1 files changed, 0 insertions, 495 deletions

diff --git a/drivers/scsi/cxgb3i/cxgb3i_pdu.c b/drivers/scsi/cxgb3i/cxgb3i_pdu.c
deleted file mode 100644
index dc5e3e7..0000000
--- a/drivers/scsi/cxgb3i/cxgb3i_pdu.c
+++ /dev/null
@@ -1,495 +0,0 @@
-/*
- * cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- * Copyright (c) 2008 Mike Christie
- * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/crypto.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_host.h>
-
-#include "cxgb3i.h"
-#include "cxgb3i_pdu.h"
-
-#ifdef __DEBUG_CXGB3I_RX__
-#define cxgb3i_rx_debug		cxgb3i_log_debug
-#else
-#define cxgb3i_rx_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_CXGB3I_TX__
-#define cxgb3i_tx_debug		cxgb3i_log_debug
-#else
-#define cxgb3i_tx_debug(fmt...)
-#endif
-
-/* always allocate rooms for AHS */
-#define SKB_TX_PDU_HEADER_LEN	\
-	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
-static unsigned int skb_extra_headroom;
-static struct page *pad_page;
-
-/*
- * pdu receive, interact with libiscsi_tcp
- */
-static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
-			       unsigned int offset, int offloaded)
-{
-	int status = 0;
-	int bytes_read;
-
-	bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
-	switch (status) {
-	case ISCSI_TCP_CONN_ERR:
-		return -EIO;
-	case ISCSI_TCP_SUSPENDED:
-		/* no transfer - just have caller flush queue */
-		return bytes_read;
-	case ISCSI_TCP_SKB_DONE:
-		/*
-		 * pdus should always fit in the skb and we should get
-		 * segment done notifcation.
-		 */
-		iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
-		return -EFAULT;
-	case ISCSI_TCP_SEGMENT_DONE:
-		return bytes_read;
-	default:
-		iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
-				  "status %d\n", status);
-		return -EINVAL;
-	}
-}
-
-static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
-				    struct sk_buff *skb)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	bool offloaded = 0;
-	unsigned int offset;
-	int rc;
-
-	cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
-			conn, skb, skb->len, skb_ulp_mode(skb));
-
-	if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
-		return -EIO;
-	}
-
-	if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
-		return -EIO;
-	}
-
-	if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
-		return -EIO;
-	}
-
-	/* iscsi hdr */
-	rc = read_pdu_skb(conn, skb, 0, 0);
-	if (rc <= 0)
-		return rc;
-
-	if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
-		return 0;
-
-	offset = rc;
-	if (conn->hdrdgst_en)
-		offset += ISCSI_DIGEST_SIZE;
-
-	/* iscsi data */
-	if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
-		cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
-				"itt 0x%x.\n",
-				skb,
-				tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
-				tcp_conn->in.datalen,
-				ntohl(tcp_conn->in.hdr->itt));
-		offloaded = 1;
-	} else {
-		cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
-				"itt 0x%x.\n",
-				skb,
-				tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
-				tcp_conn->in.datalen,
-				ntohl(tcp_conn->in.hdr->itt));
-		offset += sizeof(struct cpl_iscsi_hdr_norss);
-	}
-
-	rc = read_pdu_skb(conn, skb, offset, offloaded);
-	if (rc < 0)
-		return rc;
-	else
-		return 0;
-}
-
-/*
- * pdu transmit, interact with libiscsi_tcp
- */
-static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
-{
-	u8 submode = 0;
-
-	if (hcrc)
-		submode |= 1;
-	if (dcrc)
-		submode |= 2;
-	skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
-}
-
-void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
-{
-	struct cxgb3i_task_data *tdata = task->dd_data +
-					sizeof(struct iscsi_tcp_task);
-
-	/* never reached the xmit task callout */
-	if (tdata->skb)
-		__kfree_skb(tdata->skb);
-	memset(tdata, 0, sizeof(struct cxgb3i_task_data));
-
-	/* MNC - Do we need a check in case this is called but
-	 * cxgb3i_conn_alloc_pdu has never been called on the task */
-	cxgb3i_release_itt(task, task->hdr_itt);
-	iscsi_tcp_cleanup_task(task);
-}
-
-static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
-				unsigned int offset, unsigned int *off,
-				struct scatterlist **sgp)
-{
-	int i;
-	struct scatterlist *sg;
-
-	for_each_sg(sgl, sg, sgcnt, i) {
-		if (offset < sg->length) {
-			*off = offset;
-			*sgp = sg;
-			return 0;
-		}
-		offset -= sg->length;
-	}
-	return -EFAULT;
-}
-
-static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
-				unsigned int dlen, skb_frag_t *frags,
-				int frag_max)
-{
-	unsigned int datalen = dlen;
-	unsigned int sglen = sg->length - sgoffset;
-	struct page *page = sg_page(sg);
-	int i;
-
-	i = 0;
-	do {
-		unsigned int copy;
-
-		if (!sglen) {
-			sg = sg_next(sg);
-			if (!sg) {
-				cxgb3i_log_error("%s, sg NULL, len %u/%u.\n",
-						 __func__, datalen, dlen);
-				return -EINVAL;
-			}
-			sgoffset = 0;
-			sglen = sg->length;
-			page = sg_page(sg);
-
-		}
-		copy = min(datalen, sglen);
-		if (i && page == frags[i - 1].page &&
-		    sgoffset + sg->offset ==
-			frags[i - 1].page_offset + frags[i - 1].size) {
-			frags[i - 1].size += copy;
-		} else {
-			if (i >= frag_max) {
-				cxgb3i_log_error("%s, too many pages %u, "
-						 "dlen %u.\n", __func__,
-						 frag_max, dlen);
-				return -EINVAL;
-			}
-
-			frags[i].page = page;
-			frags[i].page_offset = sg->offset + sgoffset;
-			frags[i].size = copy;
-			i++;
-		}
-		datalen -= copy;
-		sgoffset += copy;
-		sglen -= copy;
-	} while (datalen);
-
-	return i;
-}
-
-int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
-{
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task);
-	struct scsi_cmnd *sc = task->sc;
-	int headroom = SKB_TX_PDU_HEADER_LEN;
-
-	tcp_task->dd_data = tdata;
-	task->hdr = NULL;
-
-	/* write command, need to send data pdus */
-	if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT ||
-	    (opcode == ISCSI_OP_SCSI_CMD &&
-	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
-		headroom += min(skb_extra_headroom, conn->max_xmit_dlength);
-
-	tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC);
-	if (!tdata->skb)
-		return -ENOMEM;
-	skb_reserve(tdata->skb, TX_HEADER_LEN);
-
-	cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
-			task, opcode, tdata->skb);
-
-	task->hdr = (struct iscsi_hdr *)tdata->skb->data;
-	task->hdr_max = SKB_TX_PDU_HEADER_LEN;
-
-	/* data_out uses scsi_cmd's itt */
-	if (opcode != ISCSI_OP_SCSI_DATA_OUT)
-		cxgb3i_reserve_itt(task, &task->hdr->itt);
-
-	return 0;
-}
-
-int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
-			      unsigned int count)
-{
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = tcp_task->dd_data;
-	struct sk_buff *skb = tdata->skb;
-	unsigned int datalen = count;
-	int i, padlen = iscsi_padding(count);
-	struct page *pg;
-
-	cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
-			task, task->sc, offset, count, skb);
-
-	skb_put(skb, task->hdr_len);
-	tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
-	if (!count)
-		return 0;
-
-	if (task->sc) {
-		struct scsi_data_buffer *sdb = scsi_out(task->sc);
-		struct scatterlist *sg = NULL;
-		int err;
-
-		tdata->offset = offset;
-		tdata->count = count;
-		err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents,
-					tdata->offset, &tdata->sgoffset, &sg);
-		if (err < 0) {
-			cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n",
-					sdb->table.nents, tdata->offset,
-					sdb->length);
-			return err;
-		}
-		err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
-					tdata->frags, MAX_PDU_FRAGS);
-		if (err < 0) {
-			cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n",
-					sdb->table.nents, tdata->offset,
-					tdata->count);
-			return err;
-		}
-		tdata->nr_frags = err;
-
-		if (tdata->nr_frags > MAX_SKB_FRAGS ||
-		    (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
-			char *dst = skb->data + task->hdr_len;
-			skb_frag_t *frag = tdata->frags;
-
-			/* data fits in the skb's headroom */
-			for (i = 0; i < tdata->nr_frags; i++, frag++) {
-				char *src = kmap_atomic(frag->page,
-							KM_SOFTIRQ0);
-
-				memcpy(dst, src+frag->page_offset, frag->size);
-				dst += frag->size;
-				kunmap_atomic(src, KM_SOFTIRQ0);
-			}
-			if (padlen) {
-				memset(dst, 0, padlen);
-				padlen = 0;
-			}
-			skb_put(skb, count + padlen);
-		} else {
-			/* data fit into frag_list */
-			for (i = 0; i < tdata->nr_frags; i++)
-				get_page(tdata->frags[i].page);
-
-			memcpy(skb_shinfo(skb)->frags, tdata->frags,
-				sizeof(skb_frag_t) * tdata->nr_frags);
-			skb_shinfo(skb)->nr_frags = tdata->nr_frags;
-			skb->len += count;
-			skb->data_len += count;
-			skb->truesize += count;
-		}
-
-	} else {
-		pg = virt_to_page(task->data);
-
-		get_page(pg);
-		skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
-					count);
-		skb->len += count;
-		skb->data_len += count;
-		skb->truesize += count;
-	}
-
-	if (padlen) {
-		i = skb_shinfo(skb)->nr_frags;
-		get_page(pad_page);
-		skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0,
-				 padlen);
-
-		skb->data_len += padlen;
-		skb->truesize += padlen;
-		skb->len += padlen;
-	}
-
-	return 0;
-}
-
-int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
-{
-	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = tcp_task->dd_data;
-	struct sk_buff *skb = tdata->skb;
-	unsigned int datalen;
-	int err;
-
-	if (!skb)
-		return 0;
-
-	datalen = skb->data_len;
-	tdata->skb = NULL;
-	err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
-	if (err > 0) {
-		int pdulen = err;
-
-		cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
-				task, skb, skb->len, skb->data_len, err);
-
-		if (task->conn->hdrdgst_en)
-			pdulen += ISCSI_DIGEST_SIZE;
-		if (datalen && task->conn->datadgst_en)
-			pdulen += ISCSI_DIGEST_SIZE;
-
-		task->conn->txdata_octets += pdulen;
-		return 0;
-	}
-
-	if (err == -EAGAIN || err == -ENOBUFS) {
-		/* reset skb to send when we are called again */
-		tdata->skb = skb;
-		return err;
-	}
-
-	kfree_skb(skb);
-	cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
-			task->itt, skb, skb->len, skb->data_len, err);
-	iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
-	iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
-	return err;
-}
-
-int cxgb3i_pdu_init(void)
-{
-	if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS))
-		skb_extra_headroom = SKB_TX_HEADROOM;
-	pad_page = alloc_page(GFP_KERNEL);
-	if (!pad_page)
-		return -ENOMEM;
-	memset(page_address(pad_page), 0, PAGE_SIZE);
-	return 0;
-}
-
-void cxgb3i_pdu_cleanup(void)
-{
-	if (pad_page) {
-		__free_page(pad_page);
-		pad_page = NULL;
-	}
-}
-
-void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb;
-	unsigned int read = 0;
-	struct iscsi_conn *conn = c3cn->user_data;
-	int err = 0;
-
-	cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
-
-	read_lock(&c3cn->callback_lock);
-	if (unlikely(!conn || conn->suspend_rx)) {
-		cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
-				conn, conn ? conn->id : 0xFF,
-				conn ? conn->suspend_rx : 0xFF);
-		read_unlock(&c3cn->callback_lock);
-		return;
-	}
-	skb = skb_peek(&c3cn->receive_queue);
-	while (!err && skb) {
-		__skb_unlink(skb, &c3cn->receive_queue);
-		read += skb_rx_pdulen(skb);
-		cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n",
-				conn, c3cn, skb, skb_rx_pdulen(skb));
-		err = cxgb3i_conn_read_pdu_skb(conn, skb);
-		__kfree_skb(skb);
-		skb = skb_peek(&c3cn->receive_queue);
-	}
-	read_unlock(&c3cn->callback_lock);
-	c3cn->copied_seq += read;
-	cxgb3i_c3cn_rx_credits(c3cn, read);
-	conn->rxdata_octets += read;
-
-	if (err) {
-		cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err);
-		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-	}
-}
-
-void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
-{
-	struct iscsi_conn *conn = c3cn->user_data;
-
-	cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
-	if (conn) {
-		cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
-		iscsi_conn_queue_work(conn);
-	}
-}
-
-void cxgb3i_conn_closing(struct s3_conn *c3cn)
-{
-	struct iscsi_conn *conn;
-
-	read_lock(&c3cn->callback_lock);
-	conn = c3cn->user_data;
-	if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
-		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-	read_unlock(&c3cn->callback_lock);
-}