_err_handler(skb, csk,
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cxgbit_arp_failure_skb_discard);
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pr_debug("csk 0x%p,%u, skb 0x%p, %u.\n",
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csk, csk->tid, skb, len);
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cxgbit_l2t_send(csk->com.cdev, skb, csk->l2t);
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}
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}
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static void cxgbit_unlock_sock(struct cxgbit_sock *csk)
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{
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struct sk_buff_head backlogq;
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struct sk_buff *skb;
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void (*fn)(struct cxgbit_sock *, struct sk_buff *);
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skb_queue_head_init(&backlogq);
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spin_lock_bh(&csk->lock);
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while (skb_queue_len(&csk->backlogq)) {
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skb_queue_splice_init(&csk->backlogq, &backlogq);
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spin_unlock_bh(&csk->lock);
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while ((skb = __skb_dequeue(&backlogq))) {
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fn = cxgbit_skcb_rx_backlog_fn(skb);
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fn(csk, skb);
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}
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spin_lock_bh(&csk->lock);
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}
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csk->lock_owner = false;
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spin_unlock_bh(&csk->lock);
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}
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static int cxgbit_queue_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
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{
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int ret = 0;
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spin_lock_bh(&csk->lock);
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csk->lock_owner = true;
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spin_unlock_bh(&csk->lock);
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if (unlikely((csk->com.state != CSK_STATE_ESTABLISHED) ||
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signal_pending(current))) {
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__kfree_skb(skb);
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__skb_queue_purge(&csk->ppodq);
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ret = -1;
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goto unlock;
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}
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csk->write_seq += skb->len +
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cxgbit_skcb_tx_extralen(skb);
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skb_queue_splice_tail_init(&csk->ppodq, &csk->txq);
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__skb_queue_tail(&csk->txq, skb);
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cxgbit_push_tx_frames(csk);
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unlock:
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cxgbit_unlock_sock(csk);
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return ret;
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}
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static int
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cxgbit_map_skb(struct iscsi_cmd *cmd, struct sk_buff *skb, u32 data_offset,
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u32 data_length)
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{
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u32 i = 0, nr_frags = MAX_SKB_FRAGS;
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u32 padding = ((-data_length) & 3);
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struct scatterlist *sg;
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struct page *page;
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unsigned int page_off;
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if (padding)
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nr_frags--;
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/*
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* We know each entry in t_data_sg contains a page.
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*/
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sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
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page_off = (data_offset % PAGE_SIZE);
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while (data_length && (i < nr_frags)) {
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u32 cur_len = min_t(u32, data_length, sg->length - page_off);
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page = sg_page(sg);
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get_page(page);
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skb_fill_page_desc(skb, i, page, sg->offset + page_off,
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cur_len);
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skb->data_len += cur_len;
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skb->len += cur_len;
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skb->truesize += cur_len;
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data_length -= cur_len;
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page_off = 0;
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sg = sg_next(sg);
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i++;
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}
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if (data_length)
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return -1;
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if (padding) {
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page = alloc_page(GFP_KERNEL | __GFP_ZERO);
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if (!page)
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return -1;
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skb_fill_page_desc(skb, i, page, 0, padding);
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skb->data_len += padding;
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skb->len += padding;
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skb->truesize += padding;
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}
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return 0;
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}
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static int
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cxgbit_tx_datain_iso(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
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struct iscsi_datain_req *dr)
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{
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struct iscsi_conn *conn = csk->conn;
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struct sk_buff *skb;
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struct iscsi_datain datain;
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struct cxgbit_iso_info iso_info;
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u32 data_length = cmd->se_cmd.data_length;
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u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
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u32 num_pdu, plen, tx_data = 0;
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bool task_sense = !!(cmd->se_cmd.se_cmd_flags &
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SCF_TRANSPORT_TASK_SENSE);
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bool set_statsn = false;
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int ret = -1;
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while (data_length) {
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num_pdu = (data_length + mrdsl - 1) / mrdsl;
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if (num_pdu > csk->max_iso_npdu)
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num_pdu = csk->max_iso_npdu;
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plen = num_pdu * mrdsl;
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if (plen > data_length)
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plen = data_length;
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skb = __cxgbit_alloc_skb(csk, 0, true);
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if (unlikely(!skb))
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return -ENOMEM;
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memset(skb->data, 0, ISCSI_HDR_LEN);
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cxgbit_skcb_flags(skb) |= SKCBF_TX_ISO;
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cxgbit_skcb_submode(skb) |= (csk->submode &
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CXGBIT_SUBMODE_DCRC);
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cxgbit_skcb_tx_extralen(skb) = (num_pdu *
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cxgbit_digest_len[cxgbit_skcb_submode(skb)]) +
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((num_pdu - 1) * ISCSI_HDR_LEN);
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memset(&datain, 0, sizeof(struct iscsi_datain));
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memset(&iso_info, 0, sizeof(iso_info));
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if (!tx_data)
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iso_info.flags |= CXGBIT_ISO_FSLICE;
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if (!(data_length - plen)) {
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iso_info.flags |= CXGBIT_ISO_LSLICE;
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if (!task_sense) {
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datain.flags = ISCSI_FLAG_DATA_STATUS;
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iscsit_increment_maxcmdsn(cmd, conn->sess);
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cmd->stat_sn = conn->stat_sn++;
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set_statsn = true;
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}
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}
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iso_info.burst_len = num_pdu * mrdsl;
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iso_info.mpdu = mrdsl;
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iso_info.len = ISCSI_HDR_LEN + plen;
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cxgbit_cpl_tx_data_iso(skb, &iso_info);
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datain.offset = tx_data;
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datain.data_sn = cmd->data_sn - 1;
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|
|
iscsit_build_datain_pdu(cmd, conn, &datain,
|
|
(struct iscsi_data_rsp *)skb->data,
|
|
set_statsn);
|
|
|
|
ret = cxgbit_map_skb(cmd, skb, tx_data, plen);
|
|
if (unlikely(ret)) {
|
|
__kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
ret = cxgbit_queue_skb(csk, skb);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
tx_data += plen;
|
|
data_length -= plen;
|
|
|
|
cmd->read_data_done += plen;
|
|
cmd->data_sn += num_pdu;
|
|
}
|
|
|
|
dr->dr_complete = DATAIN_COMPLETE_NORMAL;
|
|
|
|
return 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cxgbit_tx_datain(struct cxgbit_sock *csk, struct iscsi_cmd *cmd,
|
|
const struct iscsi_datain *datain)
|
|
{
|
|
struct sk_buff *skb;
|
|
int ret = 0;
|
|
|
|
skb = cxgbit_alloc_skb(csk, 0);
|
|
if (unlikely(!skb))
|
|
return -ENOMEM;
|
|
|
|
memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
|
|
|
|
if (datain->length) {
|
|
cxgbit_skcb_submode(skb) |= (csk->submode &
|
|
CXGBIT_SUBMODE_DCRC);
|
|
cxgbit_skcb_tx_extralen(skb) =
|
|
cxgbit_digest_len[cxgbit_skcb_submode(skb)];
|
|
}
|
|
|
|
ret = cxgbit_map_skb(cmd, skb, datain->offset, datain->length);
|
|
if (ret < 0) {
|
|
__kfree_skb(skb);
|
|
return ret;
|
|
}
|
|
|
|
return cxgbit_queue_skb(csk, skb);
|
|
}
|
|
|
|
static int
|
|
cxgbit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
|
|
struct iscsi_datain_req *dr,
|
|
const struct iscsi_datain *datain)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
u32 data_length = cmd->se_cmd.data_length;
|
|
u32 padding = ((-data_length) & 3);
|
|
u32 mrdsl = conn->conn_ops->MaxRecvDataSegmentLength;
|
|
|
|
if ((data_length > mrdsl) && (!dr->recovery) &&
|
|
(!padding) && (!datain->offset) && csk->max_iso_npdu) {
|
|
atomic_long_add(data_length - datain->length,
|
|
&conn->sess->tx_data_octets);
|
|
return cxgbit_tx_datain_iso(csk, cmd, dr);
|
|
}
|
|
|
|
return cxgbit_tx_datain(csk, cmd, datain);
|
|
}
|
|
|
|
static int
|
|
cxgbit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
|
|
const void *data_buf, u32 data_buf_len)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
struct sk_buff *skb;
|
|
u32 padding = ((-data_buf_len) & 3);
|
|
|
|
skb = cxgbit_alloc_skb(csk, data_buf_len + padding);
|
|
if (unlikely(!skb))
|
|
return -ENOMEM;
|
|
|
|
memcpy(skb->data, cmd->pdu, ISCSI_HDR_LEN);
|
|
|
|
if (data_buf_len) {
|
|
u32 pad_bytes = 0;
|
|
|
|
skb_store_bits(skb, ISCSI_HDR_LEN, data_buf, data_buf_len);
|
|
|
|
if (padding)
|
|
skb_store_bits(skb, ISCSI_HDR_LEN + data_buf_len,
|
|
&pad_bytes, padding);
|
|
}
|
|
|
|
cxgbit_skcb_tx_extralen(skb) = cxgbit_digest_len[
|
|
cxgbit_skcb_submode(skb)];
|
|
|
|
return cxgbit_queue_skb(csk, skb);
|
|
}
|
|
|
|
int
|
|
cxgbit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
|
|
struct iscsi_datain_req *dr, const void *buf, u32 buf_len)
|
|
{
|
|
if (dr)
|
|
return cxgbit_xmit_datain_pdu(conn, cmd, dr, buf);
|
|
else
|
|
return cxgbit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
|
|
}
|
|
|
|
int cxgbit_validate_params(struct iscsi_conn *conn)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
struct cxgbit_device *cdev = csk->com.cdev;
|
|
struct iscsi_param *param;
|
|
u32 max_xmitdsl;
|
|
|
|
param = iscsi_find_param_from_key(MAXXMITDATASEGMENTLENGTH,
|
|
conn->param_list);
|
|
if (!param)
|
|
return -1;
|
|
|
|
if (kstrtou32(param->value, 0, &max_xmitdsl) < 0)
|
|
return -1;
|
|
|
|
if (max_xmitdsl > cdev->mdsl) {
|
|
if (iscsi_change_param_sprintf(
|
|
conn, "MaxXmitDataSegmentLength=%u", cdev->mdsl))
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cxgbit_set_digest(struct cxgbit_sock *csk)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_param *param;
|
|
|
|
param = iscsi_find_param_from_key(HEADERDIGEST, conn->param_list);
|
|
if (!param) {
|
|
pr_err("param not found key %s\n", HEADERDIGEST);
|
|
return -1;
|
|
}
|
|
|
|
if (!strcmp(param->value, CRC32C))
|
|
csk->submode |= CXGBIT_SUBMODE_HCRC;
|
|
|
|
param = iscsi_find_param_from_key(DATADIGEST, conn->param_list);
|
|
if (!param) {
|
|
csk->submode = 0;
|
|
pr_err("param not found key %s\n", DATADIGEST);
|
|
return -1;
|
|
}
|
|
|
|
if (!strcmp(param->value, CRC32C))
|
|
csk->submode |= CXGBIT_SUBMODE_DCRC;
|
|
|
|
if (cxgbit_setup_conn_digest(csk)) {
|
|
csk->submode = 0;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cxgbit_set_iso_npdu(struct cxgbit_sock *csk)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_conn_ops *conn_ops = conn->conn_ops;
|
|
struct iscsi_param *param;
|
|
u32 mrdsl, mbl;
|
|
u32 max_npdu, max_iso_npdu;
|
|
u32 max_iso_payload;
|
|
|
|
if (conn->login->leading_connection) {
|
|
param = iscsi_find_param_from_key(MAXBURSTLENGTH,
|
|
conn->param_list);
|
|
if (!param) {
|
|
pr_err("param not found key %s\n", MAXBURSTLENGTH);
|
|
return -1;
|
|
}
|
|
|
|
if (kstrtou32(param->value, 0, &mbl) < 0)
|
|
return -1;
|
|
} else {
|
|
mbl = conn->sess->sess_ops->MaxBurstLength;
|
|
}
|
|
|
|
mrdsl = conn_ops->MaxRecvDataSegmentLength;
|
|
max_npdu = mbl / mrdsl;
|
|
|
|
max_iso_payload = rounddown(CXGBIT_MAX_ISO_PAYLOAD, csk->emss);
|
|
|
|
max_iso_npdu = max_iso_payload /
|
|
(ISCSI_HDR_LEN + mrdsl +
|
|
cxgbit_digest_len[csk->submode]);
|
|
|
|
csk->max_iso_npdu = min(max_npdu, max_iso_npdu);
|
|
|
|
if (csk->max_iso_npdu <= 1)
|
|
csk->max_iso_npdu = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* cxgbit_seq_pdu_inorder()
|
|
* @csk: pointer to cxgbit socket structure
|
|
*
|
|
* This function checks whether data sequence and data
|
|
* pdu are in order.
|
|
*
|
|
* Return: returns -1 on error, 0 if data sequence and
|
|
* data pdu are in order, 1 if data sequence or data pdu
|
|
* is not in order.
|
|
*/
|
|
static int cxgbit_seq_pdu_inorder(struct cxgbit_sock *csk)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_param *param;
|
|
|
|
if (conn->login->leading_connection) {
|
|
param = iscsi_find_param_from_key(DATASEQUENCEINORDER,
|
|
conn->param_list);
|
|
if (!param) {
|
|
pr_err("param not found key %s\n", DATASEQUENCEINORDER);
|
|
return -1;
|
|
}
|
|
|
|
if (strcmp(param->value, YES))
|
|
return 1;
|
|
|
|
param = iscsi_find_param_from_key(DATAPDUINORDER,
|
|
conn->param_list);
|
|
if (!param) {
|
|
pr_err("param not found key %s\n", DATAPDUINORDER);
|
|
return -1;
|
|
}
|
|
|
|
if (strcmp(param->value, YES))
|
|
return 1;
|
|
|
|
} else {
|
|
if (!conn->sess->sess_ops->DataSequenceInOrder)
|
|
return 1;
|
|
if (!conn->sess->sess_ops->DataPDUInOrder)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cxgbit_set_params(struct iscsi_conn *conn)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
struct cxgbit_device *cdev = csk->com.cdev;
|
|
struct cxgbi_ppm *ppm = *csk->com.cdev->lldi.iscsi_ppm;
|
|
struct iscsi_conn_ops *conn_ops = conn->conn_ops;
|
|
struct iscsi_param *param;
|
|
u8 erl;
|
|
|
|
if (conn_ops->MaxRecvDataSegmentLength > cdev->mdsl)
|
|
conn_ops->MaxRecvDataSegmentLength = cdev->mdsl;
|
|
|
|
if (cxgbit_set_digest(csk))
|
|
return -1;
|
|
|
|
if (conn->login->leading_connection) {
|
|
param = iscsi_find_param_from_key(ERRORRECOVERYLEVEL,
|
|
conn->param_list);
|
|
if (!param) {
|
|
pr_err("param not found key %s\n", ERRORRECOVERYLEVEL);
|
|
return -1;
|
|
}
|
|
if (kstrtou8(param->value, 0, &erl) < 0)
|
|
return -1;
|
|
} else {
|
|
erl = conn->sess->sess_ops->ErrorRecoveryLevel;
|
|
}
|
|
|
|
if (!erl) {
|
|
int ret;
|
|
|
|
ret = cxgbit_seq_pdu_inorder(csk);
|
|
if (ret < 0) {
|
|
return -1;
|
|
} else if (ret > 0) {
|
|
if (is_t5(cdev->lldi.adapter_type))
|
|
goto enable_ddp;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
if (test_bit(CDEV_ISO_ENABLE, &cdev->flags)) {
|
|
if (cxgbit_set_iso_npdu(csk))
|
|
return -1;
|
|
}
|
|
|
|
enable_ddp:
|
|
if (test_bit(CDEV_DDP_ENABLE, &cdev->flags)) {
|
|
if (cxgbit_setup_conn_pgidx(csk,
|
|
ppm->tformat.pgsz_idx_dflt))
|
|
return -1;
|
|
set_bit(CSK_DDP_ENABLE, &csk->com.flags);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
cxgbit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
|
|
u32 length)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
struct sk_buff *skb;
|
|
u32 padding_buf = 0;
|
|
u8 padding = ((-length) & 3);
|
|
|
|
skb = cxgbit_alloc_skb(csk, length + padding);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
skb_store_bits(skb, 0, login->rsp, ISCSI_HDR_LEN);
|
|
skb_store_bits(skb, ISCSI_HDR_LEN, login->rsp_buf, length);
|
|
|
|
if (padding)
|
|
skb_store_bits(skb, ISCSI_HDR_LEN + length,
|
|
&padding_buf, padding);
|
|
|
|
if (login->login_complete) {
|
|
if (cxgbit_set_params(conn)) {
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
set_bit(CSK_LOGIN_DONE, &csk->com.flags);
|
|
}
|
|
|
|
if (cxgbit_queue_skb(csk, skb))
|
|
return -1;
|
|
|
|
if ((!login->login_complete) && (!login->login_failed))
|
|
schedule_delayed_work(&conn->login_work, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cxgbit_skb_copy_to_sg(struct sk_buff *skb, struct scatterlist *sg,
|
|
unsigned int nents, u32 skip)
|
|
{
|
|
struct skb_seq_state st;
|
|
const u8 *buf;
|
|
unsigned int consumed = 0, buf_len;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(skb);
|
|
|
|
skb_prepare_seq_read(skb, pdu_cb->doffset,
|
|
pdu_cb->doffset + pdu_cb->dlen,
|
|
&st);
|
|
|
|
while (true) {
|
|
buf_len = skb_seq_read(consumed, &buf, &st);
|
|
if (!buf_len) {
|
|
skb_abort_seq_read(&st);
|
|
break;
|
|
}
|
|
|
|
consumed += sg_pcopy_from_buffer(sg, nents, (void *)buf,
|
|
buf_len, skip + consumed);
|
|
}
|
|
}
|
|
|
|
static struct iscsi_cmd *cxgbit_allocate_cmd(struct cxgbit_sock *csk)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct cxgbi_ppm *ppm = cdev2ppm(csk->com.cdev);
|
|
struct cxgbit_cmd *ccmd;
|
|
struct iscsi_cmd *cmd;
|
|
|
|
cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
|
|
if (!cmd) {
|
|
pr_err("Unable to allocate iscsi_cmd + cxgbit_cmd\n");
|
|
return NULL;
|
|
}
|
|
|
|
ccmd = iscsit_priv_cmd(cmd);
|
|
ccmd->ttinfo.tag = ppm->tformat.no_ddp_mask;
|
|
ccmd->setup_ddp = true;
|
|
|
|
return cmd;
|
|
}
|
|
|
|
static int
|
|
cxgbit_handle_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
|
|
u32 length)
|
|
{
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
struct cxgbit_sock *csk = conn->context;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
|
|
pr_err("ImmediateData CRC32C DataDigest error\n");
|
|
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
|
|
pr_err("Unable to recover from"
|
|
" Immediate Data digest failure while"
|
|
" in ERL=0.\n");
|
|
iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
|
|
(unsigned char *)hdr);
|
|
return IMMEDIATE_DATA_CANNOT_RECOVER;
|
|
}
|
|
|
|
iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
|
|
(unsigned char *)hdr);
|
|
return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
|
|
}
|
|
|
|
if (cmd->se_cmd.se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
|
|
struct cxgbit_cmd *ccmd = iscsit_priv_cmd(cmd);
|
|
struct skb_shared_info *ssi = skb_shinfo(csk->skb);
|
|
skb_frag_t *dfrag = &ssi->frags[pdu_cb->dfrag_idx];
|
|
|
|
sg_init_table(&ccmd->sg, 1);
|
|
sg_set_page(&ccmd->sg, skb_frag_page(dfrag),
|
|
skb_frag_size(dfrag), skb_frag_off(dfrag));
|
|
get_page(skb_frag_page(dfrag));
|
|
|
|
cmd->se_cmd.t_data_sg = &ccmd->sg;
|
|
cmd->se_cmd.t_data_nents = 1;
|
|
|
|
ccmd->release = true;
|
|
} else {
|
|
struct scatterlist *sg = &cmd->se_cmd.t_data_sg[0];
|
|
u32 sg_nents = max(1UL, DIV_ROUND_UP(pdu_cb->dlen, PAGE_SIZE));
|
|
|
|
cxgbit_skb_copy_to_sg(csk->skb, sg, sg_nents, 0);
|
|
}
|
|
|
|
cmd->write_data_done += pdu_cb->dlen;
|
|
|
|
if (cmd->write_data_done == cmd->se_cmd.data_length) {
|
|
spin_lock_bh(&cmd->istate_lock);
|
|
cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
|
|
cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
|
|
spin_unlock_bh(&cmd->istate_lock);
|
|
}
|
|
|
|
return IMMEDIATE_DATA_NORMAL_OPERATION;
|
|
}
|
|
|
|
static int
|
|
cxgbit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
|
|
bool dump_payload)
|
|
{
|
|
struct iscsi_conn *conn = cmd->conn;
|
|
int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
|
|
/*
|
|
* Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
|
|
*/
|
|
if (dump_payload)
|
|
goto after_immediate_data;
|
|
|
|
immed_ret = cxgbit_handle_immediate_data(cmd, hdr,
|
|
cmd->first_burst_len);
|
|
after_immediate_data:
|
|
if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
|
|
/*
|
|
* A PDU/CmdSN carrying Immediate Data passed
|
|
* DataCRC, check against ExpCmdSN/MaxCmdSN if
|
|
* Immediate Bit is not set.
|
|
*/
|
|
cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
|
|
(unsigned char *)hdr,
|
|
hdr->cmdsn);
|
|
if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
|
|
return -1;
|
|
|
|
if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
|
|
target_put_sess_cmd(&cmd->se_cmd);
|
|
return 0;
|
|
} else if (cmd->unsolicited_data) {
|
|
iscsit_set_unsolicited_dataout(cmd);
|
|
}
|
|
|
|
} else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
|
|
/*
|
|
* Immediate Data failed DataCRC and ERL>=1,
|
|
* silently drop this PDU and let the initiator
|
|
* plug the CmdSN gap.
|
|
*
|
|
* FIXME: Send Unsolicited NOPIN with reserved
|
|
* TTT here to help the initiator figure out
|
|
* the missing CmdSN, although they should be
|
|
* intelligent enough to determine the missing
|
|
* CmdSN and issue a retry to plug the sequence.
|
|
*/
|
|
cmd->i_state = ISTATE_REMOVE;
|
|
iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
|
|
} else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cxgbit_handle_scsi_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)pdu_cb->hdr;
|
|
int rc;
|
|
bool dump_payload = false;
|
|
|
|
rc = iscsit_setup_scsi_cmd(conn, cmd, (unsigned char *)hdr);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (pdu_cb->dlen && (pdu_cb->dlen == cmd->se_cmd.data_length) &&
|
|
(pdu_cb->nr_dfrags == 1))
|
|
cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
|
|
|
|
rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
|
|
if (rc < 0)
|
|
return 0;
|
|
else if (rc > 0)
|
|
dump_payload = true;
|
|
|
|
if (!pdu_cb->dlen)
|
|
return 0;
|
|
|
|
return cxgbit_get_immediate_data(cmd, hdr, dump_payload);
|
|
}
|
|
|
|
static int cxgbit_handle_iscsi_dataout(struct cxgbit_sock *csk)
|
|
{
|
|
struct scatterlist *sg_start;
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_cmd *cmd = NULL;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_data *hdr = (struct iscsi_data *)pdu_cb->hdr;
|
|
u32 data_offset = be32_to_cpu(hdr->offset);
|
|
u32 data_len = pdu_cb->dlen;
|
|
int rc, sg_nents, sg_off;
|
|
bool dcrc_err = false;
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DDP_CMP) {
|
|
u32 offset = be32_to_cpu(hdr->offset);
|
|
u32 ddp_data_len;
|
|
u32 payload_length = ntoh24(hdr->dlength);
|
|
bool success = false;
|
|
|
|
cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 0);
|
|
if (!cmd)
|
|
return 0;
|
|
|
|
ddp_data_len = offset - cmd->write_data_done;
|
|
atomic_long_add(ddp_data_len, &conn->sess->rx_data_octets);
|
|
|
|
cmd->write_data_done = offset;
|
|
cmd->next_burst_len = ddp_data_len;
|
|
cmd->data_sn = be32_to_cpu(hdr->datasn);
|
|
|
|
rc = __iscsit_check_dataout_hdr(conn, (unsigned char *)hdr,
|
|
cmd, payload_length, &success);
|
|
if (rc < 0)
|
|
return rc;
|
|
else if (!success)
|
|
return 0;
|
|
} else {
|
|
rc = iscsit_check_dataout_hdr(conn, (unsigned char *)hdr, &cmd);
|
|
if (rc < 0)
|
|
return rc;
|
|
else if (!cmd)
|
|
return 0;
|
|
}
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
|
|
pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
|
|
" DataSN: 0x%08x\n",
|
|
hdr->itt, hdr->offset, data_len,
|
|
hdr->datasn);
|
|
|
|
dcrc_err = true;
|
|
goto check_payload;
|
|
}
|
|
|
|
pr_debug("DataOut data_len: %u, "
|
|
"write_data_done: %u, data_length: %u\n",
|
|
data_len, cmd->write_data_done,
|
|
cmd->se_cmd.data_length);
|
|
|
|
if (!(pdu_cb->flags & PDUCBF_RX_DATA_DDPD)) {
|
|
u32 skip = data_offset % PAGE_SIZE;
|
|
|
|
sg_off = data_offset / PAGE_SIZE;
|
|
sg_start = &cmd->se_cmd.t_data_sg[sg_off];
|
|
sg_nents = max(1UL, DIV_ROUND_UP(skip + data_len, PAGE_SIZE));
|
|
|
|
cxgbit_skb_copy_to_sg(csk->skb, sg_start, sg_nents, skip);
|
|
}
|
|
|
|
check_payload:
|
|
|
|
rc = iscsit_check_dataout_payload(cmd, hdr, dcrc_err);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cxgbit_handle_nop_out(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_nopout *hdr = (struct iscsi_nopout *)pdu_cb->hdr;
|
|
unsigned char *ping_data = NULL;
|
|
u32 payload_length = pdu_cb->dlen;
|
|
int ret;
|
|
|
|
ret = iscsit_setup_nop_out(conn, cmd, hdr);
|
|
if (ret < 0)
|
|
return 0;
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
|
|
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
|
|
pr_err("Unable to recover from"
|
|
" NOPOUT Ping DataCRC failure while in"
|
|
" ERL=0.\n");
|
|
ret = -1;
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* drop this PDU and let the
|
|
* initiator plug the CmdSN gap.
|
|
*/
|
|
pr_info("Dropping NOPOUT"
|
|
" Command CmdSN: 0x%08x due to"
|
|
" DataCRC error.\n", hdr->cmdsn);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle NOP-OUT payload for traditional iSCSI sockets
|
|
*/
|
|
if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
|
|
ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
|
|
if (!ping_data) {
|
|
pr_err("Unable to allocate memory for"
|
|
" NOPOUT ping data.\n");
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
skb_copy_bits(csk->skb, pdu_cb->doffset,
|
|
ping_data, payload_length);
|
|
|
|
ping_data[payload_length] = '\0';
|
|
/*
|
|
* Attach ping data to struct iscsi_cmd->buf_ptr.
|
|
*/
|
|
cmd->buf_ptr = ping_data;
|
|
cmd->buf_ptr_size = payload_length;
|
|
|
|
pr_debug("Got %u bytes of NOPOUT ping"
|
|
" data.\n", payload_length);
|
|
pr_debug("Ping Data: \"%s\"\n", ping_data);
|
|
}
|
|
|
|
return iscsit_process_nop_out(conn, cmd, hdr);
|
|
out:
|
|
if (cmd)
|
|
iscsit_free_cmd(cmd, false);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
cxgbit_handle_text_cmd(struct cxgbit_sock *csk, struct iscsi_cmd *cmd)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_text *hdr = (struct iscsi_text *)pdu_cb->hdr;
|
|
u32 payload_length = pdu_cb->dlen;
|
|
int rc;
|
|
unsigned char *text_in = NULL;
|
|
|
|
rc = iscsit_setup_text_cmd(conn, cmd, hdr);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DCRC_ERR) {
|
|
if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
|
|
pr_err("Unable to recover from"
|
|
" Text Data digest failure while in"
|
|
" ERL=0.\n");
|
|
goto reject;
|
|
} else {
|
|
/*
|
|
* drop this PDU and let the
|
|
* initiator plug the CmdSN gap.
|
|
*/
|
|
pr_info("Dropping Text"
|
|
" Command CmdSN: 0x%08x due to"
|
|
" DataCRC error.\n", hdr->cmdsn);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (payload_length) {
|
|
text_in = kzalloc(payload_length, GFP_KERNEL);
|
|
if (!text_in) {
|
|
pr_err("Unable to allocate text_in of payload_length: %u\n",
|
|
payload_length);
|
|
return -ENOMEM;
|
|
}
|
|
skb_copy_bits(csk->skb, pdu_cb->doffset,
|
|
text_in, payload_length);
|
|
|
|
text_in[payload_length - 1] = '\0';
|
|
|
|
cmd->text_in_ptr = text_in;
|
|
}
|
|
|
|
return iscsit_process_text_cmd(conn, cmd, hdr);
|
|
|
|
reject:
|
|
return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
|
|
pdu_cb->hdr);
|
|
}
|
|
|
|
static int cxgbit_target_rx_opcode(struct cxgbit_sock *csk)
|
|
{
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_hdr *hdr = (struct iscsi_hdr *)pdu_cb->hdr;
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_cmd *cmd = NULL;
|
|
u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
|
|
int ret = -EINVAL;
|
|
|
|
switch (opcode) {
|
|
case ISCSI_OP_SCSI_CMD:
|
|
cmd = cxgbit_allocate_cmd(csk);
|
|
if (!cmd)
|
|
goto reject;
|
|
|
|
ret = cxgbit_handle_scsi_cmd(csk, cmd);
|
|
break;
|
|
case ISCSI_OP_SCSI_DATA_OUT:
|
|
ret = cxgbit_handle_iscsi_dataout(csk);
|
|
break;
|
|
case ISCSI_OP_NOOP_OUT:
|
|
if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
|
|
cmd = cxgbit_allocate_cmd(csk);
|
|
if (!cmd)
|
|
goto reject;
|
|
}
|
|
|
|
ret = cxgbit_handle_nop_out(csk, cmd);
|
|
break;
|
|
case ISCSI_OP_SCSI_TMFUNC:
|
|
cmd = cxgbit_allocate_cmd(csk);
|
|
if (!cmd)
|
|
goto reject;
|
|
|
|
ret = iscsit_handle_task_mgt_cmd(conn, cmd,
|
|
(unsigned char *)hdr);
|
|
break;
|
|
case ISCSI_OP_TEXT:
|
|
if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
|
|
cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
|
|
if (!cmd)
|
|
goto reject;
|
|
} else {
|
|
cmd = cxgbit_allocate_cmd(csk);
|
|
if (!cmd)
|
|
goto reject;
|
|
}
|
|
|
|
ret = cxgbit_handle_text_cmd(csk, cmd);
|
|
break;
|
|
case ISCSI_OP_LOGOUT:
|
|
cmd = cxgbit_allocate_cmd(csk);
|
|
if (!cmd)
|
|
goto reject;
|
|
|
|
ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
|
|
if (ret > 0)
|
|
wait_for_completion_timeout(&conn->conn_logout_comp,
|
|
SECONDS_FOR_LOGOUT_COMP
|
|
* HZ);
|
|
break;
|
|
case ISCSI_OP_SNACK:
|
|
ret = iscsit_handle_snack(conn, (unsigned char *)hdr);
|
|
break;
|
|
default:
|
|
pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
|
|
dump_stack();
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
|
|
reject:
|
|
return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
|
|
(unsigned char *)hdr);
|
|
return ret;
|
|
}
|
|
|
|
static int cxgbit_rx_opcode(struct cxgbit_sock *csk)
|
|
{
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_hdr *hdr = pdu_cb->hdr;
|
|
u8 opcode;
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_HCRC_ERR) {
|
|
atomic_long_inc(&conn->sess->conn_digest_errors);
|
|
goto transport_err;
|
|
}
|
|
|
|
if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
|
|
goto transport_err;
|
|
|
|
opcode = hdr->opcode & ISCSI_OPCODE_MASK;
|
|
|
|
if (conn->sess->sess_ops->SessionType &&
|
|
((!(opcode & ISCSI_OP_TEXT)) ||
|
|
(!(opcode & ISCSI_OP_LOGOUT)))) {
|
|
pr_err("Received illegal iSCSI Opcode: 0x%02x"
|
|
" while in Discovery Session, rejecting.\n", opcode);
|
|
iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
|
|
(unsigned char *)hdr);
|
|
goto transport_err;
|
|
}
|
|
|
|
if (cxgbit_target_rx_opcode(csk) < 0)
|
|
goto transport_err;
|
|
|
|
return 0;
|
|
|
|
transport_err:
|
|
return -1;
|
|
}
|
|
|
|
static int cxgbit_rx_login_pdu(struct cxgbit_sock *csk)
|
|
{
|
|
struct iscsi_conn *conn = csk->conn;
|
|
struct iscsi_login *login = conn->login;
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_rx_pdu_cb(csk->skb);
|
|
struct iscsi_login_req *login_req;
|
|
|
|
login_req = (struct iscsi_login_req *)login->req;
|
|
memcpy(login_req, pdu_cb->hdr, sizeof(*login_req));
|
|
|
|
pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
|
|
" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
|
|
login_req->flags, login_req->itt, login_req->cmdsn,
|
|
login_req->exp_statsn, login_req->cid, pdu_cb->dlen);
|
|
/*
|
|
* Setup the initial iscsi_login values from the leading
|
|
* login request PDU.
|
|
*/
|
|
if (login->first_request) {
|
|
login_req = (struct iscsi_login_req *)login->req;
|
|
login->leading_connection = (!login_req->tsih) ? 1 : 0;
|
|
login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
|
|
login_req->flags);
|
|
login->version_min = login_req->min_version;
|
|
login->version_max = login_req->max_version;
|
|
memcpy(login->isid, login_req->isid, 6);
|
|
login->cmd_sn = be32_to_cpu(login_req->cmdsn);
|
|
login->init_task_tag = login_req->itt;
|
|
login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
|
|
login->cid = be16_to_cpu(login_req->cid);
|
|
login->tsih = be16_to_cpu(login_req->tsih);
|
|
}
|
|
|
|
if (iscsi_target_check_login_request(conn, login) < 0)
|
|
return -1;
|
|
|
|
memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
|
|
skb_copy_bits(csk->skb, pdu_cb->doffset, login->req_buf, pdu_cb->dlen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cxgbit_process_iscsi_pdu(struct cxgbit_sock *csk, struct sk_buff *skb, int idx)
|
|
{
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, idx);
|
|
int ret;
|
|
|
|
cxgbit_rx_pdu_cb(skb) = pdu_cb;
|
|
|
|
csk->skb = skb;
|
|
|
|
if (!test_bit(CSK_LOGIN_DONE, &csk->com.flags)) {
|
|
ret = cxgbit_rx_login_pdu(csk);
|
|
set_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
|
|
} else {
|
|
ret = cxgbit_rx_opcode(csk);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void cxgbit_lro_skb_dump(struct sk_buff *skb)
|
|
{
|
|
struct skb_shared_info *ssi = skb_shinfo(skb);
|
|
struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
|
|
u8 i;
|
|
|
|
pr_info("skb 0x%p, head 0x%p, 0x%p, len %u,%u, frags %u.\n",
|
|
skb, skb->head, skb->data, skb->len, skb->data_len,
|
|
ssi->nr_frags);
|
|
pr_info("skb 0x%p, lro_cb, csk 0x%p, pdu %u, %u.\n",
|
|
skb, lro_cb->csk, lro_cb->pdu_idx, lro_cb->pdu_totallen);
|
|
|
|
for (i = 0; i < lro_cb->pdu_idx; i++, pdu_cb++)
|
|
pr_info("skb 0x%p, pdu %d, %u, f 0x%x, seq 0x%x, dcrc 0x%x, "
|
|
"frags %u.\n",
|
|
skb, i, pdu_cb->pdulen, pdu_cb->flags, pdu_cb->seq,
|
|
pdu_cb->ddigest, pdu_cb->frags);
|
|
for (i = 0; i < ssi->nr_frags; i++)
|
|
pr_info("skb 0x%p, frag %d, off %u, sz %u.\n",
|
|
skb, i, skb_frag_off(&ssi->frags[i]),
|
|
skb_frag_size(&ssi->frags[i]));
|
|
}
|
|
|
|
static void cxgbit_lro_hskb_reset(struct cxgbit_sock *csk)
|
|
{
|
|
struct sk_buff *skb = csk->lro_hskb;
|
|
struct skb_shared_info *ssi = skb_shinfo(skb);
|
|
u8 i;
|
|
|
|
memset(skb->data, 0, LRO_SKB_MIN_HEADROOM);
|
|
for (i = 0; i < ssi->nr_frags; i++)
|
|
put_page(skb_frag_page(&ssi->frags[i]));
|
|
ssi->nr_frags = 0;
|
|
skb->data_len = 0;
|
|
skb->truesize -= skb->len;
|
|
skb->len = 0;
|
|
}
|
|
|
|
static void
|
|
cxgbit_lro_skb_merge(struct cxgbit_sock *csk, struct sk_buff *skb, u8 pdu_idx)
|
|
{
|
|
struct sk_buff *hskb = csk->lro_hskb;
|
|
struct cxgbit_lro_pdu_cb *hpdu_cb = cxgbit_skb_lro_pdu_cb(hskb, 0);
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, pdu_idx);
|
|
struct skb_shared_info *hssi = skb_shinfo(hskb);
|
|
struct skb_shared_info *ssi = skb_shinfo(skb);
|
|
unsigned int len = 0;
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_HDR) {
|
|
u8 hfrag_idx = hssi->nr_frags;
|
|
|
|
hpdu_cb->flags |= pdu_cb->flags;
|
|
hpdu_cb->seq = pdu_cb->seq;
|
|
hpdu_cb->hdr = pdu_cb->hdr;
|
|
hpdu_cb->hlen = pdu_cb->hlen;
|
|
|
|
memcpy(&hssi->frags[hfrag_idx], &ssi->frags[pdu_cb->hfrag_idx],
|
|
sizeof(skb_frag_t));
|
|
|
|
get_page(skb_frag_page(&hssi->frags[hfrag_idx]));
|
|
hssi->nr_frags++;
|
|
hpdu_cb->frags++;
|
|
hpdu_cb->hfrag_idx = hfrag_idx;
|
|
|
|
len = skb_frag_size(&hssi->frags[hfrag_idx]);
|
|
hskb->len += len;
|
|
hskb->data_len += len;
|
|
hskb->truesize += len;
|
|
}
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_DATA) {
|
|
u8 dfrag_idx = hssi->nr_frags, i;
|
|
|
|
hpdu_cb->flags |= pdu_cb->flags;
|
|
hpdu_cb->dfrag_idx = dfrag_idx;
|
|
|
|
len = 0;
|
|
for (i = 0; i < pdu_cb->nr_dfrags; dfrag_idx++, i++) {
|
|
memcpy(&hssi->frags[dfrag_idx],
|
|
&ssi->frags[pdu_cb->dfrag_idx + i],
|
|
sizeof(skb_frag_t));
|
|
|
|
get_page(skb_frag_page(&hssi->frags[dfrag_idx]));
|
|
|
|
len += skb_frag_size(&hssi->frags[dfrag_idx]);
|
|
|
|
hssi->nr_frags++;
|
|
hpdu_cb->frags++;
|
|
}
|
|
|
|
hpdu_cb->dlen = pdu_cb->dlen;
|
|
hpdu_cb->doffset = hpdu_cb->hlen;
|
|
hpdu_cb->nr_dfrags = pdu_cb->nr_dfrags;
|
|
hskb->len += len;
|
|
hskb->data_len += len;
|
|
hskb->truesize += len;
|
|
}
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_STATUS) {
|
|
hpdu_cb->flags |= pdu_cb->flags;
|
|
|
|
if (hpdu_cb->flags & PDUCBF_RX_DATA)
|
|
hpdu_cb->flags &= ~PDUCBF_RX_DATA_DDPD;
|
|
|
|
hpdu_cb->ddigest = pdu_cb->ddigest;
|
|
hpdu_cb->pdulen = pdu_cb->pdulen;
|
|
}
|
|
}
|
|
|
|
static int cxgbit_process_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
|
|
{
|
|
struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
|
|
u8 pdu_idx = 0, last_idx = 0;
|
|
int ret = 0;
|
|
|
|
if (!pdu_cb->complete) {
|
|
cxgbit_lro_skb_merge(csk, skb, 0);
|
|
|
|
if (pdu_cb->flags & PDUCBF_RX_STATUS) {
|
|
struct sk_buff *hskb = csk->lro_hskb;
|
|
|
|
ret = cxgbit_process_iscsi_pdu(csk, hskb, 0);
|
|
|
|
cxgbit_lro_hskb_reset(csk);
|
|
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
pdu_idx = 1;
|
|
}
|
|
|
|
if (lro_cb->pdu_idx)
|
|
last_idx = lro_cb->pdu_idx - 1;
|
|
|
|
for (; pdu_idx <= last_idx; pdu_idx++) {
|
|
ret = cxgbit_process_iscsi_pdu(csk, skb, pdu_idx);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
if ((!lro_cb->complete) && lro_cb->pdu_idx)
|
|
cxgbit_lro_skb_merge(csk, skb, lro_cb->pdu_idx);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int cxgbit_rx_lro_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
|
|
{
|
|
struct cxgbit_lro_cb *lro_cb = cxgbit_skb_lro_cb(skb);
|
|
struct cxgbit_lro_pdu_cb *pdu_cb = cxgbit_skb_lro_pdu_cb(skb, 0);
|
|
int ret = -1;
|
|
|
|
if ((pdu_cb->flags & PDUCBF_RX_HDR) &&
|
|
(pdu_cb->seq != csk->rcv_nxt)) {
|
|
pr_info("csk 0x%p, tid 0x%x, seq 0x%x != 0x%x.\n",
|
|
csk, csk->tid, pdu_cb->seq, csk->rcv_nxt);
|
|
cxgbit_lro_skb_dump(skb);
|
|
return ret;
|
|
}
|
|
|
|
csk->rcv_nxt += lro_cb->pdu_totallen;
|
|
|
|
ret = cxgbit_process_lro_skb(csk, skb);
|
|
|
|
csk->rx_credits += lro_cb->pdu_totallen;
|
|
|
|
if (csk->rx_credits >= (csk->rcv_win / 4))
|
|
cxgbit_rx_data_ack(csk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int cxgbit_rx_skb(struct cxgbit_sock *csk, struct sk_buff *skb)
|
|
{
|
|
struct cxgb4_lld_info *lldi = &csk->com.cdev->lldi;
|
|
int ret = -1;
|
|
|
|
if (likely(cxgbit_skcb_flags(skb) & SKCBF_RX_LRO)) {
|
|
if (is_t5(lldi->adapter_type))
|
|
ret = cxgbit_rx_lro_skb(csk, skb);
|
|
else
|
|
ret = cxgbit_process_lro_skb(csk, skb);
|
|
}
|
|
|
|
__kfree_skb(skb);
|
|
return ret;
|
|
}
|
|
|
|
static bool cxgbit_rxq_len(struct cxgbit_sock *csk, struct sk_buff_head *rxq)
|
|
{
|
|
spin_lock_bh(&csk->rxq.lock);
|
|
if (skb_queue_len(&csk->rxq)) {
|
|
skb_queue_splice_init(&csk->rxq, rxq);
|
|
spin_unlock_bh(&csk->rxq.lock);
|
|
return true;
|
|
}
|
|
spin_unlock_bh(&csk->rxq.lock);
|
|
return false;
|
|
}
|
|
|
|
static int cxgbit_wait_rxq(struct cxgbit_sock *csk)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct sk_buff_head rxq;
|
|
|
|
skb_queue_head_init(&rxq);
|
|
|
|
wait_event_interruptible(csk->waitq, cxgbit_rxq_len(csk, &rxq));
|
|
|
|
if (signal_pending(current))
|
|
goto out;
|
|
|
|
while ((skb = __skb_dequeue(&rxq))) {
|
|
if (cxgbit_rx_skb(csk, skb))
|
|
goto out;
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
__skb_queue_purge(&rxq);
|
|
return -1;
|
|
}
|
|
|
|
int cxgbit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
int ret = -1;
|
|
|
|
while (!test_and_clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags)) {
|
|
ret = cxgbit_wait_rxq(csk);
|
|
if (ret) {
|
|
clear_bit(CSK_LOGIN_PDU_DONE, &csk->com.flags);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void cxgbit_get_rx_pdu(struct iscsi_conn *conn)
|
|
{
|
|
struct cxgbit_sock *csk = conn->context;
|
|
|
|
while (!kthread_should_stop()) {
|
|
iscsit_thread_check_cpumask(conn, current, 0);
|
|
if (cxgbit_wait_rxq(csk))
|
|
return;
|
|
}
|
|
}
|